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首页> 外文期刊>Neuron >Peripheral NT3 signaling is required for ETS protein expression and central patterning of proprioceptive sensory afferents.
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Peripheral NT3 signaling is required for ETS protein expression and central patterning of proprioceptive sensory afferents.

机译:ETS蛋白表达和本体感受性感觉传入传入的中心模式需要外围NT3信号传导。

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摘要

To study the role of NT3 in directing axonal projections of proprioceptive dorsal root ganglion (DRG) neurons, NT3(-/-) mice were crossed with mice carrying a targeted deletion of the proapoptotic gene Bax. In Bax(-/-)/NT3(-/-) mice, NT3-dependent neurons survived and expressed the proprioceptive neuronal marker parvalbumin. Initial extension and collateralization of proprioceptive axons into the spinal cord occurred normally, but proprioceptive axons extended only as far as the intermediate spinal cord. This projection defect is similar to the defect in mice lacking the ETS transcription factor ER81. Few if any DRG neurons from Bax(-/-)/NT3(-/-) mice expressed ER81 protein. Expression of a NT3 transgene in muscle restored DRG ER81 expression in NT3(-/-) mice. Finally, addition of NT3 to DRG explant cultures resulted in induction of ER81 protein. Our data indicate that NT3 mediates the formation of proprioceptive afferent-motor neuron connections via regulation of ER81.
机译:为了研究NT3在指导本体感受性背根神经节(DRG)神经元的轴突投射中的作用,将NT3(-/-)小鼠与携带凋亡原基因Bax的靶向缺失的小鼠杂交。在Bax(-/-)/ NT3(-/-)小鼠中,NT3依赖性神经元存活并表达本体感受神经元标记小白蛋白。本体感受性轴突最初延伸和抵押进入脊髓通常发生,但是本体感受性轴突仅延伸到中间脊髓。这种投射缺陷类似于缺乏ETS转录因子ER81的小鼠的缺陷。来自Bax(-/-)/ NT3(-/-)小鼠的DRG神经元很少表达ER81蛋白。 NT3转基因在肌肉中的表达恢复了NT3(-/-)小鼠的DRG ER81表达。最后,向DRG外植体培养物中添加NT3导致了ER81蛋白的诱导。我们的数据表明,NT3通过调节ER81介导本体感受传入运动神经元连接的形成。

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