环境PM2.5的次慢性暴露会损害新奇的识别和空间记忆
bioRxiv : the preprint server for biology
|September 25, 2023
概括
接触细颗粒物 (PM2.5) 会损害小鼠的认知功能. 这项研究表明,暴露于PM2.5会对识别记忆和空间记忆产生负面影响,突出显示空气污染.
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:
- 空气污染,特别是细颗粒物 (PM2.5),对公众健康构成重大风险.
- 虽然对心血管和肺系统的影响已知,但新出现的证据将空气污染与认知衰退和神经退行性疾病联系起来.
- 鼠标模型提供了一种方法来确定PM2.5暴露和神经影响之间的因果关系.
研究的目的:
- 调查小鼠中PM2.5次慢性暴露和认知缺陷之间的因果关系.
- 评估PM2.5对识别记忆和空间记忆的影响,使用已建立的行为测试.
- 提供空气污染对大脑功能的有害影响的证据.
主要方法:
- 小鼠被亚慢性暴露在缩的环境PM2.5 (200μg/m3) 或过空气 (FA) 中,持续7周 (5天/周,8小时/天).
- 用于识别记忆的新型对象识别 (NOR) 测试和空间记忆的对象位置测试 (OLT) 来评估认知功能.
- 分析了包括探索时间和歧视指数在内的行为数据,以将暴露于PM2.5的小鼠与对照小鼠进行比较.
主要成果:
- 与FA对照组 (110%) 相比,暴露于PM2.5的小鼠在新物体探索 (42%) 中的增加明显较低,这表明识别记忆受损.
- 在暴露于PM2.5的小鼠中,NOR的歧视指数 (57.3%) 与FA对照 (67%) 相比较低.
- 暴露于PM2.5导致空间记忆的缺陷,对新型物体位置的探索时间没有显著增加,与FA小鼠 (62.6%) 相比,歧视指数较低 (51%).
结论:
- 长期暴露于高水平的PM2.5会导致小鼠的新奇识别和空间记忆显著受损.
- 这些发现表明,细颗粒物空气污染和认知缺陷之间存在直接的因果关系.
- 该研究强调了PM2.5的神经毒性潜力及其对认知功能的公共卫生影响.
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