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Published on: July 28, 2010
Colonic mucosal proliferation is related to serum deoxycholic acid levels
T Ochsenkühn1, E Bayerdörffer, A Meining
1Department of Medicine II, Klinikum Grosshadern, University of Munich, Germany.
Background:
Hyperproliferation of the colorectal mucosa is regarded as an early step in colorectal carcinogenesis. Deoxycholic acid, a secondary bile acid, stimulates colorectal epithelial proliferation in animals and is considered a tumor promoter in human colorectal carcinogenesis. The aim of this study was to investigate the correlation between colorectal mucosal proliferation and the serum deoxycholic acid level.
Methods:
From each of 19 patients (10 men and 9 women) with (n = 3) or without (n = 16) colorectal adenoma, 18 biopsy specimens were obtained by colonoscopy, 3 from each of the 6 colonic segments. A crude nuclei fraction was prepared, and DNA was stained by propidium iodide to determine the proliferative index (the percentage of cells in the S and G2/M phases of the cell cycle) by flow cytometry. Serum levels of deoxycholic acid were determined by gas-liquid chromatography.
Results:
The colonic proliferation rates (median of the values obtained in all segments, 14.1%; range, 10.0-18.7%) and the fasting serum deoxycholic acid levels (median, 0.86 micromol/L; range, 0.28-1.58 micromol/L) showed a significant correlation (r = 0.51, P = 0.03). Serum lithocholic, cholic, chenodeoxycholic, and ursodeoxycholic acid levels were not correlated with the proliferation rates.
Conclusions:
Levels of deoxycholic acid in serum are correlated with the rates of the colorectal mucosa. These results are consistent with the concept that deoxycholic acid promotes colorectal carcinogenesis.
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