Objective To observe the expressions of matrix metalloproteinase-9 mRNA and the change of cerebral edema after diffuse brain injury in rats and discuss their correlation.Methods Marmaruu's diffuse brain injury model of rat was made.Real-time quantitative RT-PCR,dry-wet meth- od,histological techniques and electron microscope were used to determine the expressions of MMP-9 containing water in brain tissue and inflammatory reaction and uhrastructural changes of blood capillary at different time phases after truama.Results The expressions of MMP-9 mRNA started to increase at 1 hour,peaked at 12 hours(P

Adolescent ; Adult ; Automobile Driving ; China ; Electrocardiography ; Female ; Heart ; physiopathology ; Humans ; Male ; Middle Aged ; Noise, Occupational ; adverse effects ; Occupational Exposure ; adverse effects ; Stress, Psychological ; etiology ; physiopathology ; Vibration ; adverse effects

Strict regulation of HIV-1 PR function is critical for efficient production of mature viral particles. During viral protein expression and viral assembly, HIV-1 PR located within Gag-Pol precursor must be inactive to prevent premature cytoplasmic processing of the viral Gag and Gag-Pol precursors. Premature activation of HIV-1 precursors leads to major defects in viral assembly and production of viral particles. A cell-level premature activation of HIV-1 precursors assay using bioluminescence resonance energy transfer (BRET) was established. Three thousand compounds were screened to evaluate this assay. The results showed that the assay is sensitive, specific and stable (Z' factor is 0.905).

Objective To analyze the practicability of using ELISA kit for the detection of hepati-tis E virus antigen ( HEV-Ag) in plasma donations and Biomex HEV seroconversion panels. Methods The HEV-Ag positive samples were screened out from 36 340 donated blood plasma samples. Real-time fluores-cent PCR was performed for the detection of HEV RNA in HEV-Ag positive samples. The open reading frame 2 (ORF2) in HEV RNA was amplified by nested RT-PCR and the amplified products were confirmed by sequencing analysis. Phylogenetic tree was constructed for HEV genotyping. Five Biomex HEV serocon-version panels were used in this study for the detection of HEV-Ag, anti-HEV antibody and HEV RNA as well as the correlation analysis between HEV-Ag and HEV RNA. Results Twenty-six out of 36 340 plasma samples (0. 07%) were positive for HEV-Ag. Of the 26 samples, 25 samples were positive for HEV RNA as indicated by the results of nested RT-PCR and 23 positive samples were confirmed by sequencing analysis. The positive rate of HEV RNA in blood plasma donators was 1 ∶ 1 580 (0. 06%). There were 17 samples of genotype 1 (74%) and 6 samples of genotype 4 (26%) according to the phylogenetic tree analysis. All of the HEV-Ag positive samples were also positive for HEV RNA as indicated by the analysis of Biomex sero-conversion panels. HEV-Ag was consistent with the peak of the HEV RNA concentration. Conclusion A close relationship between HEV-Ag and HEV RNA was observed. HEV-Ag screening could be used as a measure to reduce the risk of HEV transmission by blood transfusion.

The effect of magnetic Fe3O4 particles on cellulase in the enzymatic hydrolysis of sunflower seed hull was studied in different adding ways and additive amount. In the process of enzymatic hydrolysis of sunflower seed hull, the variations of cellulase activity, reducing sugar concentration and cellulose conversion were evaluated. After the reaction, the analysis of pH and surface tension of hydrolysate were also used to determine the mechanisms of cellulase by the magnetic effect. The results indicated that after adding magnetic Fe3O4, the cellulase activity, reducing sugar concentration and conversion of cellulose had an increased between the 0.5 g/L and 2.0 g/L cases after 48 h. When the additive amount of magnetic Fe3O4 was 2 g/L, the cellulase activity at 60 h was improved significantly by 25.9%. It was found that the concentration of reducing sugar was increased from 6.950 mg/mL to 8.775 mg/mL with magnetic Fe3O4 1.5 g/L. Simultaneously, compared with the blank, which the conversion of cellulose was 47.932%, the maximum celluloseconversion of samples with adding magnetic Fe3O4 was 60.531%. Besides, the stability of cellulase activity adding in times was better than in one time. After the reaction, the final surface tension of hydrolysate with 1.5 g/L magnetic Fe3O4 was the lowest in comparison with the blank. However, no significant differences were observed in the final pH of the hydrolysate.

With the emergence of drug resistant tuberculosis, it is very urgent to find novel anti-tuberculosis drugs, especially novel anti-drug-resistant tuberculosis drugs. Because of the slow growth and the need to work in a biosafty environment of Mycobacterium tuberculosis, the development of evaluation of drug effect is severely impeded. In order to solve these issues, non-pathogenic fast-growing Mycobacterium smegmatis is introduced as test organism. The inhA is one of a target of isoniazid (INH) overexpression or mutation of this gene in Mycobacterium tuberculosis conferring resistant to INH. A recombinant plasmid bearing inhA was constructed and electroporated into Mycobacterium smegmatis, using shuttle expression vector pMV261. Transformants were induced to express a protein of inhA, identified by SDS-PAGE. Results show that Mycobacterium smegmatis containing inhA plasmids exhibited 100-fold or greater increased resistance to INH, but it conferred no increased resistance to others first-line anti-tuberculosis drugs. Resazurin microtiter assay plate testing of Mycobacterium smegmatis susceptibility to drugs is a rapid, simple, and inexpensive method and could decrease color background of drugs by detecting fluorescence. It will be benefit for high-throughout screening of drugs of anti-isoniazid-resistant Mycobacteria.

