Cooperating, congenital neutropenia–associated Csf3r and Runx1 mutations activate pro-inflammatory signaling and inhibit myeloid differentiation of mouse HSPCs

Malte Ritter, Maksim Klimiankou, Olga Klimenkova, Axel Schambach, Dirk Hoffmann, Amy Schmidt, Lothar Kanz, Daniel C. Link, Karl Welte, Julia Skokowa

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Patients with the pre-leukemia bone marrow failure syndrome called severe congenital neutropenia (CN) have an approximately 15% risk of developing acute myeloid leukemia (AML; called here CN/AML). Most CN/AML patients co-acquire CSF3R and RUNX1 mutations, which play cooperative roles in the development of AML. To establish an in vitro model of leukemogenesis, we utilized bone marrow lin cells from transgenic C57BL/6-d715 Csf3r mice expressing a CN patient–mimicking truncated CSF3R mutation. We transduced these cells with vectors encoding RUNX1 wild type (WT) or RUNX1 mutant proteins carrying the R139G or R174L mutations. Cells transduced with these RUNX1 mutants showed diminished in vitro myeloid differentiation and elevated replating capacity, compared with those expressing WT RUNX1. mRNA expression analysis showed that cells transduced with the RUNX1 mutants exhibited hyperactivation of inflammatory signaling and innate immunity pathways, including IL-6, TLR, NF-kappaB, IFN, and TREM1 signaling. These data suggest that the expression of mutated RUNX1 in a CSF3R-mutated background may activate the pro-inflammatory cell state and inhibit myeloid differentiation.

Original languageEnglish
Pages (from-to)2329-2338
Number of pages10
JournalAnnals of Hematology
Volume99
Issue number10
DOIs
StatePublished - Oct 1 2020

Keywords

  • G-CSFR mutations
  • Pre-leukemia bone marrow failure syndrome
  • RUNX1 mutations
  • Severe congenital neutropenia

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