Expression of inflammatory factors in myocardium following coronary microembolization and effect of NF-kB inhibitor on the expression in rats / 第二军医大学学报

ABSTRACT

Objective To investigate the expression of inflammatory factors in myocardium following coronary microembolization (CME) and effect of NF-kB inhibitor on the expression. Methods CME models were created in 64 rats by injecting homologous microthrombotic particle suspension into the left ventricle with the ascending aorta clamped. The model rats were equally divided into untreated group and pyrrolidine dithiocarbamate (PDTC) treatment group; the animals were sacrificed at 1, 3, 7, and 14 days after operation. Another 24 SD rats served as sham controls. The distribution and dynamic changes of TNF-α, IL-6 and ICAM-1 mRNA expressionin myocardium were determined by in situ hybridization and immunohistochemistry. Results CME associated inflammation was not limited to the surroundings of the microembolization; it also involved a great deal of "innocent" myocardium, producing bystander effect. Myocardium expression of TNF-α, IL-6, and ICAM-1 in CME group was significantly higher than that in the sham control group (P<0.05). NF-kB inhibitor PDTC significantly inhibited TNF-α, IL-6 and ICAM-1 expression after CME (P<0.05). Conclusion CME can produce amplified myocardial inflammation, and NF-kB inhibitor PDTC can markedly ameliorate myocardial inflammation.