SFTSVは,AXL-キナーゼによって活性化されたPI3K-PLC依存マクロピノシトーシス経由でAXL/GAS6を利用する
Zecheng Jin1,2,3, Shuhei Taguwa1,2,3, Junki Hirano1,2
1Center for Infectious Disease Education and Research (CiDER), Osaka University, Osaka, Japan.
Journal of virology
|August 25, 2025
まとめ
血小板減少症候群ウイルス (SFTSV) による重度の発熱は,受容体チロシンキナーゼであるAXLを用いて細胞に侵入する. この発見はSFTSV感染の新たな経路を明らかにし,AXLを潜在的な治療標的として提供します.
科学分野:
- ウイルス学
- 細胞生物学
- 分子医学
背景:
- 血小板減少症候群 (SFTS) を伴う重度の発熱は,SFTSウイルス (SFTSV) によって引き起こされる深刻な公衆衛生問題です.
- 以前の研究では,DC-SIGNとC型レクチンがSFTSV受容体であると特定されたが,完全な侵入メカニズムは不明であった.
研究 の 目的:
- SFTSVの新しい細胞受容体と侵入経路を特定する.
- SFTSV感染の潜在的な治療標的を探求する.
主な方法:
- SFTSVのエントリー受容体を特定するための全ゲノムCRISPR活性化スクリーニング.
- SFTSVの侵入におけるAXL,成長停止特異タンパク質6,PI3K,PLCの役割を調査する.
- HUVECを含む様々な細胞タイプにおけるSFTSV感染モデルを使用する.
主要な成果:
- AXLは,受容体チロシンキナーゼであり,SFTSVの新規エントリー受容体として特定されました.
- AXL経由でのSFTSVの侵入は,PI3KとPLCの募集につながる成長停止特異のタンパク質6を含みます.
- この相互作用は,複数の細胞タイプで確認されたSFTSVの侵入のためのマクロピノサイトス経路を誘発します.
結論:
- AXLは,PI3K/PLC依存のマクロピノサイトーシス経路を通じてSFTSVの侵入を媒介する.
- この経路は,以前に知られているウイルスの侵入メカニズムとは異なる.
- AXLはSFTSVに対する新たな戦略の開発において有望な治療目標である.
さらに関連する動画
関連する概念動画
Intracellular Signaling Affects Focal Adhesions
2.8K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.8K
IP3/DAG Signaling Pathway
12.4K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
12.4K
Membrane Asymmetry Regulating Transporters
4.9K
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
4.9K
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
Mechanism of Filopodia Formation
2.5K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.5K


