Studies on the pleiotropic effects of gaseous chemical compound on the function of the central nervous system.

研究气态化合物对中枢神经系统功能的多效性影响。

基本信息

项目摘要

In this research, we investigated the effects of 1-bromopropane (1-BP), a substitute for chlorofluorocarbons, on the function of the central nervous system (CNS). We found that 1-BP directly potentiated the function of GABA_A receptors, but inhibited neuronal nicotinic acetylcholine receptors, respectively, from the experiments using Xenopus oocytes expression system. 1-BP also enhanced paired-pulse inhibition (PPI) of population spike (PS) amplitudes in the study using rat hippocampal slice preparations, suggesting an anesthetic effect of 1-BP. However, when the rats were exposed to 1-BP vapor subchronically, the decrease in PPI of PS amplitudes, i.e.disinhibition which was opposite to the direct effect of 1-BP mentioned above, was observed in the hippocampus, and this disinhibition occurred in the dentate gyrus more predominantly than CA1 area. RT-PCR analysis indicated decreased mRNA levels of GABA_A receptor β3 and δ subunits - the components of extrasynaptic GABA_A receptors - in the hippocampus of 1-BP-exposed rats. Moreover, both in vitro and in vivo experiments revealed that 1-BP altered mRNA levels of BDNF, a neurotrophic factor and Bcl-xL, an anti-apoptotic molecule, which was probably due to the inhibition of CREB and NF-κB activation, respectively. These results demonstrate that 1-BP may alter neuronal excitability via different mechanisms, which requires further investigation to be clarified.On the other hand, we examined bromide (Br-) concentrations in the brain obtained from 1-BP-exposed rats, to determine the one compartment model for time-dependent changes of Br- concentrations caused by 1-BP inhalation. In consequence, this model, together with our experimental observations, would describe a risk assessment for the CNS neurotoxicity induced by 1-BP exposure, which also suggests that Br- concentration in the blood and/or urine sample would be a useful chemical-indicator of 1-BP inhalation.
在本研究中,我们研究了1-溴丙烷(1-BP)对中枢神经系统(CNS)功能的影响。在非洲爪哇卵母细胞表达系统的实验中,我们发现1-BP直接增强了GABA_A受体的功能,而抑制了神经元烟碱型乙酰胆碱受体的功能。在使用大鼠海马片的研究中,1-BP还增强了群体峰电位(PS)幅度的成对脉冲抑制(PPI),表明1-BP具有麻醉作用。然而,亚慢性暴露于1-BP蒸气时,可在海马区观察到PS波幅PPI的降低,即与上述1-BP的直接作用相反的去抑制作用,这种去抑制作用主要发生在齿状回,而不是CA1区。逆转录聚合酶链式反应分析显示,1-BP暴露的大鼠海马区GABAA受体β3和δ亚单位-突触外GABAA受体的组成成分-的基因表达水平降低。此外,体外和体内实验均表明,1-BP可改变神经营养因子BDNFmRNA和抗细胞凋亡分子BclxLmRNA的表达,其机制可能分别与抑制CREB和NF-κB的激活有关。这些结果表明,1-BP可能通过不同的机制改变神经元的兴奋性,这需要进一步的研究。另一方面,我们检测了1-BP暴露大鼠脑内的溴(BR-)浓度,以确定1-BP吸入引起的BR-浓度随时间变化的单室模型。因此,这个模型结合我们的实验观察,将描述1-BP暴露引起的中枢神经毒性的风险评估,这也表明血液和/或尿样中的BR-浓度将是1-BP吸入的有用的化学指标。

项目成果

期刊论文数量(16)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Changes in the function of the inhibitory neurotransmitter system following subchronic inhalation exposure to 1-bromopropane.
亚慢性吸入暴露于 1-溴丙烷后抑制性神经递质系统功能的变化。
Electrophysiology and immunohistochemistry in the hippocampal CA1 and the dentate gyrus of rats chronically exposed to 1-bromopropane, a substitute for specific chlorofluorocarbons
  • DOI:
    10.1016/j.neuroscience.2003.12.025
  • 发表时间:
    2004-01-01
  • 期刊:
  • 影响因子:
    3.3
  • 作者:
    Fueta, Y;Fukuda, T;Hori, H
  • 通讯作者:
    Hori, H
Sites of positive allosteric modulation by neurosteroids on ionotropic γ-aminobutyric acid receptor subunits
神经类固醇对离子型 γ-氨基丁酸受体亚基的正变构调节位点
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Ueno S.;et al.
  • 通讯作者:
    et al.
大学における室内環境中のVOC濃度
大学室内环境VOC浓度
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Tanaka N.;Nejime N.;Kagota S.;Kubota Y.;Nakamura K.;Kunitomo M.;Hashimoto M.;Yamamoto R.;Shinozuka K.;石田尾 徹 他
  • 通讯作者:
    石田尾 徹 他
New approach to risk assessment of central neurotoxicity induced by 1-bromopropane using animal models
  • DOI:
    10.1016/j.neuro.2006.05.003
  • 发表时间:
    2007-03-01
  • 期刊:
  • 影响因子:
    3.4
  • 作者:
    Fueta, Yukiko;Ishidao, Toru;Hori, Hajime
  • 通讯作者:
    Hori, Hajime
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UENO Susumu其他文献

UENO Susumu的其他文献

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{{ truncateString('UENO Susumu', 18)}}的其他基金

Developmental neurotoxicity of volatile organic compounds: the evaluation of social behaviors and the developing of biomarkers
挥发性有机化合物的发育神经毒性:社会行为的评估和生物标志物的开发
  • 批准号:
    23510084
  • 财政年份:
    2011
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Examining Management and Cost Accounting Systems and Processes: International Comparative Studies
检查管理和成本会计系统和流程:国际比较研究
  • 批准号:
    21530489
  • 财政年份:
    2009
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Effects of prenatal chemical substance exposure on the neurofunctions at the stage of CNS formation and neurobehavior at juvenile period.
产前化学物质暴露对中枢神经系统形成期神经功能和青少年期神经行为的影响。
  • 批准号:
    20591237
  • 财政年份:
    2008
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

相似海外基金

Investigation on neurodegenerative effect of 1-bromopropane using new biomarkers
使用新生物标志物研究 1-溴丙烷的神经退行性作用
  • 批准号:
    24406018
  • 财政年份:
    2012
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Investigation on toxicity of 1-bromopropane to central nervous system and hematopoetic function in humans
1-溴丙烷对人体中枢神经系统和造血功能的毒性研究
  • 批准号:
    21406017
  • 财政年份:
    2009
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on dose-dependency of the central nervous system toxicity of 1-bromopropane in humans
1-溴丙烷对人体中枢神经系统毒性的剂量依赖性研究
  • 批准号:
    17406017
  • 财政年份:
    2005
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Brain slice techniques as neurotoxicity tests for 1-bromopropane
脑切片技术作为 1-溴丙烷的神经毒性测试
  • 批准号:
    12680556
  • 财政年份:
    2000
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on mechanism of reproductive toxicity and neurotoxicity of 1-bromopropane, a new alternative to chlorofluorocarbons
氯氟烃新替代品1-溴丙烷生殖毒性和神经毒性机制研究
  • 批准号:
    11670367
  • 财政年份:
    1999
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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