title: The role of alpha and beta platelet-derived growth factor receptor in the vascular response to injury in nonhuman primates.
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.
authors: COR Therapeutics Inc, South San Francisco, USA.
authors: N A
authors: NA
authors: Giese
authors: M M
authors: MM
authors: Marijianowski
authors: O
authors: O
authors: McCook
authors: A
authors: A
authors: Hancock
authors: V
authors: V
authors: Ramakrishnan
authors: L J
authors: LJ
authors: Fretto
authors: C
authors: C
authors: Chen
authors: A B
authors: AB
authors: Kelly
authors: J A
authors: JA
authors: Koziol
authors: J N
authors: JN
authors: Wilcox
authors: S R
authors: SR
authors: Hanson
mesh_terms: D000818:Animals; D019138:Antibodies, Blocking / Q000494:pharmacology; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D002339:Carotid Arteries / Q000473:pathology; D020212:Carotid Artery Injuries; D002404:Catheterization; D002455:Cell Division / Q000276:immunology; D004691:Endarterectomy; D005263:Femoral Artery / Q000293:injuries* / Q000473:pathology; D008297:Male; D010215:Papio; D010766:Phosphorylation; D020796:Receptor, Platelet-Derived Growth Factor alpha; D020797:Receptor, Platelet-Derived Growth Factor beta; D017479:Receptors, Platelet-Derived Growth Factor / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D017539:Tunica Intima / Q000276:immunology / Q000473:pathology
chemical_list: D019138:Antibodies, Blocking; D000911:Antibodies, Monoclonal; D020796:Receptor, Platelet-Derived Growth Factor alpha; D020797:Receptor, Platelet-Derived Growth Factor beta; D017479:Receptors, Platelet-Derived Growth Factor