Suggestive evidence for the induction of colonic aberrant crypts in mice fed sodium nitrite
| Autor: | Lin Zhou, Karen L. Pennington, Sidney S. Mirvish, James L. Wisecarver, Muhammad Zahid, Samuel M. Cohen, Muhammad M. Anwar, Valerie Shostrom |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
Cancer Research medicine.medical_specialty Colorectal cancer Azoxymethane Medicine (miscellaneous) medicine.disease_cause 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Aberrant Crypt Foci Internal medicine medicine Animals Statistical analysis Processed meat Nitrite Sodium nitrite Nutrition and Dietetics Sodium Nitrite Chemistry medicine.disease 030104 developmental biology Endocrinology Oncology Biochemistry 030220 oncology & carcinogenesis Hemin Female Carcinogenesis Colorectal Neoplasms Aberrant crypt foci |
| Zdroj: | Nutrition and cancer. 68(1) |
| ISSN: | 1532-7914 |
| Popis: | A reported linkage between processed (nitrite-treated) meat products and the incidence of colon cancer could be due to sodium nitrite (NaNO2) itself or to N-nitroso compounds produced from the nitrite. Exposure to nitrite occurs due to residual nitrite in processed meat and to salivary nitrite arising by reduction of nitrate in vegetables and drinking water. Here we tested whether NaNO2 could induce colonic aberrant crypts (ABC) or ABC foci (ACF), which are putative precursors of colon cancer. We fed NaNO2 in drinking water for 20-25 wk to groups of 8-20 adult female mice. After sacrifice, ABC and ACF were counted in 2-cm distal colonic segments. In Experiment 1, no significant differences in ABC/ACF induction were seen between groups of 13-14 A/J mice fed 0, 0.5, or 1.0 g NaNO2/l drinking water. NaNO2 also did not affect fasting blood glucose levels. In Experiment 2, we fed 0, 1.0, 1.25, or 1.5 g NaNO2/l water to groups of 15 CF-1 mice. Five of the mice fed 1.5 g NaNO2/l showed ABC, whereas all other groups showed only 0-2 ABC/group, including 0 ABC for the group fed 1.25 g NaNO2/l. Overall statistical analysis indicated a dose-response p trends of 0.04. Pairwise comparison of ABC between groups fed 1.25 and 1.5 g NaNO2/l showed p 0.02 for both ABC and ACF, but a similar comparison between the untreated and 1.5 g/l groups showed no significant effects. In Experiment 3, hot dogs (18% of diet), which were fed to CF-1 mice previously treated with azoxymethane, inhibited ABC and ACF induction, but this effect was not significant (P = 0.10-0.12). In conclusion, these results support the view that NaNO2 may be a risk factor for colon carcinogenesis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|