関連する実験動画
Updated: Sep 10, 2025

08:32
Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
10.6K
MAVSのリン酸化は,抗ウイルス免疫を調節する細胞ストレスセンサとして作用する
Dongyi Zhao1,2, Nao Morimoto1, Riho Saito1,2
1Laboratory of Molecular Cell Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido 060-0815, Japan.
iScience
|August 21, 2025
まとめ
細胞のストレスは,RIG-I型受容体のシグナル伝達における重要なステップであるMAVSのリン酸化を促進することによって,抗ウイルス免疫を強化する. これはストレス経路と I型インターフェロンの産生を結びつけ,ウイルス感染に対する先天的な免疫反応を高めます.
科学分野:
- 免疫学
- 分子生物学
- ウイルス学
背景:
- サイトゾリックRIG- I型受容体 (RLR) は,ウイルスのRNAを検出し,MAVS経由で先天的な免疫反応を誘発する.
- MAVSのシグナリングは,抗ウイルス防御に不可欠なタイプIインターフェロン (IFN) 産生とアポトーシスを引き起こす.
- MAVS媒介の抗ウイルス免疫に対する細胞ストレスの影響は十分に理解されていません.
研究 の 目的:
- MAVSシグナル伝達とタイプI IFN生成における細胞ストレスの役割を調査する.
- 細胞のストレスとMAVS依存の抗ウイルス免疫を統合する分子メカニズムを解明する.
主な方法:
- ASK1によって活性化されたp38 MAPKによる調査されたMAVSリン酸化.
- TRAFアダプタータンパク質との相互作用を評価した.
- 野生型および変異型MAVSを用いて,様々なストレス条件 (酸化性,ERストレス) の下でウイルス感染に対する反応としてIFN発現を分析した.
主要な成果:
- ASK1で活性化されたp38 MAPKによって媒介されるMAVSのリン酸化は,MAVSとTRAFの相互作用を強化する.
- 細胞ストレス (酸化,ER) は,ウイルス誘発型I型IFN発現を著しく増幅する.
- このストレス誘発の増幅は,MAVSのリン酸化部位に依存しています.
結論:
- MAVSのリン酸化は,細胞のストレス信号を抗ウイルス性先天免疫に統合する重要なメカニズムです.
- MAPK経路は,MAVSリン酸化を通して,抗ウイルス反応を調節する細胞ストレスセンサーとして作用します.
- MAVSのリン酸化は,細胞のストレスレベルの影響で,文脈に依存した方法で抗ウイルス免疫を微調整します.
関連する概念動画
cAMP-dependent Protein Kinase Pathways
6.6K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
6.6K
Immune Response Against Viral Pathogens
917
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
917
MAPK Signaling Cascades
6.0K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
6.0K
PI3K/mTOR/AKT Signaling Pathway
3.9K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.9K
The JAK-STAT Signaling Pathway
9.2K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
9.2K
mTOR Signaling and Cancer Progression
3.9K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.9K

