厌恶诱导的吸毒和逃跑行为涉及类似的核 accumbens 核心多巴胺信号签名
Elaine M Grafelman1, Bridgitte E Côté1,2, Lisa Vlach1
1Department of Biomedical Sciences, Marquette University, Milwaukee, WI 53233, USA.
bioRxiv : the preprint server for biology
|August 16, 2024
概括
厌恶性刺激会降低核聚合核 (NAcC) 中的多巴胺,增加诸如寻找药物和逃跑等有动机的行为. 这种多巴胺信号变化是不同环境中对厌恶的常见生理反应.
科学领域:
- 神经科学是一个神经科学.
- 行为神经科学 行为神经科学
- 成研究 研究成研究
背景情况:
- 核心核 (NAcC) 中多巴胺释放与有动机的行为有关.
- 抑制多巴胺信号传递可以矛盾地增加某些行为,包括药物自我管理.
- 厌恶性刺激通常会降低多巴胺,但它们在不同环境中的一致作用尚未完全理解.
研究的目的:
- 在不同的实验设计中调查厌恶刺激编码和行为促进的统一性.
- 为了确定厌恶刺激是否会在NAcC中连续激活多巴胺信号机制.
- 为了比较生理和行为反应相同的厌恶刺激在不同的背景下.
主要方法:
- 纤维光度法用于测量雄性和雌性大鼠的NAcC多巴胺水平.
- 老鼠接受了可卡因的自我管理,间歇地呈现出厌恶的白噪声.
- 在一个操作式逃生设计中,研究了一组单独的老鼠,以终止厌恶的白噪声.
主要成果:
- 厌恶性白噪声在自给和逃生设计中显著降低了NAcC多巴胺水平.
- 可卡因自我管理和逃跑尝试与多巴胺减少同时增加.
- 在两种实验设置中,多巴胺减少的程度与行为表现相关.
结论:
- 厌恶的环境刺激自然会在NAcC中激发多巴胺信号,导致多巴胺减少.
- 这种多巴胺降低机制是可概括的,在与药物相关的和非药物相关的环境中观察到的.
- 厌恶的常见生理特征促进了适应性 (逃避) 和潜在的不适应性 (寻找药物) 行为.
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