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Introduction
The majority of peptides that have been discussed up until this point have originated in the pituitary, gut, or connective tissue. MOTS-c is different. MOTS-c originates from your mitochondria, which are tiny organelles found in nearly every cell in your body that are responsible for creating energy. For years, mitochondria were thought of purely as the “powerhouse of the cell,” quietly converting nutrients into ATP. Later, it was discovered that mitochondrial DNA encodes its own small biologically active peptides that are released from the mitochondria and act as hormone-like signaling molecules throughout the body. MOTS-c is the most studied of these peptides.
Ever since MOTS-c was discovered back in 2015, it has created quite the buzz in the realms of metabolic health, exercise physiology, and longevity science due to its potential to affect the body’s glucose metabolism, stress response, and cellular aging. In this blog, we will cover what MOTS-c is, how it works, what benefits science currently backs, common dosing practices, and its safety profile.
What is MOTS-c?
MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA- c) is a small peptide comprised of 16 amino acids, which is encoded by DNA not in the nucleus, but inside the mitochondrial genome, specifically inside the gene that encodes the mitochondrial 12S ribosomal RNA. MOTS-c is one of the several “mitochondrial-derived peptides,” including humanin and the SHLP family of peptides.
Once synthesized, MOTS-c is actively transported out of the mitochondria and into the nucleus during conditions like exercise or metabolic stress. From there, it can enter the bloodstream, where it seems to function as a signal conveying information about the energetic state of the cell to other tissues. In fact, circulating MOTS-c levels are shown to increase with exercise and, much like GHK-Cu and other endogenous peptides, natural levels of MOTS-c tend to decrease with age, and for this reason it has gained interest in the field of aging research.
How MOTS-c Works: The Mechanism
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Activating AMPK
The most well-known mechanism of MOTS-c is activation of AMP-activated protein kinase (AMPK). AMPK has been called the master metabolic switch of the cell. AMPK activation is the same pathway triggered by exercise, caloric restriction, and drugs like metformin. AMPK activation causes cells to utilize their stored fuel more efficiently, improving insulin sensitivity and glucose uptake into muscles.
Regulating Glucose Metabolism
MOTS-c has been shown to increase insulin-independent glucose uptake into skeletal muscle. Along with many other traits, this unique capability of MOTS-c has piqued researchers’ interest in developing this peptide as a possible therapy for insulin resistance and metabolic syndrome. In addition, MOTS-c has also been found to improve glucose tolerance and reverse diet- and age-related insulin resistance in animal models.
Mimicking the Effects of Exercise
Since MOTS-c activates many of the same downstream pathways triggered by physical activity, including AMPK signaling, increasing mitochondrial efficiency, and improving fatty acid oxidation, MOTS-c has also been called an “exercise mimetic” in scientific literature. In animal studies, MOTS-c administration has been found to increase exercise capacity and improve metabolic parameters independent of activity levels; however, this does not necessarily mean exercise can be replaced by MOTS-c supplementation.
Retrograde Mitochondrial-Nuclear Signaling
One interesting feature of MOTS-c biology is that MOTS-c seems to travel to the nucleus of cells under conditions of stress and alter the expression of nuclear genes that control antioxidant defences as well as metabolic programs. This process of “retrograde signaling” or mitochondria talking to the nucleus is a newly recognized aspect of cell biology, and MOTS-c is one of the best examples we know of.
Cellular Stress Resistance
In preclinical models, MOTS-c has also been shown to help cells tolerate metabolic and oxidative stress, which is part of the basis for interest in its potential role in aging and age-related disease.
Since MOTS c works at the level of cellular energy production, you may also enjoy reading our blog on Epitalon, another longevity focused peptide that supports healthy aging through telomere maintenance and cellular renewal.
