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Lorenzo Brunetti1, Michael C Gundry2, Daniele Sorcini3

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Acute myeloid leukemia (AML) cells with mutated NPM1 depend on the abnormal cytoplasmic NPM1 protein (NPM1c). Inhibiting its export causes AML cell differentiation and improves survival in mice.

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Area of Science:

  • Molecular biology
  • Hematology
  • Oncology

Background:

  • Nuclear factor NPM1 is the most frequently mutated gene in cytogenetically normal acute myeloid leukemia (AML).
  • NPM1 mutations lead to abnormal cytoplasmic localization of the NPM1 protein (NPM1c) in AML cells.
  • The role of NPM1c in maintaining the leukemic state is currently unknown.

Purpose of the Study:

  • To investigate whether NPM1c is essential for maintaining the leukemic phenotype in NPM1-mutated AML.
  • To explore the therapeutic potential of targeting NPM1c localization in AML treatment.

Main Methods:

  • Studied the effects of NPM1c loss from the cytoplasm via nuclear relocalization or targeted degradation.
  • Investigated the impact of XPO1 inhibition on NPM1c localization and AML cell behavior.
  • Assessed AML cell differentiation and survival in Npm1-mutated mouse models.

Main Results:

  • Loss of cytoplasmic NPM1c triggers immediate downregulation of homeobox (HOX) genes, leading to AML cell differentiation.
  • XPO1 inhibition effectively relocalizes NPM1c to the nucleus, promoting AML cell differentiation.
  • Treatment with XPO1 inhibitors prolonged the survival of leukemic mice with Npm1 mutations.

Conclusions:

  • NPM1-mutated AML cells exhibit a critical dependency on the cytoplasmic localization of NPM1c.
  • Targeting NPM1c nuclear export represents a promising therapeutic strategy for AML with NPM1 mutations.
  • Nuclear export inhibitors offer a rationale for treating NPM1-mutated AML.