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Mitochondrial & Metabolic Peptides

In-vitro and preclinical literature on MOTS-c, NAD+, 5-Amino-1MQ, AOD-9604: mechanisms, model systems and 16 PubMed-linked references.

✔ PubMed-linked citations   ✔ In-vitro and preclinical only   ✔ Research Use Only

This class groups research compounds that are studied for their relationship to mitochondrial signaling, cellular energy-sensing pathways (AMPK, sirtuins, NAD+ homeostasis) and adipose lipid metabolism. It includes a mitochondrial-genome-encoded peptide (MOTS-c), an endogenous redox coenzyme (NAD+), a small-molecule NNMT inhibitor (5-Amino-1MQ) and a synthetic C-terminal fragment of human growth hormone (AOD-9604). The published literature is predominantly in-vitro (cultured adipocytes, myoblasts, HEK293 and HepG2 cells) and rodent work in diet-induced obesity, ovariectomy, aging and injury models, together with mechanistic reviews of NAD+ biology. These materials are supplied for laboratory research only; the studies cited below do not establish safety or efficacy in humans and nothing here should be read as a therapeutic or dosing recommendation.

This page collects 16 peer-reviewed references across 4 compounds. Every citation links to its PubMed record so the primary source can be read in full. The selection is limited to in-vitro, ex-vivo and preclinical animal studies and mechanistic reviews; human clinical literature is deliberately excluded because Liv Pure products are supplied for laboratory research only.

MOTS-c

Also known as: Mitochondrial open reading frame of the 12S rRNA type-c; mitochondrial-derived peptide (MDP); 16-amino-acid peptide (MRWQEMGYIFYPRKLR)

Molecular target or pathway: Folate cycle / de novo purine biosynthesis inhibition leading to AMPK activation; AMPK-dependent nuclear translocation and interaction with stress-responsive transcription factors including NRF2 (NFE2L2)

Origin: Endogenous peptide encoded by a short open reading frame within the mitochondrial 12S rRNA gene; supplied as a synthetic peptide

MOTS-c was identified in 2015 as a mitochondrial-genome-encoded peptide with skeletal muscle as its apparent primary target tissue. Preclinical work has characterised its effects on the folate-methionine cycle, AMPK signalling, nuclear gene expression under metabolic stress, adipose tissue homeostasis and age-related physical decline in mice. Human data are limited to observational measurements of endogenous MOTS-c after exercise; no human interventional data are cited here.

Liv Pure supplies MOTS-c as a lyophilized research reagent with a lot-specific certificate of analysis.

Selected references

  1. Lee C et al. (2015). Cell Metab. HEK293 and HeLa cells; C57BL/6 and ICR mice on high-fat diet. Identified MOTS-c as a 16-amino-acid peptide encoded in the mitochondrial 12S rRNA and reported that it inhibited the folate cycle and de novo purine biosynthesis, activated AMPK, and was associated with reduced diet-induced and age-dependent insulin resistance in mice. PMID 25738459 · DOI
  2. Kim KH et al. (2018). Cell Metab. HEK293 and HepG2 cells under glucose restriction. Observed AMPK-dependent translocation of MOTS-c to the nucleus following metabolic stress, where it regulated genes containing antioxidant response elements and interacted with NRF2. PMID 29983246 · DOI
  3. Lu H et al. (2019). J Mol Med (Berl). Ovariectomised C57BL/6 mice; adipocytes. MOTS-c administration was associated with reduced fat accumulation, increased brown adipose activity and AMPK pathway activation in ovariectomised mice, and an AMPK blocker attenuated its effects on adipocyte lipid metabolism. PMID 30725119 · DOI
  4. Reynolds JC et al. (2021). Nat Commun. Young, middle-aged and old C57BL/6 mice; C2C12 myoblasts; metabolomics. Reported that MOTS-c regulated nuclear genes related to metabolism and proteostasis, altered skeletal muscle metabolism and myoblast adaptation to metabolic stress, and was associated with increased physical capacity in mice across ages. PMID 33473109 · DOI

NAD+

Also known as: Nicotinamide adenine dinucleotide (oxidised form); beta-NAD; coenzyme I; related intermediates include nicotinamide mononucleotide (NMN) and nicotinamide riboside (NR)

Molecular target or pathway: Redox coenzyme for dehydrogenases; substrate for sirtuins (SIRT1-7), poly(ADP-ribose) polymerases (PARPs) and CD38; regulates nuclear-mitochondrial communication via SIRT1/PGC-1alpha and HIF-1alpha signalling

Origin: Endogenous metabolite synthesised de novo from tryptophan or via salvage from nicotinamide, NMN and NR; supplied as a synthetic/purified chemical

NAD+ is a central coenzyme linking cellular redox state to energy metabolism and to NAD+-consuming signalling enzymes such as sirtuins and PARPs. Tissue NAD+ levels decline with age in rodents and other model organisms, and preclinical studies have examined the consequences for mitochondrial oxidative phosphorylation and the effects of restoring NAD+ via precursors such as NMN. The literature includes human clinical trials of NAD+ precursors; only mechanistic reviews and mouse studies are cited here.

