title: Genistein affects adipose tissue deposition in a dose-dependent and gender-specific manner.
abstract: The soy isoflavone genistein targets adipose tissue and elicits physiological effects that may vary based on dietary intake. We hypothesized that the adipose effects of genistein are dose and gender dependent. Four-week-old C57BL/6 male and female mice received daily oral doses of genistein (50-200,000 microg/kg.d) or 17beta-estradiol (E2) (5 microg/kg.d) for 15 d or a diet containing 800 ppm genistein. Genistein increased epididymal and renal fat pad and adipocyte size at doses up to 50,000 microg/kg.d or at 800 ppm in the diet in males but not in females. The alteration in adipocity correlated with changes in peripheral insulin resistance. These treatments increased genistein serum concentrations from 35+/-6 to 103+/-26 nM 12 h after treatment and lowered plasma triglycerides and cholesterol levels. The 200,000 microg/kg.d genistein dose decreased adipose tissue weight similarly to E2. This genistein dose down-regulated estrogen receptor (beta more than alpha) and progesterone receptor expression and induced estrogen-dependent adipose differentiation factors; it did not change expression of the minimal consensus estrogen-responsive element in ERE-tK-LUC mice, which was positively modulated in other tissues (e.g. the lung). E2 down-regulated almost all examined adipogenic factors. Gene microarray analysis identified factors in fat metabolism and obesity-related phenotypes differentially regulated by low and high doses of genistein, uncovering its adipogenic and antiadipogenic actions. The lower dose induced the phospholipase A2 group 7 and the phospholipid transfer protein genes; the 200,000 microg/kg.d dose inhibited them. The antiadipogenic action of genistein and down-regulation of adipogenic genes required the expression of ERbeta. In conclusion, nutritional doses of genistein are adipogenic in a gender-specific manner, whereas pharmacological doses inhibited adipose deposition.
authors.affiliation: 3rd Laboratory/Biotechnology, and Department of Diagnostics, Civic Hospital of Brescia, 25123 and Department of Pathology, University of Brescia, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Penza
authors.forename: C
authors.initials: C
authors.lastname: Montani
authors.forename: A
authors.initials: A
authors.lastname: Romani
authors.forename: P
authors.initials: P
authors.lastname: Vignolini
authors.forename: B
authors.initials: B
authors.lastname: Pampaloni
authors.forename: A
authors.initials: A
authors.lastname: Tanini
authors.forename: M L
authors.initials: ML
authors.lastname: Brandi
authors.forename: P
authors.initials: P
authors.lastname: Alonso-Magdalena
authors.forename: A
authors.initials: A
authors.lastname: Nadal
authors.forename: L
authors.initials: L
authors.lastname: Ottobrini
authors.forename: O
authors.initials: O
authors.lastname: Parolini
authors.forename: E
authors.initials: E
authors.lastname: Bignotti
authors.forename: S
authors.initials: S
authors.lastname: Calza
authors.forename: A
authors.initials: A
authors.lastname: Maggi
authors.forename: P G
authors.initials: PG
authors.lastname: Grigolato
authors.forename: D
authors.initials: D
authors.lastname: Di Lorenzo
mesh_terms: D017667:Adipocytes / Q000166:cytology; D000273:Adipose Tissue / Q000187:drug effects*; D000818:Animals; D001823:Body Composition / Q000187:drug effects*; D050218:Body Fat Distribution; D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects / Q000235:genetics; D048429:Cell Size / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004822:Epididymis; D047629:Estrogen Receptor beta / Q000502:physiology; D005260:Female; D020869:Gene Expression Profiling; D019833:Genistein / Q000008:administration & dosage / Q000494:pharmacology*; D007668:Kidney; D050155:Lipogenesis / Q000187:drug effects / Q000235:genetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D011960:Receptors, Estrogen / Q000235:genetics / Q000378:metabolism; D012727:Sex Characteristics
chemical_list: D047629:Estrogen Receptor beta; D011960:Receptors, Estrogen; D019833:Genistein