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Potential identification of chemical carcinogens in a viral transformation system
Abstract:
Chemical carcinogens from several diverse chemical classes i.e.; aromatic amines, polycyclic hydrocarbons, nitrosamines, hormonal derivatives, metals and direct alkylating agents cause a 6.2-60.5-fold increase in the frequency of murine sarcoma virus (MSV)-induced transformation in a normal rat kidney (NRK) cell system. Exogenous metabolic activation with a rat liver S-9 homogenate is required for expression of this activity by procarcinogens. Non-carcinogenic analogs of these compounds fail to cause significant increases in the transformation frequency either with or without prior metabolic activation. Iododeoxyuridine, a mutagen also does not cause enhancement of transformation. This system may serve as the basis for a rapid and quantifiable means of identifying chemical carcinogens while introducing a new model for the understanding of the interactions between oncornaviruses and chemical carcinogens.
Insights
Chemical carcinogens significantly increase virus-induced cell transformation in a rat kidney cell model. This system aids in identifying carcinogens and understanding their interaction with oncornaviruses.
Area of Science:
- Oncology
- Virology
- Toxicology
Background:
- Chemicals are known to cause cancer through various mechanisms.
- Understanding the interaction between chemical carcinogens and viruses is crucial for cancer research.
Purpose of the Study:
- To establish a rapid and quantifiable cell system for identifying chemical carcinogens.
- To investigate the enhancing effect of chemical carcinogens on virus-induced cell transformation.
- To explore the interaction between oncornaviruses and chemical carcinogens.
Main Methods:
- Utilized a normal rat kidney (NRK) cell system.
- Induced cell transformation using murine sarcoma virus (MSV).
- Assessed the effect of various chemical classes (aromatic amines, polycyclic hydrocarbons, nitrosamines, etc.) on transformation frequency.
- Employed exogenous metabolic activation with rat liver S-9 homogenate for procarcinogens.
Main Results:
- Chemical carcinogens increased MSV-induced NRK cell transformation by 6.2-60.5 fold.
- Metabolic activation was necessary for procarcinogens to exhibit enhancing activity.
- Non-carcinogenic analogs and a mutagen (iododeoxyuridine) did not enhance transformation.
- The NRK cell system demonstrated a dose-dependent response to chemical carcinogens.
Conclusions:
- The NRK cell system provides a sensitive and quantifiable method for detecting chemical carcinogens.
- This model offers new insights into the mechanisms by which chemical carcinogens interact with oncornaviruses.
- The findings support the use of this system for carcinogen screening and mechanistic studies.