JCI:新发现:脂肪激素可以有效逆转非酒精性脂肪肝!

2017-11-07 sunshine2015 来宝网

肥胖流行的不断蔓延带来了一大批疾病。其中一个,特别是在发病率和严重程度方面威胁超过伴随肥胖的许多疾病:非酒精性脂肪肝疾病(NASH)。

脂肪激素与脂肪肝进展的关系可能提出治疗方法的关键】肥胖流行的不断蔓延带来了一大批疾病。其中一个,特别是在发病率和严重程度方面威胁超过伴随肥胖的许多疾病:非酒精性脂肪肝疾病(NASH)。

密歇根大学细胞生物学家林黛莲说:“我认为在未来的几十年里,这将是一个更大的问题,甚至比糖尿病还要严重。”一项新研究的资深作者,密歇根大学的一位研究人员指出。

由U-M领导的国际研究小组发现,增加脂肪激素Neuregulin 4(Nrg4)的水平可以保护肝细胞免受代谢应激的影响。这种激素的丧失有相反的作用;小鼠肝脏恶化,并更快地进展到NASH。

研究结果定于11月6日在“临床研究杂志”上发表,研究人员认为Nrg4可能是治疗干预的有效靶点。

脂肪性肝病代表了一系列疾病,从相对无害的良性脂肪肝到可能危及生命的NASH,导致慢性炎症,肝损伤和纤维化,增加了肝硬化和肝癌的风险。

超过三分之一的美国成年人和10%的儿童患有某种形式的脂肪肝疾病。在多达20%的这些患者中,肝细胞开始死亡,并且疾病发展成NASH。问题在增加。

Lin说:“估计到2020年,NASH将成为肝移植超过肝炎和酒精性肝病的首要原因。”他的实验室位于UM生命科学研究所, UM医学院。目前还没有可以治疗的药物。“

尽管脂肪肝的发生率在不断上升,但科学家并没有清楚地了解在某些患者中肥胖相关的应激状态下细胞是否能保持健康和稳定,以及导致细胞死亡的原因以及NASH进展情况。

为了解决这个问题,Lin和他的同事们评估了Nrg4在喂食导致脂肪肝疾病的高脂肪,高糖饮食类型的小鼠中的作用。

“当激素升高时,我们看到了更少的细胞死亡,更少的炎症,更少的纤维化,”林氏实验室研究员,研究的主要作者梁国说。另一方面,缺乏激素的小鼠的情况更糟糕,这种激素具有明显的功能,可以限制细胞死亡,并防止发展成为最严重的脂肪肝疾病。

这项发现扩展了以前林氏实验室的一项研究,显示Nrg4可以防止肝脏转化为脂肪,从一开始就降低了脂肪肝的风险。

林说:“我们现在看到它进行了两项重大活性。 “它不仅通过减少肝脏脂肪堆积来调节新陈代谢,而且还能保持肝细胞的健康,这样做实际上可以防止进入NASH。

还有更多的好消息:研究人员还没有看到Nrg4增加的小鼠有任何副作用。林的实验室现在集中在进一步测试激素治疗NASH的治疗可行性。

原始出处:

Liang Guo et al. Hepatic neuregulin 4 signaling defines an endocrine checkpoint for steatosis-to-NASH progression, Journal of Clinical Investigation (2017). DOI: 10.1172/JCI96324.

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    2017-11-07 三生有幸9135

    学习一下谢谢分享

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