肝癌多药耐药产生与低糖环境的关系

目的探讨局部微环境低糖与肝细胞癌多药耐药性(MDR)产生的关系及影响机制。方法低糖培养HepG2细胞,应用流式细胞术Annexin V/PI法检测低糖培养的细胞在化疗药物5-氟脲嘧啶(5-Fu)作用后的凋亡情况,分别应用荧光定量聚合酶链反应(PCR)技术和Western blot技术检测低糖培养后HepG2细胞内多药耐药相关基因mdr1、MRP1、LRP的mRNA和蛋白水平的表达。结果在低糖环境下生长时间越长的HepG2细胞对5-Fu的抵抗越强,而且随着低糖培养时间的增加,5-Fu诱导的HepG2细胞的凋亡高峰延迟。低糖培养的HepG2细胞内多药耐药相关基因mdr1、MRP1、LRP在mRNA和蛋白水平的表达随低糖培养时间的延长而升高,以LRP的改变最为显著。结论肝癌生长微环境葡萄糖耐量不足也是肝癌产生MDR的原因之一。低糖可通过上调一组多药耐药相关基因的表达而诱导肝癌的多药耐药性。     

脂肪抽吸术对胰岛素敏感性及脂质代谢的影响

目的了解脂肪抽吸术对胰岛素抵抗与脂质代谢的影响,并探讨其临床意义。方法对20例接受腹部脂肪抽吸术者术前及术后2个月的血清三酰甘油、总胆固醇、高密度脂蛋白胆固醇、低密度脂蛋白胆固醇,胰岛素敏感性进行测量并进行比较。结果术后与脂肪抽吸术前比较,术后胰岛素敏感性增强（P〈0.01）,血清总胆固醇与低密度脂蛋白胆固醇水平下降。结论腹部脂肪抽吸术在去除大量皮下脂肪的同时,对胰岛素抵抗、脂质代谢等心脑血管危险因素也有非常有益的影响。     

老年护理院医院感染病原菌及其耐药特征分析

目的探讨目前老年护理医院院内感染病原菌及其耐药特征。方法对2000年4月-2004年3月徐汇区两家老年护理院出院病人的病史进行统计分析。结果两家老年护理院共计发生医院感染939例次，医院感染率12．86％，检出病原菌284株，阳性率30．28％；病原菌以革兰阴性菌为主，占44．65％，其次为真菌、革兰阳性菌，分别为29．12％、25．92％，位于前3位的病原菌分别为其他真菌（14．36％）、白色念珠菌（12．23％）、铜绿假单胞菌（8．69％）；除嗜麦芽寡养单胞菌外，革兰阴性菌以亚胺培南最敏感，敏感率87％，对氨苄西林、阿莫西林的耐药率〉51％，对头孢哌酮、哌拉西林的耐药率〉33％；MRSA和MRSE的检出率高达86．76％和76．32％；混合感染率34．51％。结论老年护理院医院感染率高．真菌所占的比例高；细菌对抗菌药物的耐药性相当严重。     

胰岛素抵抗和脑血管病关系的研究

目的：探讨胰岛素抵抗与脑梗死、脑出血的关系，为针对胰岛素抵抗的治疗可以有效地预防脑血管疾病提供理论依据。方法：选取42例脑梗死（脑梗死组）、40例脑出血（脑出血组）及30例非脑血管病患者（对照组），分别测定空腹胰岛素（FINS）、空腹血糖（FBG），计算胰岛素敏感指数（ISI），各组间进行比较。结果：脑梗死组和脑出血组患者ISI低于对照组（P〈0.05），而FINS高于对照组（P〈0．05），FBG与对照组差异无统计学意义（P〉0．05）。结论：胰岛素抵抗可能是脑血管病的一个重要危险因素。     

Role of retinol in protecting epithelial cell damage induced by Clostridium difficile toxin A

Vitamin A (retinol), a fat-soluble vitamin, is an essential nutrient for the normal functioning of the visual system, epithelial cell integrity and growth, immunity, and reproduction. Our group has investigated the effect of high doses of oral vitamin A on early childhood diarrhea in our prospective community-based studies from Northeast Brazil and found a beneficial role in reducing the mean duration but not incidence of diarrheal episodes. In this study, we explored the role of retinol supplementation in intestinal cell lines following Clostridium difficile toxin A (TxA) challenge. C. difficile is the most common anaerobic pathogen borne with antibiotic-borne diarrhea and pseudomembranous colitis. Since retinol is critical for the integrity of tight junctions and to modulate the cell cycle, we have focused on changes in transepithelial electrical resistance (TEER) in Caco-2, a more differentiated intestinal cell line, and on models of cell proliferation, migration and viability in IEC-6 cells, an undifferentiated crypt cell line, following TxA injury. In this model, retinol therapy reduced apoptosis, improved cell migration and proliferation, and prevented the reduction in TEER, following C. difficile TxA challenge in a glutamine-free medium. These results suggest the role of retinol in protecting intestinal epithelial barrier function from C. difficile TxA enterotoxic damage.     

