Phosphoproteome analyses reveal specific implications of Hcls1, p21-activated kinase 1 and Ezrin in proliferation of a myeloid progenitor cell line downstream of wild-type and ITD mutant Fms-like tyrosine kinase 3 receptors

J Proteomics. 2013 Jan 14;78:231-44. doi: 10.1016/j.jprot.2012.09.009. Epub 2012 Sep 24.


The tyrosine kinase receptor Flt3 (Fms-like tyrosine kinase 3) is almost always expressed in AML (acute myeloid leukemia) cells, and constitutive activation of Flt3 by ITD (internal tandem duplication) mutations is one of the most common molecular alterations known in AML, especially monocytic AML. Furthermore, Flt3-ligand (FL) was shown as an in vitro growth factor for monocytic precursors, pointing to the important role of Flt3 in the regulation of monocyte/macrophage production. To get a relevant model for studying the molecular mechanisms underlying the physiopathological role of Flt3 on monocytic lineage development, we used the IL-3 dependent murine myeloid progenitors FDC-P1 cell line to generate cells stably co-expressing murine Fms (M-CSF receptor) and human Flt3. Wild type (WT)-Flt3 expressing cells could proliferate in an FL-dependent manner, whereas those expressing Flt3-ITD all survived IL-3 deprivation and showed autonomous proliferation, whereas both types of cells could differentiate to monocytic cells in response to M-CSF. Next, by combining phosphoprotein detection or purification, comparative 2D-PAGE and mass spectrometry sequencing, we sought for downstream mediators of Flt3-WT or Flt3-ITD in FD/Fms cell proliferation. Amongst the differentially expressed and/or phosphorylated proteins, 3 showed a specific implication in FD/Fms cell proliferation: Hcls1 and the Pak1/2 in FL-dependent proliferation of Flt3-WT expressing cells and Ezrin in autonomous proliferation of Flt3-ITD expressing cells.

MeSH terms

  • Adaptor Proteins, Signal Transducing / genetics
  • Adaptor Proteins, Signal Transducing / metabolism*
  • Animals
  • Blood Proteins / genetics
  • Blood Proteins / metabolism*
  • Cell Line
  • Cell Proliferation*
  • Cytoskeletal Proteins / genetics
  • Cytoskeletal Proteins / metabolism*
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / metabolism*
  • Gene Expression Regulation, Leukemic / genetics
  • Humans
  • Interleukin-3 / genetics
  • Interleukin-3 / metabolism
  • Leukemia, Myeloid, Acute / genetics
  • Leukemia, Myeloid, Acute / metabolism*
  • Leukemia, Myeloid, Acute / pathology
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism
  • Mice
  • Mutation
  • Myeloid Progenitor Cells / metabolism*
  • Myeloid Progenitor Cells / pathology
  • Neoplastic Stem Cells / metabolism*
  • Neoplastic Stem Cells / pathology
  • Phosphoproteins / genetics
  • Phosphoproteins / metabolism*
  • Proteome / genetics
  • Proteome / metabolism*
  • Repetitive Sequences, Nucleic Acid
  • fms-Like Tyrosine Kinase 3 / genetics
  • fms-Like Tyrosine Kinase 3 / metabolism*
  • p21-Activated Kinases / genetics
  • p21-Activated Kinases / metabolism*


  • Adaptor Proteins, Signal Transducing
  • Blood Proteins
  • Cytoskeletal Proteins
  • DNA-Binding Proteins
  • HCLS1 protein, human
  • Hcls1 protein, mouse
  • IL3 protein, human
  • Interleukin-3
  • Membrane Proteins
  • Phosphoproteins
  • Proteome
  • ezrin
  • flt3 ligand protein
  • FLT3 protein, human
  • Flt3 protein, mouse
  • fms-Like Tyrosine Kinase 3
  • PAK1 protein, human
  • Pak1 protein, mouse
  • p21-Activated Kinases