MDM2/P53 Levels in Bone Marrow Mesenchymal Stromal Cells Are Essential for Maintaining the Hematopoietic Niche in Response to DNA Damage

Authors

Rasoul Pourebrahim
Rafael Heinz Montoya
Zoe Alaniz
Lauren Ostermann
Patrick P Lin
Bin Liu
Edward Ayoub
Jared K Burks
Michael Andreeff

Publication Date

6-23-2023

Journal

Cell Death & Disease

Abstract

Mesenchymal stromal cells (MSCs) are a key component of the bone marrow (BM) niche, providing essential support required for the maintenance of hematopoietic stem cells. To advance our understanding of physiological functions of p53 and Mdm2 in BM-MSCs, we developed traceable conditional mouse models targeting Mdm2 and/or Trp53 in vivo. We demonstrate that Mdm2 is essential for the emergence, maintenance, and hematopoietic support of BM-MSCs. Mdm2 haploinsufficiency in BM-MSCs resulted in genotoxic stress-associated thrombocytopenia, suggesting a functional role for Mdm2 in hematopoiesis. In a syngeneic mouse model of acute myeloid leukemia (AML), Trp53 deletion in BM-MSCs improved survival, and protected BM against hematopoietic toxicity from a murine Mdm2i, DS-5272. The transcriptional changes were associated with dysregulation of glycolysis, gluconeogenesis, and Hif-1α in BM-MSCs. Our results reveal a physiologic function of Mdm2 in BM-MSC, identify a previously unknown role of p53 pathway in BM-MSC-mediated support in AML and expand our understanding of the mechanism of hematopoietic toxicity of MDM2is.

Keywords

Animals, Mice, Bone Marrow, Bone Marrow Cells, Disease Models, Animal, DNA Damage, Mesenchymal Stem Cells, Thrombocytopenia, Tumor Suppressor Protein p53, Proto-Oncogene Proteins c-mdm2

Comments

Supplementary Materials

PMID: 37353528