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Extrafollicular activation of lymph node B cells by antigen-bearing dendritic cells
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This article describes the visualization by two-photon microscopy of lymph node B cells that exit from high-endothelial venules to interact with Ag-loaded DCs. This finding suggests a possible role for Ag-specific interactions between B cells and DCs in promoting T cell-dependent B lymphocyte responses.
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Qi H., Egen J.G., Huang A.Y., and Germain R.N. Extrafollicular activation of lymph node B cells by antigen-bearing dendritic cells. Science 312 (2006) 1672-1676. This article describes the visualization by two-photon microscopy of lymph node B cells that exit from high-endothelial venules to interact with Ag-loaded DCs. This finding suggests a possible role for Ag-specific interactions between B cells and DCs in promoting T cell-dependent B lymphocyte responses.
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Science
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Qi, H.1
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LFA-1/ICAM-1 interaction lowers the threshold of B cell activation by facilitating B cell adhesion and synapse formation
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Carrasco Y.R., Fleire S.J., Cameron T., Dustin M.L., and Batista F.D. LFA-1/ICAM-1 interaction lowers the threshold of B cell activation by facilitating B cell adhesion and synapse formation. Immunity 20 (2004) 589-599
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Immunity
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Batista, F.D.5
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46
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B-cell activation by membrane-bound antigens is facilitated by the interaction of VLA-4 with VCAM-1
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Carrasco Y.R., and Batista F.D. B-cell activation by membrane-bound antigens is facilitated by the interaction of VLA-4 with VCAM-1. EMBO J 25 (2006) 889-899
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B cell ligand discrimination through a spreading and contraction response
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This group has previously shown that B cells can capture membrane-bound Ag through formation of an immunological synapse [51]. In this study, they show that this event is associated with a membrane spreading and contraction two-phase response. Spreading and contraction rely on BCR signaling and on the actin cytoskeleton, and allow concentration of the Ag at the membrane for efficient extraction. A mathematical model is presented to demonstrate that this process is important for extraction of membrane-bound Ag that have low affinity for the BCR.
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Fleire S.J., Goldman J.P., Carrasco Y.R., Weber M., Bray D., and Batista F.D. B cell ligand discrimination through a spreading and contraction response. Science 312 (2006) 738-741. This group has previously shown that B cells can capture membrane-bound Ag through formation of an immunological synapse [51]. In this study, they show that this event is associated with a membrane spreading and contraction two-phase response. Spreading and contraction rely on BCR signaling and on the actin cytoskeleton, and allow concentration of the Ag at the membrane for efficient extraction. A mathematical model is presented to demonstrate that this process is important for extraction of membrane-bound Ag that have low affinity for the BCR.
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Syk, activated by cross-linking the B-cell antigen receptor, localizes to the cytosol where it interacts with and phosphorylates alpha-tubulin on tyrosine
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Peters J.D., Furlong M.T., Asai D.J., Harrison M.L., and Geahlen R.L. Syk, activated by cross-linking the B-cell antigen receptor, localizes to the cytosol where it interacts with and phosphorylates alpha-tubulin on tyrosine. J Biol Chem 271 (1996) 4755-4762
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Wubbolts R., Fernandez-Borja M., Jordens I., Reits E., Dusseljee S., Echeverri C., Vallee R.B., and Neefjes J. Opposing motor activities of dynein and kinesin determine retention and transport of MHC class II-containing compartments. J Cell Sci 112 (1999) 785-795
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Vallee, R.B.7
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The pathway of antigen uptake and processing dictates MHC class II-mediated B cell survival and activation
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The authors compare the effect of engaging MHC class II-peptide complexes generated by BCR-mediated Ag uptake (type I complex) with those generated by fluid phase endocytosis (type II complex) on B-cell responses, as measured by their survival rate and expression of activation markers. They show that type I complexes lead to increased B-cell activation and survival, suggesting that appropriate Ag targeting is key to induce the relevant immune response.
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Nashar T.O., and Drake J.R. The pathway of antigen uptake and processing dictates MHC class II-mediated B cell survival and activation. J Immunol 174 (2005) 1306-1316. The authors compare the effect of engaging MHC class II-peptide complexes generated by BCR-mediated Ag uptake (type I complex) with those generated by fluid phase endocytosis (type II complex) on B-cell responses, as measured by their survival rate and expression of activation markers. They show that type I complexes lead to increased B-cell activation and survival, suggesting that appropriate Ag targeting is key to induce the relevant immune response.
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Nashar, T.O.1
Drake, J.R.2
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B cells acquire antigen from target cells after synapse formation
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Batista F.D., Iber D., and Neuberger M.S. B cells acquire antigen from target cells after synapse formation. Nature 411 (2001) 489-494
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(2001)
Nature
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Batista, F.D.1
Iber, D.2
Neuberger, M.S.3
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