Comparison of Intracoronary and Intravenous Ultrasound-targeted Microbubble Destruction–mediated Ang1 Gene Transfection on Left Ventricular Remodeling in Canines With Acute Myocardial Infarction

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Abstract

Intravenous ultrasound-targeted microbubble destruction (IV-UTMD) has made distinct but limited progress in gene therapy. Intracoronary (IC) injection may lead to more gene transfection than IV injection. This study compared the therapeutic effects of IC-UTMD–mediated and conventional IV-UTMD–mediated gene transfection in acute myocardial infarction (MI). A canine MI model was successfully established through transcatheter coronary artery embolism, and the animals were divided into several treatment groups: IC injection with UTMD and the negative control plasmid (IC-UTMD); IC injection of the angiopoietin 1 (Ang1) plasmid (IC-Ang1); IC injection with UTMD and the Ang1 plasmid (IC-UTMD-Ang1); and IV injection with UTMD and the Ang1 plasmid (IV-UTMD-Ang1). At 12 hours after injection, more green fluorescence was observed from the fluorescein isothiocyanate-labeled Ang1 plasmid in the IC-UTMD-Ang1 group. After 1 month, compared with the IV-UTMD-Ang1 group, echocardiography showed that the IC-UTMD-Ang1 group exhibited increased left ventricular systolic function and myocardial infusion, with lower fibrous tissue levels and higher blood vessel density and Ang1 mRNA and protein levels. Similar cardiac troponin I and N-terminal pro-B type natriuretic peptide levels were observed in all groups. Compared with IV-UTMD, IC-UTMD can enhance Ang1 plasmid transfection efficiency after MI, promote gene expression and angiogenesis, and improve left ventricular remodeling without decreasing safety.

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