Search

We analysed the embryonic epidermis of the pool frog, Pelophylax lessonae, by light and electron microscopy techniques, and characterized preliminarily its mucous secretions with conventional histochemistry (Toluidine Blue, Periodic Acid-Schiff, Alcian blue pH 2.5 and Alcian blue pH 1.0). At Gosner’s developmental stage 21, the epidermis consisted of a bilayered epithelium with five cell types. Basal cells (BCs) constituted the basal layer, presented a large nucleus and were sometimes observed in mitosis. Ciliated cells (CCs) had a ciliated apical membrane, with carboxylated glycans in the sub-apical portion. TEM analysis revealed small vesicles just below the surface, a central nucleus, and evident yolk plates. Goblet cells (GCs) and small secretory cells (SSCs) showed secreting vesicles and vacuoles, respectively. In the mucus secretion of GCs sialosulphomucins appeared, while in that of SSCs sulphation was not observed. Under TEM, GCs had irregular shaped nuclei and a less electron-dense cytoplasm with respect to SSCs. Ionocytes (INs) presented apical microvilli and a high electron-dense cytoplasm with vacuoles. SEM analysis revealed that GCs outnumbered the other cell types and that SSCs and INs were usually located together near to GCs. The relatively simple structure of the epidermis and its direct interfacing with the environment renders it a good model for the study of structure and development of mucociliary epithelia, as well as of its alterations in the presence of toxicants.

AbstractAn in situ analysis of mucin secretions along the annual cycle was performed on the striped Venus clam, Chamelea gallina. Individuals of both sexes from an exploited stock of Margherita di Savoia (Southern Adriatic Sea, Central Mediterranean Sea) were made in June 2020 and 2021, and in January 2021 and 2022, representative of summer and winter seasons, respectively. Tissues from the foot and the gills were analyzed for histochemical and lectin-histochemical analyses. Staining with Periodic Acid-Schiff, Alcian Blue pH 2.5 and High-Iron-Diamine indicated that mucins from both the foot and the gills were acidic, mostly sulfated. Lectin-binding analyses with PNA, SBA, WGA, LTA, UEA-I, AAA, SNA, MAA-II and ConA indicated the presence of N-acetyl-glycosaminylated, mannosylated and fucosylated residuals in the saccharidic chains. In the gills, the amount of acidic and glycosaminylated residuals was higher in summer in both sexes, whereas fucosylation was similar along the sampling period and mannosylation was never observed. In the foot, both surface epithelial and subepidermal secreting cells increased sulfation in winter in males, but not in females. Glycosaminylation and fucosylation were observed only in the surface cells of males. Mannosylated residuals were observed in all the foot cell types in both sexes. It is hypothesized that the observed qualitative and quantitative variations in mucin secretion is linked to the reproductive cycle.

Abstract Background Similarly to cortisol-secreting adrenal tumors, also non-functioning adrenal tumors (NFAT) may be associated with an increased cardiovascular risk. We assessed in NFAT patients: (i) the association between hypertension (HT), diabetes mellitus (DM), obesity (OB), dyslipidemia (DL) and cardiovascular events (CVE) and cortisol secretion; (ii) the cut-off of the cortisol secretion parameters for identifying NFAT patients with a worse cardiometabolic profile. Patients and methods In 615 NFAT patients (with cortisol levels after 1 mg overnight dexamethasone suppression test, F-1mgDST

Over the past few decades, the worldwide incidence of cutaneous melanoma, a malignant neoplasm arising from melanocytes, has been increasing markedly, leading to the highest rate of skin cancer-related deaths. While localized tumors are easily removed by excision surgery, late-stage metastatic melanomas are refractory to treatment and exhibit a poor prognosis. Consequently, unraveling the molecular mechanisms underlying melanoma tumorigenesis and metastasis is crucial for developing novel targeted therapies. We found that the multiple endocrine neoplasia type 1 (MEN1) gene product Menin is required for the transforming growth factor beta (TGFβ) signaling pathway to induce cell growth arrest and apoptosis in vitro and prevent tumorigenesis in vivo in preclinical xenograft models of melanoma. We further identified point mutations in two MEN1 family members affected by melanoma that led to proteasomal degradation of the MEN1 gene product and to a loss of TGFβ signaling. Interestingly, blocking the proteasome degradation pathway using an FDA-approved drug and RNAi targeting could efficiently restore MEN1 expression and TGFβ transcriptional responses. Together, these results provide new potential therapeutic strategies and patient stratification for the treatment of cutaneous melanoma.

