TESTOSTERONE AND INSULIN RESISTANCE IN MEN: EVIDENCE FOR A COMPLEX BI-DIRECTIONAL RELATIONSHIP

Area of Science:

• Endocrinology
• Metabolic Syndrome
• Male Reproductive Health

Background:

• Low testosterone levels are associated with type 2 diabetes mellitus (T2DM) in men.
• Understanding the intricate relationship between testosterone and insulin sensitivity is crucial for metabolic health management.

Purpose of the Study:

• To investigate the association between serum testosterone levels and insulin sensitivity in men.
• To elucidate the mechanisms linking hypogonadism, mitochondrial dysfunction, and insulin resistance.

Main Methods:

• Correlation analysis of serum testosterone and insulin sensitivity across glucose tolerance spectrum.
• Investigation of the hypothalamic-pituitary-gonadal axis in hypogonadal men.
• Functional and genetic studies to explore mechanisms of insulin resistance in hypogonadism.

Main Results:

• A positive correlation was observed between testosterone levels and insulin sensitivity in men.
• Hypogonadal men exhibited twofold higher insulin resistance compared to eugonadal controls.
• Weight loss improved testosterone levels and reversed hypogonadism in over 50% of obese men with impaired glucose tolerance.

Conclusions:

• The relationship between testosterone and insulin resistance in men is bidirectional.
• Hypogonadism may induce insulin resistance via mitochondrial dysfunction.
• Lifestyle modification, particularly weight loss, is vital for managing hypogonadal males.