The scaffold protein Cybr is required for cytokine-modulated trafficking of leukocytes in vivo

Vincenzo Coppola, Colleen A. Barrick, Sara Bobisse, Maria Cecilia Rodriguez-Galan, Michela Pivetta, Della Reynolds, O. M Zack Howard, Mary Ellen Palko, Pedro F. Esteban, Howard A. Young, Antonio Rosato, Lino Tessarollo

Research output: Contribution to journalArticle

Abstract

Trafficking and cell adhesion are key properties of cells of the immune system. However, the molecular pathways that control these cellular behaviors are still poorly understood. Cybr is a scaffold protein highly expressed in the hematopoietic/immune system whose physiological role is still unknown. In vitro studies have shown it regulates LFA-1, a crucial molecule in lymphocyte attachment and migration. Cybr also binds cytohesin-1, a guanine nucleotide exchange factor for the ARF GTPases, which affects actin cytoskeleton remodeling during cell migration. Here we show that expression of Cybr in vivo is differentially modulated by type 1 cytokines during lymphocyte maturation. In mice, Cybr deficiency negatively affects leukocytes circulating in blood and lymphocytes present in the lymph nodes. Moreover, in a Th1-polarized mouse model, lymphocyte trafficking is impaired by loss of Cybr, and Cybr-deficient mice with aseptic peritonitis have fewer cells than controls present in the peritoneal cavity, as well as fewer leukocytes leaving the bloodstream. Mutant mice injected with Moloney murine sarcoma/leukemia virus develop significantly larger tumors than wild-type mice and have reduced lymph node enlargement, suggesting reduced cytotoxic T-lymphocyte migration. Taken together, these data support a role for Cybr in leukocyte trafficking, especially in response to proinflammatory cytokines in stress conditions.

Original languageEnglish
Pages (from-to)5249-5258
Number of pages10
JournalMolecular and Cellular Biology
Volume26
Issue number14
DOIs
Publication statusPublished - Jul 2006

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

Fingerprint Dive into the research topics of 'The scaffold protein Cybr is required for cytokine-modulated trafficking of leukocytes in vivo'. Together they form a unique fingerprint.

  • Cite this

    Coppola, V., Barrick, C. A., Bobisse, S., Rodriguez-Galan, M. C., Pivetta, M., Reynolds, D., Howard, O. M. Z., Palko, M. E., Esteban, P. F., Young, H. A., Rosato, A., & Tessarollo, L. (2006). The scaffold protein Cybr is required for cytokine-modulated trafficking of leukocytes in vivo. Molecular and Cellular Biology, 26(14), 5249-5258. https://doi.org/10.1128/MCB.02473-05