Substitution at the F-ring N-imide of the indolocarbazole antitumor drug NB-506 increases the cytotoxicity, DNA binding, and topoisomerase I inhibition activities.

The antitumor drug NB-506, which is currently undergoing phase I/II clinical trials, contains a DNA-intercalating indolocarbazole chromophore substituted with a glucose residue. In addition to interacting with DNA, the drug stabilizes the topoisomerase I-DNA covalent complex. To reinforce the DNA binding and anti-topoisomerase I activities of NB-506, an analogue containing a new substituent on the naphthalimide ring F was synthesized. The N-formylamino group of NB-506 has been replaced with a more hydrophilic group, N-bis(hydroxymethyl)methylamino. In this study we show that the incorporation of a longer substituent on the N6 position effectively reinforces both the interaction with DNA and the capacity of the drug to maintain the integrity of the topoisomerase I-DNA covalent complexes. The strength and the mode of binding of the drugs to DNA were studied by complementary biophysical techniques including absorption, fluorescence, and circular and linear dichroism. Various biochemical procedures were applied to investigate the effects on human topoisomerase I using plasmid DNA as well as restriction fragments. The drug binding sites and the positions of the topoisomerase I-mediated cleavage sites were mapped with nucleotide resolution using footprinting and sequencing techniques. Cytotoxicity measurements performed with various human cancer cell lines (HCT-116, DLD-1, MKN-45) indicate that the newly designed drug is 3 to 4 times more toxic to colon and gastric cancer cells than NB-506. Therefore, the results suggest that the antitumor activity of indolocarbazole-based drugs can be enhanced by incorporating DNA and/or topoisomerase I reactive groups. They also support the hypothesis that the substituent on the imide nitrogen on the F ring of NB-506 has direct interaction with the molecular target. The study helps to define the structure-activity relationships in the indolocarbazole series of antitumor agents targeting topoisomerase I.     

石杉碱甲胶囊及片剂治疗阿尔采末病

目的;比较石杉碱甲胶囊和片剂对阿尔采末病的疗效和安全性。方法：采用双盲双模拟法将入选的６０例阿尔采末病人随机等分两组,胶囊组每次口服石杉碱甲胶囊４粒和安慰剂片４片;片剂组每次口服石杉碱甲片４片和安慰剂胶囊４粒,两组均每日两次;６０日为一疗程。     

干扰素α-1b治疗肾综合征出血热的临床疗效

目的 :观察干扰素α 1b对早期肾综合征出血热 (HFRS)的疗效。方法 :将诊断明确的早期HFRS 181例分成 2组。治疗组 94例 ,在液体综合疗法基础上给予干扰素α 1b ,10 0万U ,im ,qd ,疗程 3d ,少数重症患者适当增加剂量和疗程 ;对照组 87例仅采用液体综合疗法。结果 :治疗组用药后退热时间、低血压期、少尿期和多尿期持续时间 ,与对照组比较均明显缩短 (P <0 0 1)。治疗组未出现低血压期或少尿期 ,以及此 2期均未出现而直接进入多尿期的发生率较对照组明显升高 (P <0 0 1)。治疗组的并发症也较对照组减少。结论 :干扰素α 1b治疗早期HFRS临床疗效满意 ,不良反应少。     

论加速建立现代化中药制造工业的若干制药工程技术问题

本文针对我国中药制造工业存在的若干制药工程技术问题 ,首先着重分析了中药制药工程学的领域问题 ,指出其研究的目标和任务 ;其次 ,针对中药制药工程技术及工艺问题 ,分析了中药产品质量达不到稳定均一的原因所在 ;最后详细分析了现有中药粉碎设备、提取设备、制剂设备等中药制药设备的有关技术问题。在此基础上 ,指出了中药制造工业和国外存在的差距 ,建议加快推广先进适用的高新技术 ,优先研发中药制药过程全程质量控制技术及中药工业集成制造技术 ,以推动中药制造工业的技术进步。     

