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相关概念视频

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 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

Jorge Garcia Condado1,2,3, Colin Birkenbihl1, Hannah M Klinger1

  • 1Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
PubMed
概括
此摘要是机器生成的。

对加速灰质大脑衰老的遗传倾向与p-tau217升高有关,这是阿尔茨海默病早期生物标志物,特别是在老年人中. 这突显了AD病变发生过程中与年龄相互作用的遗传易感性.

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科学领域:

  • 神经成像和遗传学
  • 生物标志物研究 生物标志物研究
  • 阿尔茨海默氏症疾病的发病因子

背景情况:

  • 大脑年龄差距通过神经成像量化大脑年龄差异.
  • 脑年龄差异的多基因风险评分 (PRS) 估计了对加速大脑衰老的遗传倾向.
  • 了解遗传性大脑衰老倾向与早期阿尔茨海默病 (AD) 生物标志物之间的联系对于早期检测和干预至关重要.

研究的目的:

  • 研究更高或更低BrainAge Gap的遗传倾向与AD的血生物标志物之间的关联.
  • 探索影响大脑衰老的遗传因素如何与早期AD相关的变化有关.
  • 提高对早期AD机制和风险因素的理解.

主要方法:

  • 来自A4和LEARN研究的3014名认知正常参与者的分析.
  • 对灰色物质 (GM),白色物质 (WM) 和功能连接 (FC) BrainAge模型的PRS计算.
  • 血生物标志物的评估:p-tau217,GFAP和NfL,使用一般线性模型与年龄和PRS的相互作用术语.

主要成果:

  • 基于Aβ-PET状态,APOEε4载体,年龄,性别或教育,BrainAge PRS没有显著差异.
  • BrainAge GM PRS显示了与p-tau217水平 (p=0.01) 的积极关联,特别是在老年人中 (p=0.007).
  • 在任何BrainAge PRS和GFAP或NfL水平之间没有发现显著的关联.

结论:

  • 促进加速灰质大脑衰老的遗传因素与p-tau217有关,这是一个敏感的AD标志物.
  • 这种遗传倾向在老年人中更为明显,表明与年龄相关的相互作用.
  • 与灰色物质BrainAge PRS的特定关联表明它有可能成为AD风险的早期标志物.