Dependence of the state of the large intestine parietal microflora on the activity of Helicobacter pylori associated chronic gastritis

Introduction. The aim of the study was to detect the dependence of the composition of the parietal microflora of the colon on the activity of Helicobacter pylori-associated chronic gastritis and the degree of Helicobacter pylori contamination of the gastric mucosa. Materials and methods. The study was carried out on 50 patients aged 24 to 72 years, who were diagnosed with HP-associated chronic gastritis in the phase of exacerbation based on the results of FEGDS and histological examination of biopsies of the mucous membrane of the antrum of the stomach in combination with a rapid urease test. A series of dilutions 10¹-10⁹ was prepared from a homogenized biopsy specimen of the mucous membrane of the sigmoid colon in 0.1 ml of isotonic sodium chloride solution, and 0.1 ml of a solution of the corresponding dilution was inoculated onto the surface of the nutrient medium. The study of mucosal microflora was carried out by means of bacteriological examination of biopsies of the mucous membrane of the sigmoid and cecum. The degree of H. pylori contamination of the gastric mucosa was assessed in the course of histological examination by a semi-quantitative method: low degree of contamination — up to 20 microbial bodies, average — 20-50 microbial bodies, strong — over 50 microbial bodies in the field of view. Results. The study demonstrated that the indicators of the average concentrations of bifidobacteria, lactobacilli and typical strains of E. coli progressively decreased with the transition to a higher degree of HP infection. This tendency was maximum in relation to bifidobacteria — 6.1-1.57-1.09 x 10⁸ CFU/g, with a difference between the maximum (I degree) and minimum (III degree) 5.59 times. A similar relationship, but much less pronounced, was observed for Lactobacterium spp. and E. coli. As the severity of HP infiltration of the gastric mucosa increases, there is a decrease in the concentration of the above microorganisms in the parietal mucin - the correlation coefficient is r = -0.74. Discussion. Since the mucous microflora is more stable and functionally significant than the cavity microflora, the data obtained allow us to consider Helicobacter pylori as an etiological factor of colonic dysbiosis. Conclusion. The probability of excessive growth of conditionally pathogenic fraction of intestinal parietal microflora has a direct dependence on the severity of Helicobacter pylori infestation, being maximum at degree III contamination. Content of bifidobacteria, lactobacilli and typical E. coli strains in the intestinal biotope of the large intestine is inversely related to the degree of histological activity of HP-associated gastritis.

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