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In vivo neurotrophic effects of GDNF on neonatal and adult facial motor neurons.

机译:GDNF对新生儿和成人面部运动神经元的体内神经营养作用。

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Motor neurons require neurotrophic factor(s) for their survival during development and for maintenance of function in adulthood. In vivo studies have shown that motor neurons respond to a variety of molecules, including ciliary neurotrophic factor, members of the neurotrophin family, and the insulin growth factor IGF-1 (refs 3-13). Here we investigate the potential motor neuron neurotrophic effects of glial-cell-line-derived neurotrophic factor (GDNF), initially identified as a neurotrophic factor for substantia nigra dopaminergic neurons. We find that GDNF is retrogradely transported, in a receptor-mediated fashion, by spinal cord motor neurons in neonatal rats. Local application of GDNF to the transected facial nerve prevents the massive motor neuron cell death and atrophy that normally follows axotomy in the neonatal period. In adult rats, GDNF administered locally or systemically can markedly attenuate the lesion-induced decrease of choline acetyltransferase immunoreactivity in the facial nucleus. Our data indicate that GDNF has very profound neurotrophic effects in vivo on developing as well as on adult motor neurons, and is the most potent motor neuron trophic factor found so far.
机译:运动神经元需要神经营养因子才能在发育过程中存活并维持成年期的功能。体内研究表明,运动神经元对多种分子有反应,包括睫状神经营养因子,神经营养蛋白家族成员和胰岛素生长因子IGF-1(参考文献3-13)。在这里,我们调查神经胶质细胞系神经营养因子(GDNF)的潜在运动神经元神经营养作用,该因子最初被确定为黑质多巴胺能神经元的神经营养因子。我们发现GDNF是通过新生大鼠中的脊髓运动神经元以受体介导的方式逆行转运的。 GDNF在横断面神经上的局部应用可防止通常在新生儿期切开后发生的大规模运动神经元细胞死亡和萎缩。在成年大鼠中,局部或全身给药的GDNF可以显着减轻病变引起的面核中胆碱乙酰转移酶免疫反应性的降低。我们的数据表明,GDNF在体内对发育以及成人运动神经元具有非常深远的神经营养作用,并且是迄今为止发现的最有效的运动神经元营养因子。

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