弓形虫GRA6可溶性蛋白在大肠埃希菌中的表达及纯化

目的在大肠埃希菌中高效表达及纯化弓形虫GRA6抗原,为制作弓形虫感染基因工程诊断试剂盒奠定基础.方法将重组pGEX-GRA6表达载体转化大肠埃希菌BL21-Codon Plus（DE3）-RP菌株,在异丙基硫代-β-D半乳糖苷（IPTG）诱导下表达.超声破壁后,通过十二烷基硫酸钠-聚丙烯酰胺凝胶电泳（SDS-PAGE）分析表达产物的表达形式,并对表达产物以硫酸铵沉淀、Sephedax G50脱盐和GST亲和层析柱进行目的蛋白的纯化.通过Western blotting检测其纯化的重组抗原的免疫反应性.结果GRA6以融合蛋白（GST-GRA6）的形式在大肠埃希菌中得到了高效表达.对表达产物可溶性分析表明,表达蛋白在上清液中和包涵体中均有表达.在上清液中表达的可溶性蛋白经纯化后蛋白纯度可达90%以上.Western blotting分析表明纯化蛋白能被弓形虫感染的人血清所识别.结论GRA6在大肠埃希菌中得到了高效表达,重组抗原经纯化后能特异性地被弓形虫感染者血清所识别.     

清热理气冲剂对实验性胆汁反流性胃炎大鼠血浆内皮素和降钙素基因相关肽的影响

目的 探讨清热理气冲剂对实验性胆汁反流性胃炎（BRG）大鼠血浆内皮素（ET）和降钙素基因相关肽（CGRP）的影响。方法 60只大鼠随机分为A组（中药等效剂量组），B组（中药大剂量组），C组（西沙必利等效剂量组），D组（枸橼酸铋钾等效剂量组），E组（病理对照组）和F组（正常对照组）。除F组外，其余各组大鼠应用胆汁灌胃导致胃黏膜损害。2W后分别应用清热理气冲剂等效剂量、大剂量、西沙必利、枸橼酸铋钾处理。实验第4周观察胆汁反流性胃炎胃黏膜病理形态和应用放免法测定血浆ET和CGRP含量。结果 F组可见黏膜下层充血水肿，胃小凹增生，肠上皮化生，炎性细胞浸润等，而A组和B组胃黏膜组织形态显著改善。F组电镜观察到胃黏膜细胞问的紧密连接受损，线粒体肿胀，粗面内质网扩张，微绒毛变短或丢失，A组和B组的超微结构明显的改善。A组和B组血浆ET明显低于E组（P〈0．01）。A组和B组血浆CGRP明显高于E组（P〈0．01）。结论 清热理气冲剂可以减轻胃黏膜损伤，通过影响血浆ET和CGRP相关肽含量而达到治疗BRG目的。     

金银花与忍冬叶挥发油成分对小鼠淋巴细胞增殖效果研究

目的 提取、分析金银花、忍冬叶挥发油成分;比较两者对小鼠淋巴细胞增殖效果。方法 采用多级蒸馏设备提取挥发油,通过气相色谱-质谱(GC-MS)法进行成分解析及定量;采用小鼠灌胃,进行淋巴细胞转化实验测定。结果 与传统方法相比,自制多级蒸馏设备挥发油提取率明显提高;金银花和忍冬叶挥发油在种类及含量上存在一定异同;药理结果显示,忍冬叶和金银花挥发油均能显著促进小鼠淋巴细胞转化,且忍冬叶挥发油增强免疫药理活性更为明显。结论 相比金银花,忍冬叶挥发油成分种类及含量丰富,增强免疫药理活性明显,可为新药源及保健功能开发提供研究基础。     

裸花紫珠颗粒联合替硝唑、头孢呋辛钠治疗慢性盆腔炎患者的疗效评价

目的分析裸花紫珠颗粒联合替硝唑氯化钠注射液、头孢呋辛钠抗菌药物治疗慢性盆腔炎(CPID)患者的临床效果。方法选取2017年1月~2018年12月某院CPID患者126例,随机分为研究组(n=63)与对照组(n=63),对照组予以替硝唑氯化钠注射液、头孢呋辛钠治疗,研究组在对照组基础上加用裸花紫珠颗粒。对比两组疗效、临床症状改善时间(发热、白带异常、下腹痛)及治疗前后血清炎性因子水平[白细胞介素-1β(IL-1β)、单核细胞趋化蛋白-1(MCP-1)]变化。结果研究组总有效率92.06%(58/63)较对照组79.37%(50/63)高(P<0.05);研究组发热、白带异常、下腹痛改善时间较对照组短(P<0.05);治疗后,研究组血清IL-1β、MCP-1水平较对照组低(P<0.05)。结论裸花紫珠颗粒联合替硝唑氯化钠注射液、头孢呋辛钠抗菌药物治疗CPID患者效果显著,可减轻炎症反应,改善患者临床症状。     

Dual Differentiation in Small Cell Carcinoma (Oat Cell Carcinoma) of the Lung

Two cases of small cell “undifferentiated” carcinoma (oat cell carcinoma) of the lung with dual neurosecretory and squamous differentiation are reported. One was treated with various regimens of chemotherapy and radiotherapy; the other was untreated at the time of biopsy. By electron microscopy, the same tumor cells showed membrane-bound, dense-core, neurosecretory-type granules and bundles of tonofibrils denoting squamous differentiation. This dual differentiation underlies the difficulty of ascribing an exclusively neural histogenesis to small cell carcinomas with neurosecretory-type granules. It is possible that entoderm-associated neuroectodermal tumors develop features of autochthonous entodermal tumors as a result of microenvironmental influences. An alternative hypothesis would be that small cell tumors are derived from basal reserve bronchoepithelial cells with pluripotentialities.     

