RESUMO
Objective To study the hepatocyte cells infected by hepatitis C virus (HCV) positive serum. Methods Human hepatocyte 7701 was incubated with HCV RNA-positive and HCV antibody(Ab) negative sera BP52. Then, the expression of HCV antigen and the presence of HCV-RNA in cell and supernatant were assayed by RT-PCR, sequence analysis, immunofluorescent staining, Western blot, confocal laser microscopy. The ultrastructural changes of infected cells were observed by electro-microscopy. Results Plus-strand RNA and minus-strand RNA were intermittently detected in cell and/or supernatant on day 7-45 after infection. Sequence analysis demonstrated that the positive DNA nucleic acids were identified with HCV 5′-non-coding region(NCR) sequence. HCV core and NS3 protein were expressed in cytoplasm of infected cells. After 2 or 3 weeks, obvious intracellular ultrastructural changes and virus-like particles were observed. Conclusion human hepatocyte 7701 could support replication of HCV in vitro, which could be a useful tool for setting up cell model of HCV infection and studying the mechanism of HCV infection.
RESUMO
Objective To observe the effect of calcitonin on senile osteoporosis. Methods Eighty-six osteoporotic patients diagnosed by double-energy X-ray absorptiometry and manifested clinical symptoms and with spinal bone mineral density (BMD) 2 or more were divided into two groups: 46 patients in the observed group were administered 100 IU calcitonin once a day for three days, and changed to 50IU calcitonin once every other day for one month; repeat the administeration method after one month rest and plus oral calcium carbonate vitamin D 600 mg every day for a period of 6 months; another 40 patients in the control group only took calcium carbonate vitamin D 600 mg every day for 6 months. The BMD of L1-4 and hips was examined before and after treatment. Results Bone pain relieving was more obviously in the observed group than that in the control group. BMD of the lumbar spine in the observed group showed remarkable change after treatment(P