内皮細胞のプロテアゼの活性化により,タンパク質C経路による受容体1が活性化されます
Matthias Riewald1, Ramona J Petrovan, Aaron Donner
1Department of Immunology, C204, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
Science (New York, N.Y.)
|June 8, 2002
まとめ
タンパク質C (PC) 経路は,セプシスから保護します. アクティベーションPC (APC) は,EPCRを使用してPAR1を通じて信号を送り,MCP-1のような保護性遺伝子を誘導し,それはセプシス防御に不可欠です.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 免疫学 免疫学とは
背景:
- セプシスは有害な凝固と炎症を伴う.
- タンパク質C (PC) 経路は,敗血症に対する保護を提供します.
- 活性化タンパク質C (APC) は,内皮細胞と相互作用する.
研究 の 目的:
- セプシスにおけるAPCの保護効果のメカニズムを調査する.
- APCの保護作用に関与する特定の受容体とシグナル伝達経路を特定する.
- PAR1シグナル伝達がAPC誘発の保護性遺伝子発現を媒介するかどうかを判断する.
主な方法:
- APCによって誘発された遺伝子発現の変化を分析するための遺伝子プロファイリング.
- 核受容体としての内皮細胞PC受容体 (EPCR) の役割を調査する.
- APCによるプロテアゼ活性化受容体1 (PAR1) の分裂を検証する.
- PAR1 と PAR2 の間の信号伝達を比較する.
主要な成果:
- APCは,内皮細胞のPAR1分裂のためのコアレセプターとしてEPCRを使用します.
- PAR1シグナリングは,すべてのAPC保護遺伝子の誘導を完全に説明します.
- 免疫調節遺伝子のモノサイト化学誘導タンパク質-1 (MCP-1) は,PAR1の活性化によって選択的に誘発された.
- PAR2の活性化はMCP-1を誘導しなかった.
結論:
- 原型トロンビン受容体であるPAR1は,EPCRに依存したAPC信号伝達の標的である.
- この受容体カスケードは,セプシスの予防に重要な役割を果たします.
- EPCR-PAR1経路を標的とした治療は,セプシスの治療戦略を提供することができる.
関連する概念動画
01:16Cell Motility through Blebbing
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
01:25cAMP-dependent Protein Kinase Pathways
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,...
01:15Activation of Integrins
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
01:24B Cell Activation and Differentiation
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...