MOTS-c
Mitochondrial ORF of the 12S rRNA type-c; mitochondrial-derived peptide (MDP)
MOTS-c is a 16-amino-acid mitochondrial-derived peptide encoded within an open reading frame of the mitochondrial 12S rRNA gene. It is one of a small family of mitochondrial-encoded peptides studied as putative regulators of metabolic homeostasis and cellular stress responses. Research has examined MOTS-c primarily in cell culture and rodent models, where its principal site of action appears to be skeletal muscle. In these model systems, investigators have studied how MOTS-c modulates the AMPK signaling pathway, influences the folate-methionine cycle and de novo purine biosynthesis, and affects glucose handling, insulin sensitivity, and mitochondrial bioenergetics. Subsequent work characterized MOTS-c as a stress-responsive peptide that can translocate from the cytoplasm to the nucleus to influence nuclear gene expression. Additional preclinical research has explored its relationship with exercise and PGC-1alpha-mediated mitochondrial biogenesis. The body of literature spans cellular mechanism, rodent models of diet-induced and age-related insulin resistance, and exercise physiology. Findings to date are derived from in vitro and animal studies; the peptide remains a subject of basic and translational investigation rather than established clinical application.
In cell and rodent models, MOTS-c has been reported to activate the AMPK signaling pathway, in part by inhibiting the folate cycle and tethered de novo purine biosynthesis, which was associated with changes in glucose uptake and insulin sensitivity in skeletal muscle. Under metabolic stress, MOTS-c has also been observed to translocate to the nucleus and modulate nuclear gene expression in an AMPK-dependent manner.
Note · Single mitochondrial-derived peptide (not a blend). Mechanistic and metabolic findings summarized here are drawn from in vitro and rodent studies.
This foundational study characterized MOTS-c as a 16-amino-acid mitochondrial-encoded peptide and reported that, in mouse models, its administration was associated with AMPK activation in skeletal muscle and with attenuation of diet-induced obesity and age- and high-fat-diet-related insulin resistance.
In cellular models, this study observed that under metabolic stress (such as glucose restriction) MOTS-c translocated from the cytoplasm to the nucleus and was associated with regulation of stress-responsive nuclear gene expression in an AMPK-dependent manner.
In a mouse model, this study examined MOTS-c administration combined with exercise and reported associations with increased PGC-1alpha expression, AMPK pathway activation, and changes in insulin sensitivity and glucose metabolism in skeletal muscle.
This review article summarized the early research literature on MOTS-c, discussing its proposed role as a mitochondrial-derived regulator of muscle and adipose metabolism and its reported links to AMPK signaling and metabolic homeostasis in preclinical models.
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