A method for transforming human liver epithelial cells by transfection using a plasmid containing SV40 early region gene

Summary A method is described for establishing continuous cell lines of liver epithelial cells by transformation of cultured hepatocytes isolated by collagenase/dispase of adult human liver tissue. Between 2 to 5×10⁵ hepatocytes are inoculated into a 60 mm culture dish. The cells are incubated in a serum-free medium. Once the cells begin to divide, they are transformed by transfection with a plasmid containing SV40 early region genes.     

Simian virus 40 large T antigen isoelectric focuses as multiple species with varying phosphate content.

Simian Virus 40 large T antigen (TAg), radiolabeled with [³2P]orthophosphate and with/without [³H]methionine, was found to isoelectric focus as four distinct species distributed in a highly reproducible pattern. These species have been found to differ in their ${}^{32}\text{P}{}^3\text{H}$ ratios indicating that individual monomers of large TAg are heterogeneous in their phosphate content and suggesting, further, that large TAg may be differentially phosphorylated in vivo. Also, by increasing the concentration of large TAg the more basic species can be displaced into the more acidic species suggesting that the different isoelectric focusing forms represent aggregates of large TAg with varying phosphate content.     

BKV and SV40 infection of human kidney tubular epithelial cells in vitro

The interaction of BKV with its natural target cells, human kidney epithelial cells, has not been studied. In vitro infections of human primary kidney epithelial cells were performed to investigate a BKV infection in its natural host cell. BKV undergoes a lytic replication cycle in this system: high levels of T antigen expression were first detected at 36 h postinfection, while viral DNA replication, capsid protein expression, and progeny virus were observed at 48 h postinfection. It was observed that the related polyomavirus SV40 is incapable of infecting human kidney epithelium except in the presence of the GM1 ganglioside, recently reported to be an SV40 receptor.     

Bilateral sympathectomy improves postinfarction left ventricular remodeling and function

Objectives

To evaluate the influence of bilateral or left sympathectomy on left ventricular remodeling and function after myocardial infarction in rats.

Rifamycin SV MMX for the treatment of traveler’s diarrhea

Introduction: Rifamycin SV MMX®, a non-absorbable rifamycin antibiotic formulated using the multi-matrix system, was designed to exhibit its pharmacological action on the distal small intestine and colon. Its clinical efficacy and safety profile in the treatment of traveler’s diarrhea were evaluated in several clinical studies.

Areas covered: This review summarizes all available evidence regarding clinical trials of the efficacy and safety profile of rifamycin SV MMX for the treatment of traveler’s diarrhea.

Expert opinion: Rifamycin SV MMX demonstrated an excellent pharmacokinetic profile with decreased systemic toxicity similar to rifaximin. In phase II and phase III clinical trials, concerns have been raised regarding the medicine’s efficacy in terms of the time to last unformed stool and cure rate compared to current recommended antibiotics in the treatment of acute diarrhea caused by diarrheagenic Escherichia coli and invasive pathogens. The significance of the increase in MICs after the use of rifamycin SV MMX warrants further examination.     

Tet-on诱导表达c-myc和SV40Tag的转基因小鼠肿瘤模型

目的 研究Tet-on诱导表达c-myc和SV40Tag小鼠肿瘤模型的肿瘤发生和基因表达情况,探讨c-myc基因的作用.方法 用pTRE2-c-myc单阳性转基因小鼠和Tet-on、pTRE2-SV40Tag双阳性转基因小鼠交配,后代检测得到Tet-on、pTRE2-SV40Tag、pTRE2-c-myc三阳性转基因小鼠,经强力霉素诱导一段时间以后,观察肿瘤的发生;通过RT-PCR、病理组织切片和磁共振等方法对肿瘤的发生部位和时相进行研究.结果 Tet-on、pTRE2-SV40Tag、pTRE2-c-myc三阳性转基因小鼠①经诱导后发生肿瘤,且发瘤率和发瘤时间高于和短于Tel-on、pTRE2-SV40Tag双阳性转基因小鼠;②c-myc和SV40Tag基因在表达部位上有所不同.结论 c-myc和SV40Tag基因同时表达与SV40Tag基因单独表达时相比,肿瘤发生明显增强,提示c-myc基因与肿瘤的发生有着密切关系.     

