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Hypogonadotrophic hypogonadism in type 2 diabetes
P Dandona1, S Dhindsa, A Chaudhuri
1Division of Endocrinology, Diabetes and Metabolism, State University of New York at Buffalo and Kaleida Health, Buffalo, New York, USA. pdandona@kaleidahealth.org
Summary
Hypogonadotrophic hypogonadism (HH), characterized by low testosterone, is common in type 2 diabetes, linked to inflammation and obesity. Insulin resistance in GnRH neurons may cause HH, potentially impacting cardiovascular risk.
Area of Science:
- Endocrinology
- Metabolic Syndrome
- Reproductive Health
Background:
- Type 2 diabetes is frequently associated with hypogonadotrophic hypogonadism (HH), a condition marked by low testosterone, luteinizing hormone (LH), and follicle stimulating hormone (FSH).
- Obesity is a significant factor in HH among type 2 diabetes patients, though diabetes duration or HbA1c levels are not correlated.
- HH is not observed in type 1 diabetes, suggesting a specific link to type 2 diabetes pathophysiology.
Purpose of the Study:
- To explore the relationship between inflammation, insulin resistance, and HH in type 2 diabetes.
- To investigate the potential role of insulin resistance in GnRH-secreting neurons as a cause of HH.
- To discuss the clinical relevance of HH and its association with adiposity and cardiovascular events.
Main Methods:
- Review of recent scientific literature and data.
- Analysis of correlations between C-reactive protein, testosterone levels, and HH.
- Examination of experimental data from mouse models and neuronal cell cultures.
Main Results:
- Elevated C-reactive protein levels in HH patients are inversely related to testosterone concentrations, suggesting inflammation's role.
- Insulin resistance in the brain's GnRH-secreting neurons is proposed as a mechanism for HH.
- Low testosterone levels are linked to increased adiposity and cardiovascular events.
Conclusions:
- Inflammation and insulin resistance, particularly in GnRH neurons, are implicated in the pathogenesis of HH in type 2 diabetes.
- Further clinical trials are needed to assess testosterone replacement therapy's efficacy in improving insulin resistance, inflammation, and cardiovascular risk.
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