Veno-venous continuous renal replacement therapy for burned patients with acute renal failure

From 1995 to 1998, 12 burned patients with acute renal failure (ARF) were treated by veno-venous continuous renal replacement therapy (CRRT) at the Burn Unit of H?tel-Dieu de Montréal. Their mean (+/-SD) age was 51+/-12 years, and the mean burned surface covered 48.6+/-15.8% of total body surface area. All patients were mechanically ventilated and presented evidence of sepsis. The mean delay before occurrence of ARF was 15+/-6 days and ARF was mainly related to sepsis and hypotension. Main reasons for CRRT initiation were azotemia and fluid overload. A total of 15 CRRT modalities were applied (12 continuous veno-venous hemodiafiltration, CVVHDF; two continuous veno-venous hemofiltration, CVVH; and one continuous veno-venous hemodialysis, CVVHD) over 14+/-13 days. For CRRT, nine patients received heparin and three were not anticoagulated. Mean values for dialysate and reinjection flow rates were 1134+/-250 ml/h and 635+/-327 ml/h, respectively. Admission weight was 78.8+/-12.7 kg with a mean weight gain before CRRT initiation of 10.0+/-5.8 kg and a mean weight loss during CRRT of 8.9+/-5.5 kg. Nine patients received enteral plus parenteral nutrition, and three, parenteral nutrition only; the total caloric intake was 31.5+/-7.0 kcal/kg/day and protein intake, 1.8+/-0.4 g/kg/day. The normalized protein catabolic rate (nPCR) was evaluated at 2.28+/-0.78 g/kg/day during CRRT. The mortality rate was 50%. The six survivors all recovered normal renal function with four of them requiring intermittent hemodialysis for short periods. In conclusion, veno-venous CRRT is particularly well suited for this selected population allowing smooth fluid removal and aggressive nutritional support.     

宫颈癌血管内皮生长因子表达与血管生成癌细胞增殖及侵袭转移的关系

目的　研究血管内皮生长因子 (VEGF)在早期宫颈癌的表达和临床意义。方法　采用免疫组织化学SP法检测 1998年 1月至 2 0 0 2年 2月期间 75例早期宫颈癌 (ICC)、18例宫颈上皮内瘤样病变 (CIN)和 15例癌旁正常宫颈上皮 (NCE)中VEGF的表达情况 ,并检测其中微血管密度 (MVD ,CD3 4 标记 )和癌细胞增殖标记指数 (Ki 6 7标记 )。结果　从NCE→CIN→ICC ,VEGF、Ki 6 7的阳性表达率和MVD均显著升高 (P <0 0 5 )。VEGF在ICC的表达与MVD显著正相关 (r =0 6 0 2 ,P <0 0 1) ,与盆腔淋巴结转移、脉管浸润、组织学分级和Ki 6 7表达显著相关 (P <0 0 5 ) ,但与年龄、FIGO分期、组织学类型和间质浸润无关 (P >0 0 5 )。低分化、盆腔淋巴结转移、脉管浸润及Ki 6 7高度表达者 ,与VEGF阳性表达显著相关 (P <0 0 5 )。结论　VEGF阳性表达可能在宫颈癌血管生成、癌细胞增殖、癌细胞侵袭转移中起重要作用。VEGF检测对进一步了解宫颈癌生物学行为和判断其预后具有一定的临床应用价值。     

