Related Experiment Videos
[Modifying effects of goitrogens on the tumor development in the liver and lung of rats]
Abstract:
In order to investigate whether goitrogens and liver enzyme-inducers modify the tumorigenesis in the liver or lung, 6-week old male F344 rats were given single subcutaneous injection of DHPN, and starting one week later received water containing goitrogens, namely sulfadimethoxine (SDM), propylthiouracil (PTU) and potassium thiocyanate (KSCN), or an enzyme-inducer, phenobarbital (PB), for 19 weeks ad libitum. Although the number of GST-P positive foci in the liver was significantly increased in the PB group as compared to the control group, there were no significant fluctuations in the SDM, PTU and PB groups. With respect to the lung, it is suggested that SDM, KSCN and PB may enhance the lung tumorigenesis, since the multiplicities of hyperplasias of alveolar epithelia were increased in groups treated with these compounds.
Insights
Goitrogens and liver enzyme-inducers were tested for their effects on rat liver and lung tumorigenesis. Phenobarbital increased liver pre-cancerous lesions, while sulfadimethoxine, potassium thiocyanate, and phenobarbital enhanced lung lesions.
Area of Science:
- Toxicology
- Carcinogenesis
- Pharmacology
Background:
- Certain chemicals, such as goitrogens and enzyme-inducers, are known to affect liver and lung health.
- Understanding their role in tumorigenesis is crucial for risk assessment.
Purpose of the Study:
- To investigate the potential of goitrogens (sulfadimethoxine, propylthiouracil, potassium thiocyanate) and a liver enzyme-inducer (phenobarbital) to modify liver and lung tumorigenesis.
- To assess the impact of these compounds on pre-neoplastic lesions in a rat model.
Main Methods:
- Male F344 rats were administered a single injection of DHPN to initiate tumorigenesis.
- Following the DHPN injection, rats received water containing either goitrogens or phenobarbital for 19 weeks.
- Liver and lung tissues were examined for pre-neoplastic lesions, including GST-P positive foci and alveolar epithelial hyperplasias.
Main Results:
- Phenobarbital significantly increased the number of GST-P positive foci in the liver compared to controls.
- No significant changes in liver pre-neoplastic lesions were observed in rats treated with sulfadimethoxine, propylthiouracil, or phenobarbital.
- Treatment with sulfadimethoxine, potassium thiocyanate, and phenobarbital led to increased multiplicities of alveolar epithelial hyperplasias in the lung.
Conclusions:
- Phenobarbital may promote liver tumorigenesis by increasing pre-neoplastic lesions.
- Sulfadimethoxine, potassium thiocyanate, and phenobarbital show potential to enhance lung tumorigenesis.
- Further research is needed to elucidate the mechanisms by which these compounds affect tumorigenesis in different organs.