The effect of oligonucleotides to c-myb on vascular smooth muscle cell proliferation and neointima formation after porcine coronary angioplasty

Julian Gunn, Cathy M. Holt, Sheila E. Francis, Lynda Shepherd, Malcolm Grohmann, Christopher M H Newman, David C. Crossman, David C. Cumberland

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Proto-oncogenes, including c-myb, are expressed early after vascular injury. The application of antisense oligodeoxynucleotides (AS-ODNs) against these genes inhibits cell proliferation and neointima formation in small animals and in peripheral arteries. The aim of this study was to investigate the specificity of action of AS-ODN c-myb in vitro and to assess its effect, when delivered locally, on neointima formation after percutaneous transluminal coronary angioplasty (PTCA) in porcine coronary arteries. AS- ODN-c-myb inhibited the proliferation of vascular smooth muscle cells (VSMCs) in vitro in a dose-dependent manner. There was a corresponding reduction in steady state levels of c-myb mRNA and protein. Expression of another early gene, c-fos, was unaffected. S1 nuclease analysis demonstrated intact full- length AS-ODN-c-myb retrieved from VSMCs in culture after 12 hours. A range of ODNs, related and unrelated to c-myb, with and without a GGGG sequence, inhibited VSMC proliferation. Phosphorothioated AS-ODN-c-myb was 30 times less potent than unphosphorothioated AS-ODN-c-myb. PTCA induced porcine coronary artery neointima formation. c-myb mRNA was maximally induced 18 hours after injury. Unmodified AS-ODN-c-myb, sense-ODN-c-myb, saline, or nothing was delivered immediately after balloon dilatation via a double- skinned porous balloon (Transport, SciMed). Fluorescence-labeled AS-ODN-c- myb was deposited throughout the vessel wall. Mean maximum intima/media cross-sectional area 4 weeks after PTCA was reduced with AS-ODN-c-myb by 79% compared with saline (P
    Original languageEnglish
    Pages (from-to)520-531
    Number of pages11
    JournalCirculation research
    Volume80
    Issue number4
    Publication statusPublished - 1997

    Keywords

    • antisense oligomer
    • c-myb
    • local delivery
    • restenosis
    • smooth muscle cell proliferation

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