冠状动脉病变与大动脉弹性的相关性研究

目的:将临床常用的血压测定和外周动脉超声技术相结合,研究冠状动脉(冠脉)病变与大动脉弹性的相关性。方法:对所有入选病例行冠脉造影(CAG)检查,用Gensini法行冠脉病变评分,并根据CAG结果分为冠心病(CHD)组和正常对照组。于CAG前或后进行双侧颈动脉和心脏彩色多普勒检查,并测量血压、血糖、血脂、身高和体重。结果:CHD组与正常对照组比较,反映动脉弹性的脉压(PP)、PP指数(PI)、颈总动脉平均管壁张力(CWS)差异有统计学意义(P<0.01);反映早期动脉粥样硬化(CAS)的颈总动脉内-中膜增厚与SBP、PP、PI正相关,与CWS负相关,且与CWS及SBP的相关程度最高(标准回归系数为-0.799和0.392);反映冠脉AS程度的冠脉评分与PI、PP正相关,与CWS负相关,且与CWS和PP的相关程度最高(标准回归系数为-0.462和0.236)。结论:AS病变可致动脉弹性下降;早期AS与中央动脉弹性下降有关;冠脉硬化病变及其病变程度与颈动脉弹性密切相关。     

Ras-MAPK通路在食管癌中的研究进展

Ras is best known for the ability of regulating cell growth, proliferation and differentiation. Mutations in Ras are associated with abnormal cell proliferation, resulting in the incidence of all human cancers. Mitogen-activated protein kinase (MAPK) signaling pathways are the most well described pathways in carcinogenesis, which has been identified as a key downstream effector in Ras signaling as well as playing important roles in prognosis of tumors. Recently, evidence has gradually accumulated to demonstrate that mutation in Ras or aberrant expression of MAPK has profound effects on the incidence of esophageal carcinoma, and applications of some chemotherapeutic drugs can not lead to the expectant function. Further understanding of the relevant molecular mechanisms of Ras-MAPK signaling pathways will be helpful for development of efficient targeting therapeutic approaches to the treatment of esophageal cancer. In this article, the advances of Ras-MAPK signaling pathways in esophageal carcinoma are reviewed.     

微管不稳定蛋白在消化系肿瘤中的表达及意义

 由于微管不稳定蛋白特有的微管解聚活性,在细胞的增殖、分化及肿瘤的发生中起着重要的作用。近年来,微管不稳定蛋白在消化系肿瘤中的异常表达吸引了很多的关注。研究发现,微管不稳定蛋白的高表达与消化系肿瘤的分化程度,浸润深度,淋巴结转移或TNM分期等呈正相关。     

乳酸链球菌素联合次氯酸钠对粪肠球菌的体外抗菌作用研究

目的    研究乳酸链球菌素（Nisin）联合次氯酸钠（NaClO）对粪肠球菌的体外抗菌作用。方法    采用微量稀释法测定Nisin和NaClO对悬浮态粪肠球菌的最低抑菌浓度（MIC）和最低杀菌浓度（MBC）;通过微量棋盘法计算分级抑制浓度指数（FICI）以判定两药联合效应;用Time-Kill实验来测定Nisin和NaClO单用或联合使用的杀菌动力学。结果    Nisin的MICNisin单药和MBCNisin单药分别为6、15 μg/mL,NaClO的MICNaClO单药和MBCNaClO单药分别为0.0625%、0.25%。两药联合应用时的FICI为0.504,对粪肠球菌的抗菌作用为相加作用。24 h内的Time-Kill曲线表明,在4 × MIC单药时,Nisin和NaClO分别单独应用12、8 h可完全杀灭粪肠球菌;Nisin与NaClO联合应用时2 × MIC单药即可在12 h后出现杀菌作用,从4 × MIC单药开始,在4 h内达到完全杀灭作用。结论    Nisin对粪肠球菌具有抗菌作用,且呈浓度依赖性。在体外将Nisin与NaClO联合应用时,对粪肠球菌的抗菌作用表现为相加作用,较单独应用时可在更短时间内以更低的浓度显示出杀菌作用。