低剂量外周瘦素输液产生选择性激活中腹下丘脑和后脑STAT3的选择性激活
1Center for Neuroinflammation and Cardiometabolic Disease, Georgia State University, Atlanta, Georgia, United States.
概括
在老鼠中,慢性丁注入通过激活特定的大脑区域来抑制食物摄入和体重增加. 中腹下丘脑 (VMH) 和孤独通道 (NTS) 的核显示信号传感器和转录3 (STAT3) 激活器的激活,这表明它们在食欲和新陈代谢中发挥着不同的作用.
科学领域:
- 神经内分泌学神经内分泌学
- 代谢调节 代谢调节 代谢调节
- 控制食欲,控制自己的食欲.
背景情况:
- 莱普在食欲调节中的作用是复杂的,急性注射激活了弧形核 (ARC) 信号传感器和转录3 (STAT3) 激活器.
- 慢性瘦素的使用,与急性注射不同,导致对体重和食物摄入的持续影响,在下丘脑中具有不同的STAT3激活模式.
研究的目的:
- 在老鼠慢性外周瘦素输液后,研究下丘脑和后脑核中STAT3激活的模式.
- 为了确定素诱导的STAT3激活,食物摄入抑制和体重和脂肪质量的长期变化之间的关系.
主要方法:
- 雄性斯普拉格-道利大鼠每天接受腹膜内素输注 (0,5,10,20或40微克/天) 持续9天.
- 血清瘦素水平,食物摄入量,体重和背脂肪质量都被监测.
- 酸化STAT3 (pSTAT3) 水平在不同时间点在特定的大脑区域量化,包括腹中下丘脑 (VMH) 和孤独通道 (NTS) 核.
主要成果:
- 以最高剂量 (40微克/天) 输入慢性瘦素,血清瘦素增加了50-100%,暂时抑制了食物摄入,减轻了体重增加和脂肪量.
- 莱普没有改变能量消耗,呼吸交换率或棕色脂肪温度.
- VMH pSTAT3激活仅在食物摄入抑制期间 (4日) 观察到,而NTS pSTAT3激活在整个输液期间 (4日和9日) 持续存在.
结论:
- 激活VMH瘦素受体有助于急性抑制食物摄入.
- 持续激活NTS瘦素受体与长期减轻体重和脂肪量有关,这表明它在代谢平衡中发挥了作用.
- 这些发现表明,素利用不同的神经通路来立即抑制食欲和持续的代谢适应.
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