Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/117235
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Type: Journal article
Title: Age-related changes in estradiol and longitudinal associations with fat mass in men
Author: Wu, A.
Shi, Z.
Martin, S.
Vincent, A.
Heilbronn, L.
Wittert, G.
Citation: PLoS ONE, 2018; 13(8):e0201912-1-e0201912-14
Publisher: Public Library of Science (PLoS)
Issue Date: 2018
ISSN: 1932-6203
1932-6203
Statement of
Responsibility: 
Albert Wu, Zumin Shi, Sean Martin, Andrew Vincent, Leonie Heilbronn, Gary Wittert
Abstract: Context: In men, circulating 17β-estradiol originates primarily from peripheral aromatization of testosterone particularly in adipose tissue. The effect of ageing and obesity on circulating estradiol remains unclear. Objective: Determine five-year changes in serum estradiol and the association with testosterone and fat mass in Australian men. Design: Longitudinal cohort study. At baseline and five-year follow-up, socio-demographic and health-related data including behaviors, chronic conditions, and medication use were collected by questionnaire. Estradiol and testosterone were assayed by liquid chromatography-tandem mass spectrometry and sex hormone-binding globulin by immunochemiluminescent assay. Fat mass was assessed by dual-energy X-ray absorptiometry. Participants: Community-dwelling men aged 35 years and older at enrollment, resident in the northern and western suburbs of Adelaide without established disease of, or medications affecting, the hypothalamus-pituitary-gonadal axis (n = 725). Main Outcome measures: The dependence of change in serum estradiol over five years on age, testosterone and fat mass after adjustment for multiple confounders. Results: At baseline, mean age was 53.0 ± 10.8 years. Mean serum estradiol levels at baseline and five-year follow-up were 94.9 ± 34.8 and 89.4 ± 30.4 pmol/L respectively (-1.1 pmol/L/year). On multivariable analyses, estradiol change was associated with changes in testosterone (B-estimate = 2.719, standard error = 0.369, p˂0.001), but not age or total fat mass. Change in testosterone/estradiol ratio was inversely associated with change in fat mass (B = -1.450, SE = 0.575, p = 0.012), and this was consistent across quartiles of fat mass change. Conclusions: In healthy men, circulating estradiol is primarily dependent on testosterone. With increasing fat mass, estradiol decreases less than testosterone. From a clinical standpoint these data indicate that obesity is associated with a change in the testosterone to estradiol ratio, but a change in estradiol does not occur unless some other pathology is present.
Keywords: Adipose Tissue; Humans; Testosterone; Estradiol; Aromatase; Risk Factors; Longitudinal Studies; Age Factors; Sex Factors; Gene Expression; Aging; Adult; Aged; Aged, 80 and over; Middle Aged; Australia; Male; Biomarkers
Rights: Copyright: © 2018 Wu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
RMID: 0030095477
DOI: 10.1371/journal.pone.0201912
Grant ID: http://purl.org/au-research/grants/nhmrc/627227
http://purl.org/au-research/grants/nhmrc/427639
Appears in Collections:Medicine publications

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