补肾化瘀解毒方药物血清对肺癌A549/DDP细胞的耐药逆转及MRP表达的影响

目的：探讨补肾化瘀解毒方药物血清对肺癌细胞耐药逆转作用及机制。方法:采用MTT及流式细胞术，分别观察补肾化瘀解毒方药物血清对肺癌A549/DDP耐药细胞的细胞毒作用和多药耐药相关蛋白（MRP）表达的影响。结果:补肾化瘀解毒方药物血清对肺癌耐药细胞有一定的杀伤作用，能增强顺铂（DDP）对肺癌敏感细胞和耐药细胞的杀伤作用，显著降低MRP的表达（P＜0.01），但对维拉帕米（VRP）的协同逆转作用不明显。结论:补肾化瘀解毒方药物血清具有增效和耐药逆转作用，其机制可能与其抑制肺癌耐药细胞MRP的表达有关。     

链脲佐菌素诱导的糖尿病早期小鼠胸主动脉钾通道变化

目的:探讨链脲佐菌素诱导的糖尿病早期小鼠胸主动脉钾通道的变化。方法:实验采用离体血管的方法测定糖尿病鼠和正常鼠胸主动脉环对血管收缩剂:60mmol/LKCl和苯肾上腺素(PE)、内皮非依赖性舒张剂:硝普钠(SNP)以及电压依赖性钾通道(K_V通道),钙激活型钾通道(K_Ca通道),ATP敏感钾通道(K_ATP通道)阻断剂的反应。结果:糖尿病鼠胸主动脉环对60mmol/LKCl、PE和SNP的效应都显著大于对照组;K_Ca通道阻断剂四乙铵(TEA)显著降低糖尿病小鼠胸主动脉环在PE的激动下SNP的舒张效应,而且其-logIC₅₀的差值较对照组显著增大;K_V通道阻断剂4-氨基吡啶(4-AP)显著降低糖尿病和正常小鼠胸主动脉环对SNP的舒张效应,但是-logIC₅₀差值无显著差异;K_ATP通道阻断剂格列苯脲(Glibenclamide)显著降低糖尿病小鼠胸主动脉环对SNP的舒张效应,而对照组无显著阻断作用,-logIC₅₀的差值也无显著差异。结论:糖尿病早期小鼠胸主动脉平滑肌细胞K_Ca通道的开放或表达显著增强,也证实了K_ATP通道开放增强。     

R497K polymorphism in epidermal growth factor receptor gene is associated with the risk of acute coronary syndrome

Background  

Previous studies suggested that genetic polymorphisms in the epidermal growth factor receptor (EGFR) gene had been implicated in the susceptibility to some tumors and inflammatory diseases. EGFR has been recently implicated in vascular pathophysiological processes associated with excessive remodeling and atherosclerosis. Acute coronary syndrome (ACS) is a clinical manifestation of preceding atherosclerosis. Our purpose was to investigate the association of the EGFR polymorphism with the risk of ACS. In this context, we analyzed the HER-1 R497K and EGFR intron 1 (CA)_n repeat polymorphisms in 191 patients with ACS and 210 age- and sex-matched controls in a Chinese population, using a polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) strategy and direct sequencing.     

Computer analysis system of blood oxygen saturation in an animal hypoxia model

An experimental animal hypoxia model has been developed. It consists of two sensors (an in vitro and in vivo model), an experimental device and a computer signal processing system. This method can easily be applied to determine and analyse blood oxygen saturation at various hypoxia levels. It can also be used to evaluate the accuracy of pulse oximetry over a wide range of oxyhemoglobin desaturation levels. The DC and AC components of recorded red and infra-red signals, the dual-wavelength ratio R₁₂ and the reading of a pulse oximeter (SpO₂) can be automatically calculated and displayed on a computer screen. Preliminary results of the animal hypoxia test indicate that the measurements made by the instrument correlate well with the oxygen saturation readings of the automatic blood gas analyser AVL945. The computer analysis system is suitable for repeated estimations in the animal model.     

