细菌因提明在结肠增生和炎症中的作用
L M Higgins1, G Frankel, I Connerton
1Department of Paediatric Gastroenterology, St. Bartholomews and the Royal London School of Medicine and Dentistry, London EC1A 7BE, UK.
概括
肠病原性大肠杆菌 (Escherichia coli) 和虫菌 (Citrobacter rodentium) 使用内胺蛋白粘附于肠道细胞. 这种相互作用会触发免疫反应和炎症,促进结肠中的细菌殖民.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
背景情况:
- 肠病原性大肠杆菌 (EPEC) 使用因蒂明α通过转位的因蒂明受体结合宿主细胞.
- 一种结肠病原体Citrobacter rodentium,在类似的粘附机制中采用了因提明β.
研究的目的:
- 在细菌殖民和宿主免疫反应的背景下,研究胺α和胺β的免疫调节作用.
- 确定因丁胺介导免疫病理对肠道微生物增殖的特定贡献.
主要方法:
- 对活体和死体细菌菌株 (EPEC,C. rodentium,E. coli K12) 的宿主反应的比较分析,具有不同的亲密表达.
- 在体外评估因提明对T细胞受体信号传递的共刺激活性.
- 在体内研究评估粘膜层增生和免疫细胞透在老鼠结肠.
- 对C. rodentium诱导的粘膜变化的干扰素-玛依赖性测定.
主要成果:
- 通过各自的内因素,EPEC和C. rodentium都诱导了显著的粘膜增生和结肠中强大的T辅助细胞1型免疫反应.
- 亲密素的一种特定突变 (Cys937Ala) 显著降低了其共刺激能力,并废除了体内免疫病理学.
- 干扰素-马信号传递对由C. rodentium引起的粘膜变化的发展至关重要.
- 已经证明,因丁胺诱导的免疫病理学会为增加细菌殖民创造一个更有利的环境.
结论:
- 细菌的亲密蛋白质在调节宿主免疫反应中起着至关重要的作用,导致免疫病理,有利于微生物殖民.
- 准亲密介导信号通路可能是控制肠道细菌感染的新治疗策略.
相关概念视频
Chronic Bowel Disorders: Introduction
Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
Bacterial Flora of the Large Intestine
The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
Inflammatory Bowel Disease II: Crohn's Disease
Introduction
Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
Crohn's disease
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by transmural...
Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
Crohn's disease
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by transmural...
Probiotics
Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...
Microbiota Modulation by Antibiotics
Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
Inflammatory Bowel Disease III: Crohn's Disease
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...


