Influence of F protein of hepatitis C virus subtype 1b inhibits on human hepatocellular carcinom HepG2 cell apoptosis / 中华流行病学杂志

Objective To investigate the effects of F protein of hepatitis C virus subtype lb on the apoptosis of human hepatocellular carcinom HepG2 cells. Methods HepG2 cells were transfected with recombinant plasmid pcDNA3.0-F-EGFP and pcDNA3.0-F-EGFP-HepG2 strain was exposed to Act-D and tumor necrosis factor a (TNFα) treatment in order to induce cell apoptosis with positive control pcDNA3.0-C-EGFP-HepG2, negative control pcDNA3.0-C-EGFP-HepG2 and blank control HepG2.Annexin V-FITC/PI of flow cytometry was performed to determine the number of apoptotic cells. DNA Ladder was used to observe the isolation of apoptotic DNA fragments in the apoptotie cells. Results pcDNA3.0-F-EGFP- HepG2 cell strain showed a much delayed apoptosis as well as obviously lowering the apoptotic rate when compared with the pcDNA3.0-HepG2 strain and HepG2 strain (P<0.001).Conclusion The introduction and expression of extraneous gene (the F gene of hepatitis C virus subtype 1b) could significantly inhibit the apoptosis of HepG2 cells.

Molecular epidemiological study on the host and role of the Hantavirus and Orientia tsutsugamushi in the same epidemic area / 中华预防医学杂志

<p><b>OBJECTIVE</b>To investigate whether Hantavirus (HV) and Orientia tsutsugamushi ( OT) can naturally infect and coexist in their host and role.</p><p><b>METHODS</b>By field epidemiological study, Leptotrombidium scutellare (3829) was collected and separated from mice(166) in epidemic areas. The cells of mites separated from their host and role were cultured. PCR was used to detect HV-RNA and OT-DNA in the cell culture.</p><p><b>RESULTS</b>In 105 Apodemus agrarius, 3 HV-RNA positive, 2 OT-DNA positive and 2 coinfection with HV and OT were detected;in 41 Brown rattus, 2 HV-RNA positive, 1 OT-DNA positive and 1 co-infection with HV and OT were detected. From 15 mites co-infected with HV and OT, 2 strains of HV pathogen, 2 strains of OT pathogen were separated and 1 HV and OT pathogen in the same mite were separate.</p><p><b>CONCLUSION</b>The study demonstrates that co-infection of HV and OT did simultaneously exist in wild Leptotrombidium scutellare. This theory has some significance to the epidemic and precaution of HV and OT.</p>

Detection of serum anti-F antibody in hepatitis C virus infected patients / 中华流行病学杂志

<p><b>OBJECTIVE</b>To assess the prevalence of serum anti-F in patients with hepatitis C virus (HCV) infection and the distribution of anti-F.</p><p><b>METHODS</b>The recombinant protein (HCV-F/GST) was coated onto micro titer plates as antigen. Sera of 120 patients with hepatitis C virus infection, 15 patients with hepatitis B, 3 patients with hepatitis E and 10 normal sera were tested by indirect ELISA for detecting anti-F.</p><p><b>RESULTS</b>82 samples out of the 120 (68%) HCV infected patients exhibited a positive anti-F reaction, showing significant difference from the controls with no HCV infection (P < 0.01). Data from logistic analysis showed that the positive rate of anti-F was higher in patients over 50 year olds (OR = 6.675, 95% CI: 2.407-19.071). Patients of midrange, severe phase and hepatic cirrhosis had higher rate than the others (OR = 2.749, 95% CI: 1.470-5.141).</p><p><b>CONCLUSION</b>Prevalence and distribution of anti-F in Yixing hepatitis C patients was reported and which might be related to the progression of HCV infection.</p>

Detection the coinfection of Hantavirus and Orientia tsutsugamushi in primary cultured mite cells / 中华实验和临床病毒学杂志

<p><b>OBJECTIVE</b>To investigate whether HV and Ot can coexist in their host (Leptotrombidium scutellare).</p><p><b>METHODS</b>Collecting the separate Leptotrombidium scutellare and the ones from mice in epidemic area. The cells of mites at larva, nymph, and adult stages were cultured and made into smear. In situ RT-PCR and PCR were used to detect and locate HV RNA and Ot DNA in the primary cultured cells.</p><p><b>RESULTS</b>Positive signals of HV RNA and Ot DNA distributed mostly in epithelial cells of digestive system and ovary cells of larva and nymph. The positive rate increased by the generation of passages.</p><p><b>CONCLUSION</b>Coinfection of HV and Ot did exist in wild Leptotrombidium scutellare.</p>