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A series of sulfonic acid polymers were shown to be potent and selective inhibitors of respiratory syncytial virus (RSV) and influenza A virus. The compounds inhibit the replication of RSV and influenza A virus in HeLa and MDCK cells, at concentrations of 0.16 and 4.0 micrograms/ml, respectively, and are nontoxic to growing cells at concentrations of &gt; 100 micrograms/ml. The mode of antiviral action of the sulfonic acid polymers can be ascribed to inhibition of virus-cell fusion (for influenza A virus) or inhibition of both virus-cell binding and fusion (for RSV). The sulfonic acid prototype PAMPS [poly(2-acrylamido-2-methyl-1-propanesulfonic acid)], when administered intranasally to mice as a single dose of 10 or 50 mg per kg of body weight at the time of infection, completely inhibited influenza A virus replication (in lungs) and virus-associated lung consolidation in immunocompetent mice and completely protected NMRI and SCID (severe combined immune deficiency) mice against influenza A virus-associated mortality. When administered 1 h before or after virus inoculation, no protective effect was observed at a dose of 10 or 100 mg/kg. Sulfonic acid polymers exert selective inhibitory effects on RSV and influenza A virus replication.

antimicrobial agents and chemotherapy

In vitro and in vivo inhibition of ortho- and paramyxovirus infections by a new class of sulfonic acid polymers interacting with virus-cell binding and/or fusion