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J Virol. 1973 December; 12(6): 1442-1445
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Effect of Dibutyryl Cyclic AMP on the Induction of Epstein-Barr Virus in Hybrid Cells

Department of Microbiology, The Milton S. Hershey Medical Center, The Pennsylvania State University, Hershey, Pennsylvania

ABSTRACT

Treatment of Epstein-Barr virus (EBV) negative somatic cell hybrids with 5'-iododeoxyuridine (IUdR) induced synthesis of EBV antigens and virus particles. When dibutyryl cAMP (Bt₂-cAMP) was present in medium after exposure of cultures to IUdR, the incidence of cells synthesizing EBV early and virus capsid antigens was increased. The time necessary for appearance of EBV particles after induction by IUdR was significantly reduced in the presence of Bt₂-cAMP. This enhancement was evident to a lesser degree with 3':5' cAMP than with Bt₂-cAMP and did not occur with any other of the related compounds tested. The response observed was dose dependent. Untreated (no IUdR) EBV negative hybrid cells exposed to Bt₂-cAMP also synthesized EBV antigens. The concentration of intracellular cAMP may act as one of the control mechanisms selecting for gene expression in this system.