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吗啡对C6神经胶质瘤细胞Glu和Gln含量及其代谢关键酶转录活性的影响

王少华1,孙吉凤2,刘剑凯1,张连芝1,邓志会1   

  1. 1.吉林大学基础医学院生物化学与分子生物学教研室,吉林 长春 130021;  2.长春医学高等专科学校基础医学部生物化学教研室,吉林 长春 130031
  • 收稿日期:2007-10-10 修回日期:1900-01-01 出版日期:2008-09-28 发布日期:2008-09-28
  • 通讯作者: 刘剑凯

Effects of morphine on contents of glutamate and glutamine in cultured supernatant and transcripts of related metabolic key enzymes in C6 glioma cells

WANG Shao-hua1, SUN Ji-feng2, LIU Jian-kai1, ZHANG Lian-zhi1, DENG Zhi-hui1   

  1. 1.Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Jilin University,Changchun 130021, China; 2. Department of Biochemistry, Changchun Medical College, Changchun 130031, China
  • Received:2007-10-10 Revised:1900-01-01 Online:2008-09-28 Published:2008-09-28
  • Contact: LIU Jian-kai

摘要: 目的:研究吗啡对C6神经胶质瘤细胞谷氨酸(Glu)-谷氨酰胺(Gln)循环代谢产物含量及其相关酶基因转录的影响,探讨吗啡依赖与耐受的作用机制。 方法: 传代培养的C6神经胶质瘤细胞,随机分为4组:对照组( C组),吗啡组(M组),纳洛酮加吗啡组(N+M组)和纳洛酮组(N组),应用比色法测定C6神经胶质瘤细胞培养上清液中Glu及Gln的含量,应用半定量RT-PCR法测定C6神经胶质瘤细胞Glu-Gln 循环关键酶谷氨酰胺合成酶(GS)及谷氨酸脱氢酶(GDH) mRNA相对含量的变化。 结果: 与C组比较,M组细胞外Glu含量显著性增加(P<0.01)。与M组比较,N+M组细胞外Glu含量显著性降低(P<0.01);与C组比较,M组、N组以及N+M组细胞外Gln含量均降低,但差异无显著性(P>0.05)。与C组比较,M组、N组细胞GS mRNA转录活性均显著降低(P<0.01)。与M组比较,N+M组细胞GS mRNA转录活性显著升高(P<0.01);与C组比较,M组细胞GDH mRNA转录活性升高(P<0.05)。与M组比较,N+M组细胞GDH mRNA转录活性显著性升高(P<0.01)。 结论:吗啡可能通过对Glu-Gln 循环关键酶GS和GDH基因转录活性的影响调节细胞外Gln和Glu浓度,其机制可能与吗啡依赖等作用相关。

关键词: 谷氨酸, 谷氨酰胺, 谷氨酰胺合成酶, 谷氨酸脱氢酶

Abstract: Abstract:Objective To determine the effects of morphine on contents of glutamate (Glu) and glutamine (Gln) and transcripts of the related metabolic key enzymes in C6 glioma cells.Methods C6 glioma cells were cultivated and divided into 4 groups: control (C) group, morphine (M) group, morphine + naloxone (N+M) group, naloxone (N) group.Chromatometry was used to determine the contents of Glu and Gln in supernatant of cultured C6 glioma cells.RT-PCR was used to examine the relative mRNA contents of glutamine synthetase (GS) and glutamic acid dehydrogenase (GDH), which are the key enzymes of the Glu and Gln cycle.Results The extracellular Glu content was increased in M group compared with C group(P<0.01), while it was decreased significantly in N + M group compared with M group (P<0.01); the extracellular Gln content in all three groups except C group showed a decreasing tendency (P>0.05).GS mRNA transcripts were decreased in M or N group compared with C group (P<0.01), while they were increased in N + M group compared with M group (P<0.01); GDH mRNA transcripts were increased in M group compared with C group (P<0.05), and were increased in N +M group compared with M group (P<0.01).Conclusion Morphine might change the extracellular concentrations of Glu and Gln by regulation gene expressions of GS and GDH, the key enzymes of the Glu and Gln cycle, which might be related with the effects of morphine dependence.

Key words: glutamate, glutamine, glutamine synthetase, glutamate dehydrogenase

中图分类号: 

  • R749.6