The distal end of the spinal cord and neuromuscular junction may develop secondary degeneration and damage following spinal cord injury because of the loss of neural connections. In this study, a rat model of spinal c...The distal end of the spinal cord and neuromuscular junction may develop secondary degeneration and damage following spinal cord injury because of the loss of neural connections. In this study, a rat model of spinal cord injury, established using a modified Allen's method, was injected with basic fibroblast growth factor solution via subarachnoid catheter. After injection, rats with spinal cord injury displayed higher scores on the Basso, Beattie and Bresnahan locomotor scale. Motor function was also well recovered and hematoxylin-eosin staining showed that spinal glial scar hyperplasia was not apparent. Additionally, anterior tibial muscle fibers slowly, but progressively, atrophied. Immunohistochemical staining showed that the absorbance values of calcitonin gene related peptide and acetylcholinesterase in anterior tibial muscle and spinal cord were similar, and injection of basic fibroblast growth factor increased this absorbance. Results showed that after spinal cord injury, the distal motor neurons and motor endplate degenerated. Changes in calcitonin gene related peptide and acetylcholinesterase in the spinal cord anterior horn motor neurons and motor endplate then occurred that were consistent with this regeneration. Our findings indicate that basic fibroblast growth factor can protect the endplate through attenuating the decreased expression of calcitonin gene related peptide and acetylcholinesterase in anterior horn motor neurons of the injured spinal cord.展开更多
Objective To detect the effect of excitatory amino acid (EAA) in the sec-ondary damage following spinal cord injury (SCI). Methods Glutamate (Glu) and Aspartate(Asp) on the injury site (T8) were studied using a rat SC...Objective To detect the effect of excitatory amino acid (EAA) in the sec-ondary damage following spinal cord injury (SCI). Methods Glutamate (Glu) and Aspartate(Asp) on the injury site (T8) were studied using a rat SCI model induced by Allen's weight drop method(10g×2.5cm). The result suggested that Asp and Glu were significantly increased in 10 min. Re-sults Glu was significantly decreased from 2 h to 24 h,while Asp was a little reduced in 2 h,andslightly rose in 4 h as compared with Control Group. Though elevated in 8 h, it dropped again in 24 h ascompared with Control Group. Conclusion The result indicates that the rise of EAA following SCIcould be the cause of the secondary spinal cord damage.展开更多
The incidence of spinal cord injury(SCI) has been gradually increasing, and the treatment has troubled the medical field all the time. Primary and secondary injuries ultimately lead to nerve impulse conduction block. ...The incidence of spinal cord injury(SCI) has been gradually increasing, and the treatment has troubled the medical field all the time. Primary and secondary injuries ultimately lead to nerve impulse conduction block. Microglia and astrocytes excessively accumulate and proliferate to form the glial scar. At present, to reduce the effect of glial scar on nerve regeneration is a hot spot in the research on the treatment of SCI. According to the preliminary experiments, we would like to provide a new bionic spinal cord to reduce the negative effect of glial scar on nerve regeneration. In this hypothesis we designed a new scaffold that combine the common advantage of acellular scaffold of spinal cord and thermosensitive gel, which could continue to release exogenous basic fibroblast growth factor(BFGF) in the spinal lesion area on the basis of BFGF modified thermosensitive gel. Meanwhile, the porosity, pore size and material of the gray matter and white matter regions were distinguished by an isolation layer, so as to induce the directed differentiation of cells into the defect site and promote regeneration of spinal cord tissue.展开更多
