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Decreased thromboembolic stroke but not atherosclerosis or vascular remodelling in mice with ROCK2-deficient platelets

Title
Decreased thromboembolic stroke but not atherosclerosis or vascular remodelling in mice with ROCK2-deficient platelets
Authors
Sladojevic N.Oh G.T.Kim H.-H.Beaulieu L.M.Falet H.Kaminski K.Freedman J.E.Liao J.K.
Ewha Authors
오구택
SCOPUS Author ID
오구택scopus
Issue Date
2017
Journal Title
Cardiovascular research
ISSN
1755-3245JCR Link
Citation
Cardiovascular research vol. 113, no. 11, pp. 1307 - 1317
Keywords
AtherosclerosisPlateletRho kinaseStrokeThrombosis
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
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.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 (ROCK2Plt-/-) from conditional ROCK2fl°x/fl°x and platelet factor (PF)-4-Cre transgenic mice. Platelets from ROCK2Plt-/- 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 ischaemic stroke. When pre-formed clots from ROCK2Plt-/- 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 ROCK2Plt-/- 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, ROCK2Plt-/- mice exhibit similar atherosclerosis severity and vascular remodeling as control mice. Published on behalf of the European Society of Cardiology. All rights reserved. © The Author 2017. For permissions please email: journals.permissions@oup.com.
DOI
10.1093/cvr/cvx071
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자연과학대학 > 생명과학전공 > Journal papers
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