Am J Pathol:研究者发现细胞衰老与肝纤维化的关系

2017-11-17 佚名 药明康德

据美国酒精滥用与成瘾研究所(National Institute on Alcohol Abuse and Alcoholism)的调查,在2015年,美国8万名因肝病死亡的人中有将近一半与酒精性肝病(ALD)有关。长期饮酒导致肝细胞脂肪异常积累(脂肪变性)和肝纤维化,这可能会导致肝炎、肝硬化甚至肝癌。近日,一项发表在《The American Journal of Pathology》的新研究提

据美国酒精滥用与成瘾研究所(National Institute on Alcohol Abuse and Alcoholism)的调查,在2015年,美国8万名因肝病死亡的人中有将近一半与酒精性肝病(ALD)有关。长期饮酒导致肝细胞脂肪异常积累(脂肪变性)和肝纤维化,这可能会导致肝炎、肝硬化甚至肝癌。近日,一项发表在《The American Journal of Pathology》的新研究提供了关于细胞衰老的新见解,探讨了它引发肝脏过度纤维化的机制,以及能抑制这些变化的手段,该论文有潜力为ALD患者带来新疗法。

“我们相信在慢性肝损伤中,细胞衰老与年龄相关的组织退化有关,”论文共同作者之一,美国德克萨斯州Texas A&M College of Medicine的内科副教授Fanyin Meng医学博士说:“细胞衰老指的是一种不可逆的细胞周期停滞,加上促炎性细胞因子的分泌以及肝细胞功能的障碍。我们的研究表明,细胞衰老的驱动因素也是ALD的关键介质。”

研究者检查了来自于重度饮酒的脂肪性肝炎患者的肝脏组织,以及用乙醇喂养的小鼠的肝脏组织,以确定细胞衰老的生物标志物。结果表明,在饮用酒精时,microRNA-34a(miR-34a)的上调会促进酒精性肝损伤期间肝纤维化的发展。 MiR-34a的促纤维化作用与两种不同类型肝细胞中的老化信号传导有关:在占70-85%肝脏质量,执行肝脏基本功能的原发性肝细胞中,细胞衰老增加;而肝星状细胞(HSC)中,在被酒精或其它肝脏损伤触发而活化,让细胞开始产生过量的纤维化物质的情况下,细胞衰老减少。他们的研究还表明,抑制肝脏miR-34a的表达,能减少ALD中的肝脏损伤和肝纤维化。

这项研究确定了HSC活化的调节途径,有潜力应用于其他与细胞衰老相关的肝脏纤维化疾病。论文共同作者Gianfranco Alpini博士评论说:“靶向衰老和细胞衰老的驱动因子,有潜力成为新的治疗方法,用来降低ALD患者的肝脂肪变性和肝纤维化。”

原始出处:

Ying Wan,et al.,Regulation of Cellular Senescence by miR-34a in Alcoholic Liver Injury.Am J Pathol. November 8, 2017.

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    2019-01-08 kafei

    学习了谢谢

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    2018-05-22 stfoxst
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    2017-12-25 docwu2019
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