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Isolation and Characterization of Neutrophils with Anti-Tumor Properties
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A myeloid tumor suppressor role for NOL3

Robert F Stanley1, Richard T Piszczatowski1, Boris Bartholdy1

  • 1Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461.

The Journal of Experimental Medicine
|February 25, 2017
PubMed

Insights

Deletion of Nucleolar protein 3 (Nol3) in mice causes myeloproliferative neoplasms (MPN) similar to primary myelofibrosis (PMF). This study identifies Nol3 as a tumor suppressor in myeloid malignancies.

Area of Science:

  • Hematology
  • Molecular Biology
  • Oncology

Background:

  • Myeloproliferative neoplasms (MPN) pathogenesis is not fully understood despite known JAK-STAT pathway mutations.
  • Recent research highlights molecular aberrations in MPN initiation and progression.

Purpose of the Study:

  • To investigate the role of Nucleolar protein 3 (Nol3) in MPN development.
  • To establish a novel genetic mouse model for primary myelofibrosis (PMF).

Main Methods:

  • Generated a mouse model with Nol3 deletion (Nol3-/-) to study MPN.
  • Analyzed stem cell populations (Thy1+LSK) for cell cycling and differentiation.
  • Assessed JAK-STAT pathway activation and downstream targets (Cdk6, Myc).
  • Compared molecular profiles of mouse MPN cells with human PMF patient samples.

Main Results:

  • Nol3 deletion in mice induced an MPN resembling PMF.
  • Nol3-/- mice exhibited expanded Thy1+LSK stem cells with increased cycling and myelomonocytic bias.
  • Phenotype was driven by Nol3-/- induced JAK-STAT activation, leading to Cdk6 and Myc upregulation.
  • Nol3 MPN cells showed molecular similarities to human PMF CD34+ cells.
  • Decreased NOL3 levels and locus deletion were observed in PMF patients.

Conclusions:

  • Nol3 deletion drives a PMF-like MPN through JAK-STAT pathway activation.
  • Nol3 acts as a tumor suppressor in myeloid malignancies.
  • Identified a novel genetic mouse model for PMF research and revealed Nol3's role in disease pathogenesis.

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