Alterations in the balance of protein kinase/phosphatase activities parallel reduced synaptic strength during aging.

Alterations in the balance of protein kinase/phosphatase activities parallel reduced synaptic strength during aging.
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衰老过程中蛋白激酶/磷酸酶活性平衡的改变与突触强度的降低同时发生。

DOI:
10.1152/jn.1998.80.3.1567
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发表时间:
1998
影响因子:
2.5
通讯作者:
Foster,TC
Foster,TC
中科院分区:
医学3区
文献类型:
--
作者:
Norris,CM;Halpain,S;Foster,TC

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诺里斯,克里斯托弗M.,Shelley Halpain和托马斯C. Foster.蛋白激酶/磷酸酶活性平衡的改变与衰老过程中突触强度的降低平行.神经生理学杂志80:1567-1570,1998。目前的研究探讨了衰老过程中蛋白磷酸化对突触强度的调节。浴用蛋白磷酸酶1和2A(PP 1和PP 2A)抑制剂calyculin A(1 μM)可增强老年雄性(20-24月龄)而非年轻成年雄性(4-6月龄)Fischer 344大鼠海马切片中CA 3-CA 1突触强度。同样,将PP 1和PP 2A抑制剂微囊藻毒素-L,R(5 μM)注射到CA 1细胞中,仅在老年大鼠脑片中引起细胞内突触反应的增加。相比之下,水浴应用丝氨酸/苏氨酸激酶抑制剂H-7(10 μM)仅在年轻成人组的切片中诱导突触强度降低。这些结果表明,磷酸化依赖性调节的内在突触效力的变化在老化过程中。
Norris, Christopher M., Shelley Halpain, and Thomas C. Foster.Alterations in the balance of protein kinase/phosphatase activities parallel reduced synaptic strength during aging.J. Neurophysiol.80: 1567–1570, 1998. The current research examined the regulation of synaptic strength by protein phosphorylation during aging. Bath application of the protein phosphatase 1 and 2A (PP1 and PP2A) inhibitor calyculin A (1 μM) enhanced CA3–CA1 synaptic strength in hippocampal slices from aged male (20–24 mo) but not from young adult male (4–6 mo) Fischer 344 rats. Similarly, injection of the PP1 and PP2A inhibitor microcystin–L,R (5 μM) into CA1 cells caused an increase in the intracellular synaptic response only in slices from aged rats. In contrast, bath application of the serine/threonine kinase inhibitor H-7 (10 μM) induced a decrease in synaptic strength only in slices from the young adult group. These results demonstrate that phosphorylation-dependent regulation of intrinsic synaptic efficacy changes during aging.
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