Effects of n-Butyrate on Epstein--Barr Virus-carrying Lymphoma Lines

Abstract

N-Butyrate induces Epstein-Barr virus (EBV) antigen synthesis in certain EBV-carrying lymphoma lines. The effect of n-butyrate on 2 EBV-positive Burkitt lymphoma lines was studied by immunofluorescence and EM. In the human producer line P3HR-1, the drug induced not only early antigen (EA) and virus capsid antigen (VCA) synthesis, but also increased the number of cells containing virus particles. The transition from VCA expression to the formation of virus particles was much more effective in treated cells than in EBV antigen-producing cells of the same line. The productive cycle was associated with the development of characteristic morphological changes. In the non-producer Raji cells, n-butyrate induced EA in only a minor fraction of the cells, but there were clear signs of differentiation in the direction of plasma cells. Two days after the addition of n-butyrate, 80% of the Raji cells could be classified as plasmablasts. After 72 h, 20% of the cells appeared as typical plasma cells.