کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2562780 | 1127281 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: P2Y13 receptor is responsible for ADP-mediated degranulation in RBL-2H3 rat mast cells P2Y13 receptor is responsible for ADP-mediated degranulation in RBL-2H3 rat mast cells](/preview/png/2562780.png)
Extracellular ADP is known to play many important physiological roles. In this study, we identified the P2Y13 receptor in a rat mast cell line (RBL-2H3) and explored the functional role of ADP, its endogenous agonist. ADP induced both intracellular calcium mobilization and release of hexosaminidase (Hex). In an assay of intracellular calcium, ADP was 100-fold less potent than and equally efficacious as the P2Y1 receptor-selective agonist MRS2365. However, ADP was more potent and efficacious than MRS2365 in inducing Hex release and in enhancing antigen-induced Hex release. ADP-induced intracellular calcium mobilization was blocked by phospholipase C inhibitor U73122 and by P2Y1 receptor-selective antagonist MRS2500, but not by pertussis toxin (PTX), suggesting a mechanism mediated by the Gq-coupled P2Y1 receptor, but not P2Y13 (Gi-coupled) or P2X receptors. ADP-induced Hex release was blocked by PTX and a selective P2Y13 receptor antagonist MRS2211, but not by MRS2500 or P2Y1 receptor-specific siRNA, suggesting a Gi-coupled P2Y13 receptor-related mechanism. Measurement of gene expression confirmed high expression of both P2Y1 and P2Y13 receptors (in comparison to a previously reported P2Y14 receptor) in RBL-2H3 cells. Thus, we demonstrated that ADP-mediated intracellular calcium mobilization and Hex release in RBL-2H3 cells are via P2Y1 and P2Y13 receptors, respectively. Selective antagonists of the P2Y13 receptor might be novel therapeutic agents for various allergic conditions.
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Journal: Pharmacological Research - Volume 62, Issue 6, December 2010, Pages 500–505