title: Sex-related difference in vitamin D3 25-hydroxylase of rat liver microsomes.
abstract: Cholecalciferol 25-hydroxylase was partially purified by polyethylene glycol fractionation and chromatographies on octylamino-Sepharose and hydroxylapatite columns starting from the liver microsomes of female rats, and compared with P-450cc25 purified from the liver microsomes of male rats (Hayashi, et al. (1986) J. Biochem. 99, 1753-1763). On octylamino-Sepharose 4B column chromatography, most of the activity was recovered in the fraction eluted with 0.08% Emulgen 913 in the case of the male enzyme, whereas the female enzyme was recovered in the fraction eluted with 0.2% Emulgen. Anti-cc25 antibodies against purified male P-450cc25 inhibited the 25-hydroxylation activity of male polyethylene glycol (PEG) fraction and partially purified male enzyme, but did not inhibit the activities of the corresponding female fractions. The antibodies formed a single precipitation line with male P-450cc25, but did not form a precipitation line with partially purified female 25-hydroxylase on immuno-diffusion. These observations indicated that the vitamin D3 25-hydroxylase in female rat liver microsomes is a different entity from that of male rats.
mesh_terms: D000818:Animals; D000906:Antibodies; D001189:Aryl Hydrocarbon Hydroxylases; D053493:Cholestanetriol 26-Monooxygenase; D002845:Chromatography / Q000379:methods; D005260:Female; D005779:Immunodiffusion; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology*; D051381:Rats; D011919:Rats, Inbred Strains; D012737:Sex Factors; D013250:Steroid Hydroxylases / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D000906:Antibodies; D013250:Steroid Hydroxylases; D001189:Aryl Hydrocarbon Hydroxylases; C022724:testosterone 7-alpha-hydroxylase, hamster; D053493:Cholestanetriol 26-Monooxygenase