IntroductionHypophosphatasia (HPP) is a rare genetic disease caused by inactivating variants of the ALPL gene. Few data are available on the clinical presentation in Italy and/or on Italian HPP surveys.MethodsThere were 30 suspected HPP patients recruited from different Italian tertiary cares. Biological samples and related clinical, biochemical, and anamnestic data were collected and the ALPL gene sequenced. Search for large genomic deletions at the ALPL locus (1p36) was done. Phylogenetic conservation and modeling were applied to infer the effect of the variants on the protein structure.ResultsThere were 21 ALPL variants and one large genomic deletion found in 20 out of 30 patients. Unexpectedly, NGS-driven differential diagnosis allowed uncovering three hidden additional HPP cases, for a total of 33 HPP subjects. Eight out of 24 coding variants were novel and classified as “pathogenic”, “likely pathogenic”, and “variants of uncertain significance”. Bioinformatic analysis confirmed that all the variants strongly destabilize the homodimer structure. There were 10 cases with low ALP and high VitB6 that resulted negative to genetic testing, whereas two positive cases have an unexpected normal ALP value. No association was evident with other biochemical/clinical parameters.DiscussionWe present the survey of HPP Italian patients with the highest ALPL mutation rate so far reported and confirm the complexity of a prompt recognition of the syndrome, mostly for HPP in adults. Low ALP and high VitB6 values are mandatory for the genetic screening, this latter remaining the gold standard not only to confirm the clinical diagnosis but also to make differential diagnosis, to identify carriers, to avoid likely dangerous therapy in unrecognized cases.

Abstract Background The reproductive cycle of the recently described sponge Tethya meloni was investigated for a period of 15 months (September 2018 – November 2019) in the Mar Piccolo of Taranto (Southern Italy) and was compared with data previously collected for the other two sympatric species of the same genus known for Mediterranean Sea, T. citrina and T. aurantium. Results T. meloni is a gonochoric species with a sex ratio strongly shifted towards females. Asexual budding was a seasonal process, limited to few specimens. In a specimen collected in September 2018 both oocytes and buds occurred, suggesting that in T. meloni the sexual and asexual phases may coexist both at the population and individual levels. Conclusions The data obtained from this research compared with the available literature confirm the high temporal variability of the reproductive cycles in the Mediterranean species of Tethya, but with common general characteristics. In sexual reproduction, the oocyte production period lasts several months, with a peak between summer and autumn while spermatogenesis, shorter but with greater reproductive effort, follows the onset of oogenesis. The asexual reproduction phase of T. meloni, on the other hand, occurs in a short period and seems to have less importance in the overall reproductive process.

