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Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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Urinary Tract Infection II: Pathophysiology01:25

Urinary Tract Infection II: Pathophysiology

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
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Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

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The pathophysiology of pneumonia involves the following steps:
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Stages of Infection01:26

Stages of Infection

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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基礎科学と病態生理

Silvia Fossati1

  • 1Alzheimer's Center at Temple, Lewis Katz School of Medicine, Philadelphia, PA, USA.

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まとめ
この要約は機械生成です。

アルツハイマー病とタウ病理は脳内皮細胞を解糖系にシフトさせ、炎症と血液脳関門の透過性を亢進させる。正常な代謝を回復させることは、これらの有害な影響を逆転させ、新たな治療標的を提供する。

キーワード:
アルツハイマー病タウ病理脳内皮細胞代謝血液脳関門炎症解糖系治療標的

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科学分野:

  • 神経科学
  • 細胞生物学
  • 生化学

背景:

  • 脳内皮細胞(cEC)は、血液脳関門(BBB)の完全性と神経血管単位の機能にとって重要である。
  • cECの機能不全は、アルツハイマー病(AD)および脳アミロイド血管症(CAA)で見られる神経炎症、神経変性、および微小出血に寄与する。
  • 病理学的アミロイドβ(Aβ)およびタウ凝集体はcEC代謝を変化させ、解糖系を促進し、ミトコンドリア機能を損ない、これはBBB透過性と関連している。

研究 の 目的:

  • ADおよびCAA病理がcEC機能をどのように変化させるかのメカニズムを調査すること。
  • cEC機能不全がBBBおよび神経血管の変化をどのように媒介するかを理解すること。
  • cECにおける代謝シフトと内皮細胞の炎症活性化およびBBB透過性との関連を探求すること。

主な方法:

  • Seahorse Extracellular Flux Analyzerを用いて、ヒトcECにおけるミトコンドリア呼吸と解糖系を評価した。
  • ECIS Zθシステムを用いた経内皮電気抵抗(TEER)によりBBB機能を測定した。
  • MSD V-Plex Neuroinflammatory Panel、Western Blot、および免疫蛍光法を用いて、内皮細胞の炎症活性化および血管機能不全経路を定量化した。
  • インビトロおよび脳アミロイドーシスとタウ病理の動物モデルにおいて、解糖系阻害がBBBおよび神経血管機能不全に及ぼす影響を調査した。

主要な成果:

  • Aβとタウの両方の凝集体は、cECにおける代謝を解糖系へとシフトさせ、炎症活性化とBBB透過性の亢進を引き起こす。
  • 解糖系を正常レベルに低下させることで、AD病理学的凝集体によって引き起こされる有害な脳血管効果を逆転させることができる。
  • Aβは直接cECをミトコンドリア呼吸から解糖系へと切り替え、一方タウは最初に解糖系を過剰活性化させ、炎症とBBB透過性を引き起こし、続いてミトコンドリア機能障害と細胞死を引き起こす。
  • 主要な発見は、脳アミロイドーシスとタウ病理の動物モデルで確認された。

結論:

  • Aβおよびタウ種によって媒介される内皮細胞の炎症活性化およびBBB病理を含む、新たな代謝メカニズムが特定された。
  • この代謝経路を標的とすることは、AD、CAA、およびタウ病理に対する潜在的な治療戦略を提供する。
  • 内皮細胞の代謝を正常化することを目的とした介入は、神経変性疾患における免疫細胞の浸潤とBBB透過性を制限する可能性がある。