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首页> 外文期刊>European Journal of Translational Myology >Inductin of DNA fragmentation in rat small intestinal smooth muscle cells by schemia
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Inductin of DNA fragmentation in rat small intestinal smooth muscle cells by schemia

机译:缺血诱导大鼠小肠平滑肌细胞DNA断裂

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Injuries caused by ischemia in the small intestine have been widely accepted as resulting in necrosis. The aim of this study was to ascertain whether apoptosis of intestinal smooth muscle cells (ISMCs) also occurs. For this purpose rat small intestine subjected to ischemia was studied. Apoptosis was assessed by the TUNEL method and by the electrophoretic detection of DNA laddering. Necrosis was evaluated by a -smooth muscle actin monoclonal antibody labeling.ISMCs of the longitudinal layer (LL) were damaged by ischemia, whereas those of the circular layer (CL) were not. ISMCs showing fragmented DNA were first observed after 1.0 hour. Damaged cells showing both DNA laddering and actin labeling were first observed after 3 hours. Agarose gel electrophoresis of DNA confirmed these observations by showing both ladder and smear patterns. Finally, the expression of Bax but not Bcl-2 and Fas in ISMCs increased after ischemia.The present study demonstrated that rat ISMCs subjected to ischemia exhibit both DNA laddering and actin labeling. Apoptosis appears as the initial form of cell death, followed by necrosis. Enhanced expression of Bax may be implicated in this activation of apoptosis.
机译:小肠缺血引起的损伤已被广泛接受,可导致坏死。这项研究的目的是确定是否还会发生肠道平滑肌细胞(ISMC)的凋亡。为此目的,研究了遭受缺血的大鼠小肠。通过TUNEL方法和通过DNA梯形的电泳检测来评估细胞凋亡。通过-平滑肌肌动蛋白单克隆抗体标记评估坏死,纵层(LL)的ISMC受到缺血的损害,而圆层(CL)的则没有。 1.0小时后,首先观察到显示片段化DNA的ISMC。 3小时后,首先观察到同时显示DNA梯形和肌动蛋白标记的受损细胞。 DNA的琼脂糖凝胶电泳通过显示梯形和涂片模式证实了这些观察结果。最后,缺血后ISMC中Bax的表达升高,而Bcl-2和Fas没有升高。本研究表明,缺血后的大鼠ISMC同时具有DNA标记和肌动蛋白标记。凋亡表现为细胞死亡的最初形式,随后是坏死。 Bax的表达增强可能与细胞凋亡的激活有关。

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