Crystal-Deficient Alveolar Soft Part Sarcoma

Classically, ultrastructural examination of alveolar soft part sarcoma reveals large, dramatic, rhomboid to needlelike crystals with a characteristic substructure. In this study of four cases of alveolar soft part sarcoma, only two exhibited large crystals, which were rare. All four cases, however, exhibited round, electron-dense granules, and in the two cases without large crystals these granules rarely exhibited elongation with the characteristic substructure of alveolar soft part sarcoma that permits definitive diagnosis. Two of these cases had been previously studied at other institutions, where crystals were not identified ultrastructurally and electron microscopy was considered noncontributory. Large crystals, then, may be rare or absent in alveolar soft part sarcoma. Careful search may be necessary to find granules with the characteristic periodic substructure.     

Paclitaxel-induced stress granules increase LINE-1 mRNA stability to promote drug resistance in breast cancer cells

Abnormal expression of long interspersed element-1 (LINE-1) has been implicated in drug resistance, while our previous study showed that chemotherapy drug paclitaxel (PTX) increased LINE-1 level with unknown mechanism. Bioinformatics analysis suggested the regulation of LINE-1 mRNA by drug-induced stress granules (SGs). This study aimed to explore whether and how SGs are involved in drug-induced LINE-1 increase and thereby promotes drug resistance of triple negative breast cancer (TNBC) cells. We demonstrated that SGs increased LINE-1 expression by recruiting and stabilizing LINE-1 mRNA under drug stress, thereby adapting TNBC cells to chemotherapy drugs. Moreover, LINE-1 inhibitor efavirenz (EFV) could inhibit drug-induced SG to destabilize LINE-1. Our study provides the first evidence of the regulation of LINE-1 by SGs that could be an important survival mechanism for cancer cells exposed to chemotherapy drugs. The findings provide a useful clue for developing new chemotherapeutic strategies against TNBCs.     

养胃颗粒联合四联疗法治疗Hp阳性慢性胃炎的疗效

目的探讨养胃颗粒联合四联抗菌法治疗Hp阳性慢性胃炎的疗效及其安全性。方法选取2018年12月至2019年12月Hp相关性慢性胃炎患者120例,按照随机数字法分为对照组和观察组,各60例。对照组给予四联疗法,观察组给予养胃颗粒联合四联疗法,比较两组患者治疗有效率、Hp根除率、血液指标变化及不良反应情况。结果观察组临床治疗总有效率、Hp根除率、血清GAS水平、血清PGⅠ水平和PGⅠ/PGⅡ比值均高于对照组,差异有统计学意义(P<0.05)。结论养胃颗粒联合四联抗菌法治疗Hp阳性慢性胃炎的临床效果更优越,能显著提高Hp根除率,并可以减少消化道不良反应和肝损病例。     

复方芪苓配方颗粒治疗大鼠高尿酸血症的作用机制研究

目的 研究复方芪苓配方颗粒对高尿酸血症大鼠的降尿酸作用,并从尿酸排泄途径探讨其作用机制。方法 SD大鼠随机分为正常组、模型组、苯溴马隆组、复方芪苓配方颗粒高、中、低剂量组(9.6,4.8,2.4 g·kg-1),通过腺嘌呤灌胃及氧嗪酸钾皮下注射建立高尿酸血症模型,连续给药14 d。分别测定血清尿酸、肌酐、尿素、尿尿酸水平,计算肾脏尿酸清除率。采用RT-PCR方法分别测定动物肾脏中相关转运体的表达水平;观察肾组织病理改变。结果 与模型组比较,复方芪苓配方颗粒组高尿酸血症大鼠的血清尿酸、肌酐、尿素水平显著降低,其肾脏尿酸清除率显著升高;其肾组织病理改变显示,肾小管内尿酸盐结晶减少,肾小管-间质损伤较轻。复方芪苓配方颗粒可以显著下调肾脏尿酸盐转运体1(URAT1)、葡萄糖转运蛋白9(GLUT9) mRNA的表达,上调有机阴离子转运体1(OAT1) mRNA的表达。结论 复方芪苓配方颗粒能降低高尿酸血症大鼠的血清尿酸水平并减轻肾组织病理损害,其作用机制可能是通过调节尿酸转运体的表达水平,以降低肾脏尿酸盐重吸收能力、增加尿酸盐分泌,从而促进尿酸排泄。