降纤酶对血栓形成和光化学诱导大鼠脑缺血的影响

目的:探讨降纤酶对血栓形成和光化学诱导大鼠脑缺血的影响。方法:①对血栓形成的影响:10只大鼠分为生理氯化钠溶液对照组及降纤酶治疗组(每组各5只),采用微循环方法观察降纤酶治疗后肠系膜血栓溶解情况,分别在光照后1,2,5,10min记录对照组及治疗组血栓体积及占管腔体积比。②对光化学诱导大鼠脑缺血的影响:72只大鼠以光化学法制成左顶叶皮层缺血模型,治疗组于缺血后1,3,6,9,12,24h由尾静脉注射降纤酶8U·kg~(-1)),对照组按相同时间点用等量生理氯化钠溶液尾静脉注射。进行神经功能评分,缺血48h后处死,标本用HE及TTC染色,观察梗死灶病理改变及测定梗死灶体积。结果:①对血栓形成的影响:降纤酶治疗组血栓体积明显减小,占管腔体积百分比减少,与对照组相比有显著性差异(P<0.05)。②对光化学诱导大鼠脑缺血影响:缺血1,3,6h治疗组神经功能评分改善,脑梗死体积明显减小,与对照组相比有极显著性差异(P<0.01),相应时间点病理改变轻于对照组。缺血9h给药组神经功能评分有改善,脑梗死体积亦较对照组小,统计学有显著差异(P<0.05)。12和24h治疗组与对照组相比无显著差异(P>0.05)。结论:降纤酶能有效溶解肠系膜血栓并减小光化学诱导大鼠脑梗死体积。     

大豆黄酮对卵巢切除大鼠鼻黏膜上皮细胞凋亡的保护作用

目的　观察双侧卵巢切除诱导大鼠鼻黏膜上皮细胞凋亡 ,研究尼尔雌醇、大豆黄酮对此的保护作用。方法　将 60只大鼠随机分为 4组 :健康对照组 ,卵巢切除组 ,卵巢切除 +尼尔雌醇组 ,卵巢切除 +大豆黄酮组。各组动物分期分 3批处死 ,流式细胞仪检测各组动物鼻中隔黏膜的早期凋亡细胞。结果　双侧卵巢切除后 ,大鼠鼻黏膜的早期凋亡细胞百分数增高 ,术后 60d达到新的平衡。大豆黄酮、尼尔雌醇干预组与健康组比较 ,早期凋亡细胞无明显改变。结论　雌激素替代和大豆黄酮可通过减少凋亡细胞而保护鼻黏膜免受雌激素缺乏的损害     

Anticancer Drug Resistance of HeLa Cells Transfected With Rat Glutathione S-transferase pi Gene

Objective To establish a cytologic expressing system of rat glutathione S-transferase pi (GST-pi) cDNA for detecting the resistance of HeLa cells to anticancer drugs. Methods The assessment was made with various anticancer drugs (adriamycin, mitomycin, cisplatinum and vincristine) that showed different cytotoxicities in transfectant HeLa cells with pSV-GT containing rat GST-pi cDNA (HeLa/pSV-GT) or control pSV-neo (HeLa/pSV-neo). Expression levels of GST-pi mRNA in HeLa/pSV-GT and HeLa/pSV-neo were measured by in situ hybridization using Digoxin-labelled cDNA probe. Results HeLa/pSV-GT expressed significantly high degree of GST-pi mRNA, whereas both HeLa/pSV-neo and HeLa cells had very low expression. Cytotoxicities of HeLa/pSV-GT and HeLa/pSV-neo with 4 anticancer drugs were measured by MTT assay. Drug concentrations for yielding 50% inhibition (IC50) in HeLa/pSV-GT by adriamycin, mitomycin and cisplatinum were 70.13μg/mL, 10.95μg/mL and 16.52μg/mE respectively. In contrast, IC50 in HeLa/pSV-neo was 10.34μg/mL, 7.48μg/mL and 13.70μg/mE respectively. The cytotoxicities of vincristine on both HeLa/pSV-GT and HeLa/pSV-neo were not significantly different. Conclusions Our findings suggest that HeLa/pSV-GT containing rat GST-pi cDNA is resistant to some anticancer drugs due to overexpression of GST-pi. Also, HeLa/pSV-GT cell line could serve as a useful cytogenetic model for further research.     

