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Foxo1 regulates marginal zone B-cell development

Jing Chen1, Jose J Limon, Caroline Blanc

  • 1Department of Molecular Biology & Biochemistry, Institute for Immunology, University of California Irvine, Irvine, CA, USA.

European Journal of Immunology
|May 8, 2010
PubMed

Insights

Forkhead box O1 (Foxo1) controls B-cell subsets in the spleen. Foxo1 deficiency increases marginal zone B cells and corrects CD19-deficient B-cell issues, revealing its role in B-cell balance.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • B-cell receptor (BCR) and CD19 signaling activate phosphoinositide 3-kinase.
  • Protein kinase AKT phosphorylates substrates, including forkhead box O (Foxo) transcription factors.
  • Foxo1 plays distinct roles in B-cell development and function.

Purpose of the Study:

  • To investigate the role of Foxo1 in regulating mature B-cell subsets in the spleen.
  • To determine if Foxo1 controls the balance between marginal zone and follicular B cells.

Main Methods:

  • Conditional deletion of Foxo1 in B cells.
  • Analysis of B-cell subset populations in the spleen.
  • Examination of B-cell phenotypes in CD19-deficient mice.

Main Results:

  • Conditional deletion of Foxo1 in B cells increased marginal zone B cells and decreased follicular B cells.
  • Foxo1 deficiency rescued the marginal zone B-cell absence in CD19-deficient mice.
  • Foxo1 is essential for maintaining the normal ratio of splenic B-cell subsets.

Conclusions:

  • Foxo1 plays a previously unrecognized role in controlling the ratio of mature B-cell subsets.
  • Foxo1 is required for the marginal zone B-cell deficiency observed in CD19-deficient mice.
  • Foxo1 regulates B-cell subset balance and is a key player in splenic B-cell homeostasis.

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