title: The effects of indomethacin on arachidonic acid and prostaglandins e2 and f2alpha levels in human skin 24 h after u.v.B and u.v.C irradiation.
abstract: 1 Clinically normal human abdominal skin was irradiated with either three times its minimal erythema dose (MED) of ultraviolet B (u.v.B) or six MEDs of ultraviolet C (u.v.C) radiation. In both instances erythema was maximal at 24 h. 2 Exudate was recovered by a suction bulla technique from normal and irradiated skin at 24 h after irradiation. 3 Arachidonic acid, prostaglandins E2 and FSalpha, as measured by GC--MS, were significantly elevated at 24 h. Radioimmunoassay also showed increased PGF2alpha-like concentrations. 4 Oral indomethacin only partially reduced the erythema resulting from both types of radiation but totally suppressed the elevation of PGE 2 and F2alpha concentrations. 5 Topical indomethacin also suppressed u.v.B-induced increases in prostaglandins E2 and F2alpha. Unexpectedly, the vehicle alone produced a similar suppressive effect on prostaglandins although erythema appeared unaltered. 6 Most of the arachidonic acid metabolized by indomethacin-sensitive pathways is not converted to prostaglandins E2 and F2alpha in human skin.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001095:Arachidonic Acids / Q000378:metabolism*; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D005122:Exudates and Transudates / Q000032:analysis; D005260:Female; D006801:Humans; D007213:Indomethacin / Q000494:pharmacology*; D008297:Male; D013058:Mass Spectrometry; D008875:Middle Aged; D011458:Prostaglandins E / Q000378:metabolism*; D011460:Prostaglandins F / Q000378:metabolism*; D011863:Radioimmunoassay; D012867:Skin / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D001095:Arachidonic Acids; D011458:Prostaglandins E; D011460:Prostaglandins F; D007213:Indomethacin