NLRP6は,細菌の病原体に対する先天的免疫と宿主防御を否定的に調節する
Paras K Anand1, R K Subbarao Malireddi, John R Lukens
1Department of Immunology, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105, USA.
Nature
|July 6, 2012
まとめ
NLRP6は炎症シグナリングを否定的に調節し,マウスをListeriaやE. coliなどの細菌感染症に耐性化する. 欠乏すると,免疫細胞の活性化とサイトカインの生成が促進され,病原体のクリアランスに極めて重要です.
科学分野:
- 免疫学 免疫学とは
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
背景:
- NLRP6を含む,ヌクレオチド結合およびオリゴメリゼーション領域 (NOD) のような受容体 (NLR) 家族のメンバーは,先天的な免疫の重要な調節者です.
- 以前の研究では,NLRP6欠乏症と大腸炎や結腸直腸がんの感受性との関連が示されていたが,微生物感染症におけるNLRP6の役割は不明であった.
研究 の 目的:
- 細菌感染症におけるNLRP6の役割を調査し,それが調節する炎症シグナル伝達経路を特定する.
- NLRP6が,グラム陽性およびグラム陰性細菌の病原体に対する免疫応答にどのように影響を与えるかを決定する.
主な方法:
- Listeria monocytogenes,Salmonella typhimurium,およびEscherichia coli感染に対する耐性を評価するためにNlrp6欠乏したマウスを使用しました.
- 血液循環中の免疫細胞集団 (単細胞,中性細胞) と炎症シグナル伝達経路 (NF-κB,MAPK) を,Toll型受容体結合後にインビトロで分析した.
主要な成果:
- Nlrp6欠乏したマウスは,細菌感染に対する有意な耐性を示した.
- NLRP6の欠如により,循環中の単細胞と中性粒子が増加し,NF-κBとMAPK経路の活性化が強化されました.
- Nlrp6欠乏症は,NF-κBおよびMAPKに依存するサイトカインとキモカインの産生を増加させた.
結論:
- NLRP6は,炎症シグナル伝達経路の負の調節剤として作用する.
- NLRP6は,グラム陽性およびグラム陰性細菌病原体のクリアランスを阻害する上で重要な役割を果たします.
- NLRP6の機能を理解することで,細菌感染に対する宿主の防御機構の洞察が得られます.
関連する概念動画
Types of RNA
61.4K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
61.4K
NF-κB-dependent Signaling Pathway
7.7K
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...
NF-κB-dependent Signaling Mechanism
The...
7.7K
Inflammatory Response
12.6K
An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
12.6K
Defense Against Bacterial Pathogens
3.1K
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...
3.1K
Stringent Response in E. coli
533
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
533
Regulation of Bacterial Virulence
81
Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
81


