Endothelial cell protein C receptor cellular localization and trafficking: potential functional implications.

Abstract:

:Although the binding of endothelial cell protein C receptor (EPCR) to its ligands is well characterized at the biochemical level, it remains unclear how EPCR interaction with its ligands at the cell surface impacts its cellular trafficking. We characterized the cellular localization and trafficking of EPCR in endothelial cells and a heterologous expression system. Immunofluorescence confocal microscopy studies revealed that a majority of EPCR is localized on the cell surface in membrane microdomains that are positive for caveolin-1. A small fraction of EPCR is also localized intracellularly in the recycling compartment. Factor VIIa (FVIIa) or activated protein C binding to EPCR promoted the internalization of EPCR. EPCR and EPCR-bound ligands were endocytosed rapidly via a dynamin- and caveolar-dependent pathway. The endocytosed receptor-ligand complexes were accumulated in a recycling compartment before being targeted back to the cell surface. EPCR-mediated FVIIa endocytosis/recycling also resulted in transport of FVIIa from the apical to the basal side. In vivo studies in mice showed that blockade of EPCR with EPCR-blocking antibodies impaired the early phase of FVIIa clearance. Overall, our results show that FVIIa or activated protein C binding to EPCR promotes EPCR endocytosis, and EPCR-mediated endocytosis may facilitate the transcytosis of FVIIa and its clearance from the circulation.

journal_name

Blood

journal_title

Blood

authors

Nayak RC,Sen P,Ghosh S,Gopalakrishnan R,Esmon CT,Pendurthi UR,Rao LV

doi

10.1182/blood-2009-03-208900

subject

Has Abstract

pub_date

2009-08-27 00:00:00

pages

1974-86

issue

9

eissn

0006-4971

issn

1528-0020

pii

blood-2009-03-208900

journal_volume

114

pub_type

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