title: The effect of collagen-targeting platelet-derived growth factor on cellularization and vascularization of collagen scaffolds.
abstract: Platelet-derived growth factor BB (PDGF-BB) was an important inductive factor during wound healing, but the lack of efficient delivery system limited its clinical application. Here, a peptide of seven amino acids was firstly utilized to engineer PDGF-BB to construct a collagen-targeting system. This peptide functioned as collagen-binding domain (CBD) to specially target the PDGF-BB to the collagen and restrict its diffusion. In our study, in vitro activity assay showed that the CBD-fused PDGF (CBD-PDGF) and native PDGF (NAT-PDGF) possessed similar activity to stimulate the human fibroblast proliferation. As expected, this peptide promoted the binding of PDGF to collagen scaffolds, and CBD-PDGF caused more cells to proliferate on the collagen gel than NAT-PDGF when the same amounts of PDGF were added. In the in vivo experiment, CBD-PDGF-loaded collagen scaffolds were uniformly cellularized and vascularized compared to that of NAT-PDGF-loaded scaffolds. Our study demonstrated that the CBD targeted PDGF to the collagen scaffold to exert its functions, and it suggested this could be an effective system for targeting tissue regeneration and wound repair.
authors.affiliation: Key laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 3 Nanyitiao, Zhongguancun, Beijing 100080, People's Republic of China.
authors.forename: Hang
authors.initials: H
authors.lastname: Lin
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.forename: Wenjie
authors.initials: W
authors.lastname: Sun
authors.forename: Wenxue
authors.initials: W
authors.lastname: Zhao
authors.forename: Yannan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Jianwu
authors.initials: J
authors.lastname: Dai
mesh_terms: D000818:Animals; D000077214:Becaplermin; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism* / Q000648:ultrastructure; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D048091:Guided Tissue Regeneration / Q000379:methods; D006801:Humans; D018919:Neovascularization, Physiologic; D010455:Peptides / Q000235:genetics / Q000378:metabolism*; D010982:Platelet-Derived Growth Factor / Q000235:genetics / Q000378:metabolism*; D020574:Proto-Oncogene Proteins c-sis; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012867:Skin / Q000166:cytology / Q000473:pathology; D014945:Wound Healing
chemical_list: D010455:Peptides; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D011993:Recombinant Fusion Proteins; D000077214:Becaplermin; D003094:Collagen