Cytosolic phospholipase A2 alpha/arachidonic acid signaling mediates depolarization-induced suppression of excitation in the cerebellum.

Cytosolic phospholipase A2 alpha/arachidonic acid signaling mediates depolarization-induced suppression of excitation in the cerebellum.
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胞浆磷脂酶 A2 α/花生四烯酸信号传导介导去极化诱导的小脑兴奋抑制

DOI:
10.1371/journal.pone.0041499
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Shen Y
Shen Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang DJ;Yang D;Su LD;Xie YJ;Zhou L;Sun CL;Wang Y;Wang XX;Zhou L;Shen Y

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研究背景平行纤维-浦肯野细胞突触的去极化诱导的兴奋抑制(DSE)是内源性大麻素介导的短时程逆行可塑性。细胞内Ca 2+升高对内源性大麻素的产生和DSE至关重要。然而,Ca 2+升高如何导致DSE尚不清楚。方法/主要发现我们利用胞浆型磷脂酶A2 α(cPLA 2 α)基因敲除小鼠和小脑脑片全细胞膜片钳技术观察cPLA 2 α/花生四烯酸信号对平行纤维-浦肯野细胞突触DSE的作用。我们的数据显示,在cPLA 2 α基因敲除小鼠中,DSE被显著抑制,花生四烯酸对其进行了拯救。花生四烯酸酰甘油(2-AG)的降解酶单酰基甘油脂肪酶(MAGL)阻断DSE,而N-花生四烯酸酰乙醇胺(AEA)的催化酶脂肪酸酰胺水解酶(FAAH)不影响DSE。这些结果表明,2-AG是负责在浦肯野细胞DSE。联合应用paxilline可逆转内源性K+对DSE的阻断作用,表明大电导钙激活钾通道(BK)可抑制cPLA 2 α/花生四烯酸介导的DSE。此外,我们发现2-AG的释放不依赖于可溶性NSF附着蛋白受体(SNARE)、蛋白激酶C和蛋白激酶A。结论/意义我们的数据首次表明cPLA 2 α/花生四烯酸/2-AG信号通路介导了平行纤维-浦肯野细胞突触的DSE。
Background Depolarization-induced suppression of excitation (DSE) at parallel fiber-Purkinje cell synapse is an endocannabinoid-mediated short-term retrograde plasticity. Intracellular Ca2+ elevation is critical for the endocannabinoid production and DSE. Nevertheless, how elevated Ca2+ leads to DSE is unclear. Methodology/Principal Findings We utilized cytosolic phospholipase A2 alpha (cPLA2α) knock-out mice and whole-cell patch clamp in cerebellar slices to observed the action of cPLA2α/arachidonic acid signaling on DSE at parallel fiber-Purkinje cell synapse. Our data showed that DSE was significantly inhibited in cPLA2α knock-out mice, which was rescued by arachidonic acid. The degradation enzyme of 2-arachidonoylglycerol (2-AG), monoacylglycerol lipase (MAGL), blocked DSE, while another catabolism enzyme for N-arachidonoylethanolamine (AEA), fatty acid amide hydrolase (FAAH), did not affect DSE. These results suggested that 2-AG is responsible for DSE in Purkinje cells. Co-application of paxilline reversed the blockade of DSE by internal K+, indicating that large conductance Ca2+-activated potassium channel (BK) is sufficient to inhibit cPLA2α/arachidonic acid-mediated DSE. In addition, we showed that the release of 2-AG was independent of soluble NSF attachment protein receptor (SNARE), protein kinase C and protein kinase A. Conclusions/Significance Our data first showed that cPLA2α/arachidonic acid/2-AG signaling pathway mediates DSE at parallel fiber-Purkinje cell synapse.
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发表时间: 2006-05-17
期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
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通讯作者: Häusser M
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期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
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DOI: 10.1016/j.neuron.2004.12.045
发表时间: 2005-02-03
期刊: NEURON
影响因子: 16.2
作者:
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