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Breast cancer patients have high serum reactive oxygen species (ROS) levels, which exert toxicity on the ovary. However, it is still unclear whether tumor-derived ROS play a role in endometrial development and function in breast cancer. Breast cancer patients and healthy controls were recruited and endometrial thickness was measured by transvaginal ultrasound (TVUS). Xenograft tumors of the breast cancer cell line MDA-MB-231 in a female BALB/c nude mice model were established, and the therapeutic mechanism of vitamin C (VC) was investigated on uterine pathology in vivo and the contribution of co-culture of breast cancer cell and endometrial epithelial cell on this process was examined in vitro. Median thickness in endometria was lower in breast cancer patients and tumor-bearing mice compared to controls. A gene signature of uteri in tumor-bearing mice demonstrated differential expression of genes (DEGs) regulating extracellular matrix (ECM) and epithelial-mesenchymal transition (EMT), and activation of TGF-β and MAPK signaling pathways. In addition, ROS, EMT- and ECM-related protein levels were enhanced in uteri in tumor-bearing mice, as well as in Ishikawa cells which were co-cultured with MDA-MB-231 cells compared to controls. Supplementation with VC reduced endometrial damage, inhibited the EMT process and collagen deposition, and maintained better histologic architecture of uteri in tumor-bearing mice via inactivation of the TGF-β1/p38MAPK pathway. In women with breast cancer oxidative stress in the endometrium results in a fibrotic response as a consequence of EMT. VC could alleviate endometrial fibrosis via TGF-β1/p38MAPK pathway and provide new predictive and therapeutic targets for fertility preservation in younger breast cancer patients., (© 2024 Federation of American Societies for Experimental Biology.)

Objective: The purpose of this study was to evaluate the relationship of thin endometrial thickness (EMT) on the maternal and child health outcome of frozen-thawed embryo transfer (FET) cycles with singletons., Methods: The retrospective cohort study included 1,771 live singleton deliveries, with 273 in the thin endometrium group (EMT ≤ 7.5 mm) and 1,498 in the control group (EMT > 7.5 mm). Pregnancy, perinatal complications and neonatal outcomes were compared between the two groups., Results: Women in the thinner endometrium group had higher rates of preeclampsia (7.69% vs. 7.00%), placenta previa (4.39% vs. 2.43%), postpartum haemorrhage (15.38% vs. 11.42%) than the control groups, although they were not significantly different. Significant difference was observed in the rates of placental abruption (1.09% vs. 0.07%, P = 0.001), abnormal placental cord insertion (3.66% vs. 1.74%, P = 0.011), placental adherence (15.38% vs. 7.14%, P < 0.001) between the two groups. No significant difference could be found regarding preterm labour, macrosomia, Apgar ≤ 7, large for gestational age (LGA) and appropriate for gestational age (AGA), and singletons from the thinner endometrium group had a significantly lower birthweight than those from the controls. Then after adjusting for confounders, thinner endometrium was still statistically significantly associated with placental adherence, postpartum haemorrhage and low birthweight (LBW)., Conclusion: These findings highlight the important role of endometrial thickness in influencing perinatal and obstetric-neonatal outcomes in FET cycles. The study contributes to the growing body of evidence supporting the clinical relevance of endometrial thickness in FET cycles and underscores the need for close monitoring and management of pregnancies in women with a thin endometrium. Future research should focus on elucidating the underlying mechanisms and identifying effective interventions to improve endometrial thickness and pregnancy outcomes in this patient population., Competing Interests: Declarations Ethics approval and consent to participate This study was conducted in accordance with the approved guidelines and approved by the Ethics Committee of Nanjing Maternity and Child Health Care Hospital (NJFY-2021KY-111). Informed patient consent was not required as the study was retrospective in nature and analyzed patient data anonymously. A statement from the Ethics Committee of Nanjing Maternity and Child Health Care Hospital waived the need for informed consent. Consent for publication Not applicable. Competing interests The authors declare no competing interests., (© 2024. The Author(s).)

Implantation is the key initial complex stage of pregnancy. Several factors are involved in implantation, but acute and controlled inflammation has been shown to play as a key role. On the other hand, the role of viral infections in directly infecting blastocyst and trophoblast and inducing chronic and uncontrolled inflammation and disrupting microRNAs expression can make this review strongly attractive and practical. We aim to provide an overview of viral infections as the potential etiology of unsuccessful implantation pathophysiology through alteration of the cellular and molecular endometrial microenvironment. Based on our search, this is the first review to discuss the role of inflammation associated with viral infection in implantation failure., Competing Interests: Declarations Ethics approval and consent to participate This study did not require ethical approval or patient consent. All analyses were performed according to previously published studies. Consent for publication Not applicable. Competing interests The authors declare no competing interests., (© 2024. The Author(s).)

Background: Polycystic ovary syndrome (PCOS) is a disease associated with inflammation and the follicular fluid of this patient contains proinflammatory cytokines. Abdominal obesity (AO) is also linked to increased levels of proinflammatory cytokines. This study investigated the induction of inflammation and decidualization of in vitro cultured endometrial stromal cells (ESCs) obtained from women with a normal uterus using the follicular fluid of PCOS and non-PCOS patients with or without abdominal obesity., Methods and Results: Forty patients under 35 years old, referred to the Royan Institute, were divided into four groups: PCOS with AO, PCOS without AO, non-PCOS with AO, and non-PCOS without AO. Follicular fluid samples were added to the culture medium of ESCs for each group. The rate of decidualization was measured by examining decidual markers. The study also investigated morphological changes in uterine endometrial cells, cell migration rates, and gene expression across all groups. We found that the non-PCOS group without AO had the highest decidualization potential and the highest expression of decidualization markers (P ≤ 0.05). Groups with an inflammatory phenotype of PCOS or abdominal obesity showed the highest expression of decidual pathway markers. The expression levels of inflammatory and proliferative markers in the PCOS group with AO were significantly higher than in the other groups (P ≤ 0.05)., Conclusions: The inflammatory profile present in the follicular fluid may trigger the decidualization process. Consequently, in the future, follicular fluid could be utilized as a natural supplement with human cells to promote decidualization and enhance endometrial receptivity in assisted reproductive technology., (© 2024. The Author(s), under exclusive licence to Springer Nature B.V.)

Background: Endometrial polyps are common benign lesions characterized by localized overgrowths of endometrial tissue within the uterine cavity. The etiology and pathogenesis of these polyps remain unclear. Human papillomavirus (HPV) infection, known for its association with various genital tract conditions, has been investigated concerning endometrial polyps, although research in this area is limited., Methods: A case-control study involving 62 premenopausal women was conducted, with endometrial polyp cases and control groups matched for age and BMI. Biopsy samples were collected for HPV testing using polymerase chain reaction (PCR). Clinical and demographic data were collected and analyzed for associations between HPV presence and endometrial polyps., Results: Results showed a higher prevalence of HPV (all types) in cases (4, 12.9%) compared to controls (1, 3.2%), with low-risk HPV being the most prevalent genotype detected and HPV 16 tested positive in one case diagnosed with polyp. While no significant association was found between HPV infection and the presence of endometrial polyps, the study suggests a potential role for HPV in their development. Interestingly, HPV presence in endometrial polyps was unrelated to histopathological features, patients' age, or BMI., Conclusion: This study provides insights into the potential involvement of HPV infection in the development of endometrial polyps. Despite no significant association found, the prevalence of HPV in these polyps suggests a possible contributory role. Further research with larger sample sizes and more robust methodologies is warranted to clarify this association and its clinical implications., (© 2024. The Author(s).)

Endometriosis is a debilitating and painful gynecological inflammatory disease affecting up to 15% of women and transgender men. Current treatments are ineffective for a substantial proportion of patients, underscoring the need for additional therapies with long-term benefits. Nociceptors release neuropeptides, such as calcitonin gene-related peptide (CGRP), which are known to shape immunity through neuroimmune communication. Given the comorbidity between endometriosis and migraine and the integral role of immune cells and inflammation in endometriosis, we investigated the role of CGRP-mediated neuroimmune communication in endometriosis. Using samples from eight patients with endometriosis and a nonsurgical mouse model of the disease, we found that mouse and human endometriosis lesions contain both CGRP and its coreceptor, receptor activity modifying protein 1 (RAMP1). In mice, nociceptor ablation reduced pain, monocyte recruitment, and lesion size, suggesting that nociceptor activation and neuropeptide release contribute to endometriosis lesion growth and pain. Mechanistically, CGRP changed the phenotype of macrophages to a pro-endometriosis phenotype. CGRP-stimulated macrophages demonstrated impaired efferocytosis and supported increased endometrial cell growth in a RAMP1-dependent manner. Treatment of lesion-bearing mice with US Food and Drug Administration-approved drugs that block CGRP-RAMP1 signaling reduced mechanical hyperalgesia, spontaneous pain, and lesion size. Together, our data demonstrated the effectiveness and underlying cellular mechanisms of nonhormonal and nonopioid CGRP/RAMP1 blockade in a mouse model of endometriosis, suggesting that targeting this axis may lead to clinical benefit for patients with endometriosis.

Leptin is not only the main regulator of energy balance, but also it affects the reproductive and immune systems. Leptin and its receptors are expressed in the endometrium and are actively involved in the embryo implantation. According to numerous studies, expression and level changes of leptin are associated with the inflammatory and autoimmune diseases, including endometriosis and chronic endometritis. Hyperplastic and inflammatory diseases of the uterus are accompanied by a violation of the receptivity of the endometrium due to the dysregulation of many factors involved in proliferation, vascularization and decidualization of cells. Activity of most of these factors is due to the leptin action, however, there are no studies of the direct effect of leptin in the pathogenesis of disorders of the endometrium in hyperplastic and inflammatory diseases.Thus, the purpose of this literature review was to describe the putative molecular mechanisms of the effect of leptin on the development of endometrial pathology.Literature search was carried out from 03/20/2023 to 05/11/2023 using scientific literature databases: NCBI PubMed, Google Scholar (foreign sources), Cyberleninka, Elibrary (domestic sources): references for the period 1995-2023 were analyzed. The following keywords were used for the search: leptin, endometrial dysfunction, endometrial receptivity, inflammation, pelvic inflammatory disease.

