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Updated: Jun 4, 2026
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A Chromatin Immunoprecipitation Assay to Identify Novel NFAT2 Target Genes in Chronic Lymphocytic Leukemia
Published on: December 4, 2018
STAT-3 activates NF-kappaB in chronic lymphocytic leukemia cells
Zhiming Liu1, Inbal Hazan-Halevy, David M Harris
1Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.
Molecular Cancer Research : MCR
|March 3, 2011
Summary
Unphosphorylated STAT-3 (USTAT-3) activates nuclear factor kappa B (NF-κB) in chronic lymphocytic leukemia (CLL) cells. This USTAT-3/NF-κB complex binds DNA, activating genes involved in CLL pathogenesis.
Area of Science:
- Molecular Biology
- Cancer Biology
- Immunology
Background:
- Nuclear factor kappa B (NF-κB) is crucial in B-cell neoplasm development.
- Chronic lymphocytic leukemia (CLL) cells exhibit high levels of unphosphorylated STAT-3 (USTAT-3).
- Previous research suggests USTAT-3 can activate NF-κB.
Purpose of the Study:
- To investigate if USTAT-3 activates NF-κB in CLL cells.
- To elucidate the mechanism of NF-κB activation in CLL.
Main Methods:
- Electrophoretic mobility shift assay (EMSA) to assess NF-κB DNA binding.
- Immunoprecipitation to detect protein interactions.
- Confocal microscopy to visualize protein complexes.
- Retroviral short hairpin RNA (shRNA) to inhibit STAT-3.
- Quantitative PCR (qPCR) to measure gene expression.
Main Results:
- NF-κB was constitutively activated in CLL cells.
- STAT-3 was found to bind to NF-κB p65.
- USTAT-3/NF-κB complexes were detected in the nuclei of CLL cells.
- STAT-3 inhibition reduced NF-κB DNA binding and downregulated NF-κB-regulated genes.
Conclusions:
- USTAT-3 binds to NF-κB p50/p65 dimers in CLL cells.
- The USTAT-3/NF-κB complex binds DNA and activates NF-κB-regulated genes.
- USTAT-3 plays a significant role in NF-κB activation and pathogenesis in CLL.
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