title: Differential roles of PDGFR-alpha and PDGFR-beta in angiogenesis and vessel stability.
abstract: Preclinical and clinical evaluations of individual proangiogenic/arteriogenic factors for the treatment of ischemic myocardium and skeletal muscle have produced unfulfilled promises. The establishment of functional and stable arterial vascular networks may require combinations of different angiogenic and arteriogenic factors. Using in vivo angiogenesis and ischemic hind-limb animal models, we have compared the angiogenic and therapeutic activities of fibroblast growth factor 2 (FGF-2) in combinations with PDGF-AA and PDGF-AB, two members of the platelet-derived growth factor (PDGF) family, with distinct receptor binding patterns. We show that both PDGF-AA/FGF-2 and PDGF-AB/FGF-2 in combinations synergistically induce angiogenesis in the mouse cornea. FGF-2 up-regulates PDGFR-alpha and -beta expression levels in the newly formed blood vessels. Interestingly, PDGF-AB/FGF-2, but not PDGF-AA/FGF-2, is able to stabilize the newly formed vasculature by recruiting pericytes, and an anti-PDGFR-beta neutralizing antibody significantly blocks PDGF-AB/FGF-2-induced vessel stability. These findings demonstrate that PDGFR-beta receptor is essential for vascular stability. Similarly, PDGF-AB/FGF-2 significantly induces stable collateral growth in the rat ischemic hind limb. The high number of collaterals induced by PDGF-AB/FGF-2 leads to dramatic improvement of the paw's skin perfusion. Immunohistochemical analysis of the treated skeletal muscles confirms that a combination of PDGF-AB and FGF-2 significantly induces arteriogenesis in the ischemic tissue. A combination of PDGF-AB and FGF-2 would be optimal proangiogenic agents for the treatment of ischemic diseases.
authors.affiliation: Division of Vascular Surgery, Department of Molecular Medicine and Surgery, Karolinska Institutet, SE-17176, Stockholm, Sweden.
authors.forename: Junhang
authors.initials: J
authors.lastname: Zhang
authors.forename: Renhai
authors.initials: R
authors.lastname: Cao
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Tanghong
authors.initials: T
authors.lastname: Jia
authors.forename: Yihai
authors.initials: Y
authors.lastname: Cao
authors.forename: Eric
authors.initials: E
authors.lastname: Wahlberg
mesh_terms: D000818:Animals; D001808:Blood Vessels / Q000187:drug effects; D003097:Collateral Circulation / Q000187:drug effects; D003315:Cornea / Q000098:blood supply / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004359:Drug Therapy, Combination; D016222:Fibroblast Growth Factor 2 / Q000008:administration & dosage / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology; D008297:Male; D051379:Mice; D018919:Neovascularization, Physiologic / Q000187:drug effects* / Q000502:physiology; D010982:Platelet-Derived Growth Factor / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D020796:Receptor, Platelet-Derived Growth Factor alpha / Q000378:metabolism*; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000378:metabolism*
chemical_list: D010982:Platelet-Derived Growth Factor; D016222:Fibroblast Growth Factor 2; D020796:Receptor, Platelet-Derived Growth Factor alpha; D020797:Receptor, Platelet-Derived Growth Factor beta