FOX04-DRI

Origin & Classification

FOXO4-DRI (forkhead box O4 D-retro-inverso peptide) is a synthetic peptide designed to interfere with the interaction between the transcription factor FOXO4 and the tumor suppressor protein p53. It is engineered in a D-retro-inverso configuration, meaning the amino acid sequence is reversed and comprised of D-amino acids, which confers resistance to proteolytic degradation. The peptide is synthesized by solid-phase methods and typically comprises around 36 amino acids. This structural configuration classifies FOXO4-DRI within the family of cell-permeable inhibitory peptides.

Mechanism & Research Context

FOXO transcription factors regulate gene expression related to oxidative stress, DNA repair, and apoptosis. In certain contexts, FOXO4 binds p53 in the nucleus of senescent cells, inhibiting p53-mediated apoptosis and thereby maintaining senescence. FOXO4-DRI competes with endogenous FOXO4 for p53 binding, leading to release of p53 and potential induction of apoptotic signaling in senescent cells. Researchers utilize FOXO4-DRI to explore molecular mechanisms of cellular senescence, p53 activation, and FOXO-mediated transcription. Investigations often assess downstream pathways such as Bax/Bcl-2, caspase cascades, and mitochondrial membrane potential changes, as well as broader implications for tissue homeostasis, aging, and stress responses. The peptide provides a tool for dissecting senescence signaling networks without making clinical claims.

Composition & Quality

FOXO4-DRI is provided as a lyophilized powder with purity above 95 %, as determined by analytical HPLC. The D-retro-inverso configuration ensures high stability and reduces susceptibility to proteases. Manufacturing processes follow GMP-aligned practices, including rigorous purification via chromatography and characterization by mass spectrometry. Quality assessments also include circular dichroism analysis for secondary structure, endotoxin testing, and solubility characterization. The peptide is typically reconstituted in sterile water or cell culture media for experimental application, and storage guidelines emphasize low-temperature conditions to maintain integrity.

Summary & Unified Disclaimer

This description summarizes the scientific context of the molecule. It is provided for educational and research discussion purposes only. It is not intended to diagnose, treat, cure, or prevent any disease, and no medical or consumption claims are made.