Endocytosis-dependent desensitization and protein synthesis-dependent resensitization in retinal growth cone adaptation.

Endocytosis-dependent desensitization and protein synthesis-dependent resensitization in retinal growth cone adaptation.
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DOI:
10.1038/nn1380
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发表时间:
2005-02
影响因子:
25
通讯作者:
Harris, WA
Harris, WA
中科院分区:
医学1区
文献类型:
--
作者:
Piper, M;Salih, S;Weinl, C;Holt, CE;Harris, WA

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有人提出,生长锥导航通过梯度适应基线浓度的指导线索。人们对这种适应过程知之甚少。使用崩溃分析,我们表明,非洲爪蟾视网膜生长锥的适应的指导线索Sema 3A或netrin-1涉及两个过程:一个快速的,配体特异性脱敏,发生在2分钟内曝光,是依赖于内吞作用,和一个较慢的,配体特异性的再敏化,发生在5分钟内,是依赖于蛋白质的合成。这两个适应阶段允许视网膜轴突调整其对特定指导线索的敏感度范围。
It has been proposed that growth cones navigating through gradients adapt to baseline concentrations of guidance cues. This adaptation process is poorly understood. Using the collapse assay, we show that adaptation in Xenopus laevis retinal growth cones to the guidance cues Sema3A or netrin-1 involves two processes: a fast, ligand-specific desensitization that occurs within 2 min of exposure and is dependent on endocytosis, and a slower, ligand-specific resensitization, which occurs within 5 min and is dependent upon protein synthesis. These two phases of adaptation allow retinal axons to adjust their range of sensitivity to specific guidance cues.
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