目的 探讨蜘蛛香环烯醚萜类成分对急性脊髓损伤大鼠神经细胞焦亡的影响,及其发挥神经保护作用的相关机制.方法 健康雄性Sprague-Dawley大鼠24只,随机分为假手术组、模型组和治疗组,每组8只.后两组建立大鼠急性脊髓损伤模型,假手术组只摘除椎板.术后4 h,治疗组灌胃蜘蛛香环烯醚萜类成分溶液10 mg/kg,模型组和假手术组灌胃等体积羧甲基纤维素钠(CMC-Na)溶液,每天1次,连续7 d.7 d后处死大鼠,HE染色观察脊髓组织病理情况,计算剩余组织残存面积,TUNEL法检测细胞死亡情况,ELISA检测血清中白细胞介素(IL)-1β和IL-18含量,Western blotting测定焦亡蛋白NLRP3、Caspase-1、GSDMD的表达水平.结果 与假手术组相比,模型组脊髓组织残存面积减少(P<0.05);TUNEL染色阳性率,IL-1β、IL-18含量以及焦亡蛋白NLRP3、Caspase-1、GSDMD的相对含量增加(P<0.05);与模型组比较,治疗组脊髓组织病理情况有所改善,组织残存面积增加(P<0.05),TUNEL染色阳性率,IL-1β、IL-18含量以及焦亡蛋白NLRP3、Caspase-1、GSDMD的相对含量降低(P<0.05).结论 蜘蛛香环烯醚萜类成分能减轻大鼠脊髓损伤后的炎症反应,发挥神经保护作用,其机制可能与调控NLRP3/Caspase-1通路抑制急性脊髓损伤大鼠的神经细胞焦亡有关.

TiO2 nanotubes arrays with dominant (001) facets were fabricated by multi-anodic oxidation technology. The influence factor of the electrolyte composition on the ratio of different facets for anatase TiO2 and the bioactivity were investigated. Besides, the characterization of the surface morphologies and crystal structures were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD),etc. Finally, the bioactivity was estimated by the CaP salt deposition vis biomineralization process and protein adsorption experiment. The results show that the relative proportions of different facets in the TiO2 nanotubes can be adjusted by changing the content of H2O in the electrolyte. The (004) facet texture coefficient of TiO2 nanotubes arrays prepared in 2%H2O (volume fraction) electrolyte reaches up to 4.76. The TiO2 nanotubes with dominant (001) facets can accelerate the deposition of hydroxyapatite and raise the amount of protein adsorption in the humanoid environment by providing more active sites for biomineralization and protein adsorption. The TiO2 nanotubes with a higher proportion of (001) facets have the more excellent biological activity.