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Causal relationship between obesity and serum testosterone status in men: A bi-directional mendelian randomization analysis

Journal article
Authors Joel Eriksson
R. Haring
N. Grarup
Liesbeth Vandenput
H. Wallaschofski
Erik Lorentzen
T. Hansen
Dan Mellström
O. Pedersen
M. Nauck
Mattias Lorentzon
L. L. N. Husemoen
H. Volzke
M. Karlsson
S. E. Baumeister
A. Linneberg
Claes Ohlsson
Published in PLoS ONE
Volume 12
Issue 4
ISSN 1932-6203
Publication year 2017
Published at Core Facilities, Bioinformatics
Centre for Bone and Arthritis Research
Institute of Medicine, Department of Internal Medicine and Clinical Nutrition
Language en
Links doi.org/10.1371/journal.pone.017627...
Keywords hormone-binding globulin, body-mass index, genome-wide association, elderly-men, older men, fto gene, hypogonadotropic hypogonadism, metabolic syndrome, muscle strength, risk-factors, Science & Technology - Other Topics
Subject categories Clinical Medicine

Abstract

Context Obesity in men is associated with low serum testosterone and both are associated with several diseases and increased mortality. Examine the direction and causality of the relationship between body mass index (BMI) and serum testosterone. Bi-directional Mendelian randomization (MR) analysis on prospective cohorts. Five cohorts from Denmark, Germany and Sweden (Inter99, SHIP, SHIP Trend, GOOD and MrOS Sweden). 7446 Caucasian men, genotyped for 97 BMI-associated SNPs and three testosterone-associated SNPs. BMI and serum testosterone adjusted for age, smoking, time of blood sampling and site. 1 SD genetically instrumented increase in BMI was associated with a 0.25 SD decrease in serum testosterone (IV ratio: -0.25, 95% CI: -0.42-0.09, p = 2.8*10(-3)). For a body weight reduction altering the BMI from 30 to 25 kg/m(2), the effect would equal a 13% increase in serum testosterone. No association was seen for genetically instrumented testosterone with BMI, a finding that was confirmed using large-scale data from the GIANT consortium (n = 104349). Our results suggest that there is a causal effect of BMI on serum testosterone in men. Population level interventions to reduce BMI are expected to increase serum testosterone in men.

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