CXCR1 and CXCR2 display receptor bias for shared chemokine agonists.

ABSTRACT: G protein-coupled receptors (GPCRs) mediate diverse signaling outputs through their proximal transducers: G proteins, GRKs, and β-arrestins. Although ligand bias at chemokine receptors (CKRs), where ligands for the same receptor display distinct signaling patterns, is well recognized, receptor bias, where the same agonist at different receptors yields distinct transducer engagement, remains poorly understood. We compared endogenous chemokine ligands (CXCL1, CXCL5, CXCL7, CXCL8) at the highly homologous CXCR1 and CXCR2 receptors using biosensor assays to measure Gαi activation, β-arrestin1/2 recruitment, GRK2/3/5/6 translocation, and receptor internalization. Our data reveal qualitatively different signaling patterns, most notably where CXCL1 acts as a G protein-biased partial agonist at CX

SUBMITTER: Jassal C 

PROVIDER: S-EPMC12621975 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature