High-affinity IgM Memory B Cells Are Defective in Differentiation into IgM Antibody-secreting Cells by Re-stimulation with a T Cell-dependent Antigen
Authors
Affiliations
IgM antibodies (Abs) are thought to play a major role in humoral immunity but only at the early stage of the primary immune response. However, two subsets of IgM memory B cells (MBCs), one with high affinity gained by means of multiple somatic hypermutation (SHM) and the other with low affinity and no SHMs, are generated through the germinal center (GC)-dependent and GC-independent (non-GC) pathway, respectively, after immunization with (4-hydroxy-3-nitrophenyl)acetyl (NP)-chicken γ-globulin. Surprisingly, an analysis of antibody-secreting cells reveals that a large amount of anti-NP IgM Ab with few SHMs is secreted during the recall response, indicating that only non-GC MBCs have terminal differentiation potential. Since secondary IgM Abs are capable of binding to dinitrophenyl ligands, they likely provide broad cross-reactivity in defense against microbial infection.
Yoshizato R, Miura M, Shitaoka K, Matsuoka Y, Higashiura A, Yamamoto A Heliyon. 2024; 10(23):e40837.
PMID: 39698082 PMC: 11652855. DOI: 10.1016/j.heliyon.2024.e40837.
B cell subsets were associated with prognosis in elderly patients with community acquired pneumonia.
Wang C, Zhang Y, Xu H, Huo F, Li Y, Li Z BMC Pulm Med. 2022; 22(1):206.
PMID: 35610602 PMC: 9128775. DOI: 10.1186/s12890-022-01985-1.
Nishiguchi A, Murakami A, Azuma T, Oda M Protein J. 2022; 41(2):293-303.
PMID: 35501455 DOI: 10.1007/s10930-022-10053-w.
Immunoglobulin M in Health and Diseases: How Far Have We Come and What Next?.
Jones K, Savulescu A, Brombacher F, Hadebe S Front Immunol. 2020; 11:595535.
PMID: 33193450 PMC: 7662119. DOI: 10.3389/fimmu.2020.595535.