Objectives: To identify and analyse the different types and frequencies of morphological pattern in endometrial biopsies along with their associated diagnoses across different age groups., Methods: The cross-sectional study was conducted at the Histopathology Section of the Dow Diagnostics Reference and Research Laboratory, Dow University Health Sciences, Karachi, from October 2022 to October 2023. Data was obtained from pre-existing medical record of samples of endometrial biopsies. Open Epi sample size calculator is used for the estimation of sample size. The patients were divided into two aged-based groups; reproductive age ≤45 years in group 1 and postmenopause age ≥46 years in group 2. The histological diagnosis was made by a consultant histopathologist., Results: Of the 430 endometrial biopsies 222(51.6%) were in group 1 and 208(48.4%) were in group 2. In both groups, the most common finding was polyps 271(63%). Malignant changes were found in 12(5.7%) group 2 cases compared to 4(1.8%) group 1 cases., Conclusions: The most common endometrial lesion in both age groups was endometrial polyp. Malignant changes were seen more in postmenopausal women compared to those in the reproductive age group.

Thin endometrium (TE) has been widely recognized as a critical cause of infertility. However, the pathogenesis of TE remains unclear, and satisfactory treatment options are still urgently needed. Several animal models of TE have been developed, but the mouse model involving abdominal surgery and injection of 95% ethanol presents a formidable challenge due to the high mortality rate and risk of intrauterine adhesions if not performed correctly. Here, we describe a detailed protocol that produces reliable and reproducible TE with a very low mortality rate and minimal intrauterine adhesions by injecting 95% ethanol into the mouse uterus with varying infusion times. The results showed that all of the mice successfully developed TE with infusion times ranging from 1-3 min, characterized by a typical reduction in endometrial thickness and the number of glands, as well as excessive endometrial fibrosis. These findings suggest that this mouse model is suitable for studying thin endometrium and can serve as a platform for developing future TE treatments.

The aim of this study was to perform histopathological analysis of residual material in the cannula by endometrial sampling using a Carmen injector, and to compare the results. The study was conducted in the Department of Gynaecology, Mardin Training and Research Hospital, Artuklu/Mardin, Turkiye, from December 2021 to June 2022. The study group consisted of 104 patients who presented to the outpatient clinic with complaints of abnormal uterine bleeding. Endometrial curettage material was collected from all patients using a Carmen injector. The collected material was discharged into the pathology container (Group 1). Subsequently, the residual material remaining in the injector was placed in a separate pathology container (Group 2). Specimens were sent to the pathology laboratory with buffered formol. The pathological evaluation was performed by the same pathologist without revealing the patients' names. Comparative histopathological results of the patients in Group 1 and Group 2 were found to be fully compatible in 64.4% of the patients. In 35.6% of the patients, the histopathological results were different from each other between Group 1 and Group 2. Pathological results were different from each other in 21.2% of patients with incompatible pathology results. In Group 1, 16.7% of the patients were over-diagnosed, while 7.7% of the patients were over-diagnosed in Group 2. It would be beneficial to carefully remove the material remaining in the cannula and send it for pathological examination as it may affect the histopathological results. Key Words: Abnormal uterine bleeding, Probe curettage, Karman cannula, Histopathological evaluation.

Problem: What is the effect of SR-16234 (SR), a selective estrogen receptor (ER) modulator, on human endometriotic stromal cells (ESCs)?, Method of Study: Endometriotic tissues were obtained from 21 patients undergoing laparoscopic surgery for ovarian endometriomas (OEs). Normal eutopic endometrium during the luteal phase was obtained from 18 patients without endometriosis. ESCs isolated from OEs and normal eutopic endometrial stromal cells (NESCs) were cultured with SR and subsequently exposed to tumor necrosis factor (TNF)-α. After 48 h of incubation, the effect of SR on cell proliferation was evaluated by the WST-8 assay. The gene expressions of inflammatory and pain-related factors, including interleukin (IL)-6, IL-8, cyclooxygenase (COX)-2, transient receptor potential vanilloid (TRPV)1, ESR1, and ESR2, were evaluated by real-time RT-PCR. The phosphorylation of Inhibitor κBα (IκBα), extracellular signal-regulated kinase (ERK)1/2, and Protein Kinase B (AKT) were evaluated by western blot analysis. ILs, prostaglandin (PG) E2, and intranuclear p65 syntheses were assessed by ELISA., Results: SR treatment repressed TNF-α-induced proliferation by 20% in ESCs but not　NESCs. SR also reduced IL-6, IL-8, COX-2, TRPV1, ESR1, and ESR2 mRNA expressions and ILs protein, and PGE2 synthesis in ESCs, whereas in NESCs, only TRPV1 mRNA expression was decreased. SR suppressed TNF-α-induced phosphorylated IκBα levels by approximately 50%, and intranuclear p65 protein was reduced by 30% compared to addition of only TNF-α in ESCs. However, SR did not affect the phosphorylation of AKT and ERK1/2., Conclusions: SR appears to be a potential therapeutic agent for endometriosis by suppressing inflammatory and pain-related factor expressions by inhibiting the nuclear factor-kappa B pathway., (© 2024 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)

As a natural anti-inflammatory agent, it remains unclear whether the anti-inflammatory effects of VD3 (1,25 dihydroxyvitamin D3) are related to autophagy. This study investigates the impact of VD3 on inflammatory injury, autophagy, oxidative stress, and apoptosis in bovine endometrial epithelial cells (BEECs) and bovine endometrial organoids (BEOs). BEECs and BEOs were treated with LPS (1 μg/ml) for 24 hours, followed by treatment with LPS+VD3 (50 ng/ml) for 6 hours. Cell viability was assessed using the CCK8 assay. The expression levels of inflammatory factors (IL-1β, IL-6, TLR4, NF-κB), autophagy markers (Beclin-1, ATG5, ATG7, p62), and components of the PI3K/AKT/mTOR pathway (PI3K, AKT, and mTOR) were quantified using qRT-PCR and Western blot analyses. LC3B expression was detected by immunofluorescence, and the apoptosis rate was assessed using Annexin V. The results demonstrated a significant decrease in the expression levels of IL-1β, IL-6, TLR4, and NF-κB, along with a notable increase in the activity of CAT and SOD2 in the LPS+VD3 group (P < 0.05). The expression of autophagy-related factors was significantly increased, whereas the expression of signaling pathway factors was decreased in the LPS+VD3 group (P < 0.05). Additionally, apoptosis was significantly alleviated in the LPS+VD3 group (P < 0.05). Collectively, these findings indicate that VD3 modulates autophagy, attenuates oxidative stress and inflammatory damage in BEECs and BEOs, and inhibits LPS-induced apoptosis via the PI3K/AKT/mTOR pathway., Competing Interests: Declaration of Competing Interest The authors declare that they have no competing interests., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Aim: Endometrial changes in Japanese transgender men (TGM) on testosterone use remain elucidated. This study aims to present TGM with endometrial cancer and insights from a literature review of similar cases. Furthermore, we investigated the correlation between endometrial cancer and severe obesity in TGM who underwent gender-affirming surgery., Methods: Between July 2020 and April 2023, two groups were assessed: 2 TGM with endometrial cancer and 43 TGM without cancer who underwent gender-affirming surgery. A literature review for TGM with endometrial cancer was conducted. Clinical data were retrospectively collected, and histopathological evaluation of female genital organs was performed., Results: Two TGM with endometrial cancer and an additional four similar cases were identified through a literature search. These TGM had severe obesity (body mass index [BMI] ≥30 kg/m 2 ) and long-term testosterone use, indicating a possible link between endometrial cancer and these factors. Subsequently, we investigated the 43 TGM without cancer. We revealed 30% with obesity (BMI ≥25), only three cases of severe obesity (BMI ≥30), and a significant correlation between testosterone use duration and BMI in TGM without cancer. Histological examination revealed focal proliferative endometrium in 51% of cases and polycystic ovarian changes in 77%., Conclusions: Our observations suggest a potential link between severe obesity, prolonged testosterone use, and endometrial cancer in transgender men. Histological changes in the female genital tract highlighted frequent focal proliferative endometrium, even under testosterone therapy. Further research should focus on larger, multi-institutional studies to confirm these findings and establish endometrial cancer screening for Japanese TGM., (© 2024 Japan Society of Obstetrics and Gynecology.)

Endometriosis seriously affects 6-10 % of reproductive women globally and poses significant clinical challenges. The process of ectopic endometrial cell colonization shares similarities with cancer, and a dysfunctional immune microenvironment, characterized by non-classically polarized macrophages, plays a critical role in the progression of endometriosis. In this study, a targeted nano delivery system (BSA@Mif NPs) was developed using bovine serum albumin (BSA) as the carrier of mifepristone. The BSA@Mif NPs were utilized to selectively target M2 macrophages highly enriched in ectopic endometrial tissue via the SPARC receptor. This targeting strategy increases drug concentration at ectopic lesions while minimizing its distribution to normal tissue, thereby reducing side effects. In vitro studies demonstrated that BSA@Mif NPs not only enhanced the cellular uptake of M2-type macrophages and ectopic endometrial cells but also improved the cytotoxic effect of mifepristone on ectopic endometrial cells. Furthermore, the BSA@Mif NPs effectively induced immunogenic cell death (ICD) in ectopic endometrial cells and repolarized M2-type macrophages toward the M1 phenotype, resulting in a synergistic inhibition of ectopic endometrial cell growth. In vivo experiments revealed that BSA@Mif NPs exhibited significant therapeutic efficacy in endometriosis-bearing mice by increasing drug accumulation in the endometriotic tissues and modulating the immune microenvironment. This targeted biomimetic delivery strategy presents a promising approach for the development of endometriosis-specific therapies based on existing drugs. STATEMENT OF SIGNIFICANCE: Macrophages play an essential role in immune dysfunctional microenvironment promoting the occurrence and progression of endometriosis and can be a crucial target for developing immune microenvironment regulation strategies for the unmet long-term management of endometriosis. The albumin nanoparticles constructed based on SPARC overexpression in macrophages and endometrial cells and albumin biosafety can achieve the targeted therapy of endometriosis by increasing the passive- and active-mediated drug accumulation in ectopic endometrium and remodeling the immune microenvironment based on macrophage regulation. This study has the following implications: i) overcoming the inherent shortcomings of clinical drugs by nanotechnology is an alternative way of developing medication; ii) developing microenvironment modulation strategies based on macrophage regulation for endometriosis management is feasible., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024. Published by Elsevier Ltd.)

