首页> 外文期刊>The European Journal of Neuroscience >Direct measurement of local raised subplasmalemmal calcium concentrations in growth cones advancing on an N-cadherin substrate.
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Direct measurement of local raised subplasmalemmal calcium concentrations in growth cones advancing on an N-cadherin substrate.

机译:直接测量在N-钙粘着蛋白底物上生长的视锥细胞中局部升高的浆膜下钙浓度。

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We have used the membrane-localized calcium probe fura-piperazine-C12H25 (FFP-18) to examine cytosolic calcium concentrations in a volume close to the plasmalemma. Although promotion of axon outgrowth by cell adhesion molecules requires extracellular calcium and is correlated with an opening of plasmalemmal channels, conventional indicators cannot detect a change in the calcium concentration in such stimulated growth cones. We have examined calcium signalling in chick retinal ganglion cell growth cones extending along stripes of N-cadherin. Subplasmalemmal calcium concentrations, reported by FFP-18, were significantly higher in these growth cones than in neighbouring growth cones on either fibronectin or polylysine. In contrast, the bulk cytosolic calcium concentration throughout the growth cone, as measured by Fura-2, was identical in growth cones on and off the N-cadherin stripes. Our results suggest that guidance cues can use extremely local calcium signals to control pathfinding decisions.
机译:我们已经使用了膜定位的钙探针呋喃哌嗪-C12H25(FFP-18)来检查接近血浆膜的体积中的胞质钙浓度。尽管通过细胞粘附分子促进轴突生长需要细胞外钙,并且与质膜通道的开放有关,但是常规指标无法检测到这种刺激的生长锥中钙浓度的变化。我们已经检查了沿N-钙粘蛋白条纹延伸的鸡视网膜神经节细胞生长锥中的钙信号传导。在纤连蛋白或聚赖氨酸上,FFP-18报道的这些生长锥中的浆膜下钙浓度显着高于邻近的生长锥。相比之下,通过Fura-2测量,整个生长锥中的总胞质钙浓度在N-钙粘蛋白条纹上和下的生长锥中是相同的。我们的结果表明,指导线索可以使用非常局部的钙信号来控制寻路决策。

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