Decreased Thromboembolic Stroke but not Atherosclerosis or Vascular Remodeling in Mice with ROCK2-deficient Platelets
Authors
Sladojevic, NikolaOh, Goo Taeg.
Kim, Hyung-Hwan
Beaulieu, Lea M.
Falet, Herve
Kaminski, Karol
Freedman, Jane E.
Liao, James K.
UMass Chan Affiliations
UMass Metabolic NetworkDepartment of Medicine, Division of Cardiovascular Medicine
Document Type
Journal ArticlePublication Date
2017-04-14Keywords
BiochemistryCardiology
Cardiovascular Diseases
Cell Biology
Cellular and Molecular Physiology
Molecular Biology
Metadata
Show full item recordAbstract
Aims: Rho-associated coiled-coil containing kinase (ROCK)-2 is an important mediator of the actin cytoskeleton. Because changes in the actin cytoskeleton are critical for platelet function, we hypothesized that ROCK2 in platelets will play important role in thrombosis and can be potentially a target for therapeutic intervention in thromboembolic stroke. Methods and Results: We generated platelet-specific ROCK2-deficient mice (ROCK2 Plt-/- ) from conditional ROCK2 fl degrees x/fl degrees x and platelet factor (PF)-4-Cre transgenic mice. Platelets from ROCK2 Plt-/- mice were less responsive to thrombin stimulation in terms of pseudopodia formation, collagen adhesion, and in the formation of homotypic and heterotypic aggregates. This corresponded to prolonged bleeding time and delayed vascular occlusion following vessel injury. To determine whether these changes in platelet function could affect thrombotic disease, we utilized a clot-embolic model of ischemic stroke. When pre-formed clots from ROCK2 Plt-/- mice were injected into the middle cerebral artery of control mice, cerebral blood flow recovery occurred more rapidly, leading to decreased cerebral injury and neurological deficits, compared to pre-formed clots from control mice. Interestingly, pre-formed clots from control mice produced similar degree of cerebral injury when injected into control or ROCK2 Plt-/- mice, suggesting that platelet ROCK2 deficiency affects clot formation but not propagation. Indeed, in a non-thrombotic intra-filament MCA occlusion model of stroke, platelet ROCK2 deletion was not protective. Furthermore, ROCK2 Plt-/- mice exhibit similar atherosclerosis severity and vascular remodeling as control mice. Conclusion: These findings indicate that platelet ROCK2 plays important role in platelet function and thrombosis, but does not contribute to the pathogenesis of atherosclerosis and vascular remodeling.Source
Cardiovasc Res. 2017 Apr 14. doi: 10.1093/cvr/cvx071. Link to article on publisher's siteDOI
10.1093/cvr/cvx071Permanent Link to this Item
http://hdl.handle.net/20.500.14038/36703PubMed ID
28430966Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1093/cvr/cvx071