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Upregulated heme biosynthesis, an exploitable vulnerability in MYCN-driven leukemogenesis.

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Increased heme biosynthesis is vital for leukemia development, particularly in MYCN-driven acute myeloid leukemia (AML). Disrupting porphyrin homeostasis, essential for leukemic cell survival, offers a potential therapeutic strategy for AML.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Heme biosynthesis is elevated in leukemia, but its role in leukemogenesis is unclear.
  • Heme is critical for oxygen metabolism and mitochondrial function.

Purpose of the Study:

  • Investigate the significance of heme biosynthesis in acute myeloid leukemia (AML).
  • Determine the role of MYCN expression in regulating heme biosynthesis and its impact on AML.
  • Explore porphyrin homeostasis as a therapeutic target in MYCN-driven AML.

Main Methods:

  • Analyzed gene expression of heme biosynthesis pathway in pediatric and adult AML samples.
  • Utilized murine hematopoietic progenitor cells (HPCs) overexpressing MYCN (MYCN-HPCs) to study heme biosynthesis requirements.
  • Assessed the impact of blocking heme biosynthesis and manipulating ABCG2 expression on leukemic progenitor self-renewal and survival.
  • Investigated the role of p53 in porphyrin toxicity and leukemogenesis.

Main Results:

  • Increased expression of heme biosynthetic genes, including UROD, correlates with high MYCN expression in pediatric AML.
  • High UROD and MYCN expression predicts poor survival in adult AML.
  • MYCN-HPCs require heme biosynthesis for self-renewal and oncogenic transformation, with increased oxygen consumption.
  • Blocking heme biosynthesis or porphyrin export (via ABCG2 deficiency) suppresses leukemic progenitor growth and improves survival in vivo.
  • p53 activation mediates porphyrin toxicity in leukemic cells, and its loss rescues cells from this toxicity.

Conclusions:

  • Heme biosynthesis and porphyrin homeostasis are crucial for MYCN-driven leukemogenesis.
  • Targeting heme biosynthesis or porphyrin transport presents a promising therapeutic avenue for AML, especially in cases with high MYCN expression.
  • The interplay between MYCN, heme, p53, and ABCG2 highlights a critical vulnerability in AML pathogenesis.