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

作     者：Chaohong LIU Margaret K. FALLEN Heather MILLER Arpita UPADHYAYA Wenxia SONG 

作者机构：Department of Cell Biology & Molecular Genetics University of Maryland College Park MD 20742 USA Department of Physics University of Maryland College Park MD 20742 USA Division of Immunology Children's Hospital of Chongqing Medical University Chongqing 400014 China 

出 版 物：《Frontiers in Biology》 (生物学前沿（英文版）)

年 卷 期：2013年第8卷第5期

页      面：475-485页

核心收录：

学科分类：071010[理学-生物化学与分子生物学] 081704[工学-应用化学] 07[理学] 08[工学] 071009[理学-细胞生物学] 09[农学] 090102[农学-作物遗传育种] 0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1001[医学-基础医学(可授医学、理学学位)] 0817[工学-化学工程与技术] 0901[农学-作物学] 0836[工学-生物工程] 0713[理学-生态学] 

主　　题：actin cytoskeleton endocytosis signal transduction receptor 

摘      要：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.