Objective With eukaryote expression vector pEGFP-C2, to establish the HepG2 cell line which may stably express the P22e of hepatitis B virus (HBV), and may be used to study the existed relationship between HBVP22e and hepatitis B. Methods HBVP22e cDNA obtained by PCR from HBV adr subtype 1.2 copies genome plasmid p3.8II was inserted into universal vector pMD18-T for identification. The plasmids were transfected into HepG2 cells via liposome, while EGFP-HBVP22e was analyzed by Western blot, and observed with fluorescence microscope in HepG2 cells. Results Expression vectors of recombinant pEGFP-C2HBV P22e were constructed and expressed steadily in HepG2 cells. Conclusion The results can be used to explore biological activity of HBVP22e in hepatitis B.

Objective To investigate the clinical value of serum lipoprotein associated phospholipase A 2 (Lp-PLA2)as a biomarker for benign prostatic hyperplasia(BPH).Methods A total of 65 serum samples of BPH patients were selected as BPH group,64 serum samples of healthy male as control group.The serum lev-el of Lp-PLA2,total prostate specific antigen(tPSA)and free prostate specific antigen(fPSA)in both groups were detected,and the specificity and sensitivity of Lp-PLA2,F/T ratio and combine both were analyzed by ROC curve.Results The serum level of Lp-PLA2,tPSA and fPSA in BPH group were significantly higher than those in control group,the different were significant(P<0.05).ROC curve analyze shown that the area under the curve(AUC)of Lp-PLA2 was 0.763,95% confidence interval(CI)was 0.680-0.833;AUC of F/T ratio was 0.715,95% CI 0.633 -0.795;AUC of Lp-PLA2 combined with F/T ratio was 0.832,95% CI 0.756-0.892.Conclusion The serum level of Lp-PLA2 could be used as a potential diagnostic marker for BPH,and the diagnostic value of Lp-PLA2 combined with F/T ratio was better than ther single indicator. Key words:benign prostatic hyperplasia; lipoprotein associated phospholipase A 2; total prostate spe-cific antigen; free prostate specific antigen; F/T ratio