Howl J, Mondszein RM, Wheatley M. Characterization of G protein-coupled receptors expressed by ECV304 human endothelial cells.
ENDOTHELIUM : JOURNAL OF ENDOTHELIAL CELL RESEARCH 1998;
6:23-32. [PMID:
9832330 DOI:
10.3109/10623329809053402]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aims of this study were to characterize G protein-coupled receptors endogenously expressed by ECV304 human endothelial cells, and to determine the utility of this transformed cell line as a vehicle for the expression of cloned receptors. Cellular responses to a broad range of agonists were determined by measuring changes in the intracellular content of second messengers (inositol phosphates and cyclic adenosine monophosphate). These studies identified H1 histamine receptors, P2U-purinoceptors and lysophosphatidic acid receptors which are functionally coupled to phosphoinositidase C. G protein-coupled receptors which bind adenosine (A2 receptor), calcitonin, and adrenaline (beta-adrenoceptor), and markedly stimulate adenylyl cyclase, are also endogenously expressed by ECV304. Agonists which did not stimulate ECV304 cells are: angiotensin II, angiotensin1-7, bombesin, bradykinin, desArg9-bradykinin, carbachol, endothelin-1, neurotensin, serotonin, substance K, substance P, thrombin and vasopressin. The rat Via vasopressin receptor was expressed by lipofection in two antibiotic-resistant clonal lines and expression confirmed by measuring agonist-induced changes in inostol phosphate production. We conclude that the ECV304 cell line is a suitable in vitro system to study the signal transduction pathways of some endogenous G protein-coupled receptors known to modulate endothelial function in vivo. ECV304 is also appropriate for the expression and functional characterization of cloned receptor proteins.
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