Immune response modulation in inflammatory bowel diseases by Helicobacter pylori infection  

作　　者：Gabriella Feilstrecker Balani Mariana dos Santos Cortez Jayme Euclydes Picasky da Silveira Freitas Fabrício Freire de Melo Ana Carla Zarpelon-Schutz Kádima Nayara Teixeira 

机构地区：[1]Campus Toledo,Universidade Federal do Paraná,Toledo 85.919-899,Paraná,Brazil [2]Campus Anísio Teixeira,Universidade Federal da Bahia,Instituto Multidisciplinar em Saúde,Vitória da Conquista 45.029-094,Bahia,Brazil [3]Programa de Pós-graduação em Biotecnologia-Setor Palotina,Universidade Federal do Paraná,Palotina 85.950-000,Paraná,Brazil [4]Programa Multicêntrico de Pós-graduação em Bioquímica e Biologia Molecular-Setor Palotina,Universidade Federal do Paraná,Palotina 85.950-000,Paraná,Brazil

出　　处：《World Journal of Gastroenterology》2023年第30期4604-4615,共12页世界胃肠病学杂志（英文版）

摘　　要：Many studies point to an association between Helicobacter pylori(H.pylori)infection and inflammatory bowel diseases(IBD).Although controversial,this association indicates that the presence of the bacterium somehow affects the course of IBD.It appears that H.pylori infection influences IBD through changes in the diversity of the gut microbiota,and hence in local chemical characteristics,and alteration in the pattern of gut immune response.The gut immune response appears to be modulated by H.pylori infection towards a less aggressive inflammatory response and the establishment of a targeted response to tissue repair.Therefore,a T helper 2(Th2)/macrophage M2 response is stimulated,while the Th1/macrophage M1 response is suppressed.The immunomodulation appears to be associated with intrinsic factors of the bacteria,such as virulence factors-such oncogenic protein cytotoxin-associated antigen A,proteins such H.pylori neutrophil-activating protein,but also with microenvironmental changes that favor permanence of H.pylori in the stomach.These changes include the increase of gastric mucosal pH by urease activity,and suppression of the stomach immune response promoted by evasion mechanisms of the bacterium.Furthermore,there is a causal relationship between H.pylori infection and components of the innate immunity such as the NLR family pyrin domain containing 3 inflammasome that directs IBD toward a better prognosis.

关 键 词：Cytotoxin-associated antigen A oncoprotein Gut microbiota Helicobacter pylori Helicobacter pylori neutrophilactivating protein Immunological modulation Inflammatory bowel disease NLR family pyrin domain containing 3 inflammasome 

分 类 号：R574[医药卫生—消化系统]