天生的免疫力和肠道微生物群在1型糖尿病发展中的作用
Li Wen1, Ruth E Ley, Pavel Yu Volchkov
1Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
Nature
|September 23, 2008
概括
天生的免疫系统天生的免疫系统.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 内分泌学 在内分泌学.
背景情况:
- 1型糖尿病 (T1D) 是一种自身免疫性疾病,其特征是破坏产生胰岛素的β细胞.
- 增加的T1D发病率表明环境因素,包括微生物群,影响病原发生.
- 非肥胖糖尿病 (NOD) 鼠标模型自发发展T1D,对环境微生物调制敏感.
研究的目的:
- 研究MyD88依赖的先天性免疫信号在T1D发展中的作用.
- 确定开始性肠道微生物群对NOD小鼠T1D病变的影响.
- 探索微生物干预措施在T1D预防方面的潜力.
主要方法:
- 使用了缺乏MyD88的NOD小鼠 (既没有特定的病原体,也没有细菌).
- 在不同的微生物环境中评估T1D发病率和进展.
- 使用16S rRNA测序分析了肠道微生物组成.
- 研究了微生物殖民和便微生物群移植的影响.
主要成果:
- 缺乏MyD88蛋白质的无特定病原体NOD小鼠没有发展T1D.
- 没有细菌的MyD88阴性NOD小鼠患上了糖尿病,这表明它们对共生微生物的依赖.
- 在没有细菌的NOD小鼠中,与定义的微生物联盟或来自MyD88缺乏的捐赠者的微生物群结合殖民减弱了T1D.
- MyD88缺乏改变了肠道微生物群的组成.
结论:
- 肠道微生物与通过MyD88的先天免疫系统之间的相互作用对T1D的发展至关重要.
- 综合性肠道微生物群作为影响T1D易感性的关键表观遗传因素.
- 准肠道微生物群和先天免疫路径可能为T1D提供新的治疗策略.
相关概念视频
Type I Diabetes I: Introduction
Type 1 diabetes mellitus is a chronic metabolic disorder characterized by an absolute deficiency of insulin resulting from the autoimmune destruction of pancreatic β-cells. Although it can occur at any age, it is most commonly diagnosed in childhood, adolescence, or early adulthood. The loss of insulin production impairs cellular glucose uptake, resulting in persistent hyperglycemia and necessitating lifelong insulin therapy.Autoimmune Destruction of β-CellsThe hallmark of type 1 diabetes is an...
Type I Diabetes II: Pathophysiology
Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
Anatomy of the Intestines
Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the small...
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the small...
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...
Type II Diabetes I: Introduction
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
Development of Human Microbiota
The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...

