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Related Experiment Videos

Malignant conversion of chemically transformed normal human cells

G E Milo1, D Li, B C Casto

  • 1Department of Medical Biochemistry and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 28, 1996
PubMed
Summary

Chemicals like aflatoxin B1 transformed human cells, leading to tumor formation in mice. A specific 1.3-kb genetic element, identified on chromosome 7, drives this cancer-causing transformation.

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Area of Science:

  • Cell biology
  • Molecular oncology
  • Chemical carcinogenesis

Background:

  • Chemicals can induce cellular transformation, a key step in carcinogenesis.
  • Identifying specific genetic elements responsible for transformation is crucial for understanding cancer development.

Purpose of the Study:

  • To investigate the genetic basis of chemically induced cellular transformation.
  • To identify and characterize the genetic element responsible for inducing anchorage-independent growth and tumor formation in human cells.

Main Methods:

  • Human foreskin cells were chemically transformed using aflatoxin B1 and propane sultone.
  • Transfection with a cDNA library was performed on transformed cells.
  • Tumorigenicity was assessed by inoculating cells into nude mice.

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  • Genetic analysis included Southern blotting and reverse transcription PCR.
  • Chromosomal localization was determined using metaphase chromosome analysis.

    • Main Results:

    • Chemically transformed cells acquired anchorage-independent growth and altered epithelioid morphology.
    • Transfected cells formed progressively growing tumors (carcinomas) in nude mice.
    • A 1.3-kb genetic element, identical to CATR1.3, was identified, integrated, and transcribed.
    • This element was localized to chromosome 7q31-32.

    Conclusions:

    • A specific 1.3-kb genetic element (CATR1.3) on chromosome 7 is sufficient to induce malignant transformation of human cells.
    • This element plays a critical role in chemical carcinogenesis and tumor development.
    • Understanding this element offers potential targets for cancer therapy.