{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:47:22Z","timestamp":1785851242334,"version":"3.56.0"},"reference-count":56,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2023,3,17]],"date-time":"2023-03-17T00:00:00Z","timestamp":1679011200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Leibniz Collaborative Excellence","award":["CHROQ-K121\/2018"],"award-info":[{"award-number":["CHROQ-K121\/2018"]}]},{"name":"Leibniz Collaborative Excellence","award":["TRR130\/Project 08"],"award-info":[{"award-number":["TRR130\/Project 08"]}]},{"name":"the Deutsche Forschungsgemeinschaft (DFG)","award":["CHROQ-K121\/2018"],"award-info":[{"award-number":["CHROQ-K121\/2018"]}]},{"name":"the Deutsche Forschungsgemeinschaft (DFG)","award":["TRR130\/Project 08"],"award-info":[{"award-number":["TRR130\/Project 08"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>IgM is the first antibody to emerge during phylogeny, ontogeny, and immune responses and serves as a first line of defense. Effector proteins interacting with the Fc portion of IgM, such as complement and its receptors, have been extensively studied for their functions. IgM Fc receptor (Fc\u00b5R), identified in 2009, is the newest member of the FcR family and is intriguingly expressed by lymphocytes only, suggesting the existence of distinct functions as compared to the FcRs for switched Ig isotypes, which are expressed by various immune and non-hematopoietic cells as central mediators of antibody-triggered responses by coupling the adaptive and innate immune responses. Results from Fc\u00b5R-deficient mice suggest a regulatory function of Fc\u00b5R in B cell tolerance, as evidenced by their propensity to produce autoantibodies of both IgM and IgG isotypes. In this article, we discuss conflicting views about the cellular distribution and potential functions of Fc\u00b5R. The signaling function of the Ig-tail tyrosine-like motif in the Fc\u00b5R cytoplasmic domain is now formally shown by substitutional experiments with the IgG2 B cell receptor. The potential adaptor protein associating with Fc\u00b5R and the potential cleavage of its C-terminal cytoplasmic tail after IgM binding are still enigmatic. Critical amino acid residues in the Ig-like domain of Fc\u00b5R for interacting with the IgM C\u00b54 domain and the mode of interaction are now defined by crystallographic and cryo-electron microscopic analyses. Some discrepancies on these interactions are discussed. Finally, elevated levels of a soluble Fc\u00b5R isoform in serum samples are described as the consequence of persistent B cell receptor stimulation, as seen in chronic lymphocytic leukemia and probably in antibody-mediated autoimmune disorders.<\/jats:p>","DOI":"10.3390\/ijms24065728","type":"journal-article","created":{"date-parts":[[2023,3,20]],"date-time":"2023-03-20T04:33:31Z","timestamp":1679286811000},"page":"5728","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Physiological and Pathophysiological Roles of IgM Fc Receptor (Fc\u00b5R) Isoforms"],"prefix":"10.3390","volume":"24","author":[{"given":"Hiromi","family":"Kubagawa","sequence":"first","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caren","family":"Clark","sequence":"additional","affiliation":[{"name":"Institute of Cellular & Molecular Immunology, University Medical Center, 37073 G\u00f6ttingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6089-4769","authenticated-orcid":false,"given":"Christopher M.","family":"Skopnik","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedram","family":"Mahmoudi Aliabadi","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khlowd","family":"Al-Qaisi","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruth","family":"Teuber","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter K.","family":"Jani","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5753-0000","authenticated-orcid":false,"given":"Andreas","family":"Radbruch","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fritz","family":"Melchers","sequence":"additional","affiliation":[{"name":"Deutsches Rheuma-Forschungszentrum, 10117 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Niklas","family":"Engels","sequence":"additional","affiliation":[{"name":"Institute of Cellular & Molecular Immunology, University Medical Center, 37073 G\u00f6ttingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8278-7668","authenticated-orcid":false,"given":"J\u00fcrgen","family":"Wienands","sequence":"additional","affiliation":[{"name":"Institute of Cellular & Molecular Immunology, University Medical Center, 37073 G\u00f6ttingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1247","DOI":"10.1001\/jama.2019.13815","article-title":"Discovery of 2 Distinctive Lineages of Lymphocytes, T Cells and B Cells, as the Basis of the Adaptive Immune System and Immunologic Function: 2019 Albert Lasker Basic Medical Research Award","volume":"322","author":"Cooper","year":"2019","journal-title":"JAMA"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"820","DOI":"10.1038\/s41467-019-08677-1","article-title":"Differential organization of tonic and chronic B cell antigen receptors in the plasma membrane","volume":"10","author":"Wildhagen","year":"2019","journal-title":"Nat. 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