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Effect of phytic acid on colonic epithelial cell proliferation
B K Nielsen1, L U Thompson, R P Bird
1Department of Nutritional Sciences, University of Toronto, Ontario, Canada.
Cancer Letters
|November 1, 1987
Summary
Phytic acid (PA) significantly reduced cell proliferation in rat descending colonic crypts. Higher PA concentrations (1.2% and 2.0%) lowered DNA synthesis and uppermost labeled cells, indicating an anti-proliferative effect.
Area of Science:
- Gastroenterology
- Nutritional Science
- Cell Biology
Background:
- Phytic acid (PA), found in plant seeds, is known to chelate minerals.
- Its effects on colonic cell proliferation require further investigation.
- Understanding PA's impact is crucial for dietary recommendations.
Purpose of the Study:
- To investigate the effects of varying dietary phytic acid concentrations on colonic crypt cell proliferation in rats.
- To determine if phytic acid influences cell proliferation differently across various regions of the colon.
Main Methods:
- Rats were fed diets containing 0%, 0.6%, 1.2%, or 2.0% phytic acid.
- Cell proliferation was assessed in descending, transverse, and ascending colonic crypts.
- Key metrics included crypt height, uppermost labeled cells, and labeling indices.
Main Results:
- Phytic acid significantly affected cell proliferation exclusively in the descending colon.
- No significant changes in colonic crypt height were observed across any groups.
- Dietary phytic acid at 1.2% and 2.0% led to significantly fewer uppermost labeled cells and reduced DNA synthetic cells (lower labeling indices).
Conclusions:
- Dietary phytic acid exhibits an anti-proliferative effect on cell proliferation in the rat descending colon.
- The anti-proliferative impact is dose-dependent, with higher concentrations showing greater effects.
- Phytic acid does not appear to alter colonic crypt height or affect proliferation in the transverse and ascending colon.