Related Experiment Videos
Age dependent differences in human bile acid metabolism and 7 alpha-dehydroxylation
European Journal of Clinical Investigation
|December 1, 1981
Summary
Elderly individuals exhibit higher secondary bile acid transformation, potentially increasing colorectal cancer risk. This age-related difference is linked to altered bile acid metabolism, not transit time.
Area of Science:
- Gastroenterology
- Oncology
- Metabolic Research
Background:
- Secondary bile acids are implicated in colorectal cancer development.
- Age-dependent variations in colorectal cancer suggest underlying metabolic differences.
Purpose of the Study:
- To investigate age-related differences in cholic and deoxycholic acid metabolism.
- To explore the relationship between bile acid metabolism, gut transit time, and age.
Main Methods:
- Utilized a double isotope dilution method to study bile acid metabolism.
- Standardized food intake and measured gut transit time in young and elderly adults.
Main Results:
- Elderly subjects showed higher 7 alpha-dehydroxylation fractions and deoxycholic acid input rates.
- Fractional turnover rate of cholic acid was higher in the elderly group.
- Gut transit time correlated with deoxycholic acid input in younger adults only.
Conclusions:
- Age-related differences in bile acid metabolism, specifically increased colonic deoxycholic acid absorption in the elderly, may contribute to cancer risk.
- Altered ileal absorption of cholic acid in the elderly might also play a role.
- Diet and gut transit time do not appear to be the primary drivers of these observed metabolic differences.