title: Dose-dependent effects of testosterone on regional adipose tissue distribution in healthy young men.
abstract: Testosterone supplementation reduces total body adipose tissue (AT), but we do not know whether the effects are uniformly distributed throughout the body or are region specific, or whether they are dose related. We determined the effects of graded doses of testosterone on regional AT distribution in 54 healthy men (18-35 yr) in a 20-wk, randomized, double-blind study of combined treatment with GnRH agonist plus one of five doses (25, 50, 125, 300, or 600 mg/wk) of testosterone enanthate (TE). Total body, appendicular, and trunk AT and lean body mass were measured by dual-energy x-ray absorptiometry, and sc, intermuscular, and intraabdominal AT of the thigh and abdomen were measured by magnetic resonance imaging. Treatment regimens resulted in serum nadir testosterone concentrations ranging from subphysiological to supraphysiological levels. Dose-dependent changes in AT mass were negatively correlated with TE dose at all sites and were equally distributed between the trunk and appendices. The lowest dose was associated with gains in sc, intermuscular, and intraabdominal AT, with the greatest percent increase occurring in the sc stores. At the three highest TE doses, thigh intermuscular AT volume was significantly reduced, with a greater percent loss in intermuscular than sc depots, whereas intraabdominal AT stores remained unchanged. In conclusion, changes in testosterone concentrations in young men are associated with dose-dependent and region-specific changes in AT and lean body mass in the appendices and trunk. Lowering testosterone concentrations below baseline increases sc and deep AT stores in the appendices and abdomen, with a greater percent increase in sc depots. Conversely, elevating testosterone concentrations above baseline induces a greater loss of AT from the smaller, deeper intermuscular stores of the thigh.
authors.affiliation: Division of Endocrinology, Metabolism, and Molecular Medicine, Charles R. Drew University of Medicine and Science, Los Angeles, California 90059, USA. woodhou@mcmaster.ca
authors.forename: Linda J
authors.initials: LJ
authors.lastname: Woodhouse
authors.forename: Nidhi
authors.initials: N
authors.lastname: Gupta
authors.forename: Meenakshi
authors.initials: M
authors.lastname: Bhasin
authors.forename: Atam B
authors.initials: AB
authors.lastname: Singh
authors.forename: Robert
authors.initials: R
authors.lastname: Ross
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Phillips
authors.forename: Shalender
authors.initials: S
authors.lastname: Bhasin
mesh_terms: D000005:Abdomen; D015502:Absorptiometry, Photon; D000273:Adipose Tissue / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000187:drug effects*; D000328:Adult; D001823:Body Composition / Q000187:drug effects*; D001835:Body Weight / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D005121:Extremities; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D018482:Muscle, Skeletal; D009929:Organ Size / Q000187:drug effects; D012016:Reference Values; D013739:Testosterone / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D013848:Thigh
chemical_list: D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; C004648:testosterone enanthate