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首页> 外文期刊>Journal of Neurophysiology >Low-frequency stimulation evokes serotonin release in the nucleus accumbens and induces long-term depression via production of endocannabinoid
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Low-frequency stimulation evokes serotonin release in the nucleus accumbens and induces long-term depression via production of endocannabinoid

机译:低频刺激会引起伏隔核中5-羟色胺的释放,并通过产生内源性大麻素引起长期抑郁

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摘要

The nucleus accumbens (NAc), a major component of the mesolimbic system, is involved in the mediation of reinforcing and addictive properties of many dependence-producing drugs. Glutamatergic synapses within the NAc can express plasticity, including a form of endocannabinoid (eCB)-long-term depression (LTD). Recent evidences demonstrate cross talk between eCB signaling pathways and those of other receptor systems, including serotonin (5-HT); the extensive colocalization of CB1 and 5-HT receptors within the NAc suggests the potential for interplay between them. In the present study, we found that 20-min low-frequency (4 Hz) stimulation (LFS-4Hz) of glutamatergic afferences in rat brain slices induces a novel form of eCB-LTD in the NAc core, which requires 5-HT2 and CB1 receptor activation and L-type voltage-gated Ca2+ channel opening. Moreover, we found that exogenous 5-HT application (5 muM, 20 min) induces an analogous LTD (5-HT-LTD) at the same synapses, requiring the activation of the same receptors and the opening of the same Ca2+ channels; LFS-4Hz-LTD and 5-HT-LTD were mutually occlusive.
机译:伏伏核(NAc)是中脑边缘系统的主要组成部分,它参与了许多产生依赖性药物的增强和成瘾性的介导。 NAc中的谷氨酸能突触可以表达可塑性,包括一种形式的内源性大麻素(eCB)-长期抑郁症(LTD)。最近的证据表明,eCB信号通路与其他受体系统(包括5-羟色胺(5-HT))的通路之间存在串扰。 NAc中CB1和5-HT受体的广泛共定位表明它们之间可能相互作用。在本研究中,我们发现大鼠脑切片中的谷氨酸能障碍的20分钟低频(4 Hz)刺激(LFS-4Hz)诱导了NAc核心中新型eCB-LTD的形成,其需要5-HT2和CB1受体激活和L型电压门控Ca2 +通道开放。此外,我们发现外源5-HT应用(5μM,20分钟)会在相同的突触处诱导类似的LTD(5-HT-LTD),需要激活相同的受体并打开相同的Ca2 +通道。 LFS-4Hz-LTD和5-HT-LTD是相互封闭的。

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