Gain-of-function mutations in granulocyte colony–stimulating factor receptor (CSF3R) reveal distinct mechanisms of CSF3R activation

Haijiao Zhang, Cody Coblentz, Kevin Watanabe-Smith, Sophie Means, Jasmine Means, Julia Maxson, Jeffrey Tyner

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Granulocyte colony–stimulating factor (G-CSF or CSF3) and its receptor CSF3R regulate granulopoiesis, neutrophil function, and hematopoietic stem cell mobilization. Recent studies have uncovered an oncogenic role of mutations in the CSF3R gene in many hematologic malignancies. To find additional CSF3R mutations that give rise to cell transformation, we performed a cellular transformation assay in which murine interleukin 3 (IL-3)– dependent Ba/F3 cells were transduced with WT CSF3R plasmid and screened for spontaneous growth in the absence of IL-3. Any outgrowth clones were sequenced to identify CSF3R mutations with transformation capacity. We identified several novel mutations and determined that they transform cells via four distinct mechanisms: 1) cysteine- and disulfide bond–mediated dimerization (S581C); 2) polar, noncharged amino acid substitution at the transmembrane helix dimer interface at residue Thr-640; 3) increased internalization by a Glu-524 substitution that mimics a low G-CSF dose; and 4) hydrophobic amino acid substitutions in the membrane-proximal residues Thr-612, Thr-615, and Thr-618. Furthermore, the change in signaling activation was related to an altered CSF3R localization. We also found that CSF3R-induced STAT3 and ERK activations require CSF3R internalization, whereas STAT5 activation occurred at the cell surface. Cumulatively, we have expanded the regions of the CSF3R extracellular and transmembrane domains in which missense mutations exhibit leukemogenic capacity and have further elucidated the mechanistic underpinnings that underlie altered CSF3R expression, dimerization, and signaling activation.

Original languageEnglish (US)
Pages (from-to)7387-7396
Number of pages10
JournalJournal of Biological Chemistry
Volume293
Issue number19
DOIs
StatePublished - Jan 1 2018

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Granulocytes
Chemical activation
Mutation
Substitution reactions
Dimerization
Interleukin-3
Granulocyte Colony-Stimulating Factor
Amino Acid Substitution
Hematopoietic Stem Cell Mobilization
Amino Acids
Hematologic Neoplasms
Missense Mutation
Stem cells
Disulfides
Dimers
Cysteine
Assays
Neutrophils
Plasmids
Clone Cells

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Gain-of-function mutations in granulocyte colony–stimulating factor receptor (CSF3R) reveal distinct mechanisms of CSF3R activation. / Zhang, Haijiao; Coblentz, Cody; Watanabe-Smith, Kevin; Means, Sophie; Means, Jasmine; Maxson, Julia; Tyner, Jeffrey.

In: Journal of Biological Chemistry, Vol. 293, No. 19, 01.01.2018, p. 7387-7396.

Research output: Contribution to journalArticle

Zhang, Haijiao ; Coblentz, Cody ; Watanabe-Smith, Kevin ; Means, Sophie ; Means, Jasmine ; Maxson, Julia ; Tyner, Jeffrey. / Gain-of-function mutations in granulocyte colony–stimulating factor receptor (CSF3R) reveal distinct mechanisms of CSF3R activation. In: Journal of Biological Chemistry. 2018 ; Vol. 293, No. 19. pp. 7387-7396.
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