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A cDNA clone with anti-oncogene activity

D G Liu1, D Wang, Z Z Chen

  • 1Shanghai Institute of Biochemistry, Academia Sinica, PRC.

Science in China. Series B, Chemistry, Life Sciences & Earth Sciences
|July 1, 1992
PubMed

Insights

Researchers identified a cDNA clone, p14-6, exhibiting anti-oncogene activity against malignant cells. This clone, when introduced into cancer cells, induced reversion and reduced malignancy, suggesting potential therapeutic applications.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Therapy

Background:

  • Ras oncogenes are implicated in various cancers, driving cellular transformation and malignancy.
  • Identifying genes that counteract oncogenic activity is crucial for developing targeted cancer therapies.
  • The DT cell line, transformed by the v-Ki-Ras oncogene, serves as a model for studying anti-cancer interventions.

Purpose of the Study:

  • To identify and characterize cDNA clones with anti-oncogene activity against v-Ki-Ras-transformed cells.
  • To investigate the mechanism by which the identified clone suppresses malignant phenotypes.
  • To evaluate the therapeutic potential of the anti-oncogene clone in vitro and in vivo.

Main Methods:

  • Isolation of revertant cells (R14) from v-Ki-Ras-transformed DT cells using a human fibroblast cDNA library.
  • Transfection of DT cells with the isolated cDNA clone (p14-6) and selection of phenotypically reverted colonies.
  • In vitro and in vivo assays to assess the malignancy of p14-6-transfected cell lines (RR).
  • Molecular hybridization techniques to analyze the integration and structure of the p14-6 clone in the host genome.

Main Results:

  • A cDNA clone, designated p14-6, was isolated and demonstrated significant anti-oncogene activity.
  • Transfection of DT cells with p14-6 resulted in phenotypic reversion and reduced malignancy in 5-15% of colonies.
  • The p14-6-transfected cell line (RR) showed significantly reduced in vitro and in vivo malignancy.
  • Molecular analysis revealed tandem integration of p14-6 into the RR genome without altering the v-Ki-Ras oncogene.

Conclusions:

  • The cDNA clone p14-6 possesses potent anti-oncogene activity against v-Ki-Ras-transformed malignant cells.
  • The observed reversion and reduced malignancy suggest that p14-6 can suppress the oncogenic phenotype.
  • The anti-oncogene effect is likely mediated by the expression of the cDNA contained within the p14-6 clone.

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