Effect Of combining FK506 and neurotrophins on neurite branching and elongation.

Effect Of combining FK506 and neurotrophins on neurite branching and elongation.
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DOI:
10.1002/mus.25370
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发表时间:
2017-04
期刊:
影响因子:
3.4
通讯作者:
Agarwal J
Agarwal J
中科院分区:
医学3区
文献类型:
--
作者:
Labroo P;Shea J;Sant H;Gale B;Agarwal J

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临床需要改善损伤后周围神经再生和修复的结果。除了其免疫抑制作用外,FK506(他克莫司)已被证明具有神经再生特性。为了确定生物学相关的局部 FK506 和生长因子浓度,我们使用鸡胚胎的背根神经节 (DRG) 进行了体外生物测定。添加FK506、神经胶质细胞源性神经营养因子(GDNF)和神经生长因子(NGF)(单独或组合)后,通过显微镜分析神经突伸长和神经突分支。 FK506 诱导适度的神经突伸长(~500-800 μm),但没有显着改善神经突分支。 FK506 与 NGF、GDNF 或两者的组合,根据剂量和对神经突分支的竞争效应 (~0.2-0.4),对神经突伸长 (~700-1100 μm) 产生增强或竞争作用。这些结果强烈表明 FK506 与 GDNF 和 NGF 的相互作用介导神经突生长的明显增强。
There is a clinical need to improve the outcomes of peripheral nerve regeneration and repair after injury. In addition to its immunosuppressive effects, FK506 (tacrolimus) has been shown to have neuroregenerative properties. To determine biologically relevant local FK506 and growth factor concentrations, we performed an in vitro bioassay using dorsal root ganglion (DRG) from chicken embryos. Neurite elongation and neurite branching were analyzed microscopically after addition of FK506, glial cell line-derived neurotrophic factor (GDNF), and nerve growth factor (NGF), each alone and in combination. FK506 induced modest neurite elongation (~500–800 μm) without improving neurite branching significantly. The combination of FK506 with NGF, GDNF, or both, exerted a potentiating or competitive effect on neurite elongation (~700–1100 μm) based on dosage and competitive effect on neurite branching (~0.2–0.4). These results strongly suggest that the interaction of FK506 with GDNF and NGF mediates distinct enhancement of neurite growth.
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