Endobrevin/VAMP-8–dependent dense granule release mediates thrombus formation in vivo

Author:

Graham Gwenda J.1,Ren Qiansheng2,Dilks James R.1,Blair Price1,Whiteheart Sidney W.2,Flaumenhaft Robert1

Affiliation:

1. Division of Hemostasis and Thrombosis, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA; and

2. Department of Molecular and Cellular Biochemistry, University of Kentucky College of Medicine, Lexington

Abstract

Individuals whose platelets lack dense or α-granules suffer various degrees of abnormal bleeding, implying that granule cargo contributes to hemostasis. Despite these clinical observations, little is known regarding the effects of impaired platelet granule secretion on thrombus formation in vivo. In platelets, SNARE proteins mediate the membrane fusion events required for granule cargo release. Endobrevin/VAMP-8 is the primary vesicle-SNARE (v-SNARE) responsible for efficient release of dense and α-granule contents; thus, VAMP-8−/− mice are a useful model to evaluate the importance of platelet granule secretion in thrombus formation. Thrombus formation, after laser-induced vascular injury, in these mice is delayed and decreased, but not absent. In contrast, thrombus formation is almost completely abolished in the mouse model of Hermansky-Pudlak syndrome, ruby-eye, which lacks dense granules. Evaluation of aggregation of VAMP-8−/− and ruby-eye platelets indicates that defective ADP release is the primary abnormality leading to impaired aggregation. These results demonstrate the importance of dense granule release even in the earliest phases of thrombus formation and validate the distal platelet secretory machinery as a potential target for antiplatelet therapies.

Publisher

American Society of Hematology

Subject

Cell Biology,Hematology,Immunology,Biochemistry

Reference57 articles.

1. [Unusual cases of hemorrhagic states from the group of so-called hypothromboplastinamias].;Hermansky;Cas Lek Cesk,1956

2. Albinism associated with hemorrhagic diathesis and unusual pigmented reticular cells in the bone marrow: report of two cases with histochemical studies.;Hermansky;Blood,1959

3. Albinism and abnormal platelet function.;Logan;N Engl J Med,1971

4. Mouse models of Hermansky Pudlak syndrome: a review.;Swank;Pigment Cell Res,1998

5. Gray platelet syndrome: a variety of qualitative platelet disorder.;Raccuglia;Am J Med,1971

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