We analysed the embryonic epidermis of the pool frog, Pelophylax lessonae, by light and electron microscopy techniques, and characterized preliminarily its mucous secretions with conventional histochemistry (Toluidine Blue, Periodic Acid-Schiff, Alcian blue pH 2.5 and Alcian blue pH 1.0). At Gosner's developmental stage 21, the epidermis consisted of a bilayered epithelium with five cell types. Basal cells (BCs) constituted the basal layer, presented a large nucleus and were sometimes observed in mitosis. Ciliated cells (CCs) had a ciliated apical membrane, with carboxylated glycans in the sub-apical portion. TEM analysis revealed small vesicles just below the surface, a central nucleus, and evident yolk plates. Goblet cells (GCs) and small secretory cells (SSCs) showed secreting vesicles and vacuoles, respectively. In the mucus secretion of GCs sialosulphomucins appeared, while in that of SSCs sulphation was not observed. Under TEM, GCs had irregular shaped nuclei and a less electron-dense cytoplasm with respect to SSCs. Ionocytes (INs) presented apical microvilli and a high electron-dense cytoplasm with vacuoles. SEM analysis revealed that GCs outnumbered the other cell types and that SSCs and INs were usually located together near to GCs. The relatively simple structure of the epidermis and its direct interfacing with the environment renders it a good model for the study of structure and development of mucociliary epithelia, as well as of its alterations in the presence of toxicants. Highlights: The embryonic epidermis of Pelophylax lessonae reveals a good model for the study of mucociliary epithelia. The embryonic epidermis of Pelophylax lessonae is made of two layers and five cell types. In the basal layer, there are basal cells, and in the apical layer, ciliated, goblet, and small secretory cells are found, as well as ionocytes. Goblet cells present secreting vesicles with sialosulphomucins. Small secretory cells show apical vacuoles with sialomucins only. [ABSTRACT FROM AUTHOR]

Context Current evidence of cardiovascular (CV) risk in primary hyperparathyroidism (PHPT) is still inconsistent. Objective To prospectively investigate changes of early atherosclerosis in patients with PHPT undergoing parathyroidectomy (PTx) or conservative management, according to consensus criteria. Methods Biochemical parameters of PHPT, CV risk factors (systolic and diastolic blood pressure, cholesterol [total, high-density, and low-density], triglyceride, HbA1c, HOMA-IR), and carotid intima-media thickness (IMT) and plaque were assessed in 52 consecutive postmenopausal PHPT patients both at baseline and ≥ 24 months after surgery (PTx, n = 22) or conservative management (non-PTx, n = 30). Results At baseline, PTx and non-PTx showed comparable age, BMI, renal function, and 25(OH)D levels, and did not differ for CV risk factors, IMT and plaques, or for prevalence of smoking, diabetes mellitus, or antihypertensive or statin therapy, while all parameters characterizing PHPT differed. Follow-up duration in PTx was longer than in non-PTx (P =.004). Parameters characterizing PHPT significantly improved ≥ 24 months after surgery, whereas in non-PTx serum phosphate slightly decreased and parathyroid hormone increased. Systolic and diastolic blood pressure increased at follow-up in both groups, while other CV risk factors did not significantly vary. In PTx, IMT did not significantly vary after surgery (0.85 ± 0.14 to 0.89 ± 0.22 mm, P =.366), whereas it significantly increased in non-PTx (0.80 ± 0.18 to 0.93 ± 0.23 mm, P =.008), even adjusting for blood pressure. Plaque prevalence and incidence did not significantly differ in the 2 groups. Conclusion Our results suggest that in postmenopausal patients with PHPT, subclinical atherosclerosis could be halted by PTx, whereas it worsens over time in nonoperated patients with milder disease. [ABSTRACT FROM AUTHOR]

Background: There are few and controversial results on 24,25(OH)2D and FGF23 acute changes following supplementation with cholecalciferol. Methods: Twenty-seven subjects with 25(OH)D < 30 ng/mL were randomized into three groups to receive a single oral dose of 25,000 I.U. or 600,000 I.U. of cholecalciferol or placebo, respectively. We measured 25(OH)D, 1,25(OH)2D, 24,25(OH)2D, and FGF23 levels at baseline and after 72 h. The 1,25(OH)2D/25(OH)D, 1,25(OH)2D/24,25(OH)2D, and 24,25(OH)2D/25(OH)D ratios were also calculated. Results: There was an increase in 25(OH)D and 1,25 (OH)2D following both doses of cholecalciferol. In the group administered 600,000 I.U., there was a significant increase in the delta changes in 25(OH)D and 1,25(OH)2D compared to the placebo and in the delta 24,25(OH)D2 compared to the placebo and 25,000 I.U. groups (all p < 0.05). A decrease in both the 1,25(OH)2D/25(OH)D and 1,25(OH)2D/24,25(OH)2D ratio (all p < 0.05) was observed in the 600,000 I.U. group. FGF23 values significantly increased only in the group administered 600,000 I.U. Conclusions: 25(OH)D and 1,25(OH)D levels significantly increased following 600,000 IU cholecalciferol administration compared to 25,000 I.U. and placebo. Following the massive administration of cholecalciferol, the CYP24A1 enzyme is actively involved in catabolism, thus, avoiding toxic effects. [ABSTRACT FROM AUTHOR]

