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Downregulating Notch counteracts Kras

Guangyao Kong1,2, Xiaona You3, Zhi Wen3

  • 1National Local Joint Engineering Research Center of Biodiagnostics and Biotherapy, The Second Affiliated Hospital of Xian Jiaotong University, Xian, China. konggy@xjtu.edu.cn.

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Notch signaling drives myeloproliferative neoplasms (MPNs) in Kras-mutant leukemia by promoting ERK activation and altered mitochondrial metabolism. Inhibiting Notch signaling blocks MPN development and reduces leukemia cell growth.

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Area of Science:

  • Hematology
  • Oncology
  • Molecular Biology

Background:

  • The Notch signaling pathway plays a complex role in cancer, with context-dependent functions.
  • While NOTCH1 mutations drive T-cell leukemia, Notch signaling loss is observed in myeloid leukemias.

Purpose of the Study:

  • To investigate the role of Notch signaling in oncogenic Kras-induced myeloproliferative neoplasm (MPN).
  • To identify therapeutic strategies targeting Notch signaling in Ras-driven myeloid leukemias.

Main Methods:

  • Utilized KrasG12D mouse models to study MPN development.
  • Manipulated Notch signaling using DNMAML expression and Pofut1 deletion in hematopoietic cells.
  • Analyzed ERK pathway activation, Dusp1 expression, and mitochondrial metabolism.
  • Tested combined inhibition of MEK/ERK and mitochondrial respiration in leukemia cells.

Main Results:

  • Downregulation of Notch signaling significantly inhibited MPN development in a cell-autonomous manner.
  • Notch inhibition upregulated Dusp1, reducing ERK activation and reprogramming mitochondrial metabolism.
  • Combined MEK/ERK pathway inhibition and mitochondrial oxidative phosphorylation blockade reduced leukemia cell growth.

Conclusions:

  • Notch signaling has a novel oncogenic function in Kras-driven MPN.
  • Targeting both ERK signaling and mitochondrial metabolism offers a promising therapeutic strategy for Ras-driven myeloid leukemias.