Epitalon (Epithalon, AEDG) vs Pinealon (EDR)

Epitalon (Epithalon, AEDG)

Epitalon, also spelled epithalon, is the synthetic tetrapeptide Ala-Glu-Asp-Gly, modelled on epithalamin, a peptide extract of bovine pineal gland. It came out of a Russian research programme on short regulatory peptides, and nearly all of the published work comes from that programme and its collaborators. The studies include cultured human cells, rodents and fruit flies, together with some human studies reported mostly in Russian-language journals. The topics are ageing biology, telomere maintenance and pineal function. Independent replication outside that group is limited, and the human data are sparse and come almost entirely from the same source.

Pinealon (EDR)

Pinealon is the synthetic tripeptide Glu-Asp-Arg (EDR), one of the short 'bioregulator' peptides described by a Russian research group. That group proposes that very short peptides can act on gene expression directly, without a conventional receptor, a view that has had little independent testing. Most published work on Pinealon comes from the same group and its collaborators. It consists of experiments in cultured neurons and other cells, rodent studies centred on the nervous system and oxidative stress, and computer modelling of how the peptide might bind DNA. Human data are very limited.

How Epitalon (Epithalon, AEDG) acts

No receptor for Epitalon has been identified, and most mechanistic proposals come from the same research school. Cell-culture studies from that group have reported induction of telomerase activity and telomere elongation in human somatic cells, which normally express little telomerase. Other papers propose that short peptides of this kind enter the nucleus and bind DNA or histones, altering the expression of particular genes; this idea has not been widely tested elsewhere. Animal studies have examined melatonin secretion by the pineal gland and circadian markers. The overall picture rests on a narrow base of laboratories.

How Pinealon (EDR) acts

The originating group has proposed that EDR enters cells and their nuclei and binds particular DNA sequences or histone proteins, changing the expression of nearby genes. Support for this comes mainly from molecular modelling and in vitro binding experiments. In cultured neurons and other cells exposed to oxidative stress, Pinealon has been reported to lower the accumulation of reactive oxygen species and to alter ERK1/2 (MAPK) signalling, and rodent studies from the same group have measured markers of oxidative damage in brain tissue. No specific receptor for the peptide has been identified, and independent confirmation of these mechanisms is limited.

The records side by side

• Type: Epitalon (Epithalon, AEDG), Tetrapeptide; Pinealon (EDR), Tripeptide
• Length: Epitalon (Epithalon, AEDG), 4 amino acids; Pinealon (EDR), 3 amino acids
• Molecular weight: Epitalon (Epithalon, AEDG), 390.35 g/mol; Pinealon (EDR), 418.40 g/mol
• Molecular formula: Epitalon (Epithalon, AEDG), C14H22N4O9; Pinealon (EDR), C15H26N6O8

Reading a comparison

A comparison places two records side by side; it does not merge them. Each description above is drawn from that compound's own record, and the two were not necessarily characterised by the same methods, at the same time, or to the same level of detail. Before comparing any attribute, it is worth establishing that both records describe the substance you think they describe — names are not identifiers, and two entries sharing a name can differ in salt form, stereochemistry or the convention used to state a mass. Where a figure carries no method beside it, the comparison is between two reported numbers rather than between two measurements.