Context The risk of vertebral fractures (VFx) in patients with nonfunctioning adrenal incidentalomas (NFAI) is unknown. Objective This work aimed to assess in NFAI patients the prevalence and incidence of VFx and a hormonal marker to identify patients at risk. Methods A retrospective, cross-sectional, and longitudinal study of outpatients was conducted. A total of 306 NFAI patients (cross-sectional arm) and 213 controls were evaluated for VFx prevalence; 85 NFAI patients (longitudinal arm, follow-up 30.3 ± 17.5 months) were evaluated for VFx incidence. Main outcome measures included serum cortisol after 1 mg-dexamethasone test (F-1mgDST), lumbar spinal (LS), and femoral neck (FN) bone mineral density (BMD) and VFx presence, by radiograph of the spine. Results Cross-sectional arm: prevalent VFx associated with F-1mgDST with a cutoff of 1.2 µg/dL (33 nmol/L, area under the curve 0.620 ± 0.39; P =.002). Compared with controls and NFAI patients with F-1mgDST less than 1.2 µg/dL (group A), NFAI patients with F-1mgDST greater than or equal to 1.2 µg/dL (group B) showed a higher VFx prevalence (10.8%, 12.6%, and 29.5%, respectively; P <.001 all comparisons), which was associated with F-1mgDST greater than or equal to 1.2 µg/dL (odds ratio 3.02; 95% CI, 1.63-5.58; P <.001) accounting to confounders. Longitudinal arm: the VFx incidence was higher in group B than in group A (19.3% vs 3.6%; P =.05). In group B, all incident VFx occurred in patients without low BMD. The F-1mgDST cutoff for predicting an incident VFx was 1.2 µg/dL, although statistical significance was not reached after adjustment for confounders (P =.061). Conclusion In NFAI patients, F-1mgDST levels greater than or equal to 1.2 µg/L (33 nmol/L) are associated with prevalent VFx and may identify patients at risk of incident VFx. [ABSTRACT FROM AUTHOR]

Aquaporins (AQPs) are important for water transport in the gastrointestinal tract. Changes in their expression and/or localization could cause in disorders and be used as therapeutic targets. Aquaporin‐4 (AQP4) is expressed predominantly on the basolateral membrane of the parietal cells in the corpus of the murine gastric glands. Although the secretion of gastric juice is not affected in AQP4‐deficient knockout, we evaluated by light microscopy whether the lack of AQP4 affects the glycopatterns of secreting gastric cells. Wild type (WT) and AQP4‐deficient knockout mice (KO) were fed a standard diet ad libitum before sacrifice. Segments of stomach corpus were collected, fixed in buffered formalin, and embedded in paraffin wax. Sections, 5‐μm thick, were analyzed by histochemical methods (Periodic acid‐Schiff, Alcian Blue pH 2.5), and binding of lectins specific to GalNAc (SBA, DBA), Gal (PNA) GlcNAc (WGA, GSAII) mannose and/or glucose (ConA), and fucose (UEA‐I, AAA, LTA). Immunohistochemical methods such as anti‐Muc6 for neck cells and anti‐ β‐ H+/K+‐ATPase for parietal cells were also performed. Compared to WT mice, in the mucous cells of KO lower amounts of glycans with galactosyl/galactosaminylated, glycosyl/glycosaminylated, and fucosylated residues were observed; lower fucosylation resulted also in the parietal cells. The observed differences of KO in respect to WT could lead to severer pathological conditions. Research Highlights: Glycopatterns in gastric glands were compared between wild type (WT) and AQP4‐deficient knockout (KO) mice by histochemical and lectin‐binding methods.In the mucous cells of KO lower amounts of glycans with galactosyl/galactosaminylated, glycosyl/glycosaminylated and fucosylated residues were observed.In the parietal cells lower fucosylation also resulted.AQP4‐deficiency affects glycosylation and could result in altered functionality and pathological conditions. [ABSTRACT FROM AUTHOR]