Research Question: What influence does an intramural myoma have on the endometrium, and how is this mediated?, Design: Endometrium was collected from 13 patients with non-cavity-distorting intramural myomas (diameter ≤4 cm; International Federation of Gynecology and Obstetrics type 4) and 13 patients without myomas undergoing hysterectomy for benign cervical diseases with a similar clinical baseline. Endometrial organoids were established in vitro and induced to reach the secretory phase by oestrogen and progesterone. Transcriptome sequencing was conducted on endometrial organoids in both untreated and secretory stages from three individuals with myomas and three control participants. Immunofluorescence and real-time quantitative PCR (RT-qPCR) were performed on endometrial organoids from another 10 myoma patients and 10 control patients for validation., Results: The data revealed abnormally increased hormone receptor (PGR) levels in the untreated endometrial organoids with myomas, resulting in potentially abnormal glandular and vascular development. The aberrant responses to oestrogen and progestogen prompted further investigation into the secretory phase. The secretory endometrial organoids with myomas exhibited greater changes in acetyl-α-tubulin, ODF2 and TPPP, demonstrating likely decreased cilia, and COL6A1, used as a marker for increased extracellular matrix (ECM) modelling. Both untreated and secretory endometrial organoids with myoma showed an up-regulation of genes and pathways related to ECM mechanotransduction. The expression pattern of receptivity-related genes was disturbed in endometrial organoids with myoma., Conclusions: This study is the first to reveal that intramural myomas create an abnormal hormonal and mechanical environment in the untreated and secretory endometrial organoids. The intramural myomas negatively impacted gene expression relating to endometrial glands, blood vessels, cilia and ECM, indicating that intramural myomas impair endometrial decidualization and receptivity., (Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

Objective: The aim was to analyze the clinical characteristics, controlled ovarian stimulation status, pregnancy outcomes, and major factors influencing live births in patients with endometrial hyperplasia (EH) undergoing IVF/ICSI for assisted reproduction, so as to identify potential intervention measures., Study Design: Patients with EH who achieved complete remission (CR) after conservative treatment and who were undergoing their first IVF/ICSI cycle were included in this matched-pair study. Patients with normal endometriums were matched at a 1:2 ratio with the control group for the first cycle of controlled ovarian stimulation. Matching was based on age, and reproductive outcomes were analyzed., Results: Among the 263 patients (including 51 cases with atypical endometrial hyperplasia) in the study group, the pregnancy rate after the first controlled ovarian stimulation cycle was 48.67 % (128/263), and the live birth rate was 34.98 % (92/263). Multiple logistic regression analysis revealed that maternal age, body mass index (BMI), and endometrial thickness were significantly associated with live births (P<0.001). Specifically, being aged ≥ 35 years (OR 0.450, 95 % CI 0.223-0.907) and having a BMI≥28 kg/m 2 (OR 0.358, 95 % CI 0.161-0.798) were identified as unfavorable factors for a clinical live birth, while an endometrial thickness ≥ 10 mm was found to be a favorable factor., Conclusion(s): ART is effective in patients with EH who have achieved CR after conservative treatment. Avoiding unnecessary intrauterine procedures, controlling body weight appropriately, and choosing suitable ART methods as soon as possible may be beneficial for clinical outcomes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

The aims of this study were: To ultrasonographically describe and compare endometrial echogenicity and heterogeneity using digital analysis in normal and bitches suffering from pyometra, cystic endometrial hyperplasia (CEH) and endometritis; and to evaluate the effect of clinical, bacteriological and histopathological uterine parameters on endometrial echogenicity and heterogeneity. Forty-one post pubertal intact bitches were included. According to clinical, ultrasonographic, anatomopathological and histopathological uterine evaluation, the animals were classified as: Pyometra (PYO; n=6); CEH (n=8); Endometritis (END; n=13); Normal group (NG; n=14). Endometrial images were analyzed with ImageJ software to obtain echogenicity and heterogeneity, represented as the mean gray value (MGV) and standard deviation of gray (SDG), respectively. The effect of the group, clinical, bacteriological, ultrasonographic and histological variables on MGV and SDG were analyzed by a generalized linear model. PYO exhibited higher MGV (P<0.01) and SDG (P<0.01) than the other groups. No differences were found among CEH, END and NG for both parameters (P>0.1). Body weight decreased MGV (P<0.01), while increasing degrees of inflammatory reaction (P<0.01), edema (P<0.01), hemorrhages (P<0.01) and vascular congestion (P<0.01) were associated with higher MGV. Inflammatory reaction (P<0.01) and ulceration (P<0.01) increased SDG. Ultrasonographic images evaluated using computer assisted image analysis were useful to differentiate pyometra from other uterine conditions in dogs. However, this technique could not differentiate among CEH, END and NG. Uterine echogenicity and echotexture, which clearly represent the different histopathological patterns, contribute to the diagnosis of the definite diagnosis of some canine uterine diseases., Competing Interests: Declaration of Competing Interest None of the authors have any conflict of interest to declare., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Objective: To determine the cutoff value for endometrial thickness (ET) that prompts a biopsy in asymptomatic postmenopausal women with an incidental finding of thickened endometrium, and to develop a risk prediction model., Methods: This is a retrospective cohort analysis of the clinical records of the Hysteroscopic Center of Fu Xing Hospital, Capital Medical University, Beijing, China. We collected asymptomatic postmenopausal women who presented with an ET of ≥4 mm (double-layer) as an incidental finding. We stratified the participants into non-malignant and malignant groups based on pathology results and assessed differences between the two groups. A receiver operating characteristic curve (ROC) was used to identify the cutoff value of ET for predicting endometrial malignancy. Logistic regression models were also constructed to predict the risk of malignancy., Results: A total of 581 consecutive eligible cases were included. The optimal cutoff value for ET was 8 mm, with a maximum area under the curve (AUC) of 0.755 (95 % CI: 0.645-0.865). In addition to ET, the regression model incorporated diabetes, blood flow signal, BMI, and hypertension to predict the risk of malignancy. A ROC curve constructed for the model yielded an AUC of 0.834 (95 % CI: 0.744-0.924)., Conclusion: It is reasonable to offer hysteroscopy and visually-directed endometrial biopsy for asymptomatic postmenopausal women when ET is 8 mm or above. For those with an ET between 4 and 8 mm, further decision to perform biopsy should be determined on an individual basis, considering risk factors and blood flow signals of the endometrium., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Endometriosis is a disease affecting approximately 10% of reproductive age women. Loss of the tumor suppressor gene AT-rich interactive domain-containing protein 1A (ARID1A) occurs in some endometriosis cases. Histone deacetylase 6 (HDAC-6) is an enzyme with implication in several diseases including different cancer types and immunological disorders, where it is involved in protein trafficking and degradation, cell shape, and migration. In ARID1A-deficient ovarian cancer increased HDAC-6 expression lead to apoptosis-inhibiting post-translational modification of p53. It is not known if HDAC-6 expression is also altered in ARID1A-deficient endometriosis. The aim of this study was to assess HDAC-6 expression in endometriotic lesions in correlation to ARID1A-status. Two tissue-microarrays with 168 endometriotic lesions, including ovarian (64/168, 38 %), peritoneal (66/168, 39 %) and deep-infiltrating (38/168, 23 %) subtypes, and 73 endometrium of women without endometriosis were assessed. Mean ARID1A immunoreactivity score (IRS) in endometriosis group was 10.83 (±2.36) and 10.78 (±1.94) in the epithelium and stroma, respectively, while the respective mean HDAC6 IRS were 9.16 (±2.76) and 5.94 (±2.88). The comparison of the HDAC6 expression between endometriosis subtypes showed higher expression in deep-infiltrating endometriosis, in both, epithelium (p = 0.032) and stroma (p = 0.007). In ARID1A negative cases, epithelial expression of HDAC6 was higher in endometriosis compared to women without endometriosis (p = 0.031), and this was also specifically observed in the subset of ovarian endometriosis (p = 0.037). There were no significant differences in the stromal expression of HDAC6. In conclusion, our results demonstrate a complex expression pattern of HDAC6 depending on ARID1A status in different endometriosis subtypes. Further studies on HDAC6 and ARID1A are important to elucidate mechanisms involved in malignant transformation of endometriosis., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Sterile inflammation occurs in various chronic diseases due to many nonmicrobe factors. Examples include endometrial hyperplasia (EH), endometriosis, endometrial cancer, and breast cancer, which are all sterile inflammation diseases induced by estrogen imbalances. However, how estrogen-induced sterile inflammation regulates EH remains unclear. Here, a single-cell RNA-Seq is used to show that SHP2 upregulation in endometrial endothelial cells promotes their inflammatory activation and subsequent transendothelial macrophage migration. Independent of the initial estrogen stimulation, IL1β and TNFα from macrophages then create a feedforward loop that enhances endothelial cell activation and IGF1 secretion. This endothelial cell-macrophage interaction sustains sterile endometrial inflammation and facilitates epithelial cell proliferation, even after estradiol withdrawal. The bulk RNA-Seq results and phosphoproteomic analysis show that endothelial SHP2 mechanistically enhances RIPK1 activity by dephosphorylating RIPK1 Tyr380 . This event activates downstream activator protein 1 (AP-1) and instigates the inflammation response. Furthermore, targeting SHP2 using SHP099 (an allosteric inhibitor) or endothelial-specific SHP2 deletion alleviates endothelial cell activation, macrophage infiltration, and EH progression in mice. Collectively, the findings demonstrate that SHP2 mediates the transition of endothelial activation from estradiol-driven acute inflammation to macrophage-amplified chronic inflammation. Targeting sterile inflammation mediated by endothelial cell activation is a promising strategy for nonhormonal intervention in estrogen-related diseases., (© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)

