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Updated: Aug 1, 2025

Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
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Published on: January 7, 2019

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LIX1 Controls MAPK Signaling Reactivation and Contributes to GIST-T1 Cell Resistance to Imatinib

Salomé Ruiz-Demoulin1, Eva Trenquier1, Sanaa Dekkar1

  • 1Physiology and Experimental Medicine of the Heart and Muscles (PhyMedExp), University of Montpellier, INSERM, CNRS, 34295 Montpellier, France.

International Journal of Molecular Sciences
|April 28, 2023
PubMed

Insights

Limb Expression 1 (LIX1) protein is upregulated in gastrointestinal stromal tumor (GIST) cells treated with targeted therapies. Silencing LIX1 enhances anti-tumor effects by inhibiting resistance mechanisms.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Gastrointestinal stromal tumor (GIST) is the most common sarcoma, often driven by KIT mutations.
  • Targeted therapies like imatinib and sunitinib are effective but face resistance due to secondary mutations.
  • Understanding early adaptive responses to targeted therapy is crucial for overcoming resistance.

Purpose of the Study:

  • To investigate the role of LImb eXpression 1 (LIX1) in GIST cell adaptation to KIT inhibition.
  • To identify LIX1 as a potential therapeutic target for overcoming treatment resistance.

Main Methods:

  • Utilized GIST-T1 cell line.
  • Investigated LIX1 upregulation upon imatinib or sunitinib treatment.
  • Assessed the impact of LIX1 silencing on MAPK signaling reactivation and anti-tumor effects.

Main Results:

  • LIX1 expression is upregulated in GIST cells following treatment with imatinib or sunitinib.
  • Silencing LIX1 in GIST-T1 cells inhibited imatinib-induced MAPK signaling reactivation.
  • LIX1 knockdown enhanced the anti-tumor efficacy of imatinib.

Conclusions:

  • LIX1 is identified as a key regulator of the early adaptive response in GIST cells to targeted therapies.
  • LIX1 represents a potential therapeutic target to improve the efficacy of GIST treatments and overcome resistance.
Keywords:
LIX1 resistanceMAPKgastrointestinal tumorstyrosine kinase inhibitors

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