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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

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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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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.
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基础科学和病原发生学

Jingxian Chen1, Bin Jiao1, Lu Shen1

  • 1Xiangya Hospital, Central South University, Changsha, Hunan, China.

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概括
此摘要是机器生成的。

摩拉菌 (Moraxella catarrhalis) 细菌及其外膜蛋白 UspA1 与阿尔茨海默氏症 (AD) 病原发生有关. 这种口腔细菌通过增加粉样蛋白前体蛋白 (APP) 和粉样β (Aβ) 水平,加剧了AD症状.

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科学领域:

  • 神经科学是一个神经科学.
  • 微生物学 微生物学
  • 遗传学 遗传学 是一个

背景情况:

  • 阿尔茨海默氏病 (AD) 的发病因子是多因素的,其中的假设包括粉样β (Aβ) 级联,陶过酸化和炎症.
  • 口腔微生物群在阿尔茨海默病发展中的特定作用仍然在很大程度上未被探索.

研究的目的:

  • 调查口腔微生物群,特别是Moraxella catarrhalis和阿尔茨海默病之间的联系.
  • 阐明Moraxella catarrhalis可能导致AD病变的机制.

主要方法:

  • 16S rDNA测序和qPCR被用来比较AD患者和对照者的脑脊液中的Moraxella物种丰度.
  • 细胞和动物模型 (5xFAD小鼠) 用于评估Moraxella catarrhalis,其细胞外囊泡和 UspA1蛋白对粉样蛋白前体蛋白 (APP) 和Aβ水平的影响.
  • 在小鼠模型中进行了行为和病理评估.

主要成果:

  • 在阿尔茨海默病患者中发现的莫拉克塞拉物种的丰度明显更高.
  • 摩拉虫,其细胞外囊泡,以及 UspA1 蛋白过度表达在体外上调了 APP 和 Aβ 水平.
  • 在小鼠体内注射Moraxella catarrhalis或 hippocampal UspA1过度表达时,大脑APP和Aβ水平升高,认知缺陷恶化.

结论:

  • 莫拉塞拉卡塔拉利斯通过其细胞外囊泡和 UspA1 蛋白质为AD 病变产生贡献.
  • 这些成分与APP蛋白质分解途径相互作用,增加Aβ生成.
  • 这些发现突出了口腔细菌与阿尔茨海默病进展之间的潜在联系.