酸化ストレスは,イカッパ・バルファの劣化なしにNF-kappaB核転位を誘導する
1Department of Surgery, University of Washington, Seattle 98104-2924, USA.
Circulation
|November 24, 1999
まとめ
酸化ストレスは,新しい経路を通じて心臓細胞の核因子-kappaB (NF-kappaB) を活性化します. このメカニズムは,通常のイカッパバルファの分解を回避し,イシュケミア-再流出損傷中のNF-kappaBシグナル伝達においてチロシンリン酸化が明確な役割を果たすことを示唆しています.
科学分野:
- 心血管生物学 心血管生物学
- 分子生物学は分子生物学である.
- セルラー・シグナリング
背景:
- 核因子-kappaB (NF-kappaB) は,遺伝子発現に関与する酸化ストレス反応性転写因子です.
- 低血症および再注射中のNF-kappaB活性化の正確なメカニズムは,ほとんど不明のままです.
研究 の 目的:
- 人間の心臓組織と内皮細胞における酸化ストレスによって誘発されるNF-kappaB活性化の細胞メカニズムを調査する.
- ischemia-reperfusionの間にNF-kappaBの活性化に関与するシグナル伝達経路を解明する.
主な方法:
- 心肺バイパス手術による人間の心臓組織の分析.
- ヒューマン静脈内皮細胞 (HUVEC) を使った実験室内研究では,低酸素,再酸素化,過酸化水素 (H2O2) に曝露した.
- NF-kappaBの活性化とIkappaBalphaの分解を評価するために,電泳性移動シフトアッセイ (EMSA) とウエスタン・ブロッティング.
主要な成果:
- NF-kappaBの活性化は,心臓組織の不血症後および再注血で観察されました.
- 低酸素/低酸素化およびH2O2治療により,HUVECsでNF-kappaBの活性化が誘発されました.
- H2O2誘発のNF-kappaB活性化は,チロシンフォスファタゼ抑制によって強化された.
- 酸化ストレスによって誘発されたNF-kappaBの活性化は,イカッパバルファの分解とは独立して発生したが,腫瘍死滅因子アルファによって誘発された活性化とは違っていた.
結論:
- NF-kappaBの活性化のための刺激特有のメカニズムは,酸化ストレス中の内皮細胞に存在します.
- この経路は,イカッパバルファの分解とは独立して機能する.
- タイロシンリン酸化は,酸化ストレスによるNF-kappaB活性化において重要な役割を果たす可能性があります.
さらに関連する動画
関連する概念動画
Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Eukaryotic Transcription Inhibitors
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
NF-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...
Nitric Oxide Signaling Pathway
Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
NF-kB-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...
Transducer Mechanism: Nuclear Receptors
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:


