MRI-derived brain age as a biomarker of ageing in rats: validation using a healthy lifestyle intervention

MRI-derived brain age as a biomarker of ageing in rats: validation using a healthy lifestyle intervention
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MRI 衍生的大脑年龄作为大鼠衰老的生物标志物:使用健康生活方式干预进行验证

DOI:
10.1101/2021.04.19.440433
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发表时间:
2021
期刊:
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影响因子:
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通讯作者:
Brusini I
Brusini I
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作者:
Brusini I

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从MRI预测的大脑年龄和实际年龄之间的差异(所谓的BrainAGE)已被提议作为衰老生物标志物。我们分析其跨物种的潜力进行测试,对大鼠进行老化调制干预。我们的大鼠脑年龄预测模型结合了高斯过程回归和分类器,并在31只正常老龄大鼠的纵向数据集上使用交叉验证实现了4.87周的平均绝对误差(MAE)。然后对两组24只大鼠进行测试(MAE = 9.89周,相关系数= 0.86):对照组与长期环境富集和饮食限制(EEDR)组。使用线性混合效应模型,在EEDR大鼠中发现BrainAGE随实际年龄增加更慢(相互作用项p = 0.015)。考克斯回归显示,5个月时年龄较大的BrainAGE与较高的死亡风险相关(p = 0.03)。我们的研究结果表明,与生活方式相关的预防方法可能有助于减缓啮齿动物的大脑衰老,以及BrainAGE作为与年龄相关的健康结果预测因子的潜力。
The difference between brain age predicted from MRI and chronological age (the so-called BrainAGE) has been proposed as an ageing biomarker. We analyse its cross-species potential by testing it on rats undergoing an ageing modulation intervention. Our rat brain age prediction model combined Gaussian process regression with a classifier and achieved a mean absolute error (MAE) of 4.87 weeks using cross-validation on a longitudinal dataset of 31 normal ageing rats. It was then tested on two groups of 24 rats (MAE= 9.89 weeks, correlation coefficient= 0.86): controls vs. a group under long-term environmental enrichment and dietary restriction (EEDR). Using a linear mixed-effects model, BrainAGE was found to increase more slowly with chronological age in EEDR rats (p= 0.015 for the interaction term). Cox regression showed that older BrainAGE at 5 months was associated with higher mortality risk (p= 0.03). Our findings suggest that lifestyle-related prevention approaches may help to slow down brain ageing in rodents and the potential of BrainAGE as a predictor of age-related health outcomes.
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