Dipyridamole directly inhibits vascular smooth muscle cell proliferation in vitro and in vivo: Implications in the treatment of restenosis after angioplasty

Jai Pal Singh, Kimberly J. Rothfuss, Todd R. Wiernicki, William B. Lacefield, L. Kurtz, Raymond F. Brown, Kellie A. Brune, Dianna Bailey, Gregory P. Dubé

Research output: Contribution to journalArticle

42 Scopus citations


Objectives. The effect of dipyridimole on smooth muscle cell proliferation and prevention of intimal thickening after arterial injury was investigated. Background. In addition to antiplatetet activity, dipyridamole also inhibits cell proliferation. We examined whether the antiproliferative action of dipyridamole on smooth muscle cells, as demonstrated here, has a direct effect on intimal thickening after vascular injury. Methods. Cell proliferation was determined by measuring deoxyribonucleic acid (DNA) synthesis and by cell counting. The in vivo effect of locally delivered dipyridamole was determined in a rabbit model with carotid or femoral artery injury. Results. Dipyridamole produced a dose-dependent inhibition of smooth muscle cell proliferation, producing 50% inhibition at 7 μg/ml. Structural analogues SH-869 and mopamidol were 10 to 100 times less effective than dipyridamole, suggesting that cell growth inhibition may be unrelated to the antiplatetet activity of dipyridamole. Inhibition of cell proliferation by dipyridamole was attenutated by increasing the serum concentration in the culture medium.Bypassing serum by local delivery of dipyridamole at the periadventitial site produced 63% inhibition (p < 0.05) of cell replication in balloon-injured arteries. Locally delivered dipyrldamole also inhibited intimal thickening (20%, p < 0.05) after balloon injury. Conclusions. Dipyridamole inhibited smooth muscle cell proliferation in vitro. This activity was attenuated by serum proteins. Locally delivered dipyridamole inhibited cell replication in arteries and intimal thickening after balloon injury. These results suggest that although systemic treatment with dipyridamole may not be efficacious because of inadequate serum levels, its antiproliferative action on smooth muscle cells may reduce restenosis when the drug is delivered locally after coronary angioplasty.

Original languageEnglish (US)
Pages (from-to)665-671
Number of pages7
JournalJournal of the American College of Cardiology
Issue number3
StatePublished - Mar 1 1994

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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