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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

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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.
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Stages of Infection01:26

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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

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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
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基礎科学と病態生理

Glori Das1, Raksha Raghunathan1, Lin Wang1

  • 1Houston Methodist Research Institute, Houston, TX, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
PubMed
まとめ

アルツハイマー病(AD)の網膜における病理には、ミュラーグリア細胞(MGC)の変化とグリンパティッククリアランスの障害が関与する。MGCの早期網膜変化と末梢網膜の変化は、ADのバイオマーカーとして役立つ可能性がある。

科学分野:

  • 神経科学; 眼科学; 病理学

背景:

  • 網膜のアミロイドβ(Aβ)沈着物は、アルツハイマー病(AD)における脳Aβと相関する。; グリンパティッククリアランスの障害は、AD脳におけるAβ蓄積と関連している。; ミュラーグリア細胞(MGC)の変化は、網膜におけるAβ病理を悪化させる可能性がある。

研究 の 目的:

  • 視神経グリンパティッククリアランスの障害とMGCの変化が網膜Aβ蓄積に寄与するかどうかを調査する。; ADマウスモデルにおけるMGC表現型の違いと視神経グリンパティッククリアランス率を調べる。

主な方法:

  • 5xFAD(ADモデル)と野生型マウスを比較した。; 免疫蛍光法により、MGCのGFAP(神経膠症)とAQP4(グリンパティックドライバー)の発現を定量化した。; 蛍光標識Aβ40およびカダベリンの硝子体内注射を用いて、前行性グリンパティック輸送を評価した。

主要な成果:

  • 5xFAD網膜ではAQP4が上方制御され、血管周囲および神経膠質での局在が増強した。; 5xFADマウスの末梢網膜におけるGFAPの上昇は、反応性神経膠症を示唆する。; 視神経を介したトレーサーの前行性グリンパティック輸送は維持されていることが観察された。

結論:

  • MGCの生物学的変化は、症状発現前にADで早期に起こる可能性がある。; 末梢網膜は、AD病理および潜在的バイオマーカーの重要かつ未踏の領域である。; 診断および治療のためのAβ産生/クリアランスの相互作用を理解するためには、さらなる研究が必要である。
キーワード:
ミュラーグリア細胞アルツハイマー病網膜グリンパティックシステムアミロイドβ

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