HSP47在TGF-β1诱导肝星形细胞合成I型胶原蛋白中的作用

目的：探讨热休克蛋白47对转化生长因子β1（transforming growth factorβ1,TGF-β1）所诱导的肝星形细胞合成Ⅰ型胶原蛋白的影响。方法：以重组人1ng/mL和10ng/mL TGF-β1作用于培养的肝星形细胞株HSC-T6,采用热休克反应（heat shock response,HSR）（42℃孵育1h,37℃分别恢复6h,12h,24h,48h）和HSP47反义寡核苷酸分别诱导或抑制HSP47的表达,采用免疫印迹技术检测HSP47及Ⅰ型胶原蛋白的合成。采用MTT法检测细胞存活力。结果：正常状态下,HSC-T6细胞均表达一定量的HSP47和Ⅰ型胶原蛋白;1ng/mL和10ng/mL TGF-β1处理24h均能诱导Ⅰ型胶原蛋白表达,其中以10ng/mL的作用最为明显,同时TGF-β1刺激后也能诱导HSP47的表达。HSR在诱导HSP47表达的同时虽然不能改变Ⅰ型胶原蛋白的合成,却能促进TGF-β1诱导的Ⅰ型胶原蛋白合成。HSP47反义寡核苷酸在不影响细胞存活力的情况下,能显著抑制HSR诱导的HSP47的表达以及TGF-β1诱导的Ⅰ型胶原蛋白的表达。结论：HSP47的高表达能增强TGF-β1诱导的Ⅰ型胶原蛋白合成,可能在肝纤维化的发生发展过程中发挥重要作用。

Effect of heat shock protein 47 on the expression of collagen I induced by TGF-beta(1) in hepatic stellate cell-T6 cells]

OBJECTIVE: To determine the effect of heat shock protein 47 (HSP47) on the expression of collagen I induced by transforming growth factor beta(1) (TGF-beta(1)) in hepatic stellate cell-T6 (HSC-T6) cells. METHODS: We used 1 ng/mL and 10 ng/mL recombinant human TGF-beta(1) to stimulate the cultured HSC-T6 cells. Heat shock response (HSR) and antisense oligonucleotides of HSP47 were used to induce and block the expression of HSP47, respectively. The expressions of HSP47 and collagen I were detected by Western blot and the cell viability was observed by MTT assay. RESULTS: Both HSP47 and collagen I were expressed in normal HSC-T6 cells. Collagen I and HSP47 expression could be induced by both 1 ng/mL and 10 ng/mL TGF-beta(1) and collagen I was expressed the most after the treatment with 10 ng/mL TGF-beta(1). Although HSR could not affect the synthesis of collagen I as it induced the HSP47 expression, HSR could promote the expression of collagen I induced by TGF-beta(1). With no effect on the cell viability, antisense oligonucleotides could significantly inhibit HSR-mediated HSP47 expression and TGF-beta(1)-induced collagen I synthesis. CONCLUSION: Over-expression of HSP47 enhances TGF-beta(1)-induced expression of collagen I in HSC-T6 cells, and HSP47 may play important roles in the process of hepatic fibrosis.