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CD137 is required for M cell functional maturation but not lineage commitment.

En Hui Hsieh1, Xiomara Fernandez, Jing Wang

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The American Journal of Pathology
|July 10, 2010
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This summary is machine-generated.

The study reveals that CD137 (tumor necrosis factor receptor superfamily member 9) is crucial for M cell function in mucosal immunity. This interaction with B cells is vital for transporting particles and ensuring proper immune surveillance.

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Area of Science:

  • Immunology
  • Cell Biology
  • Gastroenterology

Background:

  • M cells are critical for mucosal immune surveillance, transporting antigens to lymphocytes.
  • The precise interactions between M cells and B lymphocytes during M cell development are not well understood.

Purpose of the Study:

  • To investigate the role of CD137 (TNFRSF9) in M cell development and function.
  • To elucidate the interaction between M cells and B cells in the context of mucosal immunity.

Main Methods:

  • Utilized a cell culture model for M cell differentiation.
  • Employed CD137-deficient mice and bone marrow irradiation chimeras.
  • Analyzed M cell morphology, progenitor development, and microparticle transcytosis.

Main Results:

  • CD137 deficiency in mice resulted in abnormal M cell morphology and impaired microparticle transcytosis.
  • M cell precursor induction was CD137-independent, but functional maturation required CD137 expression.
  • A two-step model of M cell differentiation involving CD137-CD137L interactions was proposed.

Conclusions:

  • CD137-CD137L interactions between M cells and B cells (or dendritic cells) are essential for the functional maturation of M cells.
  • This interaction is critical for effective mucosal immune surveillance and antigen transport.