Guo-Feng Chen

302 Military Hospital of China, Peping, Beijing, China

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Publications (9)8.21 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To investigate reliability of FibroScan (FS) in diagnosing size of oesophageal varices (OV) in patients with liver cirrhosis.
    08/2014; 22(8):600-603.
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    ABSTRACT: To study ability of FibroScan (FS) in diagnosing the size of oesophageal varices (OV) in patients with HBV-related cirrhosis. A total of 158 patients with HBV-related liver cirrhosis were enrolled in the study. The relation between the presence of OV assessed by endoscopy, and liver stiffness measurement by Fibroscan was studied, and ROC curves were drawn to assess the diagnostic ability of FS value. For the patients without OV, mild OV, moderate OV, and severe OV, their corresponding FS values were (21.7 +/- 9.9) kPa, (32.1 +/- 13.6) kPa, (42.3 +/- 20.0) kPa and (54.5 +/- 16.2) kPa, respectively. Significant difference was found among the groups (P < 0.001) and also between any two groups (P < 0.05). ROC curve for the diagnosis of with vs. without OV, moderate OV, and < severe vs. severe OV were 0.798 (95% CI: 73.1%-86.5%), 0.823 (95% CI: 74.5%-90.0%) and 0.879 (95% CI: 80.8%-95.0%), respectively, with corresponding FS cut-off value of 23.3 kPa, 31.5 kPa and 34.6 kPa. Liver stiffness measurement allows to predict the sizes of oesophageal varices in patients with HBV-related cirrhosis.
    Zhonghua shi yan he lin chuang bing du xue za zhi = Zhonghua shiyan he linchuang bingduxue zazhi = Chinese journal of experimental and clinical virology 12/2012; 26(6):470-3.
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    ABSTRACT: To explore whether the cellular apoptosis susceptibility (CAS) protein could serve as a pathologic marker for HCC diagnosis and the roles of CAS expression in HBV infection associated HCC. The expression of CAS protein in HCC and its paracarcinoma tissues, non-tumor liver cirrhosis and hepatitis tissues were detected by immunohistochemistry. Meanwhile, HBsAg, HBcAg and HBV DNA in HCC tissues with HBV infection were examined by immunohistochemistry and in situ hybridization respectively. The expression of CAS protein was significantly higher in HCC than in its paracarcinomas tissues (P < 0.01), and higher in paracarcinomas tissues than in non-tumor liver cirrhosis and hepatitis tissues (P < 0.01). Poorly differentiated tumors immunochemically stained stronger than moderately or well differentiated (P < 0.01). CAS protein expression was significantly higher in HBV-infected HCC tissues than that of in non-HBV infection (P < 0.01). Meanwhile, in HBV-infected HCC tissues, the staining intensity score of CAS protein in HBV DNA positive HCC tissues was significantly higher than HBV DNA negative tissues (P < 0.05). Higher expression of CAS protein is found in HCC tissues,and the intensity of CAS protein expression is related closely to tumor differentiation. We suggested that CAS protein might serve as a marker for HCC diagnosis and differentiation estimation, and deduced that CAS might play an important role in the initiation of HBV infection associated HCC through upregulating expression of CAS.
    Zhonghua shi yan he lin chuang bing du xue za zhi = Zhonghua shiyan he linchuang bingduxue zazhi = Chinese journal of experimental and clinical virology 08/2012; 26(4):285-7.
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    ABSTRACT: It remains unclear whether hepatitis B virus (HBV) reverse-transcriptase (RT) rtL229 substitutions influence HBV drug resistance. The study was to investigate the association of HBV rtL229 substitutions with viral resistance to lamivudine (LAM). Entire HBV RT genes were amplified by nested PCR and sequenced from sera of 6000 nucleos(t)ide analog-experienced patients with chronic HBV infection. The incidence and clinic relevance of rtL229 substitutions were analyzed. Replication-competent viral amplicons which harbored HBV genomes of wild-type, rtM204I, or rtM204I in conjunction with various rtL229 substitutions (rtL229F/W/M/V) were constructed. The amplicons were transfected into HepG2 cells for phenotyping of replication capacity and susceptibility to nucleos(t)ide analogs. The rtL229 substitutions were detected in 6.57% (394/6000) of patients. Individual substitution incidences were 2.77%, 0.97%, 0.83% and 0.55% for rtL229V, rtL229F, rtL229M and rtL229W, respectively. The incidence of rtL229 substitutions was significantly higher in LAM-experienced patients (341/4220, 8.1%) than in LAM-naïve patients (53/1780, 3.0%), and were independently associated with genotypic LAM resistance (77.9% vs. 21.2%, OR 8.806, 95%CI 6.345-12.223) and low viral replication (HBV DNA <1000IU/mL) (4.60% vs. 24.2%, OR 0.478, 95%CI 0.254-0.898). Representative cases follow-up showed that rtL229F developed subsequent to rtM204I emergence during LAM treatment and regressed with rtM204I after LAM withdrawal. Functionally, rtL229F did not confer reduced susceptibility to LAM, but could restore replication capacity of rtM204I strain. The rtL229 substitutions were potentially associated with LAM resistance in Chinese patients and rtL229F had characteristics of a compensatory mutation of rtM204I mutant.
