Cytotoxic and anti-HSV-1 activities MCF7 cells were supplied by the Cell Resource Center for
the Biomedical Research, Institute of Development, Aging and Cancer, Tohoku University. B16F2F cells were supplied by the Riken Bioresource Center. Both cell lines were maintained in RPMI1640 medium with 10% FBS at 37 C under 5% CO2 atmosphere. Cytotoxic experiments were carried out in quadruplicate in 96-well microplates, and the amount of viable cells at the end of the incubation was determined by using an WST-8 assay.17 GI50 values of CDDP were 2.28 and 13.0 mM againt MCF7 and B16F2F, respectively. HSV-1 strain KOS and Vero cells were provided by the Chemo-Sero Therapeutic Institute. The antiviral activity of test samples on HSV-1 (KOS) was
measured by the plaque assay19 described previous paper.EC50 of acyclovir was 0.39 mg/ml.