Isolation of a peptide that inhibits the posttranslational arginylation of proteins in rat brain

All eukaryotic cells contain enzymes that are able to catalyze the transfer of Arg from tRNA to the N-terminus of naturally short lived or damaged cytosolic proteins. For certain test proteins, it has been shown that the addition of Arg to the N-terminus leads to their degradation via the ubiquitin proteolytic pathway. The mechanisms used by cells for identifying proteins for arginylation and regulating arginylation are not known. The present study reports the isolation of a peptide from rat brain that is able to inhibit the arginylation of proteins in brain extracts. We suggest that this peptide is the physiological regulator of arginylation in rat brain.     

参麦注射液对内皮细胞增殖和迁移的影响

目的：探讨参麦注射液对血管生成的影响。方法：采用MTT法检测参麦注射液对牛血清和肿瘤细胞条件培养液促进的牛主动脉内皮细胞增殖的影响，采用琼脂糖刮除法检测参麦对牛血清和肿瘤条件培养液促进的牛内皮细胞迁移的影响。结果：在含10％新生小牛血清培养液中和在肿瘤细胞条件培养液中，参麦都能明显抑制牛主动脉内皮细胞增殖，且呈量效关系，对肿瘤细胞条件培养液诱导的内皮细胞迁移抑制作用显著。方法：参麦能抑制牛内细胞增殖和迁移，具有抑制血管生成的作用。     

姜黄素具有抑制血管生成与诱导肿瘤细胞凋亡双重作用

目的　探讨姜黄素的抗肿瘤机制。方法　采用鸡胚绒毛尿囊膜模型观察姜黄素对血管生成的影响 ;利用培养的肿瘤细胞SMMC 772 1,采用电子显微镜及流式细胞仪观察姜黄素诱导SMMC 772 1细胞凋亡的作用。结果　姜黄素能明显抑制鸡胚绒毛尿囊膜内的血管生成 ,2 0 μmol·L-1的姜黄素即可诱导SMMC 772 1细胞凋亡。结论　姜黄素的抗肿瘤机制是多方面的 ,既可抑制血管生成又可诱导肿瘤细胞凋亡     

血清白细胞介素2检测在恶性腹水白细胞介素2治疗中的应用

目的 对恶性腹水患者血清白细胞介素2(IL-2)水平进行测定,了解血清IL-2水平与腹腔灌注IL-2治疗疗效之间的关系,以期获得判定恶性腹水IL-2治疗疗效的指标。方法 54例恶性非肝癌性腹水患者均接受IL-2腹腔灌注治疗,治疗前应用ELISA法检测血清IL-2水平,将IL-2测定值较高的27例患者分为A组,IL-2测定值较低的27例患者分为B组。比较两组患者的治疗效果。结果 血清IL-2测定值较低组IL-2腹腔灌注治疗的有效率为77.8％(21/27),明显高于IL-2测定值较高组的51.9％(14/27,P<0.05)。结论 恶性腹水患者IL-2腹腔灌注治疗前血清IL-2水平高低与IL-2治疗的疗效明显相关,原有IL-2水平较低的患者IL-2腹腔灌注治疗的疗效较好。血清IL-2水平可作为判定IL-2腹腔灌注治疗疗效的指标。     

人膀胱癌细胞nm23蛋白表达量与丝裂霉素抗药指数之间的相关性研究

目的探讨膀胱癌细胞nm23蛋白表达量与丝裂霉素药物敏感性之间的相关性.为临床膀胱移行细胞癌治疗方案选择提供理论依据.方法对32例临床病理诊断为膀胱移行细胞癌标本采用S-P免疫组化和图像分析技术检测细胞的nm23蛋白表达量;同时采用MTT法测定膀胱癌细胞对丝裂霉素的药物敏感性.结果膀胱癌nm23表达量与MMC抗药指数相关,相关指数为0.890(P＜0.001).结论膀胱癌nm23蛋白表达量与MMC抗药指数呈正相关.     

