甲状腺刺激激素通过内质网膜应激诱导脂肪细胞中的胰岛素抵抗
Qing Zhou1, Li Yong Zhang2, Mei Feng Dai3
1Department of Endocrinology, Fujian Maternity and Child Health Hospital, Fujian Children's Hospital, Fuzhou, China.
甲状腺刺激激素 (TSH) 通过激活内网膜 (ER) 应激和JNK通路,直接导致脂肪细胞的胰岛素抵抗. 这个过程会损害葡萄糖的吸收,并且可以通过阻断ER压力来逆转.
科学领域:
- 内分泌学 在内分泌学.
- 代谢性疾病研究研究
- 细胞生物学 细胞生物学
背景情况:
- 亚临床甲状腺功能低下症 (SCH) 与胰岛素抵抗有关.
- 甲状腺刺激激素 (TSH) 是SCH相关胰岛素抵抗的一个独立因素.
研究的目的:
- 研究TSH水平如何影响脂肪细胞中的胰岛素信号转导.
- 确定内细胞网膜 (ER) 应激在TSH诱导的胰岛素抵抗中的作用.
主要方法:
- 建立了一个亚临床甲状腺功能低下症小鼠模型.
- 用TSH或突尼卡米辛 (TM) 处理的3T3-L1脂肪细胞,有或没有4 - 酸 (4-PBA).
- 分析了葡萄糖耐受性,胰岛素信号通路 (IRS-1/AKT, IRE1/JNK) 和ER压力标志物.
主要成果:
- SCH小鼠显示葡萄糖耐受性受损,IRS-1/AKT无活化和IRE1/JNK激活,所有这些都得到了4-PBA的改善.
- 在脂肪细胞中TSH治疗降低了葡萄糖吸收,IRS-1氨酸酸化,AKT酸化和GLUT4表达.
- TSH诱导了TNF-α,IL-6和ER压力标志物,效应被4-PBA逆转.
结论:
- 在脂肪细胞中,TSH会诱导胰岛素抵抗.
- 该机制涉及ER压力和JNK通路,破坏胰岛素信号传导.
- 阻断ER压力可以缓解TSH诱导的胰岛素抵抗.
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