IL-21 Promotes Intestinal Memory IgA Responses
The role of IL-21, produced mainly by Th17 cells and T follicular helper cells, has been intensively investigated in B cell differentiation and Ab class switch. However, how IL-21 regulates memory IgA B cell development and memory IgA responses in the intestines is still not completely understood. I...
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Published in | The Journal of immunology (1950) Vol. 205; no. 7; pp. 1944 - 1952 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.10.2020
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Subjects | |
Online Access | Get full text |
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Summary: | The role of IL-21, produced mainly by Th17 cells and T follicular helper cells, has been intensively investigated in B cell differentiation and Ab class switch. However, how IL-21 regulates memory IgA
B cell development and memory IgA responses in the intestines is still not completely understood. In this study, we found the total IgA
B cells as well as CD38
CD138
IgA
memory B cells were significantly increased in intestinal lamina propria (LP) of TCRβxδ
mice after transfer of microbiota Ag-specific Th17 cells but not Th1 cells. Although IL-21R
mice or IL-17R
mice showed decreased Ag-specific memory IgA production in the intestines upon infection with
, the percentage of IgA
CD38
CD138
memory B cells in Peyer's patches and LP was decreased only in IL-21R
mice, but not in IL-17R
mice, after reinfection with
compared with wild-type mice. Blockade IL-21 in vivo suppressed intestinal
-specific IgA production as well as IgA
CD38
CD138
memory B cells in Peyer's patches and LP. Furthermore, IL-21 significantly induced B cell IgA production in vitro, with the increased expression of genes related with class-switching and memory B cell development, including Aicda, Ski, Bmi1, and Klf2. Consistently, Aicda and Ski expression was decreased in B cells of IL-21R
mice after
reinfection. In conclusion, our study demonstrated that IL-21 promotes intestinal memory IgA B cell development, possibly through upregulating differentiation-related and class switching-related genes, indicating a potential role of IL-21 in memory IgA
B cell responses in the intestines. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These authors contributed equally to this work |
ISSN: | 0022-1767 1550-6606 |
DOI: | 10.4049/jimmunol.1900766 |