The blood-spinal cord barrier plays a vital role in recovery after spinal cord injury.The neurovascular unit concept emphasizes the relationship between nerves and vessels in the brain,while the effect of the blood-sp...The blood-spinal cord barrier plays a vital role in recovery after spinal cord injury.The neurovascular unit concept emphasizes the relationship between nerves and vessels in the brain,while the effect of the blood-spinal cord barrier on the neurovascular unit is rarely reported in spinal cord injury studies.Mouse models of spinal cord injury were established by heavy object impact and then immediately injected with plateletderived growth factor(80μg/kg)at the injury site.Our results showed that after platelet-derived growth factor administration,spinal cord injury,neuronal apoptosis,and blood-spinal cord barrier permeability were reduced,excessive astrocyte proliferation and the autophagyrelated apoptosis signaling pathway were inhibited,collagen synthesis was increased,and mouse locomotor function was improved.In vitro,human umbilical vein endothelial cells were established by exposure to 200μM H2O2.At 2 hours prior to injury,in vitro cell models were treated with 5 ng/mL platelet-derived growth factor.Our results showed that expression of blood-spinal cord barrier-related proteins,including Occludin,Claudin 5,andβ-catenin,was significantly decreased and autophagy was significantly reduced.Additionally,the protective effects of platelet-derived growth factor could be reversed by intraperitoneal injection of 80 mg/kg chloroquine,an autophagy inhibitor,for 3 successive days prior to spinal cord injury.Our findings suggest that platelet-derived growth factor can promote endothelial cell repair by regulating autophagy,improve the function of the blood-spinal cord barrier,and promote the recovery of locomotor function post-spinal cord injury.Approval for animal experiments was obtained from the Animal Ethics Committee,Wenzhou Medical University,China(approval No.wydw2018-0043)in July 2018.展开更多
Objective:Underwater shock can produce extremely high accelerations, resulting in severe human injuries on shipboard, and human thoraco lumbar spines are prone to suffer from injuries by ship shock motion. To observe ...Objective:Underwater shock can produce extremely high accelerations, resulting in severe human injuries on shipboard, and human thoraco lumbar spines are prone to suffer from injuries by ship shock motion. To observe the viscoelasticity of thoracolumbar of young fresh cadavers, and to provide biomechanical parameters for both research and clinical practice. Materials and Methods:5 fresh young male cadavers (aged 22 to 31 years) were provided, and 15 thoracolumbar spinal anatomies of 5 samples were harvested within 1 hour of death. WE-10A universal testing machine was used for creep and relaxation tests.Results:Stress relaxation and creep deformation equations are derived from the biomechanics model and the measured and simulated curves are compared. The creep in vertebral bodies and intervertebral discs exhibited significantly changes in the first 5 min and 10 min, respectively. The stress rapidly decreased in the first 2 min, and then gradually went balance during the relaxation process. Conclusion:The change in creep rate is significant at early stage,and gradually slows down.This indicates that the differences between internal pressure and local pressure are decreased until balance. The simulated curve derived from equation coincides with the experimental data to a large degree, which states that the equation is rational and reliable.展开更多
