MAPK pathway activation selectively inhibits ASCL1-driven small cell lung cancer

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Updated: Oct 15, 2025

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Utilizing 18F-FDG PET/CT Imaging and Quantitative Histology to Measure Dynamic Changes in the Glucose Metabolism in Mouse Models of Lung Cancer

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Rebecca Caeser1, Christopher Hulton2, Emily Costa1,3

  • 1Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.

Iscience
|October 29, 2021
PubMed

Insights

Small cell lung cancer (SCLC), particularly the SCLC-A subtype, shows sensitivity to mitogen-activated protein kinase (MAPK) pathway activation. This activation induces cell-cycle arrest and senescence, revealing subtype-specific vulnerabilities.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Signaling

Background:

  • Mitogenic signaling pathways drive many solid tumors, including lung cancer.
  • While common in non-small cell lung cancer, MAPK pathway activity is paradoxically suppressed in small cell lung cancer (SCLC).

Purpose of the Study:

  • To investigate the role and interactions of the MAPK pathway in SCLC.
  • To identify subtype-specific vulnerabilities within SCLC signaling networks.

Main Methods:

  • Analysis of MAPK pathway interactions in SCLC subtypes.
  • In vitro and in vivo studies of MAPK activation in SCLC-A models.

Main Results:

  • The ASCL1-high SCLC-A subtype is selectively sensitive to MAPK pathway activation.
  • MAPK activation in SCLC-A induces cell-cycle arrest and senescence.
  • MAPK activation upregulates ERK negative feedback regulators and STAT signaling in SCLC-A.

Conclusions:

  • MAPK pathway activation presents a subtype-specific vulnerability in SCLC, particularly SCLC-A.
  • Understanding these complex signaling networks is crucial for developing targeted SCLC therapies.
Keywords:
Biological sciencesCell biologyMolecular biology

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