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Antiviral and interferon-inducing activity of a new glutarimide antibiotic, 9-methylstreptimidone
Abstract:
The antiviral effect of 9-methylstreptimidone (9-MS) was examined in mice infected with mouse-adapted influenza A(2) (H(2)N(2)) virus. Both a single and continuous prophylactic administration of 9-MS protected mice from virus infection, and comparison between the minimal effective and the 50% lethal dose gave a therapeutic index of 60. When the treatment was started after infection, however, no antiviral effect was demonstrated. After a single intraperitoneal administration of 9-MS, a highly potent virus-inhibitory factor was detected in the lungs (10 h later) and the sera (16 h later) of uninfected mice, which was assumed to be an interferon on the basis of the biological characteristics. These results suggest that the protective activity of the antibiotic is due to interferon induction in mice.
Insights
9-methylstreptimidone (9-MS) demonstrated significant antiviral protection against influenza A(2) in mice when administered prophylactically. The antibiotic appears to work by inducing interferon, a potent virus-inhibitory factor.
Area of Science:
- Virology
- Immunology
- Pharmacology
Background:
- Influenza A virus poses a significant global health threat.
- Antiviral agents are crucial for managing influenza infections.
- 9-methylstreptimidone (9-MS) is an antibiotic with potential antiviral properties.
Purpose of the Study:
- To investigate the antiviral efficacy of 9-methylstreptimidone (9-MS) against influenza A(2) virus in a murine model.
- To determine the therapeutic index and optimal administration timing of 9-MS.
- To elucidate the mechanism of antiviral action of 9-MS.
Main Methods:
- Infection of mice with mouse-adapted influenza A(2) (H(2)N(2)) virus.
- Administration of 9-MS prophylactically (single and continuous) and therapeutically (post-infection).
- Assessment of antiviral protection, determination of minimal effective dose and 50% lethal dose, and detection of virus-inhibitory factors in lungs and sera.
Main Results:
- Prophylactic administration of 9-MS (single or continuous) conferred significant protection against influenza A(2) infection in mice.
- A high therapeutic index of 60 was calculated for 9-MS.
- No antiviral effect was observed when 9-MS treatment was initiated after infection.
- A potent virus-inhibitory factor, presumed to be interferon, was detected in mice treated with 9-MS.
Conclusions:
- 9-methylstreptimidone (9-MS) exhibits potent prophylactic antiviral activity against influenza A(2) in mice.
- The protective effect of 9-MS is likely mediated by the induction of interferon.
- 9-MS may represent a promising therapeutic candidate for influenza prevention.