FOXO4-D-Retro-Inverso · FOXO4-DRI Senolytic
FOXO4-DRI is a synthetic D-retro-inverso peptide that disrupts the interaction between FOXO4 transcription factor and p53 in senescent cells. Senescent cells are damaged cells that have stopped dividing but resist apoptosis, accumulating with age and secreting inflammatory factors (SASP - senescence-associated secretory phenotype) that damage surrounding tissue. FOXO4-DRI selectively triggers apoptosis in senescent cells by preventing FOXO4 from sequestering p53 in the nucleus, allowing p53 to relocate to mitochondria and initiate cell death. This senolytic (senescent cell clearing) mechanism was published in Cell (2017) by Peter de Keizer's group.
Starting dose. Varies; protocols use mg/kg calculations
Run BEFORE repair peptides (senolytics clear senescent cells first, then rebuild). Any time of day. 3 doses EOD then months off.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
In senescent cells, FOXO4 binds p53 and sequesters it in the nucleus via PML (promyelocytic leukemia) nuclear bodies, preventing p53 from triggering apoptosis at the mitochondria. FOXO4-DRI is a modified peptide that competitively disrupts this FOXO4-p53 interaction. Once freed, p53 translocates to the mitochondrial outer membrane, activates Bax/Bak pore formation, releases cytochrome c, and triggers intrinsic apoptosis. Critically, this mechanism is selective for senescent cells because healthy cells do not rely on FOXO4-p53 nuclear sequestration for survival. The D-retro-inverso modification (D-amino acids in reversed sequence) provides resistance to proteolytic degradation while maintaining biological activity.
Days 1-7: No perceptible changes.
Weeks 2-8: Senescent cell clearance occurs. SASP reduction begins.
Months: Tissue renewal. Best assessed through biomarkers (p16, SASP markers).
Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.
FOXO4-DRI disrupts FOXO4-p53 binding and restores p53 apoptosis.
Disrupting this interaction with an all-D amino acid peptide (FOXO4-DRI) restores p53's apoptotic role and ameliorates the consequences of senescence-associated loss of tissue homeostasis.
Rejuvenation by Therapeutic Elimination of Senescent Cells.
Evidence scope. Commentary on the paired mouse study; exact peptide; preclinical only.
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: mg/kg SubQ or 3 mg EOD x3. No human abstract validated these protocols.
Human safety/off-target apoptosis. No same-route human abstract established safety.
Selective senolytic
SupportedPublished in Cell (2017). Selectivity for senescent cells confirmed in vitro and animal models. One of the few purpose-designed senolytic peptides.
Senescent cell accumulation is a recognized hallmark of aging. Clearance improves tissue function in animal models. Human longevity data not available.
Two different questions: what is documented about running these together, and what is documented about drawing them into the same syringe. A good pharmacological partner can still have to be pinned separately.
Check any specific pair in the Stack & Interaction Checker, which answers both questions separately. Absence of a documented conflict is not evidence of safety.
SubQ
Senolytic apoptosis cascade continues after peptide clearance
Slow enzymatic degradation (D-retro-inverso modification resists proteolysis)
Storage. Limited published stability data. Conservative 28-day estimate. BAC water 2-8C.
Not FDA-approved. Research peptide only. Newest and least established compound in the database.
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