过度活跃的mTORC1/4EBP1信号失调蛋白质稳定,加速心脏衰老
Weronika Zarzycka1,2, Kamil A Kobak1, Catherine J King1
1Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.
GeroScience
|October 8, 2024
概括
拉巴胺复合体1 (mTORC1)/4E结合蛋白1 (4EBP1) 轴的过度活跃的机械标加速了心脏衰老. 这种加速衰老与蛋白质稳定性受损有关,影响小鼠的心脏功能和表现.
科学领域:
- 心血管生物学 心血管生物学
- 衰老研究研究 衰老研究
- 分子生物学分子生物学
背景情况:
- 拉巴胺素复合体1 (mTORC1) 信号传递的机械标在衰老和与年龄相关的疾病中过度激活.
- 在老化过程中,mTORC1调节蛋白质稳定,这一过程对细胞健康至关重要.
- 拉巴胺素部分抑制mTORC1可以逆转与年龄相关的小鼠心脏衰退.
研究的目的:
- 研究mTORC1/4EBP1信号轴在与年龄有关的心脏功能障碍中的作用.
- 了解mTORC1/4EBP1在心脏衰老中的下游途径.
主要方法:
- 使用全身4EBP1淘汰赛 (KO) 鼠标模型模拟过度活跃的mTORC1/4EBP1/eIF4E轴.
- 在中年和老年4EBP1KO和野生类型 (WT) 小鼠中,进行了心声回声测试,以评估心脏功能 (心缩和心放).
- 分析了心力衰竭标记物的基因表达,核糖体生物发生和心脏组织中的蛋白质无处不在.
主要成果:
- 4EBP1 KO小鼠表现出腹功能和心肌性能受损,与年龄相匹配的WT小鼠相比,这表明心脏衰老加速.
- 旧的4EBP1KO小鼠表现出缩和透缩功能的进一步恶化.
- 在4EBP1KO心脏中观察到增加的核糖体生物发生和蛋白质无化,这表明蛋白质稳定性失调.
结论:
- 一个过度活跃的mTORC1/4EBP1轴在小鼠中加速心脏衰老.
- 这种加速的心脏衰老可能是由蛋白质稳定性失调驱动的.
- mTORC1/4EBP1通路是缓解与年龄有关的心脏功能障碍的潜在治疗标.
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