Nerve conduit is one of strategies for spine cord injury(SCI)treatment.Recently,studies showed that biomaterials could guide the neurite growth and promote axon regeneration at the injury site.However,the scaffold by ...Nerve conduit is one of strategies for spine cord injury(SCI)treatment.Recently,studies showed that biomaterials could guide the neurite growth and promote axon regeneration at the injury site.However,the scaffold by itself was difficult to meet the need of SCI functional recovery.The basic fibroblast growth factor(bFGF)administration significantly promotes functional recovery after organ injuries.Here,using a rat model of T9 hemisected SCI,we aimed at assessing the repair capacity of implantation of collagen scaffold(CS)modified by collagen binding bFGF(CBD-bFGF).The results showed that CS combined with CBD-bFGF treatment improved survival rates after the lateral hemisection SCI.The CS/CBD-bFGF group showed more significant improvements in motor than the simply CS-implanted and untreated control group,when evaluated by the 21-point Basso-Beattie-Bresnahan(BBB)score and footprint analysis.Both hematoxylin and eosin(H&E)and immunohistochemical staining of neurofilament(NF)and glial fibrillary acidic protein(GFAP)demonstrated that fibers were guided to grow through the implants.These findings indicated that administration of CS modified with CBD-bFGF could promote spinal cord regeneration and functional recovery.展开更多
目的:观察杜仲腰痛丸对大鼠脊髓损伤后炎症反应及神经元细胞形态变化的影响,探讨杜仲腰痛丸对脊髓损伤的保护作用及可能机制。方法:将50只成年SD大鼠随机分为A组、B组、C组,其中C组(药物干预)根据给药剂量不同依次分为C1组、C2组、C3组,...目的:观察杜仲腰痛丸对大鼠脊髓损伤后炎症反应及神经元细胞形态变化的影响,探讨杜仲腰痛丸对脊髓损伤的保护作用及可能机制。方法:将50只成年SD大鼠随机分为A组、B组、C组,其中C组(药物干预)根据给药剂量不同依次分为C1组、C2组、C3组,共5组,每组各10只。A组行椎板切除术(不损伤脊髓),B组和C组均建立脊髓钳夹压迫损伤模型。造模成功后,A组和B组给予0.9%氯化钠溶液灌胃,C组给予不同剂量杜仲腰痛丸药液灌胃。分别于术后第1天、第3天、第5天、第7天进行BBB(Basso,Beattie and Bresnahan)肢体运动功能评分;于术后第7天取材后采用尼氏染色以观察脊髓组织病理变化,酶联免疫吸附试验(Enzyme-linked Immunosorbent Method,ELISA)法以检测肿瘤坏死因子-β和白细胞介素-1表达。结果:BBB肢体运动功能评分比较,术后第3天起C组显著优于同期B组及A组,差异具有统计学意义(P<0.05)。尼氏染色观察比较,C组根据给药剂量由低到高瘀血面积依次减小,神经细胞水肿程度依次减轻。ELISA检测分析,与A组及B组相比较,C组血清中肿瘤坏死因子-β和白细胞介素-1含量明显减低,差异具有统计学意义(P<0.05)。结论:杜仲腰痛丸能够有效抑制脊髓损伤后炎症反应,对神经元细胞具有保护作用,促进损伤神经细胞的修复。展开更多
目的分析脊髓压迫性损伤(compressed spinal cord injury,CSCI)后脱髓鞘病变与髓鞘碱性蛋白(myelinbasic protein,MBP)、DNA结合抑制物2(inhibitor of DNA binding2,Id2)的表达变化之间的关系,以探讨CSCI脱髓鞘病变机制。方法采用自行...目的分析脊髓压迫性损伤(compressed spinal cord injury,CSCI)后脱髓鞘病变与髓鞘碱性蛋白(myelinbasic protein,MBP)、DNA结合抑制物2(inhibitor of DNA binding2,Id2)的表达变化之间的关系,以探讨CSCI脱髓鞘病变机制。方法采用自行设计的方法制作SD大鼠CSCI模型,通过锇酸染色检测CSCI后1、3、7 d有髓神经纤维变化;运用免疫荧光双标和免疫印迹(Western blot)检测MBP及Id2的表达变化。结果 CSCI后出现脱髓鞘病变,并随着压迫时间延长,髓鞘逐渐发生水肿、变性、崩解;脊髓损伤后MBP表达下调,其表达趋势与脱髓鞘溃变的严重程度一致;CSCI后,Id2广泛分布于白质,随着压迫时间延长,其表达逐渐上调。结论 Id2表达上调,并负向调控MBP基因启动子的活性,使MBP的表达下降,是CSCI后神经纤维脱髓鞘病变的机制之一。展开更多
基金supported by a grant from the Hunan Provincial Science and Technology Ministry in China, No. 2012SK3222Funding for New Teachers by the Ministry of Education in China, No. 200805331166
文摘The distal end of the spinal cord and neuromuscular junction may develop secondary degeneration and damage following spinal cord injury because of the loss of neural connections. In this study, a rat model of spinal cord injury, established using a modified Allen's method, was injected with basic fibroblast growth factor solution via subarachnoid catheter. After injection, rats with spinal cord injury displayed higher scores on the Basso, Beattie and Bresnahan locomotor scale. Motor function was also well recovered and hematoxylin-eosin staining showed that spinal glial scar hyperplasia was not apparent. Additionally, anterior tibial muscle fibers slowly, but progressively, atrophied. Immunohistochemical staining showed that the absorbance values of calcitonin gene related peptide and acetylcholinesterase in anterior tibial muscle and spinal cord were similar, and injection of basic fibroblast growth factor increased this absorbance. Results showed that after spinal cord injury, the distal motor neurons and motor endplate degenerated. Changes in calcitonin gene related peptide and acetylcholinesterase in the spinal cord anterior horn motor neurons and motor endplate then occurred that were consistent with this regeneration. Our findings indicate that basic fibroblast growth factor can protect the endplate through attenuating the decreased expression of calcitonin gene related peptide and acetylcholinesterase in anterior horn motor neurons of the injured spinal cord.
