TNF-α抗体对Sp1和NF-κ B p65在兔粘连腹膜表达的影响

目的探讨TNF-α抗体对实验兔腹膜损伤粘连修复演变过程中核转录因子Sp1和NF-κB p65活化的影响。方法实验兔随机分3组:正常对照组(不做任何处理)、模型组(腹膜腔内注入生理盐水)、TNF-α抗体组(造模后后腹膜腔内注入TNF-α抗体),每组30只,共90只。建立实验兔腹膜回盲部手术动物模型,ELISA检测腹水Sp1、NF-κB p65的表达,Masson染色检测Sp1在腹膜的表达、免疫组化SP法检测NF-κB p65在腹膜的表达,监测腹膜粘连分级变化。结果 TNF-α抗体导致Sp1和NF-κB p65在损伤腹膜和腹水中的表达水平显著减低(0.01),并有效减轻腹膜粘连形成。结论 TNF-α抗体有效减轻腹膜粘连形成可能与其下调Sp1和NF-κB p65表达相关。     

自体骨髓间充质干细胞治疗早期脊髓损伤疗效观察

目的 自体骨髓间充质干细胞移植治疗早期脊髓损伤的近期疗效和安全性.方法 2008年1月至2011年1月本院收治早期脊髓损伤患者64例,其中干细胞移植组35例患者通过蛛网膜下隙注射方式行白体骨髓间充质干细胞移植,同期入院但未行干细胞移植患者29例作为对照组.分别于移植前,移植后1、3、6个月采用美国脊髓损伤协会（ASIA）制定的评分标准对两组患者运动、感觉功能进行评定.同期随访血常规、凝血机制、生化全项、肿瘤标记物.结果 移植后1个月,两组患者运动、感觉功能都有不同程度恢复,且感觉功能恢复更为明显,各组间比较差异均无统计学意义（P＞0.05）.移植后3个月,各组患者运动功能评分均有所提高,各组间比较差异均无统计学意义（P＞0.05）.移植组患者感觉功能评分[（131.9±41.6）分]显著提高,与对照组[（108.3±36.4）分]比较差异有统计学意义（P＜0.05）.移植后6个月,对照组患者运动、感觉功能评分均未出现明显提高;蛛网膜下隙移植组患者仍有明显恢复,与对照组比较差异有统计学意义（P＜0.05）.随访各项检查结果均未出现明显异常.结论 蛛网膜下隙注射途径进行自体骨髓间充质干细胞移植治疗早期脊髓损伤安全,近期疗效确切,但远期疗效及安全性尚待进一步观察.     

Synthesis and Photovoltaic Properties of a D–A Copolymer Based on the 2,3‐Di(5‐hexylthio­phen‐2‐yl)quinoxaline Acceptor Unit

A new D–A copolymer ( PBDT‐DTQx) based on the 2,3‐di(5‐hexylthiophen‐2‐yl)quinoxaline acceptor unit and a bithienyl‐substituted benzodithiophene (BDT) donor unit is designed and synthesized for application as the donor material in polymer solar cells (PSCs). The polymer film shows a broad absorption band covering the wavelength range from 300 to 720 nm and a low highest occupied molecular orbital (HOMO) energy level at ?5.35 eV. A device based on PBDT‐DTQx :PC₇₀BM ([6,6]‐phenyl‐C71‐butyric acid methyl ester) (1:2.5, w/w) with chloronaphthalene as a solvent additive displays a power conversion efficiency (PCE) of 3.15%. With methanol treatment, the PCE of the PSCs is further improved to 3.90% with a significant increase of the short‐circuit current density, J_sc, from 10.10 mA cm^?2 for the device without the methanol treatment to 11.71 mA cm^?2 for the device with the methanol treatment.

