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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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The pathophysiology of pneumonia involves the following steps:
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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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基础科学和病原发生学

Giovanna De Chiara1, Virginia Protto2, Mariya Timotey Miteva1

  • 1Institute of Translational Pharmacology, CNR, Rome, Rome, Italy.

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简单疹病毒1型 (HSV-1) 感染促进阿尔茨海默病 (AD) 通过通过细胞外囊泡传播tau蛋白和激活补充系统,导致突触损伤. 这项研究揭示了将HSV-1与神经退行症联系起来的关键机制.

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科学领域:

  • 神经科学是一个神经科学.
  • 免疫学 免疫学 免疫学
  • 病毒学 病毒学

背景情况:

  • 复发性简单疹病毒1型 (HSV-1) 感染是阿尔茨海默氏病 (AD) 的一种风险因素.
  • 以前的研究将HSV-1与AD生物标志物,神经炎症和认知衰退联系起来.
  • 在AD病变发生的新机制包括细胞外囊泡 (EVs) 毒性蛋白质的传播和补充级联激活的突触消除.

研究的目的:

  • 调查HSV-1感染/再激活是否激活了EV介导的ptau传播,并补充了级联途径.
  • 在各种模型中探索这些途径在HSV-1诱导的神经退行症中的作用.

主要方法:

  • 使用了体外 (小鼠神经元,BV2微质),体内 (BALB/c小鼠) 和体外 (海马片) 的HSV-1感染模型.
  • 进行了分子,生化,病毒学和功能分析.
  • 研究了EV介导的ptau传播,补充蛋白质表达,微质细胞化和突触密度.

主要成果:

  • 在体外和体内,HSV-1利用EV传播高酸化 (ptau),受体神经元将EV-ptau内化.
  • 感染HSV-1显著增加补充蛋白 (例如C1q,C4) 和突触材料的微质细胞化.
  • 补充抑制和阻断部分预防了HSV-1引起的突触损伤,并挽救了脊柱密度的下降.

结论:

  • HSV-1感染激活了EV介导的ptau传播,并补充了级联激活.
  • 这些通路在HSV-1感染中导致突触损伤和神经退行.
  • 这些发现突出了将HSV-1与阿尔茨海默氏症病原体联系起来的新机制.