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Defective development and function of Bcl10-deficient follicular, marginal zone and B1 B cells

Liquan Xue1, Stephan W Morris, Carlos Orihuela

  • 1Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.

Nature Immunology
|August 12, 2003
PubMed

Insights

Bcl10 protein is crucial for B cell development and function. Its absence impairs B cell maturation, proliferation, and antibody responses, highlighting its essential role in the immune system.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Bcl10 is an intracellular protein vital for nuclear factor (NF)-kappaB activation following lymphocyte antigen receptor stimulation.
  • NF-kappaB signaling is critical for immune cell development and function.

Purpose of the Study:

  • To investigate the role of Bcl10 in B cell development and function using a knockout mouse model.
  • To elucidate the impact of Bcl10 deficiency on B cell subset populations and their responses to stimulation.

Main Methods:

  • Utilized Bcl10 knockout mice (Bcl10-/-) to study B cell development and immune responses.
  • Analyzed B cell populations, proliferation, NF-kappaB activation, and antigen capture in Bcl10-deficient mice.

Main Results:

  • Absence of Bcl10 impeded transitional type 2 to mature follicular B cell conversion, decreasing marginal zone and B1 B cells.
  • Bcl10-deficient B cells showed impaired proliferation, with marginal zone B cells exhibiting inefficient NF-kappaB activation and antigen capture.
  • Bcl10-/- mice failed to initiate humoral responses and clear blood-borne bacteria.

Conclusions:

  • Bcl10 is essential for the development of all mature B cell subsets, including follicular, marginal zone, and B1 cells.
  • Bcl10 plays a critical role in B cell proliferation, NF-kappaB activation, and effective humoral immunity.
  • Bcl10 deficiency leads to impaired immune responses and susceptibility to bacterial infections.

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