Integrin clustering enables anandamide-induced Ca2+ signaling in endothelial cells via GPR55 by protection against CB1-receptor-triggered repression

被引:134
作者
Waldeck-Weiermair, Markus [1 ]
Zoratti, Cristina [1 ]
Osibow, Karin [1 ]
Balenga, Nariman [2 ]
Goessnitzer, Edith [3 ]
Waldhoer, Maria [2 ]
Malli, Roland [1 ]
Graier, Wolfgang F. [1 ]
机构
[1] Med Univ Graz, Inst Mol Biol & Biochem, A-8010 Graz, Austria
[2] Med Univ Graz, Inst Expt & Clin Pharmacol, A-8010 Graz, Austria
[3] Graz Univ, Inst Pharmaceut Chem, Graz, Austria
基金
奥地利科学基金会;
关键词
anandamide; Bmx/Etk; cannabinoid signaling; CB1; receptor; GPR55; Ca2+ signaling; integrins; Syk;
D O I
10.1242/jcs.020958
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Although the endocannabinoid anandamide is frequently described to act predominantly in the cardiovascular system, the molecular mechanisms of its signaling remained unclear. In human endothelial cells, two receptors for anandamide were found, which were characterized as cannabinoid 1 receptor (CB1R; CNR1) and G-protein-coupled receptor 55 (GPR55). Both receptors trigger distinct signaling pathways. It crucially depends on the activation status of integrins which signaling cascade becomes promoted upon anandamide stimulation. Under conditions of inactive integrins, anandamide initiates CB1R-derived signaling, including G(i)-protein-mediated activation of spleen tyrosine kinase (Syk), resulting in NF kappa B translocation. Furthermore, Syk inhibits phosphoinositide 3-kinase (PI3K) that represents a key protein in the transduction of GPR55-originated signaling. However, once integrins are clustered, CB1R splits from integrins and, thus, Syk cannot further inhibit GPR55-triggered signaling resulting in intracellular Ca2+ mobilization from the endoplasmic reticulum (ER) via a PI3K-Bmx-phospholipase C (PLC) pathway and activation of nuclear factor of activated T-cells. Altogether, these data demonstrate that the physiological effects of anandamide on endothelial cells depend on the status of integrin clustering.
引用
收藏
页码:1704 / 1717
页数:14
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