Functional interplay of Epstein -Barr virus oncoproteins in a mouse model of B cell

Sommermann, Thomas; Yasuda, Tomoharu; Ronen, Jonathan; Wirtz, Tristan; Weber, Timm; Sack, Ulrike; Caeser, Rebecca; Zhang, Jingwei; Li, Xun; Trung, Chu van; Jauch, Anna; Unger, Kristian; Hodson, Daniel J.; Akalin, Altuna und Rajewsky, Klaus (2020): Functional interplay of Epstein -Barr virus oncoproteins in a mouse model of B cell. In: Proceedings of the National Academy of Sciences of the United States of America, Bd. 117, Nr. 25: S. 14421-14432

Abstract

Epstein-Barr virus (EBV) is a B cell transforming virus that causes B cell malignancies under conditions of immune suppression. EBV orchestrates B cell transformation through its latent membrane proteins (LMPs) and Epstein-Barr nuclear antigens (EBNAs). We here identify secondary mutations in mouse B cell lymphomas induced by LMP1, to predict and identify key functions of other EBV genes during transformation. We find aberrant activation of early B cell factor 1 (EBF1) to promote transformation of LMP1-expressing B cells by inhibiting their differentiation to plasma cells. EBV EBNA3A phenocopies EBF1 activities in LMP1-expressing B cells, promoting transformation while inhibiting differentiation. In cells expressing LMP1 together with LMP2A, EBNA3A only promotes lymphomagenesis when the EBNA2 target Myc is also overexpressed. Collectively, our data support a model where proproliferative activities of LMP1, LMP2A, and EBNA2 in combination with EBNA3A-mediated inhibition of terminal plasma cell differentiation critically control EBV-mediated B cell lymphomagenesis.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0027-8424
• Sprache: Englisch