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Infection01:20

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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

Soheil Mohammadi1, Mahsa Dolatshahi1, Paul K Commean1

  • 1Mallinckrodt Institute of Radiology, Washington University in St. Louis, St. Louis, MO, USA.

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中年肥胖和胰岛素抵抗与大脑结构变化和阿尔茨海默病风险较高的人群中的粉样蛋白负担增加有关. 这些代谢因素影响大脑体积和粉样蛋白积累,突出显示了潜在的早期干预目标.

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科学领域:

  • 神经科学是一个神经科学.
  • 代谢健康 代谢健康
  • 阿尔茨海默氏症疾病研究研究

背景情况:

  • 中年肥胖和胰岛素抵抗是已知的阿尔茨海默病 (AD) 风险因素.
  • 它们对大脑结构和AD生物标志物 (如粉样蛋白和蛋白) 的特定影响仍然不完全理解.

研究的目的:

  • 研究中年肥胖和胰岛素抵抗与大脑结构 (皮层厚度,大脑体积) 以及PET检测到的粉样蛋白和蛋白负担之间的关联.
  • 分析这些关联在认知正常的中年成年人中.

主要方法:

  • 80名认知正常的中年参与者接受了MRI,粉样蛋白和蛋白PET扫描以及代谢评估.
  • 参与者根据肥胖 (BMI ≥30 kg/m2) 和胰岛素耐药性 (HOMA-IR ≥1.9) 被分为四组.
  • 统计分析 (ANOVA,ANCOVA) 评估了不同组的大脑结构和生物标志物负担的差异.

主要成果:

  • 代谢异常肥胖 (MAO) 组与代谢正常非肥胖 (MNNO) 个体相比,显著减少了右带和左极体积.
  • 与MNNO组相比,MAO组也表现出明显更高的全脑粉样蛋白和下皮质粉样蛋白负担.
  • 两组之间没有观察到tau负荷的显著差异.

结论:

  • 中年肥胖与大脑体积减少和阿尔茨海默病相关区域粉样蛋白负担增加有关.
  • 没有tau差异可能表明该队列中疾病的亚临床阶段.