     

Tandem Action of SNS–Cr and CGC–Ti in Preparation of Ethylene–1‐Hexene Copolymers from Ethylene Feedstock

Ethylene–1‐hexene copolymer materials, ranging from semicrystalline linear low‐density poly­ethylene (LLDPE) to completely amorphous polyethylenes (PEs), are prepared from ethylene alone in a single reactor by the tandem polymerization of bis(2‐dodecylsulfanyl‐ethyl)amine–CrCl₃ (SNS–Cr) and (N‐tert‐butylamido) (tetramethylcyclopentadienyl)–titanium dichloride (CGC–Ti) at 75 °C and under atmospheric pressure. The polymerization activities are on the order of 10⁵–10⁶ g (mol Ti)^?1 h^?1. 1‐Hexene incorporation in the resulting copolymers can be adjusted by varying the Cr–Ti molar ratio and/or applying a short period of pre‐trimerization. Copolymers with high 1‐hexene incorporation up to 15 mol% are obtained. Few vinyl and vinylene chain ends are detected by ¹³C NMR, suggesting that 1‐hexene does not act as a chain‐transfer agent. Narrow molecular‐weight distributions with polydispersities from 1.9 to 2.6 are obtained, characteristic of a single‐active‐site nature of the catalyst system.

     

Alteration of fecal tryptophan metabolism correlates with shifted microbiota and may be involved in pathogenesis of colorectal cancer

BACKGROUNDGut tryptophan (Trp) metabolites are produced by microbiota and/or host metabolism. Some of them have been proven to promote or inhibit colorectal cancer (CRC) in vitro and animal models. We hypothesized that there is an alteration of gut Trp metabolism mediated by microbiota and that it might be involved in the pathogenesis of cancer in patients with CRC.AIMTo investigate the features of Trp metabolism in CRC and the correlation between fecal Trp metabolites and gut microbiota.METHODSSeventy-nine patients with colorectal neoplastic lesions (33 with colon adenoma and 46 with sporadic CRC) and 38 healthy controls (HCs) meeting the inclusion and exclusion criteria were included in the study. Their demographic and clinical features were collected. Fecal Trp, kynurenine (KYN), and indoles (metabolites of Trp metabolized by gut microbiota) were examined by ultraperformance liquid chromatography coupled to tandem mass spectrometry. Gut barrier marker and indoleamine 2,3-dioxygenase 1 (IDO1) mRNA were analyzed by quantitative real-time polymerase chain reaction. Zonula occludens-1 (ZO-1) protein expression was analyzed by immunohistochemistry. The gut microbiota was detected by 16S ribosomal RNA gene sequencing. Correlations between fecal metabolites and other parameters were examined in all patients.RESULTSThe absolute concentration of KYN [1.51 (0.70, 3.46) nmol/g vs 0.81 (0.64, 1.57) nmol/g, P = 0.036] and the ratio of KYN to Trp [7.39 (4.12, 11.72) × 10^-3 vs 5.23 (1.86, 7.99) × 10^-3, P = 0.032] were increased in the feces of patients with CRC compared to HCs, while the indoles to Trp ratio was decreased [1.34 (0.70, 2.63) vs 2.46 (1.25, 4.10), P = 0.029]. The relative ZO-1 mRNA levels in patients with CRC (0.27 ± 0.24) were significantly lower than those in HCs (1.00 ± 0.31) (P < 0.001), and the relative IDO1 mRNA levels in patients with CRC [1.65 (0.47-2.46)] were increased (P = 0.035). IDO1 mRNA levels were positively associated with the KYN/Trp ratio (r = 0.327, P = 0.003). ZO-1 mRNA and protein levels were positively correlated with the indoles/Trp ratio (P = 0.035 and P = 0.009, respectively). In addition, the genera Asaccharobacter (Actinobacteria) and Parabacteroides (Bacteroidetes), and members of the phylum Firmicutes (Clostridium XlVb, Fusicatenibacter, Anaerofilum, and Anaerostipes) decreased in CRC and exhibited a positive correlation with indoles in all subjects.CONCLUSIONAlteration of fecal Trp metabolism mediated by microbiota is associated with intestinal barrier function and tissue Trp metabolism, and may be involved in the pathogenesis of CRC.     