目的:介绍新型组合式腰椎间融合器的设计原理和构型,并对其进行生物力学评价。方法:采用聚醚醚酮材料研制一种具有组合式构型的腰椎椎间融合器,在新鲜小牛脊柱功能节段标本上测试正常组(完整状态)、椎间盘摘除组(不稳组)、自体植骨融合...目的:介绍新型组合式腰椎间融合器的设计原理和构型,并对其进行生物力学评价。方法:采用聚醚醚酮材料研制一种具有组合式构型的腰椎椎间融合器,在新鲜小牛脊柱功能节段标本上测试正常组(完整状态)、椎间盘摘除组(不稳组)、自体植骨融合组、传统PEEK融合器组(与新型融合器材料大小形状相同)、新型PEEK融合器组合组(融合器在组合状态)、新型PEEK融合器分开组(融合器在分开状态)在前屈、后伸、左、右侧屈、左右旋转状态下的活动角度值(Range of Motion,ROM)和压缩载荷和拔出力(分别在装载植骨、未装载植骨时)。结果:(1)新型分开组与正常组、不稳组和植骨组在前屈、后伸、左右侧弯4种状态比较,P<0.05,有统计学差异;(2)与传统融合组、新型组合组相比,P>0.05,无统计学差异;(3)新型分开组左、右旋转状态与正常组和植骨组相比,P>0.05,无显著统计学意义,但与传统融合组、新型组合组相比,ROM数值增大,P<0.05,有统计学差异。(4)新型融合器分开组在未植骨和植骨时的压缩载荷值大于传统融合器组、新型融合器组合组,但无统计学差异;(5)新型融合器分开组拔出力在植骨和未植骨时均低于传统融合器组和新型融合器组合组,但无统计学差异。结论:新型组合式腰椎间融合器体外生物力学实验显示具有良好的植入运动稳定性和抗压缩载荷、抗拔出性能,能满足临床植入的生物力学要求,尤其是微创脊柱外科手术中。展开更多
目的观察单节段Discover人工颈椎间盘置换术及颈椎前路减压融合术后颈椎整体曲度和置换节段活动度的变化情况,分析其临床效果。方法回顾性分析2008年3月至2013年3月治疗的48例颈椎病及颈椎间盘突出症患者,其中18例行Discover人工颈椎间...目的观察单节段Discover人工颈椎间盘置换术及颈椎前路减压融合术后颈椎整体曲度和置换节段活动度的变化情况,分析其临床效果。方法回顾性分析2008年3月至2013年3月治疗的48例颈椎病及颈椎间盘突出症患者,其中18例行Discover人工颈椎间盘置换术（置换组）,男8例,女10例,年龄31-58岁,平均44.2岁;30例行颈椎前路减压融合术（融合组）,男13例,女17例,年龄35-68岁,平均49.8岁。测量手术前后和末次随访时置换节段活动度（range of motion,ROM）,置换节段脊柱功能单位（functional spinal unit,FSU）Cobb角和颈椎整体曲度（C2-7Cobb角）。结果两组患者均获得12个月以上随访,末次随访置换节段屈伸活动度置换组较术前稍增加,左右侧屈活动度无明显变化,而融合组屈伸及左右侧屈活动度较术前明显减小,差异有统计学意义（P〈0.05）;两组间末次随访相比较,融合组屈伸及左右侧屈活动度明显减小,差异有统计学意义（P〈0.05）。末次随访FSU置换组较术前明显增加,差异有统计学意义（P〈0.05）,而融合组无明显变化;两组间末次随访相比较,置换组明显增加,差异有统计学意义（P〈0.05）。末次随访颈椎曲度置换组较术前稍增加,而融合组较术前明显减小,差异有统计学意义（P〈0.05）;两组间末次随访相比较,融合组明显减小,差异有统计学意义（P〈0.05）。结论单节段Discover人工颈椎间盘置换术后对颈椎整体曲度及置换节段活动度的影响小,与传统前路减压融合术相比,可以较好发挥其对颈椎的保护作用。展开更多
基金This study was partly supported by research grants from the National Natural Science Foundation of China,Nos.81802251(to KX),81772450(to HYZ)and 81801233(to YQW)the Natural Science Foundation of Zhejiang Province of China,Nos.LQ18H150003(to KX),LY19H150001(to DQC),LQ18H090011(to YQW)and LQ20C200015(to HJ)the Opening Project of Zhejiang Provincial Top Key Discipline of Pharmaceutical Sciences,No.YKFJ3-011(to KX).
文摘The blood-spinal cord barrier plays a vital role in recovery after spinal cord injury.The neurovascular unit concept emphasizes the relationship between nerves and vessels in the brain,while the effect of the blood-spinal cord barrier on the neurovascular unit is rarely reported in spinal cord injury studies.Mouse models of spinal cord injury were established by heavy object impact and then immediately injected with plateletderived growth factor(80μg/kg)at the injury site.Our results showed that after platelet-derived growth factor administration,spinal cord injury,neuronal apoptosis,and blood-spinal cord barrier permeability were reduced,excessive astrocyte proliferation and the autophagyrelated apoptosis signaling pathway were inhibited,collagen synthesis was increased,and mouse locomotor function was improved.In vitro,human umbilical vein endothelial cells were established by exposure to 200μM H2O2.At 2 hours prior to injury,in vitro cell models were treated with 5 ng/mL platelet-derived growth factor.Our results showed that expression of blood-spinal cord barrier-related proteins,including Occludin,Claudin 5,andβ-catenin,was significantly decreased and autophagy was significantly reduced.Additionally,the protective effects of platelet-derived growth factor could be reversed by intraperitoneal injection of 80 mg/kg chloroquine,an autophagy inhibitor,for 3 successive days prior to spinal cord injury.Our findings suggest that platelet-derived growth factor can promote endothelial cell repair by regulating autophagy,improve the function of the blood-spinal cord barrier,and promote the recovery of locomotor function post-spinal cord injury.Approval for animal experiments was obtained from the Animal Ethics Committee,Wenzhou Medical University,China(approval No.wydw2018-0043)in July 2018.
