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Published on: December 31, 2014
Selection against PUMA gene expression in Myc-driven B-cell lymphomagenesis
Sean P Garrison1, John R Jeffers, Chunying Yang
1Department of Biochemistry, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105, USA.
Molecular and Cellular Biology
|June 25, 2008
Summary
The proapoptotic protein PUMA, a target of the p53 tumor suppressor, is silenced in human Burkitt lymphomas. Reactivating PUMA may offer a novel therapeutic strategy for these malignancies.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- The p53 tumor suppressor pathway is crucial for preventing cancer by promoting cell cycle arrest or apoptosis.
- PUMA (p53 upregulated modulator of apoptosis) is a key proapoptotic protein regulated by p53.
Purpose of the Study:
- To investigate the role of PUMA in lymphomagenesis within the Emu-Myc mouse model.
- To determine the frequency and mechanisms of PUMA downregulation in human Burkitt lymphomas.
- To explore PUMA as a potential therapeutic target in Burkitt lymphoma.
Main Methods:
- Utilized the Emu-Myc mouse model of Burkitt lymphoma.
- Assessed PUMA protein expression in mouse lymphomas and primary human Burkitt lymphomas.
- Investigated the role of DNA methylation in PUMA silencing using Burkitt lymphoma cell lines.
- Examined the effect of DNA methyltransferase inhibition on PUMA expression.
Main Results:
- Puma deletion accelerated lymphomagenesis in Emu-Myc mice.
- Approximately 75% of Emu-Myc lymphomas showed reduced Puma protein expression.
- About 40% of primary human Burkitt lymphomas lacked detectable PUMA expression.
- PUMA silencing in human tumors and cell lines was associated with DNA methylation, reversible by methyltransferase inhibition.
Conclusions:
- PUMA is frequently silenced in human Burkitt lymphomas, often via DNA methylation.
- Loss of PUMA function contributes to lymphomagenesis.
- Targeting PUMA reactivation presents a promising therapeutic avenue for Burkitt lymphoma and potentially other human malignancies.
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