Question 1

What is MOTS-c?

Accepted Answer

MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA-c) is a 16-amino acid peptide encoded within the mitochondrial 12S rRNA gene, identified by Lee and colleagues at USC in 2015. It is unique among studied peptides in originating from the mitochondrial genome rather than the nuclear genome. MOTS-c has been studied in preclinical research for AMPK activation, mitochondrial-nuclear retrograde signaling, metabolic regulation, and aging biology. It is for in vitro research use only.

Question 2

How does MOTS-c work in research models?

Accepted Answer

In preclinical research models, MOTS-c is released from mitochondria under metabolic stress conditions and translocates to the nucleus, where it activates AMPK through an AICAR-related pathway. Published research documents downstream effects on glucose uptake gene expression (GLUT4), fatty acid oxidation (PGC-1alpha), and mitochondrial biogenesis. This mitochondria-to-nucleus communication axis represents a novel retrograde signaling mechanism characterized in published research. See /how-mots-c-works/ for the complete mechanism overview.

Question 3

What has MOTS-c been studied for in published research?

Accepted Answer

Published research has examined MOTS-c in metabolic regulation using high-fat diet rodent models (glucose tolerance, insulin sensitivity), exercise physiology studies (MOTS-c as an exercise-responsive mitokine), aging model research (age-related MOTS-c decline and supplementation effects), mitochondrial-nuclear retrograde signaling characterization, and in vitro AMPK pathway activation studies.

Question 4

What makes MOTS-c unique compared to other mitochondrial research compounds?

Accepted Answer

MOTS-c is unique in that it is encoded within the mitochondrial genome itself, making it the first identified mitochondrially encoded peptide with demonstrated nuclear translocation and gene regulatory function. This distinguishes it from compounds such as NAD+ and Epithalon that modulate mitochondrial function from outside the organelle. The discovery of MOTS-c opened a new field of mitochondrial open reading frame peptide (MOPE) research with ongoing publication activity.

Question 5

What is the half-life of MOTS-c in research models?

Accepted Answer

Published pharmacokinetic data for MOTS-c in plasma documents moderate stability for a 16-amino acid peptide, with measured circulating levels in both endogenous (exercise-induced) and exogenous supplementation contexts. Specific half-life values from published MOTS-c pharmacokinetic studies should be consulted for model-specific protocol timing design. Published metabolic studies document administration frequencies based on these pharmacokinetic parameters.

Question 6

How is MOTS-c stored for research use?

Accepted Answer

Research-grade MOTS-c should be stored as lyophilized powder at -20 degrees Celsius for long-term stability. Once reconstituted in sterile aqueous vehicle, solutions should be stored at 2 to 8 degrees Celsius and used within the handling period specified by the supplier. Published preclinical methodology sections document intraperitoneal administration in saline vehicle for rodent metabolic model studies.

Question 7

What purity standard should research-grade MOTS-c meet?

Accepted Answer

Research-grade MOTS-c should meet at least 98% purity by HPLC analysis with mass spectrometry confirmation of the 16-amino acid peptide molecular weight. Certificate of Analysis should include sequence verification for the complete MOTS-c sequence. Researchers should confirm sequence identity documentation in COA before using MOTS-c in mechanistic studies where sequence-specific effects are the research target.

Question 8

What AMPK activation research has been published for MOTS-c?

Accepted Answer

Published research by Lee and colleagues documented MOTS-c activating AMPK measured through phospho-AMPK Western blotting at threonine 172. Downstream phospho-ACC (acetyl-CoA carboxylase) was measured as a marker of AMPK-dependent fatty acid oxidation pathway activation. GLUT4 expression and translocation were characterized as AMPK downstream metabolic gene targets. These published molecular endpoint measurements have been replicated in multiple independent published studies.

Question 9

How has MOTS-c been studied in aging research?

Accepted Answer

Published aging research has documented declining circulating MOTS-c levels with age in rodent models, suggesting MOTS-c as an aging biomarker. Supplementation studies in aged rodent cohorts have examined restoration of metabolic parameters including glucose tolerance and exercise capacity. Research has also examined MOTS-c levels in human plasma samples across age groups in published observational studies. This aging-MOTS-c connection has positioned the compound as an area of active longevity research investigation.

Question 10

Where can researchers source MOTS-c for in vitro research?

Accepted Answer

Research-grade MOTS-c for in vitro use is available from Spartan Peptides with at least 98% HPLC-verified purity and Certificate of Analysis documentation. All MOTS-c is for in vitro research use only and is not intended for human consumption. Researchers should source MOTS-c from suppliers providing sequence verification and independent batch testing as part of COA documentation for this technically demanding 16-amino acid peptide.

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