Productive Infection of Epstein–Barr Virus (EBV) in EBV-Genome-Positive Epithelial Cell Lines (GT38 and GT39) Derived from Gastric Tissues

Abstract

We characterized the expression of Epstein–Barr virus (EBV) on two epithelial cell lines, GT38 and GT39, derived from human gastric tissues. The EBV nuclear antigen (EBNA) was detected in all cells of both cell lines. The EBV immediate-early BZLF1 protein (ZEBRA), the early antigen diffuse component (EA-D), and one of the EBV envelope proteins (gp350/220) were expressed spontaneously in small proportions in the cells. EBNA1, EBNA2, latent membrane protein 1, ZEBRA, and EA-D molecules were then observed by Western blotting in the cells. The lytic cycle was enhanced with treatment with 12-O-tetradecanoylphorbol-13-acetate (TPA) orn-butyrate. The virus particles were observed in the TPA treated GT38 cells by electron microscopy. Infectious EBV was detected with the transformation of cord blood lymphocytes and also with the induction of early antigen to Raji cells by the supernatants of both cell lines. A major single and minor multiple fused terminal fragments and a ladder of smaller fragments of the EBV genome were detected with aXhoI probe in both cell lines. These epithelial cell lines and viruses will be useful in studying their association with EBV in gastric epithelial cells.