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Related Experiment Videos

Signaling and drug sensitivity

R D Christen1, S Isonishi, J A Jones

  • 1Department of Medicine, University of California San Diego, La Jolla, CA 92093-0812.

Cancer Metastasis Reviews
|June 1, 1994
PubMed
Summary
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Cellular signaling pathways significantly enhance cancer cell sensitivity to chemotherapy drugs like cisplatin. Understanding these pathways, including those involving protein kinase C, offers new strategies for cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Receptor and nonreceptor kinases play roles in human cancer development.
  • Many cancer cell lines remain responsive to growth factors despite kinase alterations.

Purpose of the Study:

  • Investigate the hypothesis that cellular signaling events regulate cancer cell sensitivity to chemotherapeutic agents.
  • Identify specific signaling pathways that modulate drug sensitivity in cancer cells.

Main Methods:

  • Utilized human ovarian carcinoma cells (2008).
  • Activated various signal transduction pathways including those mediated by epidermal growth factor (EGF) receptor, tumor necrosis factor alpha (TNF alpha) receptor, bombesin receptor, protein kinase A (PKA), and protein kinase C (PKC).
  • Assessed changes in sensitivity to cisplatin.

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Main Results:

  • Activation of several signaling pathways led to a 2 to 4-fold increase in cisplatin sensitivity.
  • Phosphorylation of critical target proteins, such as beta-tubulin, is presumed to mediate enhanced drug sensitivity.
  • DNA damaging agents activate signaling cascades involving Src, Ras, and Raf proteins, inducing genes like c-fos, c-jun, and growth arrest and DNA damage-inducible (gadd) genes, with protein kinase C involvement and a protective function.

Conclusions:

  • Cellular signaling events are critical regulators of cancer cell sensitivity to chemotherapeutic agents.
  • Specific pathways and their substrates represent potential targets for modulating drug efficacy.
  • Understanding these relationships evolves new strategies for cancer therapy.