title: Age decreased steady-state concentrations of genistein in plasma, liver, and skeletal muscle in Sprague-Dawley rats.
abstract: Soy isoflavones are associated with low incidence of cardiovascular diseases (CVD) and hormone-dependent cancers, but no solid information is available on the relative deposition of isoflavones in the body as a function of age. One-year-old (adult) male Sprague-Dawley rats were fed control diet or one of three high-genistein isoflavone (HGI) diets at a dose of 62, 154, or 308 genistein mg/kg (ppm) diet for 5 weeks; 2-year-old (old) were fed a dose of 154 or 308 ppm. Steady-state genistein concentrations in plasma, liver, and gastrocnemius muscle of the adult rats after 12 h fast revealed a linear dose-dependent manner (P < or = 0.0001). However, there was no such relationship in the old rats. Nevertheless, old rats fed the 308 ppm genistein diet had significantly lower steady-state genistein concentrations in plasma and liver than the adult rats did (P < or = 0.05); but similar genistein concentration in muscle. The results of this study indicate that steady-state genistein concentrations in tissues of adult rats after 12 h fast exhibited a dose-dependent fashion and were diminished in specific tissues by age.
authors.affiliation: Department of Human Nutrition, Foods & Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA. oliver.chen@tufts.edu
authors.forename: Chung-Yen
authors.initials: CY
authors.lastname: Chen
authors.forename: Raga M
authors.initials: RM
authors.lastname: Bakhiet
mesh_terms: D000375:Aging; D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology*; D001835:Body Weight; D002318:Cardiovascular Diseases / Q000188:drug therapy; D004305:Dose-Response Relationship, Drug; D019833:Genistein / Q000494:pharmacology*; D050356:Lipid Metabolism; D008099:Liver / Q000187:drug effects*; D008110:Liver Extracts / Q000378:metabolism; D008297:Male; D015233:Models, Statistical; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013025:Glycine max; D013997:Time Factors
chemical_list: D016588:Anticarcinogenic Agents; D008110:Liver Extracts; D019833:Genistein