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miRNA-126 Orchestrates an Oncogenic Program in B Cell Precursor Acute Lymphoblastic Leukemia
Silvia Nucera1, Alice Giustacchini2, Francesco Boccalatte2
1San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy.
Cancer Cell
|June 15, 2016
Summary
MicroRNA-126 drives B cell leukemia in mice. Inhibiting this microRNA halts cancer growth and promotes cell cycle regulation, offering a potential therapeutic strategy for B-cell acute lymphoblastic leukemia (B-ALL).
Area of Science:
- Hematology
- Molecular Biology
- Oncology
Background:
- MicroRNA (miRNA)-126 regulates hematopoietic stem cell quiescence.
- Dysregulation of miRNA expression is implicated in leukemogenesis.
Purpose of the Study:
- To investigate the role of miRNA-126 in B cell development and its potential as a therapeutic target in B-cell acute lymphoblastic leukemia (B-ALL).
Main Methods:
- Engineered murine hematopoiesis for inducible miRNA-126 expression.
- Utilized tetracycline-repressible miRNA-126 cassettes to control expression.
- Assessed B cell leukemia development, regression, and molecular changes.
- Investigated p53 pathway involvement and miRNA-126's effect on p53 activity.
- Tested miRNA-126 antagonism in human B-ALL xenograft models.
Main Results:
- Overexpression of miRNA-126 in mice led to monoclonal B cell leukemia in 30% of cases.
- Switching off miRNA-126 expression prevented or induced regression of leukemia.
- Regression involved upregulation of cell-cycle regulators and B cell differentiation genes, and downregulation of oncogenic pathways.
- p53 inhibition was crucial for miRNA-126-driven leukemia.
- Forced miRNA-126 expression reduced p53 transcriptional activity in mouse and human progenitors.
- miRNA-126 antagonism in xenografts induced apoptosis and reduced disease burden.
Conclusions:
- miRNA-126 is oncogenic in B cell development and drives B-ALL.
- Reversible control of miRNA-126 expression can halt or reverse leukemia progression.
- Targeting miRNA-126 is a promising therapeutic strategy for B-ALL.
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