MOTS-c
MOTS-c is a mitochondrial-derived peptide (MDP), a 16-amino-acid peptide encoded by the 12S ribosomal RNA gene of mitochondrial DNA. It was identified as part of a newly recognized class of signaling molecules originating from mitochondria [1]. Research suggests MOTS-c acts as a signaling factor connecting mitochondrial function to cellular and systemic physiology, distinguishing it from nuclear-encoded peptides through its unique genomic origin.
Published investigations have examined MOTS-c's role in multiple biological processes spanning cellular metabolism, reproductive biology, and disease pathophysiology. Studies have reported associations between MOTS-c levels and exercise capacity, metabolic parameters, and cellular stress responses [2]. Research models have included cultured cells, animal studies, and human observational investigations exploring MOTS-c's mechanisms and functions. The accumulating literature demonstrates MOTS-c's importance in metabolic and cellular homeostasis.
What is the origin and discovery context of MOTS-c?
MOTS-c was discovered as part of an emerging class of mitochondrial-derived peptides that function as signaling molecules [1]. Researchers identified that these peptides are generated from mitochondrial DNA and can be released to exert effects on cellular and systemic processes. The discovery expanded understanding of mitochondrial biology beyond energy production to include endocrine-like signaling functions.
Mitochondrial dysfunction and aging have been central to MOTS-c research. Investigators reported that MOTS-c levels change with age and metabolic conditions, suggesting the peptide may track aspects of mitochondrial function [1]. These findings positioned MOTS-c within broader aging-related research paradigms.
What cellular mechanisms have researchers studied with MOTS-c?
Research has characterized MOTS-c's effects on mitochondrial bioenergetics and cellular metabolism with multiple molecular approaches. Studies reported that MOTS-c influences lipophagy—selective autophagy of lipid droplets—and tubular senescence in kidney cells through specific signaling pathways [3]. Investigators also reported MOTS-c's modulation of protein degradation pathways, specifically K33-linked deubiquitination of BACH1, in placental endothelial cells, demonstrating effects on protein post-translational modifications [4].
Cellular stress responses have been a central focus of MOTS-c investigations across multiple tissue contexts. Research documented MOTS-c's effects on apoptosis and oxidative stress markers in various cell types, including endothelial cells under pathological conditions [4]. A transcriptomic analysis nominated MOTS-c as a candidate modulator of fibrosis-associated macrophage populations, suggesting potential roles in immune and inflammatory processes [5]. These diverse mechanistic findings reflect MOTS-c's broad influence on cellular physiology.
Which physiological systems have researchers examined with MOTS-c?
Reproductive aging has been studied in relation to MOTS-c. A review summarised reports that measured bioenergetic markers in aging-associated granulosa cells and oocytes exposed to MOTS-c [1]. These studies examined how age-related changes in MOTS-c might affect reproductive cell function.
Metabolic disease models have been investigated with MOTS-c. Studies reported MOTS-c's effects in diabetic kidney disease, examining mechanisms of renal protection through lipophagy promotion and senescence suppression [3]. Vascular biology studies explored MOTS-c's role in endothelial cell function under pathological conditions [4].
What associations have been reported between MOTS-c and exercise?
Cross-sectional research documented associations between serum MOTS-c levels and exercise capacity in young adult males [2]. Researchers reported that MOTS-c correlated with aerobic fitness metrics and antioxidant markers, suggesting links between the peptide and exercise-responsive biology.
These associations positioned MOTS-c as a potential biomarker of physical conditioning and mitochondrial function in response to exercise [2]. The relationship between MOTS-c and exercise capacity suggests the peptide may reflect mitochondrial adaptations to physical training.
What pathological contexts have researchers studied MOTS-c in?
Kidney disease research has examined MOTS-c in models of diabetic nephropathy and associated metabolic dysfunction with focus on glomerular and tubular pathology [3]. Pregnancy-related pathologies have been investigated, including intrahepatic cholestasis of pregnancy, where MOTS-c modulation influenced vascular endothelial cell responses and apoptotic processes [4]. These clinical contexts represent areas of significant morbidity where MOTS-c effects on cellular function may have pathophysiological relevance.
Fibrosis-related conditions have been explored through integrative transcriptomic and computational approaches. Researchers computationally nominated MOTS-c as a candidate modulator of immune cell populations associated with radiation-induced proctitis, a challenging late complication of cancer treatment [5]. These diverse disease contexts reflect the range of pathological processes in which researchers have investigated MOTS-c involvement, spanning metabolic, vascular, immune, and tissue remodeling domains.
Frequently asked questions
How do mitochondrial-derived peptides like MOTS-c differ from other signaling peptides?
MOTS-c and other MDPs originate from mitochondrial DNA and represent a distinct class of endogenous signaling molecules [1]. Unlike most peptides synthesized through nuclear-encoded genes, MDPs provide a direct signaling link from mitochondria to cellular and systemic processes, a mechanism that distinguishes them mechanistically.
What do measured MOTS-c levels track in published studies?
Published research indicates MOTS-c levels associate with exercise capacity, antioxidant markers, and age-related changes in tissues like reproductive cells [2][1]. Researchers propose that MOTS-c may serve as a biomarker of mitochondrial function and metabolic state, though the relationship requires further investigation.
In which tissue types have researchers observed MOTS-c effects?
What research approaches are used to study MOTS-c mechanisms?
References
- Tsui KH, Cheng SH, Lin LT. The mitochondrial-derived peptide MOTS-c improves bioenergetics in aging-associated granulosa cells and oocytes. 2026 Oct 1. PMID 42895211
- Zhang Z, Zhang X, Wang C. Associations of Serum MOTS-c with Exercise Capacity and Antioxidant Markers in Young Males: A Cross-Sectional Study. 2026 Oct 1. PMID 42939841
- Wang J, Luo S, Han Y. Mots-c attenuates diabetic nephropathy by downregulating LARS1 to promote lipophagy and suppress tubular senescence. 2026 Oct 23. PMID 42918312
- Li S, Ai L, Ge L. MOTS-c attenuates placental vascular endothelial cell apoptosis in intrahepatic cholestasis of pregnancy by inhibiting K33-linked deubiquitination of BACH1. 2026 Jul 29. PMID 42934731
- Wang P, Tao W, Wen H. Integrative transcriptomic and computational analysis associates Ms4a6c+ macrophages with fibrosis in radiation proctitis and computationally nominates MOTS-c as a candidate modulator. 2026. PMID 42952740
RUO For laboratory research use only. Not for human or veterinary use. This page summarises published studies and is not medical advice.