The transplantation of polylactic glycolic acid conduits combining bone marrow mesenchymal stem cells and extracellular matrix gel for the repair of sciatic nerve injury is effective in some respects, but few data com...The transplantation of polylactic glycolic acid conduits combining bone marrow mesenchymal stem cells and extracellular matrix gel for the repair of sciatic nerve injury is effective in some respects, but few data comparing the biomechanical factors related to the sciatic nerve are available. In the present study, rabbit models of 10-mm sciatic nerve defects were prepared. The rabbit models were repaired with autologous nerve, a polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells, or a polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells ＋ extracellular matrix gel. After 24 weeks, mechanical testing was performed to determine the stress relaxation and creep parameters. Following sciatic nerve injury, the magnitudes of the stress decrease and strain increase at 7,200 seconds were largest in the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells ＋ extracellular matrix gel group, followed by the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells group, and then the autologous nerve group. Hematoxylin-eosin staining demonstrated that compared with the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells group and the autologous nerve group, a more complete sciatic nerve regeneration was found, including good myelination, regularly arranged nerve fibers, and a completely degraded and resorbed conduit, in the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells ＋ extracellular matrix gel group. These results indicate that bridging 10-mm conduit ＋ bone marrow mesenchymal stem sciatic nerve defects with a polylactic glycolic acid cells ＋ extracellular matrix gel construct increases the stress relaxation under a constant strain, reducing anastomotic tension. Large elongations under a constant physiological load can limit the anastomotic opening and shift, which is beneficial for the regeneration and functional reconstruction of sciatic nerve. Better regeneration was found with the polylactic gly展开更多
[目的]动态观察大鼠颈部动、静力失去平衡后颈椎间盘组织形态学及超微结构的改变。[方法]SD大鼠60只,随机分为3、5、7个月模型组和对照假手术组,每组10只,通过破坏大鼠颈部肌肉、韧带诱导颈椎间盘退变,按月取材。各组椎间盘HE、Tolu id ...[目的]动态观察大鼠颈部动、静力失去平衡后颈椎间盘组织形态学及超微结构的改变。[方法]SD大鼠60只,随机分为3、5、7个月模型组和对照假手术组,每组10只,通过破坏大鼠颈部肌肉、韧带诱导颈椎间盘退变,按月取材。各组椎间盘HE、Tolu id ine b lue染色,在光镜下观察用体视学分析软件、D issector自动计数法分析软骨终板内血管芽的数量、面积和软骨终板的厚度,M iyamoto分级法综合评判颈椎间盘退变的程度;透射电镜观察椎间盘细胞凋亡的超微结构。[结果]与对照假手术组比较,3个月造模组动物颈椎间盘已开始退行性变化,纤维环板层结构紊乱,关节软骨钙化层增厚,软骨下血管明显减少;5个月模型组髓核完全纤维化,纤维环板层状结构消失,血管芽稀少,血管壁充血曲张;7个月模型组椎间盘内部结构与5个月模型组相似,部分椎体边缘骨赘形成。在电镜下,3个月造模组椎间盘细胞,细胞表面突起减少,细胞器稀少,胞质内有脂滴,可见到凋亡细胞形成的凋亡小体。5个月和7个月模型组椎间盘组织中细胞较少,基质中胶原纤维断裂,可见到许多坏死空化的细胞。[结论]模型组大鼠颈椎间盘都出现典型的退变形态学变化,随着造模月份的延长退变程度越严重;早期和中期退变椎间盘中可观察到凋亡细胞,在退变的晚期可观察到坏死细胞。展开更多
目的研究痛风速效灵对急性痛风性关节炎模型大鼠不同时相步态和关节组织形态学的影响,探讨其治疗急性痛风性关节炎的作用机制。方法将96只雄性SD大鼠随机分为3组:模型对照(A)组、秋水仙碱(B)组和痛风速效灵(C)组,用氧嗪酸钾和尿酸钠分...目的研究痛风速效灵对急性痛风性关节炎模型大鼠不同时相步态和关节组织形态学的影响,探讨其治疗急性痛风性关节炎的作用机制。方法将96只雄性SD大鼠随机分为3组:模型对照(A)组、秋水仙碱(B)组和痛风速效灵(C)组,用氧嗪酸钾和尿酸钠分别行腹腔和右踝关节腔内注射制造高尿酸血症并急性痛风性关节炎模型,各组于造模前3 h和造模后3 h分别予生理盐水、秋水仙碱和中药痛风速效灵进行灌胃干预,并于造模后6,12,24和36 h 4个时相各取8只,行步态观察、取关节组织,比较3组在步态和关节组织学方面的变化。结果痛风速效灵可改善致炎大鼠的步态(与B组比较P>0.05,与A组比较P<0.05);痛风速效灵可抑制致炎大鼠的关节液中WBC渗出、可抑制和改善致炎大鼠的关节滑膜炎症反应程度(与B组比较P>0.05,与A组比较P<0.05)。结论痛风速效灵可抑制模型大鼠关节炎症发展和改善痛风病变关节病理形态。展开更多
