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Anti-infectious effect of C granulosum-derived P40 immunomodulator given by aerosolization and intranasal
B Bizzini1, M Carlotti, M Fattal German
1Unité de Toxinologie Moléculaire, Institut Pasteur, Paris, France.
Abstract:
It is known that C granulosum-derived P40 immunomodulator displays strong anti-microbial effects in mice by the intravenous route. Since microbial contamination of humans occurs in many instances via the airways, the effect of P40 on infections was investigated when it was given intranasally or by aerosolization. In order to augment its bioavailability, P40 was derivatized by coupling with polylysine chains (P40-PL). The results showed that P40-PL exercised a significant protective effect, both by the intranasal route and by aerosolization on both influenza and K pneumoniae infections produced by aerosolization or intranasal instillation. Stimulation of the phagocytic capacity of alveolar macrophages by these types of treatment is likely to account for the increased resistance of mice toward microbial infections.
Insights
This study shows that P40-polylysine (P40-PL), an immunomodulator, effectively protects mice against respiratory infections like influenza and K pneumoniae when administered intranasally or via aerosol. This enhanced resistance is likely due to stimulated macrophage activity.
Area of Science:
- Immunology
- Microbiology
- Pharmacology
Background:
- The P40 immunomodulator, derived from C granulosum, demonstrates potent antimicrobial activity intravenously.
- Airway exposure is a common route for microbial infections in humans.
- Investigating alternative delivery methods for P40 is crucial for respiratory infections.
Purpose of the Study:
- To evaluate the efficacy of intranasal and aerosolized P40 in treating respiratory infections.
- To assess the impact of polylysine derivatization on P40's bioavailability and effectiveness.
- To understand the mechanism behind P40's protective effects against airborne pathogens.
Main Methods:
- P40 was derivatized with polylysine chains (P40-PL) to enhance bioavailability.
- Mice were infected with influenza and K pneumoniae via aerosolization or intranasal instillation.
- The protective effects of intranasal and aerosolized P40-PL were assessed.
- Phagocytic capacity of alveolar macrophages was analyzed.
Main Results:
- P40-PL demonstrated significant protection against both influenza and K pneumoniae infections.
- The protective effects were observed with both intranasal and aerosolized administration routes.
- Treatment with P40-PL stimulated the phagocytic capacity of alveolar macrophages.
Conclusions:
- Intranasal and aerosolized P40-PL are effective in combating respiratory microbial infections.
- Polylysine conjugation enhances P40's efficacy for airway delivery.
- Stimulation of alveolar macrophage phagocytosis is a key mechanism for P40-mediated protection.