妊高征患者胎盘组织中FasL的表达及其意义

目的　探讨FasL在妊高征患者胎盘组织中的表达是否异常 ,进一步从免疫学角度分析妊高征的发病机制。方法　 2 0 0 1年 11月至 2 0 0 2年 7月 ,采用免疫组织化学SP法检测 2 0例正常孕妇 (对照组 ) ,6 5例妊高征患者 (妊高征组 ,其中轻度 2 2例、中度 2 0例、重度 2 3例 )胎盘组织中FasL表达强度。结果　FasL主要表达于胎盘绒毛滋养细胞 ,妊高征组胎盘绒毛滋养细胞及蜕膜组织细胞FasL表达强度明显低于对照组 (P <0 0 1,P <0 0 5 )。结论　妊高征患者胎盘组织FasL表达减少 ,母胎免疫耐受机制遭到破坏 ,引发胎盘绒毛发育不全、功能下降等一系列免疫病理改变 ,最终可能导致妊高征及其并发症的发生。     

透明质酸在宫颈上皮及宫颈癌组织中的表达

目的 :探讨透明质酸 (HA)在正常宫颈上皮及宫颈癌中的表达及其与肿瘤发生发展的关系。方法 :用免疫组化法检测 5 9例宫颈浸润癌、35例宫颈上皮内瘤样病变 (CIN)及11例正常宫颈组织中HA和CD4 4v6的表达。结果 :正常宫颈上皮不表达HA。慢性炎症者上皮底层细胞以及细胞间质表达HA ,随病变加重及CIN发生 ,HA表达增强。癌旁组织的上皮细胞HA呈强阳性表达 ,伴有基质HA强阳性染色。癌细胞HA阳性率为 6 7.2 7% ,与病理类型有关 ,角化癌高表达 ,而腺癌不表达 ,在低分化鳞癌中多见不规则灶性HA阴性区。宫颈鳞癌的肿瘤基质HA表达普遍增强。肿瘤基质的HA表达与CD4 4v6呈正相关。结论 :正常宫颈上皮不表达HA ,但炎症与致瘤因素可促使HA表达 ,HA的代谢失衡可能与宫颈癌的发生及浸润行为有关     

武当道药治疗风湿性关节炎100例初探

目的 :观察武当道药熏洗液熏蒸冲浪浴治疗风湿性关节炎的临床疗效。方法 :将 2 0 0例风湿性关节炎患者随机分为 3组 ,治疗组用武当道药熏蒸冲浪浴治疗 ,对照 1组用普通水熏蒸冲浪浴治疗 ,对照 2组用武当道药熏洗液浸浴治疗。结果 :总有效率治疗组 91% ,对照组 1组 6 8% ,对照组 2组 78% ,治疗组与对照 1组比较有非常显著性差异 (P<0 .0 1) ,与对照组 2组比较有显著性差异 (P<0 .0 5 ) ,且治疗组的 4项理化检查治疗后转阴率也明显优于两对照组 (P<0 .0 5～ 0 .0 1)。结论 :武当道药熏蒸冲浪浴治疗风湿性关节炎效果明显。     

不同途径免疫的AFP基因修饰DC瘤苗体内抗肿瘤效应的研究

目的:评价bcl-2反义寡核苷酸对肾细胞癌细胞Bcl-2蛋白表达抑制及诱导凋亡作用.方法:合成与已知人类基因无同源性的bcl-2反义寡核苷酸(AS1与翻译起始端互补,AS2与编码区互补),以阳离子脂质体Lipofectin为转染载体,MTS比色实验测定细胞活率,反转录-聚合酶链反应(RT-PCR)测定bcl-2 mRNA的表达,Western杂交法测定Bcl-2蛋白表达,碘化丙啶(PI)染色流式细胞术测定凋亡细胞.结果:所测定的5个肾癌细胞株均有稳定的bcl-2 mRNA表达;转染的反义寡核苷酸对ACHN细胞Bcl-2蛋白的表达有明显抑制作用,而正义寡核苷酸无明显影响,AS2的抑制作用大于AS1;反义寡核苷酸可诱导ACHN细胞的凋亡,AS1和AS2的诱导率分别为32.1%和43.2%.结论:bcl-2反义寡核苷酸可抑制肾癌细胞Bcl-2蛋白的表达,并进而诱导细胞的调亡.