AgRP神经元通过活动依赖的催产素连接性和自主调节的发展进行介导
Jessica E Biddinger1, Amanda E T Elson2, Payam A Fathi1
1Department of Molecular Physiology & Biophysics, Vanderbilt University, Nashville, TN 37232.
概括
在生命早期,瘦素信号传递对于开发调节食欲和自主功能的神经通路至关重要. 操纵agouti相关 (AgRP) 神经元活动塑造了这些关键的下丘脑连接.
科学领域:
- 神经科学是一个神经科学.
- 内分泌学 在内分泌学.
- 发展生物学 发展生物学
背景情况:
- 瘦素对于产后发育至关重要,它会影响下丘脑中的神经元路径.
- 莱普介导的神经活动在确定下丘脑神经投影中的作用仍然在很大程度上是未知的.
- 弧形核中的阿古蒂相关 (AgRP) 神经元是叶黄素信号的关键目标.
研究的目的:
- 为了研究如何在关键的产后期内以莱普丁为媒介的AgRP神经元活动影响下丘脑神经回路的发展.
- 检查对AgRP投射到对腹腔核 (PVH) 和下游连接到背部阴道复合体 (DVC) 的影响.
主要方法:
- 在定义的早期产后窗口期间,利用化学遗传学操纵小鼠的AgRP神经元活动.
- 评估了AgRP神经元输入到PVH和催产素输出到DVC的发展.
- 评估与内化缺陷相关的自主功能.
主要成果:
- 莱普缺乏症损害了AgRP神经元对PVH催产素神经元的向,以及催产素与DVC的连接.
- 产后激活AgRP神经元在白缺乏小鼠中挽救了这些缺陷.
- 在野生型小鼠中抑制AgRP神经元活动减少了AgRP输入到PVH和催产素纤维到DVC,导致自主功能障碍.
结论:
- 素依赖的AgRP神经元活动对于PVH连接的发育规范至关重要.
- 这种机制突出了神经电路发育的新型活动依赖途径,涉及自主反应的下丘脑控制.
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