Decrease in size of azoxymethane induced colon carcinoma in F344 rats by 180-day fermented miso.

Area of Science:

• Gastroenterology
• Oncology
• Nutritional Science

Background:

• Colorectal cancer remains a significant health concern globally.
• Dietary factors play a crucial role in cancer development and prevention.
• Fermented foods, like miso, are explored for their potential health benefits.

Purpose of the Study:

• To investigate the chemopreventive effects of fermented miso on azoxymethane (AOM)-induced colon carcinogenesis in male F344 rats.
• To evaluate the impact of different fermentation durations of miso on colon tumor development.
• To assess specific biomarkers related to colon cancer progression and proliferation.

Main Methods:

• Male F344 rats were administered AOM to induce colon tumors.
• Rats were fed diets containing different durations of fermented miso (3-4 days, 180 days, 2 years) or a control diet.
• Tumor incidence, size, aberrant crypt foci (ACF), and biomarkers (beta-catenin, Cdx2, PCNA) were analyzed.

Main Results:

• Dietary 180-day fermented miso significantly reduced the size of adenocarcinomas compared to control and 2-year fermented miso groups.
• The 180-day fermented miso group showed a reduced proliferation index (PCNA) and germinal region.
• Tumor incidence rates varied, with 180-day fermented miso showing a 55% colon tumor rate, comparable to the control.

Conclusions:

• Dietary supplementation with 180-day fermented miso demonstrated chemopreventive properties against colon carcinogenesis in a rat model.
• Miso fermentation duration influences its potential anti-cancer effects.
• Further research is warranted to elucidate the mechanisms and confirm these findings in human studies.