脂氧素A4对心肌缺血再灌注损伤的保护作用

Objective To investigate the roles of lipoxin A4, an endegenous lipid mediator with wide anti-inflammatory fea- tures, in attenuating myocardial ischemia-reperfusion injury and the possible mechanisms. Methods Thirty male KM mice were divid- ed randomly into three groups, 10 in each: ischemia-reperfusion group (group A), lipoxin A4 (0.1 mg/kg) group (group B) and Zn- PP (Zinc protoporphyrin Ⅸ, 25 mg/kg)phus lipoxin A4 (0.1 mg/kg)group (group C). A ischemia-reperfusion heart model was de- veloped by ligating the lift anterior descending branch of the coronary artery. A dine of 10% dehydrated alcohol in 0.2 ml for group A, a dose of isochoric lipoxin A4 for group B and a dose of isochoric ZnPP + lipoxin A4 for group C was infused into the ascending aorta through a catheter, which was kpassing the right common carotid artery, 30 minutes after reperfusion. The concentration of serum TNF-α, activities of serum crestine kinase(CK) and lactate dehydrogenase (LDH), activities of myeloperoxidase (MPO) and malond- ialdehyde (MDA) and the cell apoptosis rate in the myocardial tissue were measured 5 hours after reperfusion. Pathological features of the inflammatory infiltration in the myocardium were also observated.Results As compared with group A, the inflammatoryry infiltra- tion in the ischemic and necrotic regions tithe myocardium was reduced, with group C in the intermediate range. The serum activities of CK and LDH wine significantly lower in group B and C than that in group A, and the lowest activities were detected in group B. Similar findings were observed for MPO, an indicator for neutrophil infiltration, and MDA, an indictor for cell injury caused by oxy- gen radicals, in the myocardium. The concentration of TNF-α and the rate of cadiocyte apoptosis were decreased significantly in group B(P < 0.01). ZnPP, an inhibitor of heine oxygenase (HO)-1, attenusted the above protective effects of lipoxin A4 significantly (P<0.05). Conclusion Lipoxin A4 has protective effects against myocardial ischemia-reperfusion injury, and HO-1 may have a potential role in the protectve mechanisms of lipoxin A4, probably pertly by means of reducing the production of reactive oxygen spe- cies and TNF-α, decreasing the activation and infiltration of neutrophils, alleviating inflammatory damage and avoiding apoptosis.     

食管胃吻合口-胸腔瘘的影像学诊断和介入治疗

目的：探讨食管胃吻合口-胸腔瘘的影像学特征及其介入治疗方法。方法：回顾性分析6例具有完整临床资料的食管胃吻合口-胸腔瘘的口服碘水造影及CT表现；透视下，置入蘑菇状覆膜内支架封堵瘘口。结果：6例口服碘水造影显示对比剂均经吻合口溢入胸腔；6例螺旋CT检查，其中5例显示吻合口与胸腔相通，1例瘘口小而未显示。全部病例顺利置入内支架，既完全封堵了瘘口，又解决了进食问题。结论：根据口服碘水造影和螺旋CT征象可以诊断食管胃吻合口-胸腔瘘，置入蘑菇状覆膜内支架封堵瘘口操作简单、安全、近期疗效明显，是一项值得推广的新技术。     

邻苯二甲酸二乙基己酯对新生小鼠睾丸及Leydig细胞影响的实验研究

目的:探讨邻苯二甲酸二乙基己酯(DEHP)对新生小鼠睾丸及Leyd ig细胞形态结构及功能的影响。方法:DEHP分别以低、中、高3组剂量[100、200、500 mg/(kg.d)]灌胃作用于怀孕12 d到产后3 d(GD12~PND3)的KM母鼠,观察DEHP对新生雄性仔鼠体重、睾丸重量、Leyd ig细胞形态结构和3β-羟基类固醇脱氢酶(3-βHSD)活性、酶反应面积的影响。结果:DEHP作用于母鼠后,其雄性子代幼鼠体重和睾丸重量减轻,睾丸Leyd ig细胞形态、超微结构发生改变;高剂量组Leyd ig细胞数量明显增多;低、中剂量组睾酮合成关键酶3β-HSD酶活性下降,酶反应面积减小,但高剂量组在仔鼠出生后15 d时酶活性降低[(吸光度值(0.154±0.011)vs空白对照组(0.222±0.013),P<0.01],而酶反应面积增大[(6 303.0±745.6)μm2vs空白对照组(5 091.4±214.4)μm2,P<0.01)]。结论:DEHP能影响新生雄性小鼠体重、睾丸重量、Leyd ig细胞的形态结构和3β-HSD活性,具有抗雄激素效应。     

静注碳酸氢钠联合西比灵治疗眩晕50例临床观察

我院2001年2月～2003年10月试用静脉注射5％碳酸氢钠佐以口服西比灵治疗眩晕50例，获得良好效果，报告如下：     

柱色谱-紫外分光光度法测定广金钱草中总黄酮的含量

目的建立广金钱草中总黄酮的含量测定方法。方法选用测定波长272nm，以6-C-葡萄糖-8-C-木糖洋芹素(vicenin-2)为对照品，采用柱色谱-紫外分光光度法对不同来源的广金钱草进行了总黄酮的含量测定。结果vicenin-2在10．8～25．2μg／mL具有良好的线性关系，回归方程为Y=0．0309x 0．016(r=0．9999)，平均回收率为100．82％，RSD为1．30％。结论该方法操作简便，结果准确，重复性好，可用于广金钱草的质量控制。     

