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The Peptide Clinic

Cellular health and longevity research

Everything on this page describes laboratory research. Compounds named here are supplied for in-vitro and analytical work by verified researchers only. None is a registered medicine in South Africa, none is approved for human or veterinary use, and nothing on this page is guidance for use in a person.

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This area covers compounds studied for their role in cellular energy metabolism and in the biology of ageing at the level of the cell: mitochondrial function, the coenzymes that redox reactions depend on, and the signalling that responds to metabolic stress. It is worth saying plainly that ageing biology is an active and contested field, and that a marker moving in a cell line is a long way from a claim about an organism.

CompoundsNAD+, MOTS-c
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What the research measures

Mitochondrial function

Respiration rate, membrane potential and ATP output in cultured cells, measured by extracellular flux analysis and related assays.

Redox and coenzyme pools

The ratio between oxidised and reduced forms of key coenzymes, which constrains the reactions a cell can run and is a standard endpoint in this literature.

Sirtuin-dependent signalling

Activity of enzymes whose function depends on coenzyme availability, and which sit in most proposed links between metabolism and ageing.

Senescence markers

Markers associated with cells that have stopped dividing but remain metabolically active, an endpoint with known measurement difficulties.

Compounds studied in this area

NAD+

Nicotinamide adenine dinucleotide

A coenzyme rather than a peptide, present in every living cell, that carries electrons between reactions. Its oxidised and reduced forms cycle continuously, and the ratio between them is one of the tighter constraints on cellular metabolism.

Research examines the size of the cellular pool, the salvage pathways that regenerate it, and its role as a required substrate for sirtuins and for DNA-repair enzymes. Reported decline of the pool with age is the observation that drives most of the interest, and the mechanisms behind that decline are still argued over.

MOTS-c

Mitochondrial open reading frame of the twelve S rRNA type-c

A short peptide of sixteen amino acids that is unusual in being encoded in mitochondrial DNA rather than nuclear DNA. It belongs to a small group of mitochondrial-derived peptides identified relatively recently.

Work centres on mitochondrial signalling to the nucleus, on folate and purine metabolism, and on the cellular response to metabolic stress. The literature is young compared with the coenzyme research above, and the mechanisms are correspondingly less settled.

Laboratory handling and storage

Lyophilised material is the stable form. It is normally held below freezing and protected from light.

Reconstituted material has a substantially shorter working life than the lyophilised form, and that window is the usual limiting factor in planning an experiment.

Repeated freeze and thaw cycles degrade peptide integrity, so single-use aliquots are the standard practice.

Handling, reconstitution and disposal are laboratory procedures and should follow the receiving facility's own written procedures and local regulations.

Further reading