(Circulation. 1999;99:1776-1779.)
© 1999 American Heart Association, Inc.
Brief Rapid Communications |
From the Division of Cardiovascular Research, St Elizabeth's Medical Center, Tufts University School of Medicine, Boston, Mass (Z.L., M.S., T.N., K.W.), and Genzyme Corp, Framingham, Mass (J.M.K, G.Y.A).
Correspondence to Dr Kenneth Walsh, Division of Cardiovascular Research, St Elizabeth's Medical Center, 736 Cambridge St, Boston, MA 02135. E-mail kwalsh{at}opal.tufts.edu
Abstract
BackgroundAdenoviral constructs have been used for studies of injury-induced vascular hyperplasia in immunologically naive laboratory animals, but their usefulness for intra-arterial gene therapy may be limited by the prevalence of preexisting immunity to adenovirus in the patient population. Here, we explored the efficacy of adenovirus-mediated transfer of Fas ligand, a cytotoxic gene with immunomodulatory properties, in inhibiting injury-induced vascular lesion formation in both naive and immunologically primed animals.
Methods and ResultsLesion formation was evaluated in balloon-injured carotid arteries of naive and adenovirus-immunized rats that were infected with adenoviral constructs expressing Fas ligand (Ad-FasL), the cyclin-dependent kinase inhibitor p21 (Ad-p21), or ß-galactosidase (Ad-ßgal). In naive rats, Ad-FasL induced apoptosis in medial vascular smooth muscle cells and inhibited intimal hyperplasia by 60% relative to Ad-ßgaltreated vessels (P<0.05), whereas the cytostatic agent Ad-p21 decreased lesion size by 58% (P<0.05). In animals preimmunized with an adenoviral vector containing no transgene, Ad-FasL significantly inhibited neointima formation (73% reduction, P<0.05), but Ad-p21 failed to inhibit neointima formation relative to controls. Immunologically primed rats displayed robust T-cell infiltration in Ad-p21 and Ad-ßgaltreated vessels, but T-cell infiltration was markedly attenuated in Ad-FasLtreated vessels.
ConclusionsOur data demonstrate that adenovirus-mediated Fas ligand delivery can inhibit intimal hyperplasia in both immunologically primed and naive animals, whereas the efficacy of an adenovirus-mediated p21 delivery is limited to immunologically naive animals. This study documents, for the first time, the therapeutic efficacy of intravascular adenoviral gene transfer in animals with preexisting immunity to adenovirus.
Key Words: restenosis genes viruses lymphocytes
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