Age- and brain region-specific differences in mitochondrial bioenergetics in Brown Norway rats.

Age- and brain region-specific differences in mitochondrial bioenergetics in Brown Norway rats.
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棕色挪威大鼠线粒体生物能学的年龄和大脑区域特异性差异。

DOI:
10.1016/j.neurobiolaging.2016.02.027
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发表时间:
2016
影响因子:
4.2
通讯作者:
Kodavanti,PrasadaRaoS
Kodavanti,PrasadaRaoS
中科院分区:
医学2区
文献类型:
--
作者:
Pandya,JigneshD;Royland,JoyceE;MacPhail,RobertC;Sullivan,PatrickG;Kodavanti,PrasadaRaoS

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线粒体是能量平衡的中心调节器,在细胞衰老机制中起关键作用。本研究的目的是评估5个脑区的线粒体生物能量参数(脑干[BS]、额叶皮质、小脑、纹状体、海马[HIP])(1个月[年轻],4个月[成年],12个月[中年],24个月[老年]),以了解选定的大脑区域中与年龄相关的差异及其对与年龄相关的化学敏感性的可能贡献。在相同的条件下,在Brown Norway大鼠(n = 5/组)的多个年龄组和脑区域中测量线粒体生物能量参数和酶活性。结果表明线粒体功能终点的年龄和大脑区域特异性模式。例如,在BS和HIP中观察到ATP合成(状态III呼吸)的年龄特异性下降。同样,最大呼吸能力(状态V1和V2)在所有检查的脑区均显示出年龄特异性下降(年轻>成年>中年>老年)。在所有区域中,HIP在线粒体生物能量学方面的变化最大,在4个月、12个月和24个月年龄组中表现出下降。线粒体丙酮酸脱氢酶复合物和电子传递链复合物I,II和IV酶的活性也具有年龄和脑区特异性。一般来说,与年龄相关的变化更明显,酶活性随着动物年龄的增长而下降(年轻>成年>中年>老年)。这些年龄和大脑区域特定的观察可能有助于评估大脑生物能量对与年龄相关的环境化学应激敏感性的影响。
Mitochondria are central regulators of energy homeostasis and play a pivotal role in mechanisms of cellular senescence. The objective of the present study was to evaluate mitochondrial bioenergetic parameters in 5 brain regions (brain stem [BS], frontal cortex, cerebellum, striatum, hippocampus [HIP]) of 4 diverse age groups (1 month [young], 4 months [adult], 12 months [middle-aged], 24 months [old age]) to understand age-related differences in selected brain regions and their possible contribution to age-related chemical sensitivity. Mitochondrial bioenergetic parameters and enzyme activities were measured under identical conditions across multiple age groups and brain regions in Brown Norway rats (n = 5/group). The results indicate age- and brain region–specific patterns in mitochondrial functional endpoints. For example, an age-specific decline in ATP synthesis (State III respiration) was observed in BS and HIP. Similarly, the maximal respiratory capacities (State V1and V2) showed age-specific declines in all brain regions examined (young > adult > middle-aged > old age). Amongst all regions, HIP had the greatest change in mitochondrial bioenergetics, showing declines in the 4, 12, and 24-months age groups. Activities of mitochondrial pyruvate dehydrogenase complex and electron transport chain complexes I, II, and IV enzymes were also age and brain region specific. In general, changes associated with age were more pronounced with enzyme activities declining as the animals aged (young > adult > middle-aged > old age). These age- and brain region-specific observations may aid in evaluating brain bioenergetic impact on the age-related susceptibility to environmental chemical stressors.
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DOI: --
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DOI: 10.1017/s0016672300013902
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期刊: Genetics Research
影响因子: 1.5
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