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Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

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Gadd45a deficiency accelerates BCR-ABL driven chronic myelogenous leukemia.

Kaushiki Mukherjee¹, Xiaojin Sha¹, Andrew Magimaidas^1,2

¹Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.

|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.

Keywords:

Gadd45a chronic myelogenous leukemia stress response protein tumor suppressor

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Published on: September 1, 2019

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.