11-Oxygenated Androgens Inhibit Brown Adipose Tissue Differentiation

Area of Science:

• Endocrinology
• Metabolic Research
• Cell Biology

Background:

• Polycystic ovary syndrome (PCOS) is linked to reduced brown adipose tissue (BAT) activity and elevated 11-oxygenated androgens.
• The impact of these specific androgens on BAT metabolism remains largely unexplored.

Purpose of the Study:

• To investigate the effects of 11-ketotestosterone (KT) and 11-ketodihydrotestosterone (KDHT) on brown adipose tissue (BAT) metabolism.
• To determine if these androgens influence brown adipocyte differentiation and gene expression.

Main Methods:

• In vitro studies using mouse brown adipocyte cell line (T37i) treated with various androgens during or after differentiation.
• In vivo studies involving daily injections of androgens (DHT, KT, KDHT) into female mice for 1 day or 1 week.
• RNA sequencing (RNAseq) and Gene Set Enrichment Analysis (GSEA) of collected adipose tissue.

Main Results:

• Androgens, including KT and KDHT, dose-dependently inhibited adipogenic marker expression and lipid accumulation in differentiating brown adipocytes.
• In vivo, 11-oxygenated androgens (KT, KDHT) and DHT altered the BAT transcriptome, with DHT and KT acutely downregulating metabolic pathways.
• KDHT showed a weaker inhibitory effect compared to KT on adipocyte differentiation and metabolic gene expression.

Conclusions:

• High concentrations of 11-oxygenated androgens directly inhibit brown adipocyte differentiation in vitro.
• KT acutely downregulates the BAT metabolic transcriptome in vivo, suggesting a direct impact on BAT function.
• Elevated 11-oxygenated androgens may contribute to metabolic complications in hyperandrogenic conditions like PCOS by impairing BAT function.