Methamphetamine Alters Methylation Modifications of Synaptic Plasticity Genes in Addicted Mice
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摘要:
目的 研究慢性甲基苯丙胺(methamphetamine,MA)成瘾小鼠神经突触可塑性基因的表达变化情况。 方法 选用C57BL/6J小鼠,模拟人类药物成瘾模式,分段渐进性腹腔注射给药5 mg/kg、10 mg/kg或者生理盐水。选取小鼠的大脑皮质和海马组织,通过亚硫酸氢盐处理基因组DNA和甲基化特异性PCR (methylmion specific PCR,MSP)对突触可塑性基因表达水平进行检测,运用BiQ-Analyzer软件对测序结果进行比对和DNA甲基化分析。 结果 相比盐水处理组小鼠,MA成瘾组小鼠大脑皮层的Egr2 (P = 0.064)基因启动子CpG位点的甲基化修饰增加,而Eln(P = 0.083)基因启动子的甲基化修饰降低;海马组织中,Arc(P = 0.025)、Egr2(P = 0.034)基因甲基化修饰增加,而Eln(P = 0.063)基因甲基化修饰降低。 结论 突触可塑性基因的甲基化修饰可能参与MA成瘾机制的形成。 Abstract:Objective To investigate the expression changes of synaptic plasticity genes in chronic methamphetamine (MA) addicted mice. Methods C57BL/6J mice were selected to simulate the human drug addiction model, and the drugs were injected intraperitoneally with 5 mg/kg, 10 mg/kg or normal saline. The cerebral cortex and hippocampus of mice were selected, and the gene expression level of synaptic plasticity was detected by bisulfite treated genomic DNA and methylation specific PCR (MethylmionSpecificPCR, MSP). The sequencing results were compared and DNA methylation was analyzed by BiQ-Analyzer software. Results Compared to mice in the saline-treated group, MA addiction group mice showed increased methylation modification of the Egr2 (P = 0.064) gene promoter CpG site and decreased methylation modification of the Eln (P = 0.083) gene promoter in the cerebral cortex; in hippocampal tissue, methylation modification of the Arc (P = 0.025) and Egr2 (P = 0.034) genes was increased, while Eln (P = 0.063) gene methylation modifications were decreased. Conclusion Methylation of synaptic plasticity genes may be involved in the formation of MA addiction mechanism. -
Key words:
- Methamphetamine /
- Synaptic plasticity /
- Immediate early gene /
- DNA Methylation.
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图 1 生理盐水处理组和MA处理组大脑皮质和海马组织CpG岛甲基化修饰对比
A:生理盐水处理组和MA处理组大脑皮质基因组和海马组织基因组Arc启动子BSP测序结果,在海马组织中Arc(P < 0.05);B:生理盐水处理组和MA处理组大脑皮质基因组和海马组织基因组Fos启动子BSP测序结果;C:生理盐水处理组和MA处理组大脑皮质基因组和海马组织基因组Egr2启动子BSP测序结果,在海马组织中Egr2(P < 0.05);D:生理盐水处理组和MA处理组大脑皮质基因组和海马组织基因组Egr4启动子BSP测序结果。甲基化的CpG位点用实心圆圈表示、非甲基化的CpG位点用空心圆圈表示。一个测序克隆为一行。
Figure 1. Comparison of Methylation modification of CpG islands in cerebral cortex and hippocampus between saline treated group and MA treated group
图 2 生理盐水处理组和MA处理组大脑皮质和海马组织CpG岛甲基化修饰对比
A:生理盐水处理组和MA处理组海马组织基因组Dusp1启动子BSP测序结果;B:生理盐水处理组和MA处理组海马组织基因组Eln启动子BSP测序结果,在海马组织中Eln(P = 0.063)。甲基化的CpG位点用实心圆圈表示、非甲基化的CpG位点用空心圆圈表示。一个测序克隆为一行。
Figure 2. Comparison of CpG island Methylation modifications in hippocampal tissues between the saline group and the MA treatment group
表 1 BSP引物表(5′→3′)
Table 1. Primer list for BSP (5′→3′)
基因 正向引物 反向引物 Fos GTGGGTAAGTTTTATTTTAGGA TAAAAAATCTCCTAAACCTTCC Arc GTATATTGTGTGGTTAGGATGG TAAAACCCTAACTCCCATTAAC Egr4 AATAAATTGGTATTAGGTGGGAAT CAATCCCCCCACTTATATAACTA Egr2 TTTAGTTTGGGTAGGGAAGAAA CTAACTTCCCTACTCCCCATT Dusp1 GGTGGGAATTAATTGGAAGTAT CACCCTCCTATCCTCTAAACTC Eln AGGAGGTTTGTAAGTTTGGTTTT AAATTCCCCATCAATCTTACC -
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