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Related Experiment Videos

xid affects events leading to B cell cycle entry

K Brorson1, M Brunswick, S Ezhevsky

  • 1Office of Therapeutics Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892, USA. brorson@a1.cber.fda.gov

Journal of Immunology (Baltimore, Md. : 1950)
|July 1, 1997
PubMed
Summary

Bruton's tyrosine kinase (Btk) is crucial for B cell activation, preventing apoptosis and promoting cell cycle progression. Its absence causes defects in cyclin induction, impacting B cell development and function.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • X-linked agammaglobulinemia and xid mice have Bruton's tyrosine kinase (Btk) gene mutations, causing B cell defects.
  • Btk is an early activation kinase in B cells, but xid mutations don't eliminate its kinase activity.
  • Immediate signaling events like tyrosine phosphorylation occur in xid B cells, but they fail to divide and undergo apoptosis.

Purpose of the Study:

  • To determine when Btk kinase activity is essential for B cell progression beyond initial signaling.
  • To investigate early and late events in sIg-cross-linked xid B cells.
  • To understand Btk's role in B cell activation, apoptosis control, and cell cycle entry.

Main Methods:

  • Examined early and late signaling events in sIg-cross-linked xid B cells.

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  • Assessed proto-oncogene and nuclear factor induction.
  • Monitored cyclin and GAPDH mRNA levels, p27Kip1 degradation, and cell viability/apoptosis.

    • Main Results:

    • Proto-oncogene and nuclear factor induction occurred normally in xid cells.
    • Cyclin induction and increased GAPDH mRNA were not observed in xid cells.
    • Btk kinase is not essential for all G1 events, but its absence correlates with defective cyclin induction and failure to enter the cell cycle.

    Conclusions:

    • Btk kinase is critical for subsequent events leading to cyclin activation, not just immediate signaling and apoptosis control.
    • The failure of sIg-activated xid B cells to enter the cell cycle is linked to a defect in cyclin induction.
    • Btk plays a vital role in B cell activation, controlling apoptosis, and driving cell cycle progression through cyclin induction.