タンパク質C受容体による脂質表現は,凝固と自己免疫を結びつける
Nadine Müller-Calleja1,2,3, Anne Hollerbach1,2, Jennifer Royce3
1Center for Thrombosis and Hemostasis, Johannes Gutenberg University Medical Center, 55131 Mainz, Germany.
Science (New York, N.Y.)
|March 12, 2021
まとめ
アンチフォスフォリピド抗体 (aPLs) は,免疫細胞の脂質タンパク質複合体を標的にし,自己免疫疾患を誘発する. EPCR- LBPA信号との相互作用を阻害すると,マウスの血栓症と狼症の症状が軽減されます.
科学分野:
- 免疫学
- 自己免疫性
- 血管生物学
背景:
- アンチフォスフォリピド抗体 (aPLs) は,血管疾患や妊娠合併症を含む重度の自己免疫疾患の主要な要因です.
- aPLの正確な細胞表面標的とシグナル伝達メカニズムは,まだ完全には理解されていないため,治療開発を妨げています.
研究 の 目的:
- aPLsによって認識された特定の細胞表面抗原を識別する.
- この抗原がaPL媒介の血栓形成と炎症シグナル伝達における役割を明らかにする.
- 臨床前モデルでこの抗原を標的とした治療の可能性を評価する.
主な方法:
- 内皮タンパク質C受容体 (EPCR) によって標的抗原として提示される内皮リン酸 (LBPA) の識別.
- 生まれながらの免疫細胞におけるEPCR-LBPAとのaPL結合の分析.
- インターフェロンおよびトール型受容体7依存B1a細胞の膨張および自己抗体の生成の評価.
- システム性狼のマウスモデルにおける EPCR- LBPA 信号の薬理学的抑制
主要な成果:
- aPLは,先天的な免疫細胞のEPCR- LBPA複合体を認識し,エンドソーマの炎症信号を発信する.
- この相互作用はB1a細胞の膨張と自己抗体の生成を維持し,自己増強する自己免疫ループを永続化させます.
- マウスモデルでは,EPCR- LBPAシグナリングの薬理学的中断により,aPL誘発の病変と自己免疫が著しく弱まった.
結論:
- EPCR-LBPA複合体は,病原性 aPL の重要な細胞表面標的である.
- EPCR- LBPAの相互作用をターゲットにすることで,抗リン脂症症候群および関連する自己免疫疾患に対する有望な治療戦略が提供されます.
- この発見は,自免疫疾患の持続のための新しいメカニズムを明らかにし, 適応免疫と先天的な免疫の協力関係を含んでいます.
関連する概念動画
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
1.2K
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
1.2K
01:20Extrinsic and Intrinsic Pathways of Hemostasis
10.6K
Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
10.6K
01:29Autoimmune Disorders
1.1K
Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune...
Concept and Mechanism of Autoimmune Diseases
The immune...
1.1K
01:24Disorders of Hemostasis
1.6K
Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
1.6K
01:27Complement System
6.3K
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
6.3K
01:09Coagulation
8.7K
The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
8.7K