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The multi-functional cellular adhesion molecule CD44 is regulated by the 8;21 chromosomal translocation
1Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA, USA.
Leukemia
|July 28, 2007
Summary
The 8;21 translocation in acute myeloid leukemia (AML) involves the AML1-ETO9a splice variant, which upregulates CD44 expression. This links the translocation to cell adhesion molecule regulation crucial for AML growth.
Area of Science:
- Hematology
- Molecular Biology
- Cancer Research
Background:
- The 8;21 translocation is a frequent chromosomal abnormality in acute myeloid leukemia (AML).
- A newly identified splice variant, AML1-ETO9a, contributes to leukemogenesis.
- CD44, a cell adhesion molecule, is implicated in myeloid leukemia pathogenesis.
Purpose of the Study:
- To investigate the leukemic potential of the AML1-ETO9a splice variant.
- To determine the effect of AML1-ETO9a on CD44 gene expression.
- To elucidate the regulatory mechanisms of CD44 in AML.
Main Methods:
- Microarray analysis using the murine FDCP-mix A4 cell line.
- Quantitative analysis of CD44 RNA and protein expression.
- Chromatin immunoprecipitation assays to assess gene promoter binding.
- Evaluation in an AML1-ETO9a leukemia mouse model.
Main Results:
- AML1-ETO9a significantly increased CD44 expression at both RNA and protein levels.
- AML1-ETO9a and AML1-ETO bind to the CD44 promoter at the chromatin level.
- CD44 regulation by AML1-ETO9a is context-dependent in a mouse model.
Conclusions:
- AML1-ETO and its splice variant AML1-ETO9a regulate CD44 gene expression.
- This regulation links the 8;21 translocation to a key cell adhesion molecule.
- CD44 plays a role in the growth and maintenance of AML blast/stem cells.
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