5 alpha-reductase activity in rat adipose tissue.
We measured the 5 alpha-reductase activity in isolated cell preparations of rat adipose tissue using the formation of [3H]dihydrotestosterone from [3H]testosterone as an endpoint. Stromal cells were prepared from the epididymal fat pad, perinephric fat, and subcutaneous fat of male rats and from perinephric fat of female rats. Adipocytes were prepared from the epididymal fat pad and perinephric fat of male rats. Stromal cells from the epididymal fat pad and perinephric fat contained greater 5 alpha-reductase activity than did the adipocytes from these depots. Stromal cells from the epididymal fat pad contained greater activity than those from perinephric and subcutaneous depots. Perinephric stromal cells from female rats were slightly more active than those from male rats. Estradiol (10(-8) M), when added to the medium, caused a 90% decrease in 5 alpha-reductase activity. Aromatase activity was minimal, several orders of magnitude less than 5 alpha-reductase activity in each tissue studied.
Zyirek
M
M
Department of Obstetrics/Gynecology, University of Massachusetts Medical School, Worcester 01605.
Flood
C
C
Longcope
C
C
D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase / Q000378:metabolism*; D000273:Adipose Tissue / Q000201:enzymology*; D000818:Animals; D001141:Aromatase / Q000378:metabolism; D013196:Dihydrotestosterone / Q000378:metabolism; D004958:Estradiol / Q000494:pharmacology; D005260:Female; D007700:Kinetics; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013739:Testosterone / Q000378:metabolism
D013196:Dihydrotestosterone; D013739:Testosterone; D004958:Estradiol; D001141:Aromatase; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase