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Interaction of the human prostacyclin receptor with the PDZ adapter protein PDZK : role in endothelial cell migration and angiogenesis
Turner, Elizebeth C.; Mulvaney, Eamon P.; Reid, Helen M.; Kinsella, B. Therese
Prostacyclin is increasingly implicated in re-endothelialization and angiogenesis but through largely unknown mechanisms. Herein, the HDL scavenger receptor class B, type 1 (SR-B1) adapter protein PDZ domain-containing protein 1 (PDZK1) was identified as an interactant of the human prostacyclin receptor (hIP) involving a Class I PDZ ligand at its carboxyl-terminus and PDZ domains 1, 3 and 4 of PDZK1. While the interaction is constitutive, it may be dynamically regulated following cicaprost-activation of the hIP through a mechanism involving cAMP-dependent protein kinase (PK)A-phosphorylation of PDZK1 at Ser505. While PDZK1 did not increase overall levels of the hIP, it increased its functional expression at the cell surface enhancing ligand binding and cicaprost-induced cAMP generation. Consistent with its role in re-endothelialization and angiogenesis, cicaprost-activation of the hIP increased endothelial cell migration and tube formation/in vitro angiogenesis, effects completely abrogated by the specific IP antagonist RO1138452. Furthermore, similar to HDL/SR-B1, siRNA-targeted disruption of PDZK1 abolished cicaprost-mediated endothelial responses but did not affect VEGF-responses. Considering the essential role played by prostacyclin throughout the cardiovascular system, identification of PDZK1 as a functional interactant of the hIP sheds significant mechanistic insights into the protective roles of these key players, and potentially HDL/SR-B1, within the vascular endothelium. Science Foundation Ireland ti,ab,ot -SB01/09/2011
Keyword(s): Prostacyclin receptor; PDZK1; Prostacyclin; Protein-protein interactions; Neovascularization; Receptors, Epoprostenol; PDZK1 protein, human; Endothelial Cells; Neovascularization, Physiologic
Publication Date:
Type: Journal article
Peer-Reviewed: Unknown
Language(s): English
Institution: University College Dublin
Publisher(s): American Society for Cell Biology
Alternative Title(s): Interaction of PDZK1 with the human prostacyclin receptor
File Format(s): other; application/pdf
First Indexed: 2012-08-25 05:17:32 Last Updated: 2018-10-11 16:26:50