title: Localization of 3H-diethylstilbestrol in skeletal muscle.
abstract: The localization of diethylstilbestrol (DES) in skeletal muscle was studied in CF1 mice and perfused rat hindlimbs. There was a slow accumulation of 3H-DES in mouse muscle from 4 to 24 hours following i.p. injection even though plasma DES was decreasing. Twenty-four hours after injection of 50 microCi 3H-DES (714 pmole) mouse gastrocnemius contained 8.9 x 10(-17) mole unaltered 3H-DES per mg muscle. Extrapolating to the entire skeletal muscle mass of the animal, this represents 0.15% of the radioactivity injected. The radioactivity in muscle was completely extracted with 95% ethanol or ether: ethanol (3:1), and both unaltered DES and DES-metabolites were present in the extracts. The fraction of radioactivity due to unaltered DES 4 hours after injection was 0.51 +/- 0.09 in muscle and 0.30 +/- 0.11 in plasma. Significant extrahepatic metabolism of DES was demonstrated in perfused isolated rat hindlimbs by the presence of DES-metabolites in the perfusate. The radioactivity extracted from the perfused muscle itself was unaltered DES. These results indicate that skeletal muscle is an important site of DES localization in rodents.
mesh_terms: D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D004054:Diethylstilbestrol / Q000378:metabolism*; D005965:Glucuronates / Q000378:metabolism; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009132:Muscles / Q000378:metabolism*; D011485:Protein Binding; D011960:Receptors, Estrogen / Q000378:metabolism; D014316:Tritium
chemical_list: D001798:Blood Proteins; D005965:Glucuronates; D011960:Receptors, Estrogen; D014316:Tritium; D004054:Diethylstilbestrol