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Circ Res. 2017 Jun 23;121(1):31-42. doi: 10.1161/CIRCRESAHA.117.310694. Epub 2017 Apr 20.

Flow Perturbation Mediates Neutrophil Recruitment and Potentiates Endothelial Injury via TLR2 in Mice: Implications for Superficial Erosion.

Author information

1
From the Department of Cardiovascular Medicine (G.F., T.M., G.S., M.S., A.C., M.B.-M., Y.C., T.Q., Y.T., E.S., G.K.S., E.A., K.J.C., P.L.), and Center for Interdisciplinary Cardiovascular Sciences (E.A.), Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston (G.S.M., F.K.S., M.N.); and Department of Engineering and Technology, College of Engineering and Computing, Nova Southeastern University, Fort Lauderdale, FL (M.S.).
2
From the Department of Cardiovascular Medicine (G.F., T.M., G.S., M.S., A.C., M.B.-M., Y.C., T.Q., Y.T., E.S., G.K.S., E.A., K.J.C., P.L.), and Center for Interdisciplinary Cardiovascular Sciences (E.A.), Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston (G.S.M., F.K.S., M.N.); and Department of Engineering and Technology, College of Engineering and Computing, Nova Southeastern University, Fort Lauderdale, FL (M.S.). plibby@bwh.harvard.edu.

Abstract

RATIONALE:

Superficial erosion currently causes up to a third of acute coronary syndromes; yet, we lack understanding of its mechanisms. Thrombi because of superficial intimal erosion characteristically complicate matrix-rich atheromata in regions of flow perturbation.

OBJECTIVE:

This study tested in vivo the involvement of disturbed flow and of neutrophils, hyaluronan, and Toll-like receptor 2 ligation in superficial intimal injury, a process implicated in superficial erosion.

METHODS AND RESULTS:

In mouse carotid arteries with established intimal lesions tailored to resemble the substrate of human eroded plaques, acute flow perturbation promoted downstream endothelial cell activation, neutrophil accumulation, endothelial cell death and desquamation, and mural thrombosis. Neutrophil loss-of-function limited these findings. Toll-like receptor 2 agonism activated luminal endothelial cells, and deficiency of this innate immune receptor decreased intimal neutrophil adherence in regions of local flow disturbance, reducing endothelial cell injury and local thrombosis (P<0.05).

CONCLUSIONS:

These results implicate flow disturbance, neutrophils, and Toll-like receptor 2 signaling as mechanisms that contribute to superficial erosion, a cause of acute coronary syndrome of likely growing importance in the statin era.

KEYWORDS:

acute coronary syndromes; disturbed flow; endothelium; neutrophils; superficial erosion

PMID:
28428204
PMCID:
PMC5488735
DOI:
10.1161/CIRCRESAHA.117.310694
[Indexed for MEDLINE]
Free PMC Article

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