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Calcium and colorectal epithelial cell proliferation in ulcerative colitis
R M Bostick1, M Boldt, M Darif
1Department of Public Health Sciences-Epidemiology, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina 27157, USA.
Summary
This pilot study found that daily calcium supplementation did not significantly alter colon cell proliferation in ulcerative colitis patients. Further research with larger sample sizes is needed to confirm calcium
Area of Science:
- Gastroenterology and Oncology
- Cell Biology and Cancer Prevention
Background:
- Altered colonic epithelial cell proliferation kinetics are observed in individuals at higher risk for colon cancer, including those with ulcerative colitis.
- Previous research indicated calcium supplementation may normalize cell proliferation distribution in sporadic adenoma patients.
Purpose of the Study:
- To investigate if calcium supplementation can modulate colonic epithelial cell proliferation kinetics in patients diagnosed with ulcerative colitis.
- To assess the effect of 2.0 g of daily calcium on the labeling index (LI) and cell distribution (phi(h)) in ulcerative colitis patients.
Main Methods:
- A pilot randomized, double-blind, placebo-controlled trial involving 31 ulcerative colitis patients.
- Participants received either placebo or 2.0 g of calcium daily for 2 months.
- Colorectal epithelial cell proliferation was assessed using immunohistochemical detection of proliferating cell nuclear antigen in rectal biopsies.
Main Results:
- Calcium supplementation showed a non-significant trend towards decreasing the labeling index (LI) and altering cell distribution (phi(h)) compared to placebo.
- The LI decreased by 0.5% more in the calcium group (P=0.91), and phi(h) decreased by 0.3% more (P=0.85), indicating minimal impact.
- High adherence (97%) and reliable biopsy scoring (r=0.89) support the study's findings.
Conclusions:
- This pilot study suggests that 2.0 g of daily calcium carbonate does not substantially normalize colon crypt cell proliferation rates or distribution in ulcerative colitis patients over 2 months.
- Larger sample sizes and modified study designs are required to definitively determine the efficacy of calcium supplementation for ulcerative colitis.