Independence of plasma membrane blebbing from other biochemical and biological characteristics of apoptotic cells

金沢大学医薬保健研究域薬学系Plasma membrane blebs are observed in many types of apoptotic cells, but their physiological roles remain to be clarified. We examined whether there is a causative connection between membrane blebbing and other apoptotic changes in Jurkat cells induced to undergo apoptosis by doxorubicin in the presence or absence of Y-27632, an inhibitor of the Rho kinase ROCK-I. The inclusion of the drug made most membrane blebs disappear, while other changes, such as chromatin condensation, inactivation of mitochondrial enzymes, externalization of the membrane phospholipid phosphatidylserine, and removal of cell surface sialic acid, remained unaffected. Furthermore, these apoptotic cells were phagocytosed by macrophages as efficiently as normally apoptosing cells. These results indicate that blebbing of the plasma membrane occurs independently from other apoptotic changes and is not involved in the recognition and engulfment of apoptotic cells by macrophages

A presumed human nuclear autoantigen that translocates to plasma membrane blebs during apoptosis

金沢大学医薬保健研究域薬学系The structure and subcellular localization of a number of molecules change during apoptosis. These molecules are recognized by the immune system, leading to the development of autoimmunity when apoptotic cells fail to be effectively cleared by phagocytosis. We searched for such molecules by analyzing sera from 12 individuals who suffered from autoimmune diseases and from 3 patients with amyotrophic lateral sclerosis. One serum sample, designated 681, detected an antigen that fulfilled the above criteria. In Western blotting of lysates of human Jurkat T cells, the 681 antigen appeared as a distinct signal with a molecular mass of 60 kDa in normal cells, and 2 additional signals with faster mobilities were detected in apoptotic cells. The results of subcellular fractionation and immunofluorescence experiments revealed this antigen to be strictly localized in the nucleus of normal cells, but to be translocated to a region near the plasma membrane, to membrane blebs in particular, after the induction of apoptosis. Under conditions in which membrane blebbing was inhibited in apoptotic cells, the antigen still moved away from the nucleus, but its accumulation at the periplasmic region was completely abolished. The apparent partial cleavage and intracellular redistribution of the 681 antigen in apoptotic cells mimics changes previously reported for the nuclear autoantigen La, but the 681 antigen was clearly distinct from La. These results suggest that cleavage-dependent exit from the nucleus during apoptosis is a phenomenon common to nuclear autoantigens

Co-existence of acute myeloid leukemia with multilineage dysplasia and Epstein-Barr virus-associated T-cell lymphoproliferative disorder in a patient with rheumatoid arthritis: a case report

Rheumatoid arthritis (RA) is an autoimmune disease mediated by inflammatory processes mainly at the joints. Recently, awareness of Epstein-Barr virus (EBV)-associated T-cell lymphoproliferative disorder (T-LPD) has been heightened for its association with methotraxate usage in RA patients. In the contrary, acute myeloid leukemia with multilineage dysplasia (AML-MLD) has never been documented to be present concomitantly with the above two conditions. In this report we present a case of an autopsy-proven co-existence of AML-MLD and EBV-associated T-LPD in a patient with RA

2017 年度臨地実習におけるルーブリックを用いた看護技術到達度の学生自己評価の報告

報告Reports　学生が卒業までに修得すべき看護技術について、技術内容の評価基準を明確化したルーブリックによる質的な評価表を作成した。学生がルーブリックによる自己評価を記録し教員と共有するICT システムを作成し、臨地実習にて学生の技術到達度の確認と指導に活用した。現状の教育内容の成果と課題を明確にするために、2017 年度秋セメスターから2018 年度春セメスターに行われた臨地実習期間に入力された自己評価データを集計し、学生の技術修得状況を確認した。結果からは、臨地実習や学内演習での繰り返しの実践によって高い到達度評価が得られている技術項目が存在する一方で、臨地実習での実践や経験の機会が限られる項目に関しては、評価のレベルが上がらない傾向がみられた。また臨地実習を進めながらの142 項目の技術評価は学生・教員とも負担が大きく、自己評価の更新頻度を向上させ学生の実態を客観的に把握するためには技術項目の精選による絞り込みが必要と考えられる

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements