Selenium from high selenium broccoli protects rats from colon cancer

Area of Science:

• Oncology
• Nutritional Science
• Biochemistry

Background:

• Colon cancer is a leading cause of cancer-related deaths in the US.
• Selenium (Se) supplementation has shown efficacy in colon cancer prevention.
• The chemical form of selenium influences its metabolism and potential health benefits.

Purpose of the Study:

• To investigate the efficacy of selenium from selenized broccoli for colon cancer prevention.
• To compare the effects of different forms and amounts of selenium on preneoplastic lesions.
• To understand the metabolic fate of selenium from selenized broccoli.

Main Methods:

• Two experiments using Fisher F-344 rats fed diets supplemented with varying forms and amounts of selenium (selenate, selenite, selenized broccoli).
• Rats were administered a chemical carcinogen to induce preneoplastic lesions (aberrant crypts and aberrant crypt foci).
• Incidence of aberrant crypts and aberrant crypt foci were quantified and compared across treatment groups.

Main Results:

• Supranutritional amounts of selenium supplied as high selenium broccoli significantly decreased the incidence of aberrant crypts and aberrant crypt foci.
• The reduction in preneoplastic lesions was attributed to selenium in high selenium broccoli, not broccoli or selenium alone.
• Selenium from high selenium broccoli did not accumulate in tissues or increase glutathione peroxidase activity as effectively as other forms.

Conclusions:

• Selenium provided by high selenium broccoli demonstrates significant protective effects against colon cancer precursors.
• The unique metabolism of selenium from selenized broccoli may contribute to its cancer-protective properties.
• Dietary selenium in the form of selenized broccoli offers a promising strategy for colon cancer prevention.