Interactions between Epstein-Barr virus (EBV) and human cell lines: growth and EBV induction

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Epstein-Barr virus (EBV) is a human herpesvirus that infects B cells and epithelial cells.
• The impact of EBV infection on in vitro cell growth and viral replication differs between cell types.
• Understanding these differences is crucial for studying EBV pathogenesis and developing therapeutic strategies.

Purpose of the Study:

• To investigate the in vitro growth characteristics of EBV genome-negative and genome-positive lymphoblastoid and epithelial cell lines.
• To compare the EBV induction response to 12-O-tetradecanoylphorbol-13-acetate (TPA) in different cell types.

Main Methods:

• Culturing EBV-negative and EBV-positive lymphoblastoid cell lines (BJAB, Ramos) and epithelial cell lines (A2L/AH) in varying concentrations of fetal calf serum (FCS).
• Treating EBV-positive cells with TPA to assess EBV early antigen and viral capsid antigen induction.
• Comparing growth rates and viral antigen expression between EBV-positive and EBV-negative cells.

Main Results:

• EBV-positive cells, particularly epithelial cells, demonstrated enhanced growth in low FCS (0.75%) compared to EBV-negative cells.
• Lymphoblastoid cell lines showed no significant growth difference at higher FCS concentrations (≥2.5%).
• EBV-positive epithelial cells (cl-1) exhibited a more robust TPA-induced EBV replication, producing both early and capsid antigens, unlike lymphoblastoid cells.

Conclusions:

• EBV infection confers a growth advantage in low-serum conditions, especially in epithelial cells.
• The cellular context significantly influences EBV's impact on cell growth and viral induction.
• EBV-positive epithelial cells are a more responsive model for studying TPA-induced viral replication.