    Journal of clinical virology: the official publication of the Pan American Society for Clinical Virology 03/2012; 54(1):66-72. · 3.12 Impact Factor
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    ABSTRACT: Various mutations in reverse-transcriptase domain (RT) of hepatitis B virus (HBV) polymerase may develop during antiviral therapy. The influence of these mutational patterns on HBV replication capacity remains to be fully clarified. Nine clones containing complete HBV genomes were isolated from 5 patients with chronic hepatitis B who had received antiviral treatment. Viral replication capacity was measured by quantitation of HBV replicative intermediates using vector-free transfer of paired mutant and wild-type HBV genomes into human hepatoma cell lines HepG2 and Huh7. HBV pgRNA was quantitated by real-time PCR and Southern blot analysis. A real-time PCR assay with high sensitivity and small variation was developed for quantitation of HBV replicative intermediates. Compared to wild-type counterpart, mutant rtL217P produced 1.98-fold higher replicative intermediate level, and mutant rtM204I+rtL217P increased the replicative intermediate level to 1.20 fold. Other mutational patterns (rtV173M, rtA181S/V, rtM204I, rtQ215H, rtL229M, rtN238H, rtV84M+rtA181S+rtM204I, rtV84M+rtM204I, rtA181S+rtM204I, rtA181V+rtL229M, rtQ215H+rtN238H) reduced viral replication capacity to different extents. The study offers a practical measurement assay and novel information for replication features of mutant strains; especially, rtL217P substitution likely represents an energetic replication-compensatory mutation.
    Clinica chimica acta; international journal of clinical chemistry 11/2010; 412(3-4):305-13. · 2.54 Impact Factor
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    ABSTRACT: To investigate the down-regulating effect of HBV pre-S2 protein upon insulin receptor (INSR) gene promoter. Eukaryotic expression plasmid pcDNA3.1(-)-preS2 and report plasmid pCAT3-INSRp containing INSR gene promoter upstream of CAT gene were constructed with routine molecular biological methods and were confirmed by endonuclease digestion analysis and sequencing. Then HepG2 cells were transfected with pcDNA3.1(-)-preS2 plasmid and the total RNAs were examined with relative quantitative real-time PCR to confirm the expression of HBV pre-S2 protein. Later HepG2 and Huh7 cells were transfected with pCAT3-INSRp at various doses (0 - 2.0 microg). The choloraphenical acetyltransferase (CAT) activity of transfected cells was detected with CAT-ELISA to generate the dose-effect curve of pCAT3-INSRp. Lastly pCAT3-INSRp (1.0 microg) and pcDNA3.1(-)-preS2 (1.0, 1.5, 2.0, 2.5, 3.0 microg) were co-transfected into HepG2 and Huh7 cells respectively to study the regulation effect of pre-S2 protein upon INSR promoter. Meanwhile pre-S2 monoclonal antibody was added into additional cells transfected with 2.0 microg of pcDNA3.1(-)-preS2 plasmid to evaluate the effect when pre-S2 protein was blocked. The mRNA of pre-S2 protein could be detected with real-time PCR indicating that pre-S2 protein was properly expressed in pcDNA3.1(-)-preS2-transfected cells. The expression of CAT increased proportionally with the incremental doses of pCAT3-INSRp. It suggested that the INSR gene promoter had its transcription activity. After co-transfection of pCAT3-INSRp and pcDNA3.1(-)-preS2, the CAT expression in HepG2 cells, comparing with that of controls, were 69.8%, 60.1%, 19.7%, 10.3%, 5.6% (36 h) and 68.6%, 56.0%, 10.3%, 8.6%, 3.2% (72 h) respectively. When pre-S2 monoclonal antibody was added into the supernatant of HepG2 cells transfected with 2.0 microg of pcDNA3.1(-)-preS2, the CAT expression was partly restored to 55.4%(36 h)and 69.7%(72 h)of controls. The similar results were observed in Huh7 cells. The pre-S2 protein down-regulates the activity of INSR gene promoter so as to reduce the expression of INSR. It may partly elucidate the pathogenesis of hepatogenous diabetes at the molecular level.
    Zhonghua yi xue za zhi 11/2009; 89(43):3069-73.
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    ABSTRACT: To investigate the transactivating effect of pre-S2 protein of hepatitis B virus (HBV) and construct a subtractive cDNA library of genes transactivated by pre-S2 protein with suppression subtractive hybridization (SSH) technique, and to pave the way for elucidating the pathogenesis of HBV infection. pcDNA3.1(-)-pre-S2 containing pre-S2 region of HBV genome was constructed by routine molecular methods. HepG2 cells were cotransfected with pcDNA3.1(-)-pre-S2/pSV-lacZ and empty pcDNA3.1(-)/pSV-lacZ. After 48 h, cells were collected and detected for the expression of beta-galactosidase (beta-gal). SSH and bioinformatics techniques were used, the mRNA of HepG2 cells transfected with pcDNA3.1(-)-pre-S2 and pcDNA3.1(-) empty vector was isolated, respectively, cDNA was synthesized. After digestion with