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Effect of castration and testosterone replacement on pancreatic carcinogenesis in Syrian hamsters
C Sperti1, C Militello, A Perasole
1Clinica Chirurgica I, Università di Padova, Italy.
Abstract:
Hormonal manipulation has been proposed as a possible new approach to the treatment of pancreatic cancer. We studied the effect of orchiectomy and testosterone replacement on early stage pancreatic carcinogenesis induced by diisopropanolnitrosamine (DIPIN) in Syrian golden hamsters. Eighty-five hamsters (mean body weight, 100 g) were divided into the following treatment groups: 1) DIPN (n = 20); 2) DIPN plus orchiectomy (n = 17); 3) DIPN plus orchiectomy plus testosterone (n = 18); 4) orchiectomy (n = 10); 5) sham operation (n = 10); 6) DIPN plus testosterone (n = 10). DIPN (125 mg/kg/body wt.) was administered s.c. every week and testosterone propionate (10 micrograms/g) was administered s.c. every 3 weeks. Bilateral orchiectomy was performed 1 week after the first injection of DIPN. All animals were killed 15 weeks after starting the treatment. The whole pancreas was removed, weighted and histologically examined. There was no difference in the incidence of preneoplastic lesions among groups 1, 2, 3 and 6 (respectively 87%, 83%, 77% and 80%); 3 animals in each group developed invasive carcinoma. In control groups (4 and 5), no precancerous lesions were recorded. In this experimental model, orchiectomy and testosterone replacement had no effect on nitrosamine-induced pancreatic carcinogenesis.
Insights
Orchiectomy and testosterone replacement did not affect nitrosamine-induced pancreatic cancer development in hamsters. This study found no significant difference in preneoplastic lesions or invasive carcinoma incidence across treatment groups.
Area of Science:
- Oncology
- Endocrinology
- Carcinogenesis Research
Background:
- Pancreatic cancer remains a significant health challenge with limited treatment options.
- Hormonal manipulation, specifically involving androgens, has been explored as a potential therapeutic avenue.
- The role of testosterone in pancreatic carcinogenesis is not fully understood.
Purpose of the Study:
- To investigate the impact of orchiectomy and testosterone replacement on early-stage pancreatic carcinogenesis.
- To determine if hormonal manipulation influences the development of preneoplastic lesions and invasive carcinoma induced by diisopropanolnitrosamine (DIPIN).
Main Methods:
- Syrian golden hamsters were induced with pancreatic cancer using diisopropanolnitrosamine (DIPIN).
- Experimental groups included DIPIN exposure alone, DIPIN with orchiectomy, DIPIN with orchiectomy and testosterone replacement, and controls.
- Hormonal interventions (orchiectomy and testosterone propionate administration) were performed at specific time points.
- Pancreatic tissues were histologically examined after 15 weeks for preneoplastic lesions and invasive carcinoma.
Main Results:
- No significant differences in the incidence of preneoplastic lesions were observed between groups treated with DIPIN alone or in combination with hormonal manipulations (orchiectomy and/or testosterone).
- The rates of invasive carcinoma were similar across the DIPIN-treated groups, with three animals in each developing the condition.
- Control groups that did not receive DIPIN showed no precancerous lesions.
Conclusions:
- In this experimental model, orchiectomy and testosterone replacement did not demonstrate a significant effect on nitrosamine-induced pancreatic carcinogenesis.
- Further research is needed to elucidate the complex interplay between hormones and pancreatic cancer development.