Benefits of MOTS-c Peptide
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Based on current scientific literature, the areas where MOTS-c shows the most promising effects include:
- Improved insulin sensitivity and glucose metabolism: Multiple animal studies have demonstrated improvements in glucose tolerance and insulin sensitivity with MOTS-c treatment
- Metabolic health and weight management: By activating AMPK and enhancing fat oxidation, MOTS-c may help achieve/maintain healthier body composition, particularly in the context of diet-induced or age-related metabolic decline
- Exercise capacity and endurance: MOTS-c has been shown to improve exercise capacity in animal studies, possibly due to mitochondrial efficiency as well as enhanced muscle metabolism
- Healthy aging: MOTS-c is one of the well-studied peptides when it comes to longevity. As a peptide that declines with age and intersects with many well-established longevity pathways, it stands to have significant effects on age-related decline
- Cardiometabolic health: Research suggests improvements in several markers associated with metabolic syndrome, but more studies are required regarding cardiovascular outcomes in humans.
If you’re interested in peptides that support immune resilience alongside healthy aging, explore our detailed guide on Thymosin Alpha 1 and how immune health influences long term wellness.
It is to be noted that the best data for MOTS-c to date comes from cell and animal studies. Clinical trial data in humans is just beginning to emerge. So, while the mechanism is persuasive, it is not quite at the level of, say, well-known medications that affect metabolism.
How is MOTS-c Peptide Administered?
Subcutaneous injection is by far the most common route of administration for MOTS-c. Injection sites include the abdomen and thigh. MOTS-c is often provided as a lyophilized powder that must be reconstituted with bacteriostatic water using sterile technique before use.
Safety Considerations and Side Effects
The safety of MOTS-c peptide appears to be favourable based on available research; however, there are important caveats:
- Injection-site reactions: As with any injectable peptide, mild redness, swelling, or irritation at the injection site appear to be the most commonly reported side effects.
- Impact on blood sugar levels: MOTS-c has been shown to influence glucose metabolism. People taking diabetes medications should be cautious, as the combined effects of both MOTS-c supplementation and diabetes medications on blood sugar have not been studied extensively in humans.
- Pregnancy and breast-feeding: As there is no established safety data for MOTS-c use during pregnancy or breast-feeding, it should be avoided.
Peptides are only one piece of the puzzle. Before considering any longevity focused intervention, it’s important to understand your current metabolic health, inflammation, nutrient status, and biological drivers. Book your Root Cause Analysis with iThrive to build a personalised health roadmap based on your body’s needs.
Key Takeaway
MOTS-c is a mitochondrial-derived peptide, which is a small molecule encoded by the mitochondrial DNA responsible for energy production in cells. It is unique because it can pass through the mitochondria and enter the nucleus of the cell, where it activates signals that promote normal metabolic homeostasis of glucose and lipid metabolism. For this reason, MOTS-c is thought of as an exercise mimetic and has been linked to metabolic improvements and increased insulin sensitivity. MOTS-c has also garnered attention for possible benefits related to aging. Mitochondrial function naturally declines with age, and it is directly linked to reduced energy, slower metabolism, and increased susceptibility to age-related diseases. MOTS-c helps with mitochondrial signaling, and it represents a promising piece of the puzzle for those interested in the science of healthy aging and longevity.
References
1. Lee, C., Zeng, J., Drew, B. G., Sallam, T., Martin-Montalvo, A., Wan, J., Kim, S. J., Mehta, H., Hevener, A. L., de Cabo, R., & Cohen, P. (2015). The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell metabolism, 21(3), 443–454. https://doi.org/10.1016/j.cmet.2015.02.009
2. Reynolds, J. C., Lai, R. W., Woodhead, J. S. T., Joly, J. H., Mitchell, C. J., Cameron-Smith, D., Lu, R., Cohen, P., Graham, N. A., Benayoun, B. A., Merry, T. L., & Lee, C. (2021). MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nature communications, 12(1), 470. https://doi.org/10.1038/s41467-020-20790-0
3. Kim, K. H., Son, J. M., Benayoun, B. A., & Lee, C. (2018). The Mitochondrial-Encoded Peptide MOTS-c Translocates to the Nucleus to Regulate Nuclear Gene Expression in Response to Metabolic Stress. Cell metabolism, 28(3), 516–524.e7. https://doi.org/10.1016/j.cmet.2018.06.008
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