Liv Pure supplies NAD+ as a lyophilized research reagent with a lot-specific certificate of analysis.

Selected references

  1. Gomes AP et al. (2013). Cell. Aged mice; skeletal muscle; SIRT1 knockout. Reported an age-associated decline in nuclear NAD+ accompanied by HIF-1alpha accumulation under normoxia and loss of mitochondrially encoded OXPHOS subunits, and observed that raising NAD+ in old mice restored mitochondrial function markers in a SIRT1-dependent manner. PMID 24360282 · DOI
  2. Cantó C et al. (2015). Cell Metab. Review. Reviewed NAD+ biosynthesis and consumption pathways, sirtuin activation and the mitochondrial unfolded protein response as links between NAD+ status and energy homeostasis. PMID 26118927 · DOI
  3. Mills KF et al. (2016). Cell Metab. C57BL/6N mice, 12-month oral NMN administration. Orally administered NMN was converted to NAD+ in tissues and long-term administration was associated with changes in energy metabolism, mitochondrial oxidative metabolism and age-related gene expression in skeletal muscle of aging mice. PMID 28068222 · DOI
  4. Covarrubias AJ et al. (2020). Nat Rev Mol Cell Biol. Review. Reviewed the regulation of cellular NAD+ levels, NAD+-dependent enzymes (sirtuins, CD38, PARPs) and the decline of tissue NAD+ during ageing across model organisms. PMID 33353981 · DOI

5-Amino-1MQ

Also known as: 5-amino-1-methylquinolinium; 5-amino-1-methylquinolin-1-ium (often as the iodide salt); NNMTi; 5MQ

Molecular target or pathway: Nicotinamide N-methyltransferase (NNMT) inhibitor; downstream effects on intracellular 1-methylnicotinamide, NAD+ salvage flux, S-adenosylmethionine (SAM) and SIRT1 signalling

Origin: Synthetic small molecule (methylquinolinium scaffold); not a peptide

5-Amino-1MQ belongs to a series of membrane-permeable methylquinolinium inhibitors of NNMT, an enzyme that methylates nicotinamide and is upregulated in adipose tissue and liver in rodent obesity models. In-vitro studies in adipocytes and C2C12 myoblasts and in-vivo studies in diet-induced obese and aged mice have measured NNMT product levels, NAD+/SAM changes, lipogenesis, adipose mass and muscle stem cell activity. The genetic rationale for NNMT as a target comes from antisense knockdown work in mice.

Liv Pure supplies 5-Amino-1MQ as a lyophilized research reagent with a lot-specific certificate of analysis.

Selected references

  1. Kraus D et al. (2014). Nature. C57BL/6 mice on high-fat diet with antisense NNMT knockdown; cultured adipocytes. NNMT knockdown in white adipose tissue and liver was associated with increased cellular energy expenditure, increased adipose SAM and NAD+ levels and altered polyamine flux and histone H3K4 methylation. PMID 24717514 · DOI
  2. Neelakantan H et al. (2017). Biochem Pharmacol. PAMPA and Caco-2 permeability assays; 3T3-L1 adipocytes; diet-induced obese C57BL/6 mice. Methylquinolinium NNMT inhibitors showed selectivity over related methyltransferases and NAD+ salvage enzymes, reduced intracellular 1-methylnicotinamide, increased NAD+ and SAM, suppressed lipogenesis in adipocytes, and were associated with reduced body weight and white adipose mass in obese mice. PMID 29155147 · DOI
  3. Neelakantan H et al. (2019). Biochem Pharmacol. 24-month-old mice with barium chloride muscle injury; C2C12 myoblasts. NNMT inhibitor treatment was associated with increased muscle stem cell proliferation and fusion, larger regenerating myofiber cross-sectional area and altered NAD+/NADH redox state in myoblast differentiation assays. PMID 30753815 · DOI
  4. Dimet-Wiley A et al. (2022). Sci Rep. Diet-induced obese C57BL/6 mice switched to low-fat diet; cecal 16S microbiome sequencing. Combined 5-amino-1-methylquinolinium treatment and low-fat diet switch was associated with a distinct cecal microbiome pattern, including decreased Erysipelatoclostridium and increased Lactobacillus relative abundance, compared with vehicle. PMID 35013352 · DOI

AOD-9604

Also known as: hGH fragment 176-191; Tyr-hGH 177-191; modified C-terminal fragment of human growth hormone; AOD9604

