Changes in D-aspartate ion currents in the Aplysia nervous system with aging.

Changes in D-aspartate ion currents in the Aplysia nervous system with aging.
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DOI:
10.1016/j.brainres.2010.05.001
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发表时间:
2010-07-09
期刊:
影响因子:
2.9
通讯作者:
Schmale, Michael C.
Schmale, Michael C.
中科院分区:
医学3区
文献类型:
--
作者:
Fieber, Lynne A.;Carlson, Stephen L.;Capo, Thomas R.;Schmale, Michael C.

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D-天冬氨酸 (D-Asp) 可替代兴奋性 Glu 受体上的 L-谷氨酸 (L-Glu),并在哺乳动物大脑中以游离 D-Asp 形式存在。研究了 D-Asp 电生理反应作为加州海兔 (Aplysia californica) 衰老的潜在相关性。对 3 个卵群中性成熟和衰老时的胸膜神经节 (PVC) 和颊神经节 S 簇 (BSC) 的原代神经元培养物进行全细胞电压和电流钳测量。 D-Asp 在 -70 mV 的超极化电压下激活内向电流,其中软体动物 NMDA 受体打开,不受 Mg2+ 的组成性阻断。一半细胞对 D-Asp 和 L-Glu 均有反应,而其余细胞仅对 D-Asp 或 L-Glu 反应,表明 D-Asp 激活这些细胞亚群中的非 Glu 通道。 D-Asp 诱导电流的频率及其密度在衰老的 PVC 细胞中显着降低,但在衰老的 BSC 细胞中却没有显着降低。尾部感觉神经元的这些变化预示着功能缺陷,这可能导致老年海兔反射运动的整体下降。
D-Aspartate (D-Asp) can substitute for L-Glutamate (L-Glu) at excitatory Glu receptors, and occurs as free D-Asp in the mammalian brain. D-Asp electrophysiological responses were studied as a potential correlate of aging in the California sea hare, Aplysia californica. Whole cell voltage- and current clamp measurements were made from primary neuron cultures of the pleural ganglion (PVC) and buccal ganglion S cluster (BSC) in 3 egg cohorts at sexual maturity and senescence. D-Asp activated an inward current at the hyperpolarized voltage of −70 mV, where molluscan NMDA receptors open free of constitutive block by Mg2+. Half of the cells responded to both D-Asp and L-Glu while the remainder responded only to D-Asp or L-Glu, suggesting that D-Asp activated non-Glu channels in a subpopulation of these cells. The frequency of D-Asp-induced currents and their density were significantly decreased in senescent PVC cells but not in senescent BSC cells. These changes in sensory neurons of the tail predict functional deficits that may contribute to an overall decline in reflexive movement in aged Aplysia.
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