title: Transforming growth factor-alpha: a major human serum factor that promotes human keratinocyte migration.
abstract: In unwounded skin, human keratinocytes (HKs) are in contact with a plasma filtrate. In an acute wound, HKs come in contact with serum for the first time. Because human serum (HS), but not plasma, promotes HK migration, we speculated that a major HK pro-motility factor in vivo comes from serum. In this study, we compared all of the published growth factors (GFs), reported to promote HK migration, with HS. No single GF could duplicate the HK pro-motility activity in HS. Among these GFs, transforming growth factor-alpha [corrected] showed the highest HK pro-motility activity, reaching approximately 80% of the activity in HS. The order of potency was: TGFalpha > insulin > EGF > heparin binding (HB)-EGF > IGF-1 > basic fibroblast growth factor >IL-8 > HGF > IL-1 > KGF>TGFbeta. Interestingly, the combination of TGFalpha and insulin could duplicate the HK pro-motility activity in HS, although only the TGFalpha, but not insulin, levels increase in serum over plasma. Addition of neutralizing antibodies against TGFalpha to serum or depletion of TGFalpha from serum by immunoprecipitation significantly abolished its HK pro-motility activity. Plasma with added TGFalpha stimulated HK migration that reached more than 80% of the serum stimulation. Since insulin levels are identical between plasma and serum, we propose that TGFalpha is the physiologic HK pro-motility factor in HS.
authors.affiliation: Department of Dermatology and the USC/Norris Comprehensive Cancer Center, USC Laboratory for Investigative Dermatology, University of Southern California Keck School of Medicine, Los Angeles, USA.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.forename: Jianhua
authors.initials: J
authors.lastname: Fan
authors.forename: Mei
authors.initials: M
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: David T
authors.initials: DT
authors.lastname: Woodley
mesh_terms: D002465:Cell Movement / Q000187:drug effects* / Q000502:physiology*; D002478:Cells, Cultured; D004815:Epidermal Growth Factor / Q000494:pharmacology; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology; D051523:Fibroblast Growth Factor 7 / Q000494:pharmacology; D066257:Heparin-binding EGF-like Growth Factor; D017228:Hepatocyte Growth Factor / Q000494:pharmacology; D006801:Humans; D007004:Hypoglycemic Agents / Q000494:pharmacology; D007328:Insulin / Q000494:pharmacology; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology; D036341:Intercellular Signaling Peptides and Proteins; D007375:Interleukin-1 / Q000494:pharmacology; D016209:Interleukin-8 / Q000494:pharmacology; D015603:Keratinocytes / Q000166:cytology* / Q000187:drug effects; D010949:Plasma; D044967:Serum; D016211:Transforming Growth Factor alpha / Q000097:blood* / Q000494:pharmacology*; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D014945:Wound Healing / Q000502:physiology
chemical_list: C587883:HBEGF protein, human; D066257:Heparin-binding EGF-like Growth Factor; D007004:Hypoglycemic Agents; D007328:Insulin; D036341:Intercellular Signaling Peptides and Proteins; D007375:Interleukin-1; D016209:Interleukin-8; D016211:Transforming Growth Factor alpha; D016212:Transforming Growth Factor beta; D016222:Fibroblast Growth Factor 2; D051523:Fibroblast Growth Factor 7; D004815:Epidermal Growth Factor; D017228:Hepatocyte Growth Factor; D007334:Insulin-Like Growth Factor I