Serum antioxidants are associated with serum reproductive hormones and ovulation among healthy women

Sunni L. Mumford, Richard W. Browne, Karen C. Schliep, Jonathan Schmelzer, Torie C. Plowden, Kara A. Michels, Lindsey A. Sjaarda, Shvetha M. Zarek, Neil J. Perkins, Lynne C. Messer, Rose G. Radin, Jean Wactawski-Wende, Enrique F. Schisterman

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Background: Evidence is growing that the equilibrium between reactive oxygen species and antioxidants plays a vital role in women's reproductive health. Objective: The objective of this study was to evaluate variations in serum antioxidant concentrations across the menstrual cycle and associations between antioxidants and reproductive hormones and anovulation among healthy women. Methods: The BioCycle Study, a prospective cohort, followed 259 women aged 18-44 y for up to 2 menstrual cycles. Serum fat-soluble vitamin and micronutrient (α-tocopherol, γ-tocopherol, retinol, lutein, lycopene, and β-carotene), ascorbic acid, and reproductive hormone concentrations were measured 5-8 times/cycle. We used weighted linear mixed models to assess associations between antioxidants and hormone concentrations, after adjustment for age, race, body mass index, parity, sleep, pain medication use, total energy intake, concurrent hormones, serum cholesterol, F2-isoprostanes, and other antioxidants. Generalized linear models were used to identify associations with anovulation. Results: Serum antioxidant concentrations varied across the menstrual cycle. Retinol and a-tocopherol were associated with higher estradiol [RR: 1.00 pg/mL (95% CI: 0.67, 1.34 pg/mL); RR: 0.02 pg/mL (95% CI: 0.003, 0.03 pg/mL), respectively] and testosterone [RR: 0.61 ng/dL (95% CI: 0.44, 0.78 ng/dL); RR: 0.01 ng/dL (95% CI: 0.001, 0.01 ng/dL), respectively]. Ascorbic acid was associated with higher progesterone (RR: 0.15 ng/mL; 95% CI: 0.05, 0.25 ng/mL) and with lower follicle-stimulating hormone (RR: -0.06 mIU/mL; 95% CI: -0.09, -0.03 mIU/mL). The ratio of α- to γ-tocopherol was associated with an increased risk of anovulation (RR: 1.03; 95% CI: 1.01, 1.06). Conclusions: These findings shed new light on the intricate associations between serum antioxidants and endogenous hormones in healthy premenopausal women and support the hypothesis that concentrations of serum vitamins affect steroidogenesis even after adjustment for oxidative stress.

Original languageEnglish (US)
Pages (from-to)98-106
Number of pages9
JournalJournal of Nutrition
Volume146
Issue number1
DOIs
StatePublished - 2016
Externally publishedYes

Keywords

  • Antioxidants
  • Estrogen
  • Ovulation
  • Progesterone
  • Vitamins

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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