European journal of haematology · 2014
HAUSP compartmentalization in chronic myeloid leukemia.
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Morotti Alessandro, Panuzzo Cristina, Crivellaro Sabrina, Carrà Giovanna, Guerrasio Angelo, Saglio Giuseppe
Аннотация
INTRODUCTION: PTEN plays an essential role in the pathogenesis of chronic myeloid leukemia. Recently, we have shown that BCR-ABL promotes PTEN nuclear exclusion, through the modulation of HAUSP activity.
OBJECTIVES: Here, we investigate HAUSP cellular compartmentalization in primary CML samples.
RESULTS: While in normal CD34 positive cells HAUSP is expressed mostly in the nucleus, in CML CD34 cells HAUSP is expressed both in the nuclear bodies and in the cytoplasm.
CONCLUSIONS: This observation suggests that HAUSP behaves as a shuttling protein in CML. It can bind to BCR-ABL in the cytosol, where it is phosphorylated on tyrosine residues, and it maintains the proper compartmentalization in the nuclear bodies, where it acts as part of a PML network to regulate PTEN de-ubiquitination.
OBJECTIVES: Here, we investigate HAUSP cellular compartmentalization in primary CML samples.
RESULTS: While in normal CD34 positive cells HAUSP is expressed mostly in the nucleus, in CML CD34 cells HAUSP is expressed both in the nuclear bodies and in the cytoplasm.
CONCLUSIONS: This observation suggests that HAUSP behaves as a shuttling protein in CML. It can bind to BCR-ABL in the cytosol, where it is phosphorylated on tyrosine residues, and it maintains the proper compartmentalization in the nuclear bodies, where it acts as part of a PML network to regulate PTEN de-ubiquitination.