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EFFECTS OF BRAIN-DERIVED NEUROTROPHIC FACTOR ON OPTIC AXON BRANCHING AND REMODELLING IN VIVO

机译:脑源性神经营养因子对体内视轴突分支和重塑的影响

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NEUROTROPHINS are thought to be important for the survival and differentiation of vertebrate neurons(1). Roles have been suggested for target-derived neurotrophins, based both on their expression in target tissues at the time of neuron innervation(2,3), and on their effects on axonal sprouting(4-6). However, direct in vivo evidence of their involvement in axon arborization has remained elusive. We have used in vivo microscopy to follow individual optic axons over time, and have examined the role of the neurotrophin brain-derived neurotrophic factor (BDNF) in their development. Here we show that injection of BDNF into the optic tectum of live Xenopus laevis tadpoles increased the branching and complexity of optic axon terminal arbors. In contrast, injection of specific neutralizing antibodies to BDNF reduced axon arborization and complexity. The onset of these effects was rapid (within 2 hours) and persisted throughout the 24-hour observation period. Other neurotrophins had little or no significant effects. These results demonstrate the involvement of neurotrophins in the dynamic elaboration of axon terminals, and suggest a direct role for target-derived BDNF during synaptic patterning in the developing central nervous system. [References: 30]
机译:神经营养素被认为对于脊椎动物神经元的存活和分化很重要(1)。根据它们在神经元神经支配时在靶组织中的表达及其对轴突萌发的影响(4-6),已经提出了靶源性神经营养蛋白的作用。但是,有关它们参与轴突乔化的直接体内证据仍然难以捉摸。我们已经使用体内显微镜观察随时间推移的各个视神经轴突,并检查了神经营养蛋白脑源性神经营养因子(BDNF)在其发育中的作用。在这里,我们表明将BDNF注入活爪蟾t的视神经皮层会增加视轴突末端树突的分支和复杂性。相反,针对BDNF的特异性中和抗体的注射减少了轴突的树突化和复杂性。这些作用的发作是迅速的(在2小时内),并在整个24小时的观察期内持续存在。其他神经营养蛋白几乎没有或没有明显的作用。这些结果表明神经营养蛋白参与轴突末端的动态加工,并建议在发展中的中枢神经系统的突触模式期间目标衍生的BDNF的直接作用。 [参考:30]

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