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Effect of interferon, polyacrylin acid, and polymethacrylic acid on tail lesions on mice infected with vaccinia virus
Abstract:
Intravenous inoculation of mice with vaccinia virus produced characteristic lesions of the tail surface which were suppressed by intraperitoneal administration of interferon and polyacrylic acid (PAA). Polymethacrylic acid (PMAA) stimulated the formation of vaccinia virus lesions. For full activity, both interferon and PAA must be given prior to infection. PAA was still significantly effective at small dose levels (3 mg/kg) and achieved protection for at least 4 weeks. Protection increased with increasing molecular weight of the polymer. The mode of action of PAA is discussed.
Insights
Interferon and polyacrylic acid (PAA) suppressed vaccinia virus lesions in mice. PAA demonstrated significant protection even at low doses and increased effectiveness with higher molecular weight.
Area of Science:
- Virology
- Immunology
- Polymer Science
Background:
- Vaccinia virus infection in mice causes tail surface lesions.
- Interferon is known to have antiviral properties.
- The role of synthetic polymers in modulating viral infections requires further investigation.
Purpose of the Study:
- To investigate the effect of polyacrylic acid (PAA) and polymethacrylic acid (PMAA) on vaccinia virus-induced lesions in mice.
- To determine the optimal administration timing and dose-response relationship for PAA.
- To explore the influence of polymer molecular weight on protective efficacy.
Main Methods:
- Intravenous inoculation of mice with vaccinia virus.
- Intraperitoneal administration of interferon and PAA.
- Observation and quantification of vaccinia virus-induced tail lesions.
- Dose-response and molecular weight studies of PAA.
Main Results:
- Intraperitoneal interferon and PAA significantly suppressed vaccinia virus lesions.
- Polymethacrylic acid (PMAA) exacerbated lesion formation.
- Optimal protection required pre-infection administration of interferon and PAA.
- PAA showed significant efficacy at 3 mg/kg, providing protection for at least 4 weeks.
- Higher molecular weight PAA correlated with increased protection.
Conclusions:
- Polyacrylic acid (PAA) demonstrates significant antiviral activity against vaccinia virus in a mouse model.
- PAA's efficacy is dose-dependent and influenced by molecular weight, with higher weights being more protective.
- Pre-infection administration is crucial for PAA's protective effect, suggesting a prophylactic rather than therapeutic mechanism.