The Role of MOTS-c in Vascular Calcification and Restoration of Insulin Sensitivity

by Dr. James Ross

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MOTS-c Activates AMPK to Regulate Metabolism and Prevent Vascular Calcification

Recent research has identified MOTS-c as a mitochondrial-derived bioactive peptide with significant regulatory functions. Studies indicate that MOTS-c activates the AMPK signaling pathway, promoting both metabolic balance and vascular health. In particular, MOTS-c has been shown to inhibit vascular calcification (VC) by stimulating AMPK activity and suppressing the expression of angiotensin II type 1 (AT-1) and endothelin B (ET-B) receptors.

AT-1 and ET-B receptors are closely linked to cardiovascular pathology through their involvement in AMPK regulation. Elevated AT-1 receptor activity contributes to oxidative stress, myocardial fibrosis, and contractile dysfunction, while reducing AT-1 receptor expression alleviates these harmful processes. In diabetic kidney disease, AT-1 receptor activation interferes with AMPK signaling, worsening proteinuria. Treatments such as metformin restore AMPK activity while downregulating AT-1 levels in renal tissue. Similarly, overexpression of ET-1 contributes to hypertension, vascular injury, and renal impairment, while decreased ET-1 receptor activation improves cardiac remodeling. Interestingly, in vascular smooth muscle cells under hyperglycemic conditions, AMPK activation can upregulate ET-B receptors to reduce excessive autophagy.

Previous findings further suggest that MOTS-c enhances glucose uptake, regulates nuclear gene expression through AMPK, and disrupts folate metabolism and purine biosynthesis under metabolic stress. In experimental models, MOTS-c administration improved vascular wall integrity by reducing disorganized elastic fibers and limiting calcium phosphate deposition in calcified aortas. These protective effects occurred by reversing AMPK suppression induced by Vitamin D3 and Nicotine (VDN) exposure. Additionally, in pulmonary hypertension models, AMPK activation via agents such as liraglutide improved ventricular pressure and reduced right ventricular hypertrophy, underscoring the importance of this pathway.

MOTS-c Improves Vascular Relaxation in Calcified Arteries

At a dosage of 5 mg/kg, MOTS-c demonstrated significant vasodilatory effects in calcified vasculature. Echocardiographic assessments confirmed improved vascular compliance and reduced vascular tension in treated groups compared to controls. In models of VDN-induced vascular calcification, systolic and diastolic blood pressure levels declined notably with MOTS-c treatment, dropping from approximately 126/95 mmHg to 108/78 mmHg. These results suggest that MOTS-c can directly enhance vascular relaxation while simultaneously counteracting calcification.

Insulin Receptor Resensitization

To investigate MOTS-c’s impact on insulin responsiveness, hyperinsulinemic-euglycemic clamp studies were performed. Short-term administration of MOTS-c (7 days) improved systemic insulin sensitivity by approximately 30%, as indicated by the increased glucose infusion rate required to maintain normal blood sugar under insulin stimulation. Importantly, these improvements occurred independently of body weight changes.

Although MOTS-c did not alter weight in animals fed a standard diet, it effectively prevented obesity in high-fat diet (HFD) models. MOTS-c treatment also suppressed HFD-induced hyperinsulinemia, reflecting improved insulin action and glucose balance. Moreover, treated mice showed marked reductions in hepatic fat accumulation, indicating a protective role against diet-induced steatosis.

REFERENCES

1.The Mitochondrial-Derived Peptide MOTS-c Promotes Metabolic Homeostasis and Reduces Obesity and Insulin Resistance

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