Impact of an autologous oxygenating matrix culture system on rat islet transplantation outcome

Disruption of the pancreatic islet environment combined with the decrease in oxygen supply that occurs during isolation leads to poor islet survival. The aim of this study was to validate the benefit of using a plasma-based scaffold supplemented with perfluorodecalin to improve islet transplantation outcome.Rat islets were cultured in three conditions: i) control group, ii) plasma based-matrix (P-matrix), and iii) P-matrix supplemented with emulsified perfluorodecalin. After 24 h culture, matrix/cell contacts (Integrinβ1, p-FAK/FAK, p-Akt/Akt), survival (caspase 3, TUNEL, FDA/PI), function, and HIF-1α translocation were assessed. Afterwards, P-matrices were dissolved and the islets were intraportally transplanted. Graft function was monitored for 31 days with glycaemia and C-peptide follow up. Inflammation was assessed by histology (macrophage and granulocyte staining) and thrombin/anti-thrombin complex measurement.Islet survival correlated with an increase in integrin, FAK, and Akt activation in P-matrices and function was maintained. Perfluorodecalin supplementation decreased translocation of HIF-1α in the nucleus and post-transplantation islet structure was better preserved in P-matrices, but a quicker activation of IBMIR resulted in early loss of graft function.“Oxygenating” P-matrices provided a real benefit to islet survival and resistance in vivo. However, intraportal transplantation is not suitable for this kind of culture due to IBMIR; thus, alternative sites must be explored.     

透骨消痛颗粒对关节软骨细胞wnt/β-连环蛋白信号通路的调控

背景:由巴戟天、杭白芍、肿节风和川芎等组成的透骨消痛颗粒能有效延缓关节宏观形态、软骨基质及软骨细胞退变.目的:观察透骨消痛颗粒对软骨细胞wnt/β-连环蛋白信号通路中Wnt4、糖原合成酶3.及.-连环蛋白的影响.方法:将SD 大鼠关节软骨细胞分离培养成功后,人白细胞介素 1β诱导软骨细胞退变,取第2 代退变软骨细胞,随机分为对照组和透骨消痛颗粒组,后者加入透骨消痛颗粒醇提物,分别培养4,8 d 后,采用RT-PCR 检测2 组Wnt4、糖原合成酶3β、β-连环蛋白mRNA 表达,采用蛋白印迹法检测Wnt4、糖原合成酶3β及β-连环蛋白表达.结果与结论:采用人白细胞介素1β可诱导软骨细胞退变,软骨细胞退变早期均有Wnt4、糖原合成酶3β及β-连环蛋白表达,但随着时间推移Wnt4、β-连环蛋白表达下降,而糖原合成酶3β表达增高,采用透骨消痛颗粒醇提物干预后均可逆转上述现象.说明透骨消痛颗粒醇提物能诱导软骨细胞转录合成.-连环蛋白和Wnt4 蛋白,并抑制糖原合成酶3β表达.     

MIF在青年高血压患者血清中的含量及临床意义

目的：探讨青年原发性高血压患者血清巨噬细胞移动抑制因子（MIF）水平的变化及其对高血压危险分层的临床意义。方法：选取206例青年原发性高血压患者为观察组,另取同期健康体检者206名健康成人作为对照组,以酶联免疫吸附法（ELISA）检测MIF水平,将高血压危险分层分为Ⅰ～Ⅲ级,比较各级别原发性高血压患者MIF水平。结果：观察组与对照组受检者血清MIF水平分别为6.202（4.034～9.135）、4.328（3.672-8.931）ng/ml。Ⅰ、Ⅱ、Ⅲ级高血压患者血清MIF分别为4.88、5.23、8.37ng/ml。观察组与对照组MIF水平比较,差异均有统计学意义（P〈0.05）。高血压Ⅰ～Ⅲ级患者血清MIF水平比较,差异均有统计学意义（P〈0.05）。结论：青年原发性高血压患者发病因素与体重指数相关,青年原发性高血压MIF水平高于正常对照人群,原发性高血压患者危险级别高者MIF水平较高。     

甘草酸二铵注射液与中性胰岛素注射液的配伍稳定性考察

目的:考察室温下甘草酸二铵注射液与中性胰岛素注射液在5%葡萄糖注射液、10%葡萄糖注射液中的配伍稳定性。方法:采用高效液相色谱法测定25℃下,甘草酸二铵注射液与中性胰岛素注射液分别在5%、10%葡萄糖注射液中24h内的含量变化,同时考察2组混合液的pH值和外观变化。结果:甘草酸二铵注射液与中性胰岛素注射液在2种溶媒中配伍后,24h内二者含量无明显变化,混合液pH值和外观亦无明显变化,性质稳定。结论:甘草酸二铵注射液与中性胰岛素注射液在5%、10%葡萄糖注射液中可配伍应用。     

外源性血管内皮生长因子对损伤脊髓的作用

目的 研究外源性血管内皮生长因子(VEGF)局部应用对大鼠损伤脊髓神经组织的作用.方法采用改良Allen氏重量打击法大鼠急性脊髓损伤模型.脊髓打击性损伤后,将模型大鼠随机分组,并依组别在蛛网膜下腔分别给药.A组:生理盐水10μL,B组:Matrigel蛋白胶10 μL,C组:重组人VEGF165 0.2 μg+Matr...