Th17 腸内皮質細胞への微生物の粘着による細胞誘導
Koji Atarashi1, Takeshi Tanoue2, Minoru Ando3
1RIKEN Center for Integrative Medical Sciences (IMS), 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan; Department of Microbiology and Immunology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
Cell
|September 29, 2015
まとめ
腸内皮質細胞に対する微生物の粘着は,Tヘルパー17 (Th17) 細胞を誘導する鍵です. この宿主特有の相互作用は腸内の免疫反応に影響します.
科学分野:
- 免疫学
- 微生物学
- 胃腸内科
背景:
- 腸内Tヘルパー17 (Th17) 細胞は宿主の防御に不可欠であり,特定の腸内微生物によって誘発されます.
- セグメント状細菌 (SFB) と特定の病原体は,Th17細胞の誘導体として知られています.
研究 の 目的:
- Th17細胞の誘導における腸内皮質細胞 (ECs) に対する微生物の粘着の役割を調査する.
- 微生物の粘着における宿主特異性が,Th17細胞誘導における宿主特異性と相関するかどうかを判断する.
主な方法:
- 宿主固有のSFB (M-SFBとR-SFB) を有する細菌のないマウスとラットの単体コロニー化.
- 粘着障害のある変異体を含むCitrobacter rodentiumとEscherichia coli O157を用いた感染モデル
- 微生物の植民と感染に対するTh17細胞誘導の分析.
主要な成果:
- SFBは小腸のECに宿主固有の結合を示し,宿主固有のTh17細胞誘導につながった.
- C. rodentiumとE. coli O157の粘着性欠陥のある変異体は,強固なTh17反応を誘導することができなかった.
- Th17細胞を誘発することが知られている,潰瘍性大腸炎患者から分離された20の細菌株の混合物も,EC粘着性特性を示した.
結論:
- 腸内皮質細胞への微生物の粘着は,Th17細胞誘導の重要な開始シグナルです.
- 宿主特異の粘着メカニズムは,宿主特異のTh17細胞応答の誘導の基礎にある可能性が高い.
- Th17細胞を強力に誘導する微生物の共通の特徴である.
関連する概念動画
Adherens Junctions
7.7K
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
Adherens Junctions are Dynamic
7.7K
T Cell Types and Functions
3.3K
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
3.3K
Renewal of Intestinal Stem Cells
3.6K
The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
3.6K
Defense Against Bacterial Pathogens
3.5K
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...
3.5K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.6K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.6K
Colonisation of Pathogens
35
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
35


