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IL16 Promotes Plasma Cell Differentiation.

Ying Gao1, Jie Li1,2, Fangxia Li1

  • 1University of Chinese Academy of Sciences, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China.

Immunology
|June 11, 2025
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Interleukin 16 (IL16) promotes B cell differentiation into plasma cells, enhancing antibody production. This cytokine is crucial for immune responses, particularly against viral infections like influenza A.

Keywords:
B cellsIL16plasma cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • B cell terminal differentiation into plasma cells is a complex process regulated by transcription factors, epigenetics, and cytokines.
  • B cells produce interleukin 16 (IL16), a cytokine with known chemoattractant properties, but its specific role in B cell differentiation was unclear.

Purpose of the Study:

  • To investigate the role of interleukin 16 (IL16) in the terminal differentiation of B cells into plasma cells.
  • To determine if IL16 influences the expression of key transcription factors and immunoglobulin genes during B cell differentiation.

Main Methods:

  • Overexpression of IL16 in primary B cells.
  • Analysis of B cell differentiation markers (B220, CD138) and plasma cell transcription factors (Blimp-1, IRF4, Xbp-1).
  • Assessment of immunoglobulin gene expression.
  • In vivo studies using IL16-deficient mice infected with influenza A virus.

Main Results:

  • IL16 overexpression enhanced B cell differentiation into B220lowCD138+ plasma cells, independent of secreted IL16.
  • Overexpressed IL16 increased the expression of plasma cell transcription factors (Blimp-1, IRF4, Xbp-1) and immunoglobulin genes.
  • IL16-deficient mice showed reduced plasma cell numbers and lower production of virus-specific antibodies after influenza A infection.

Conclusions:

  • Interleukin 16 (IL16) plays a significant role in promoting the terminal differentiation of B cells into plasma cells.
  • IL16 is essential for effective humoral immune responses, including antibody production against viral pathogens.