文摘Objective:Underwater shock can produce extremely high accelerations, resulting in severe human injuries on shipboard, and human thoraco lumbar spines are prone to suffer from injuries by ship shock motion. To observe the viscoelasticity of thoracolumbar of young fresh cadavers, and to provide biomechanical parameters for both research and clinical practice. Materials and Methods:5 fresh young male cadavers (aged 22 to 31 years) were provided, and 15 thoracolumbar spinal anatomies of 5 samples were harvested within 1 hour of death. WE-10A universal testing machine was used for creep and relaxation tests.Results:Stress relaxation and creep deformation equations are derived from the biomechanics model and the measured and simulated curves are compared. The creep in vertebral bodies and intervertebral discs exhibited significantly changes in the first 5 min and 10 min, respectively. The stress rapidly decreased in the first 2 min, and then gradually went balance during the relaxation process. Conclusion:The change in creep rate is significant at early stage,and gradually slows down.This indicates that the differences between internal pressure and local pressure are decreased until balance. The simulated curve derived from equation coincides with the experimental data to a large degree, which states that the equation is rational and reliable.
文摘目的:介绍新型组合式腰椎间融合器的设计原理和构型,并对其进行生物力学评价。方法:采用聚醚醚酮材料研制一种具有组合式构型的腰椎椎间融合器,在新鲜小牛脊柱功能节段标本上测试正常组(完整状态)、椎间盘摘除组(不稳组)、自体植骨融合组、传统PEEK融合器组(与新型融合器材料大小形状相同)、新型PEEK融合器组合组(融合器在组合状态)、新型PEEK融合器分开组(融合器在分开状态)在前屈、后伸、左、右侧屈、左右旋转状态下的活动角度值(Range of Motion,ROM)和压缩载荷和拔出力(分别在装载植骨、未装载植骨时)。结果:(1)新型分开组与正常组、不稳组和植骨组在前屈、后伸、左右侧弯4种状态比较,P<0.05,有统计学差异;(2)与传统融合组、新型组合组相比,P>0.05,无统计学差异;(3)新型分开组左、右旋转状态与正常组和植骨组相比,P>0.05,无显著统计学意义,但与传统融合组、新型组合组相比,ROM数值增大,P<0.05,有统计学差异。(4)新型融合器分开组在未植骨和植骨时的压缩载荷值大于传统融合器组、新型融合器组合组,但无统计学差异;(5)新型融合器分开组拔出力在植骨和未植骨时均低于传统融合器组和新型融合器组合组,但无统计学差异。结论:新型组合式腰椎间融合器体外生物力学实验显示具有良好的植入运动稳定性和抗压缩载荷、抗拔出性能,能满足临床植入的生物力学要求,尤其是微创脊柱外科手术中。
文摘目的观察单节段Discover人工颈椎间盘置换术及颈椎前路减压融合术后颈椎整体曲度和置换节段活动度的变化情况,分析其临床效果。方法回顾性分析2008年3月至2013年3月治疗的48例颈椎病及颈椎间盘突出症患者,其中18例行Discover人工颈椎间盘置换术（置换组）,男8例,女10例,年龄31-58岁,平均44.2岁;30例行颈椎前路减压融合术（融合组）,男13例,女17例,年龄35-68岁,平均49.8岁。测量手术前后和末次随访时置换节段活动度（range of motion,ROM）,置换节段脊柱功能单位（functional spinal unit,FSU）Cobb角和颈椎整体曲度（C2-7Cobb角）。结果两组患者均获得12个月以上随访,末次随访置换节段屈伸活动度置换组较术前稍增加,左右侧屈活动度无明显变化,而融合组屈伸及左右侧屈活动度较术前明显减小,差异有统计学意义（P〈0.05）;两组间末次随访相比较,融合组屈伸及左右侧屈活动度明显减小,差异有统计学意义（P〈0.05）。末次随访FSU置换组较术前明显增加,差异有统计学意义（P〈0.05）,而融合组无明显变化;两组间末次随访相比较,置换组明显增加,差异有统计学意义（P〈0.05）。末次随访颈椎曲度置换组较术前稍增加,而融合组较术前明显减小,差异有统计学意义（P〈0.05）;两组间末次随访相比较,融合组明显减小,差异有统计学意义（P〈0.05）。结论单节段Discover人工颈椎间盘置换术后对颈椎整体曲度及置换节段活动度的影响小,与传统前路减压融合术相比,可以较好发挥其对颈椎的保护作用。
