Neuron‐type specific cannabinoid‐mediated G protein signalling in mouse hippocampus

Neuron‐type specific cannabinoid‐mediated G protein signalling in mouse hippocampus
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小鼠海马神经元类型特异性大麻素介导的 G 蛋白信号传导

DOI:
10.1111/jnc.12137
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发表时间:
2013
影响因子:
4.7
通讯作者:
Monory K
Monory K
中科院分区:
医学2区
文献类型:
--
作者:
Steindel F;Lerner R;Häring M;Ruehle S;Marsicano G;Lutz B;Monory K

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1型大麻素受体(CB1)在哺乳动物大脑的不同神经元群中表达。特别是,CB1对gaba能或谷氨酸能神经元在体内发挥不同的功能并表现出不同的药理特性。这表明存在由不同CB1亚群激活的神经元类型特异性信号通路。在这项研究中,我们分析了GABA能(GABA‐CB1‐KO小鼠)或皮质谷氨酸能神经元(Glu‐CB1‐KO小鼠)中CB1缺失的条件突变小鼠海马中CB1的表达、结合和信号传导。与野生型小鼠相比,Glu‐CB1‐KO小鼠CB1 mRNA的数量、免疫反应性和[³H]CP55,940结合水平均略有下降。相反,GABA‐CB1‐KO小鼠显示这些参数急剧降低,证实CB1在海马GABA能中间神经元上的密度比谷氨酸能神经元高得多。然而,令人惊讶的是,HU210刺激的[35S] gtp - γ - s结合的饱和分析表明,“谷氨酸能”CB1比“gaba能”CB1更有效地与G蛋白信号结合。因此,与“gaba能”CB1相比,谷氨酸能神经元上的少数CB1与G蛋白信号的耦合强度要高几倍,这是自相矛盾的。这种选择性信号传导机制提出了设计新型大麻素配体的可能性,该配体仅激活CB1刺激的一小部分生理效应,从而优化治疗作用。
Type 1 cannabinoid receptor (CB1) is expressed in different neuronal populations in the mammalian brain. In particular, CB1 on GABAergic or glutamatergic neurons exerts different functions and display different pharmacological propertiesin vivo. This suggests the existence of neuron‐type specific signalling pathways activated by different subpopulations of CB1. In this study, we analysed CB1 expression, binding and signalling in the hippocampus of conditional mutant mice, bearing CB1 deletion in GABAergic (GABA‐CB1‐KO mice) or cortical glutamatergic neurons (Glu‐CB1‐KO mice). Compared to their wild‐type littermates, Glu‐CB1‐KO displayed a small decrease of CB1 mRNA amount, immunoreactivity and [³H]CP55,940 binding. Conversely, GABA‐CB1‐KO mice showed a drastic reduction of these parameters, confirming that CB1 is present at much higher density on hippocampal GABAergic interneurons than glutamatergic neurons. Surprisingly, however, saturation analysis of HU210‐stimulated [35S]GTPγS binding demonstrated that ‘glutamatergic’ CB1 is more efficiently coupled to G protein signalling than ‘GABAergic’ CB1. Thus, the minority of CB1 on glutamatergic neurons is paradoxically several fold more strongly coupled to G protein signalling than ‘GABAergic’ CB1. This selective signalling mechanism raises the possibility of designing novel cannabinoid ligands that differentially activate only a subset of physiological effects of CB1 stimulation, thereby optimizing therapeutic action.
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发表时间: 2003-01-01
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影响因子: --
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DOI: --
发表时间: 1997
期刊: The Journal of pharmacology and experimental therapeutics
影响因子: --
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