CD137-CD137配体对巨噬细胞基质金属蛋白酶9及血管平滑肌细胞钙化形成的影响

目的探讨CD137-CD137配体(CD137L)信号是否通过调控巨噬细胞基质金属蛋白酶9(MMP-9)的表达影响血管平滑肌细胞(VSMC)钙化形成。方法采用巯基乙酸盐腹腔灌洗法获取C57BL/6J小鼠腹腔巨噬细胞(PM),采用组织块贴壁法取3~6代胸主动脉VSMC分为对照组、共培养组、CD137激动组和MMP-9抑制组(n=3)。对照组用重组CD137L蛋白干预VSMC,共培养组用PM和VSMC共培养,CD137激动组和MMP-9抑制组分别用重组CD137L蛋白和MMP-9抑制剂干预PM后,与VSMC共培养,再加入重组CD137蛋白(10μg/ml)干预。采用Western blot检测各组钙化相关的骨桥蛋白(OPN)、Runt相关转录因子2(Runx-2)表达,微板法检测钙离子浓度和碱性磷酸酶(ALP)活性,Von Kossa和茜素红染色检测各组细胞钙化程度。结果CD137激动组VSMC中OPN和Runx-2蛋白表达、钙离子浓度及ALP活性明显高于共培养组(P<0.01),而MMP-9抑制组VSMC中OPN和Runx-2蛋白表达、钙离子浓度及ALP活性明显低于CD137激动组,差异有统计学意义[0.25±0.27 vs 2.12±0.34,0.30±0.32 vs 2.63±0.41,(1.92±0.09)mmol/g vs(4.99±0.37)mmol/g,(1.11±0.50)KU/g vs(2.63±0.04)KU/g,P<0.01]。共培养组VSMC中OPN和Runx-2蛋白表达、钙离子浓度及ALP活性与对照组比较,无统计学意义(P>0.05)。CD137激动组茜素红染色红色颗粒物质沉积和Von Kossa染色黑色颗粒物质沉积明显多于对照组和共培养组;MMP-9抑制组钙化程度显著降低;对照组和共培养组钙化程度则无明显差异。结论CD137-CD137L信号可能通过调控巨噬细胞MMP-9表达影响VSMC钙化形成。     

P2X7受体在非小细胞肺癌中的表达及其临床意义*

的?探讨非小细胞肺癌（NSCLC）患者癌组织中P2X7R的表达及其临床意义。方法?回顾性分析2012年1月—2014年1月华中科技大学同济医学院附属武汉中心医院收治的NSCLC患者118例癌组织标本。采用免疫组织化学法检测NSCLC组织标本中P2X7R的表达,根据免疫组织化学结果将患者分为P2X7R高、低表达组。采用Kaplan-Meier曲线和Log-rank χ2检验比较P2X7R高、低表达组无瘤生存率和总生存率的差异;采用Cox比例风险模型分析影响NSCLC患者无瘤生存率和总生存率的独立危险因素。 结果?72例（61.0%）患者癌组织中P2X7R高表达。不同TNM分期和有无淋巴结转移患者的P2X7R蛋白高表达率比较,差异有统计学意义（P?<0.05）。P2X7R高表达组5年无瘤生存率低于P2X7R低表达组（18.1% VS 25.1%）（P?<0.05）;P2X7R高表达组5年总生存率低于P2X7R低表达组（23.3% VS 30.1%）（P?<0.05）。单因素Cox比例风险模型分析显示,P2X7R表达、TNM分期及淋巴结转移是影响NSCLC患者无瘤生存率的危险因素（P?<0.05）。多因素Cox比例风险模型分析表明,P2X7R表达[OlR=2.082（95% CI：1.079,3.747）,P?=0.001]及TNM分期[OlR=3.210（95% CI：0.587,6.448）,P?=0.028]是影响NSCLC患者无瘤生存率的危险因素。单因素Cox比例风险模型回归分析显示,P2X7R表达、TNM分期和淋巴结转移是影响NSCLC患者总生存率的危险因素（P?<0.05）。多因素Cox比例风险模型回归分析表明,P2X7R表达[OlR=2.893（95%CI：1.582,4.562）,P?=0.002]及TNM分期[OlR=1.910（95%CI：0.587,2.449）,P?=0.038]是影响NSCLC患者总生存率的危险因素。结论?P2X7R表达可作为影响NSCLC预后的新分子标志物。     

