title: Effects of pdgf-bb on rat dermal fibroblast behavior in mechanically stressed and unstressed collagen and fibrin gels.
abstract: The dose-response effects of platelet-derived growth factor BB (PDGF-BB) on rat dermal fibroblast (RDF) behavior in mechanically stressed and unstressed type I collagen and fibrin were investigated using quantitative assays developed in our laboratory. In chemotaxis experiments, RDFs responded optimally (P < 0.05) to a gradient of 10 ng/ml PDGF-BB in both collagen and fibrin. In separate experiments, the migration of RDFs and the traction exerted by RDFs in the presence of PDGF-BB (0, 0.1, 1, 10, or 100 ng/ml) were assessed simultaneously in the presence or absence of stress. RDF migration increased significantly (P < 0.05) at doses of 10 and 100 ng/ml PDGF-BB in collagen and fibrin in the presence and absence of stress. In contrast, the effects of PDGF-BB on RDF traction depended on the gel type and stress state. PDGF-BB decreased fibroblast traction in stressed collagen, but increased traction in unstressed collagen (P < 0.05). No statistical conclusion could be inferred for stressed fibrin, but increasing PDGF-BB decreased traction in unstressed fibrin (P < 0.05). These results demonstrate the complex response of fibroblasts to environmental cues and suggest that mechanical resistance to compaction may be a crucial element in dictating fibroblast behavior.
authors.affiliation: Departments of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, 55455
authors.forename: D I
authors.initials: DI
authors.lastname: Shreiber
authors.forename: P A
authors.initials: PA
authors.lastname: Enever
authors.forename: R T
authors.initials: RT
authors.lastname: Tranquillo
mesh_terms: D000818:Animals; D000077214:Becaplermin; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D002633:Chemotaxis / Q000187:drug effects / Q000502:physiology; D003094:Collagen / Q000494:pharmacology*; D003470:Culture Media / Q000494:pharmacology*; D020405:Dermis / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005337:Fibrin / Q000494:pharmacology*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D005782:Gels / Q000494:pharmacology*; D007091:Image Processing, Computer-Assisted / Q000379:methods; D010982:Platelet-Derived Growth Factor / Q000378:metabolism / Q000494:pharmacology*; D020574:Proto-Oncogene Proteins c-sis; D051381:Rats; D013314:Stress, Mechanical; D014945:Wound Healing / Q000187:drug effects / Q000502:physiology
chemical_list: D003470:Culture Media; D005782:Gels; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D000077214:Becaplermin; D005337:Fibrin; D003094:Collagen