A 16-week exercise program increased levels of the mitochondrial peptide MOTS-c in non-Hispanic White breast cancer survivors, with higher MOTS-c linked to reduced body fat, insulin resistance, and inflammation.
p < 0.01Post-exercise MOTS-c levels were significantly associated with reduced fat mass, body weight, insulin resistance, and inflammation in non-Hispanic White breast cancer survivors
What the researchers found
A 16-week aerobic and resistance exercise intervention significantly increased MOTS-c levels in non-Hispanic White breast cancer survivors, with post-exercise MOTS-c associated with reductions in fat mass, body weight, HOMA-IR, and CRP, and increased lean mass (p < 0.01).
Why it matters
This connects the benefits of exercise to a specific mitochondrial peptide, suggesting MOTS-c may partly explain how exercise protects cancer survivors from metabolic complications. Ethnic differences in response highlight the need for personalized approaches.
The numbers in context
25 Hispanic + 24 non-Hispanic White BCS; 16-week intervention; p < 0.01 for MOTS-c associations with fat mass, body weight, HOMA-IR, CRP, lean mass
How the study worked
Randomized controlled trial (secondary analysis). Stage I-III breast cancer survivors randomized to 16-week aerobic plus resistance exercise or standard care. Fasting plasma MOTS-c measured by in-house ELISA. Statistical analysis via paired t-test and repeated measures ANOVA.
Who was studied
Stage I-III Hispanic and non-Hispanic White breast cancer survivors
What this study cannot tell us
Secondary analysis with small sample size (49 total). MOTS-c response differed by ethnicity, possibly confounded by baseline metabolic differences. In-house ELISA used for MOTS-c measurement may limit reproducibility. Exercise intervention effects cannot be isolated to MOTS-c alone.
How to read the evidence
Moderate evidence: randomized controlled trial design but small sample size (49), secondary analysis, and in-house assay methodology.
When this study was published
Published in 2021. MOTS-c research has expanded significantly since, with growing interest in mitochondrial-derived peptides and exercise mimetics.
The bigger picture
MOTS-c is emerging as an important exercise-responsive mitochondrial peptide. Understanding how it mediates exercise benefits could lead to peptide-based therapies for patients who cannot exercise, and ethnic differences in MOTS-c response have implications for precision medicine.
Questions still open
- Could MOTS-c supplementation replicate exercise benefits for cancer survivors who cannot exercise?
- What specific mitochondrial DNA variations explain the different MOTS-c response between ethnic groups?
- Does the exercise-induced MOTS-c increase persist after the exercise program ends?
Common questions
What is MOTS-c?
Why did Hispanic and non-Hispanic White survivors respond differently?
Read the original research
Effect of aerobic and resistance exercise on the mitochondrial peptide MOTS-c in Hispanic and Non-Hispanic White breast cancer survivors.
Scientific reports, 11(1), 16916
Citation
Dieli-Conwright, Christina M; Sami, Nathalie; Norris, Mary K; Wan, Junxiang; Kumagai, Hiroshi; Kim, Su-Jeong; Cohen, Pinchas. (2021). Effect of aerobic and resistance exercise on the mitochondrial peptide MOTS-c in Hispanic and Non-Hispanic White breast cancer survivors.. Scientific reports, 11(1), 16916. https://doi.org/10.1038/s41598-021-96419-z