MICROBIOMA E IMMUNITA LORENZO EMMI
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1 MICROBIOMA E IMMUNITA LORENZO EMMI
2 Human Microbiome Project The Human Microbiome Project has characterized the microbial communities found at several different sites on the human body.
3 Human Microbiome Project
4 GASTROINTESTINAL TRACT NASAL ORAL MICROBIOME SKIN UROGENITAL TRACT RESPIRATORY TRACT
5 GUT MICROBIOME Human gastrointestinal tract is known to host trillions of microbs, the number of which reaches approximately cells in the entire gut of a healthy individual.
6 COMPOSITION OF GUT MICROBIOME ARCHAEA BACTERIA VIRUSES FUNGI
7 Functions of Microbiota-derived metabolites Microbiota-derived metabolites can have several functions: Anti-inflammatory activity Anti-oxidant activity Pain relief activity Regulation of gut barrier function Production of vitamins or energy sources. Modulation of immune system For example, butyrate, which is produced by bacterial fermentation of dietary fibres, can serve as energy source for colonocytes and can increase satiety.
8 Microbiome and Immune System
9 Homeostatic Immunity and the Microbiota, Yasmine Belkaid et al., Immunity Review, 2017
10 How does the immune system tolerate the microbiome?
11 Possible mechanisms Co-evolution ( contemporary development of IS and Microbiome) Tissue adaptation (plasticity of IS, mutualistic symbiosis ) Particular type of immune response at mucosal level ( prevalence of the immunoregulatory response)
12 Principal protagonists of the immune responses
13 Principal features of different T helper phenotypes Tissue cells
14 ILC1,2,3
15 Different types of TReg Treg Naturali (ntreg) Treg indotte (itreg) Oral antigens TGF-β di membrana TGF-β IL-10 Targets
16 Immune responses at intestinal mucosal level
17 Immunologia Cellulare e molecolare, Abul k. Abbas et al., ottava edizione, 2015.
18 Immunologia Cellulare e molecolare, Abul k. Abbas et al., ottava edizione, 2015.
19 Immunologia Cellulare e molecolare, Abul k. Abbas et al., ottava edizione, 2015.
20 Reciprocal interactions between microbiome and immune system Development, education and mantenaince of immune system Homeostasis, shaping and preservation of the function of microbiome
21 Reciprocal Interactions of the Intestinal Microbiota and Immune System, Craig L. Maynard et al., 2012, Nature Review
22 Reciprocal Interactions of the Intestinal Microbiota and Immune System, Craig L. Maynard et al., 2012, Nature Review
23 Reciprocal Interactions of the Intestinal Microbiota and Immune System, Craig L. Maynard et al., 2012, Nature Review
24 The gut microbiota-mediated development of the intestinal immune system. Role of the gut microbiota in immunity and inflammatory disease, Nobuhiko Kamada et al., 2013, Nature Reviews
25 The gut microbiota-mediated development of the intestinal immune system. Role of the gut microbiota in immunity and inflammatory disease, Nobuhiko Kamada et al., 2013, Nature Reviews
26 Direct and indirect resistance of the microbiota to colonization by enteric pathogens. Role of the gut microbiota in immunity and inflammatory disease, Nobuhiko Kamada et al., 2013, Nature Reviews
27 Cellular and Molecular Dynamics of Th17 Differentiation and its Developmental Plasticity in the intestinal immune Response, Suniti Bhaumik et al., Frontiers in Immunology,2017
28 AIM OF THE STUDY The aim of this study was to compare the GM structure and the profiles of SCFA production in BS patients and healthy control relatives eating the same diet and living in the same environment of BS patients. Here, we report that a peculiar dysbiosis of the gut microbial ecosystem is present in patients with BS, corresponding to specific changes in the profiles of SCFA production; in particular a significant decrease of butyrate production in Behçet's patients was demonstrated. Interestingly butyrate is able to induce T regulatory cell (Treg) differentiation via several mechanisms, thus influencing immune regulation probably promoting an abnormal immune system response
29 TAKE HOME MESSAGES BS is a vasculitis with muco-cutaneous, ocular and gastrointestinal involvement BS is associated to a peculiar dysbiosis of the gut microbial ecosystem Gut microbiota ecosystem in BS is characterized by a low biodiversity Behcet s patients were significantly depleted in the genera Roseburia and Subdoligranulum BS patients show a decrease of butyrate production The defect of butyrate production leads to reduced T-reg responses and activation of immuno-pathological T-effector responses
30 THANKS FOR YOUR ATTENTION
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