Endometriosis is a multifactorial gynecological disease, with angiogenesis as a key hallmark. The role of exosomal microRNAs (miRNAs) in endometriosis is not well understood. This study investigates differentially expressed exosomal miRNAs linked to angiogenesis in endometriosis, clarifies their molecular mechanisms, and identifies potential targets. Primary endometrial stromal cells (ESCs) were cultured, and exosomes were extracted. In a co-culture system, ESC-derived exosomes were taken up by human umbilical vein endothelial cells (HUVECs). Endometriosis implant-ESC-derived exosomes (EI-EXOs) significantly promoted HUVEC proliferation, migration and tube formation compared to normal endometrium-exosomes (NE-EXOs), a finding consistent in vivo in mice. MiRNA sequencing and bioinformatics identified differentially expressed miR-21-5p from EI-EXOs, confirmed by RT-qPCR. The miR-21-5p inhibitor or GW4869 attenuated EI-EXO-induced HUVEC proliferation, migration, and tube formation. TIMP3 overexpression diminished the pro-angiogenic effect of EI-EXOs, which was reversed by adding EI-EXOs or upregulating miR-21-5p. These findings validate the crosstalk between ESCs and HUVECs mediated by exosomal miR-21-5p, and confirm the miR-21-5p-TIMP3 axis in promoting angiogenesis in endometriosis. KEY MESSAGES: ESC-derived exosomes were found to be taken up by recipient cells, i.e. HUVECs. Functionally, endometriosis implant-ESC-derived exosomes (EI-EXOs) could significantly promote the proliferation, migration and tube formation of HUVECs compared to normal endometrium-exosomes (NE-EXOs). Through miRNA sequencing and bioinformatics analysis, differentially expressed miR-21-5p released by EI-EXOs was chosen, as confirmed by qRT-PCR. miR-21-5p inhibitor or GW4869 was found to attenuate the proliferation, migration, and tube formation of HUVECs induced by EI-EXOs. In turn, TIMP3 overexpression diminished the pro-angiogenic effect of EI-EXOs, and this angiogenic phenotype was reversed once EI-EXOs were added or miR-21-5p was upregulated., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Intrauterine adhesion (IUA) is a common complication of surgical manipulation of the uterine cavity such as abortion. The pathology of IUA is characterized by fibrosis, but the pathogenesis is not fully understood. The function of Apelin-13 in IUA and related mechanisms were investigated in this study. The IUA rat model was established. The pathological changes and fibrosis degree of rat uterine tissues were detected by HE and Masson staining after intraperitoneal injection of Apelin-13. Epithelial-mesenchymal transition (EMT) of endometrial epithelial cells and endothelial-mesenchymal transition (EnMT) of vein endothelial cells were induced by TGF-β1. Tube-forming assay using HUVEC was implemented to detect the effect of Apelin-13 upon angiogenesis. IHC staining, immunofluorescence staining, and Western blot were conducted to detect the expression levels of EMT markers, angiogenesis, and key proteins of the TGF-β1/Smad signaling. Apelin-13 significantly alleviated IUA and fibrosis, and increased endometrial thickness and gland number in IUA rats. In addition, Apelin-13 significantly reversed EMT and EnMT induced by IUA modeling and TGF-β1, promoted the tube-forming ability of HUVEC, and up-regulated the expression of angiogenesis-related proteins. Mechanistically, Apelin-13 significantly suppressed smad2/3 phosphorylation and inhibited the TGF-β1/Smad signaling via its receptor APJ. Apelin-13 might alleviate IUA via repressing the TGF-β1/Smad pathway and is expected to be a potent therapeutic option for the clinical treatment of IUA., (© 2024. The Author(s) under exclusive licence to Japan Human Cell Society.)

Background: The prevalence of placenta accreta spectrum, a potentially life-threatening condition, has exhibited a significant global rise in recent decades. Effective screening methods and early identification strategies for placenta accreta spectrum could enable early treatment and improved outcomes. Endometrial thickness plays a crucial role in successful embryo implantation and favorable pregnancy outcomes. Extensive research has been conducted on the impact of endometrial thickness on assisted reproductive technology cycles, specifically in terms of pregnancy rates, live birth rates, and pregnancy loss rates. However, limited knowledge exists regarding the influence of endometrial thickness on placenta accreta spectrum., Objective: This study aimed to evaluate the association between preimplantation endometrial thickness and the occurrence of placenta accreta spectrum in women undergoing assisted reproductive technology cycles., Study Design: A total of 4637 women who had not undergone previous cesarean delivery and who conceived by in vitro fertilization or intracytoplasmic sperm injection-embryo transfer treatment and subsequently delivered at the Third Affiliated Hospital of Guangzhou Medical University between January 2008 and December 2020 were included in this study. To explore the relationship between endometrial thickness and placenta accreta spectrum, we used smooth curve fitting, threshold effect, and saturation effect analysis. Multivariate logistic regression analysis was performed to evaluate the independent association between endometrial thickness and placenta accreta spectrum while adjusting for potential confounding factors. Propensity score matching was performed to reduce the influence of bias and unmeasured confounders. Furthermore, we used causal mediation effect analysis to investigate the mediating role of endometrial thickness in the relationship between gravidity and ovarian stimulation protocol and the occurrence of placenta accreta spectrum., Results: Among the 4637 women included in this study, pregnancies with placenta accreta spectrum (159; 3.4%) had significantly thinner endometrial thickness (non-placenta accreta spectrum, 10.08±2.04 mm vs placenta accreta spectrum, 8.88±2.21 mm; P<.001) during the last ultrasound before embryo transfer. By using smooth curve fitting, it was found that changes in endometrial thickness had a significant effect on the incidence of placenta accreta spectrum up to a thickness of 10.9 mm, beyond which the effect plateaued. Then, the endometrial thickness was divided into the following 4 groups: ≤7, >7 to ≤10.9, >10.9 to ≤13, and >13 mm. The absolute rates of placenta accreta spectrum in each group were 11.91%, 3.73%, 1.35%, and 2.54%, respectively. Compared with women with an endometrial thickness from 10.9 to 13 mm, the odds of placenta accreta spectrum increased from an adjusted odds ratio of 2.27 (95% confidence interval, 1.33-3.86) for endometrial thickness from 7 to 10.9 mm to an adjusted odds ratio of 7.15 (95% confidence interval, 3.73-13.71) for endometrial thickness <7 mm after adjusting for potential confounding factors. Placenta previa remained as an independent risk factor for placenta accreta spectrum (adjusted odds ratio, 11.80; 95% confidence interval, 7.65-18.19). Moreover, endometrial thickness <7 mm was still an independent risk factor for placenta accreta spectrum (adjusted odds ratio, 3.91; 95% confidence interval, 1.57-9.73) in the matched cohort after PSM. Causal mediation analysis revealed that approximately 63.9% of the total effect of gravidity and 18.6% of the total effect of ovarian stimulation protocol on placenta accreta spectrum were mediated by endometrial thickness., Conclusion: The findings of our study indicate that thin endometrial thickness is an independent risk factor for placenta accreta spectrum in women without previous cesarean delivery undergoing assisted reproductive technology treatment. The clinical significance of this risk factor is slightly lower than that of placenta previa. Furthermore, our results demonstrate that endometrial thickness plays a significant mediating role in the relationship between gravidity or ovarian stimulation protocol and placenta accreta spectrum., (Copyright © 2024 The Author(s). Published by Elsevier Inc. All rights reserved.)

Chlamydia abortus is a reported cause of infertility and endometritis in sheep, cattle, and pigs; however, the association between uterine disease and C. abortus is poorly understood in horses. Recently, a high prevalence of C. abortus in equine aborted chorioallantoises was reported in horses in western Canada. Based on this high prevalence, investigation into the effects of C. abortus on infertility and endometritis in western Canadian mares is prudent. We examined 98 formalin-fixed, paraffin-embedded endometrial biopsies from western Canada submitted between 2014 and 2022 using a Chlamydia -specific 16S rRNA PCR test; 40 samples tested positive for Chlamydia on PCR, and 28 were sequenced as C. abortus . The C. abortus -positive cases were primarily associated with a history of failure to conceive, early embryonic loss, or abortion. Our findings suggest that C. abortus may be a cause of conception failure and abortion in horses in western Canada., Competing Interests: Declaration of conflicting interestsThe authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Exosomes are natural carriers of biological macromolecules that are involved in the pathogenesis of a wide variety of inflammatory diseases. The purpose of this study was to investigate the role of exosomes derived from injured endometrial epithelial cells (EECs) in the development of endometritis. We isolated exosomes derived from LPS-injured EECs and identified these exosomes as proinflammatory mediators that can be internalized by macrophages and thus induce proinflammatory macrophage activation. We further found that miR-331 expression was sharply downregulated in exosomes derived from LPS-injured EECs and that macrophages treated with these exosomes also presented a lower level of miR-331. Importantly, the pathogenic role of exosomal miR-331 in promoting endometrial inflammation was revealed by the ability of adoptively transferred EECs-derived exosomes to cause macrophage activation, and this was reversed by miR-331 overexpression. Mechanistically, overexpression of miR-331 in macrophages mitigated NF-κB p65 phosphorylation by inhibiting the Notch1/IKKα pathway, which in turn curbed macrophage activation. In vivo assays further unveiled that miR-331 expression is negatively correlated with proinflammatory macrophage activation and that miR-331 upregulation markedly slowed disease progression in mice with endometritis. The exosome/miR-331/Notch1 axis plays a critical pathological role in endometrial inflammation, representing a new therapeutic target for endometritis., Competing Interests: Declaration of competing interest The authors have declared that no competing interest exists., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Oxidative phosphorylation is becoming increasingly important in the induction and development of endometriosis. Recently, it has been reported that ring finger protein 43 (RNF43) is involved in the process of oxidative phosphorylation, but the mechanism remains unclear. Our investigation is to delve into the roles of RNF43 in endometriosis and elucidate the related mechanisms. We found RNF43 was downregulated in ectopic endometrial tissue and primary ectopic endometrial stromal cells (ECESCs). Knockdown of RNF43 enhanced cell viability and migration by activating oxidative phosphorylation in eutopic endometrial stromal cells (EUESCs), while overexpression of RNF43 led to the opposite results. Moreover, RNF43 reinforced the ubiquitination and degradation of NADH dehydrogenase Fe-S protein 1 (NDUFS1) by interacting with it. Likewise to RNF43 overexpression, NDUFS1 silencing inhibited cell viability, migration, and oxidative phosphorylation in ECESCs. NDUFS1 was a downstream target of RNF43, mediating its biological role in endometriosis. Interestingly, the expression and stability of RNF43 mRNA were regulated by the Methyltransferase-like 3 (METTL3)/IGF2BP2 m6A modification axis. The results of rat experiments showed decreased RNF43 expression and increased NDUFS1 expression in endometriosis rats, which was enhanced by METTL3 inhibition. Those observations indicated that m6A methylation-mediated RNF43 negatively affects viability and migration of endometrial stromal cells through regulating oxidative phosphorylation via NDUFS1. The discovery of METTL3/RNF43/NDUFS1 axis suggested promising therapeutic targets for endometriosis., (© 2024 Wiley Periodicals LLC.)