restriction enzyme RsaI, cDNA fragments were obtained. Tester cDNA was then divided into two groups and ligated to the specific adaptor 1 and adaptor 2, respectively. After tester cDNA was hybridized with driver cDNA twice and underwent two times of nested PCR, amplified cDNA fragments were subcloned into pGEM-Teasy vectors to set up the subtractive library. Amplification of the library was carried out with E.coli strain DH5alpha. The cDNA was sequenced and analyzed in GenBank with Blast search after PCR. The pre-S2 mRNA could be detected in HepG2 cells transfected with pcDNA3.1(-)-pre-S2 plasmid. The activity of beta-gal in HepG2 cells transfected with pcDNA3.1(-)-pre-S2/pSV-lacZ was 7.0 times higher than that of control plasmid (P<0.01). The subtractive library of genes transactivated by HBV pre-S2 protein was constructed successfully. The amplified library contains 96 positive clones. Colony PCR showed that 86 clones contained 200-1 000 bp inserts. Sequence analysis was performed in 50 clones randomly, and the full length sequences were obtained with bioinformatics method and searched for homologous DNA sequence from GenBank, altogether 25 coding sequences were obtained, these cDNA sequences might be the target genes transactivated by pre-S2 protein. The pre-S2 protein of HBV has transactivating effect on SV40 early promoter. The obtained sequences may be target genes transactivated by pre-S2 protein among which some genes coding proteins involved in cell cycle regulation, metabolism, immunity, signal transduction and cell apoptosis. This finding brings some new clues for studying the biological functions of pre-S2 protein and further understanding of HBV hepatocarcinogesis.
    World Journal of Gastroenterology 10/2005; 11(35):5438-43. · 2.55 Impact Factor
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    ABSTRACT: To screen and clone the genes of protein interacting with the N-terminal protein (TP) of hepatitis B virus DNA polymerase. TP was amplified by polymerase chain reaction (PCR) and TP bait plasmid was constructed by using yeast two-hybrid system 3, then transformed into yeast AH 109. The transformed yeast was mated with yeast Y187 containing liver cDNA library plasmid in 2 x YPDA medium. Diploid yeast was plated on synthetic dropout medium (SD/-Trp-Leu-His-Ade) and that containing X-alpha-GAL for selecting two times and screening. Plasmids were extracted from blue colonies, and sequence analysis was performed by bioinformatics. Forty-seven clones were obtained, these clones included human P36956 sterol regulatory element binding protein-1, RNA polymerase II subunit hsRPB7 mRNA, asialoglycoprotein receptor 2, transcript variant 3, ceruloplasmin (ferroxidase), transmembrane 4 superfamily member 2 and 19 of the hypothetical proteins and so on. Genes encoding TP interacting proteins in hepatocytes were successfully cloned and the results suggest that TP has a wide variety of biological functions.
    Zhonghua shi yan he lin chuang bing du xue za zhi = Zhonghua shiyan he linchuang bingduxue zazhi = Chinese journal of experimental and clinical virology 04/2005; 19(1):84-6.
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    ABSTRACT: AIM: To elucidate the clinical and pathological characteris- tics of steatohepatitis in the patients with chronic hepatitis C virus (HCV) infection. METHODS: The clinical and pathological data of 159 pa- tients with chronic HCV infection were analyzed retrospec- tively to elucidate the epidemiological rate and the charac- teristics of different pathological types and grades. The pathological typing was clarified as microvesicular, macrovesicular and mixed. The pathological grading was clarified as mild (less than 10%),moderate (less than 30%, but more than 10%) and severe (more than 30%). The significant analysis of multiple factors was conducted by using SAS statistic analysis software. RESULTS: The incidence of steatohepatitis in patients with chronic HCV infection was 82. 39% (131/159). The per- centages of mild,moderate and severe types of steatohepatitis were 29. 46% (33/112),60. 71% (68/112) and 9. 82% (11/112) respectively. The percentages of microvesicular,macrovesicular and mixed types in steatohepatitis were 47. 33% (62/131),3. 82% (5/131) and 48. 85% (64/131),respectively. The types and grades of steatohepatitis in patients with chronic HCV infection were not significantly related with the types of hepatitis viruses, HCV RNA positivity,transfusion history and age,but the gender. Generally,the steatohepatitis in male patients is sig- nificantly severe than that of female patients. CONCLUSION: Eighty-two percent of patients with chronic HCV infection were accompanied with steatihepatitis. The steatohepatitis of male patients was significant severe than that of female patients.

Publication Stats

11 Citations
8.21 Total Impact Points

Institutions

  • 2012
    • 302 Military Hospital of China
      Peping, Beijing, China
    • The 251st Hospital of Chinese PLA
      Chzhantseyakou, Hebei, China
  • 2005
    • 307 Hospital of the Chinese People's Liberation Army
      Peping, Beijing, China