FOXO4-DRI

FOXO4-DRI

FOXO4-DRI (Forkhead Box O4-D-Retro-Inverso) is a synthetic, structurally modified research peptidomimetic engineered to selectively interrupt the intracellular protein-protein interaction (PPI) between the FOXO4 transcription factor and the p53 tumor suppressor protein.

Constructed entirely from D-amino acids in a reversed sequence orientation (a D-retro-inverso configuration), FOXO4-DRI mimics the native p53-binding domain of endogenous FOXO4 while resisting standard proteolytic degradation. Within preclinical models of cellular senescence, this compound serves as a foundational senolytic tool, allowing investigators to study the targeted release and nuclear translocation of p53 to spark directed apoptotic signaling in senescent cell lines.

Structural Elements to Observe: The molecular model above shows the specialized stereochemical configuration necessary for targeting protein docking pockets. By utilizing D-enantiomers arranged in a retro-inverso sequence layout, FOXO4-DRI maintains the exact side-chain spatial topology of the native L-peptide domain. This allows it to fit precisely into the p53 binding groove, while its modified peptide bonds render it virtually invisible to ambient intracellular proteases, dramatically extending its experimental stability inside cell culture systems.

Technical Specifications

Research Applications & Mechanism of Interest

The utility of FOXO4-DRI inside cellular longevity and tissue remodeling assays depends entirely on its capacity to displace p53 from active FOXO4 complex architectures, thereby overriding the protective homeostatic thresholds of senescent cells.

Primary fields of in vitro and cell culture laboratory investigation include:

• FOXO4-p53 Interplay Disruption: Quantifying the competitive displacement kinetics of p53 from native FOXO4 assemblies. Breaking this complex permits p53 to translocate out of the nucleus and migrate directly toward the mitochondrial matrix.

• Senescent Cell Apoptosis Assays: Tracking the subsequent activation of the mitochondrial apoptotic pathway, characterized by localized cytochrome c release and heightened Caspase-3/7 enzyme cleavage.

• Selectivity Signaling Profiles: Evaluating the comparative survival curves of hydrogen peroxide- or stress-induced senescent cells versus healthy, proliferating control cell matrices to establish senolytic selectivity margins.

• Transcriptional Alteration Analysis: Monitoring real-time modifications in downstream p53 target genes, including the cycle-arrest marker p21 and metabolic regulators, under conditions of localized cellular stress.

Storage & Handling Guidelines

To maintain the structural spatial alignment of this large macromolecule and prevent premature peptide bond degradation:

• Lyophilized Powder Management: The dry, solid reference powder is reasonably stable at standard room temperature (15–25°C) for brief intervals if protected from ambient light. For permanent laboratory archiving, store the material continuously in a frozen state at -20°C or below.

• Reconstituted Assay Matrices: Once dissolved in ultra-pure molecular-grade water or sterile laboratory buffers, store liquid stock aliquots inside a regulated refrigeration environment at 2–8°C. Avoid repeated freeze-thaw cycles.

• Desiccation Standards: Protect from moisture ingress by keeping containers hermetically sealed inside a desiccated chamber to eliminate the risk of atmospheric peptide hydration.

• Aseptic Reconstitution: Always deploy sterile laboratory instruments and calibrated measuring tools during solution preparation to guarantee the chemical baseline remains free of biological contaminants.

• Analytical Auditing Validation: Kimera Chems enforces a strict third-party verification protocol utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) to independently audit structural sequence fidelity, mass distribution, and an absolute purity threshold of ≥99.0%.

Research Use Only Disclaimer: This product is developed, synthesized, and distributed strictly as a Research Use Only (RUO) laboratory reference chemical intended exclusively for non-clinical analytical and scientific investigation. It is not an FDA-approved drug formulation, active pharmaceutical ingredient, medical device, or cosmetic base, and is strictly prohibited for human or veterinary consumption. Kimera Chems supplies these ultra-pure peptidomimetic batches solely to accredited institutional laboratories and certified scientific investigators.

Scientific References

1. Baar, M. P., et al. (2017). “Targeted Apoptosis of Senescent Cells Restores Tissue Homeostasis in Response to Chemotoxicity and Aging.” Cell, 169(1), 132–147. DOI: 10.1016/j.cell.2017.02.031.

2. de Keizer, P. L. (2017). “The Fountain of Youth by Targeting Senescent Cells?” Trends in Molecular Medicine, 23(6), 482–484. DOI: 10.1016/j.molmed.2017.04.006.

3. Zhang, C., et al. (2020). “FOXO4-DRI alleviates age-related testosterone secretion insufficiency by targeting senescent Leydig cells.” Aging, 12(13), 12752–12764. DOI: 10.18632/aging.103309.