Memory B lymphocytes from secondary lymphoid organs interact with E-selectin through a novel glycoprotein ligand
AUTOR(ES)
Montoya, María C.
FONTE
American Society for Clinical Investigation
RESUMO
Recirculation of B lymphocytes through the secondary lymphoid organs is key for recognition and response to foreign antigen. B lymphocytes within secondary lymphoid organs comprise a heterogeneous population of cells at distinct differentiation stages. To ascribe a particular adhesive behavior to discrete B-cell subsets within secondary lymphoid organs, we investigated their functional interaction with endothelial selectins under flow. We describe herein the characterization of a subset of human tonsillar B cells that interact with E-selectin but not P-selectin. E-selectin–interacting B cells had a phenotype of non–germinal center (CD10–, CD38–, CD44+), memory (IgD–) cells. Furthermore, FucT-VII was expressed selectively in CD44+ E-selectin–adherent B lymphocytes. B-cell rolling on E-selectin required sialic acid but was independent of previously described selectin ligands. A novel glycoprotein ligand of 240 kDa carrying N-linked glycans was isolated from B-cell membranes by an E-selectin immunoadhesin. Binding of this protein was strictly Ca2+ dependent, was inhibited by a cell adhesion–blocking mAb against E-selectin, and required the presence of sialic acid but not N-linked carbohydrates. Our results enable us to assign to resident memory B lymphocytes a novel adhesion function, the rolling on E-selectin, that provides insights on the adhesion pathways involved in homing of memory B cells to tertiary sites.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=408468Documentos Relacionados
- P-selectin glycoprotein ligand-1–deficient mice have impaired leukocyte tethering to E-selectin under flow
- The E-Selectin Ligand Basigin/CD147 Is Responsible for Neutrophil Recruitment in Renal Ischemia/Reperfusion
- Cyclic AMP-independent ATF family members interact with NF-kappa B and function in the activation of the E-selectin promoter in response to cytokines.
- Quantifying rolling adhesion with a cell-free assay: E-selectin and its carbohydrate ligands.
- E-selectin is required for the antiangiogenic activity of endostatin