PCSK9和高脂肪饮食协同诱导神经血管功能障碍和神经炎症
bioRxiv : the preprint server for biology
|November 24, 2025
概括
代谢综合征加速大脑小血管疾病 (CSVD) 和认知障碍. 脂滴积聚微质 (LDAM) 将代谢压力与大脑血管功能障碍和记忆力缺陷联系起来.
科学领域:
- 神经科学是一个神经科学.
- 代谢综合征研究 代谢综合征研究
- 脑血管疾病 脑血管疾病
背景情况:
- 大脑小血管疾病 (CSVD) 是血管认知障碍和痴呆的主要原因,与代谢风险因素密切相关.
- 在代谢综合征驱动的脑血管病理中,遗传和环境因素之间的相互作用仍然不清楚.
研究的目的:
- 调查与动脉样硬化的代谢综合征的小鼠模型中的神经炎症和神经退行变化.
- 确定细胞表型和病理机制,将代谢压力与CSVD和认知缺陷联系起来.
主要方法:
- 使用一种小鼠模型,肝脏蛋白转化酶亚素/素9型 (PCSK9) 过度表达和高脂肪饮食 (HFD) 诱导代谢综合征和动脉样硬化.
- 采用三维光板显微镜和免疫型来分析脑血管完整性,微质激活和粉样β沉积.
- 用行为测试评估认知功能,以识别记忆和焦虑.
主要成果:
- PCSK9+HFD小鼠表现出标志性CSVD特征:血管稀缺,神经血管合受损,血脑屏障破坏,白质损伤,神经元损失和认知缺陷.
- 鉴定了脂滴积聚微质 (LDAM) 作为一种与代谢压力和脑血管功能障碍相关的新型表型.
- 在PCSK9+HFD小鼠中观察到血管粉样蛋白β沉积,表明代谢压力有助于脑血管粉样蛋白病理,并注意到识别记忆缺陷和增加焦虑.
结论:
- 严重的高胆固醇血症显著加快了CSVD的发病过程.
- LDAM代表了一个独特的病理特征,将系统代谢综合征与脑血管功能障碍和认知障碍联系起来.
- 了解这些机制对于开发针对代谢相关认知衰退的治疗策略至关重要.
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