ROCK1 mediates leukocyte recruitment and neointima formation following vascular injury.

The Journal of Clinical Investigation
Kensuke NomaJames K Liao

Abstract

Although Rho-associated kinase (ROCK) activity has been implicated in cardiovascular diseases, the tissue- and isoform-specific roles of ROCKs in the vascular response to injury are not known. To address the role of ROCKs in this process, we generated haploinsufficient Rock1 (Rock1(+/-)) and Rock2 (Rock2(+/-)) mice and performed carotid artery ligations. Following this intervention, we found reduced neointima formation in Rock1(+/-) mice compared with that of WT or Rock2(+/-) mice. This correlated with decreased vascular smooth muscle cell proliferation and survival, decreased levels proinflammatory adhesion molecule expression, and reduced leukocyte infiltration. In addition, thioglycollate-induced peritoneal leukocyte recruitment and accumulation were substantially reduced in Rock1(+/-) mice compared with those of WT and Rock2(+/-) mice. To determine the role of leukocyte-derived ROCK1 in neointima formation, we performed reciprocal bone marrow transplantation (BMT) in WT and Rock1(+/-) mice. Rock1(+/-) to WT BMT led to reduced neointima formation and leukocyte infiltration following carotid ligation compared with those of WT to WT BMT. In contrast, WT to Rock1(+/-) BMT resulted in increased neointima formation. These finding...Continue Reading

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Methods Mentioned

BETA
GTPases
PCR
lavage
light microscopy

Software Mentioned

NIH
ImageJ
Biosystems
Applied

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