Aluminum (Al) is used in everyday life and present in food drugs, packaging, industry, and agriculture. Although it is the most common metal in the Earth crust, a correlation has been demonstrated between its presence and various pathologies, even serious ones, especially of a neurological type. However, there is a histological gap regarding the role Al can have in contact with the covering and secreting epithelia. The alterations of the ventral and dorsal foot mucocytes and their secretions of the snail Eobania vermiculata caused by Al were investigated in situ by histochemical and lectin‐histochemical techniques. Administration to different experimental groups took place for 3 and 9 days with 50 and 200 μM of AlCl3. Several types of mucocytes were detected with a prevalent secretion of acid glycans in the foot of E. vermiculata. Sulfated glycans prevail in the dorsal region, with one type showing only fucosylated residues and another also having galactosaminylated and glycosaminylated residues. Carboxylated glycans prevail in the ventral region, with presence of galactosaminylated, glycosaminylated, and fucosylated residuals in both cells. Snails treated presented a general decrease of mucin amount in the secreting cells and affected the mucus composition. These changes could alter the rheological and functional properties of the mucus with possible implications for the health of the treated animals. Research Highlights: Snails were fed with Al‐contaminated lettuce at different concentrations.In the foot mucocytes produced mucus with prevailing acidic glycans.In the treated resulted a reduction in the amount of mucus and an alteration of glycan composition. [ABSTRACT FROM AUTHOR]

ObjectiveThe best approach to patients with adrenal incidentaloma (AI) and possible autonomous cortisol secretion (PACS) is debated. The aim of this study was to assess the metabolic effect of adrenalectomy in AI patients with PACS in relation to cortisol secretion parameters, peripheral activation, and glucocorticoid sensitivity.DesignThis is a multicenter randomized study (NCT number: NCT04860180).MethodsSixty-two AI outpatients (40–75 years) with AI >1 cm and cortisol after overnight dexamethasone suppression test (F-1mgDST) between 50 and 138 nmol/L were randomized to adrenalectomy (Arm A) or a conservative approach (Arm B). Fifty-five patients completed the 6-month follow-up, 25 patients in Arm A (17 female patients, aged 62.5 ± 10.4 years) and 30 patients in Arm B (24 female patients, 66.1 ± 9.1 years). Plasma adrenocorticotroph hormone (ACTH), 24-h urinary free cortisol, 24-h urinary free cortisone, F-1mgDST, glucose, lipids, glycated hemoglobin (HbA1c) levels, blood pressure (BP), body weight, and treatment variations were assessed. The 24-h urinary free cortisol/cortisone ratio (an 11-beta hydroxysteroid dehydrogenase type 2 activity marker), BclI, and the N363S variants of glucocorticoid receptor (GR) polymorphisms were also evaluated.ResultsBP control improved in 68% and 13% of the subjects in Arm A and Arm B, respectively (p = 0.001), and the glycometabolic control improved in 28% and 3.3% of the subjects in Arm A and Arm B patients, respectively (p = 0.02). Arm A subjects more rarely showed the BP and/or glycometabolic control worsening than Arm B patients (12% and 40%, respectively, p = 0.03). The surgical approach was independently associated with BP amelioration (OR 3.0, 95% CI 3.8–108.3, p < 0.001) but not with age, F-1mgDST levels, BMI, and hypertension and diabetes mellitus presence at baseline. The 24-h urinary free cortisol/cortisone ratio and the presence of sensitizing GR polymorphisms were not associated with the surgical outcome. The receiver operating characteristic (ROC) curve analysis showed that the BP control amelioration was associated with F-1mgDST [area under the curve (AUC), 0.82 ± 0.09 p = 0.012]. The F-1mgDST cutoff with the best compromise in predicting the BP amelioration was set at 75 nmol/L (sensitivity 77%, specificity 75%).ConclusionsAI patients with PACS benefit from surgery in terms of BP and glycometabolic control.

