腸道における先天性および適応性免疫のノード2依存的調節
Koichi S Kobayashi1, Mathias Chamaillard, Yasunori Ogura
1Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA.
Science (New York, N.Y.)
|February 5, 2005
まとめ
Nod2タンパク質は,細菌感染症に対する腸内免疫に不可欠です. ネズミのNod2欠乏は防御を弱め,クローン病の病原性におけるその役割を強調する.
科学分野:
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科について
- 微生物学 微生物学とは
背景:
- クローン病 (Crohn's disease,CD) で頻繁に変異するNod2タンパク質は,腸内での生理学的役割は不明である.
- Nod2の機能を理解することは,CDのメカニズムを解明するために不可欠です.
研究 の 目的:
- Nod2の腸内免疫と細菌防御における役割を調査する.
- 口腔細菌感染症に対する感受性に対するNod2欠乏の影響を決定する.
主な方法:
- 免疫反応を評価するために,Nod2欠乏したマウスを利用した.
- 経口,静脈,腹腔内経路でバクテリアを投与する.
- クリプトジンを含む腸内抗微生物ペプチドの定量表現.
主要な成果:
- Nod2欠乏したマウスは,バクテリアのムラミル二ペプチドに対する保護免疫を廃止した.
- これらのマウスは口腔細菌感染症に敏感でしたが,静脈内または腹腔内感染には敏感ではありませんでした.
- Nod2は腸内クリプトジンの発現に不可欠であることが判明しました.
結論:
- Nod2は,腸内における先天性免疫の重要な調節体である.
- バクテリアの成分をノード2によって認識することは,口腔防御に不可欠です.
- これらの発見は,Nod2変異とクローン病の感受性を結びつける潜在的なメカニズムを提供する.
関連する概念動画
02:26NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
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...
01:28Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
01:20Special Features of Adaptive Immunity
The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
01:20Inflammatory Bowel Disease II: Ulcerative Colitis
Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
01:25Inflammatory 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...