神经退行性疾病中的大脑铁积累:空气污染是否起作用?
Jithin V George1, Kathryn J Hornburg2, Alyssa Merrill1
1Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA.
Particle and fibre toxicology
|May 1, 2025
概括
吸入的铁纳米粒子模仿空气污染,到达大脑并引起性别特异的神经退行性影响. 这凸显了暴露在铁的公共健康风险,特别是在地铁系统中.
科学领域:
- 环境健康 环境健康
- 神经科学是一个神经科学.
- 毒理学 毒理学 毒理学
背景情况:
- 过多的脑铁和空气污染与神经退行性疾病有关.
- 空气污染含有铁,一种氧化还原活性金属,可以在大脑中积累,可能是通过嗅觉吸收.
- 终身暴露于空气污染可能会导致神经退行性疾病中观察到的脑铁水平升高.
研究的目的:
- 为了测试吸入的氧化铁纳米颗粒是否到达大脑并引起神经毒性影响.
- 研究暴露在地铁系统中发现的度铁纳米颗粒的小鼠中神经退行性疾病的变化.
- 评估对吸入铁纳米粒子反应的性别特异性差异.
主要方法:
- 通过吸入氧化铁纳米颗粒,小鼠被暴露在 (大约. 150μg/m3) 在20天内.
- 在嗅球和暴露室中分析了铁的特异性.
- 评估大脑体积和扩散性变化,神经递质水平,阿尔茨海默氏症和帕金森病标志物以及行为变化.
主要成果:
- 铁的特异性证实了室内和嗅觉球体氧化铁之间的相似性.
- 雌性小鼠表现出类似阿尔茨海默病的特征:嗅球扩散性增加,记忆障碍和陶蛋白升高.
- 雄性小鼠表现出与帕金森病相关的变化:黑色物质体积增加和视神经/视道体积减少.
结论:
- 吸入的氧化铁纳米颗粒被嗅觉球吸收,并诱导取决于性别的神经退行性影响.
- 女性表现出类似阿尔茨海默氏症的病理,而男性表现出与帕金森病相关的变化.
- 吸入铁的暴露是神经退行性疾病的潜在危险因素,强调需要调节空气中的铁含量,特别是在像地铁站这样的封闭环境中.
相关概念视频
Types of Toxins
1.3K
Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
1.3K
Attention-Deficit/Hyperactivity Disorder
21
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
21
Alzheimer's Disease: Overview
315
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
315
Neural Regulation
39.0K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
39.0K
The Periodic Table and Organismal Elements
172.2K
Overview
172.2K
Chronic Obstructive Pulmonary Disease-II: Pathophysiology
2.7K
Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Inflammation
2.7K


