来氟米特对肝星状细胞增殖和胶原合成的影响

目的:研究来氟米特活性代谢物A771726对肝星状细胞(HSC)增殖和胶原合成的影响.方法:用链蛋白酶和胶原酶原位肝灌注、Nycodenz密度离心法分离大鼠HSC和Kupffer细胞,制备Kupffer培养上清液(KCCM),并以不同浓度、不同培养时间的CCl4损伤的KCCM作为刺激因素观察了A771726对HSC增殖(3H-TdR掺入法)和胶原合成(3H-Pro掺入法)的影响.ELISA法测定KCCM内TGF-β、TNF-α和IL-1含量.结果:HSC和Kupffer细胞得到较好的分离.CCl4损伤的KCCM显著增加HSC增殖和胶原合成,并且稀释度为1:2的KCCM在培养7 d时,对HSC增殖和胶原合成的刺激作用明显.A771726(0.001～10 μmol/L)对CCl4损伤的KCCM刺激HSC增殖和胶原合成有不同程度的抑制作用,并且A771726(0.001～10 μmol/L)明显抑制CCl4损伤KCCM内升高的TGF-β、TNF-α和IL-1水平.结论:CCl4损伤的KCCM可明显刺激HSC增殖和胶原合成,而A771726对此有明显的抑制作用,并且与其抑制致HSC激活的因子如TGF-β、TNF-α和IL-1分泌有关.

The active metabolite of leflunomide A771726 inhibits proliferation and collagen synthesis of hepatic stellate cell

OBJECTIVE: To investigate the effect of the metabolite of leflunomide, A771726,on proliferation and collagen synthesis of hepatic stellate cell (HSC). METHODS: HSC and Kupffer cells were isolated from the rat liver by collagenase IV and pronase perfusion, and purified by density gradient separation. The effects of A771726 on cell proliferation and collagen synthesis were examined by 3H-thymidine and 3H-proline incorporation assays, respectively. The TGF-beta, TNF-alpha and IL-1 levels in Kupffer cell conditioned medium (KCCM) were determined by enzyme-linked immunosorbent assay (ELISA). RESULTS: HSC and Kupffer cells in rat liver were well separated. The KCCM of CCl4-injured rats had significant stimulation effect on proliferation and collagen synthesis of HSC in primary culture. Addition of A771726 (0.001-10 micromol/Lein HSC culture stimulated by KCCM significantly inhibited proliferation and collagen synthesis of HSC. Furthermore, the elevated TGF-beta, TNF-alpha and IL-1 levels in KCCM of CCl4-injured rats were significantly reduced in A771726 treatment groups. CONCLUSION: A771726 has markedly inhibitory effect on proliferation and collagen synthesis of HSC and secretion of TGF-beta,TNF-alpha and IL-1 from Kupffer cells.