カエンフェロルは,LPS/ LTA誘発の炎症と細胞ストレスを弱めることで,TLR-2とTLR-4の共活性化を抑制する
Muhammad Haroon1, Sun Chul Kang2
1Department of Biotechnology, Daegu University, Gyeongsan, 38453, Republic of Korea.
Molecular biology reports
|September 5, 2025
まとめ
カエンフェロルは,TLR- 2とTLR- 4のシグナル伝達経路を調節することによって,細菌による毒素誘発の炎症から保護します. この天然のフラボノイドは皮膚細胞の細胞毒性および炎症マーカーを減少させ,全身の炎症モデルを作ります.
科学分野:
- 皮膚科
- 免疫学
- 薬理学について
背景:
- LPSやLTAのような細菌の病原体関連分子パターン (PAMPs) は,ケラチノ細胞のTLR-4とTLR-2経路を活性化し,炎症や損傷を引き起こす.
- これらの経路はアトピー性皮膚炎や慢性創傷などの炎症性皮膚疾患を悪化させる.
研究 の 目的:
- LPS + LTA誘発の炎症と細胞毒性に対するカエンフェロルの保護効果を調査する.
- HaCaTケラチノサイトとマウンの全身性炎症モデルにおけるカエンフェロールの作用の根本的なメカニズムを解明する.
主な方法:
- In vitro: LPS/LTAへの暴露前にカエンフェロールで治療されたHaCaT細胞; 評価された生存能力,アポトーシス,サイトカイン,mRNA,およびタンパク質発現.
- 生体内:LPS/LTA発症前にカエンフェロールを口服したBALB/cマウス;炎症マーカー,組織病理学,タンパク質発現を評価した.
主要な成果:
- カエンフェロルは,アポトーシスと炎症誘発性サイトカイン (IL-6,IL-1β,TNF-α) を有意に減少させた.
- TLR- 2とTLR- 4の発現を抑制し,肝炎とコラーゲンの堆積を減少させ,NF- kBとMAPKのリン酸化を抑制した.
- カエンフェロルはMyD88依存のシグナル伝達を妨害し,ROSを低下させ,IRF3活動を抑制した.
結論:
- カエンフェロルは,TLR-2/TLR-4の交響を調節し,皮膚細胞における細菌毒素誘発の炎症を和らげる.
- その二重のTLR抗作用と細胞保護効果は,TLR媒介の皮膚疾患に対する潜在的な治療戦略を提供します.
さらに関連する動画
09:51Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
Published on: July 26, 2017
12.5K
11:48Isolation Protocol of Mouse Monocyte-derived Dendritic Cells and Their Subsequent In Vitro Activation with Tumor Immune Complexes
Published on: May 31, 2018
11.6K
関連する概念動画
Inflammatory Response
6.9K
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,...
6.9K
T Cell Types and Functions
1.4K
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...
1.4K
Regulation of the Unfolded Protein Response
2.6K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.6K
Other Stress Responses in Bacteria
62
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
62
NF-κB-dependent Signaling Pathway
7.8K
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...
7.8K
Stringent Response in E. coli
50
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...
50