基于模拟炮制法研究黄芩炒炭前后苷类成分的变化

目的:通过模拟炮制法探讨不同炒炭程度对黄芩饮片中苷类成分变化的影响。方法:采用Diamonsil C18(250 mm×4.6 mm,5μm)色谱柱;柱温箱温度25℃;进样量10μL;检测波长277 nm;流动相A为甲醇,B为0.4%磷酸,C为乙腈,使用梯度洗脱的方式,流速1 mL/min。通过模拟炮制的方法对黄芩苷与黄芩素、汉黄芩苷与汉黄芩素在炒炭温度下的转化进行初步研究。结果:黄芩炒炭后,黄芩苷以及汉黄芩苷的含量下降,而黄芩素以及汉黄芩素的含量均呈现先上升后下降的趋势。另外,在黄芩苷模拟样品中检出黄芩素,在汉黄芩苷模拟炮制品种检出汉黄芩素。结论:不同炒炭程度对黄芩中黄芩苷、汉黄芩苷、黄芩素、汉黄芩素含量有显著影响,模拟炮制法可较为真实地反映黄芩苷类成分在炒炭过程中的变化情况。     

miR-93-3p对高糖诱导的肾小管上皮细胞损伤及炎症因子分泌的影响

目的 微小miRNA-93-3p（miR-93-3p）对高糖诱导的肾小管上皮细胞损伤及炎症因子分泌的影响。方法 体外培养肾小管上皮细胞,分为NC组、HG组、anti miR NC组、anti miR-93-3p组、HG+ miR NC组、HG+miR-93-3p组。采用实时荧光定量聚合酶链反应（qRT-PCR）检测miR 93 3p的表达;酶联免疫吸附（ELISA）法检测肿瘤坏死因子 α（TNF-α）、白细胞介素6（IL-6）水平;甲基噻唑基四唑（MTT）检测细胞增殖能力;流式细胞术检测细胞凋亡率;蛋白免疫印迹法（Western blot）检测细胞周期蛋白1（CyclinD1）、活化的含半胱氨酸的天冬氨酸蛋白水解酶3（C caspase-3）、磷酸化 磷脂酰肌醇激酶（p-PI3K）、磷酸化 蛋白激酶 B（p-AKT）表达量。结果 与NC组相比,HG组miR 93 3p的表达水平显著降低（P＜0.05）,细胞存活率显著降低（P＜0.05）,CyclinD1蛋白表达水平显著降低（P＜0.05）,而细胞凋亡率显著升高（P＜0.05）,C caspase 3、p PI3K、p AKT蛋白表达水平显著升高（P＜0.05）,TNF α、IL 6水平显著升高（P＜0.05）;与anti miR NC组相比,anti miR-93-3p组细胞存活率显著降低（P＜0.05）,细胞凋亡率显著升高（P＜0.05）,C caspase 3蛋白表达水平显著升高（P＜0.05）,TNF α、IL 6水平显著升高（P＜0.05）;与HG+ miR NC组相比,HG+miR 93 3p组细胞存活率显著升高（P＜0.05）,细胞凋亡率显著降低（P＜0.05）,CyclinD1蛋白表达水平显著升高（P＜0.05）,C caspase 3、p PI3K、p AKT蛋白表达水平显著降低（P＜0.05）,TNF α、IL 6水平显著降低（P＜0.05）。结论 miR 93 3p通过调控PI3K/AKT信号通路抑制高糖诱导的肾小管上皮细胞损伤及炎症因子分泌。