2-Arachidonoylglycerol mobilization following brief synaptic stimulation in the dorsal lateral striatum requires glutamatergic and cholinergic neurotransmission.

2-Arachidonoylglycerol mobilization following brief synaptic stimulation in the dorsal lateral striatum requires glutamatergic and cholinergic neurotransmission.
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DOI:
10.1016/j.neuropharm.2021.108916
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发表时间:
2022-03-01
期刊:
影响因子:
4.7
通讯作者:
Lovinger DM
Lovinger DM
中科院分区:
医学2区
文献类型:
--
作者:
Liput DJ;Puhl HL;Dong A;He K;Li Y;Lovinger DM

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背外侧纹状体 (DLS) 中已经描述了几种形式的内源性大麻素 (eCB) 信号传导,但是大多数用于生成 eCB 的实验方案并没有重现皮层中纹状体投射锥体神经元的放电模式或纹状体中型多棘神经元的放电模式。因此,目前尚不清楚 DLS 中的 eCB 信号传导模型是否能够可靠地描述生理条件下的机制。为了解决这种不确定性,我们研究了短暂的突触刺激后 eCB 动员的机制,模拟 DLS 中神经活动的体内模式。为了监测 eCB 动员,新型基因编码荧光 eCB 生物传感器 GRABeCB2.0 在 C57BL6J 小鼠的皮质纹状体传入神经突触前表达,并使用脑切片光度测定技术在 DLS 中测量诱发的 eCB 瞬变。我们发现短暂的突触刺激会引起持久的 eCB 瞬变,这种瞬变主要是由 2-花生四烯酰甘油 (2-AG) 动员产生的。有效的 2-AG 动员需要同时激活 AMPA 和 NMDA 离子型谷氨酸受体以及毒蕈碱 M1 受体。胆碱能中间神经元上表达的多巴胺 D2 受体通过抑制乙酰胆碱释放来抑制 2-AG 动员。总的来说,这些数据揭示了 DLS 中 2-AG 动员的未被认识的机制。
Several forms of endocannabinoid (eCB) signaling have been described in the dorsal lateral striatum (DLS), however most experimental protocols used to generate eCBs do not recapitulate the firing patterns of striatal-projecting pyramidal neurons in the cortex or firing patterns of striatal medium spiny neurons. Therefore, it is unclear if current models of eCB signaling in the DLS provide a reliable description of mechanisms engaged under physiological conditions. To address this uncertainty, we investigated mechanisms of eCB mobilization following brief synaptic stimulation that mimics in vivo patterns of neural activity in the DLS. To monitor eCB mobilization, the novel genetically encoded fluorescent eCB biosensor, GRABeCB2.0, was expressed presynaptically in corticostriatal afferents of C57BL6J mice and evoked eCB transients were measured in the DLS using a brain slice photometry technique. We found that brief bouts of synaptic stimulation induce long lasting eCB transients that were generated predominantly by 2-arachidonoylglycerol (2-AG) mobilization. Efficient 2-AG mobilization required coactivation of AMPA and NMDA ionotropic glutamate receptors and muscarinic M1 receptors. Dopamine D2 receptors expressed on cholinergic interneurons inhibited 2-AG mobilization by inhibiting acetylcholine release. Collectively, these data uncover unrecognized mechanisms underlying 2-AG mobilization in the DLS.
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