医院实施ISO9001质量管理体系内部审核的探讨

医疗机构实施ISO9001,其目的是为了提高医疗服务质量,满足病人一切明确和隐含的需求。那么,内审是否发挥作用,直接关系管理体系的有效性。文章对此进行了初步的探讨,即:①明确内审的目的是检查体系满足标准要求的程度;②建立正规的内审机构,要选拔责任心强、综合素质高的人担任内审员;③编制合理且有特色的内审计划,是内审有效性的关键;④适当增加专题审核;⑤医院最高管理者应重视内审结果。     

苦瓜提取物对实验性Ⅱ型糖尿病大鼠的血糖的影响

目的:观察苦瓜提取物对链脲霉素引起的Ⅱ型糖尿病大鼠模型的血糖、血清胰岛素及血脂的影响。方法:大鼠尾静脉注射小剂量链脲霉素25mg·kg-1,同时喂以高糖高脂饲料复制Ⅱ型糖尿病大鼠模型.然后给予苦瓜提取物14,28,56mg·kg-1,连续灌胃给药4周后,测定血糖、血清胰岛素及血脂。结果:苦瓜提取物14,28,56mg·kg-1能降低实验性Ⅱ型糖尿病大鼠血糖及血清胰岛素水平,能升高HDL-C含量,而对血脂其它指标无明显影响。结论:苦瓜提取物对Ⅱ型糖尿病大鼠有治疗作用。     

磷酸钙人工骨(CPC)在颈前路椎间融合的临床应用

目的探讨磷酸钙人工骨(CPC)在颈椎前路椎间融合手术中的应用效果。方法2001年4月至2003年10月颈前路手术中应用磷酸钙人工骨栓椎间融合结合钛钢板固定治疗颈椎病17例,颈椎间盘突出症5例,颈椎外伤脱位2例,共24例35个节段。采用JOA评分评价神经功能,X线片判定融合效果。结果随访18±6.5个月,术后无感染,无过敏或毒性反应。JOA评分由术前9.28±2.15分增加到14.65±2.18分(P<0.001)。术后X线片未见CPC骨栓塌陷或移位,钛板和螺钉无松动及折断。术后16.5±6.8个月均获得椎间融合。结论颈椎前路椎间融合手术应用磷酸钙人工骨替代自体骨,经济、安全、简便、效果可靠。     

IL-17 Eliminates the Therapeutic Effects of Myelin Basic Protein-Induced Nasal Tolerance in Experimental Autoimmune Encephalomyelitis by Activating IL-6

Interleukin (IL)-17 is a proinflammatory cytokine primarily secreted by Th17 cells, which are a CD4⁺ T-cell subset. Th17 cells and IL-17 are important in the pathogenesis of multiple sclerosis and in its established animal model, experimental autoimmune encephalomyelitis (EAE). However, it is unclear whether IL-17 contributes to EAE immune tolerance. We used the myelin basic protein (MBP) peptide MBP 68–86 to induce nasal tolerance to EAE, and simultaneously interfered with the tolerance by treatment with different doses of IL-17. We found that IL-17 dramatically interfered with MBP 68–86-induced immune tolerance. IL-17 administration increased IL-6 release, skewing T cell differentiation towards Th17 cells and decreasing the number of Treg cells. This led to an imbalance between Treg cells and Th17 cells and spurred the development of EAE.     

Ketamine inhibits LPS-induced calcium elevation and NF-kappa B activation in monocytes

Objective:To investigate whether ketamine could inhibit lipopolysaccharide (LPS)-induced intracellular calcium elevation and NF-kappa B activation in monocytes. Materials and methods:Isolated rat monocytes were challenged with 10 g/ml LPS with or without the presence of various concentrations of ketamine (10, 100, 1000 M). Intracellular calcium was monitored by laser confocal microscopy. NF-kappa B activity of the nuclear extracts of monocytes was analyzed by electrophoretic mobility shift assay (EMSA). Results:LPS provoked a significant calcium elevation and enhanced NF-kappa B activity in monocytes. Ketamine above concentration of 100 M inhibited endotoxin-induced intracellular calcium elevation and NF-kappa B activity. Ketamine itself had no effect on either of them. Conclusions:These findings suggest that ketamine could suppress NF-kappa B in monocytes exposed to endotoxin, and this anti-inflammatory effect might act through attenuating intracellular calcium elevation.Received 31 October 2003; returned for revision 18 December 2003; accepted by I. Ahnfelt-Rønne 26 Januaryy 2004