Repeated and targeted transfer of angiogenic plasmids into the infarcted rat heart via ultrasound targeted microbubble destruction enhances cardiac repair

Hiroko Fujii, Shu Hong Li, Jun Wu, Yasuo Miyagi, Terrence M. Yau, Harry Rakowski, Kensuke Egashira, Jian Guo, Richard D. Weisel, Ren Ke Li

    Research output: Contribution to journalArticlepeer-review

    92 Citations (Scopus)

    Abstract

    AimsUltrasound-targeted microbubble destruction (UTMD) uses ultrasound energy to selectively deliver genes into the myocardium using plasmids conjugated to microbubbles. We hypothesized that repeated delivery of stem cell-mobilizing genes could boost the ability of this therapy to enhance cardiac repair and ventricular function after a myocardial infarction.Methods and resultsBeginning 7 days after coronary artery ligation, stem cell factor (SCF) and stromal cell-derived factor (SDF)-1α genes were administered to adult rats using 1, 3, or 6 UTMD treatments (repeat 1, 3, and 6 groups) at 2-day intervals (control 6 treatments with empty plasmid). Cardiac function (echocardiography) and myocardial perfusion (myocardial contrast echocardiography) were assessed on Days-7, 0, and 24 relative to the first treatment. Histological and biochemical assessments were performed on Day 24. Multiple UTMD treatments were associated with an increased presence of myocardial SCF and SDF-1α proteins and their receptors (vs. control and Repeat 1). All UTMD recipients exhibited increased vascular densities and smaller infarct regions (vs. control), with the highest ventricular densities in response to multiple treatments. Myocardial perfusion and ventricular function at Day 24 also improved progressively (vs. control) with the number of UTMD treatments.ConclusionsTargeted ultrasound delivery of SCF and SDF-1α genes to the infarcted myocardium recruited progenitor cells and increased vascular density. Multiple UTMD treatments enhanced tissue repair, perfusion, and cardiac function. Repeated UTMD therapy may be applied to tailor the number of interventions required to optimize cardiac regeneration after an infarction.

    Original languageEnglish
    Pages (from-to)2075-2084
    Number of pages10
    JournalEuropean heart journal
    Volume32
    Issue number16
    DOIs
    Publication statusPublished - Aug 2011

    All Science Journal Classification (ASJC) codes

    • Cardiology and Cardiovascular Medicine

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