Cell Metab:基因改造老鼠吃不胖

2014-08-06 佚名 生物谷

基因改造小鼠,使其缺乏特定基因SEL1L,当喂食一个典型的高脂肪、会诱发肥胖的饲料后,不会诱发此小鼠长胖。然而,正常老鼠给予同样饮食,会肥胖。相关研究结论发表在Cell Metabolism杂志上。 对小鼠脂肪细胞进行基因工程改造,使其缺乏SEL1L基因,可防治小鼠肥胖。SEL1L基因已知参与清除细胞内质网(ER)内错误折叠的蛋白质。当错误折叠的蛋白质不能被清除,会累积、破坏细胞,并引发

基因改造小鼠,使其缺乏特定基因SEL1L,当喂食一个典型的高脂肪、会诱发肥胖的饲料后,不会诱发此小鼠长胖。然而,正常老鼠给予同样饮食,会肥胖。相关研究结论发表在Cell Metabolism杂志上。

对小鼠脂肪细胞进行基因工程改造,使其缺乏SEL1L基因,可防治小鼠肥胖。SEL1L基因已知参与清除细胞内质网(ER)内错误折叠的蛋白质。当错误折叠的蛋白质不能被清除,会累积、破坏细胞,并引发疾病如疯牛病,1型糖尿病和囊肿性纤维化等。

本研究想解决的问题是,为什么脂肪细胞缺乏SEL1L基因的老鼠不会发胖?这是否与此类小鼠无法清除ER错误折叠的蛋白质有关?研究发现:脂肪细胞缺乏SEL1L小鼠会出现一系列其他问题,包括餐后高甘油三酯血症,其特点是小鼠进食后出现高水平的甘油三酯。

虽然目前还没有发现高甘油三酯血症是否对小鼠瘦小有“贡献”,但研究发现,脂肪细胞缺乏SEL1L小鼠有“脂质分布”缺陷,即此类小鼠的脂肪细胞不能储存脂肪,结果脂肪会进入到肝脏中。在研究其中机制时,研究人员发现SEL1L的一个新功能,就是脂质代谢的调节因子。

我们很高兴地发现,对于脂蛋白脂酶(LPL)在细胞内的运输,SEL1L是一种必需的酶。如果没有LPL,脂类分子会停留在血液循环中,脂肪细胞和肌肉细胞不能吸收脂肪分子,用于储存和能量燃烧。许多LPL基因突变个体,会发展患有餐后高甘油三酯血症,此症状类似于脂肪细胞特异性SEL1L缺陷小鼠进食后的高甘油三酯血症。

今后的研究工作将调查SEL1L在LPL基因突变个体中的作用,并确定为什么在高脂肪、会诱发肥胖的饲料饲养下,脂肪细胞特异性SEL1L缺陷小鼠不会肥胖。

原始出处:

Sha H1, Sun S2, Francisco AB3, Ehrhardt N4, Xue Z1, Liu L1, Lawrence P1, Mattijssen F5, Guber RD1, Panhwar MS6, Brenna JT1, Shi H7, Xue B7, Kersten S8, Bensadoun A1, Péterfy M9, Long Q10, Qi L11.The ER-Associated Degradation Adaptor Protein Sel1L Regulates LPL Secretion and Lipid Metabolism.Cell Metab. 2014 Jul 23. pii: S1550-4131(14)00307-6. doi: 10.1016/j.cmet.2014.06.015. [Epub ahead of print]

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    2015-05-27 维他命
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    2015-03-29 一闲
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    2015-01-09 summeryan

    肥胖研究,基因调控

    0

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