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An inducible melanoma model implicates a role for RAS in tumor maintenance and angiogenesis

A K Wong1, L Chin

  • 1Department of Adult Oncology, Dana-Farber Cancer Institute, MA, USA.

Cancer Metastasis Reviews
|February 24, 2001
PubMed

Insights

RAS signaling is crucial for melanoma maintenance and growth. Inhibiting RAS signaling in a mouse model led to tumor regression and apoptosis, highlighting its role in tumor angiogenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Tumor maintenance relies on complex host-tumor interactions, including angiogenesis.
  • The role of specific oncogenic mutations in established tumor maintenance is not fully understood.

Purpose of the Study:

  • To investigate the necessity of H-RASV12G expression for melanoma genesis and maintenance.
  • To explore the impact of H-RASV12G down-regulation on established melanoma and tumor angiogenesis.

Main Methods:

  • Development of a doxycycline-inducible H-RASV12G INK4a null mouse melanoma model.
  • Administration and withdrawal of doxycycline to control H-RASV12G expression.
  • Assessment of tumor regression, apoptosis, and angiogenesis.

Main Results:

  • Melanoma genesis and maintenance were strictly dependent on H-RASV12G expression.
  • Withdrawal of doxycycline and H-RASV12G down-regulation induced significant tumor regression.
  • Tumor regression was associated with increased apoptosis in tumor and endothelial cells.

Conclusions:

  • H-RASV12G is critical for both the initiation and maintenance of melanoma.
  • Targeting H-RASV12G can effectively lead to tumor regression and impact tumor angiogenesis.

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