Abstract
Immunoglobulin (Ig) M is the first antibody isotype produced during an immune response and is critical for host defense against infections. Recent studies have revealed that IgM also plays an important role in immune regulation and immunological tolerance. Mice lacking secretory IgM not only exhibit impaired production of antigen-specific IgG and are more susceptible to bacterial and viral infections, but also produce autoantibodies and are prone to develop autoimmune diseases. For many years, IgM has been thought to function predominantly by binding to antigen and activating complement (C′) system. It is now clear that IgM can also elicit its function through the IgM Fc receptor (FcμR). In this chapter, we will review the role of FcμR in B cell development, maturation, survival and activation, antibody production, host defense against bacterial and viral infections, and B cell tolerance. We will also discuss the relative contribution of IgM-C′ and IgM-FcμR pathways in humoral immune responses. Finally, we will discuss the possible involvement of FcμR in human chronic lymphocytic leukemia.
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Acknowledgements
We thank Lumin Zhang for secretarial assistance and the members in Wang lab for helpful suggestions. This work was supported by the Major Research Plan of the National Natural Science Foundation of China (91942302 to J.Y.W.), the National Key R & D Plan of the Ministry of Science and Technology (SQ2019YFE0100600 to J.Y.W.), the National Natural Science Foundation of China (81571529 and 31870898 to J.Y.W), Projects of International Cooperation and Exchanges NSFC (81811540035 to J.Y.W.), a grant-in-aid for scientific research (C) from Japan Society for the Promotion of Science (17K08878 to J.Y.W), China Postdoctoral Science Foundation Grant (2018M641929 to J.L.), and National Natural Science Foundation for Young Scholar (81901594 to J.L.).
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Liu, J., Wang, Y., Min, Q., Xiong, E., Heyman, B., Wang, JY. (2020). Regulation of Humoral Immune Responses and B Cell Tolerance by the IgM Fc Receptor (FcμR). In: Wang, JY. (eds) B Cells in Immunity and Tolerance. Advances in Experimental Medicine and Biology, vol 1254. Springer, Singapore. https://doi.org/10.1007/978-981-15-3532-1_7
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