Carbon nanotubes can carry protein into cells to induce biological effects. Amino-functionalized carbon nanotubes are soluble and biocompatible, have high reactivity and low toxicity, and can help promote nerve cell g...Carbon nanotubes can carry protein into cells to induce biological effects. Amino-functionalized carbon nanotubes are soluble and biocompatible, have high reactivity and low toxicity, and can help promote nerve cell growth. In this study, amino-functionalized ethylenediamine-treated multi-walled carbon nanotubes were used to prepare carbon nanotubes-nerve growth factor complexes by non-covalent grafting. The physicochemical properties, cytotoxicity to PC12 and chick embryo dorsal root ganglion, and biological activity of the carbon nanotubes-nerve growth factor complexes were investigated. The results showed that amino functionalization improved carbon nanotubes-nerve growth factor complex dispersibility, reduced their toxicity to PC12 cells, and promoted PC 12 cell differentiation and chick embryo dorsal root ganglion.展开更多
文摘目的检测舌下神经压榨损伤前后及神经生长因子(NGF)干预后磷酸化p38MAPK的表达,探讨p38MAPK在大鼠舌下神经损伤及干预后的作用和NGF对大鼠舌下神经损伤后神经修复再生的作用。方法 60只SD大鼠随机分为正常对照组(NC组)、实验对照组(NS组)和NGF治疗组(NGF组),动物存活时间分别为1、3、5、7和14 d。分别于各时间点取脑干做免疫组化测定及Nissl染色,取神经干做透射电镜观察。结果舌下神经压榨损伤后,舌下神经核内磷酸化p38MAPK免疫阳性神经元数目和染色深度均增加(P<0.05)。NGF干预后舌下神经核内磷酸化p38MAPK免疫阳性神经元数目和染色深度均明显减少(P<0.05)。Nissl染色显示,术后7、14 d NGF组损伤侧舌下神经核内运动神经元存活率明显高于NS组。透射电镜观察NGF组神经干形态优于NS组。结论大鼠舌下神经压榨损伤后受损神经元p38MAPK的活性增强;外源性NGF能抑制大鼠舌下神经压榨损伤引起的舌下神经核运动神经元p38MAPK的激活;大鼠舌下神经压榨损伤后外源性NGF具有保护受损的舌下神经元及促进神经再生的作用。
基金the National Natural Science Foundation of China,No.81160395
文摘Carbon nanotubes can carry protein into cells to induce biological effects. Amino-functionalized carbon nanotubes are soluble and biocompatible, have high reactivity and low toxicity, and can help promote nerve cell growth. In this study, amino-functionalized ethylenediamine-treated multi-walled carbon nanotubes were used to prepare carbon nanotubes-nerve growth factor complexes by non-covalent grafting. The physicochemical properties, cytotoxicity to PC12 and chick embryo dorsal root ganglion, and biological activity of the carbon nanotubes-nerve growth factor complexes were investigated. The results showed that amino functionalization improved carbon nanotubes-nerve growth factor complex dispersibility, reduced their toxicity to PC12 cells, and promoted PC 12 cell differentiation and chick embryo dorsal root ganglion.