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

Abstract

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.

• Authors: Masayuki Saijo, Shigeru Morikawa, Shuetsu Fukushi, Tetsuya Mizutani, Hideki Hasegawa, Noriyo Nagata, Naoko Iwata, Ichiro Kurane
• Journal: Antiviral research (Antiviral Res) Vol. 66 Issue 2-3 Pg. 159-63 (Jun 2005) ISSN: 0166-3542 [Print] Netherlands
• PMID: 15911031 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antiviral Agents
• Ribonucleosides
• Ribavirin
• mizoribine

Topics

• Animals
• Antiviral Agents (chemistry, pharmacology)
• Chlorocebus aethiops
• Microbial Sensitivity Tests
• Ribavirin (chemistry, pharmacology)
• Ribonucleosides (chemistry, pharmacology)
• Severe acute respiratory syndrome-related coronavirus (drug effects, enzymology, genetics, physiology)
• Vero Cells
• Virus Replication (drug effects)