Natural history museums are irreplaceable tools to study and preserve the biological diversity around the globe and among the primary actors in the recognition of species and the logical repositories for their type specimens. In this paper we surveyed the consistency of the preserved specimens of amphibians and reptiles housed in the major Italian scientific collections, and verified the presence of threatened species according to the IUCN Red List, including the Extinct (EX), Extinct in the Wild (EW), Critically Endangered (CR), Endangered (EN), and Vulnerable (VU) categories. Altogether, we analyzed 39 Italian zoological collections. We confirmed the presence of one extinct reptile (Chioninia coctei) and five extinct or extinct in the wild amphibian species (Atelopus longirostris, Nectophrynoides asperginis, Pseudophilautus leucorhinus, P. nasutus, and P. variabilis). Seven CR amphibians, fourteen CR reptile species and the extinct skink C. coctei are shared by more than one institution. Museums which host the highest number of threatened and extinct amphibian species are respectively Turin (17 CR and 1 EX), Florence (13 CR and 1 EX), and Trento (15 CR and 1 EW), while for reptiles the richest museums are those from Genoa (15 CR and 1 EX), Florence (11 CR and 1 EX), and Pisa (7 CR). Finally, we discussed the utility of natural history museums and the strategies to follow for the implementation of their functionality.

The European Union (EU) has recently adopted a regulation on invasive alien species that foresees the possibility of developing lists of species of National Concern. We developed a prioritisation process for alien mammals already established in Italy, but not yet included in the EU list (n = 6 species) and a systematic horizon-scanning procedure to obtain ranked lists for those species that are already introduced worldwide or traded in Italy (n = 213). Experts were asked to score these species, by evaluating their likelihood of establishment and spread and the magnitude of their potential impacts on biodiversity, economy, human-health and society. The manageability of each species was also evaluated, both for the proritisation and the horizon-scanning processes. We produced five lists that ranked species according to their potential spread and impacts and their manageability. These will allow policy-makers to select outputs according to a balance between risk assessment and risk management, establishing priorities for alien species management at the national level.

Parathyroid carcinoma (PC) is a rare endocrine neoplasm that typically presents with osteopenia/osteoporosis, nephrolithiasis, asthenia, and neuropsychiatric symptoms. We describe the case of a 48-year-old woman, presenting with a large painful hematoma in the cervicomediastinal area. The neck ultrasound (US) demonstrated a solid lesion measuring 40 × 80 × 55 mm, markedly hypoechoic, which extended from the right thyroid lobe to the mediastinum. The blood tests showed elevated serum calcium and parathyroid hormone (PTH) concentrations, consistent with hypercalcemic primary hyperparathyroidism. The patient was rehydrated and treated with furosemide, cholecalciferol, and bisphosphonate, and underwent right lower parathyroidectomy, right hemithyroidectomy, and lymphadenectomy of the right VI cervical level. Histological examination was diagnostic for nonangioinvasive or neuroinvasive PC, and the thyroid lobe was the site of lymphocytic thyroiditis; all removed lymph nodes were benign. The postoperative course was regular. Postoperative neck US showed a hypoechoic left thyroid lobe without evidence of residual neoplasm in the right thyroid bed. Levothyroxine therapy of 50 mcg/day was started because of serum thyrotropin concentrations elevated at 18 mcIU/mL (normal reference range, 0.35-4.0 mIU/mL). Eight years after diagnosis, the patient is in good general condition, with no clinical, biochemical, or imaging evidence of disease persistence/recurrence. [ABSTRACT FROM AUTHOR]