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Dose‐response effects of sex hormone concentrations on body composition and adipokines in medically castrated healthy men administered graded doses of testosterone gel
Author(s) -
Thirumalai Arthi,
Rubinow Katya B.,
Cooper Lori A.,
Amory John K.,
Marck Brett T.,
Matsumoto Alvin M.,
Page Stephanie T.
Publication year - 2017
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/cen.13342
Subject(s) - endocrinology , medicine , testosterone (patch) , lean body mass , adipokine , dihydrotestosterone , adiponectin , leptin , adipose tissue , sex hormone binding globulin , insulin , hormone , insulin resistance , androgen , obesity , body weight
Summary Objective Serum sex steroid concentrations may alter body composition and glucose homoeostasis in men in a dose‐response manner. We evaluated these end‐points in healthy men rendered medically castrate through use of a gonadotrophin‐releasing hormone antagonist (acyline) with incremental doses of exogenous testosterone (T) gel. Design Subjects (n=6‐9 per group) were randomly assigned to injections of acyline every 2 weeks plus transdermal T gel (1.25 g, 2.5 g, 5.0 g, 10 g or 15 g) daily or double placebo (injections and gel) for 12 weeks. Patients Healthy men, ages 25‐55 years, with normal serum total T concentrations. Measurements Serum T, dihydrotestosterone ( DHT ) and oestradiol (E2) were measured at baseline and every 2 weeks. Body composition was analysed by dual‐energy X‐ray absorptiometry at baseline and week 12. Fasting serum adiponectin, leptin, glucose and insulin concentrations were measured at baseline and week 10. Results Forty‐eight men completed the study. A significant treatment effect was observed for change in lean mass ( ANOVA P =.01) but not fat mass ( P =.14). Lean mass increased in the 15 g T group relative to all lower dose groups, except the 10 g T group. When all subjects were analysed together, changes in lean mass correlated directly and changes in fat mass correlated inversely with serum T, E2 and DHT . No changes were noted in serum glucose, insulin or adipokine levels. Conclusions In healthy men, higher serum concentrations of T, DHT and E2 were associated with greater increases in lean mass and decreases in fat mass but not with changes in serum glucose, insulin or adipokines.