The C-terminal Helix 9 motif regulates cannabinoid receptor type 1 trafficking and surface expression

The C-terminal Helix 9 motif regulates cannabinoid receptor type 1 trafficking and surface expression
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C 端 Helix 9 基序调节大麻素受体 1 型运输和表面表达

DOI:
10.1101/501528
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Fletcher-Jones A
Fletcher-Jones A
中科院分区:
--
文献类型:
--
作者:
Fletcher-Jones A

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大麻素1型受体(CB1R)只在轴突表面稳定表达,下调神经递质的释放。这种严格调控的轴突表面极性是如何建立和维持的,目前尚不清楚。为了解决这个问题,我们使用时间分辨成像来确定CB1R从生物合成到成熟的极化定位的运输。我们发现CB1R的分泌途径是轴向偏向的,表面表达的CB1R在轴突中比在树突中更稳定。这种双重机制是由CB1R C-末端介导的,涉及螺旋9(H9)结构域。H9结构域的去除增加了树突分泌途径的传递,降低了表面稳定性。此外,CB1RΔH9对激动剂诱导的内化更敏感,在下游信号转导方面的效率低于CB1RWT。综上所述,这些结果为CB1R的极性是如何介导的提供了新的线索,并表明C-末端H9结构域在这一过程中发挥了关键作用。
Cannabinoid type 1 receptor (CB1R) is only stably surface expressed in axons, where it downregulates neurotransmitter release. How this tightly regulated axonal surface polarity is established and maintained is unclear. To address this question, we used time-resolved imaging to determine the trafficking of CB1R from biosynthesis to mature polarised localisation. We show that the secretory pathway delivery of CB1R is axonally biased and that surface expressed CB1R is more stable in axons than in dendrites. This dual mechanism is mediated by the CB1R C-terminal and involves the Helix 9 (H9) domain. Removal of theH9domain increases dendrite secretory pathway delivery and decreases in surface stability. Furthermore, CB1RΔH9is more sensitive to agonist-induced internalisation and less efficient at downstream signalling than CB1RWT. Together, these results shed new light on how polarity of CB1R is mediated and indicate that the C-terminalH9domain plays key roles in this process.
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