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Gadd45a deficiency accelerates BCR-ABL driven chronic myelogenous leukemia.
Kaushiki Mukherjee1, Xiaojin Sha1, Andrew Magimaidas1,2
1Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.
Oncotarget
|January 14, 2017
Summary
Loss of the Gadd45a gene accelerates BCR-ABL driven chronic myeloid leukemia (CML) in mice. Gadd45a acts as a leukemia suppressor, suggesting its potential as a prognostic marker for CML progression.
Area of Science:
- Molecular Biology
- Oncology
- Hematology
Background:
- Gadd45a is a stress-sensor gene within the Gadd45 family.
- Its role in chronic myeloid leukemia (CML) development is not fully understood.
Purpose of the Study:
- To investigate the function of GADD45A in BCR-ABL driven CML.
- To determine if Gadd45a acts as a tumor suppressor in CML.
Main Methods:
- Used a mouse model of CML by reconstituting irradiated mice with wild-type or Gadd45a-null myeloid progenitors expressing BCR-ABL.
- Analyzed leukemic stem/progenitor cell populations, proliferation, apoptosis, and signaling pathways (PI3K-AKT-mTOR-4E-BP1, p38, Stat5).
- Examined Gadd45a expression in CML patient samples across different disease phases.
Main Results:
- Loss of Gadd45a accelerated CML, leading to more aggressive disease and reduced survival in mice.
- Gadd45a-deficient cells showed increased proliferation and decreased apoptosis, linked to enhanced signaling pathways and altered transcription factors.
- Gadd45a expression was higher in indolent CML and lower in aggressive CML phases.
Conclusions:
- Gadd45a functions as a suppressor of BCR-ABL driven leukemia.
- Gadd45a may serve as a prognostic marker for CML progression.
