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.
复制标题
DOI:
10.1016/j.neuropharm.2010.12.024
复制
发表时间:
2011-05
影响因子:
4.7
通讯作者:
Isokawa, Masako
中科院分区:
文献类型:
--
作者:
Cuellar, Jacquelynn N.;Isokawa, Masako
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.
登录
查看更多内容
影响因子:
16.2
作者:
Cowley, MA;Smith, RG;Horvath, TL
通讯作者:
Horvath, TL
影响因子:
--
作者:
Holst, B;Cygankiewicz, A;Schwartz, TW
通讯作者:
Schwartz, TW
影响因子:
2.9
作者:
Nicholson, RA;Liao, C;Lees, G
通讯作者:
Lees, G
DOI:
10.1016/s0169-328x(02)00183-3
发表时间:
2002-06-15
期刊:
MOLECULAR BRAIN RESEARCH
影响因子:
--
作者:
Thompson, CL;Drewery, DL;Chazot, PL
通讯作者:
Chazot, PL
影响因子:
2.9
作者:
Harrold, Joanne A.;Dovey, Terence;Pinkney, Jonathon
通讯作者:
Pinkney, Jonathon