Reconfiguration of respiratory-related population activity in a rostrally tilted transversal slice preparation following blockade of inhibitory neurotransmission in neonatal rats

Reconfiguration of respiratory-related population activity in a rostrally tilted transversal slice preparation following blockade of inhibitory neurotransmission in neonatal rats
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新生大鼠抑制性神经传递阻断后头侧倾斜横向切片制剂中呼吸相关群体活动的重新配置

DOI:
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发表时间:
2008
期刊:
Pflügers Archiv: European Journal of Physiology
影响因子:
--
通讯作者:
M. Dutschmann
M. Dutschmann
中科院分区:
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文献类型:
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作者:
Frank Funke;Michael Müller;M. Dutschmann

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最近的研究表明,呼吸节律的产生取决于位于前BötC复合体(pre-BötC)和旁面呼吸群(pFRG)中的振荡器。为了研究这两个振荡器之间的抑制性突触相互作用,我们开发了一种嘴侧倾斜的横向切片制备,它保留了这些区域。在后斜方核(RTN)/pFRG的节律性集体活动的发病先于前BötC。阻断甘氨酸能和γ-氨基丁酸抑制使前BötC和RTN/pFRG活性同步,并显著增加前BötC爆发频率、振幅和持续时间。群体成像显示吸气样神经元的招聘,而呼气样神经元失去了他们的阶段性活动。解除抑制后的重构揭示:(1)RTN/pFRG引起的前BötC的突触抑制,(2)RTN/pFRG的兴奋驱动触发前BötC爆发。我们的研究结果支持这样的观点,即这些突触相互作用在体外涉及到吸气相的启动或在体内的呼气-吸气相转变的转向。
Recent studies showed that respiratory rhythm generation depends on oscillators located in the pre-Bötzinger complex (pre-BötC) and the parafacial respiratory group (pFRG). To study inhibitory synaptic interactions between these two oscillators, we developed a rostrally tilted transversal slice preparation, which preserves these regions. The onset of rhythmic mass activity in the retrotrapezoid nucleus (RTN)/pFRG preceded that of the pre-BötC. Blockade of glycinergic and gamma-aminobutyric acidic inhibition synchronized pre-BötC and RTN/pFRG activity and significantly increased pre-BötC burst frequency, amplitude, and duration. Population imaging revealed recruitment of inspiratory-like neurones, while expiratory-like neurones lost their phasic activity. The reconfiguration after disinhibition reveals: (1) synaptic inhibition of the pre-BötC arising from the RTN/pFRG, (2) excitatory drive from the RTN/pFRG that triggers the pre-BötC burst. Our findings support the view that these synaptic interactions in vitro relate to the initiation of the inspiratory phase or to the steering of the expiratory–inspiratory phase transition in vivo.
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