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Updated: May 23, 2025

Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines
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Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines

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KSR2 Promotes Self-Renewal and Clonogenicity of Small Cell Lung Carcinoma

Dianna H Huisman1, Deepan Chatterjee1, Robert A Svoboda2

  • 1Eppley Institute, Fred & Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska.

Molecular Cancer Research : MCR
|March 10, 2025
PubMed

Insights

Kinase Suppressor of Ras 2 (KSR2) drives self-renewal and tumor initiation in small-cell lung cancer (SCLC) subtype-A. KSR2 is essential for tumor-propagating cell function and may be a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Small-cell lung carcinoma (SCLC) tumors exhibit heterogeneity with a subpopulation of tumor-initiating cells.
  • Kinase Suppressor of Ras 2 (KSR2) is a molecular scaffold involved in Raf/MEK/ERK signaling.
  • KSR2 expression is recognized in pulmonary neuroendocrine cells, a potential SCLC origin.

Purpose of the Study:

  • To investigate the role of KSR2 in promoting self-renewal and clonogenicity of SCLC cells.
  • To determine if KSR2 expression is a novel marker and driver in SCLC initiation.
  • To explore KSR2 as a potential subtype-specific therapeutic target in SCLC.

Main Methods:

  • Analysis of KSR2 expression in SCLC and pulmonary neuroendocrine cells (PNECs).
  • Depletion of KSR2 in SCLC-A cell lines to assess effects on tumor-propagating cells (TPCs).
  • In vitro colony formation assays and in vivo tumor initiation capacity assessments.

Main Results:

  • KSR2 is preferentially expressed in the ASCL1 subtype of SCLC (SCLC-A) and PNECs.
  • KSR2 depletion significantly inhibits the colony-forming ability of TPCs in vitro.
  • KSR2 disruption reduces the tumor-initiating capacity of SCLC-A cells in vivo.
  • The effects of KSR2 depletion are dependent on its interaction with ERK.

Conclusions:

  • KSR2 is a critical driver of SCLC-A tumor-propagating cell function and tumor initiation.
  • KSR2 expression in SCLC and PNECs offers a novel model for KSR2-dependent signaling.
  • KSR2 represents a potential subtype-specific therapeutic target for ASCL1-subtype SCLC.

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