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The actin cytoskeleton coordinates the signal transduction and antigen processing functions of the B cell antigen receptor

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Frontiers in Biology

Abstract

The B cell antigen receptor (BCR) is the sensor on the B cell surface that surveys foreign molecules (antigen) in our bodies and activates B cells to generate antibody responses upon encountering cognate antigen. The binding of antigen to the BCR induces signaling cascades in the cytoplasm, which provides the first signal for B cell activation. Subsequently, BCRs internalize and target bound antigen to endosomes, where antigen is processed into T cell recognizable forms. T helper cells generate the second activation signal upon binding to antigen presented by B cells. The optimal activation of B cells requires both signals, thereby depending on the coordination of BCR signaling and antigen transport functions. Antigen binding to the BCR also induces rapid remodeling of the cortical actin network of B cells. While being initiated and controlled by BCR signaling, recent studies reveal that this actin remodeling is critical for both the signaling and antigen processing functions of the BCR, indicating a role for actin in coordinating these two pathways. Here we will review previous and recent studies on actin reorganization during BCR activation and BCR-mediated antigen processing, and discuss how actin remodeling translates BCR signaling into rapid antigen uptake and processing while providing positive and negative feedback to BCR signaling.

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  1. Department of Cell Biology & Molecular Genetics, University of Maryland, College Park, MD, 20742, USA

    Chaohong Liu, Margaret K. Fallen, Heather Miller & Wenxia Song

  2. Department of Physics, University of Maryland, College Park, MD, 20742, USA

    Arpita Upadhyaya

  3. Division of Immunology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014, China

    Wenxia Song

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  1. Chaohong Liu
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Liu, C., Fallen, M.K., Miller, H. et al. The actin cytoskeleton coordinates the signal transduction and antigen processing functions of the B cell antigen receptor. Front. Biol. 8, 475–485 (2013). https://doi.org/10.1007/s11515-013-1272-0

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