Résumé
Objective To investigate the influence of EBV infection on the expression of tumor suppressor gene p53. Methods EBER1 in 217 cases of gastric carcinoma were detected with in situ hybridization. Then, EBV positive and negative cases were selected for analysis of the expression of p53 by immunohistochemistry. Results In 217 cases of gastric carcinoma, there were 23 cases with EBER1 positive. The average area (AA), mean absorbency and integral absorbency of p53 expression were higher in EBV positive gastric carcinoma than those in EBV negative. Conclusions EBV infection of gastric carcinoma is closely related to the expression of p53 in this study.
Résumé
AIM To study anti CMV effect of S ODNs complementary to the initial code region of major immediate early (MIE) mRNA, and to the intron1/exon2 boundary of MIE mRNA precursor. METHODS To evaluate the anti CMV effect by determining viral antigen on infected 2BS cells by in situ ELISA. RESULTS Both of 2 AS S ODNs and their sense sequence control showed anti CMV effect. The medium effective concentration (EC 50 ) were 4 53, 10 2, 26 2 and 30 1 ?mol?L -1 . The secretion of CMV antigens were delayed by 3 d～4 d by 8 0 ?mol?L -1 AS 1. It showed increased effect by administrating earlier postinfection, by supplementing the S ODN at intervals, by conbinating with ganciclovir, and by packaging with liposome. A slight cytotoxicity was observed at the concentration of 64 0 ?mol?L -1 . Northern blot analysis indicated that the MIE mRNA decreased after the treatment of AS 1. It suggests that disintegration of the mRNA in the hybridized duplex by activated RNase H played an important role as the mechanism of specific action, and "time and effect" analysis suggested that interference of viral adsorbtion and penetration may be the important mechanism of nonspecificity. CONCLUSION AS S ODNs targeted to MIE gene are effective anti CMV agents which can be developed as a new type of chemotherapy drugs against CMV infection.