Role of CC-chemokine Receptor 5 on Myocardial Ischemia-reperfusion Injury in Rats

Overview

Journal Mol Cell Biochem

Publisher Springer

Specialty Biochemistry

Date 2013 Mar 5

PMID 23456481

Citations 7

Authors

Bo Shen

Jun Li

Ling Gao

Jieyu Zhang

Bo Yang

Affiliations

Soon will be listed here.

Abstract

The expression level of CC-chemokine receptor 5 (CCR5) is enhanced post inflammatory stimulations and might play a crucial role on inflammatory cells infiltration post myocardial ischemia. The purpose of this study was to evaluate the role of CCR5 on myocardial ischemia-reperfusion (I/R) injury in rats. Adult male rats were randomized to sham group, I/R group (I/R, 30 min coronary artery occlusion followed by 2-h reperfusion), ischemic preconditioning (I/R + Pre), CCR5 antibody group [I/R + CCR5Ab (0.2 mg/kg)], and CCR5 agonist group [I/R + CCR5Ago, RNATES (0.1 mg/kg)], n = 12 each group. The serum level of creatine kinase (CK) and tumor necrosis factor α (TNF-α) were measured by ELISA. Myocardial infarction size and myeloperoxidase (MPO) activity were determined. Myocardial protein expression of CCR5 and intercellular adhesion molecule-1 (ICAM-1) were evaluated by Western blotting and immunohistochemistry staining, respectively. Myocardial nuclear factor-kappa B (NF-κB) activity was assayed by electrophoretic mobility shift assay. Myocardial CCR5 protein expression was significantly reduced in I/R + Pre group (P < 0.05 vs. I/R) and further reduced in I/R + CCR5Ab group (P < 0.05 vs. I/R + Pre). LVSP and ±dP/dt(max) were significantly lower while serum CK and TNF-α as well as myocardial MPO activity, ICAM-1 expression, and NF-κB activity were significantly higher in I/R group than in sham group (all P < 0.05), which were significantly reversed by I/R + Pre (all P < 0.05 vs. I/R) and I/R + CCR5Ab (all P < 0.05 vs. I/R + Pre) while aggravated by I/R + CCR5Ago (all P < 0.05 vs. I/R). Our results suggest that blocking CCR5 attenuates while enhancing CCR5 aggravates myocardial I/R injury through modulating inflammatory responses in rat heart.

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