Liver cirrhosis is the leading cause of liver-related death globally, and the most common causes of liver cirrhosis are chronic hepatitis B and C, alcoholic liver disease, and nonalcoholic fatty liver disease. Recent studies have shown that despite an increase in the number of deaths due to liver cirrhosis around the world, there is a reduction in age-standardized death. In China, there are increases in number of patients with liver cirrhosis, prevalence rate of liver cirrhosis, number of deaths due to liver cirrhosis, and mortality rate of liver cirrhosis, while there are reductions in age-standardized prevalence rate and mortality rate; chronic hepatitis B remains the main cause of liver cirrhosis, with a gradual increase in the proportion of liver cirrhosis cases caused by alcoholic and nonalcoholic fatty liver diseases.

Hepatitis B virus (HBV) infection was highly endemic in China, where the prevalence of HBsAg was 9.7% in 1992. Comprehensive strategies, including universal infant hepatitis B vaccination with emphasis on timely birth-dose and 3-dose coverage, dramatically reduced the mother-to-infant transmission and early childhood acquisition of HBV, resulting in estimated HBsAg prevalence rates of 5.6% and 0.1% in the general population and among children aged <5 years in 2022, respectively. Clinical guidelines on the prevention and treatment of chronic hepatitis B have been periodically updated based on emerging evidence from clinical research. The continuously improved reimbursement policy and the massively reduced price of antiviral drugs through government negotiation and central procurement have increased treatment accessibility and affordability. However, due to the low rates of diagnosis and treatment, China still faces a large challenge in achieving the 2030 goal of lowering HBV-related mortality by 65%. A public health approach involving concerted efforts from the government, medical community, industry, and society as a whole would be necessary to increase the uptake of HBV tests and treatment to achieve the global goal of eliminating viral hepatitis as a public health threat by 2030.

OBJECTIVETo construct an eukaryotic expression vector for vascular endothelial growth factor (VEGF) 165 gene and obtain VEGF expression in rat bladder smooth muscle cells.

METHODSVEGF165 cDNA was cloned into the eukaryotic expression vector pcDNA3.1(-), and the resultant recombinant vector pcDNA3.1(-)/VEGF165 was transfected into the rat bladder smooth muscle cells by electroporation. VEGF expression in the cells was determined by RT-PCR and immunofluoresence assay, and the biological activity of VEGF in the supernant of the transinfected cell culture was tested by MTT assay.

RESULTS AND CONCLUSIONVEGF expression was obtained in the transinfected cells, and the supernant of the transinfected cell cultures stimulated the proliferation of the endothelial cells.

Animals ; Animals, Newborn ; Cell Line ; Cell Proliferation ; drug effects ; Cells, Cultured ; Cloning, Molecular ; Culture Media, Conditioned ; metabolism ; pharmacology ; DNA, Complementary ; genetics ; Eukaryotic Cells ; metabolism ; Fluorescent Antibody Technique ; Gene Expression ; Genetic Vectors ; genetics ; Humans ; Myocytes, Smooth Muscle ; cytology ; metabolism ; Rats ; Reverse Transcriptase Polymerase Chain Reaction ; Transfection ; Urinary Bladder ; cytology ; Vascular Endothelial Growth Factor A ; genetics ; metabolism ; pharmacology

Objective To observe the therapeutic effect of Taoshi Jiangu Decoction for osteoporosis(OP). Methods A total of 120 cases of OP patients were randomly divided into treatment group and control group ,60 cases in each group. Patients in the treatment group were treated with Taoshi Jiangu Decoction orally,and those in the control group were treated with Caltrate D and Alendronate Sodium Tablets orally. Four weeks constituted one treatment course, and the treatment for the two groups covered 3 courses. The therapeutic effect of the two groups was evaluated by the changes of traditional Chinese medicine(TCM)syndrome scores,urine hydroxyproline (U-HYP),serum bone Gla-protein (BGP or osteocalcin),serum alkaline phosphatase (ALP),urine calcium (U-Ca),tartrate resistant acid phosphatase (TRAP), bone mass density(BMD) and quantitative CT(QCT) before and after treatment. Results (1)After treatment, the TCM syndrome scores of the two groups were decreased(P<0.05 compared with those before treatment),and the decrease in the treatment group was superior to that of the control group (P < 0.05). (2)After treatment,the levels of bone formation indexes of ALP and BGP were increased,and the levels of bone resorption indexes of U-HYP,U-Ca and TRAP were decreased in the two groups (P<0.05 compared with those before treatment). The effects of the treatment group were superior to those of the control group,the difference being statistically significant(P < 0.05).(3)After treatment,BMD of lumbar vertebrae 2-4 (L2-L4),neck of femur,Wards triangle and trochanter of femur,and QCT values of left neck of femur were obviously increased in the two groups (P < 0.05 compared with those before treatment). The treatment group showed stronger effect on increasing BMD and QCT values than the control group, the difference being statistically significant (P < 0.05). Conclusion Taoshi Jiangu Decoction can restrain bone absorption , promote bone formation and increase BMD, showing certain therapeutic effect for OP.