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Rad knockdown induces mitochondrial apoptosis in bortezomib resistant leukemia and lymphoma cells

Seon-Yong Yeom1, Sook-Ja Lee, Won Seog Kim

  • 1Biomedical Research Institute, Samsung Medical Center, Seoul, Republic of Korea.

Leukemia Research
|June 5, 2012
PubMed

Insights

Ras associated with diabetes (Rad) overexpression drives bortezomib resistance in leukemia and lymphoma. Lowering Rad levels restores sensitivity and induces apoptosis, suggesting Rad as a therapeutic target.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Hematology

Background:

  • Bortezomib is a proteasome inhibitor used in treating multiple myeloma and mantle cell lymphoma.
  • Mechanisms of bortezomib resistance are not fully understood.
  • Identifying novel targets is crucial for overcoming drug resistance.

Purpose of the Study:

  • To elucidate the molecular mechanisms of bortezomib resistance in leukemia.
  • To identify genes differentially expressed in bortezomib-resistant leukemia cells.
  • To evaluate the role of Rad in bortezomib resistance.

Main Methods:

  • Microarray analysis to compare gene expression between resistant and sensitive cells.
  • Gene knockdown experiments to assess the functional role of Rad.
  • Correlation analysis between Rad expression and bortezomib resistance in various cell lines.

Main Results:

  • Rad mRNA levels were significantly higher in bortezomib-resistant Jurkat cells.
  • Rad knockdown sensitized cells to bortezomib, inducing apoptosis via Noxa/Bcl-2 modulation.
  • Elevated Rad expression correlated with increased bortezomib resistance across multiple leukemia and lymphoma cell lines.

Conclusions:

  • Rad overexpression is a key factor contributing to bortezomib resistance in leukemia and lymphoma.
  • Targeting Rad may represent a novel therapeutic strategy to enhance bortezomib sensitivity.

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