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Effects of angiotensin Ⅱ receptor antagonist Losartan on apoptosis, proliferation and migration of human pancreatic stellate cells
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF PANCREATOLOGY
- Issue:
- 3
- DOI:
- 10.3760/cma.j.issn.1674-1935.2006.03.003
- Key Word:
- 星状细胞;血管紧张素Ⅱ受体拮抗剂;洛沙坦;p38
Abstract： 目的 研究血管紧张素Ⅱ (AngⅡ)1型受体(AT1)拮抗剂洛沙坦(losartan)对人胰腺星状细胞增殖和迁移的影响及其抗胰腺纤维化的作用.方法 组织贴壁法从人胰腺癌组织中原代分离纯化人胰腺星状细胞(hPSC),体外培养10 d后细胞活化.应用放射免疫分析法测定细胞培养上清液和细胞匀浆中AngⅡ的含量,免疫细胞化学和原位杂交方法 检测PSC上的AT1表达.应用AngⅡ(10-8mol/L)和洛沙坦梯度浓度设计多种组合处理PSC细胞.BrdU掺入法和TUNEL法分别检测细胞增殖和凋亡.Wound-healing分析法观察细胞的迁移能力.Real-time PCR、Western blot和免疫荧光方法 检测PSC中Ⅰ型胶原和p38的表达.结果 人PSC存在AT1的表达,而细胞培养上清和细胞匀浆中未能检测到AngⅡ.洛沙坦能够时效和量效性地诱导细胞凋亡(10-5mol/L时最明显),能减轻AngⅡ所导致的细胞迁移和Ⅰ型胶原的分泌,抑制PSC p38的表达.结论 AngⅡ主要依靠旁分泌而并非自分泌途径,通过AT1受体对PSC发挥作用,而洛沙坦通过抑制AngⅡ同AT1结合而发挥抗纤维化效应.
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