Effects of Fat-soluble Extracts From Vegetable Powder and β-carotene on Proliferation and Apoptosis of Lung Cancer Cell YTMLC-90

Objective The aim of this investigation was to study the effects of fat-soluble extracts from vegetable powder (FEFVP) and β-carotene on the proliferation and apoptosis of cultured YTMLC-90 lung cancer cells. Methods The lung cancer cells were continuously exposed to a broad range of concentration of FEFVP and [3-carotene. The proliferation was evaluated in MTT test. The induction of apoptosis was evaluated by morphological change, DNA fragmentation analysis, and DNA content analysis combined with flow cytometric analysis. Results Both FEFVP and β-carotene were found to inhibit cell proliferation and to induce morphologic changes consistent with apoptosis in YTMLC-90 cancer cells, including cellular shrinkage, chromatin condensation and nuclear fragmentation. DNA agarose gel electrophoresis showed DNA fragmentation ‘ladder‘‘. Flow cytometric analysis revealed decreased DNA content and the presence of a sub-G1 apoptotic peak.Conclusion These findings are consistent with the induction of apoptosis. Moreover, the effects of FEFVP are stronger than those of β-carotene. FEFVP inhibits the growth of YTMLC-90 probably via the induction of apoptosis cancer cells.     

蓖麻油引产餐用于晚期妊娠临床观察

20 0 0年 12月至 2 0 0 1年 12月 ,对我院 2 0 0例没有引产、催产禁忌证的晚期妊娠的孕妇 ,予口服蓖麻油引产餐以帮助引产或催产 ,并收到了较好的效果 ,现报道如下。临床资料一、研究对象 :为孕周 37～ 4 3周 ,无明显头盆不称、胎儿宫内窘迫等引产、催产禁忌证而又因各种原因需要终止妊娠的住院孕妇 ,共 2 0 0例 ,其中初产妇 187例、经产妇 13例 ,年龄 2 2～ 35岁。二、临床分组 :以服餐时有无宫缩将上述对象分为引产组和催产组 ,即无宫缩者为引产组 ,计 15 4例 ;有不规则宫缩者为催产组 ,计 4 6例。并取同期未服用蓖麻油引产餐的经阴道正常…     

地黄不同方法提取物制剂降糖作用的实验研究

水煎煮中药是中成药生产中最常用的提取方法 ,亦符合传统中医用药习惯。我们的研究表明 ,地黄、黄芪、丹参配伍的中药复方具有改善糖尿病患者的症状和一定的降糖作用[1、2 ] 。鉴于地黄水煮提取物的量很大 ,超出生药干重量的 5 0 % ,不适用于制成胶囊剂。为了减少地黄提取物的总量 ,而又不影响其效果 ,我们观察了地黄水提、醇提及水醇法提取物制剂对小鼠肾上腺素诱发高血糖的降糖作用 ,以寻找合适工艺。1　材料与方法1.1　药物　全部中药材购自贵阳市药材公司。 (1)丹参水煮二次 ,第一次 2h ,第二次 1h ,过滤 ,合并滤液 ,浓缩至相对密度为 1…     

蒽环类抗肿瘤药物治疗儿童急性白血病

蒽环类药物作为抗肿瘤抗生素已被越来越广泛地应用到恶性血液系统肿瘤的治疗中。本文就儿童急性白血病治疗中常用的蒽环类代表药物进行简单的评述。     

氟喹诺酮类抗菌药的安全性

氟喹诺酮是目前广泛用于临床对付多种感染性疾病的一类安全性相对较高的抗菌药，其常见的不良反应(胃肠道紊乱、中枢神经系统反应、皮肤反应和药物相互作用等)程度轻微且具有可逆性。某些品种因上市后经大规模使用逐渐出现严重的毒副作用而撤出市场或被严格限制使用。对此应该引起人们的高度重视。本文根据瑚mI皿iE搜索1980年以来所有涉及氟喹诺酮安全性的二百多篇文献以及近期9篇会议报道对这类药物，特别是目前临床上使用的品种的安全性进行了综述，以达到安全有效的合理用药之目的。     

注射用司帕沙星的溶血试验

目的　观察注射用司帕沙星在试管内对新西兰白兔有无溶血、凝集作用。 方法 　取规定量受试药加入 2 %兔血生理盐水混悬液中 ,观察溶血和凝集情况。 结果 　第一～六管溶液中红细胞全部下沉 ,上层液体无色澄明 ,第七管全部溶血。 结论 　注射用司帕沙星在终浓度 1mg·m L- 1时 ,对兔红细胞无溶血和凝集现象。