© 1999 American Heart Association, Inc.
Original Contributions |
The Role of Alpha and Beta Platelet-Derived Growth Factor Receptor in the Vascular Response to Injury in Nonhuman Primates
From COR Therapeutics Inc (N.A.G., O.M., A.H., V.R., L.J.F.), South San Francisco; Department of Molecular and Experimental Medicine (J.A.K.), Scripps Research Institute, LaJolla, Calif; and Division of Hematology-Oncology, Department of Medicine (M.M.H.M., A.B.K., J.N.W., S.R.H.) and Department of Surgery (C.C.), Yerkes Regional Primate Research Center, Emory University, Atlanta, Ga.
Correspondence to Stephen R. Hanson, PhD, 1639 Pierce Dr, Room 1129 Woodruff Memorial Bldg, Emory University, Atlanta, GA, 30322. E-mail shanson{at}emory.edu
Abstract—Restenosis remains a significant clinical problem associated with mechanical interventional procedures for arterial revascularization or repair, including coronary angioplasty and stenting. Studies with rodents have established that platelet-derived growth factor (PDGF), a potent chemotactic and mitogenic agent for vascular smooth muscle cells, is a key mediator of lesion formation after vascular injury. To further explore this hypothesis in a more clinically relevant model, neutralizing monoclonal antibodies (mAbs) were used to examine the effect of selective inhibition of alpha or beta PDGF receptor (PDGFR) on neointima formation in nonhuman primates. Carotid arteries were injured by surgical endarterectomy and femoral arteries by balloon catheter dilatation. Immunostaining revealed that both injuries induced cell proliferation and the upregulation of beta PDGFR but not alpha PDGFR. By 7 days after injury, beta PDGFR staining was limited to the luminal region of the media, the small areas of neointima, and the adventitia. Nearly all bromodeoxyuridine-positive cells were found in these regions as well. After 30 days, a concentric neointima that stained strongly for beta PDGFR had formed in the carotid and femoral arteries. Treatment of baboons with anti-beta PDGFR mAb 2A1E2 for 6 days after injury reduced the carotid artery and femoral artery lesion sizes by 37% (P<0.05) and 48% (P<0.005), respectively, when measured at 30 days. Under the same conditions, treatment with anti-alpha PDGFR mAb 2H7C5 had no effect. These findings suggest that PDGF mediates neointima formation through the beta PDGFR, and that antagonism of this pathway may be a promising therapeutic strategy for reducing clinical restenosis.
Key Words: angioplasty • endarterectomy • tyrosine kinase • smooth muscle cell • monoclonal antibody
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