Hormonal contraception (HC) is a well-recognized protection against endometrial cancer (EC) in the general population. It has not been established if this is also applicable to women with Lynch syndrome (LS), a condition associated with a up to 50% lifetime risk of developing EC. The objective of this study was to evaluate if the use of HC influences the incidence of endometrial hyperplasia and EC in women with LS by comparing the histology of annual endometrial biopsies obtained in patients with LS who are using HC versus non-users. This is a retrospective cohort study conducted with endometrial biopsies obtained in women 30 to 50 years of age with LS. The Pearson Chi-square test was performed to compare the prevalence of cancer and hyperplasia in the HC users and in the non-HC users groups. A total of 164 endometrial biopsies obtained among 75 women were suitable for analysis. Among the 86 biopsies obtained in the non-HC group, 81.4% (70/86) were normal. Two cases of endometrial carcinoma (2.3%) and 6 endometrial hyperplasia without atypia were found (7.0%). Among the 78 biopsies performed in patients using HC, 78.2% (61/78) were normal. Three endometrial hyperplasia without atypia (3.8%) and three cases of EC were diagnosed (3.8%). This study suggests that, in women of 30 to 50 years of age with LS, the use of hormonal contraception does not seem to decrease the occurrence of endometrial hyperplasia/carcinoma on annual endometrial histology., (© 2024. The Author(s), under exclusive licence to Springer Nature B.V.)

Study Objective: Endometrial biopsy (EB) is one of the most common gynecologic procedures. Office-based EB has replaced procedures involving general/loco-regional anesthesia and cervical dilatation performed in the operating room [1-3]. The Grasp Biopsy seems to be the most appropriate EB technique for reproductive-aged women [1,2,4]. Recently, the Visual D&C performed with hysteroscopic tissue removal devices has shown to be a valid alternative [5]. However, it is often difficult to obtain an adequate specimens in peri/post-menopausal women with hypo/atrophic endometrium [2]. Our aim is to show a novel hysteroscopic EB technique called "Rail Biopsy" which requires widespread and cheap instruments., Design: A step-by-step explanation of surgical techinque with narrated video footage., Setting: Tertiary Level Academic Hospital "IRCCS Azienda Ospedaliero-Universitaria di Bologna" Bologna, Italy., Interventions: We performed the "Rail Biopsy" technique with a 5.0 mm Continuous Flow Operative Hysteroscope with a 30° Lens and a 5Fr operative channel. We identify the endometrial target area (ETA), and we create a first track cutting through the endometrium in a caudo-cranial direction using cold scissors. We repeat the procedure, creating a second parallel track, thus completing our "rail" and isolating a wide ETA. Then, in the caudo-cranial direction, we cut through the stromal layer beneath the ETA. With a 5Fr cold grasping forceps, we clench the cranial edge of the ETA, and we remove it from the uterine cavity. A high-quality specimen, even in the case of hypo/atrophic endometrium or focal sessile lesions, can be obtained with this technique. The crucial aspect of the "Rail Biopsy" indeed is cutting through the stromal tissue while the endometrium is minimally touched, avoiding thermal damage deriving from electrosurgery. The instruments required are widespread and cheap. Moreover, this technique can be performed on any wall of the uterus, under vision, and, in the majority of patients, in an office-setting without cervical dilatation or general/loco-regional anesthesia, making it an attractive alternative to hysteroscopy performed in the operating room setting. Further studies comparing "Rail Biopsy" to other EB techniques are needed., Conclusion: We showed a novel approach for hysteroscopic EB that may be particularly useful in patients with hypo/atrophic endometrium, easy to learn and with low costs. VIDEO ABSTRACT., (Copyright © 2024 AAGL. Published by Elsevier Inc. All rights reserved.)

Endometrial cancer is the most common gynecological cancer in the developed world. However, the accuracy of current diagnostic methods is still unsatisfactory and time-consuming. Here, we presented an alternate approach to monitoring the progression of endometrial cancer via multiphoton microscopy imaging and analysis of collagen, which is often overlooked in current endometrial cancer diagnosis protocols but can offer a crucial signature in cancer biology. Multiphoton microscopy (MPM) based on the second-harmonic generation and two-photon excited fluorescence was introduced to visualize the microenvironment of endometrium in normal, hyperplasia without atypia, atypical hyperplasia, and endometrial cancer specimens. Furthermore, automatic image analysis based on the MPM image processing algorithm was used to quantify the differences in the collagen morphological features among them. MPM enables the visualization of the morphological details and alterations of the glands in the development process of endometrial cancer, including irregular changes in the structure of the gland, increased ratio of the gland to the interstitium, and atypical changes in the glandular epithelial cells. Moreover, the destructed basement membrane caused by gland proliferation and fusion is clearly shown in SHG images, which is a key feature for identifying endometrial cancer progression. Quantitative analysis reveals that the formation of endometrial cancer is accompanied by an increase in collagen fiber length and width, a progressive linearization and loosening of interstitial collagen, and a more random arrangement of interstitial collagen. Observation and quantitative analysis of interstitial collagen provide invaluable information in monitoring the progression of endometrial cancer. Label-free multiphoton imaging reported here has the potential to become an in situ histological tool for effective and accurate early diagnosis and detection of malignant lesions in endometrial cancer., (© 2024. The Author(s).)

Stress-inducible heat shock protein 70 (Hsp70), which functions as a molecular chaperone and is frequently overexpressed in different cancer cell types, is present on the cell surface of tumor cells and is actively released into the circulation in free and extracellular lipid vesicle-associated forms. Since the exact pathomechanism of endometriosis has not yet been elucidated (although it has been associated with the development of endometrial and ovarian cancer), we asked whether extracellular Hsp70 and circulating endometriotic cells (CECs) reflect the presence and development of endometriosis. Therefore, circulating levels of free and lipid microvesicle-associated Hsp70 were measured using the Hsp70-exo ELISA, and the presence of circulating CECs in the peripheral blood of patients with endometriosis was determined using membrane Hsp70 (mHsp70) and EpCAM monoclonal antibody (mAb)-based bead isolation approaches. Isolated CECs were further characterized by immunofluorescence using reagents directed against cytokeratin (epithelial marker), CD45 (leukocyte marker), CD105/CD44 (mesenchymal stemness markers) and by comparative RNA analysis. Similar to the situation in patients with cancer, the levels of circulating Hsp70 were elevated in the blood of patients with histologically proven endometriosis compared to a healthy control cohort, with significantly elevated Hsp70 levels in endometriosis patients with lesions outside the uterine cavity. Moreover, CECs could be isolated using the cmHsp70.1 mAb-based, and to a lesser extent EpCAM mAb-based, bead approach in all patients with endometriosis, with the highest counts obtained using the mHsp70-targeting procedure in patients with extra-uterine involvement. The longevity in cell culture and the expression of the cytokeratins CD105 and CD44, together with differentially expressed genes related to epithelial-to-mesenchymal transition (EMT), revealed similarities between mHsp70-expressing CECs and circulating tumor cells (CTCs) and suggest a mesenchymal stem cell origin. These findings support the involvement of mHsp70-positive stem cell-like cells in the development of endometriotic lesions. In summary, elevated levels of Hsp70 and CECs in the circulation could serve as liquid biopsy markers for endometriosis with extra-uterine involvement and help to elucidate the underlying pathomechanism of the disease.

Background: Endometriosis, due to its ambiguous symptoms, still remains one of the most difficult female diseases to treat, with an average diagnosis time of 7-9 years. The changing level of hypoxia plays an important role in a healthy endometrium during menstruation and an elevated expression of the hypoxia-inducible factor 1-alpha (HIF-1α) has been demonstrated in ectopic endometria. HIF-1α mediates the induction of proangiogenic factors and the development of angiogenesis is a critical step in the establishment and pathogenesis of endometriosis. Although the inhibition of angiogenesis has been proposed as one of the actionable therapeutic modalities, vascular normalization and re-oxygenation may become a possible new approach for therapeutic intervention., Methods: Our goal was to investigate whether a selected murine model of endometriosis would be suitable for future studies on new methods for treating endometriosis. Non-invasive, high-resolution ultrasound-monitored observation was selected as the preclinical approach to obtain imaging of the presence and volume of the endometriotic-like lesions. The EF5 (2-(2-Nitro-1H-imidazol-1-yl)-N-(2,2,3,3,3-pentafluoropropyl)acetamide) compound that selectively binds to reduced proteins in hypoxic cells was used for hypoxia detection. The expression of Pten and other crucial genes linking endometriosis and hypoxia were also assessed., Results: Using EF5, a pentafluorinated derivative of the 2-nitroimidazole that is metabolically reduced by oxygen-inhibitable nitroreductase, we confirmed that hypoxia did develop in the selected model and was detected in uterine and ectopic endometriotic lesions. Moreover, the changes in oxygen tension also influenced the expression level of significant genes related to endometriosis, like Pten, Trp53, Hif1a, Epas1, and Vegfa. Their strong modulation evidenced here is indicative of model reliability. Using high-resolution ultrasound-based imaging, we present a non-invasive method of visualization that enables the detection and observation of lesion evolution throughout the duration of the experiment, which is fundamental for further preclinical studies and treatment evaluation., Conclusions: The selected model and method of visualization appear to be suitable for the study of new treatment strategies based on hypoxia alleviation and blood flow restoration., (© 2024. The Author(s).)

