脂肪特异性GHR删除减轻了老年小鼠的大脑衰老和认知衰退
Yue Zhang1,2, Rui Ma3,4, Jia He2
1Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Ophthalmology & Visual Science Key Laboratory, Beijing, China.
Aging cell
|February 13, 2026
概括
准脂肪组织中的生长激素 (GH) 信号可能会对抗大脑衰老. 删除脂肪中的GH受体改善了小鼠的认知能力并减少了大脑衰老标志物,这表明了一种新的治疗方法.
科学领域:
- 神经科学是一个神经科学.
- 内分泌学 在内分泌学.
- 老年学是一门学科.
背景情况:
- 大脑衰老涉及神经元损失,突触损伤,神经炎症和蛋白质积累,导致认知能力下降.
- 系统性减少生长激素 (GH) /胰岛素类生长因子-1 (IGF-1) 信号可能会延长寿命并改善认知能力.
- 关于大脑衰老的脂肪组织内GH信号传递的具体作用尚不清楚.
研究的目的:
- 研究脂肪特异性GH受体缺失对大脑衰老和小鼠认知功能的影响.
- 为了确定脂肪组织中GH信号是否作为大脑衰老的外围调节器.
主要方法:
- 使用了老年脂肪特异性GH受体淘汰 (Ad-GHRKO) 小鼠和对照 littermates (18-24个月大).
- 评估大脑衰老标志物,包括神经元损失,神经炎症,细胞衰老和陶酸化.
- 评估了突触完整性 (PSD95表达) 和神经元刺激性.
- 使用新型对象识别,Y迷宫,莫里斯水迷宫和被动回避任务测试认知表现.
主要成果:
- 在Ad-GHRKO小鼠中,皮质和海马体的神经元损失减少.
- 在老年Ad-GHRKO小鼠中,神经炎症,细胞衰老和陶酸化减少.
- 在Ad-GHRKO小鼠中,突触完整性和皮质神经元刺激性被保留.
- Ad-GHRKO小鼠在识别,工作,空间和恐惧记忆方面表现出显著的改善.
结论:
- 脂肪组织的GH信号传递是以前未被识别的脑衰老的外围调节器.
- 在脂肪组织中删除GH受体减弱了大脑衰老的关键特征,并改善了认知功能.
- 脂肪性GH受体代表了缓解与年龄相关的认知衰退的潜在治疗标.
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