title: Two forms of ornithine decarboxylase activity in mouse kidney.
abstract: Renal ornithine decarboxylase (ODC) activity was evaluated in normal female, male, testosterone-treated female and androgen-insensitive Tfm/Y mice for its heat sensitivity and in vivo half-life. ODC activity in normal female kidney consisted of 2 forms which differed in their heat sensitivity at 46 degrees C. Androgens, either endogenous in normal males or administered exogenously to females, induced primarily the heat-sensitive form. Results from mixing experiments indicated that the heat-sensitive form represented a change in the property of the ODC activity rather than a change in cytoplasmic factors. The in vivo half-life of ODC activity was increased slightly in males and short-term androgen-treated females over normal females and was markedly increased by prolonged androgen treatment. In vivo, the androgen-induced, heat-sensitive form decayed faster than did the heat-resistant form. We conclude that androgens have specific effects on both the amount as well as the biochemical properties of ODC activity in mouse kidney.
mesh_terms: D000818:Animals; D003513:Cycloheximide / Q000494:pharmacology; D003600:Cytosol / Q000201:enzymology; D005260:Female; D006207:Half-Life; D006358:Hot Temperature; D007668:Kidney / Q000187:drug effects / Q000201:enzymology*; D007700:Kinetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009955:Ornithine Decarboxylase / Q000378:metabolism*; D011489:Protein Denaturation / Q000187:drug effects; D013739:Testosterone / Q000494:pharmacology*
chemical_list: D013739:Testosterone; D003513:Cycloheximide; D009955:Ornithine Decarboxylase