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    IL-21-Deficient T Follicular Helper Cells Support B Cell Responses Through IL-27 in Patients With Chronic Hepatitis B.

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    Author
    Khanam, Arshi
    Ayithan, Natarajan
    Tang, Lydia
    Poonia, Bhawna
    Kottilil, Shyam
    Date
    2021-01-28
    Journal
    Frontiers in Immunology
    Publisher
    Frontiers Media S.A.
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://doi.org/10.3389/fimmu.2020.599648
    Abstract
    Chronic Hepatitis B (CHB) affects over 350 million people worldwide. Current treatment does result in reduced complications; however, a cure (development of antibodies to the S antigen) is not achieved, requiring life-long therapy. Humoral responses contribute to viral elimination by secreting neutralizing antibodies; though, effective induction of humoral immunity require CD4T cell differentiation into T follicular helper (TFH) cells that support B cell response through interleukin-21 (IL-21). In CHB, mechanism of TFH-B interactions is seldom described. During CHB, TFH cells are defective in producing IL-21 in response to hepatitis B surface antigen (HBsAg). However, regardless of low IL-21, TFH cells efficiently support B cell responses by producing interleukin-27 (IL-27), which directs the formation of plasmablasts and plasma cells from memory and naïve B cells by enhancing B lymphocyte-induced maturation protein-1. IL-27 not only improved total antibody production but HBsAg-specific IgG and IgM secretion that are essential for viral clearance. Importantly, IL-27+TFH cells were significantly associated with HBV DNA reduction. Therefore, these findings imply a novel mechanism of TFH mediated B cell help in CHB and suggest that IL-27 effectively compensate the function of IL-21 by supporting TFH-B cell function, required for protective antibody response and may contribute to viral clearance by providing potential target for achieving a functional cure.
    Rights/Terms
    Copyright © 2021 Khanam, Ayithan, Tang, Poonia and Kottilil.
    Keyword
    B cells
    TFH cells
    chronic hepatitis B
    interleukin-21
    interleukin-27
    Identifier to cite or link to this item
    http://hdl.handle.net/10713/14757
    ae974a485f413a2113503eed53cd6c53
    10.3389/fimmu.2020.599648
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