Unavoidable damage to the basal layer of the endometrium has a huge negative impact on a woman's reproductive health and menstrual cycle. However, it is difficult for medicine to penetrate a series of biological barriers toward the basal layer in the deeper area of the endometrium. To meet this challenge, we developed an ultrasound-responsive hydrogel incorporated with a transforming growth factor-beta (TGF-β) mimetic peptide to enhance pregnancy outcomes by restoring the function of a wounded endometrium due to its deep-tissue-penetration capability. In vitro studies revealed that the TGF-β-mimetic-peptide-loaded hydrogel could achieve 64.35% of cell migration under ultrasound stimulation even in phosphate-buffered saline of pH 6.0. Upon in situ sonication at the uterus, carboxymethyl chitosan can be released from degraded hydrogel to open tight junctions with reduced interstitial pressure by ultrasound to promote deep penetration. Rat studies revealed that the penetration capability of TGF-β-mimetic-peptide-loaded hydrogel with sonication was 1.6 times higher than that of the control group. Besides the rat uterine model, ex vivo human uterine tissue was also collected and imaged, demonstrating up to ∼700 μm of tissue penetration depth. In addition, compared to control groups, effective uterus recovery without intrauterine stenosis and endometrial cavity fluid was observed from rats with severe uterine injury treated by TGF-β-mimetic-peptide-loaded hydrogel. In addition, fertility restoration in the endometrial injury model was observed after treatment with such an ultrasound-responsive hydrogel incorporated with TGF-β mimetic peptides. Overall, this work provides an effective approach to treating endometrial injury for enhanced pregnancy outcomes.

Endometriosis is a common chronic disorder characterized by the growth of endometrium-like tissue outside the uterine cavity. The disease is associated with chronic inflammation and pelvic pain and may have an impact on the patient's fertility. The causative factors and pathophysiology of the disease are still poorly recognized. The dysregulation of the immune system, aberrant tissue remodeling, and angiogenesis contribute to the disease progression. In endometriosis patients, the proteins regulating the breakdown and reorganization of the connective tissue, e.g., collagenases, and other proteases, as well as their inhibitors, show an incorrect pattern of expression. Here, we report that the expression of reversion-inducing cysteine-rich protein with Kazal motifs ( RECK ), one of the inhibitors of connective tissue proteases, is elevated in endometrioma cysts as compared to normal endometrium from unaffected women. We also demonstrate a reduced level of miR200b in endometriotic tissue that correlates with RECK mRNA levels. Furthermore, we employ the 12Z cell line, derived from a peritoneal endometriotic lesion, and the Ishikawa cell line, originating from endometrial adenocarcinoma to identify RECK as a direct target of miR200b. The described effect of miR200b on RECK , together with the aberrant expression of both genes in endometrioma, may help to understand the role played by the tissue remodeling system in the pathogenesis of endometriosis.

Background: Exosomes derived from endometrial regenerative cells (ERC-Exos) can inherit the immunomodulatory function from ERCs, however, whether ERC-Exos exhibit such effect on inflammatory bowel diseases with mucosal immune dysregulation has not been explored. Insulin-like growth factor-Ⅱ (IGF2) is considered to possess the potential to induce an anti-inflammatory phenotype in immune cells. In this study, the contribution of IGF2 in mediating the protective efficacy of ERC-Exos on colitis was investigated., Methods: Lentiviral transfection was employed to obtain IGF2-specific knockout ERC-Exos (IGF2 -/- -ERC-Exos). Experimental colitis mice induced by dextran sulfate sodium (DSS) were divided into the phosphate-buffered saline (untreated), ERC-Exos-treated and IGF2 -/- -ERC-Exos-treated groups. Colonic histopathological analysis and intestinal barrier function were explored. The infiltration of CD4 + T cells and dendritic cells (DCs) were analyzed by immunofluorescence staining and flow cytometry. The maturation and function of bone marrow-derived dendritic cells (BMDCs) in different exosome administrations were evaluated by flow cytometry, ELISA and the coculture system, respectively., Results: Compared with the untreated group, ERC-Exos treatment significantly attenuated DSS-induced weight loss, bloody stools, shortened colon length, pathological damage, as well as repaired the weakened intestinal mucosal barrier, including promoting the goblet cells retention, restoring the intestinal barrier integrity and enhancing the expression of tight junction proteins, while the protective effect of exosomes was impaired with the knockout of IGF2 in ERC-Exos. Additionally, IGF2-expressing ERC-Exos decreased the proportions of Th1 and Th17, increased the proportions of Treg, as well as attenuated DC infiltration and maturation in mesenteric lymph nodes and lamina propria of the colitis mice. ERC-Exos were also observed to be phagocytosed by BMDCs and IGF2 is responsible for the modulating effect of ERC-Exos on BMDCs in vitro., Conclusions: Exosomes derived from ERCs can exert a therapeutic effect on experimental colitis with remarkable alleviation of the intestinal barrier damage and the abnormal mucosal immune responses. We emphasized that IGF2 plays a critical role for ERC-Exos mediated immunomodulatory function and protection against colitis., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Author(s). Published by Elsevier B.V. All rights reserved.)

Background: Adenomyosis is a common gynecological disease, characterized by overgrowth of endometrial glands and stroma in the myometrium, however its exact pathophysiology still remains uncertain. Emerging evidence has demonstrated the elevated level of arginase 2 (ARG2) in endometriosis and adenomyosis. This study aimed to determine whether ARG2 involved in mitochondrial function and epithelial to mesenchymal transition (EMT) in adenomyosis and its potential underlying mechanisms., Materials and Methods: RNA interference was used to inhibit ARG2 gene, and then Cell Counting Kit (CCK-8) assay and flow cytometery were performed to detect the cell proliferation capacity, cell cycle, and apoptosis progression, respectively. The mouse adenomyosis model was established and RT-PCR, Western blot analysis, mitochondrial membrane potential (Δψm) detection and mPTP opening evaluation were conducted., Results: Silencing ARG2 effectively down-regulated its expression at the mRNA and protein levels in endometrial cells, leading to decreased enzyme activity and inhibition of cell viability. Additionally, ARG2 knockdown induced G0/G1 cell cycle arrest, promoted apoptosis, and modulated the expression of cell cycle- and apoptosis-related regulators. Notably, the interference with ARG2 induces apoptosis by mitochondrial dysfunction, ROS production, ATP depletion, decreasing the Bcl-2/Bax ratio, releasing Cytochrome c, and increasing the expression of Caspase-9/-3 and PARP. In vivo study in a mouse model of adenomyosis demonstrated also elevated levels of ARG2 and EMT markers, while siARG2 treatment reversed EMT and modulated inflammatory cytokines. Furthermore, ARG2 knockdown was found to modulate the NF-κB and Wnt/β-catenin signaling pathways in mouse adenomyosis., Conclusion: Consequently, ARG2 silencing could induce apoptosis through a mitochondria-dependent pathway mediated by ROS, and G0/G1 cell cycle arrest via suppressing NF-κB and Wnt/β-catenin signaling pathways in Ishikawa cells. These findings collectively suggest that ARG2 plays a crucial role in the pathogenesis of adenomyosis and may serve as a potential target for therapeutic intervention., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Adenomyosis involves the infiltration of endometrial glands and stroma deep into the uterine tissue, causing disruption to the endometrial-myometrial interface (EMI). The role of interleukin-17 (IL-17) has been extensively studied in endometriosis, but its involvement in adenomyosis remains unclear. This study aimed to investigate the expression of IL-17 in eutopic and ectopic endometrium (adenomyosis) of individuals with adenomyosis at the level of EMI. Paired tissues of eutopic endometrium and adenomyoma were collected from 16 premenopausal women undergoing hysterectomy due to adenomyosis. The IL-17 system was demonstrated in paired tissue samples at the level of EMI by the immunochemistry study. Gene expression levels of IL-17A and IL-17 receptor (IL-17R) were assessed through quantitative real-time reverse transcription polymerase chain reaction (RT-PCR). Comparative gene transcript amounts were calculated using the delta-delta Ct method. By immunohistochemical staining, CD4, IL-17A, and IL-17R proteins were detected in both eutopic endometrium and adenomyosis at the level of EMI. IL-17A and IL-17R were expressed mainly in the glandular cells, and the expression of both IL-17A and IL-17R was found to be stronger in adenomyosis than in endometrium. 3-Diaminobenzidine (DAB) staining revealed greater IL-17A expression in adenomyosis compared to eutopic endometrium. Quantitative RT-PCR showed 7.28-fold change of IL-17A and 1.99-fold change of IL-17R, and the fold change level of both IL-17A and IL-17R is significantly higher in adenomyosis (IL-17A: p = 0.047, IL-17R: p = 0.027) versus eutopic endometrium. We found significantly higher IL-17 levels in adenomyosis compared to eutopic endometrium at the level of EMI. The results showed that the IL-17 system may play a role in adenomyosis.

