MOTS-c Peptide Primes Adrenal Gland Metabolism Without Boosting Steroid Hormones

The adrenal cortex is a vital endocrine gland responsible for producing a wide array of steroid hormones, including cortisol and aldosterone, which regulate stress, metabolism, and blood pressure. Mitochondrial open reading frame of the 12S rRNA type-c (MOTS-c) is a recently discovered mitochondrial-derived peptide known to influence metabolic pathways in various tissues. However, its specific role and impact on adrenal cortex function have remained largely unexplored. This study aimed to elucidate how MOTS-c influences adrenal cortex metabolism and steroidogenesis.

The study revealed that MOTS-c significantly enhanced metabolic activity within the adrenal cortex. In vitro, MOTS-c treatment at 100 nM led to a 35% increase in mitochondrial oxygen consumption rate and a 28% boost in ATP production compared to controls (p<0.01). Gene expression analysis showed a 2.1-fold upregulation of PGC-1α (a master regulator of mitochondrial biogenesis) and a 1.8-fold increase in SIRT1 (a metabolic sensor) in adrenal cells treated with MOTS-c (p<0.05). However, despite these metabolic changes, the production of major steroid hormones, including cortisol, aldosterone, and DHEA, remained statistically unchanged, showing no significant difference between the MOTS-c-treated and control groups (p>0.05). This suggests a distinct metabolic priming effect. > The most important finding was that MOTS-c significantly increased adrenal metabolic activity by 35% without altering the output of steroid hormones, indicating a unique regulatory mechanism.