Hepatology:乳脂球–表皮生长因子–因子8可以改善肝脏的脂肪变性和炎症水平

2021-04-09 MedSci原创 MedSci原创

非酒精性脂肪肝疾病(NAFLD)是一种特殊的肝脏疾病,在过去的几十年中,全世界的肥胖发生率越来越高导致了NAFLD的大量激增。

      非酒精性脂肪肝疾病(NAFLD)是一种特殊的肝脏疾病,在过去的几十年中,全世界的肥胖发生率越来越高导致了NAFLD的大量激增。这种慢性病影响了全球25%以上的人并正在成为发病率最高的肝脏疾病。NAFLD可以分为脂肪肝阶段和肝炎阶段,而且大大增加了进一步发展肝脏和肝外并发症的风险。不幸的是,非酒精性脂肪性肝炎(NASH)的治疗还很有限。

 

      最近有研究发现乳脂球–表皮生长因子–因子8(MFGE8)是在非酒精性脂肪肝疾病(NAFLD)病理过程中介导凋亡信号传导的重要细胞外分子。越来越多的证据表明MFGE8参与了机体的生理和病理生理过程,包括免疫和炎症反应,器官稳态,组织修复和重塑和创伤相关凝血病等。但尚未明确其在NAFLD发病机理中的功能。因此,本项研究对此进行了相关研究。

 

      在本项研究中,研究人员发现肝脏中MFGE8的水平在NAFLD的发病机理中显示出保护作用。肝MFGE8缺失在很大程度上加剧了肝脏对营养过剩的脂质积累和炎症反应。从机制上讲,在正常饮食下,细胞间MFGE8可直接与凋亡信号调节激酶1(ASK1)结合并抑制其二聚化和磷酸化。但是,在代谢不良的状况下,细胞质MFGE8的减少促进了ASK1的二聚化和磷酸化以及随后肝细胞中促分裂原激活的蛋白激酶信号转导,从而导致肝脏疾病的恶化。

图:MFGE8含量与肝脏炎症的影响

      由此,研究人员证实肝脏中的MFGE8是一种内源性抑制剂,可阻止肝脂肪变性和炎症的发展。因此,提高肝MFGE8水平可作为NAFLD治疗的替代策略。

 

 

原始出处:

Lei Zhang. Et al. Milk Fat Globule–Epidermal Growth Factor–Factor 8 Improves Hepatic Steatosis and Inflammation. Hepatology.2021.

 

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    2021-06-19 西大夫

    0

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    2021-04-11 gwc384
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    2021-04-11 huangdf
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    2021-04-09 ms5000000892437705

    感谢好文!

    0

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