2003-2005年新生儿感染常见致病菌及耐药性的变迁

目的了解本地区新生儿2003至2005年感染常见致病菌的种类及耐药的现状，以指导临床合理应用抗生素。方法收集我院新生儿科2003年1月至2005年12月收治的613份体液培养阳性（痰液、血液、分泌物、胃液等标本）的患儿资料，对常见检出菌及其耐药性的变迁情况进行分析。结果共检出40种613株病原菌，以革兰阴性杆菌为主约占57．6％，而肺炎克雷伯菌和大肠埃希菌分别位于前二位，其产ESBLs菌株检出率分别为78．1％和82．6％。药敏结果显示，常见致病菌对青霉素、第一、二代头胞类抗生素、红霉素类耐药性显著增加，但对第三代头胞类抗生素如头孢曲松、头孢噻肟（凯福隆）、头孢他啶（复达欣）及B内酰胺酶抑制剂复方制剂、碳青霉烯类、万古霉素等较敏感。产ESBLs菌仅对亚胺培南及B内酰胺酶抑制剂复方制剂敏感。结论革兰阴性杆菌特别是肺炎克雷伯菌和大肠埃希菌是新生儿感染主要病原菌，产ESBLs菌比例增加应引起高度重视。碳青霉烯类、哌拉西林／三唑巴坦和头孢哌酮／舒巴坦，可作为新生儿严重医院感染经验用药，应尽量根据药敏试验调整抗生素。     

Bacterial ghosts (BGs)—Advanced antigen and drug delivery system

Bacterial ghosts (BGs) are empty bacterial envelopes of Gram-negative bacteria produced by controlled expression of cloned gene E, forming a lysis tunnel structure within the envelope of the living bacteria. BGs are devoid of cytoplasmic content and possess all bacterial bio-adhesive surface properties in their original state while not posing any infectious threat. BGs are ideally suited as an advanced drug delivery system (ADDS) for toxic substances in tumor therapy. The inner space of BGs can be loaded with either single components or combinations of peptides, drugs or DNA which provides an opportunity to design new types of (polyvalent) drug delivery vehicles. Uptake of BGs loaded with Doxorubicin (Dox) by CaCo2 cells led to effective Dox release from endo-lysosomal compartments and accumulation in the nucleus. Viability and proliferative capacity of the cells were significantly decreased (2–3 orders of magnitude) after internalization of Dox loaded BGs as compared to cells incubated with free Dox. The same effect was observed with leukemia cells. Melanoma cells also revealed a high capability to internalize BGs. These results indicate that BGs are able to target a range of types of cancer. BGs have also been investigated as DNA delivery vectors. Studies show DNA loaded BGs are efficiently phagocytosed and internalized by both professional APCs and tumor cells with up to 82% of cells expressing the plasmid-encoded reporter gene. Our studies with BGs as an ADDS system contribute (i) to optimize drug delivery for the treatment of cancer; (ii) define specific conditions for selection and preparation of BG formulations; (iii) and provide a background for the clinical application of BGs in cancer therapy.     

德国小蠊抗药性及其抗性衰退情况研究

目的了解德国小蠊的抗药性及抗药性衰退情况.方法以点滴法测定德国小蠊对溴氰菊酯、敌敌畏、二氯苯醚菊酯、残杀威等的抗药性及抗药性衰退情况.结果现场品系分别为0.098、0.490、5.612、0.741ug/虫,正常饲养1年后抗性分别为0.086、0.232、3.412、0.317ug/虫,5年后抗性分别为0.008、0.123、0.410、0.0811ug/虫,LD50最高为二氯苯醚菊酯,1年后抗性衰退倍数范围为1.14～2.39,5年后抗性衰退倍数范围为3.98～13.69.结论具有高等抗性德国小蠊经实验室饲养5年后抗性基本衰退.     

132例男性不育患者遗传学病因分析

目的：对男性不育患者进行遗传学病因分析，并探讨其遗传效应。方法：采取132例男性不育患者外周血进行染色体核型分析。结果：132例男性不育患者中，染色体异常24例，染色体变异22例。其中大Y20例，47，XXY18例，45．XY，t(13；14)3例，小Y和46，XY，inv(9)各2例，46，XY，t(9；22)1例。结论：染色体异常是男性不育的重要原因，并建议男性不育患者进行基因诊断，以便确诊是否属于遗传病，为生育提供指导，避免盲目治疗。