Discovery and characterization of an endogenous CXCR4 antagonist.
Fiche publication
Date publication
mai 2015
Auteurs
Membres identifiés du Cancéropôle Est :
Dr GALZI Jean-Luc
Tous les auteurs :
Zirafi O, Kim KA, Standker L, Mohr KB, Sauter D, Heigele A, Kluge SF, Wiercinska E, Chudziak D, Richter R, Moepps B, Gierschik P, Vas V, Geiger H, Lamla M, Weil T, Burster T, Zgraja A, Daubeuf F, Frossard N, Hachet-Haas M, Heunisch F, Reichetzeder C, Galzi JL, Perez-Castells J, Canales-Mayordomo A, Jimenez-Barbero J, Gimenez-Gallego G, Schneider M, Shorter J, Telenti A, Hocher B, Forssmann WG, Bonig H, Kirchhoff F, Munch J
Lien Pubmed
Résumé
CXCL12-CXCR4 signaling controls multiple physiological processes and its dysregulation is associated with cancers and inflammatory diseases. To discover as-yet-unknown endogenous ligands of CXCR4, we screened a blood-derived peptide library for inhibitors of CXCR4-tropic HIV-1 strains. This approach identified a 16 amino acid fragment of serum albumin as an effective and highly specific CXCR4 antagonist. The endogenous peptide, termed EPI-X4, is evolutionarily conserved and generated from the highly abundant albumin precursor by pH-regulated proteases. EPI-X4 forms an unusual lasso-like structure and antagonizes CXCL12-induced tumor cell migration, mobilizes stem cells, and suppresses inflammatory responses in mice. Furthermore, the peptide is abundant in the urine of patients with inflammatory kidney diseases and may serve as a biomarker. Our results identify EPI-X4 as a key regulator of CXCR4 signaling and introduce proteolysis of an abundant precursor protein as an alternative concept for chemokine receptor regulation.
Référence
Cell Rep. 2015 May 5;11(5):737-47