doi: 10.1161/hc0102.101369
(Circulation. 2002;105:79.)
© 2002 American Heart Association, Inc.
Basic Science Reports |
Adenovirus-Mediated Heme Oxygenase-1 Gene Expression Stimulates Apoptosis in Vascular Smooth Muscle Cells
From Houston VA Medical Center and the Departments of Medicine (X.L., G.B.C., H.W., W.D.) and Pharmacology (W.D.), Baylor College of Medicine, Houston, Tex.
Correspondence to William Durante, PhD, Houston VA Medical Center, Building 109, Room 130, 2002 Holcombe Blvd, Houston, TX 77030. E-mail wdurante{at}bcm.tmc.edu
Background— Heme oxygenase-1 (HO-1) catalyzes the degradation of heme into biliverdin, iron, and carbon monoxide (CO). Although HO-1 is induced in vascular smooth muscle cells (SMCs), the biological role of HO-1 in these cells has not been completely characterized.
Methods and Results— In the present study, we overexpressed HO-1 in rat aortic SMCs by generating a recombinant defective adenovirus containing the rat HO-1 gene (AdHO-1) and examined the effect on SMC proliferation. Infection of SMCs with AdHO-1 resulted in a dose-dependent increase in the expression of HO-1 mRNA, protein, and activity. Infection of SMCs with AdHO-1 inhibited serum-stimulated SMC proliferation in a dose-dependent manner. In contrast, the control adenovirus expressing the green fluorescent protein failed to induce HO-1 expression and had minimal effects on SMC growth. Infection with AdHO-1 stimulated SMC apoptosis in a dose-dependent fashion, as demonstrated by DNA fragmentation, positive annexin V labeling, and caspase-3 activation. HO-1–mediated apoptosis was associated with a marked increase in the expression of the proapoptotic protein p53. Finally, the exogenous administration of biliverdin and bilirubin stimulated SMC apoptosis. In contrast, the administration of CO or iron failed to induce cell death.
Conclusions— These results demonstrate that overexpression of HO-1 or the exogenous administration of biliverdin or bilirubin stimulates SMC apoptosis. Adenovirus-mediated transfer of the HO-1 gene may provide a novel therapeutic approach in treating occlusive vascular disease.
Key Words: oxygenase • apoptosis • muscle, smooth • biliverdin • bilirubin
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