睾丸扭转诊治及探讨

目的:提高睾丸扭转的诊治水平,减少其误诊率。方法:对临床19例疑诊睾丸扭转病例进行总结,并针对病例分析。结果:2例经镇静治疗后自行复住。17例手术探查,15例证实为睾丸扭转,2例为急性附睾炎。15例睾丸扭转病人中10例为鞘膜外扭转,5例为鞘膜内扭转,发病至就诊时间2h～10d,彩色多普勒超声确诊率88.1%。19例均有睾丸绞痛症状,阴囊皮肤红肿.Prehn征阳性者为18例。结论:突发睾丸疼痛,尤其阴囊皮肤红肿者,应及早行彩色多普勒超声检查,疑为睾丸扭转者应尽早手术是避免睾丸坏死的关键。     

甲型H1N1流感病毒基因组序列分析及其特性研究

Objective To analyse the genome of influenza A (H1N1) vires so as to elucidate its molecular characteristics and evolution status. Methods DNA sequences of the influenza viruses were collected from NCBI, and compared with the genomes of referenced intluenza viruses. The phylogenetic trees were constructed by the neighbor-joining method, and the pathogenicity, drug susceptibility and vaccine protection were analyzed. Results Phyiogenetic analysis showed that the genes encoding HA, PB2, PBI, PA, NP, and NS protein were most closely related to those influenza A viruses circulating in swine populations in North America. NA and M gene belonged to Eurasia lineages swine influenza vires. The amino acid sequence of the cleavage site between HA1 and HA2 was PARSSR ↓ GLFGAI with the typical characteristics of the low pathogenic influenza virus. Influenza A(H1N1) virus can spread from person-to-person. It is sensitive to oseltamivir and zanamivir but resistant to amantadine and remantadine. The current human seasonal influenzavaccines confered little protection against influenza A/H1N1 because of the great diversity on antigenic domains between A/H1N1 virus and vaccine virus. Conclusions Influenza A(H1N1) virus is a reassortant virus of North America and Eurasia hneages swine influenza virus. It is important to develop a vaccine against the currently circulating virus strain to control the disease spread.     

胸腺肽α1单克隆抗体的制备及其鉴定

目的:研制胸腺肽α1(Tα1)单克隆抗体，为Tα1作用机制的阐明奠定基础。方法:用戊二醛将Tα1和牛血清白蛋白进行交联，以其交联物为抗原，按常规淋巴细胞杂交瘤技术制备单克隆抗体，并采用间接酶联免疫吸附(ELISA)法和Western免疫印迹来鉴定单克隆抗体的特异性。结果:建立了分泌抗Tα1抗体的杂交瘤细胞株，能特异性地与Tα1结合，但与单纯牛血清白蛋白、酵母抽提物和转染Tα1酵母未诱导表达产物无反应。其抗体效价为1：10240，Ig亚类为IgG2b。结论：本研究建立了针对Tα1高效价、高特异性单克隆抗体细胞株。     

快速尿素酶试验与组织学诊断幽门螺杆菌的结果比较

目的:比较胃粘膜活检组织快速尿素酶试验和改良的Giemsa染色诊断幽门螺杆菌(Hp)感染的异同。方法:对413例接受胃镜检查的患者,同时利用快速尿素酶试验和改良的Giemsa染色诊断胃粘膜幽门螺杆菌感染,规定两者均阳性为真阳性,两者均阴性为真阴性,快速尿素酶试验阳性而Giemsa染色阴性为假阳性,快速尿素酶试验阴性而Giemsa染色阳性为假阴性。结果:两者诊断结果一致者有311例(75.3% ) ,其中真阳性225例,真阴性86例,两项检查结果符合率为75.3% ;假阴性54例(13.07% ) ,假阳性48例(11.63% )。结论:快速尿素酶试验检测Hp感染需结合组织学诊断结果综合分析。