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RUNX1 haploinsufficiency results in granulocyte colony-stimulating factor hypersensitivity

D W L Chin1, M Sakurai2, G S S Nah1

  • 1Cancer Science Institute of Singapore, National University of Singapore, Singapore.

Blood Cancer Journal
|January 9, 2016
PubMed

Insights

RUNX1 gene mutations predispose patients to myeloid malignancies by making blood stem cells hypersensitive to G-CSF. This leads to increased stem cell numbers and blocked differentiation, increasing leukemia risk.

Area of Science:

  • Hematology
  • Molecular Biology
  • Cancer Genetics

Background:

  • RUNX1/AML1 mutations are common in human leukemia.
  • Haploinsufficiency of RUNX1 causes familial platelet disorder with predisposition to myeloid malignancies (FPD/MM).
  • The molecular mechanisms underlying FPD/MM are not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanism by which RUNX1 haploinsufficiency predisposes individuals to myeloid malignancies.
  • To explore the role of G-CSF signaling in RUNX1-related hematopoietic disorders.

Main Methods:

  • Utilized murine Runx1(+/-) hematopoietic cells to study responses to G-CSF.
  • Analyzed STAT3 phosphorylation, Pias3 expression, and STAT3 sequestration by RUNX1.
  • Examined G-CSF hypersensitivity in blood cells from a FPD patient with a RUNX1 mutation.

Main Results:

  • Murine Runx1(+/-) hematopoietic cells showed hypersensitivity to G-CSF, resulting in increased stem/progenitor cell expansion and mobilization.
  • Runx1(+/-) cells exhibited enhanced STAT3 phosphorylation upon G-CSF stimulation, linked to reduced Pias3 expression and RUNX1-mediated STAT3 sequestration.
  • Blood cells from an FPD patient displayed similar G-CSF hypersensitivity, validating the findings in a human context.

Conclusions:

  • RUNX1 haploinsufficiency predisposes FPD patients to myeloid malignancies by altering G-CSF response.
  • This alteration involves expanding the stem/progenitor cell pool and blocking myeloid differentiation.
  • RUNX1 plays a critical role in regulating G-CSF signaling and maintaining hematopoietic homeostasis.

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