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<p>FMS-like tyrosine kinase 3–internal tandem duplication (FLT3/ITD) is a common driver mutation that presents with a high leukemic burden and its impact on metabolic homeostasis remains to be further investigated. Here, we revealed that the oncogenic activation of FLT3/ITD induced upregulation of target genes of sterol regulatory element-binding proteins (SREBPs) in vivo and in acute myeloid leukemia patients. Quizartinib is a second-generation FLT3 inhibitor that selectively inhibits the activating FLT3 mutations. We demonstrated the critical role of SREBP1 degradation in conferring the response of FLT3/ITD cells to quizartinib. Mechanistically, quizartinib facilitated degradation of the precursor form of SREBP1 via the FLT3/AKT/GSK3 axis and reduced protein levels of its target gene fatty acid synthase (FASN). Lipidomics analysis by Liquid Chromatography Mass Spectrometry (LC-MS) demonstrated that inhibition of FLT3 altered global levels of phospholipids including reduction of cardiolipin, leading to subsequent loss of mitochondrial membrane potential. Pharmacological inhibition of SREBP1 or FASN sensitized FLT3/ITD leukemia cells to quizartinib. Quizartinib combined with SREBP inhibitor fatostatin or FASN inhibitor orlistat provided substantial therapeutic benefit over monotherapies in the murine FLT3/ITD leukemia model. Our results indicated the mechanistic link between FLT3/ITD and SREBP degradation and suggested the combination therapy via targeting FLT3/SREBP/FASN axis.</p>

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Targeting oncogenic activation of FLT3/SREBP/FASN promotes the therapeutic effect of quizartinib involving disruption of mitochondrial phospholipids

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月22日

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  • Feng Yin,
  • Jing Yang,
  • Hao Luo,
  • Tiantian Yu,
  • Wenhua Lu,
  • Mingyue Zhao,
  • Hongli Du,
  • Shijun Wen,
  • Peng Huang,
  • Yumin Hu

摘要

FMS-like tyrosine kinase 3–internal tandem duplication (FLT3/ITD) is a common driver mutation that presents with a high leukemic burden and its impact on metabolic homeostasis remains to be further investigated. Here, we revealed that the oncogenic activation of FLT3/ITD induced upregulation of target genes of sterol regulatory element-binding proteins (SREBPs) in vivo and in acute myeloid leukemia patients. Quizartinib is a second-generation FLT3 inhibitor that selectively inhibits the activating FLT3 mutations. We demonstrated the critical role of SREBP1 degradation in conferring the response of FLT3/ITD cells to quizartinib. Mechanistically, quizartinib facilitated degradation of the precursor form of SREBP1 via the FLT3/AKT/GSK3 axis and reduced protein levels of its target gene fatty acid synthase (FASN). Lipidomics analysis by Liquid Chromatography Mass Spectrometry (LC-MS) demonstrated that inhibition of FLT3 altered global levels of phospholipids including reduction of cardiolipin, leading to subsequent loss of mitochondrial membrane potential. Pharmacological inhibition of SREBP1 or FASN sensitized FLT3/ITD leukemia cells to quizartinib. Quizartinib combined with SREBP inhibitor fatostatin or FASN inhibitor orlistat provided substantial therapeutic benefit over monotherapies in the murine FLT3/ITD leukemia model. Our results indicated the mechanistic link between FLT3/ITD and SREBP degradation and suggested the combination therapy via targeting FLT3/SREBP/FASN axis.