Comparison
DSIP vs. FOXO4-DRI
Two peptides side-by-side — identity, evidence base, legal status and known adverse events.
Identity
Category
Research other
Research other
CAS no.
62568-57-4
2074706-72-8
Molecular weight
848.81 g/mol
3735 g/mol
Half-life
0.1 h
0.5 h
Sequence
Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-GluD-Retro-Inverso-Variante eines FOXO4-Peptid-Fragments (LTLRKEPASEIAQSILEAYSQNGWANRRSGGKR — D-Aminosäuren in umgekehrter Sequenz)Mechanism of action
DSIP
DSIP was described in 1977 by the Schoenenberger-Monnier group in Basel as a blood-borne substance reported to induce EEG changes similar to delta sleep in animal models. The exact mechanism remains undefined to this day: no defined receptor, proposed modulation of opioid, GABAergic and glutamatergic systems. Most mechanistic findings stem from preclinical studies of the 1980s and 1990s and were later subjected to contested replication attempts.
FOXO4-DRI
FOXO4-DRI is the D-retro-inverso variant of a peptide fragment of the FOXO4 transcription factor. In senescent cells, FOXO4 is bound to p53, which suppresses p53-mediated apoptosis — the cells survive in a secreting 'zombie-like' state (senescence-associated secretory phenotype, SASP). The DRI peptide disrupts this FOXO4-p53 binding, freeing p53, and the senescent cell initiates apoptosis. Healthy cells are largely unaffected because p53 is not held back by FOXO4 in them. This selectivity was the central finding of the original 2017 publication.
Evidence base
Highest evidence
Human trial
Animal model
Studies
4
3
of which in humans
1
0
Effects recorded
3
3
Open conflicts
1
1
Documented adverse events
1
1