Abnormal autophagy and the transforming growth factor-β (TGFβ)-SMAD3/7 signaling pathway play an important role in the development of intrauterine adhesions (IUAs); however, the exact underlying mechanisms remain unclear. In this study, we used IUA patient tissue and SMAD7 conditional knockout mice to detect whether SMAD7 effected IUA via regulation of autophagy and the TGFβ-SMAD3 signaling pathway. We applied a combination of techniques for the detection of p-SMAD3, SMAD7, autophagy and fibrosis-related proteins, autophagic flux, and analysis of the SMAD3 binding site. Endometrial tissue of patients with IUA exhibited lower expression levels of SMAD7. In endometrial stromal cells, silencing of SMAD7 inhibited autophagic flux, whereas overexpressed SMAD7 promoted autophagic flux. This SMAD7-mediated autophagic flux regulates the stromal-myofibroblast transition, and these phenotypes were regulated by the TGFβ-SMAD3 signaling pathway. SMAD3 directly binds to the 3'-untranslated region of transcription factor EB (TFEB) and inhibits its transcription. SMAD7 promoted autophagic flux by inhibiting SMAD3, thereby promoting the expression of TFEB. In SMAD7 conditional knockout mice, the endometria showed a fibrotic phenotype. Simultaneously, autophagic flux was inhibited. On administering the autophagy activator rapamycin, this endometrial fibrosis phenotype was partially reversed. The loss of SMAD7 promotes endometrial fibrosis by inhibiting autophagic flux via the TGFβ-SMAD3 pathway. Therefore, this study reveals a potential therapeutic target for IUA., (© The Author(s) 2024. Published by Oxford University Press on behalf of European Society of Human Reproduction and Embryology. All rights reserved. For permissions, please email: journals.permissions@oup.com.)

Problem: To identify the predictive factors for the recurrence of chronic endometritis (CE) in infertile women., Method of Study: In this case-control study, 1170 infertile women recovered from CE and underwent fertility treatment between December 2018 and August 2021. Among the 146 women (12.5%) who did not conceive or experienced pregnancy loss in 18 months after CE recovery, 105 consecutive women who underwent repeat endometrial biopsy for CD138 immunostaining and endometrial bacterial culturing were recruited. Thereafter, patients with and without CE recurrence were compared., Results: The total recurrence rate of CE was 29.5% (31 women). Multivariable logistic regression analysis to determine predictive factors for CE recurrence revealed that hysteroscopic surgery (odds ratio [OR], 0.10; 95% confidence interval [CI], 0.02-0.56; p = 0.0009) and pregnancy loss (OR, 4.13; 95% CI, 1.31-13.05; p = 0.016) were significantly associated with decreased and increased CE recurrence rates, respectively. Also, reexamination with CD138 immunostaining after 16-18 months (OR, 9.75; 95% CI, 1.47-64.64; p = 0.024) was significantly associated with increased CE recurrence rates. Among 49 patients without a history of pregnancy loss, the cumulative CE recurrence rates after 6, 12, and 18 months were 5.6%, 13.5%, and 20.4%, respectively., Conclusions: We recommend reexamination with endometrial CD138 immunostaining in patients with pregnancy loss or long-term infertility during fertility treatment. Hysteroscopic surgery without antibiotic therapy for CE associated with intrauterine abnormalities is also recommended., (© 2024 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)

The aim of this study was to identify differentially expressed lncRNAs (DElncRNAs) and mRNAs (DEmRNAs) in the endometrium of individuals with and without endometriosis (EMS) during the proliferative (P) and secretory (S) phases of the menstrual cycle. Tissues were obtained from 18 control (CT; P-phase [pCT], n = 8; S-phase [sCT], n = 13) and 23 EMS patients (P-phase [pEMS], n = 13; S-phase [sEMS], n = 12). DElncRNAs and DEmRNAs were analyzed using total RNA-sequencing. In P-phase, expression of NONHSAG019742.2 and NONHSAT120701.2 was significantly higher in EMS than control patients, that of while NONHSAG048398.2 and NONHSAG016560.2 was lower in EMS patients. In S-phase, expression of NONHSAT000959.2 , NONHSAT203423.1 , and NONHSAG053769.2 was significantly increased in EMS patients, while that of NONHSAG012105.2 and NONHSAG020839.2 was lower. In addition, the expression of HSD11B2 , THBS1 , GPX3 , and SHISA6 was similar to that of neighboring lncRNAs in both P- and S-phases. In contrast, ELP3 and NR4A1 , respectively, were up- or downregulated in pEMS tissues. In sEMS, expression of LAMB3 and HIF1A was increased, while expression of PAM was reduced. Our findings on lncRNAs and mRNAs encourage not only exploration of the potential clinical applications of lncRNAs and mRNAs as prognostic or diagnostic biomarkers for EMS but also to gain valuable insights into its pathogenesis.

Kenney-Doig scale is considered the international standard method for classifying uterine biopsies in mares; however, its objectivity has been questioned by various studies. In the present study, we analysed the degree of agreement between two pathologists when assessing the same set of 201 uterine biopsies, obtaining a slight to moderate level of agreement (κ = .34/κ w  = .57). Subsequently, we developed a numerical scale based on the evaluation of histological parameters, including inflammation, fibrosis, glandular density and lymphatic lacunae. Partial scores were summed to obtain a fifth parameter called Summation. The correlation between both scales was demonstrated (p < .0001), and their combined use resulted in a notable increase in the degree of agreement between the two pathologists (κ = .53/κ w  = .67)., (© 2024 The Author(s). Reproduction in Domestic Animals published by Wiley‐VCH GmbH.)

Increased synthesis and deposition of collagen (COL) in the extracellular matrix (ECM) of equine endometrium contributes to endometrosis. Toll-like receptors (TLRs) are transmembrane receptors involved in the innate immune response, recognized for their role in antigen recognition and previously associated with equine endometritis. The TLRs not only recognize pathogen-associated molecular patterns but also regulate inflammations, fibrosis and cancer. The aim of this study was to explore the relationship between TLR expression at different stages of Kenney and Doig's (K-D) grading and COL1 expression during the follicular phase of the oestrous cycle. Forty samples of endometrial tissues were collected post-mortem from mares on the follicular phase of the oestrous cycle (10 samples of each K-D category). Relative mRNA transcription of TLR-2, TLR-4 and COL1A2 genes was assessed using qPCR, and COL1 protein expression by Western blot analysis. The COL1A2 transcription increased in category IIB when compared to categories I, IIA and III endometria (p < .01). The relative protein abundance of COL1 showed no significant differences between endometrial categories (p > .05). As for the TLRs mRNA transcription, TLR-2/-4 transcripts increased in IIA when compared to the other K-D endometria categories (p < .05). Our findings suggest that TLRs may be involved in the initiation of the endometrial inflammatory response. Additional studies are needed to explore TLRs' potential role as diagnostic markers for monitoring inflammation progression and fibrosis development, as well as their involvement in the mechanisms underlying fibrotic pathways., (© 2024 Wiley‐VCH GmbH. Published by John Wiley & Sons Ltd.)

Background and Objective: B-cell lymphoma-2 (BCL-2) is an anti-apoptotic protein that may play a role in disordered proliferative endometrium (DPE) and endometrial hyperplasia (EH). Several studies have investigated BCL-2 expression in normal, hyperplastic endometrium and endometrial adenocarcinoma, with conflicting results. Therefore, the present study aimed to compare the expression of BCL-2 in disordered proliferative endometrium and simple EH., Methods: In this cross-sectional study, 63 DPE and 67 SEH samples from patients referred to Mostafa Khomeini Hospital between 2017 and 2022 were immunohistochemically stained by BCL-2 antibody. BCL-2 expression in each sample was reported as negative, weak positive, and strong positive. The findings were analyzed using SPSS version 16 software., Results: Negative, weakly positive, and strongly positive BCL-2 expression was observed in 55.6%, 38.1%, and 6.3% of DPE samples, and 61.2%, 31.3%, and 7.5% of SEH samples, respectively, which does not show a statistically significant difference (p=0.718). There was no relationship between the age of patients and BCL-2 expression in any of the two groups of DPE and SEH (p=0.378 and p=0.178, respectively)., Conclusion: BCL-2 expression is observed with a relatively similar frequency in DPE and SEH samples, and it is probably under the control of oestrogen hormone as the main factor involved in the pathogenesis of these lesions., (Copyright © 2024 Sociedad Española de Anatomía Patológica. Publicado por Elsevier España, S.L.U. All rights reserved.)

Understanding of molecular mechanisms contributing to the pathophysiology of endometriosis, and upstream drivers of lesion formation, remains limited. Using a C57Bl/6 mouse model in which decidualized endometrial tissue is injected subcutaneously in the abdomen of recipient mice, we generated a comprehensive profile of gene expression in decidualized endometrial tissue (n=4), and in endometriosis-like lesions at Day 7 (n=4) and Day 14 (n=4) of formation. High-throughput mRNA sequencing allowed identification of genes and pathways involved in the initiation and progression of endometriosis-like lesions. We observed distinct patterns of gene expression with substantial differences between the lesions and the decidualized endometrium that remained stable across the two lesion timepoints, and showed similarity to transcriptional changes implicated in human endometriosis lesion formation. Pathway enrichment analysis revealed several immune and inflammatory response-associated canonical pathways, multiple potential upstream regulators, and involvement of genes not previously implicated in endometriosis pathogenesis, including IRF2BP2 and ZBTB10, suggesting novel roles in disease progression. Collectively, the provided data will be a useful resource to inform research on the molecular mechanisms contributing to endometriosis-like lesion development in this mouse model., Competing Interests: Competing interests The authors declare no competing or financial interests., (© 2024. Published by The Company of Biologists Ltd.)

