title: Phosphorylation of collapsin response mediator protein 2 on Tyr-479 regulates CXCL12-induced T lymphocyte migration.
abstract: In the central nervous system, collapsin response mediator protein 2 (CRMP2) is a transducer protein that supports the semaphorin-induced guidance of axons toward their cognate target. However, we previously showed that CRMP2 is also expressed in immune cells and plays a crucial role in T lymphocyte migration. Here we further investigated the molecular mechanisms underlying CRMP2 function in chemokine-directed T-cell motility. Examining Jurkat T-cells treated with the chemokine CXCL12, we found that 1) CXCL12 induces a dynamic re-localization of CRMP2 to uropod, the flexible structure of migrating lymphocyte, and increases its binding to the cytoskeletal protein vimentin; 2) CXCL12 decreases phosphorylation of the glycogen synthase kinase-3beta-targeted residues CRMP2-Thr-509/514; and 3) tyrosine Tyr-479 is a new phosphorylation CRMP2 residue and a target for the Src-family kinase Yes. Moreover, phospho-Tyr-479 increased under CXCL12 signaling while phospho-Thr-509/514 decreased. The functional importance of this tyrosine phosphorylation was demonstrated by Y479F mutation that strongly reduced CXCL12-mediated T-cell polarization and motility as tested in a transmigration model and on neural tissue. We propose that differential phosphorylation by glycogen synthase kinase-3beta and Yes modulates the contribution of CRMP2 to cytoskeletal reorganization during chemokine-directed T-cell migration. In addition to providing a novel mechanism for T lymphocyte motility, our findings reveal CRMP2 as a transducer of chemokine signaling.
authors.affiliation: Department of Neurooncology and Neuroinflammation, INSERM, U842, Université de Lyon, Lyon, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Varrin-Doyer
authors.forename: Peggy
authors.initials: P
authors.lastname: Vincent
authors.forename: Sylvie
authors.initials: S
authors.lastname: Cavagna
authors.forename: Nathalie
authors.initials: N
authors.lastname: Auvergnon
authors.forename: Nelly
authors.initials: N
authors.lastname: Noraz
authors.forename: Véronique
authors.initials: V
authors.lastname: Rogemond
authors.forename: Jérôme
authors.initials: J
authors.lastname: Honnorat
authors.forename: Mahnaz
authors.initials: M
authors.lastname: Moradi-Améli
authors.forename: Pascale
authors.initials: P
authors.lastname: Giraudon
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000831:Animals, Newborn; D015153:Blotting, Western; D002448:Cell Adhesion; D002465:Cell Movement; D054377:Chemokine CXCL12 / Q000235:genetics / Q000378:metabolism*; D018925:Chemokines / Q000378:metabolism; D051360:Cyclin-Dependent Kinase 5; D003599:Cytoskeleton / Q000378:metabolism; D038362:Glycogen Synthase Kinase 3 / Q000378:metabolism; D006624:Hippocampus / Q000166:cytology / Q000378:metabolism; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D019169:Jurkat Cells; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D011487:Protein Conformation; D051575:Proto-Oncogene Proteins c-yes / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D013601:T-Lymphocytes / Q000166:cytology* / Q000378:metabolism; D014443:Tyrosine / Q000378:metabolism*; D019061:src-Family Kinases / Q000378:metabolism
chemical_list: D054377:Chemokine CXCL12; D018925:Chemokines; D036341:Intercellular Signaling Peptides and Proteins; D009419:Nerve Tissue Proteins; C095114:collapsin response mediator protein-2; D014443:Tyrosine; D051575:Proto-Oncogene Proteins c-yes; C489834:YES1 protein, human; D019061:src-Family Kinases; D051360:Cyclin-Dependent Kinase 5; D038362:Glycogen Synthase Kinase 3