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首页> 外文期刊>The European Journal of Neuroscience >Nicotine regulates 5-HT(1A) receptor gene expression in the cerebral cortex and dorsal hippocampus.
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Nicotine regulates 5-HT(1A) receptor gene expression in the cerebral cortex and dorsal hippocampus.

机译:尼古丁调节大脑皮层和背侧海马中的5-HT(1A)受体基因表达。

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The 5-HT(1A) receptor has previously been shown to be important in mediating the behavioural effects of nicotine. It is possible that nicotine administration might regulate the levels of 5-HT receptors in limbic and cortical regions, and such regulations may underlie adaptive responses to nicotine in the central nervous system. The effects of acute and chronic systemic (--)-nicotine administration on 5-HT(1A) receptor gene expression were measured by in situ hybridization, in the rat cerebral cortex, dorsal hippocampus and lateral septum. In the cortex, acute nicotine (0.5 mg/kg i.p.) significantly increased the expression of 5-HT(1A) receptor mRNA 2 h and 24 h after injection. Similarly, acute nicotine significantly increased 5-HT(1A) receptor mRNA in the dentate gyrus (DG), CA3 and CA1 regions of the dorsal hippocampus 2 h and 24 h after injection. Acute nicotine was without effect in the lateral septum. Chronic nicotine (0.5 mg/kg i.p; twice daily for 7 days) significantly decreased 5-HT(1A) receptor mRNA in the cortex 2 h after the final injection, but was without effect at 24 h or 72 h. Chronic nicotine caused no changes in 5-HT(1A) mRNA in the lateral septum or dorsal hippocampus. These data demonstrate that nicotine regulates 5-HT(1A) receptor gene expression in the cortex and hippocampus. The rapid regulation of expression of 5-HT(1A) receptor mRNA leads to the hypothesis that nicotine-induced 5-HT release may alter the postsynaptic sensitivity to 5-HT.
机译:先前已显示5-HT(1A)受体在介导尼古丁的行为影响中很重要。尼古丁的施用可能会调节边缘和皮质区域的5-HT受体水平,而此类调节可能是中枢神经系统对尼古丁适应性反应的基础。通过原位杂交,在大鼠大脑皮层,背侧海马和外侧隔中测量了急性和慢性全身(-)-烟碱对5-HT(1A)受体基因表达的影响。在皮层中,注射后2 h和24 h,急性尼古丁(0.5 mg / kg i.p.)显着增加5-HT(1A)受体mRNA的表达。同样,注射后2 h和24 h,急性尼古丁会显着增加背海马的齿状回(DG),CA3和CA1区的5-HT(1A)受体mRNA。急性尼古丁对外侧隔没有影响。慢性尼古丁(0.5 mg / kg腹膜内注射;每天两次,共7天)在最终注射后2小时显着降低了皮质中的5-HT(1A)受体mRNA,但在24 h或72 h无效。慢性尼古丁在外侧中隔或背侧海马中未引起5-HT(1A)mRNA的变化。这些数据表明尼古丁调节皮层和海马中的5-HT(1A)受体基因表达。 5-HT(1A)受体mRNA表达的快速调节导致这一假设,即尼古丁引起的5-HT释放可能会改变突触后对5-HT的敏感性。

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