Senescence of activated stellate cells limits liver fibrosis.

Senescence of activated stellate cells limits liver fibrosis.
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活化星状细胞的衰老限制了肝纤维化。

DOI:
10.1016/j.cell.2008.06.049
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发表时间:
2008-08-22
期刊:
影响因子:
64.5
通讯作者:
Lowe SW
Lowe SW
中科院分区:
生物学1区
文献类型:
--
作者:
Krizhanovsky V;Yon M;Dickins RA;Hearn S;Simon J;Miething C;Yee H;Zender L;Lowe SW

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细胞衰老是抑制肿瘤的有效机制;然而,其对非癌症病理的功能贡献尚未得到研究。在这里,我们发现衰老细胞在经过治疗的小鼠肝脏中积聚,导致纤维化,这是肝硬化的先兆病理。衰老细胞主要源自活化的肝星状细胞,这些细胞最初响应肝损伤而增殖,并产生沉积在纤维化疤痕中的细胞外基质。在缺乏关键衰老调节因子的小鼠中,星状细胞继续增殖,导致过度肝纤维化。此外,衰老激活的星状细胞表现出与细胞周期退出一致的基因表达谱、细胞外基质成分分泌减少、细胞外基质降解酶分泌增强以及免疫监视增强。因此,自然杀伤细胞在体外和体内优先杀死衰老激活的星状细胞,从而促进纤维化的消退。因此,衰老程序限制了对急性组织损伤的纤维化反应。
Cellular senescence acts as a potent mechanism of tumor suppression; however, its functional contribution to non-cancer pathologies has not been examined. Here we show that senescent cells accumulate in murine livers treated to produce fibrosis, a precursor pathology to cirrhosis. The senescent cells are derived primarily from activated hepatic stellate cells, which initially proliferate in response to liver damage and produce the extracellular matrix deposited in the fibrotic scar. In mice lacking key senescence regulators, stellate cells continue to proliferate, leading to excessive liver fibrosis. Furthermore, senescent activated stellate cells exhibit gene expression profile consistent with cell cycle exit, reduced secretion of extracellular matrix components, enhanced secretion of extracellular matrix degrading enzymes, and enhanced immune surveillance. Accordingly natural killer cells preferentially kill senescent activated stellate cells in vitro and in vivo, thereby facilitating the resolution of fibrosis. Therefore, the senescence program limits the fibrogenic response to acute tissue damage.
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发表时间: 2006-11-30
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