R93W mutation in Orai1 causes impaired calcium influx in platelets.

Abstract:

:The intracellular Ca(2+) concentration of many nonexcitable cells is regulated by calcium store release and store-operated calcium entry (SOCE). In platelets, STIM1 was recently identified as the main calcium sensor expressed in the endoplasmic reticulum. To evaluate the role of the SOC channel moiety, Orai1, in platelet SOCE, we generated mice expressing a mutated, inactive form of Orai1 in blood cells only (Orai1(R93W)). Platelets expressing Orai1(R93W) were characterized by markedly reduced SOCE and impaired agonist-induced increases in [Ca(2+)](i). Orai1(R93W) platelets showed reduced integrin activation and impaired degranulation when stimulated with low agonist concentrations under static conditions. This defect, however, did not significantly affect the ability of Orai1(R93W) platelets to aggregate or to adhere to collagen under arterial flow conditions ex vivo. In contrast, these adherent Orai1(R93W) platelets were defective in surface phosphatidylserine exposure, suggesting that Orai1 is crucial for the platelets' procoagulant response rather than for other Ca(2+)-dependent cellular responses.

journal_name

Blood

journal_title

Blood

authors

Bergmeier W,Oh-Hora M,McCarl CA,Roden RC,Bray PF,Feske S

doi

10.1182/blood-2008-08-174516

subject

Has Abstract

pub_date

2009-01-15 00:00:00

pages

675-8

issue

3

eissn

0006-4971

issn

1528-0020

pii

blood-2008-08-174516

journal_volume

113

pub_type

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