首页> 外文期刊>Pharmacology, Biochemistry and Behavior >3H-L-glutamate binding and 3H-D-aspartate release from hippocampal tissue during the development of pentylenetetrazole kindling in rats.
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3H-L-glutamate binding and 3H-D-aspartate release from hippocampal tissue during the development of pentylenetetrazole kindling in rats.

机译:大鼠戊四氮点燃过程中海马组织中3H-L-谷氨酸的结合和3H-D-天冬氨酸的释放。

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Previous studies have proposed that there is an increase in the density of glutamate binding sites after pentylenetetrazol (PTZ) kindling, whereas the glutamate release is not altered. Little is known about the time course of these changes. Therefore, we studied 3H-L-glutamate binding to hippocampal membranes and K+-stimulated 3H-D-aspartate release from hippocampal slices of rats given PTZ 3, 7, and 13 times up to a fully kindling state. After three PTZ injections, amino acid release from hippocampal tissue slices was significantly enhanced in comparison to controls, whereas 3H-L-glutamate binding was not altered. After seven injections of PTZ, specific glutamate binding to hippocampal membranes tended to increase, and K+-stimulated 3H-D-aspartate release from rat hippocampal slices was normalized. The kindled state characterized by generalized clonic-tonic seizures was reached after 13 PTZ injections, and it was accompanied by an enhancement in the density of glutamate binding sites, whereas the chemically evoked amino acid release remained unchanged. It can be concluded that the amino acid release is increased in the early phase of PTZ kindling development, whereas after completion of kindling, the density of excitatory amino acid binding sites is enhanced.
机译:先前的研究提出,戊四氮(PTZ)点燃后,谷氨酸结合位点的密度增加,而谷氨酸的释放没有改变。对于这些更改的时间过程知之甚少。因此,我们研究了3H-L-谷氨酸与海马膜的结合以及K +刺激的3H-D-天门冬氨酸从PTZ分别以3、7和13倍达到完全点燃状态的海马切片中的释放。注射3次PTZ后,与对照组相比,海马组织切片中的氨基酸释放显着增强,而3H-L-谷氨酸的结合没有改变。七次PTZ注射后,特异谷氨酸与海马膜的结合趋于增加,并且K +刺激的3H-D-天门冬氨酸从大鼠海马切片的释放被标准化。在13次PTZ注射后,达到了以全身性阵挛性癫痫发作为特征的点燃状态,并伴随着谷氨酸结合位点密度的增加,而化学诱发的氨基酸释放保持不变。可以得出结论,在PTZ点燃过程的早期阶段,氨基酸释放增加,而点燃结束后,兴奋性氨基酸结合位点的密度增加。

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