阿奇霉素联合利福霉素钠小剂量地塞米松对大叶肺炎患者血浆凝血酶调节蛋白和D-二聚体及降钙素原影响研究

目的:探讨阿奇霉素联合利福霉素钠、小剂量地塞米松对大叶肺炎患者血浆凝血酶调节蛋白和D-二聚体及降钙素原的影响. 方法:选取我院收治的大叶肺炎患者137例,根据治疗方法的不同,分为两组,实验组予阿奇霉素、利福霉素钠、小剂量地塞米松治疗. 对照组予阿奇霉素治疗,7d为1个疗程,治疗1个疗程. 治疗后,观察并比较两组患者的临床疗效,咳嗽、呼吸不畅、啰音等症状,以及血浆凝血酶调节蛋白、D-二聚体、降钙素原的变化. 结果:与对照组相比较,实验组的临床疗效明显改善( P<0.05) ,临床症状缓解显著( P<0.05) ,血浆凝血酶调节蛋白、D-二聚体、降钙素原显著降低( P<0.05) ,差异均有统计学意义. 结论:阿奇霉素联合利福霉素钠、小剂量地塞米松能够降低大叶肺炎患者血浆凝血酶调节蛋白、D-二聚体及降钙素原的水平,改善临床症状,疗效可靠,值得临床推广使用.     

miR‐410 suppresses the expression of interleukin‐6 as well as renal fibrosis in the pathogenesis of lupus nephritis

Lupus nephritis (LN) is a highly complex autoimmune disease caused by systemic lupus erythematosus (SLE). MicroRNAs (miRNAs) play a vital role in the pathogenesis of SLE. Previously, a total of 29 miRNAs were identified to be down‐regulated in SLE patients, in which miR‐410 was likely to be involved in the signalling transduction pathways in regulating the pathogenesis of SLE. The purpose of this study was to investigate the role of miR‐410 in LN and to find out whether miR‐410 regulates the expression of interleukin (IL)‐6 and fibrosis in LN. It was found that the expression level of miR‐410 in kidney tissue of MRL/lpr mice was decreased compared to that in BALB/C mice, whereas the level of IL‐6 was overexpressed in MRL/lpr mice. Luciferase assay showed that miR‐410 binds directly to the 3′ untranslated region (UTR) of IL‐6, with the results showing that overexpression of miR‐410 significantly decreased the expression level of IL‐6 in SV40MES13 cells. Moreover, overexpression of miR‐410 significantly reduced the expression levels of fibrosis factors such as transforming growth factor‐β1 (TGF‐β1) and collagen I/III in SV40MES13 cells; Inhibition of the expression of miR‐410 with miR‐410 inhibitor resulted in increased levels of IL‐6 as well as fibrosis factors. The results identify that miR‐410, as a novel and critical factor in the pathogenesis of LN, decreases IL‐6 expression by binding directly to the 3′UTR and suppresses fibrosis through down‐regulation of TGF‐β1 in SV40MES13 cells. Our study brings new insight into understanding the complex mechanisms involved in the pathogenesis of lupus disease.     

HBVM阳性肺结核病人用利福喷丁或利福平治疗肝功能损害观察

目的 观察利福喷丁?利福平对HBVM 阳性肺结核病人肝功能的影响?方法 对HBVM 阳性和阴性肺结核病人分别用利福喷丁和利福平治疗,观察治疗前后肝功能损害情况?结果 利福平组较利福喷丁组出现肝损害多( P< 0-01) ;HBVM 阳性较阴性病人易出现肝损害( P< 0-01) ;利福平组HBVM 阳性较阴性病人出现肝损害多( P< 0-01) ;利福喷丁组HBVM 阳性和阴性肝损害发生率无显著差异( P> 0-05) ?结论 抗结核治疗时HBVM 阳性比阴性病人更易发生肝损害,与其用药前即存在肝病理损害有关,治疗肺结核用利福喷丁比利福平疗效好且安全?