首页> 美国卫生研究院文献>The Journal of Neuroscience >Basic Fibroblast Growth Factor Increases Functional L-Type Ca2+ Channels in Fetal Rat Hippocampal Neurons: Implications for Neurite Morphogenesis In Vitro
【2h】

Basic Fibroblast Growth Factor Increases Functional L-Type Ca2+ Channels in Fetal Rat Hippocampal Neurons: Implications for Neurite Morphogenesis In Vitro

机译:基本的成纤维细胞生长因子增加胎鼠海马神经元中的功能性L型Ca2 +通道:体外神经突形态发生的影响。

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Basic fibroblast growth factor (bFGF) is a potent neurotrophic factor that regulates cell proliferation and differentiation during neuronal development. Here we report that fetal hippocampal neurons chronically treated with bFGF displayed larger [Ca2+]i increases than nontreated neurons in response to high K+-induced depolarization. This [Ca2+]i response was abolished by nicardipine and was little affected by treatments that depleted intracellular Ca2+ stores, thus reflecting the activities of L-type voltage-dependent Ca2+ channels. Whole-cell recordings also demonstrated increased high-voltage-activated Ca2+ currents in bFGF-treated neurons, whereas low-voltage-activated Ca2+currents remained unchanged. bFGF-stimulated increase in Ca2+ response was not observed in neurons treated with cycloheximide or actinomycin D, indicating that protein and RNA synthesis were required for this effect. Visualization using a fluorescent dihydropyridine analog revealed that bFGF-treated neurons expressed increased amounts of L-type Ca2+ channels on the cell body. In addition, bFGF-treated neurons acquired distinctive morphology of neurites that was characterized by markedly increased neuritic branching. The branching points in neurites were associated with clusters of L-type Ca2+ channels and resultant “Ca2+ hotspots” that showed large [Ca2+]i increases in response to membrane depolarization. Concurrent application of nicardipine completely blocked the bFGF-stimulated increase in neuritic branching. Therefore, bFGF enhances the expression of functional L-type Ca2+channels on the cell body and neurites of fetal hippocampal neurons, which may play an important role in the regulation of their differentiation and the establishment of their neurite morphology.
机译:碱性成纤维细胞生长因子(bFGF)是一种有效的神经营养因子,可调节神经元发育过程中的细胞增殖和分化。在这里,我们报道了长期接受bFGF治疗的胎儿海马神经元显示出比未处理的神经元更大的[Ca 2 + ] i增加,这是由于高K + 引起的去极化所致。尼卡地平取消了[Ca 2 + ] i反应,并且几乎没有受到细胞内Ca 2 + 储存耗尽的治疗的影响,从而反映了L型电压的活性。依赖的Ca 2 + 通道。全细胞记录还表明,经bFGF处理的神经元中高压激活的Ca 2 + 电流增加,而低压激活的Ca 2 + 电流保持不变。在用环己酰亚胺或放线菌素D处理的神经元中未观察到bFGF刺激的Ca 2 + 反应的增加,表明该作用需要蛋白质和RNA的合成。使用荧光二氢吡啶类似物的可视化显示,bFGF处理的神经元在细胞体上表达增加的L型Ca 2 + 通道数量。此外,bFGF处理的神经元获得了独特的神经突形态,其特征是神经分支明显增加。神经突中的分支点与L型Ca 2 + 通道的簇和相关的“ Ca 2 + 热点”相关,这些区域显示出较大的[Ca 2 + 响应于膜去极化,i增加。并用尼卡地平可完全阻断bFGF刺激的神经分支的增加。因此,bFGF增强了胎儿海马神经元细胞体和神经突中L型Ca 2 + 通道的表达,这可能在调控其分化和建立它们的过程中起重要作用。神经突形态。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号