Study on attenuation of miR-1-mediated ischemia-induced arrhythmias and infarction in rats by means of fulvning granule

Patients post myocardial infarction (MI) have a high incidence of frequent and complex ventricular arrhythmias. miR-1 is involved in ischemia-induced arrhythmias. Fulvning Granule (FG) is a prescription for treating ischemia-induced arrhythmias. This research investigated therapeutic effect of FG on ischemia-induced arrhythmias in an depth way, focusing on expression of miR-1. 60 healthy Sprague Dawly rats were assigned to operation group, MI+normal saline group, MI+low dose of FG group, MI+moderate dose of FG group and MI+high dose of FG group, MI+propranolol group and MI+moderate dose of FG+propranolol group. Hemodynamic measurement, arrhythmia classification, infarct area evaluation and miR-1 level quantification with expression of PKA and SRF were adopted 4 weeks after operation. FG improved hemodynamic indexes and inhibited expression of miR-1. The optimal dose of FG was medium ( P < 0.05). Combination of FG and propranolol further improved the hemodynamics indexes and inhibited the expression of miR-1, PKA and SRF ( P < 0.05). FG regulated miR-1 expression via inhibition of Protein Kinase A (PKA) and serum response factor (SRF) expressions. Meanwhile, β -adrenoceptor/PKA signaling pathway played a role in regulating miR-1 expression, while Fulvning granule combined with propranolol and showed an antiarrhythmic role and improved cardiac function after myocardial infarction.