The platelet release reaction: just when you thought platelet secretion was simple.

Abstract:

PURPOSE OF REVIEW:In response to agonists produced at vascular lesions, platelets release a host of components from their three granules: dense core, alpha, and lysosome. This releasate activates other platelets, promotes wound repair, and initiates inflammatory responses. Although widely accepted, the specific mechanisms underlying platelet secretion are only now coming to light. This review focuses on the core machinery required for platelet secretion. RECENT FINDINGS:Proteomic analyses have provided a catalog of the components released from activated platelets. Experiments using a combination of in-vitro secretion assays and knockout mice have led to assignments of both vesicle-soluble N-ethylmaleimide-sensitive fusion protein attachment protein receptor (v-SNARE) and target membrane SNARE to each of the three secretion events. SNARE knockout mice are also proving to be useful models for probing the role of platelet exocytosis in vivo. Other studies are beginning to identify SNARE regulators, which control when and where SNAREs interact during platelet activation. SUMMARY:A complex set of protein-protein interactions control the membrane fusion events required for the platelet release reaction. SNARE proteins are the core elements but the proteins that control SNARE interactions represent key points at which platelet signaling cascades could affect secretion and thrombosis.

journal_name

Curr Opin Hematol

authors

Ren Q,Ye S,Whiteheart SW

doi

10.1097/MOH.0b013e328309ec74

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

537-41

issue

5

eissn

1065-6251

issn

1531-7048

pii

00062752-200809000-00016

journal_volume

15

pub_type

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