title: Metabolism of tritiated C19 steroids by Shionogi mouse mammary tumors.
abstract: In the present report, the metabolism of dehydroepiandrosterone, 5-androstene-3 beta, 17 beta-diol and androstenedione has been studied in two different Shionogi tumors, one is androgen-dependent ("androgen sensitive") and grows in intact male mice and the other is apparently androgen-independent ("androgen insensitive") since the cells continue to grow in castrated antiandrogen (Flutamide) treated male animals. Our data clearly show that both the sensitive and insensitive tumors contain 3 beta-hydroxysteroid delta 5-delta 4 isomerase which causes the transformation of C19 steroids into potent androgenic steroids. However, the androgen sensitive tumor is able to convert 5-androstene-3 beta, 17 beta-diol into 2-hydroxyestrogens while the rate of conversion is extremely low in the insensitive tumor. Most interestingly, the production of 5 alpha-reduced steroids observed in both tissues was clearly higher in insensitive tumor homogenates.
mesh_terms: D000728:Androgens / Q000378:metabolism*; D000734:Androstenediols / Q000378:metabolism; D000735:Androstenedione / Q000378:metabolism; D000738:Androsterone / Q000378:metabolism; D000818:Animals; D002369:Castration; D003687:Dehydroepiandrosterone / Q000378:metabolism; D013196:Dihydrotestosterone / Q000378:metabolism; D004967:Estrogens / Q000378:metabolism; D005485:Flutamide / Q000494:pharmacology; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000378:metabolism*; D051379:Mice; D013251:Steroid Isomerases / Q000378:metabolism; D013739:Testosterone / Q000378:metabolism
chemical_list: D000728:Androgens; D000734:Androstenediols; D004967:Estrogens; D013196:Dihydrotestosterone; D013739:Testosterone; D000735:Androstenedione; D003687:Dehydroepiandrosterone; D005485:Flutamide; D000738:Androsterone; D013251:Steroid Isomerases