高晶体-高胶体渗透压混合液对失血性休克大鼠血浆及不同组织中血管紧张素Ⅱ水平的影响

高晶体-高胶体渗透压混合液(HHS)在失血性休克的早期复苏中具有等渗溶液不可比拟的优越性，其可能的机制包括：扩容、改善心功能、降低外周血管阻力、改善免疫功能以及调节内分泌功能等。肾素．血管紧张素系统(RAS)在失血性休克后内分泌的变化中起重要作用。RAS最重要的产物就是血管紧张素Ⅱ(AngⅡ)。有研究表明，高渗盐水及羟乙基淀粉(HES)均有降低循环中AngⅡ的作用，但HHS输注对休克时不同组织内RAS的影响尚未定论。本研究拟通过大鼠失血性休克模型，观察休克及液体复苏对血浆及下丘脑、垂体前叶、肾上腺中AngⅡ水平的影响。     

糖耐量受损患者血清铜锌及SOD、MDA含量的研究

氧化应激是指体内氧自由基产生增加及抗氧化能力减弱，它在糖尿病（DM）及其并发症的发生发展中起重要作用。糖耐量受损（IGT）是DM的早期阶段，可逐步发展为DM。为了研究IGT患的氧化应激状态，作检测了IGT患血清铜锌与CuZn—SOD和总SOD及MDA（丙二醛）的含量，现将结果报道如下。     

γ-氨基丁酸受体基因多态性与特发性癫痫的相关性研究

目的探讨GABA受体基因GABBR1多态性在特发性癫痫发病（IGE）中的作用。方法采用PCR、琼脂糖凝胶电泳技术分析46例IGE患者（研究组）rs3025627、rs3025628和rs29220基因型频率变化，并与50例健康查体者（对照组）比较。结果观察组与对照组rs3025627TT基因型频率分别为0．362、0．245，P〈0．01，rs3025627AT基因型频率分别为0．354、0．447，P〈0．05。两组rs3025628和rs29220基因型频率无统计学差异（P〉0．05）。结论rs3025627基因型频率改变可能是导致GABBR1基因外显子7在IGE病中起作用的原因。     

Expression and significance of HIF-1α and ET-1 in gastrointestinal stromal tumors

Objective To explore the expression and the value of HIF-1α,and ET-1 in judging the prognosis of gastrointestinal stromal tumors (GISTs). Methods The expression of HIF-1α, and ET-1 protein was examined in 76 GISTs by immunohistochemistry S -P methods. Results There was a positive correlation between the expression of HIF-1 α and ET-1 ( P < 0.05 ). The positive expression rate of HIF-1 α and ET-1 was 73.68% (50/76) ,and 65.79% (50/76) respectively,which was related with histologicial grade, tumor diameter, infiltration and metastasis, nuclear division rating of GISTs ( P < 0.05 ), but had no relationship with patients' age, gender, initial position of the tumor ( P > 0.05 ). There was statistically sig-nificant difference in the expression of HIF-1 α and ET-1 in the following groups:among the three classes of very low-risk and low-risk, middle-risk, high-risk, bewteen the diameter < 2 cm and > 5 cm (P < 0.05). The more malignant degree and larger diameter, the more highly positive expression rate ( P < 0.05 ). The positive expression in the groups with infiltration and metastasis, and nuclear division ≥5/50 HP was sig-nificantly higher than the groups without infiltration and metastasis, and nuclear division < 5/50 HP (P < 0.05). Conclusion The expression of HIF-1α had a significant correlation with ET-1. HIF-1α,and ET-1 expression was closely related with the prognosis of GISTs,and can serve as important predictors for survival.     

The expression of β-adrenoceptors in human pancreatic cancer cell lines and their roles in cell invasiveness

Objective To investigate the effect and mechanism of β-adrenoceptors on norepi-nephrine-induced invasiveness of pancreatic cancer cell lines. Methods The expression of β-adrenocep-tors mRNA in human pancreatic cancer cell lines MiaPaCa-2 and BxPC3 was detected by using RT-PCR. The cells were randomly divided into control group.10 mol/L NE intervention group, 1 mol/L propranolol intervention group and NE + propranolol intervention group. After 48 h , transwell invasiveness test was used to examine the changes in invasive ability of MiaPaCa-2. The expression of MMP-2, MMP-9 and VEGF mRNA was measured by semi-quantitative RT-PCR. The levels of MMP-2 , MMP-9 and VECF proteins were assayed by immunocytochemistry. Results Both MiaPaCa-2 and BxPC3 expressed β1-and β2-adrenocep-tors. The absorbance ( A) values of invasive cells in NE, NE + propranolol, propranolol and control groups were 0.78±0.02 ,0.32±0.03 ,0.26±0.01 and 0.28±0.02 , respectively, and those in NE intervention group were significantly higher than in control and NE + propranolol groups ( P <0.05) . There was no sig-nificant difference in the number of invasive cells between propranolol and control groups ( P > 0. 05) . In NE group , the expression index of MMP-2 , MMP-9 and VEGF mRNA was 0. 87±0.02 , 1.04±0.02 and 0. 92±0. 01 , and the gray value of the protein expression was 131.20±2.34,105.32±7.21 and 115.60 ±5. 03 , respectively, which were higher than those in control and NE + propranolol groups ( P<0.05). There was no significant difference in the expression levels of MMP-2 , MMP-9 and VEGF mRNA and pro-tein between propranolol and control groups ( P>0.05 ) . Conclusion β-adrenoceptors play an important role in the process of norepinephrine-induced invasiveness of pancreatic cancer cells. NE can promote the invasiveness of MiaPaCa-2 through up-regulating the expression of MMP-2 , MMP-9 and VEGF via β-adre-noceptors.