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Loss of p300 accelerates MDS-associated leukemogenesis.

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Deletion of p300, a protein lysine acetyltransferase, accelerates myeloid leukemia in mice, unlike CBP. Loss of p300 enhances hematopoietic stem cell self-renewal and promotes leukemogenesis, distinct from CBP's role.

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Area of Science:

  • Epigenetics and Cancer Biology
  • Hematopoiesis
  • Molecular Oncology

Background:

  • The roles of DNA methylation and histone modifications in human cancers are not fully understood.
  • p300 and CREB-binding protein (CBP) are homologous lysine acetyltransferases implicated as tumor suppressors due to mutations in various cancers.

Purpose of the Study:

  • To investigate the distinct roles of p300 and CBP in leukemogenesis using a mouse model.
  • To determine the impact of p300 deletion on hematopoietic stem and progenitor cell (HSPC) function and signaling pathways.

Main Methods:

  • Utilized Nup98-HoxD13 (NHD13) transgenic mice, an established model for myelodysplastic syndrome (MDS).
  • Assessed the effects of p300 deletion on leukemogenesis, HSPC self-renewal, apoptosis, and in vivo expansion.
  • Analyzed cytokine signaling pathways, including MAPK and JAK/STAT, in HSPCs following p300 loss.

Main Results:

  • Deletion of p300, but not CBP, significantly accelerated leukemogenesis in NHD13 transgenic mice.
  • p300 deletion enhanced HSPC self-renewal and in vivo expansion by increasing symmetric self-renewal divisions and reducing apoptosis.
  • Loss of p300 promoted cytokine signaling and activated MAPK and JAK/STAT pathways in HSPCs.

Conclusions:

  • p300 plays a critical role in preventing the progression of myelodysplastic syndrome (MDS) to acute myeloid leukemia.
  • The tumor-suppressive function of p300 in this context is distinct from that of CBP.
  • p300 acts as a key regulator of HSPC homeostasis and signaling, crucial for blocking myeloid leukemia development.