丰富环境刺激对小鼠脑认知储备影响的定量研究

摘要

Objective To explore the effect of enriched environmental stimulation on mouse brain cognitive reserve to enhance the sensitivity of brain age gap estimation (BrainAGE).Methods Twenty-one healthy adult C57BL / 6J male mice,15 months old,were divided into a group with a standard environment and two groups with enriched environments.All the groups underwent magnetic resonance microcopy.Scaled subprofile model was used to analyze the features reflecting the changes of brain cognitive reserve.Results There were significant differences between the mean BrainAGE of the two groups with enriched environments and that of the remained standard environment group,then it's proved that some assumption might be reasonable that brain cognitive reserve could be estimated based on BrainAGE.Optim ized BrainAGE model made explanations for 58.9％ differences during stimulus phase in enriched environment.Conclusion Improved BrainAGE model gains high sensitivity when used to measure the redundancy of brain cognitive reserve.%目的:研究丰富环境刺激对小鼠脑认知储备的影响,以改进大脑年龄估值差(brain age gap estimation,BrainAGE)敏感度较低的问题.方法:采用21只清洁级健康成年C57BL/6J雄性小鼠(15月龄),并基于标准环境组、丰富环境组一、丰富环境组二的磁共振显微成像(magnetic resonance microcopy,MRM),运用尺度子配置模型(scaled subprofile model,SSM)对组间最能反映认知储备变化的特征进行分析.结果:丰富环境组和标准环境组的平均BrainAGE在刺激开始后始终存在显著差异.验证了基于BrainAGE预测认知储备的一些假设,经优化后的BrainAGE预测模型可以解释丰富环境刺激时间中58.9％的差异.结论:改善后的BrainAGE测量模型对测量认知储备的余度具有敏感性,可以较好地预测认知储备的余度.