摘要
目的 毒性剂量H2 O2 可引起细胞坏死或凋亡 ,此过程是否与H2 O2 引起的核 [Ca2 +]([Ca2 +]n)变化有关未见报导。本文研究牛磺酸对H2 O2 引起的血管平滑肌细胞(VSMC) [Ca2 +]n 与胞浆 [Ca2 +]([Ca2 +]c)的变化影响。方法 应用激光共聚焦显微镜对负载Fluo 3的培养大鼠VSMC的 [Ca2 +]n 及 [Ca2 +]c 变化进行研究。结果 在0 5 %H2 O2 作用下 ,[Ca2 +]n 与 [Ca2 +]c 持续升高 ,用抗氧化细胞保护剂 牛磺酸 2 0mmol·L-1预处理细胞 ,可降低H2 O2 引起的 [Ca2 +]n升幅 (P <0 0 5 ) ,但不影响 [Ca2 +]c 升幅 (P >0 0 5 ) ,表明 [Ca2 +]n 变化与 [Ca2 +]c 变化对牛磺酸反应性存在差异。结论 VSMC的核Ca2 +调控与胞浆Ca2 +调控各自具有一定的独立性。牛磺酸对H2 O2 引起的大鼠VSMC核Ca2
AIM As one of the reactive oxygen species, toxic dose of H 2O 2 leads to the necrosis or apoptosis of many kinds of cells. It is nuclear whether these processes are related with the changes of nuclear Ca 2+ elicited by H 2O 2. This study on the effect of taurine on changes of nuclear and cytosolic (Ca 2+ ) elicited by H 2O 2 in rat vascular smooth muscle cells. METHODS The techniques of Fluo 3 and laser scanning confocal microscopy were used. RESULTS Rapid and sustaining rise of nuclear [Ca 2+ ] ([Ca 2+ ] n) and cytosolic [Ca 2+ ]([Ca 2+ ] c) were found in cultured rat vascular smooth muscle cells upon adding of 0 5% H 2O 2. Pretreatment of the cells with 20 mmol·L -1 taurine, a regulator of cellular Ca 2+ homestasis, significantly decreased the rise amplitude of [Ca 2+ ] n ( P <0 05), but failed to affect that of [Ca 2+ ] c ( P >0 05) elicited by H 2O 2. It was suggested that the changes of [Ca 2+ ] n and [Ca 2+ ] c have different respond to taurine. CONCLUSION It was concluded that there exist the independent regulating mechanisms of Ca 2+ in the nucleus from differences between the nucleus and cytosol Ca 2+ in sensitivity to action of H 2O 2 and taurine.
出处
《中国药理学通报》
CAS
CSCD
北大核心
2001年第1期89-91,共3页
Chinese Pharmacological Bulletin
