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Inhibitory effects of foscarnet on herpesvirus multiplication in cell culture
Abstract:
The effect of phosphonoformate (INN; foscarnet sodium) on Herpes Simplex Virus type 1 replication in cell-culture has been studied. At 55 microM, foscarnet reduced the yield by 50 per cent which correlated well with a 50 per cent reduction of plaque formation at 60 microM. Foscarnet had to be added before 8 hours post infection to inhibit virus production. The inhibition of herpesvirus plaque formation by the presence of foscarnet for 24 hours was not reversed by the removal of the drug. The inhibition of virus replication by foscarnet could, in contrast to the inhibition by acycloguanosine, not be reversed by addition of deoxynucleosides.
Insights
Phosphonoformate (foscarnet sodium) effectively inhibits Herpes Simplex Virus type 1 replication in cell cultures. Its antiviral activity is irreversible and not overcome by deoxynucleosides, unlike other treatments.
Area of Science:
- Virology
- Antiviral Drug Research
- Molecular Biology
Background:
- Herpes Simplex Virus type 1 (HSV-1) is a significant human pathogen.
- Antiviral therapies are crucial for managing HSV-1 infections.
- Understanding drug mechanisms of action is key to developing effective treatments.
Purpose of the Study:
- To investigate the efficacy of phosphonoformate (foscarnet sodium) against HSV-1 replication.
- To determine the optimal timing and conditions for foscarnet's antiviral activity.
- To compare foscarnet's mechanism with that of acycloguanosine.
Main Methods:
- Cell culture models were used to study HSV-1 replication.
- Foscarnet sodium was administered at various concentrations and time points post-infection.
- Viral yield and plaque formation assays were performed.
- Reversal studies with deoxynucleosides were conducted.
Main Results:
- Foscarnet reduced HSV-1 yield by 50% at 55 µM and plaque formation by 50% at 60 µM.
- Inhibition required drug addition within 8 hours post-infection.
- Foscarnet's antiviral effect was irreversible upon drug removal.
- Unlike acycloguanosine, foscarnet's inhibition was not reversed by deoxynucleosides.
Conclusions:
- Foscarnet sodium demonstrates potent antiviral activity against HSV-1 in vitro.
- The drug's mechanism involves irreversible inhibition of viral replication.
- Foscarnet offers a distinct therapeutic profile compared to nucleoside analogs like acycloguanosine.