title: 17beta-estradiol enhances heparin-binding epidermal growth factor-like growth factor production in human keratinocytes.
abstract: Heparin-binding epidermal growth factor-like growth factor (HB-EGF) enhances reepithelialization in wounds. Estrogen is known to promote cutaneous wound repair. We examined the in vitro effects of 17beta-estradiol (E2) on HB-EGF production by human keratinocytes. E2 or membrane-impermeable BSA-conjugated E2 (E2-BSA) increased HB-EGF secretion, mRNA level, and promoter activity in keratinocytes. E2 or E2-BSA enhanced in vitro wound closure in keratinocytes, and the closure was suppressed by anti-HB-EGF antibody. Activator protein-1 (AP-1) and specificity protein 1 (Sp1) sites on HB-EGF promoter were responsible for the E2- or E2-BSA-induced transactivation. Antisense oligonucleotides against c-Fos, c-Jun, and Sp1 blocked E2- or E2-BSA-induced HB-EGF transactivation. E2 or E2-BSA enhanced DNA binding and transcriptional activity of AP-1 and generated c-Fos/c-Jun heterodimers by inducing c-Fos expression. E2 or E2-BSA enhanced DNA binding and transcriptional activity of Sp1 in parallel with the enhancement of Sp1 phosphorylation. These effects of E2 or E2-BSA were not blocked by the nuclear estrogen receptor antagonist ICI-182,780 or anti-estrogen receptor-alpha or -beta antibodies but were blocked by inhibitors of G protein, phosphatidylinositol-specific PLC, PKC-alpha, and MEK1. These results suggest that E2 or E2-BSA may enhance HB-EGF production via activation of AP-1 and Sp1. These effects of E2 or E2-BSA may be dependent on membrane G protein-coupled receptors different from nuclear estrogen receptors and on the receptor-mediated activities of phosphatidylinositol-specific PLC, PKC-alpha, and MEK1. E2 may enhance wound reepithelialization by promoting HB-EGF production in keratinocytes.
authors.affiliation: Dept. of Dermatology, Teikyo Univ., School of Medicine, 11-1, Kaga-2, Itabashi-Ku, Tokyo 173-8605, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Kanda
authors.forename: Shinichi
authors.initials: S
authors.lastname: Watanabe
mesh_terms: D000368:Aged; D002478:Cells, Cultured; D024202:Electrophoretic Mobility Shift Assay; D004815:Epidermal Growth Factor / Q000096:biosynthesis / Q000187:drug effects*; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D005434:Flow Cytometry; D066257:Heparin-binding EGF-like Growth Factor; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D015603:Keratinocytes / Q000187:drug effects* / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000187:drug effects; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012710:Serum Albumin, Bovine / Q000494:pharmacology; D016329:Sp1 Transcription Factor / Q000187:drug effects / Q000235:genetics; D018808:Transcription Factor AP-1 / Q000187:drug effects / Q000235:genetics; D015533:Transcriptional Activation / Q000187:drug effects; D014162:Transfection; D014945:Wound Healing / Q000187:drug effects*
chemical_list: C587883:HBEGF protein, human; D066257:Heparin-binding EGF-like Growth Factor; D036341:Intercellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D016329:Sp1 Transcription Factor; D018808:Transcription Factor AP-1; C043090:estradiol-bovine serum albumin; D012710:Serum Albumin, Bovine; D004958:Estradiol; D004815:Epidermal Growth Factor