文摘Objective To detect the effect of excitatory amino acid (EAA) in the sec-ondary damage following spinal cord injury (SCI). Methods Glutamate (Glu) and Aspartate(Asp) on the injury site (T8) were studied using a rat SCI model induced by Allen's weight drop method(10g×2.5cm). The result suggested that Asp and Glu were significantly increased in 10 min. Re-sults Glu was significantly decreased from 2 h to 24 h,while Asp was a little reduced in 2 h,andslightly rose in 4 h as compared with Control Group. Though elevated in 8 h, it dropped again in 24 h ascompared with Control Group. Conclusion The result indicates that the rise of EAA following SCIcould be the cause of the secondary spinal cord damage.
基金Supported by State Key Program of National Natural Science Foundation of China,No.81330042Special Program for Sino-Russian Joint,Research Sponsored by the Ministry of Science and Technology,China,No.2014DFR31210+2 种基金Key Program Sponsored by the Tianjin Science and Technology Committee,China,No.14ZCZDSY00044National Natural Science Foundation of China,No.81201399National Natural Science Foundation of China,No.81301544
文摘The incidence of spinal cord injury(SCI) has been gradually increasing, and the treatment has troubled the medical field all the time. Primary and secondary injuries ultimately lead to nerve impulse conduction block. Microglia and astrocytes excessively accumulate and proliferate to form the glial scar. At present, to reduce the effect of glial scar on nerve regeneration is a hot spot in the research on the treatment of SCI. According to the preliminary experiments, we would like to provide a new bionic spinal cord to reduce the negative effect of glial scar on nerve regeneration. In this hypothesis we designed a new scaffold that combine the common advantage of acellular scaffold of spinal cord and thermosensitive gel, which could continue to release exogenous basic fibroblast growth factor(BFGF) in the spinal lesion area on the basis of BFGF modified thermosensitive gel. Meanwhile, the porosity, pore size and material of the gray matter and white matter regions were distinguished by an isolation layer, so as to induce the directed differentiation of cells into the defect site and promote regeneration of spinal cord tissue.
基金supported by National Natural Science Foundation of China(81101369,81071450)the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of China(to Shi Qin),Ph.D.Programs Foundation of State Education Ministry(20113201110013)+1 种基金Jiangsu Provincial Special Program of Medical Science(BL2012004,BK2011264)Jiangsu Province’s Key Provincial Talents Program(RC2011102)
文摘Nerve conduit is one of strategies for spine cord injury(SCI)treatment.Recently,studies showed that biomaterials could guide the neurite growth and promote axon regeneration at the injury site.However,the scaffold by itself was difficult to meet the need of SCI functional recovery.The basic fibroblast growth factor(bFGF)administration significantly promotes functional recovery after organ injuries.Here,using a rat model of T9 hemisected SCI,we aimed at assessing the repair capacity of implantation of collagen scaffold(CS)modified by collagen binding bFGF(CBD-bFGF).The results showed that CS combined with CBD-bFGF treatment improved survival rates after the lateral hemisection SCI.The CS/CBD-bFGF group showed more significant improvements in motor than the simply CS-implanted and untreated control group,when evaluated by the 21-point Basso-Beattie-Bresnahan(BBB)score and footprint analysis.Both hematoxylin and eosin(H&E)and immunohistochemical staining of neurofilament(NF)and glial fibrillary acidic protein(GFAP)demonstrated that fibers were guided to grow through the implants.These findings indicated that administration of CS modified with CBD-bFGF could promote spinal cord regeneration and functional recovery.
文摘目的:观察杜仲腰痛丸对大鼠脊髓损伤后炎症反应及神经元细胞形态变化的影响,探讨杜仲腰痛丸对脊髓损伤的保护作用及可能机制。方法:将50只成年SD大鼠随机分为A组、B组、C组,其中C组(药物干预)根据给药剂量不同依次分为C1组、C2组、C3组,共5组,每组各10只。A组行椎板切除术(不损伤脊髓),B组和C组均建立脊髓钳夹压迫损伤模型。造模成功后,A组和B组给予0.9%氯化钠溶液灌胃,C组给予不同剂量杜仲腰痛丸药液灌胃。分别于术后第1天、第3天、第5天、第7天进行BBB(Basso,Beattie and Bresnahan)肢体运动功能评分;于术后第7天取材后采用尼氏染色以观察脊髓组织病理变化,酶联免疫吸附试验(Enzyme-linked Immunosorbent Method,ELISA)法以检测肿瘤坏死因子-β和白细胞介素-1表达。结果:BBB肢体运动功能评分比较,术后第3天起C组显著优于同期B组及A组,差异具有统计学意义(P<0.05)。尼氏染色观察比较,C组根据给药剂量由低到高瘀血面积依次减小,神经细胞水肿程度依次减轻。ELISA检测分析,与A组及B组相比较,C组血清中肿瘤坏死因子-β和白细胞介素-1含量明显减低,差异具有统计学意义(P<0.05)。结论:杜仲腰痛丸能够有效抑制脊髓损伤后炎症反应,对神经元细胞具有保护作用,促进损伤神经细胞的修复。
