シンビオティック細菌の免疫調節分子は,宿主の免疫系の成熟を指揮する
Sarkis K Mazmanian1, Cui Hua Liu, Arthur O Tzianabos
1Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. smazmanian@rics.bwh.harvard.edu
Cell
|July 13, 2005
まとめ
腸内細菌のBacteroides fragilisは,免疫システムの発達を導くために多糖質 (PSA) を使用しています. このバクテリア分子は,免疫不全を修正し,動物の健康的な免疫システムの成熟を促進します.
科学分野:
- マイクロバイオームの研究
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科
背景:
- 哺乳類の腸は,宿主の免疫システムとバランスの取れた複雑な細菌生態系を宿している.
- この宿主-細菌共生の基礎となる分子機構は完全に理解されていません.
- 共生的な恩恵を媒介する細菌分子を特定することは,腸の健康を理解するために不可欠です.
研究 の 目的:
- 宿主-細菌共生を媒介するバクテロイドス・フレジリスの細菌分子を特定する.
- 免疫システムの発達における細菌の多糖質 (PSA) の役割を調査する.
- 腸内微生物群の影響による免疫系成熟の分子基礎を解明する.
主な方法:
- バクテロイド・フレジリスとPSA変異株による動物のコロニー化.
- 植民された動物と細菌のない動物における免疫システムの発達を比較する.
- T細胞集団,サイトカイン生産,リンパ性臓器生成の分析.
主要な成果:
- バクテロイドス・フレジリス・ポリサッカリド (PSA) は,発達中の免疫系の細胞および身体的成熟を指揮する.
- PSAは,全身のT細胞欠陥とT (H) 1 / T (H) 2の不均衡を修正する.
- B. fragilisのPSA欠乏型変異体は,これらの免疫機能の回復に失敗し,PSAの重要な役割を強調した.
- dendritic 細胞によって提示される PSA は CD4+ T 細胞を活性化し,サイトカインの生産を促進します.
結論:
- Bacteroides fragilisのバクテリアポリサッカリド (PSA) は,宿主-バクテリア共生を媒介する重要な分子です.
- PSAは哺乳類の免疫系の発達と成熟に重要な役割を果たします.
- これらの発見は,共生細菌が宿主の免疫をどのように形作るかについての分子的な説明を提供します.
関連する概念動画
Cell-mediated Immune Responses
Overview
B Cell Activation and Differentiation
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Defense Against Bacterial Pathogens
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Functions of the Gut Microbiota
The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
Gut-Brain Axis
The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...
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...


