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Lysophosphatidylethanolamine (LPE) is a bioactive lipid mediator involved in diverse cellular functions. In this study, we investigated the effects of three LPE species, 1-palmitoyl LPE (16:0 LPE), 1-stearoyl LPE (18:0 LPE), and 1-oleoyl LPE (18:1 LPE) on pre-osteoblast MC3T3-E1 cells. All LPE species stimulated cell proliferation and activated the mitogen-activated protein kinase (MAPK)/extracellular signal-regulated kinase (ERK) 1/2. MAPK/ERK1/2 activation by 16:0 LPE and 18:1 LPE was inhibited by the Gq/11 inhibitor YM-254890, while activation by 18:0 LPE was blocked by the Gi/o inhibitor pertussis toxin. Intracellular Ca2+ transients were triggered by 16:0 LPE and 18:1 LPE but not by 18:0 LPE, with YM-254890 suppressing these responses. These results suggest that 16:0 and 18:1 LPE act via Gq/11-coupled G protein coupled receptors (GPCRs), and 18:0 LPE acts via Gi/o-coupled GPCRs. Furthermore, receptor desensitization experiments suggested that each LPE acts through distinct GPCRs. Interestingly, 18:0 LPE suppressed osteogenic differentiation, reducing mineralization, alkaline phosphatase activity, and osteogenic gene expression, whereas 16:0 LPE and 18:1 LPE had no such effects. These results suggest the physiological significance of LPEs in bone formation and indicate that different LPE species and their receptors play distinctive roles in this process. [ABSTRACT FROM AUTHOR]

We aimed to synthesize existing research to elucidate the underlying factors and causes responsible for the high prevalence of unwanted cardiopulmonary resuscitation (CPR) occurring outside a hospital setting in Japan despite patients' Do Not Attempt Resuscitation (DNAR) orders. We conducted a narrative review by searching PubMed, EMBASE, and Scopus for English literature, and Google Scholar for Japanese literature. The key factors we identified included lack of documentation of resuscitation preferences, variation in the perception of other life‐sustaining measures associated with DNAR, non‐inclusion of the patient in discussions of goals of care, unlegislated and unstandardized DNAR orders, emergency medical service activation by the family or facility, the Fire Service Act that mandates life‐saving measures irrespective of the presence of advance directives, fire department protocols and CPR decision‐making, and death pronouncement authorization limited to physicians. This study identified the multifaceted factors and the potential triggers for unwanted CPR despite DNAR orders. These findings underscore the urgent need for comprehensive interventions encompassing educational initiatives, ethical considerations, systemic reforms, and legal adjustments to prevent future unwanted CPRs in Japan. Geriatr Gerontol Int 2024; 24: 1093–1098. [ABSTRACT FROM AUTHOR]

Background: Two-dimensional digital subtraction angiography (2D-DSA) and conventional three-dimensional digital subtraction angiography (3D-DSA) are used for the detailed analysis of dural arteriovenous fistula (DAVF). Recently, four-dimensional digital subtraction angiography (4D-DSA), a novel technology, has been attracting attention. The current study aimed to evaluate the capability of 4D-DSA in assessing anatomical angioarchitecture in DAVF. Methods: In total, 10 consecutive patients with DAVF who underwent 3D-DSA and 4D-DSA at a single institution were included in the analysis. Initially, one-slice multiplanar reconstruction (MPR) images obtained via 4D-DSA and 3D-DSA were compared to investigate the visibility of the feeding artery, fistulous point, and draining vein. Next, 4D-DSA images alone were compared and evaluated with and the MPR images of conventional 3D-DSA in terms of diagnosis of the angioarchitecture. Results: In total, six men and four women (with a mean age of 65.6 ± 10.0 years) were included in the study. The MPR image obtained via 3D-DSA had a significantly better visibility of the feeding artery and fistulous point than that acquired via 4D-DSA (p < 0.05). As for the draining vein, the score was equivalent and not significant. The diagnosis of the vascular architecture of only 4D-DSA images was nearly equivalent to that of MPR images of 3D-DSA. There were no inter-rater differences. Conclusion: The MPR images obtained via 4D-DSA may be slightly inferior to those acquired via 3D-DSA in identifying fine angioarchitecture in DAVF. However, they were comparable in terms of diagnostic accuracy. [ABSTRACT FROM AUTHOR]

Bacterial pathogens utilize the factors of their hosts to infect them, but which factors they exploit remain poorly defined. Here, we show that a pathogenic Salmonella enterica serovar Typhimurium (STm) exploits host polyamines for the functional expression of virulence factors. An STm mutant strain lacking principal genes required for polyamine synthesis and transport exhibited impaired infectivity in mice. A polyamine uptake-impaired strain of STm was unable to inject effectors of the type 3 secretion system into host cells due to a failure of needle assembly. STm infection stimulated host polyamine production by increasing arginase expression. The decline in polyamine levels caused by difluoromethylornithine, which inhibits host polyamine production, attenuated STm colonization, whereas polyamine supplementation augmented STm pathogenesis. Our work reveals that host polyamines are a key factor promoting STm infection, and therefore a promising therapeutic target for bacterial infection. Bacterial pathogens often exploit host factors to enhance their infectivity. This study shows that Salmonella Typhimurium boosts host polyamine production, which is crucial for the expression and needle assembly of its type 3 secretion system. [ABSTRACT FROM AUTHOR]

The special issue of the International Journal of Molecular Sciences focuses on the role of polyamines in aging and disease. Polyamines are essential for cellular functions, and imbalances in their metabolism are linked to age-related diseases and cancer. The issue covers topics such as the potential of polyamines as biomarkers, the impact of polyamine intake on aging, and the role of polyamines in various pathologies. Authors discuss the therapeutic potential of targeting polyamine metabolism in cancer treatment and prevention. The issue aims to deepen understanding of the relationship between polyamines and aging and disease, offering insights into potential interventions to extend healthy lifespans. [Extracted from the article]

Context: While in-person workshops on serious illness communication skills using VitalTalk pedagogy have been shown to have a long-lasting impact, whether changing the format into virtual would maintain its enduring impact is unknown. Objectives. To examine long-term impacts of a virtual VitalTalk communication workshop. Methods: Physicians in Japan who participated in our virtual VitalTalk workshop were asked to complete a self-assessment survey at 3 time points: before, immediately after, and 2 months after the workshop. We examined self-reported preparedness in 11 communication skills on a 5-point Likert scale at 3 time points, as well as self-reported frequency of practice on 5 communication skills at the pre- and 2-month time points. Results: Between January 2021 and June 2022, 117 physicians from 73 institutions across Japan completed our workshop. Seventy-four participants returned the survey at all the 3 time points. Their skill preparedness significantly improved upon the completion of the workshop in all 11 skills (P <.001 for all items). The improvement remained at the same level at 2 months in 7 skills. In 4 of the 11 skills, there was further improvement at the 2-month point. The frequency of self-directed skill practice also increased significantly in the 2-month survey for all 5 skills. Conclusion: A virtual workshop of VitalTalk pedagogy improved self-reported preparedness of communication skills, and the impact was long-lasting in a non-U.S. setting as it likely induced self-practice of skills. Our findings encourage the use of a virtual format in any geographical location considering its enduring impact and easy accessibility. [ABSTRACT FROM AUTHOR]