title: Nerve growth factor beta/pro-nerve growth factor and their receptors in normal human oral mucosa.
abstract: Nerve growth factor beta (NGF-beta) and its precursor proNGF are important for the differentiation and survival of neurons and dermal keratinocytes. The aim of this study was to determine the role that NGF might play in the differentiation and wound healing of oral mucosa. Cultured normal human oral mucosal keratinocytes expressed mRNA for NGF-beta/proNGF and for their receptors TrkA and p75(NTR). Lysates from cultured oral mucosal keratinocytes did not contain detectable amounts of mature 14-kDa NGF-beta but did contain several NGF proforms with molecular weights between 32 and 114 kDa. Culture medium from oral mucosal keratinocytes contained 75 kDa proNGF. The addition of NGF-beta significantly enhanced the proliferation of oral mucosal keratinocyte cultures and in vitro scratch closure. Immunostaining of biopsies from normal oral mucosa showed the presence of proNGF in all epithelial layers. NGF staining was observed in the granular and upper spinous cell layers. TrkA immunoreactivity was detected in basal and parabasal cells, with weak to moderate staining in spinous and granular cell layers. p75(NTR) staining was seen in basal cell layers. These findings indicate that NGF-beta/proNGF have mitogenic and motogenic effects on oral mucosal keratinocytes and therefore may aid in the healing of oral wounds. Differential expression of NGF and NGF receptors throughout the epithelium suggests a role in epithelial differentiation.
authors.affiliation: Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway.
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Hayashi
authors.forename: Trond
authors.initials: T
authors.lastname: Storesund
authors.forename: Olav
authors.initials: O
authors.lastname: Schreurs
authors.forename: Cuong
authors.initials: C
authors.lastname: Khuu
authors.forename: Camilla
authors.initials: C
authors.lastname: Husvik
authors.forename: Andreas
authors.initials: A
authors.lastname: Karatsaidis
authors.forename: Kristen
authors.initials: K
authors.lastname: Helgeland
authors.forename: Dionisio
authors.initials: D
authors.lastname: Martin-Zanca
authors.forename: Karl
authors.initials: K
authors.lastname: Schenck
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002454:Cell Differentiation; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D006651:Histocytochemistry; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000378:metabolism; D009061:Mouth Mucosa / Q000166:cytology / Q000378:metabolism*; D020932:Nerve Growth Factor / Q000096:biosynthesis / Q000494:pharmacology / Q000502:physiology*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000502:physiology; D011498:Protein Precursors / Q000096:biosynthesis* / Q000502:physiology; D051381:Rats; D020917:Receptor, trkA / Q000096:biosynthesis* / Q000502:physiology; D017475:Receptors, Nerve Growth Factor / Q000096:biosynthesis* / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014945:Wound Healing / Q000502:physiology
chemical_list: C484065:NGFR protein, human; D009419:Nerve Tissue Proteins; D011498:Protein Precursors; D017475:Receptors, Nerve Growth Factor; C061397:pro-nerve growth factor, human; D020932:Nerve Growth Factor; D020917:Receptor, trkA