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首页> 外文期刊>The European Journal of Neuroscience >Altered Purkinje cell responses and calmodulin expression in the spontaneously ataxic mouse, Pogo.
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Altered Purkinje cell responses and calmodulin expression in the spontaneously ataxic mouse, Pogo.

机译:自发性共济失调的小鼠Pogo中Purkinje细胞反应和钙调蛋白表达的改变。

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摘要

Ataxia is often associated with altered cerebellar motor control, a process in which Purkinje cells (PCs) play a principal role. Pogo mice display severe motor deficits characterized by an ataxic gait accompanying hindlimb hyperextension. Here, using whole-cell patch-clamp recordings, we show that parallel fiber (PF)-excitatory post-synaptic currents (PF-EPSCs) are reduced, paired-pulse facilitation (PPF) is increased and PF-PC long-term depression (LTD) is impaired in Pogo mice; in contrast, climbing-fiber EPSCs are preserved. In control mice, treatment with the calmodulin antagonist calmidazolium (5 mum) impaired PPF and LTD. Notably, cerebellar calmodulin expression was significantly reduced in Pogo mice compared with control mice. Control PCs predominantly exhibited a tonic firing pattern, whereas the firing pattern in Pogo PCs was mainly a complex burst type. These results implicate alterations in PC responses and calmodulin content in the abnormal cerebellar function of Pogo mice.
机译:共济失调通常与小脑运动控制改变有关,在该过程中浦肯野细胞(PC)起主要作用。 Pogo小鼠表现出严重的运动功能障碍,其特征是伴随后肢过度伸展而发生的失神步态。在这里,我们使用全细胞膜片钳记录,表明平行纤维(PF)的兴奋性突触后电流(PF-EPSCs)减少,成对脉冲促进(PPF)增加,并且PF-PC长期抑郁(LTD)在Pogo小鼠中受损;相反,保留了攀爬纤维EPSC。在对照小鼠中,用钙调蛋白拮抗剂卡地咪唑(5毫克)治疗会损害PPF和LTD。值得注意的是,与对照小鼠相比,Pogo小鼠的小脑钙调蛋白表达显着降低。对照PC主要表现出强音发射模式,而Pogo PC中的发射模式主要是复杂的突发类型。这些结果暗示了Pogo小鼠异常小脑功能中PC反应和钙调蛋白含量的改变。

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