Medicine (Austin & Northern Health) - Research Publications

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Start date: 2013 × End date: 2014 × Author: Grossmann, Mathis × Author: DUPUIS, PHILIPPE ×

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    Effect of Testosterone Treatment on Glucose Metabolism in Men With Type 2 Diabetes: A Randomized Controlled Trial
    Gianatti, EJ ; Dupuis, P ; Hoermann, R ; Strauss, BJ ; Wentworth, JM ; Zajac, JD ; Grossmann, M (AMER DIABETES ASSOC, 2014-08)
    OBJECTIVE: To determine whether testosterone therapy improves glucose metabolism in men with type 2 diabetes (T2D) and lowered testosterone. RESEARCH DESIGN AND METHODS: We conducted a randomized, double-blind, parallel, placebo-controlled trial in 88 men with T2D, aged 35-70 years with an HbA1c ≤8.5% (69 mmol/mol), and a total testosterone level, measured by immunoassay, of ≤12.0 nmol/L (346 ng/dL). Participants were randomly assigned to 40 weeks of intramuscular testosterone undecanoate (n = 45) or matching placebo (n = 43). All study subjects were included in the primary analysis. Seven men assigned to testosterone and six men receiving placebo did not complete the study. Main outcome measures were insulin resistance by homeostatic model assessment (HOMA-IR, primary outcome) and glycemic control by HbA1c (secondary outcome). RESULTS: Testosterone therapy did not improve insulin resistance (mean adjusted difference [MAD] for HOMA-IR compared with placebo -0.08 [95% CI -0.31 to 0.47; P = 0.23]) or glycemic control (MAD HbA1c 0.36% [0.0-0.7]; P = 0.05), despite a decrease in fat mass (MAD -2.38 kg [-3.10 to -1.66]; P < 0.001) and an increase in lean mass (MAD 2.08 kg [1.52-2.64]; P < 0.001). Testosterone therapy reduced subcutaneous (MAD -320 cm(3) [-477 to -163]; P < 0.001) but not visceral abdominal adipose tissue (MAD 140 cm(3) [-89 to 369]; P = 0.90). CONCLUSIONS: Testosterone therapy does not improve glucose metabolism or visceral adiposity in obese men with moderately controlled T2D and modest reductions in circulating testosterone levels typical for men with T2D.
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    Effect of Testosterone Treatment on Constitutional and Sexual Symptoms in Men With Type 2 Diabetes in a Randomized, Placebo-Controlled Clinical Trial
    Gianatti, EJ ; Dupuis, P ; Hoermann, R ; Zajac, JD ; Grossmann, M (ENDOCRINE SOC, 2014-10)
    OBJECTIVE: The objective of the study was to assess the effect of T treatment on constitutional and sexual symptoms in men with type 2 diabetes (T2D). DESIGN: This was a randomized double-blind, parallel, placebo-controlled trial. SETTING: The study was conducted at a tertiary referral center. PATIENTS: Men aged 35-70 years with T2D, a hemoglobin A1c less than 8.5%, and a total T level less than 12.0 nmol/L (346 ng/dL) with mild to moderate aging male symptoms and erectile dysfunction. INTERVENTION: Eighty-eight participants were randomly assigned to 40 weeks of im T undecanoate (n = 45) or matching placebo (n = 43). MAIN OUTCOME MEASURES: Constitutional symptoms using the aging male symptoms (AMS) score, sexual desire (question 17 AMS score), and erectile function (International Index of Erectile Function-5). RESULTS: T treatment did not substantially improve aging male symptoms [mean adjusted difference (MAD) in change over 40 weeks across the T and placebo groups in AMS total score, -0.9 (95% confidence interval [CI] -4.1, 2.2), P = .67] or sexual desire [MAD in question 17 AMS, -0.3 (95% CI -0.8, 0.2), P = .17]. Although compared with placebo, erectile function in men assigned to T was reduced [MAD in International Index of Erectile Function abridged version 5, -2.0 (95% CI -3.4, -0.6), P < .02], there was no significant difference between baseline and 40-week International Index of Erectile Function abridged version 5 scores if both groups were analyzed separately. At baseline, symptoms were worse in men with depression and microvascular complications but did not correlate with T levels. CONCLUSIONS: In this trial, T treatment did not substantially improve constitutional or sexual symptoms in obese, aging men with T2D with mild to moderate symptoms and modest reduction in T levels typical for the vast majority of such men.
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    Lowered testosterone in male obesity: mechanisms, morbidity and management
    Fui, MNT ; Dupuis, P ; Grossmann, M (WOLTERS KLUWER MEDKNOW PUBLICATIONS, 2014-03)
    With increasing modernization and urbanization of Asia, much of the future focus of the obesity epidemic will be in the Asian region. Low testosterone levels are frequently encountered in obese men who do not otherwise have a recognizable hypothalamic-pituitary-testicular (HPT) axis pathology. Moderate obesity predominantly decreases total testosterone due to insulin resistance-associated reductions in sex hormone binding globulin. More severe obesity is additionally associated with reductions in free testosterone levels due to suppression of the HPT axis. Low testosterone by itself leads to increasing adiposity, creating a self-perpetuating cycle of metabolic complications. Obesity-associated hypotestosteronemia is a functional, non-permanent state, which can be reversible, but this requires substantial weight loss. While testosterone treatment can lead to moderate reductions in fat mass, obesity by itself, in the absence of symptomatic androgen defi ciency, is not an established indication for testosterone therapy. Testosterone therapy may lead to a worsening of untreated sleep apnea and compromise fertility. Whether testosterone therapy augments diet- and exercise-induced weight loss requires evaluation in adequately designed randomized controlled clinical trials.