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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.
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Urinary Tract Infection II: Pathophysiology01:25

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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 (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 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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基础科学和病原发生学

Huong T Phuong1, Rodrigo Francisco Tomas1, Cemal Akamese1

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此摘要是机器生成的。

新的发现显示,阿尔茨海默病 (AD) 大脑中的多-甘氨酸-氨酸 (polyGR +) 聚合物与粉样质斑块和陶相关. 这些聚合物还破坏了自-溶酶体通路,这是一个关键的细胞过程.

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科学领域:

  • 神经科学是一个神经科学.
  • 细胞生物学 细胞生物学
  • 病理学 病理学 病理学

背景情况:

  • 阿尔茨海默病 (AD) 是一种流行的神经退行性疾病,影响65岁以上的个体,其特点是认知能力下降,β-粉样蛋白 (Aβ) 斑块和高酸化的 (pTau) .
  • 导致AD病变的精确分子机制尚不完全理解.
  • 最近的研究在AD尸检大脑中发现了含有 (polyGR+) 聚甘氨酸和氨酸的聚合物,具有与AD风险增加相关的特定CASP8基因变异.

研究的目的:

  • 研究聚GR+聚合物与已确定的AD病理特征,即Aβ斑块和pTau结之间的关联.
  • 确定polyGR+聚合物是否与自-溶酶体通路的破坏有关,这对于细胞蛋白质稳态至关重要.

主要方法:

  • 在133个AD病例,30个对照组和15个初级年龄相关病症 (PART) 病例的海马部分进行了免疫组织化学染色,以评估多GR+,Aβ和pTau水平.
  • 使用双重免疫光染色检查了polyGR+聚合物与自-溶酶体标记物 (p62和LC3B) 的同局部化.

主要成果:

  • 在大约50%的AD大脑中经常观察到多重GR+聚合物,但在对照和PART病例中没有 (p < 0.0001).
  • 在polyGR+染色水平和海马中的Aβ (R2=0.2544,p=0.0007) 和pTau (R2=0.2822,p=0.0003) 沉积之间发现了显著的正相关性.
  • 聚GR+聚合物显示与p62和LC3B的同局部化,表明与自-溶酶体通路的关联.

结论:

  • 聚GR+聚合物代表了阿尔茨海默氏症大脑中重要的蛋白质病理特征.
  • 聚GR+聚合物与自和蛋白质酶体标记物的同局部表明自-溶酶体路径的失调,有助于AD的发病.