title: The induction of epidermal ornithine decarboxylase following tape stripping is inhibited by a topical vitamin D3 analogue (MC903).
abstract: The efficacy of MC903, a vitamin D3 analogue, in reducing hyperproliferation as determined by levels of ornithine decarboxylase (ODC) was investigated in a double-blind study of 15 patients with chronic plaque psoriasis. The lesions of psoriasis were treated for 8 weeks with MC903 in one of two different cream bases or with a placebo cream. Biopsies were taken before and after treatment. In addition an uninvolved area of skin was treated during the last 3 weeks and this as well as control areas were then sellotape stripped and biopsied after 8 h. Clinical improvement was seen in eight out of 11 patients treated with MC903 but there was no reduction in the level of ODC in psoriatic lesions after 8 weeks of treatment. The levels of ODC in the tape-stripped uninvolved skin after 3 weeks of treatment with MC903 averaged 22.5 +/- 4.2 pmol/min/mg protein as compared to 58.6 +/- 12.6 pmol/min/mg protein (P = 0.004). The trauma-induced induction of ODC activity was markedly inhibited by the application of MC903.
authors.affiliation: Department of Dermatology, University Hospital Nijmegen, The Netherlands.
authors.forename: W P
authors.initials: WP
authors.lastname: Arnold
authors.forename: P C
authors.initials: PC
authors.lastname: van de Kerkhof
mesh_terms: D000328:Adult; D002117:Calcitriol / Q000031:analogs & derivatives* / Q000627:therapeutic use; D002908:Chronic Disease; D004311:Double-Blind Method; D004790:Enzyme Induction / Q000187:drug effects; D004817:Epidermis / Q000201:enzymology / Q000293:injuries*; D005260:Female; D006801:Humans; D008297:Male; D009955:Ornithine Decarboxylase / Q000378:metabolism*; D011565:Psoriasis / Q000188:drug therapy* / Q000201:enzymology
chemical_list: C055085:calcipotriene; D009955:Ornithine Decarboxylase; D002117:Calcitriol