Effect of mitochondrial ATP sensitive potassium channels opening on translocation of protein kinase C epsilon in cultured adult rat ventricular myocytes

AIM: To investigate the effects of mitochondrial ATP sensitive potassium (MitoKATP) channel opening on translocation of protein kinase C epsilon (PKCε) and the relationship between the translocation of PKCε and the production of reactive oxygen species. METHODS: The expression of PKCε in cultured adult rat ventricular myocytes was investigated with immunofluorescence and Western blotting techniques. RESULTS: （1） Diazoxide, a selective MitoKATP channel opener, caused a significant translocation to myofibrillar-like structures in cultured adult rat ventricular myocytes. (2) The N-2-mercaptopropionylglycine (MPG), a free radical scavenger, partly inhibited the translocation of PKCε caused by diazoxide. (3) Chelerythrine, a selective protein kinase C (PKC) inhibitor, completely blocked the translocation of PKCε caused by diazoxide. CONCLUSION: Opening of MitoKATP channel might activate PKCε and make it translocation to myofibrillar-like structures. PKCε activation occurs downstream of MitoKATP channel, and might be caused by production of reactive oxygen species after opening of MitoKATP channel.     

贵州烟仓害虫天敌种类及优势天敌初步研究

贵州烟仓害虫天敌种类多,优势、有效天敌为麦蛾茧蜂(Habrobracon hebetor)、米象娜金小蜂(Lariophagusdistinguendus)。天敌对降低和减轻害虫的发生量及控制其对烟叶的危害发挥了重要作用。在烟叶储藏中开展生物防治,保护利用天敌有着广泛的前景。     

大豆锈病研究现状与进展

大豆锈病近年在东南亚、南美洲发展迅速,对大豆生产威胁越来越大,尤其2004年11月登陆美国大陆,更引起大豆研究者、大豆生产国和进口国的极大关注。本文介绍了近年国际上大豆锈病的研究进展,主要包括大豆锈病的发现、地理分布、病原、症状、寄主范围、病原菌生理分化和防治技术研究等。     

Comparative phosphoproteome analysis of cardiomyocytes preconditioned by diazoxide

AIM: To analyze and identify the phosphoproteins associated with diazoxide preconditioning. METHODS: Proteomics technique was used to investigate the changes of phosphoprotein after diazoxide preconditioning. Adult rat ventricular myocytes were pretreated in the presence and absence of 200 μmol/L diazoxide for 10 min. Phosphoproteins prepared and enriched respectively from control and diazoxide pretreated groups were then separated by two-dimensional (2D) gel electrophoresis and stained with sliver staining kit. Phosphoproteins of interest were further identified by mass spectrometry. RESULTS: Associated with diazoxide preconditioning, the proteins of chaperonin containing TCP-1 and hypothetical protein XP_346548 were phosphorylated significantly. The proteins of 94 kD glucose-regulated protein, calpactin I heavy chain and ferritin were dephosphorylated markedly (P<0.05). CONCLUSION: These findings suggest that cardiomyocytes undergo significant posttranslational modification via phosphorylation in a multitude of proteins in response to diazoxide preconditioned signaling, which may mediate myocardioprotection signaling downstream mitochondrial staining dish K_ATP channel induced by ischemic preconditioning.     

基因芯片在百合无症病毒检测中的应用

设计百合无症病毒、植物18SrRNA基因的特异扩增引物和各种对照的探针，将探针固定在醛基化玻璃片基上，完成植物基因芯片制备。提取百合种球总RNA，经RT-PCR扩增相应区段并用Cy3dCTP进行标记，用标记的PCR产物与芯片杂交，扫描仪对杂交结果进行扫描，GenePixProd．0软件对杂交图像进行分析。结果从荷兰进口的百合种球中检测出百合无症病毒，证明了该实验研制的植物病毒基因芯片的准确性和灵敏性。     

蛋鸡锰缺乏症的病理学研究

１日龄父母代罗曼（Ｌｏｈｍａｎｎ）蛋鸡１２０只,随机分为３组,分别喂以低锰（基础日粮含锰１３．６２ｍｇ／ｋｇ）、低锰高磷（基础日粮＋０．５％的磷）、补锰对照（基础日粮＋锰８０ｍｇ／ｋｇ）日粮。试验期８周。饲喂５～８周发病。低锰组发病率２６％,低锰高磷组２８％,补锰对照组无一发病。第４周时,体重分别为（２６７．９±８．３２）、（２１４．２±１０．４２）、（２６５．０±１２．１８）ｇ,低锰组、补锰对照组与低锰高磷组之间差异极显著（Ｐ＜０．０１）。肝锰含量分别为（５．４０±０．７４）、（２．８２±０．３６）、（８．４８±０．９６）ｍｇ／ｋｇ,补锰对照组与低锰组差异显著（Ｐ＜０．０５）,与低锰高磷组差异极显著（Ｐ＜０．０１）。发病症状：精神沉郁,不愿走动,伏卧,跛行,单腿发病病腿向外侧伸展,双腿发病则内收呈“Ｏ”字形或外展呈“八”字形。剖检跗关节肿大,胫骨髁骨骨质增生、肿大,髁间沟变平坦。组织学检查,胫骨骺生长板增殖区变窄,软骨基质中粘多糖减少。超微结构变化,心肌纤维、肝细胞、胫骨骺生长板软骨细胞、睾丸精原细胞等线粒体肿胀与空泡化。     

甲鱼暴发性传染病的病原分离及治疗试验

从１５例表现为“红底板”、“红脖子”、“烂甲”的患病甲鱼肝脏分离到９株无荚膜、无芽胞、革兰氏阴性、β溶血的短杆菌,经理化特性鉴定均为气单胞菌属（Ａｅｒｏｍｏｎａｓ）嗜温有动力菌群,其中温和气单胞菌（Ａ．ｓｏｂｒｉａ）７株,豚鼠气单胞菌（Ａ．ｃａｖｉａｅ）２株。从Ａ．ｓｏｂｒｉａ和Ａ．ｃａｖｉａｅ各选一代表菌株（ＪＡ－１和ＪＡ－２）分别感染健康鲫鱼均引起发病和死亡,其ＬＤ５０分别为４．３×１０５、５．５×１０７,并回收到该２种菌。在该２种菌培养上清中存在１种具有溶血活性的毒素。以ＪＡ－１和ＪＡ－２为菌种制成混合菌苗,在应用由黄芪、有机锗制成的免疫增效剂后,再用混合菌苗免疫家兔,制得的多价高免血清（效价达１∶５１２）与庆大霉素、恩诺沙星进行了治疗对比试验。结果,高免血清治疗自然病甲鱼１０９只,全部治愈;庆大霉素、恩诺沙星分别治疗自然病甲鱼７２只和８４只,平均治愈率分别为８８％和８４％。