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      Intestinal barrier function :

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          An overview of the immune system.

          We are continually exposed to organisms that are inhaled, swallowed, or inhabit our skin and mucous membranes. Whether these organisms penetrate and cause disease is a result of both the pathogenicity of the organism (the virulence factors at its disposal) and the integrity of host defence mechanisms. The immune system is an interactive network of lymphoid organs, cells, humoral factors, and cytokines. The essential function of the immune system in host defence is best illustrated when it goes wrong; underactivity resulting in the severe infections and tumours of immunodeficiency, overactivity in allergic and autoimmune disease. In this review we have covered the normal function of the immune system in recognising, repelling, and eradicating pathogens and other foreign molecules.
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            Innate immune recognition: mechanisms and pathways.

            The innate immune system is an evolutionarily ancient form of host defense found in most multicellular organisms. Inducible responses of the innate immune system are triggered upon pathogen recognition by a set of pattern recognition receptors. These receptors recognize conserved molecular patterns shared by large groups of microorganisms. Recognition of these patterns allows the innate immune system not only to detect the presence of an infectious microbe, but also to determine the type of the infecting pathogen. Pattern recognition receptors activate conserved host defense signaling pathways that control the expression of a variety of immune response genes.
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              Oral bacteriotherapy as maintenance treatment in patients with chronic pouchitis: a double-blind, placebo-controlled trial.

              Pouchitis is the major long-term complication after ileal pouch-anal anastomosis for ulcerative colitis. Most patients have relapsing disease, and no maintenance treatment study has been performed. We evaluated the efficacy of a probiotic preparation (VSL#3) containing 5 x 10(11) per gram of viable lyophilized bacteria of 4 strains of lactobacilli, 3 strains of bifidobacteria, and 1 strain of Streptococcus salivarius subsp. thermophilus compared with placebo in maintenance of remission of chronic pouchitis. Forty patients in clinical and endoscopic remission were randomized to receive either VSL#3, 6 g/day, or an identical placebo for 9 months. Patients were assessed clinically every month and endoscopically and histologically every 2 months or in the case of a relapse. Fecal samples were collected for stool culture before and after antibiotic treatment and each month during maintenance treatment. Three patients (15%) in the VSL#3 group had relapses within the 9-month follow-up period, compared with 20 (100%) in the placebo group (P < 0.001). Fecal concentration of lactobacilli, bifidobacteria, and S. thermophilus increased significantly from baseline levels only in the VSL#3-treated group (P < 0.01). These results suggest that oral administration of this new probiotic preparation is effective in preventing flare-ups of chronic pouchitis.
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                Author and article information

                Journal
                Current Opinion in Clinical Nutrition and Metabolic Care
                Current Opinion in Clinical Nutrition and Metabolic Care
                Ovid Technologies (Wolters Kluwer Health)
                1363-1950
                2002
                November 2002
                : 5
                : 6
                : 685-694
                Article
                10.1097/00075197-200211000-00012
                12394645
                e10f3122-39bd-40e9-9944-1c8c3e906b05
                © 2002
                History

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