Purpose: The purpose of this study is to determine whether intrauterine infusion of autologous platelet-rich plasma (PRP) gel increases endometrial thickness (EMT) and improves the outcomes of frozen-thawed embryo transfer (FET) in women with thin endometrium., Methods: This study included 111 women (aged 25-44 years) who had thin endometrium. All patients had at least one previous cycle canceled because of thin endometrium or previous embryo transfer cycles and an EMT < 7 mm. Forty-seven women underwent intrauterine infusion of autologous PRP gel on three occasions during endometrial preparation and the remaining women served as controls. The final EMT was measured by ultrasound before the start of the luteal phase, and FET-related outcome parameters were monitored., Results: Mean EMT was greater in women who received PRP gel than in those who did not (6.7 mm vs. 6.3 mm, respectively, p < 0.05). FET was attempted in all women. The 47 women who underwent infusion of PRP had a significantly higher pregnancy rate (18 pregnancies (38.3%), with 17 (36.2%) ongoing) compared with 64 control women (ten pregnancies (18.5%), nine (16.7%) ongoing). However, there was no significant reduction in the miscarriage rate., Conclusion: Intrauterine infusion of autologous PRP gel during endometrial preparation for FET cycles can improve the EMT, clinical pregnancy rate, and ongoing pregnancy rate in women with thin endometrium., (© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)

Purpose: The purpose of this study was to determine the effects of intrauterine infusion of autologous blood cell derivative (ABCD) on endometrial thickness and pregnancy outcomes in a group of patients who underwent IVF with recurrent implantation failure (RIF) and who had either a normal endometrium or thin endometrium., Methods: This retrospective study included 63 patients who experienced RIF at the Department of Reproductive Medicine and Surgery, KMC, Manipal, between January 2021 and March 2024 and who received three doses of intrauterine ABCD infusion to prepare the endometrium for frozen embryo transfer (FET)., Results: We enrolled 63 RIF patients, 30 with a normal endometrium (NEM) and 33 with a thin endometrium (TEM). The endometrial thickness (EMT) significantly increased across all the groups. After 3 cycles of intrauterine ABCD infusion, the mean increases in EMT in the NEM and TEM groups were 0.77 mm and 1.36 mm, respectively, which were statistically significant. Among the 62 completed FET cycles, 40.3% were positive for beta-hCG. The clinical pregnancy rate was 33.8% (40% in the NEM group, 28.1% in the TEM group), and the live birth rate was 24.2% (30% in the NEM group, 18.8% in the TEM group). A total of 9.7% of pregnancies had spontaneous miscarriages. Moreover, the EMT did not differ between the pregnant and nonpregnant groups., Conclusion: Intrauterine ABCD infusion improves the pregnancy outcomes of patients with RIF, regardless of the EMT. The results of this study revealed that endometrial receptivity improved significantly along with the EMT., (© 2024. The Author(s).)

Objectives: To transform the standardized descriptions of the ultrasound characteristics of endometrial and intrauterine lesions devised by the International Endometrial Tumor Analysis (IETA) group into a practical scoring method and to investigate whether application of this method enhances the diagnostic accuracy of ultrasound radiologists with different levels of experience in detecting malignancy compared with subjective assessment., Methods: This was a retrospective study of 855 patients with endometrial and/or intrauterine lesions, who were divided into a training (n = 600) and a validation (n = 255) set. Ultrasound radiologists with varying levels of experience (expert, intermediate and junior) evaluated all lesions by subjective assessment and according to IETA rules. Using IETA rules, the experts identified signs of malignancy in the training set, assigned scores for each indicator and validated the scoring method in the validation set. The intermediate-level and junior ultrasound radiologists reassessed the malignancy of the lesions using the IETA scoring method and compared their classifications with those made previously by subjective assessment. Postsurgical pathological evaluation was used as the reference standard., Results: Using subjective assessment, the experts demonstrated the highest level of diagnostic accuracy, with a sensitivity of 85.0%, specificity of 94.3% and an area under the receiver-operating-characteristics curve (AUC) of 0.897. Applying the IETA scoring method (comprising eight ultrasound characteristics that contributed to the total score) with a threshold of > 25 points for the diagnosis of malignancy achieved a sensitivity of 84.7%, specificity of 94.7% and AUC of 0.9533 in the training set, with similar performance in the validation set, when performed by experts. Using the IETA scoring method, both junior and intermediate ultrasound radiologists showed improvement in sensitivity (from 55.5% to 74.8% and from 70.2% to 77.1%, respectively), specificity (from 88.4% to 91.5% and from 87.4% to 92.2%, respectively) and AUC (from 0.704 to 0.827 and from 0.793 to 0.841, respectively) for diagnosing malignant lesions., Conclusions: The IETA scoring method exhibits high diagnostic efficacy for malignant endometrial and intrauterine lesions. This method compensates for the lack of experience among junior and intermediate-level ultrasound radiologists, enhancing their diagnostic skill to a level nearing that of experienced senior ultrasound radiologists. Further research is essential to validate the practicality of implementing this method and to confirm its clinical value. © 2024 International Society of Ultrasound in Obstetrics and Gynecology., (© 2024 International Society of Ultrasound in Obstetrics and Gynecology.)

Purpose: This study was presented to investigate the clinical-pathological characteristics of gestational trophoblastic neoplasia (GTN) following non-molar pregnancy and differentiated with ectopic pregnancy (EP)., Methods: The clinical data of 83 patients who were admitted for suspected GTN after non-molar pregnancy at the Women's Hospital School of Medicine Zhejiang University from January 2015 to September 2022 were selected for analysis., Results: In total, 41 cases were confirmed non-molar GTN, including 31 choriocarcinoma, 9 PSTT (placental site trophoblastic tumor), and 1 ETT (epithelioid trophoblastic tumor), while 42 cases were confirmed EP. Compared with ectopic pregnancy, non-molar GTN patients had lower levels of serum progesterone compared with EP (3.81 nmol/L vs 17.70 nmol/L, P = 0.001). Based on the ultrasound, the thickness of the endometrium was thinner in patients with non-molar GTN compared with EP (0.565 cm vs 0.70 cm, P = 0.018). By histopathologic examination, the endothelium of non-molar GTN showed less decidual-like changes compared with EP (64.3% vs 14.6%, P = 0.001)., Conclusion: A combination of serum progesterone levels, endometrium thickness, and histopathologic features of the endometrium can help to differentiate non-molar GTN and EP. Surgeries including hysteroscopy with curettage and/or laparoscopy are needed., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Research Question: Does the NOD-like receptor protein 3 (NLRP3) inflammasome have an effect in adenomyosis?, Design: Fresh-frozen endometrial tissues and paraffin specimens were obtained from endometrial tissues from patients with adenomyosis and controls. Western blot, quantitative real-time polymerase chain reaction (qRT-PCR) and immunohistochemistry (IHC) were applied to assess expression of the NLRP3 inflammasome components. Primary eutopic endometrial stromal cells were isolated from the uteri of patients with adenomyosis. After NLRP3 was knocked down using small interfering RNA, proliferation, invasion and epithelial-mesenchymal transition (EMT) were evaluated using EdU, CCK8, transwell assays and western blot. Importantly, a mouse model of adenomyosis was established to evaluate the effects of the NLRP3 inhibitor MCC950 on the formation of adenomyosis., Results: Expression of the NLRP3 inflammasome components was elevated in the ectopic or eutopic endometrium of patients with adenomyosis. NLRP3 knockdown inhibited migration, invasion and EMT in endometrial cells and primary endometrial cells (P < 0.0001). MCC950, which blocks the NLRP3 inflammasome, reduced migration and invasion of endometrial cells (P < 0.01) and primary endometrial cells (P < 0.0001) considerably. Importantly, in the mouse model of adenomyosis, MCC950 had a mitigating effect on the severity of adenomyosis (P < 0.01)., Conclusions: NLRP3 was found to enhance migration, invasion and EMT of human endometrial cells in adenomyosis. Notably, the NLRP3 inhibitor MCC950 reduced migration and invasion of endometrial cells effectively. Furthermore, in the mouse model of adenomyosis, MCC950 exhibited a therapeutic effect by alleviating the severity of adenomyosis., (Copyright © 2024 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.)

Endometriosis is characterized by the ectopic proliferation of endometrial cells, posing considerable diagnostic and therapeutic challenges. Our study investigates AGPAT4's involvement in endometriosis pathogenesis, aiming to unveil new therapeutic targets. Our investigation by analyzing eQTL data from GWAS for preliminary screening. Subsequently, within the GEO dataset, we utilized four machine learning algorithms to precisely identify risk-associated genes. Gene validity was confirmed through five Mendelian Randomization methods. AGPAT4 expression was measured by Single-Cell Analysis, ELISA and immunohistochemistry. We investigated AGPAT4's effect on endometrial stromal cells using RNA interference, assessing cell proliferation, invasion, and migration with CCK8, wound-healing, and transwell assays. Protein expression was analyzed by western blot, and AGPAT4 interactions were explored using AutoDock. Our investigation identified 11 genes associated with endometriosis risk, with AGPAT4 and COMT emerging as pivotal biomarkers through machine learning analysis. AGPAT4 exhibited significant upregulation in both ectopic tissues and serum samples from patients with endometriosis. Reduced expression of AGPAT4 was observed to detrimentally impact the proliferation, invasion, and migration capabilities of endometrial stromal cells, concomitant with diminished expression of key signaling molecules such as Wnt3a, β-Catenin, MMP-9, and SNAI2. Molecular docking analyses further underscored a substantive interaction between AGPAT4 and Wnt3a.Our study highlights AGPAT4's key role in endometriosis, influencing endometrial stromal cell behavior, and identifies AGPAT4 pathways as promising therapeutic targets for this condition., (© 2024. The Author(s).)

Objective: COVID-19 vaccination has been related to menstrual irregularities; however, the effect on postmenopausal women is unknown. The aim of this study was to analyze the prevalence of postmenopausal bleeding (PMB) after COVID-19 vaccination., Methods: A retrospective study was conducted in the Department of Gynecology in Hospital del Mar. Consecutive postmenopausal women with data available and endometrial biopsy were included between February 2021 and January 2022. Patients were stratified between COVID-19 vaccinated and unvaccinated groups. PMB after 30 days from last vaccine dose was considered unrelated to vaccine. Endometrial pathology diagnoses were stratified into benign or malignant. Univariable and multivariable of regression analysis on variables potentially associated with PMB was performed., Results: A total of 381 patients were included, 91 in the vaccinated group and 290 in the unvaccinated group. Prevalence of PMB in the vaccinated group was 75.8% compared to 59.0% in the unvaccinated group ( p  < 0.005). No increase in endometrial malignant pathology was observed among the vaccinated group ( p  = 0.189). Multivariable analysis that correlates factors associated with PMB suggests COVID-19 vaccine and malignant endometrial biopsy as independent risk variables., Conclusions: A higher prevalence of PMB was associated with COVID-19 vaccine. Endometrial histological results showed no association with COVID-19 vaccination, but endometrial biopsy should be performed for PMB.