Cell Death Dis:烧伤后脂肪褐变引发肝脂肪变

2019-11-23 QQY MedSci原创

烧伤患者会经历体内高代谢,进而会出现肝脂肪变性,这与受伤后发生肝衰竭及不良预后有关。而且烧伤患者还会经历白色脂肪组织(WAT)褐色变,这与烧伤后的恶病质调节和持续的高代谢有关。尽管烧伤后常出现肝脂肪变性和WAT褐色变两种临床表现,但对其潜在机制仍知之甚少。在本研究中,研究人员发现烧伤所引起的WAT褐色变及其相关的脂解作用的增加会导致小鼠肝脂肪变性的加速进展。敲除白介素6(IL-6)和解偶联蛋白1(

烧伤患者会经历体内高代谢,进而会出现肝脂肪变性,这与受伤后发生肝衰竭及不良预后有关。而且烧伤患者还会经历白色脂肪组织(WAT)褐色变,这与烧伤后的恶病质调节和持续的高代谢有关。尽管烧伤后常出现肝脂肪变性和WAT褐色变两种临床表现,但对其潜在机制仍知之甚少。

在本研究中,研究人员发现烧伤所引起的WAT褐色变及其相关的脂解作用的增加会导致小鼠肝脂肪变性的加速进展。敲除白介素6(IL-6)和解偶联蛋白1(UCP1)——烧伤诱导的WAT褐色变的调节剂——可完全预防小鼠烧伤后的肝脂肪变性。用普萘洛尔或IL-6受体阻滞剂治疗烧伤小鼠,可减轻烧伤所引起的WAT褐色变及相应的肝脂肪变性。对烧伤后的小鼠和烧伤患者血浆中的脂质组学分析发现,损伤诱导性脂质(棕榈酸和硬脂酸)的水平升高,这些脂质可诱导肝内质网(ER)应激并影响肝脂肪的氧化。

机制上,结果显示烧伤后的肝内质网应激反应会导致更多的内质网线粒体相互作用、肝细胞凋亡、氧化应激以及脂肪氧化损伤。总而言之,本研究揭示了烧伤后脂肪与肝组织之间的不良“串扰”,且其相互作用是由WAT褐色变所介导的。

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    2020-03-07 维他命
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    2019-11-25 cy0328

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