Senescence biology · FOXO4-DRI
FOXO4-DRI: disrupting FOXO4–p53 binding in senescent cells
October 12, 2026 · 1 min read · Models: Mouse, Cell culture
FOXO4-DRI is a D-retro-inverso peptide designed to disrupt the interaction between FOXO4 and p53 in senescent cells. In a 2017 Cell paper it selectively triggered apoptosis of senescent cells in culture and was studied in fast-ageing and naturally aged mice.
A summary of published research for scientific reference. It is not product information or medical advice, and it does not describe or endorse use in humans or animals. Findings from cell culture and animal models often do not carry over to other systems.
Why target FOXO4?
Senescent cells stop dividing but resist apoptosis. They accumulate with age and after chemotherapy, and secrete inflammatory factors. Baar and colleagues found that the transcription factor FOXO4 is raised in senescent cells. It holds p53 in the nucleus, which prevents p53-driven apoptosis while keeping cell-cycle arrest.
Peptide design and findings
The team designed a peptide from the FOXO4 region that contacts p53. They built it from D-amino acids in reverse order (“D-retro-inverso”), which keeps side-chain orientation while resisting proteases. In culture, FOXO4-DRI released p53 into the cytoplasm and selectively killed senescent fibroblasts, sparing normal cells.
In mice, investigators examined chemotherapy-induced senescence in the liver and, in fast-ageing XpdTTD/TTD and naturally aged mice, tissue senescence markers alongside renal and physical measures (Baar et al., Cell, 2017).
Open questions
Senescent cells are diverse, and not all depend on the FOXO4–p53 axis. Independent replication of in-vivo effects, and comparison with small-molecule senolytics such as dasatinib plus quercetin or navitoclax, are active research areas.
References
- Baar MP, Brandt RMC, Putavet DA, et al. Targeted apoptosis of senescent cells restores tissue homeostasis in response to chemotoxicity and aging. Cell. 2017;169(1):132–147.
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