Molecular target or pathway: Lipolytic domain of hGH; associated with increased beta-3 adrenergic receptor expression and lipolysis in adipose tissue; does not bind the hGH receptor or stimulate hGH-receptor-mediated proliferation

Origin: Synthetic analog of the C-terminal 176-191 region of human growth hormone with an N-terminal tyrosine

AOD-9604 is a synthetic peptide corresponding to the C-terminal lipolytic domain of human growth hormone. Rodent studies in ob/ob mice, obese Zucker rats and beta-3-AR knockout mice measured fat oxidation, lipolysis, beta-3-AR RNA expression, body weight gain and insulin sensitivity, and in-vitro binding assays showed no competition at the hGH receptor. Human clinical trials in obesity were conducted later and are not included in this research library; one rabbit osteoarthritis model is cited as the sole non-metabolic preclinical study.

Liv Pure supplies AOD-9604 as a lyophilized research reagent with a lot-specific certificate of analysis.

Selected references

  1. Ng FM et al. (2000). Horm Res. Obese Zucker rats, 19-day oral administration; euglycemic clamp. Oral AOD9604 was associated with reduced body weight gain and increased adipose tissue lipolytic activity in obese Zucker rats, with no change in insulin sensitivity measured by euglycemic clamp. PMID 11146367 · DOI
  2. Heffernan MA et al. (2001). Int J Obes Relat Metab Disord. Ob/ob and lean C57BL/6J mice with 14-day osmotic pump infusion; BaF-BO3 cells expressing the hGH receptor. AOD9604 was associated with reduced body weight gain, increased in-vivo fat oxidation and increased plasma glycerol in obese mice, and did not compete for 125I-hGH receptor binding or induce proliferation in hGH-receptor-transfected cells. PMID 11673763 · DOI
  3. Heffernan M et al. (2001). Endocrinology. Obese mice and beta-3-adrenergic receptor knockout mice, 14-day intraperitoneal administration. Chronic AOD9604 was associated with increased beta-3-AR RNA expression in adipose tissue of obese mice; the chronic weight and lipolysis changes were absent in beta-3-AR knockout mice, although acute increases in energy expenditure and fat oxidation persisted. PMID 11713213 · DOI
  4. Kwon DR et al. (2015). Ann Clin Lab Sci. Collagenase-induced knee osteoarthritis model in New Zealand white rabbits; weekly intra-articular injection. Intra-articular AOD9604, alone or with hyaluronic acid, was associated with lower gross morphological and histopathological cartilage scores and shorter lameness period than saline in the rabbit model (no DOI assigned by the journal). PMID 26275694

Frequently asked questions

Which pathways are most often measured when these compounds are studied in cell and animal models?

The literature centres on AMPK phosphorylation, folate/one-carbon metabolism, NAD+/NADH ratio and NAD+ salvage flux, sirtuin (SIRT1) activity, S-adenosylmethionine (SAM) levels, beta-3 adrenergic receptor expression and lipolysis/lipogenesis readouts in adipocytes. For MOTS-c, nuclear translocation and antioxidant-response-element gene regulation have also been reported in HEK293 and HepG2 cells. Researchers typically pair a biochemical readout (e.g. western blot for p-AMPK, LC-MS for 1-methylnicotinamide) with a physiological readout in the animal model.

What model systems appear in the cited studies?

Common in-vitro systems include 3T3-L1 and primary adipocytes, C2C12 myoblasts, HEK293, HepG2 and HeLa cells, and hGH-receptor-transfected BaF-BO3 cells for receptor-binding controls. In-vivo work uses C57BL/6 diet-induced obese mice, ob/ob mice, beta-3-AR knockout mice, obese Zucker rats, ovariectomised mice, aged (22-24 month) mice and a collagenase-induced rabbit knee model. Human clinical trials exist for some of these compounds but are outside the scope of this research library.

How should lyophilised peptides and NAD+ be handled and stored in the laboratory?

General laboratory practice for lyophilised peptides is storage at -20 °C or below, protected from light and moisture, with vials allowed to reach room temperature before opening to limit condensation. Reconstituted solutions are usually aliquoted to avoid repeated freeze-thaw cycles and used within the timeframe validated by the lab. NAD+ is hygroscopic and sensitive to alkaline pH and heat; solutions are typically prepared fresh in buffered media. Consult the certificate of analysis for each lot and follow your institution's chemical hygiene plan.

All compounds referenced on this page are supplied by Liv Pure for in-vitro laboratory research only and are not for human or animal use. Nothing on this page is medical advice, and no statement here has been evaluated by the Food and Drug Administration. Product identity and purity for each lot are documented on the certificate of analysis; our Testing and Quality page explains what those certificates do and do not measure. Browse the Mitochondrial & Metabolic Peptides category to see current lots.

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