Circadian rhythms in SAMP8: a longitudinal study of the effects of age and experience.

Circadian rhythms in SAMP8: a longitudinal study of the effects of age and experience.
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SAMP8 中的昼夜节律:年龄和经验影响的纵向研究。

DOI:
10.1016/s0197-4580(03)00029-0
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发表时间:
2004
影响因子:
4.2
通讯作者:
McAuley,JDevin
McAuley,JDevin
中科院分区:
医学2区
文献类型:
--
作者:
Pang,KevinCH;Miller,JonathanP;McAuley,JDevin

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对昼夜节律的节律相关影响包括节律振幅的降低、再夹带的改变和碎片化的增加。目前,这些变化在个体一生中的模式尚不清楚。本研究采用交叉序贯实验设计,以确定昼夜节律变化的模式,确定预测后期昼夜节律中断,并评估先前的运行轮经验对昼夜节律的影响。在2、7和12月龄的加速衰老小鼠(SAMP8)中评估转轮活动。运动相关的变化包括转轮活动减少,昼夜节律幅度减少,光活动比例增加,分裂活动节律增加。2个月时轻度活动的比例是7个月时昼夜节律紊乱的良好预测因素。跑轮的经验增加了整体活动和减少比例的轻活动,但没有改变节奏的幅度或周期。这些结果表明,老化产生了几种模式的昼夜节律变化,描述了未来的节奏中断的预测措施,并建议干预,以减少昼夜节律中断。
Age-related effects on circadian rhythms include reductions of rhythm amplitude, alterations in re-entrainment, and increased fragmentation. Currently, the pattern of these changes across an individuals’ lifespan is unknown. The present study used a cross-sequential experimental design to determine the pattern of circadian rhythm changes, identify predictors of later circadian rhythm disruption, and assess the effect of prior run-wheel experience on circadian rhythms. Run-wheel activity was assessed in senescence-accelerated mice (SAMP8) at 2, 7, and 12 months of age. Age-related changes included decrease of run-wheel activity, decrease in circadian rhythm amplitude, increase in proportion of light activity, and increase in split activity rhythms. Proportion of light activity at 2 months was a good predictor of circadian rhythm disruption at 7 months. Run-wheel experience increased overall activity and decreased proportion of light activity, but did not alter rhythm amplitude or period. These results demonstrate that aging produces several patterns of circadian rhythm changes, describe predictive measures of future rhythm disruptions, and suggest an intervention to reduce circadian rhythm disruptions.
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影响因子: --
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期刊: The Journal of biological chemistry
影响因子: --
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