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Obesity (Silver Spring). 2018 Dec;26(12):1898-1904. doi: 10.1002/oby.22324.

Hypothalamic Gliosis by MRI and Visceral Fat Mass Negatively Correlate with Plasma Testosterone Concentrations in Healthy Men.

Author information

1
Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington, Seattle, Washington, USA.
2
Division of General Internal Medicine, Department of Medicine, University of Washington, Seattle, Washington, USA.
3
Department of Epidemiology, University of Washington, Seattle, Washington, USA.
4
Geriatric Research, Education and Clinical Center, VA Puget Sound Health Care System, Seattle, Washington, USA.
5
Division of Gerontology & Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington, USA.

Abstract

OBJECTIVE:

This study aimed to determine whether a relationship was evident between gliosis in the mediobasal hypothalamus (MBH) and plasma testosterone concentrations in men.

METHODS:

A total of 41 adult men (aged 18-50 years) from 23 twin pairs underwent fasting morning blood draw and brain magnetic resonance imaging. T2 relaxation time was used to quantify gliosis in the MBH and control areas in the putamen and amygdala. Plasma concentrations of testosterone and 17β-estradiol were measured by liquid chromatography-tandem mass spectrometry. Body composition including visceral adiposity was measured by dual x-ray absorptiometry.

RESULTS:

A negative association was found between MBH T2 relaxation time and plasma concentrations of both free and total testosterone (r = -0.29, P < 0.05 and r = -0.37, P < 0.01, respectively). Visceral adiposity exhibited a negative correlation with plasma total testosterone concentration (r = -0.45, P = 0.001) but a positive correlation with MBH T2 relaxation time (r = 0.24, P = 0.03). The negative correlation between plasma total testosterone and MBH T2 relaxation time remained significant after adjustment for visceral adiposity, age, BMI, and insulin resistance.

CONCLUSIONS:

In healthy men across a range of BMIs, MBH gliosis was associated with higher visceral adiposity but lower endogenous testosterone. These findings suggest that MBH gliosis could provide novel mechanistic insights into gonadal dysfunction in men with obesity.

PMID:
30460775
PMCID:
PMC6251490
DOI:
10.1002/oby.22324
[Indexed for MEDLINE]
Free PMC Article

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