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Saijo, M. et al.

Saijo, Morikawa, Fukushi, Mizutani, Hasegawa, Nagata, Iwata, Kurane,

Inhibitory effect of mizoribine and ribavirin on the replication of severe acute respiratory syndrome (SARS)-associated coronavirus.

The activity of inosine-5'-monophosphate dehydrogenase (IMPDH) inhibitors, mizoribine and ribavirin, against severe acute respiratory syndrome (SARS)-associated coronavirus (SARS-CoV) was determined by plaque reduction and yield reduction assays. Mizoribine and ribavirin selectively inhibited replication of SARS-CoV. The 50% inhibitory concentration (IC50) of mizoribine for SARS-CoV Frankfurt-1 and SARS-CoV HKU39849, as determined by plaque reduction was 3.5 microg/ml and 16 microg/ml, respectively, and the IC50 of ribavirin for SARS-CoV Frankfurt-1 and SARS-CoV HKU39849 was 20 microg/ml and 80 microg/ml, while the 50% cytotoxic concentration of mizoribine and ribavirin for Vero E6 cells exceeded 200 microg/ml. In a yield reduction assay, mizoribine (10 microg/ml) and ribavirin (40 microg/ml) inhibited the replication of SARS-CoV and reduced the infectious SARS-CoV titers to one-tenth or less. Mizoribine inhibited replication of SARS-CoV more strongly than ribavirin. However, neither drug could completely inhibit replication of SARS-CoV even at concentrations up to 100 microg/ml.[1]

References

Inhibitory effect of mizoribine and ribavirin on the replication of severe acute respiratory syndrome (SARS)-associated coronavirus. Saijo, M., Morikawa, S., Fukushi, S., Mizutani, T., Hasegawa, H., Nagata, N., Iwata, N., Kurane, I. Antiviral Res. (2005) [Pubmed]

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