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Toxicity effect of islet amyloid fibril on cytomembrane of islet cells in vitro
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF DIABETES
- Issue:
- 7
- DOI:
- 10.3321/j.issn:1006-6187.2007.07.018
- Key Word:
- 胰淀素;胰岛淀粉样多肽;胰岛细胞;膜流动性
Abstract： 目的 探讨胰岛淀粉样多肽(IAPP,也称胰淀素Amylin)的纤维状态胰岛淀粉样纤维(IAf)对胰岛细胞膜的毒性作用及可能机制.方法 比较用可溶性IAPP和IAf孵化培养的胰岛细胞膜流动性的变化,并在黏附细胞仪570记录各组[Ca2+]i的动态变化;以10μmol/L IAf组为对照组,分别比较Ca2+通道阻断剂组、无Ca2+培养液组、胆固醇干预组[Ca2+]i的动态变化,了解[Ca2+]i变化与钙离子通道的关系.结果 细胞膜流动性和[Ca2+]i在IAf组中呈剂量依赖性升高,与可溶性IAPP组及空白对照组比较差异有统计学意义(P＜0.01);而可溶性IAPP组与空白对照组间差异无统计学意义(P＞0.05).Ca2+通道阻断剂预处理组加10μmol/L IAf刺激后[Ca2+]i变化与对照组相比差异无统计学意义(P＞0.05),而无Ca2+培养液组和胆固醇预处理组加10μmol/L IAf 刺激后[Ca2+]i变化均明显低于对照组(P＜0.01).结论 IAf可能通过改变胰岛细胞膜流动性和细胞内钙超载而导致细胞损伤,钙超载是由于外钙内流所致,其途径可能并非经过钙离子通道,可能与"淀粉样通道"形成有关.胆固醇具有拮抗此毒性的作用.
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