Hepatology:脂肪细胞与肝损伤和炎症

2019-04-20 不详 MedSci原创

我们知道,脂肪细胞死亡发生在各种病理生理条件下,包括肥胖和饮酒,特别是在肝脏中,大量脂肪细胞的死亡会引发器官损伤,但潜在的机制仍然模糊不清。为了探索这些机制,研究人员通过在脂肪细胞上过表达人CD59(hCD59)开发了诱导型脂肪细胞死亡的小鼠模型(脂肪细胞特异性hCD59转基因小鼠)。

      我们知道,脂肪细胞死亡发生在各种病理生理条件下,包括肥胖和饮酒,特别是在肝脏中,大量脂肪细胞的死亡会引发器官损伤,但潜在的机制仍然模糊不清。为了探索这些机制,研究人员通过在脂肪细胞上过表达人CD59(hCD59)开发了诱导型脂肪细胞死亡的小鼠模型(脂肪细胞特异性hCD59转基因小鼠)。

      研究人员用中间溶素(ILY)注射这些小鼠,其仅通过与hCD59而非小鼠CD59结合而快速裂解表达hCD59的细胞,导致脂肪细胞的急性选择性死亡,脂肪巨噬细胞浸润和血清游离脂肪酸(FFA)的升高。ILY注射还导致多个器官的继发性损伤,在肝脏中观察到最强的损伤,炎症和肝巨噬细胞明显活化。机制上来解释,急性脂肪细胞死亡会升高肾上腺素和去甲肾上腺素水平,并在趋化因子(C-C基序)受体2阳性(CCR2 +)的脂肪组织中激活脂解途径。另外,急性脂肪细胞死亡引起肝CCR2 +巨噬细胞活化和浸润,进一步加剧肝损伤。

      结论:脂肪细胞死亡主要引起肝损伤和炎症,这可能是由于肝细胞对脂毒性的敏感性和肝脏中巨噬细胞含量明显增加导致的。

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    2019-04-22 gwc384

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