在雌性小鼠中,线粒体的pyruvate载体调节脂肪葡萄糖的分离
Christopher E Shannon1, Terry Bakewell2, Marcel J Fourcaudot2
1UCD Conway Institute, School of Medicine, University College Dublin, Dublin, Ireland; Diabetes Division, Department of Medicine, University of Texas Health San Antonio, San Antonio, TX, USA.
Molecular metabolism
|August 13, 2024
概括
线粒体的酸盐载体 (MPC) 对于脂肪代谢至关重要,特别是在女性身上. 破坏MPC会影响脂肪组织如何使用葡萄糖,揭示性别特异的代谢适应饮食.
科学领域:
- 代谢调节 代谢调节 代谢调节
- 脂肪组织生物学 脂肪组织生物学
- 线粒体功能 线粒体功能
背景情况:
- 线粒体的酸盐载体 (MPC) 是一个关键的代谢调节器.
- 脂肪组织功能障碍是肥胖和心脏代谢疾病的核心原因.
- MPC在脂肪组织适应代谢压力的作用尚不清楚.
研究的目的:
- 研究MPC在脂肪组织代谢中的作用.
- 为了确定MPC是否影响脂肪组织适应饮食挑战.
- 探索脂肪组织内MPC功能中的性别差异.
主要方法:
- 在3T3L1脂肪细胞和小鼠脂肪扩展体中MPC的药理和遗传破坏.
- 在人类脂肪组织中分析MPC表达.
- 在各种饮食条件下,对缺乏脂肪细胞MPC1 (Mpc1) 的小鼠进行了体内研究.
- 使用放射性标记的标记物和GC/MS代谢组分来进行代谢分析.
主要成果:
- 抑制MPC会影响脂质合成和脂肪细胞中的甘油三积累.
- 人类脂肪MPC表达与代谢功能障碍负相关.
- 脂特异性MPC删除损害了pyruvate的纳入到甘油三中.
- 观察到的性别特异性影响:MPC删除限制了雌性小鼠在零脂肪饮食中将葡萄糖转化为甘油三的转化.
- 无论性别或饮食,全身脂肪和代谢健康都保持不变.
结论:
- 与雄性相比,雌性小鼠的脂肪组织具有较高的线粒体驱动的甘油三合成能力.
- 在饮食脂肪限制期间,MPC导入的新陈代谢对于女性脂肪组织中的葡萄糖分离至关重要.
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