HAUSP compartmentalization in chronic myeloid leukemia
Alessandro Morotti1, Cristina Panuzzo, Sabrina Crivellaro
1Department of Clinical and Biological Sciences, University of Turin, San Luigi Hospital, Orbassano, Italy.
European Journal of Haematology
|August 2, 2014
Summary
In chronic myeloid leukemia (CML), the protein phosphatase and tensin homolog (PTEN) is crucial. Our study reveals that the Hepatitis A Virus Histone fold mimic domain-containing protein tyrosine phosphatase (HAUSP) shuttles between the cytoplasm and nucleus in CML cells, impacting PTEN regulation.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- PTEN is vital in chronic myeloid leukemia (CML) pathogenesis.
- BCR-ABL oncogene promotes PTEN nuclear exclusion via HAUSP modulation.
Purpose of the Study:
- Investigate HAUSP cellular compartmentalization in primary CML samples.
- Understand HAUSP's role in CML pathogenesis.
Main Methods:
- Analysis of HAUSP expression in normal vs. CML CD34+ cells.
- Assessment of HAUSP cellular localization (nucleus vs. cytoplasm).
Main Results:
- Normal CD34+ cells show predominantly nuclear HAUSP expression.
- CML CD34+ cells exhibit HAUSP expression in both nuclear bodies and cytoplasm.
Conclusions:
- HAUSP acts as a shuttling protein in CML.
- HAUSP binds BCR-ABL in the cytosol, undergoes phosphorylation, and regulates PTEN de-ubiquitination within nuclear bodies as part of a PML network.
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