Effect of Pinus massoniana Lamb. bark extract on lytic cycle of Epstein-Barr virus.

Pinus massoniana bark extract (PMBE) at a concentration of 60 μg/mL or more inhibits the expression of Epstein–Barr virus (EBV) lytic proteins, such as Rta, Zta, and EA-D. EBV lytic cycle was blocked by inhibiting the transcription of immediate-early genes. The results suggest that the PMBE has anti-EBV activity. Thus, the extract is potentially useful in preventing the lytic development of EBV in vitro.