title: Ultraviolet irradiation increases serum 1,25-dihydroxyvitamin D in vitamin-D-replete adults.
abstract: The production of vitamin D metabolites in response to ultraviolet irradiation has been studied in 5 control subjects and 8 patients with psoriasis; both groups responded similarly. Significant increases within the normal range were observed for serum 1,25-dihydroxyvitamin D; these increases were negatively related to the initial concentrations of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D. Serum 25-hydroxyvitamin D and 24,25-dihydroxyvitamin D increased linearly over the 21 days of study, the production of 25-hydroxyvitamin D being negatively correlated with its own initial concentration. The changes in vitamin D metabolism were accompanied by significant rises within the normal ranges in serum inorganic phosphorus and in urinary calcium. These results indicate the variation of 1,25-dihydroxyvitamin D occurs in vitamin-D-replete adults and that this variation is probably responsible for the observed alterations in calcium and phosphorus metabolism.
mesh_terms: D000328:Adult; D002112:Calcifediol / Q000097:blood; D004100:Dihydroxycholecalciferols / Q000097:blood*; D006801:Humans; D008875:Middle Aged; D010758:Phosphorus / Q000097:blood; D011565:Psoriasis / Q000097:blood / Q000378:metabolism / Q000532:radiotherapy; D014467:Ultraviolet Therapy; D014807:Vitamin D / Q000378:metabolism*
chemical_list: D004100:Dihydroxycholecalciferols; D014807:Vitamin D; D010758:Phosphorus; D002112:Calcifediol