大麻素受体1型 (CB1R) 通过与TC-PTP和STAT3复合,通过β-arrestin1抑制下丘脑中瘦素信号传递
Gergő Szanda1,2, Tony Jourdan3, Éva Wisniewski1
1Department of Physiology, Semmelweis University Medical School, 1094 Budapest, Hungary.
iScience
|August 3, 2023
概括
大麻素受体1 (CB1R) 的激活抑制了在下丘脑中的勒普丁信号传递. 这涉及β-arrestin1和TC-PTP,影响代谢控制.
科学领域:
- 神经内分泌学神经内分泌学
- 分子生物学分子生物学
- 代谢调节 代谢调节 代谢调节 代谢调节
背景情况:
- 莱普和内分泌大麻素具有相反的代谢作用.
- 它们的分子相互作用,特别是在下丘脑,还没有完全理解.
- 了解这些相互作用对于代谢疾病研究至关重要.
研究的目的:
- 阐明大麻素受体1 (CB1R) 激动剂抑制大脑下丘脑中白诱导的STAT3信号传递的分子机制.
- 为了确定参与这种抑制交叉对话的关键分子参与者.
主要方法:
- 使用的小鼠模型,包括对beta-arrestin1.1.的淘汰小鼠.
- 采用半自动共焦显微镜测量培养神经元中的STAT3激活.
- 研究了蛋白质-蛋白质相互作用和亚细胞局部化 (例如,β-arrestin的核转位1).
主要成果:
- CB1R激动剂降低了在下丘脑神经元中叶丁诱导的STAT3信号传递.
- 这种抑制需要T细胞蛋白氨酸酸酶 (TC-PTP) 和β-arrestin1.
- CB1R的激活导致β-arrestin1的核转位,与STAT3和TC-PTP结合.
- 该机制独立于cAMP的变化.
- 缺少CB1R,β-arrestin1,或TC-PTP会废除抑制作用.
结论:
- CB1R激活利用β-arrestin1来招募TC-PTP,抑制叶黄素引起的STAT3信号传递.
- 这种途径可能会限制勒普丁在强烈的内分泌卡纳比诺伊德信号传递 (例如,禁食,肥胖) 期间的厌食效应.
- 为刺激食欲和抑制食欲的途径之间的相互作用提供了分子基础.
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