title: Influence of endogenous reproductive hormones on F2-isoprostane levels in premenopausal women: the BioCycle Study.
abstract: Endogenous reproductive hormones and oxidative stress have been independently linked to risk of chronic disease but mostly in postmenopausal women. The interplay between endogenous reproductive hormones and oxidative stress among premenopausal women, however, has yet to be clearly elucidated. The objective of this study was to investigate the association between endogenous reproductive hormones and F(2)-isoprostanes in the BioCycle Study. Women aged 18-44 years from western New York State were followed prospectively for up to 2 menstrual cycles (n = 259) during 2005-2007. Estradiol, progesterone, luteinizing hormone, follicle-stimulating hormone, sex hormone-binding globulin, F(2)-isoprostanes, and thiobarbituric acid-reactive substances were measured up to 8 times per cycle at clinic visits timed by using fertility monitors. F(2)-Isoprostane levels had an independent positive association with estradiol (beta = 0.02, 95% confidence interval: 0.01, 0.03) and inverse associations with sex hormone-binding globulin and follicle-stimulating hormone (beta = -0.04, 95% confidence interval: -0.07, -0.003; beta = -0.02, 95% confidence interval: -0.03, -0.002, respectively) after adjustment for age, race, age at menarche, gamma-tocopherol, beta-carotene, total cholesterol, and homocysteine by inverse probability weighting. Thiobarbituric acid-reactive substances, a less specific marker of oxidative stress, had similar associations. If F(2)-isoprostanes are specific markers of oxidative stress, these results call into question the commonly held hypothesis that endogenous estradiol reduces oxidative stress.
authors.affiliation: Epidemiology Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, 6100 Executive Boulevard, 7B03M, Rockville, MD 20852, USA. schistee@mail.nih.gov
authors.forename: Enrique F
authors.initials: EF
authors.lastname: Schisterman
authors.forename: Audrey J
authors.initials: AJ
authors.lastname: Gaskins
authors.forename: Sunni L
authors.initials: SL
authors.lastname: Mumford
authors.forename: Richard W
authors.initials: RW
authors.lastname: Browne
authors.forename: Edwina
authors.initials: E
authors.lastname: Yeung
authors.forename: Maurizio
authors.initials: M
authors.lastname: Trevisan
authors.forename: Mary
authors.initials: M
authors.lastname: Hediger
authors.forename: Cuilin
authors.initials: C
authors.lastname: Zhang
authors.forename: Neil J
authors.initials: NJ
authors.lastname: Perkins
authors.forename: Kathleen
authors.initials: K
authors.lastname: Hovey
authors.forename: Jean
authors.initials: J
authors.lastname: Wactawski-Wende
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000097:blood / Q000652:urine; D028441:F2-Isoprostanes / Q000097:blood*; D005260:Female; D005298:Fertility / Q000502:physiology*; D012739:Gonadal Steroid Hormones / Q000097:blood / Q000652:urine; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology*; D018384:Oxidative Stress; D017697:Premenopause / Q000097:blood*; D011446:Prospective Studies; D055815:Young Adult
chemical_list: D015415:Biomarkers; D028441:F2-Isoprostanes; D012739:Gonadal Steroid Hormones