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A Chromatin Immunoprecipitation Assay to Identify Novel NFAT2 Target Genes in Chronic Lymphocytic Leukemia
09:52

A Chromatin Immunoprecipitation Assay to Identify Novel NFAT2 Target Genes in Chronic Lymphocytic Leukemia

Published on: December 4, 2018

BAFF and APRIL support chronic lymphocytic leukemia B-cell survival through activation of the canonical NF-kappaB

Tomoyuki Endo1, Mitsufumi Nishio, Thomas Enzler

  • 1Moores Cancer Center and Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, School of Medicine, University of California at San Diego, 3855 Health Sciences Drive, La Jolla, CA 92093-0820, USA.

Blood
|September 16, 2006
PubMed

Insights

Chronic lymphocytic leukemia (CLL) B cells utilize distinct pathways for survival signaling. Blocking the canonical NF-kappaB pathway, not BR3, inhibits BAFF and APRIL support for CLL cell survival, suggesting a therapeutic target.

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • Chronic lymphocytic leukemia (CLL) B cells express BAFF receptors BR3, BCMA, and TACI.
  • BAFF and APRIL are key cytokines influencing B cell survival and function.

Purpose of the Study:

  • To investigate the distinct roles of BAFF/APRIL receptors in CLL B cell signaling.
  • To identify the NF-kappaB pathways involved in BAFF/APRIL-mediated CLL cell survival.
  • To explore potential therapeutic targets for CLL.

Main Methods:

  • Flow cytometry to analyze receptor expression.
  • Stimulation of CLL cells with BAFF and APRIL.
  • Inhibition of NF-kappaB pathways using specific inhibitors (e.g., IKKbeta inhibitor) and transfection.
  • Assessment of cell survival in vitro.

Main Results:

  • BR3 signaling activates the alternative NF-kappaB pathway in CLL cells.
  • BCMA/TACI signaling activates the canonical NF-kappaB pathway.
  • Blocking BR3 did not affect BAFF-mediated CLL cell survival.
  • Inhibiting the canonical NF-kappaB pathway (via IKKbeta) blocked BAFF/APRIL-induced CLL cell survival.
  • Normal B cells rely on the alternative NF-kappaB pathway for BAFF-enhanced survival, unlike CLL cells.

Conclusions:

  • CLL B cell survival is critically dependent on the canonical NF-kappaB pathway, distinct from normal B cells.
  • Inhibitors of IKKbeta, crucial for canonical NF-kappaB activation, represent a potential therapeutic strategy for CLL.

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