基金supported by the Science and Technology Development Program of Jilin Province in China,No.20110492
文摘The transplantation of polylactic glycolic acid conduits combining bone marrow mesenchymal stem cells and extracellular matrix gel for the repair of sciatic nerve injury is effective in some respects, but few data comparing the biomechanical factors related to the sciatic nerve are available. In the present study, rabbit models of 10-mm sciatic nerve defects were prepared. The rabbit models were repaired with autologous nerve, a polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells, or a polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells ＋ extracellular matrix gel. After 24 weeks, mechanical testing was performed to determine the stress relaxation and creep parameters. Following sciatic nerve injury, the magnitudes of the stress decrease and strain increase at 7,200 seconds were largest in the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells ＋ extracellular matrix gel group, followed by the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells group, and then the autologous nerve group. Hematoxylin-eosin staining demonstrated that compared with the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells group and the autologous nerve group, a more complete sciatic nerve regeneration was found, including good myelination, regularly arranged nerve fibers, and a completely degraded and resorbed conduit, in the polylactic glycolic acid conduit ＋ bone marrow mesenchymal stem cells ＋ extracellular matrix gel group. These results indicate that bridging 10-mm conduit ＋ bone marrow mesenchymal stem sciatic nerve defects with a polylactic glycolic acid cells ＋ extracellular matrix gel construct increases the stress relaxation under a constant strain, reducing anastomotic tension. Large elongations under a constant physiological load can limit the anastomotic opening and shift, which is beneficial for the regeneration and functional reconstruction of sciatic nerve. Better regeneration was found with the polylactic gly
文摘[目的]动态观察大鼠颈部动、静力失去平衡后颈椎间盘组织形态学及超微结构的改变。[方法]SD大鼠60只,随机分为3、5、7个月模型组和对照假手术组,每组10只,通过破坏大鼠颈部肌肉、韧带诱导颈椎间盘退变,按月取材。各组椎间盘HE、Tolu id ine b lue染色,在光镜下观察用体视学分析软件、D issector自动计数法分析软骨终板内血管芽的数量、面积和软骨终板的厚度,M iyamoto分级法综合评判颈椎间盘退变的程度;透射电镜观察椎间盘细胞凋亡的超微结构。[结果]与对照假手术组比较,3个月造模组动物颈椎间盘已开始退行性变化,纤维环板层结构紊乱,关节软骨钙化层增厚,软骨下血管明显减少;5个月模型组髓核完全纤维化,纤维环板层状结构消失,血管芽稀少,血管壁充血曲张;7个月模型组椎间盘内部结构与5个月模型组相似,部分椎体边缘骨赘形成。在电镜下,3个月造模组椎间盘细胞,细胞表面突起减少,细胞器稀少,胞质内有脂滴,可见到凋亡细胞形成的凋亡小体。5个月和7个月模型组椎间盘组织中细胞较少,基质中胶原纤维断裂,可见到许多坏死空化的细胞。[结论]模型组大鼠颈椎间盘都出现典型的退变形态学变化,随着造模月份的延长退变程度越严重;早期和中期退变椎间盘中可观察到凋亡细胞,在退变的晚期可观察到坏死细胞。
文摘目的研究痛风速效灵对急性痛风性关节炎模型大鼠不同时相步态和关节组织形态学的影响,探讨其治疗急性痛风性关节炎的作用机制。方法将96只雄性SD大鼠随机分为3组:模型对照(A)组、秋水仙碱(B)组和痛风速效灵(C)组,用氧嗪酸钾和尿酸钠分别行腹腔和右踝关节腔内注射制造高尿酸血症并急性痛风性关节炎模型,各组于造模前3 h和造模后3 h分别予生理盐水、秋水仙碱和中药痛风速效灵进行灌胃干预,并于造模后6,12,24和36 h 4个时相各取8只,行步态观察、取关节组织,比较3组在步态和关节组织学方面的变化。结果痛风速效灵可改善致炎大鼠的步态(与B组比较P>0.05,与A组比较P<0.05);痛风速效灵可抑制致炎大鼠的关节液中WBC渗出、可抑制和改善致炎大鼠的关节滑膜炎症反应程度(与B组比较P>0.05,与A组比较P<0.05)。结论痛风速效灵可抑制模型大鼠关节炎症发展和改善痛风病变关节病理形态。
