Ghrelin-induced activation of cAMP signal transduction and its negative regulation by endocannabinoids in the hippocampus.

Ghrelin-induced activation of cAMP signal transduction and its negative regulation by endocannabinoids in the hippocampus.
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DOI:
10.1016/j.neuropharm.2010.12.024
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发表时间:
2011-05
期刊:
影响因子:
4.7
通讯作者:
Isokawa, Masako
Isokawa, Masako
中科院分区:
医学2区
文献类型:
--
作者:
Cuellar, Jacquelynn N.;Isokawa, Masako

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越来越多的证据表明,肠肽生长素释放肽有助于学习行为和记忆任务。本研究证明了海马中生长素释放肽的细胞信号传导机制。 Ghrelin 通过激活 cAMP、蛋白激酶 A (PKA) 以及 NMDA 受体 NR1 亚基的 PKA 依赖性磷酸化来刺激 CREB(cAMP 反应元件结合蛋白)。 Ghrelin 增加了鬼笔环肽与 F-肌动蛋白的结合,表明 CREB ​​诱导的基因表达可能包括细胞骨架蛋白的重组。尽管生长素释放肽受体主要与 Gq 蛋白偶联,但该效应仍被生长素释放肽受体拮抗剂阻断。我们还发现内源性大麻素对 ghrelin 诱导的 NR1 磷酸化和 CREB ​​活性有抑制作用。 2-花生四烯酰甘油(2-AG)以1型大麻素受体(CB1R)依赖性方式发挥其抑制作用,而anandamide的抑制作用在CB1R和香草酸受体拮抗剂存在的情况下持续存在,表明anandamide可能直接抑制NMDA受体/通道。我们的研究结果可以解释生长素释放肽和内源性大麻素如何调节海马食欲学习和可塑性。
Increasing evidence indicates that the gut peptide ghrelin facilitates learning behavior and memory tasks. The present study demonstrates a cellular signaling mechanism of ghrelin in the hippocampus. Ghrelin stimulated CREB (cAMP response-element binding protein) through the activation of cAMP, protein kinase A (PKA), and PKA-dependent phosphorylation of NR1 subunit of the NMDA receptor. Ghrelin increased phalloidin-binding to F-actin suggesting CREB-induced gene expression might include reorganization of cytoskeletal proteins. The effect was blocked by the antagonist of the ghrelin receptor in spite of the receptor’s primary coupling to Gq proteins. We also discovered inhibitory effect of endocannabinoids on ghrelin-induced NR1 phosphorylation and CREB activity. 2-arachidonoylglycerol (2-AG) exerted its inhibitory effect in the Type1 cannabinoid receptor (CB1R)-dependent manner, while anandamide’s inhibitory effect persisted in the presence of antagonists of CB1R and the vanilloid receptor, suggesting that anandamide might directly inhibit NMDA receptor/channels. Our findings may explain how ghrelin and endocannabinoids regulate hippocampal appetitive learning and plasticity.
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