title: 1,25-Dihydroxyvitamin D3 increases collagen production in dermal fibroblasts.
abstract: The effect of 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) on proliferation and collagen type I and type III production in cultured human fibroblasts was examined. Previous studies have identified receptors for the vitamin in human dermal fibroblasts, and have suggested the skin to be a target tissue. While many studies examining keratinocyte modulation by 1,25-(OH)2D3 have been undertaken, very few have been performed on dermal fibroblasts. Neonatal foreskin fibroblast cultures were examined for cell number, extracellular collagen accumulation, and collagen mRNA levels, after 5 days exposure to 1,25-(OH)2D3 at a concentration of 10(-7) M. The vitamin significantly suppressed (P < 0.01) the proliferation of fibroblasts cultured in the presence of serum. Day 5 cell culture supernatants showed a significant per cell increase in collagen type I (P < 0.05) and type III (P < 0.01) as measured by ELISA. Type I collagen production in exposed cells was 11.64 + 0.531 microgram/10(6) cell vs. 9.53 + 0.500 microgram/10(6) cells in unexposed cells. Type III collagen production was 0.601 + 0.012 microgram/10(6) cell in exposed cells and 0.247 + 0.008 microgram/10(6) cells in unexposed cells. mRNA levels were increased after a 4-day exposure to 10(-7) M 1,25-(OH)2D3 for both type I (2.5-5-fold) and type III (5.5-7.76-fold) collagen. These results suggest a novel effect of increased collagen production by dermal fibroblasts upon exposure to 1,25-(OH)2D3 that is independent of proliferation.
authors.affiliation: Division of Plastic Surgery, University of California San Diego 92103-8890.
authors.forename: J
authors.initials: J
authors.lastname: Dobak
authors.forename: J
authors.initials: J
authors.lastname: Grzybowski
authors.forename: F T
authors.initials: FT
authors.lastname: Liu
authors.forename: B
authors.initials: B
authors.lastname: Landon
authors.forename: M
authors.initials: M
authors.lastname: Dobke
mesh_terms: D001345:Autoradiography; D015152:Blotting, Northern; D002117:Calcitriol / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D003094:Collagen / Q000096:biosynthesis* / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D005347:Fibroblasts / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D012333:RNA, Messenger / Q000032:analysis; D012867:Skin / Q000166:cytology / Q000187:drug effects*; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D012333:RNA, Messenger; D003094:Collagen; D002117:Calcitriol