Effect of transforming growth factor-β1 on the cell growth and Epstein-Barr virus reactivation in EBV-infected epithelial cell lines

Transforming growth factor (TGF)-beta1 is a multifunctional cytokine that plays important roles in regulating cell growth and differentiation in many biological systems. In this study, we found that gastric tissue-derived Epstein-Barr virus (EBV)-infected epithelia[ cell lines GT38 and GT39 had resistance to TGF-beta1-mediated growth inhibition and apoptosis compared to a TGF-beta1 -susceptible gastric carcinoma cell line HSC-39. However, TGF-beta1 partially Induced EBV reactivation In GT38 and GT39 cells, as shown by the Induction of EBV immediate-early BZLF1 RNA and its protein product ZEBRA and early antigen-D. The expressions of TGF-beta receptor I and II were detected in GT38 and GT39 cells by Northern and Western blot analyses. Both cell lines spontaneously produced the TGF-beta1, which was sufficient for inhibiting cell growth of HSC-39 cells. Taken together, these data suggest that TGF-beta1 may be a key factor for EBV reactivation and selective growth of EBV-infected epithelial cells in vivo. (C) 2001 Academic Press.