OBJECTIVE: To investigate the effect of Losartan and Amlodipine on serum and urine transforming growth factor -β_1 in patients undergoing kidney transplantation. METHODS: A total of 40 patients with mild or moderate hypertension (systolic pressure 140-170 mm Hg, and diastolic pressure 85-100 mm Hg, 1 mm Hg=0.133 kPa) following primary kidney transplantation were selected from First People's Hospital of Foshan, including 23 males and 17 females aged (38.6±19.2) years. They were randomly divided into two groups (n=20): Losartan group (oral administration 50 mg per day) and Amlodipine group (oral administration 5 mg per day). The blood pressure of patients should be controlled below 130/80 mm Hg. The blood pressure, renal function, 24 h-proteinuria, serum and urine transforming growth factor-β_1 6 months after medication were observed. RESULTS: A total of 40 patients were included in the final analysis. The systolic pressure and diastolic pressure of patients were decreased after administration (P < 0.05) and decreased to normal levels 6 months after administration (P < 0.01). During treatment, there were significant differences in blood pressure decrease and mean arterial pressure between two groups (P > 0.05). No difference was found in total efficacy between two groups (P > 0.05). In addition, blood urea nitrogen, creatinine, and blood uric acid did not significantly alter after treatment in two groups (P > 0.05). After 6 months of treatment, 24 h-proteinuria, serum and urine transforming growth factor -β_1 in Losartan group were significantly decreased compared with before treatment (P < 0.05), while no obvious changes were found in Amlodipine group (P > 0.05). The 24 h-proteinuria, serum and urine transforming growth factor-β_1 in Iosartan group were significantly less than Amlodipine group (P < 0.05).CONCLUSION: Both Losartan and Amlodipine effectively controlled hypertension of patients following kidney transplantation, but Losartan significantly decreased 24 h-proteinuria, serum and urine transforming growth factor-β_1 compared with Amlodipine.

Objective To investigate the natural infection of Theiler's murine encephalomyelitis virus (TMEV) in mice,and to survey the distribution of virus in tissues and the changes of serum antibody in the experimentally TMEV-infected mice.Methods Enzyme linked immunosorbent assay (ELISA) and fluorescence quantitative RT-PCR (qRT-PCR) assay were used to detect the antibody and nucleic acid of TMEV in clinical samples.These samples included SPF mice collected from Guangdong area in 2010-2015,mice obtained from a non-barrier laboratory rodent colony,and wild Rattus norvegicus live-trapped around the non-barrier laboratory rodent colony.36 ICR mice were intracerebrally inoculated with TMEV BeAn strain.The clinical signs of the animals were observed daily post-inoculation.Three mice were euthanatized at day 0,3,7,10,17,21,31,39 and 46 post-inoculation (dpi),respectively.Tissue and serum samples were collected for TMEV detection.Results The TMEV antibody and nucleic acid positive rates of SPF mice collected from Guangdong area in 2010-2015 were 5.29％ (n=2834) and 27.27％ (n=457),respectively.The TMEV antibody and nucleic acid positive rates of the mice obtained from a non-barrier laboratory rodent colony were 71.95％ (n=82) and 53.66％ (n=82),respectively.The TMEV nucleic acid positive rate of wild Rattus norvegicus was 25.93％ (n=27).In the TMEV positive mice,only two mice showed obvious clinical symptoms.The cecal contents,feces and brain samples were the best candidates for qRT-PCR assay.The viral nucleic acid could be detected in the brain,heart,liver,lung and stomach of ICR mice at 3 dpi,but no viral nucleic acid was detected in the spleen,kidney,and cecum.The viruses in liver,heart,lungs and stomach were completely cleared at 10 dpi,and the viruses persisted in the brain throughout the experiment.The TMEV antibody could be detected at 7 dpi,and then the antibody positive rate reached 100％ at 17 dpi.The antibody level increased gradually and maintained up to 46 days.ICR mice showed latent infection after TMEV inoculation,with no obvious symptoms and eye pathological changes.Conclusions The experimental mice and wild Rattus norvegicus in Guangdong area are both infected with TMEV,and the infection rate is high.The mice inoculated with TMEV BeAn strain show latent infection.The TMEV antibody produced in mice can be detected at 7 dpi and persisted until the end of the experiment.The viruses are found in the liver,heart,lung and stomach for a short time,but are persisted in the brain for a long time.There is a good consistency of TMEV detection between qRT-PCR and ELISA.The qRT-PCR assay can be used as a powerful complement method for the national standard of laboratory animals.

Objective To establish a rapid,specific and sensitive TaqMan real-time fluorescence quantitative PCR assay for detection of murine polyomavirus ( MPyV) .Methods The specific primers and TaqMan probe were designed based on genome sequence of MPyV.The primers amplified a 69 bp fragment.After optimizing the reaction system and reaction condition, the standard curve was plotted by detecting recombinant plasmid standards.The specificity, sensitivity and reproducibility of this method were evaluated.In addition, samples of lungs, spleens and feces obtained from experimentally infected mice and 86 clinical samples were used to validate the efficacy of this real-time PCR assay.Results The specificity assay showed that this assay could specifically detect MPyV and the sensitivity for MPyV was about 100 copies/well.The coefficients of variation ( CV) of both intra-assay and inter-assay were less than 1.13%.All of the samples from experimentally infected mice were positive for MPyV and 3 out of 86 clinical samples were positive by this TaqMan-PCR detection with a positive rate of 3.5%.Conclusions The real-time fluorescence quantitative TaqMan-PCR assay established in this study has high specificity, sensitivity and stability.It can be used for clinical diagnosis, routine detection and epidemiological investigation of murine polyomavirus infections.

Closed-loop hospital management can effectivly cope with the COVID-19 pandemic. In order to ensure the continuity of treatments for hemodialysis patients under closed-loop management and minimize possible medical and infection risks, Huashan Hospital affiliated to Fudan University and 9 hospitals in Shanghai established a hemodialysis alliance in January 2021.The alliance optimized hemodialysis resources within the region through overall planning by preparing sites, materials and personnel shifts in advance, and establishing management systems and work processes to ensure that patients could be quickly and orderly diverted to other blood dialysis centers for uninterrupted high-quality hemodialysis services, in case that some hemodialysis centers in the alliance under closed-loop management.From November 2021 to April 2022, 317 of 1 459 hemodialysis patients in the alliance were diverted to other centers for treatment, accumulating 1 215 times/cases of treatments without obvious adverse reactions. The practice could provide a reference for medical institutions to quickly establish mutual support mode under major public health events.