ATI 2341 is a pepducin targeting the C-X-C chemokine receptor type 4 (CXCR) at which it is an allosteric agonist with an EC50 of 194 nM. ATI 2341 functions as a biased ligand, favouring Galphai activation over Galpha13. In contrast to the the natural CXCR4 agonist, stromal cell-derived factor-1alpha, ATI 2341 does not promote beta-arrestin recruitment. ATI 2341 induces chemotaxis in CXCR4 expressing cells in vitro and acts as a functional antagonist to mobilise polymorphonuclear neutrophils and hematopoietic stem and progenitor cells from bone marrow niche in both mice and non-human primates.
