Fas-associated phosphatase 1 (Fap1) influences βcatenin activity in myeloid progenitor cells expressing the bcr-abl oncogene

Weiqi Huang, Ling Bei, Elizabeth A. Eklund*

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Increased βcatenin activity correlates with leukemia stem cell expansion and disease progression in chronic myeloid leukemia (CML). We found previously that expression of the CML-related Bcr-abl oncoprotein in myeloid progenitor cells increases expression of Fas-associated phosphatase 1 (Fap1). This resulted in Fap1-dependent resistance to Fas-induced apoptosis in these cells. Fap1 also interacts with the adenomatous polyposis coli (Apc) protein, but the functional significance of this interaction is unknown. Apc participates in a complex that includes glycogen synthase kinase β (Gsk3β) and βcatenin. Assembly of this complex results in phosphorylation of βcatenin by Gsk3β, which facilitates βcatenin ubiquitination and degradation by the proteasome. In this study, we found increased association of Fap1 with the Apc complex in Bcr-abl+ myeloid progenitor cells. We also found Fap1-dependent inactivation of Gsk3β and consequent stabilization of βcatenin in these cells. Consistent with this, Bcr-abl+ cells exhibited a Fap1-dependent increase in βcatenin activity. Our studies identified Fap1-dependent Gsk3β inactivation as a molecular mechanism for increased βcatenin activity in CML.

Original languageEnglish (US)
Pages (from-to)12766-12776
Number of pages11
JournalJournal of Biological Chemistry
Volume288
Issue number18
DOIs
StatePublished - May 3 2013

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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