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  • Title: Age- and site-dependent cell cycle composition of the normal human colonic mucosa.
    Author: Sjöqvist U, Löfberg R, Ost A, Tribukait B.
    Journal: Anticancer Res; 2002; 22(6B):3437-41. PubMed ID: 12552936.
    Abstract:
    BACKGROUND AND AIM: As a reference to studies of DNA-ploidy and S- and G2/M-phase fractions in patients with inflammatory bowel diseases, we describe the mucosa of normal individuals with respect to age and localization in the colon. MATERIALS AND METHODS: One hundred and sixty-five biopsies from the right, transverse and left colon from 44 subjects (20 men, 24 females, median age 55 years (range 21-80)) who were referred for colonoscopy due to rectal bleeding, diarrhoea or suspicion of neoplasia, but with normal macroscopic and microscopic findings, were analysed by DNA-flow cytometry for ploidy and cell cycle composition. The biopsies were immediately fixed in buffered formalin and then analysed by a method for high quality preparations of cell nuclei without any centrifugation steps, resulting in minimal cell damage and low frequencies of aggregates, making the background levels low in the DNA-histograms. RESULTS: The median S-phase fraction of the biopsies, all diploid, was 2.35% (0.1-8.3). The S-phase fraction increased linearly with age (p = 0.001) and decreased from the right colon (median 2.75% (0.5-8.3)) over the transverse colon (median 2.3% (0.1-6.2)) to the left colon (median 1.9% (0.8-6.5), p < 0.02). The fraction of G2-cells (median 1.1%, range 0.2-5.1) increased significantly with increased S-phase fraction (p < 0.0001). CONCLUSION: DNA-FCM analyses of normal colonic tissue demonstrate an age- and site-dependent variation with regard to cell proliferation. This variation has to be taken into consideration when biopsy specimens from chronic colitis mucosa are evaluated.
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