Antiviral activity of WIN 54954 in coxsackievirus B2 carrier state infected human myocardial fibroblasts.

Abstract

Persistent infections with a cardiotropic enterovirus, e.g. coxsackievirus B2 (CVB2), cause chronic myocarditis and eventually congestive heart failure. Therefore, the antiviral activity of WIN 54954, a capsid binding antiviral agent that inhibits enterovirus uncoating, was studied in persistently CVB2-infected cultures of human myocardial fibroblasts. Cultures displayed a typical carrier state infection with virus titers of 3.9 +/- 1.6 x 10(5) plaque forming units (PFU)/ml and 0.99% infected cells. WIN 54954 (0.025-1 microg/ml) application was started 7 days after infection of the cultures. Compared to the WIN 54954 concentration resulting in a 90% plaque number reduction (EC90 = 0.197 microg/ml) in acutely infected Vero cells, WIN 54954 reduced virus yields of myocardial fibroblast cultures more efficiently, e.g. more than 100 fold (99%) with 0.025 microg/ml after 4 days of application. Antiviral effects of WIN 54954 increased with application time and at 0.025 microg/ml Win 54954 completely inhibited infectious virus progeny after 16 days. Increasing the WIN 54954 concentration up to 1 microg/ml did not cause a greater inhibition of virus replication. In situ hybridization demonstrated that at 0.1 microg/ml WIN 54954 reduced the number of infected cells from 0.99 to 0.18%, although a complete eradication of CVB2-infected cells was not achieved at concentrations as high as 1 microg/ml. In conclusion, the results indicate that low concentrations of WIN 54954 are effective in treating persistent enterovirus infections of myocardial fibroblasts, although a complete eradication of the infection is not achieved with WIN 54954 as a single antiviral agent.

• Authors: A Heim, U Pfetzing, G Müller, I M Grumbach
• Journal: Antiviral research (Antiviral Res) Vol. 37 Issue 1 Pg. 47-56 (Jan 1998) ISSN: 0166-3542 [Print] Netherlands
• PMID: 9497072 (Publication Type: Journal Article)

Chemical References

• Antiviral Agents
• Isoxazoles
• Win 54954
• RNA-Directed DNA Polymerase

Topics

• Animals
• Antiviral Agents (pharmacology)
• Carrier State (drug therapy, virology)
• Cells, Cultured
• Chlorocebus aethiops
• Coxsackievirus Infections (drug therapy, virology)
• Dose-Response Relationship, Drug
• Enterovirus B, Human (drug effects, physiology)
• Fibroblasts (virology)
• Heart (virology)
• Humans
• In Situ Hybridization
• Isoxazoles (administration & dosage, pharmacology)
• Polymerase Chain Reaction
• RNA-Directed DNA Polymerase
• Vero Cells
• Viral Plaque Assay
• Virus Replication (drug effects)