Amino acid neurotransmitters facilitate the transmission of nerve messages across the synapses and play essential roles in the control and regulation of a variety of functions in the central and peripheral nervous sys...
详细信息
Amino acid neurotransmitters facilitate the transmission of nerve messages across the synapses and play essential roles in the control and regulation of a variety of functions in the central and peripheral nervous system. In this study, we developed a sensitive and efficient method using high-performance liquid chromatography （HPLC） with fluorescence detection for the assay of five important amino acid n After derivatization with o-phthaldialdehyde （OPA）, aspartate （Asp）, glutamic acid （Glu）, glycine （Gly）, taurine （Tau） and ）,-aminobutyric acid （GABA） were simultaneously detected in the presence of the internal standard homoserine （Hse）. Precise separation of these five amino acids was achieved using isocratic elution within 24 min. Good linearity was found over the concentration range with correlation coefficients （r2） not less than 0.9998. The limit of detection （LOD） values were no more than 10 nmol/L. The intra- and inter-day reproducibility was adequate with the relative standard deviation （RSD） of 10.5% or below. This method has also been applied to the analysis of amino acids in the substantia nigra and striatum samples obtained from C57BL/6 mice.
本研究观察了3α-雄烷二醇(3α-androstanediol,3α-diol)对戊四氮(pentylenetetrazole,PTZ)致痫大鼠抽搐发作及脑电图变化的影响,旨在从行为学及脑电图两方面的表现来探索3α-diol在癫痫发作中所起的作用。将32只雄性Sprague-Dawley大鼠随机均分成4组:正常+茶油+致痫(N+oil+PTZ)组、正常+3α-diol+致痫(N+3α-diol+PTZ)组、阉割+茶油+致痫(GDX+oil+PTZ)组和阉割+3α-diol+致痫(GDX+3α-diol+PTZ)组,记录和分析各组大鼠行为学及脑电图的变化。行为学观察结果显示:GDX+oil+PTZ组较N+oil+PTZ组阵挛发作及强直-阵挛发作的潜伏期均明显缩短,强直-阵挛发作的次数明显增多(P<0.05);GDX+3α-diol+PTZ组与GDX+oil+PTZ组相比较,N+3α-diol+PTZ组与N+oil+PTZ组相比较,阵挛发作及强直-阵挛发作的潜伏期均明显延长,阵挛发作及强直-阵挛发作的次数均明显减少(P<0.05)。脑电图分析结果显示:GDX+oil+PTZ组较N+oil+PTZ组痫波出现的潜伏期明显缩短,痫波发放的次数明显增多(P<0.05);GDX+3α-diol+PTZ组与GDX+oil+PTZ组相比较,N+3α-diol+PTZ组与N+oil+PTZ组相比较,痫波出现的潜伏期明显延长,痫波发放的次数明显减少,脑电频谱总功率变化百分比(percentage of total power of spectrum,TP%)明显减小(P<0.05)。这些结果提示,3α-diol对阉割和正常的致痫大鼠均具有一定的抗痫作用。
暂无评论