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Modification of pancreatic carcinogenesis in the hamster model. X. Effect of streptozotocin
Abstract:
An experiment was conducted to examine the possibility that the carcinogenic effect on the pancreas of streptozotocin (SZ) and N-nitrosobis(2-oxopropyl)amine (BOP) is based on similar mechanisms; groups of outbred Syrian golden hamsters were treated with SZ (single iv injection, 30 mg/kg body wt) alone, BOP alone (single sc injection, 10 mg/kg body wt), and SZ and BOP simultaneously. The experiment was terminated 52 weeks after treatment began. Of the hamsters treated with SZ alone, 44% developed islet cell tumors, most of which were of pleomorphic cell types. In addition, 40% of the hamsters developed pseudoductules and 12% developed ductular adenomas. The carcinogenicity of SZ for the exocrine pancreas was further indicated by induction of ductular carcinomas by SZ plus BOP, the incidence of which was significantly higher (P less than .0001) than that induced by BOP alone.
Insights
This study found that streptozotocin (SZ) causes pancreatic islet cell tumors in hamsters. Combined with N-nitrosobis(2-oxopropyl)amine (BOP), SZ also increased exocrine pancreatic cancer, suggesting shared carcinogenic mechanisms.
Area of Science:
- Oncology
- Toxicology
- Carcinogenesis
Background:
- The carcinogenic mechanisms of streptozotocin (SZ) and N-nitrosobis(2-oxopropyl)amine (BOP) in the pancreas are not fully understood.
- Investigating shared pathways could reveal novel therapeutic targets for pancreatic cancer.
Purpose of the Study:
- To investigate the potential for similar carcinogenic mechanisms between SZ and BOP in the hamster pancreas.
- To evaluate the individual and combined effects of SZ and BOP on pancreatic tumor development.
Main Methods:
- Outbred Syrian golden hamsters were administered single injections of SZ alone, BOP alone, or a combination of SZ and BOP.
- Tumor incidence and types were assessed 52 weeks post-treatment.
Main Results:
- SZ alone induced islet cell tumors in 44% of hamsters, with 40% developing pseudoductules and 12% ductular adenomas.
- The combination of SZ and BOP significantly increased the incidence of ductular carcinomas compared to BOP alone (P < .0001).
Conclusions:
- SZ exhibits carcinogenicity towards both the endocrine and exocrine pancreas.
- The findings suggest that SZ and BOP may share common carcinogenic pathways in pancreatic tissue.