Hepatitis B virus(HBV)-specific cytotoxic T lymphocytes(CTLs) are believed to play a major role in viral clearance and disease pathogenesis during HBV infection.To clarify the differences in host immune responses between self-limited and chronic HBV infections,we constructed three HLA-A*0201/HBV tetramers with immunodominant epitopes of core18-27,polymerase 575-583 and envelope 335-343,and analyzed the HBV-specific CTLs in peripheral blood mononu-clear cells(PBMCs) from patients infected with HBV.The frequencies and expansion ability of HBV-specific CD8+ T cells in most self-limited HBV infected individuals were higher than those in chronic HBV-infected patients.HBV-specific CD8+ T cells could be induced by in vitro peptide stimulation from chronic patients with a low level of serum HBV-DNA but not from those with a high level of serum HBV-DNA.In chronic infection,no significant correlation was found either between the frequencies of HBV-specific CD8+ T cells and the viral load,or between the frequencies and the levels of alanine transaminase.Our results suggested that the frequencies of HBV-specific CTLs are not the main determinant of immune-mediated protection in chronic HBV infection and immuno-therapeutic approaches should be aimed at not only boosting a HBV-specific CD8+ T response but also improving its function.
The aim of this study is to investigate the important regulative elements region which plays an important role on the activation of transcription exerted by the 5' noncoding region of hfgl2 gene in response to HBc and HBx. A series of promoter luciferase report plasmids, in which the hfgl2 gene has been deleted of the 5' and retained the common 3', were constructed. All the plasmids constructed were subjected to electrophoretic analysis and DNA sequencing. A eukaryotic construct expressing HBc or HBx, a luciferase reporter construct containing hfgl2 promoter and aβ-galactosidase (β-gal) plasmid were co-transfected into Chinese hamster ovary (CHO) cells and hepG2 cells, respectively. Luciferase report plasmids containing hfgl2 promoter were successfully constructed, and a serial assays of deletion of hfgl2 gene promoter showed that a strong regulatory region from -817 to -467 (relative to the transcription start site) was responsible for transcription and expression regulation of hfgl2 gene. The important regulative elements region in the promoter of hfgl2 gene was in response to HBc and HBx. which contributes to further pursuit of cis-acting elements and transcriptional factors involved in the transcription of hfgl2 gene.
MEI FANG RANYAO YONG ZHOUDONG XIWEI MING YANXIAO PING LUOQIN SING
Gold(Au) nanoparticle HBV DNA or HCV cDNA gene probes were prepared and were used to detect HBV DNA and HCV RNA extracted from positive serum of patients with HBV and HCV coinfection directly by transmission electron microscopy(TEM).PCR identifying HBV and HCV in serum of patients with HBV and HCV coinfection was established.Alkanethiol-modified oligonucleotide was bound with self-made Au nanoparticles to form nanoparticle HBV DNA or HCV cDNA gene probes through covalent binding of Au-S.HBV DNA and HCV RNA extracted from positive serum of patients with HBV and HCV coinfection was added to the detection system composed of nanoparticle HBV DNA and(or) HCV cDNA gene probes.The results showed that HBV DNA and HCV RNA could be specifically amplified by PCR.The zones of DNA amplification appeared in 431 bp and 323 bp respectively.When HBV DNA and HCV RNA extracted from positive serum of patients with HBV and HCV coinfection were added to the detection system,TEM displayed the nanoparticles self-assembled into large network aggregates.It was concluded that the detection of HBV and HCV coinfection by TEM was convenient and efficient with high specificity and sensitivity.
Long-term compliance with regular surveillance is important for the prevention and timely management of chronic hepatitis B (CHB). However, there are no researches focusing on the compliance of hepatitis B virus infected patients in regular surveillance so far. The purpose of our study was to investigate the outpatient compliance with long-term regular surveillance in China. Data of 3257 CHB outpatients was pooled and analyzed to assess the outpatient's compliance with the long-term regular surveillance plan. In all outpatients, the non-follow-up and the follow-up group accounted for 73.2% and 26.8%, respectively. Among the follow-up outpatient's, only 48.9% received ongoing-follow-up and 51.1% were finally lost to follow-up; the median length of visiting duration was 25 months; and the predictive 1-, 2-, 3-, 4and 5-year ongoing follow-up rate was 72.7%, 52.5%, 42.4%, 33.8%, and 26.3%, respectively. In conclusion, our survey proved that the regular long-term surveillance on Chinese chronic HBV carrier is difficult to be fully implemented. A large proportion of outpatients do not receive routine follow-up and are at risk of treatment delay due to various social reasons.
AIM: To examine the role of Fibrinogen-like protein 2 (fgl2)/fibroleukin in tumor development. Fgl2 has been reported to play a vital role in the pathogenesis in MHV-3 (mouse hepatitis virus) induced fulminant and severe hepatitis,spontaneous abortion,allo-and xeno-graft rejection by mediating "immune coagulation". METHODS: Tumor tissues from 133 patients with six types of distinct cancers and the animal tumor tissues from human hepatocellular carcinoma (HCC) model on nude mice (established from high metastasis HCC cell line MHCC97LM6) were obtained. RESULTS: Hfgl2 was detected in tumor tissues from 127 out of 133 patients as well as tumor tissues collected from human HCC nude mice. Hfgl2 was highly expressed both in cancer cells and interstitial inflammatory cells including macrophages,NK cells,and CD8+ T lymphocytes and vascular endothelial cells. Hfgl2 mRNA was localized in cells that expressed hfgl2 protein. Fibrin (nogen) co-localization with hfgl2 expression was determined by dual immunohistochemical staining. In vitro,IL-2 and IFN-γ increased hfgl2 mRNA by 10-100 folds and protein expression in both THP-1 and HUVEC cell lines. One-stage clotting assays demonstrated that THP-1 and HUVEC cells expressing hfgl2 had increased procoagulant activity following cytokines stimulation. CONCLUSION: The hfg12 contributes to the hypercoagulability in cancer and may induce tumor angiogenesis and metastasis via cytokine induction.
Kai Su Fang Chen Wei-Ming Yan Qi-Li Zeng Li Xu Dong Xi Bin Pi Xiao-Ping Luo Qin Ning
