被盖腹侧区
多巴胺能
多巴胺
有条件地点偏好
类阿片
神经科学
多巴胺能途径
中边缘通路
合成代谢
内源性阿片
阿片受体
化学
神经传递
上瘾
强啡肽
内科学
阿片肽
受体
医学
心理学
作者
Leonardo Bontempi,Antonello Bonci
出处
期刊:Science Signaling
[American Association for the Advancement of Science (AAAS)]
日期:2020-09-01
卷期号:13 (647)
被引量:4
标识
DOI:10.1126/scisignal.aba1169
摘要
Anabolic androgenic steroids (AAS) have medical utility but are often abused, and the effects of AAS on reward circuits in the brain have been suggested to lead to addiction. We investigated the previously reported correlations between AAS and the endogenous μ-opioid system in the rewarding properties of AAS in mice. We found that a single injection of a supraphysiological dose of natural or synthetic AAS strengthened excitatory synaptic transmission in putative ventral tegmental area (VTA) dopaminergic neurons. This effect was associated with the activation of μ-opioid receptors (MORs) and an increase in β-endorphins released into the VTA and the plasma. Irreversible blockade of MORs in the VTA counteracted two drug-seeking behaviors, locomotor activity and place preference. These data suggest that AAS indirectly stimulate a dopaminergic reward center of the brain through activation of endogenous opioid signaling and that this mechanism mediates the addictive effects of AAS.
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