通过Gi/o-合受体调节外细胞形成的代谢调节的性别差异
Montana Young1, Ryan P Ceddia2, Analisa Thompson-Gray1
1Department of Pharmacology, School of Medicine, Vanderbilt University, Nashville, TN, United States.
Frontiers in pharmacology
|April 3, 2025
概括
雌性SNAP25Δ3小鼠表现出持续的代谢保护,防止饮食诱导的肥胖,即使在热中立状态下. 这种保护独立于性激素,表明一种新的调节途径.
科学领域:
- 神经科学是一个神经科学.
- 代谢研究研究 代谢研究
- 内分泌学 在内分泌学.
背景情况:
- 预突触G$_{i/o}$结合的GPCRs通过Gβγ效应器调节神经递质释放,抑制流入和膜融合.
- SNAP25Δ3突变破坏了Gβγ-SNARE相互作用,消除了神经递质释放的制动.
- 雄性SNAP25Δ3/Δ3小鼠在室温下表现出代谢保护 (脂肪化,葡萄糖吸收,胰岛素敏感性),但在热中性时失去它.
研究的目的:
- 在热中立状态下,研究SNAP25Δ3/Δ3小鼠的持续代谢保护的性别依赖机制.
- 确定性激素是否影响观察到的代谢表型.
- 探索环境温度对基本代谢率的影响.
主要方法:
- 雄性和雌性小鼠在室温 (21°C) 或热中性 (30°C) 条件下养,并食高脂肪饮食 (HFD) 8周.
- 进行葡萄糖耐受性测试,身体成分分析,器官剖析和免疫组织化学.
- 在雌性小鼠中进行了卵巢切除,并在Sable Promethion腔室中进行了代谢率测量.
主要成果:
- 雌性SNAP25Δ3/Δ3小鼠在室温下表现出对DIO的代谢保护,并且在热中性状态下持续存在.
- 在基因型之间没有观察到热中性设定点的性别依赖差异.
- 在经过卵巢切除的雌性SNAP25Δ3/Δ3小鼠中,代谢保护仍然存在.
结论:
- 在小鼠的热中性设定点中,没有取决于性别的差异.
- 一个独立于性激素的机制驱动了女性SNAP25Δ3/Δ3小鼠在热中立状态下持续的代谢保护.
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