Airway Responses to Substance P in Guinea-Pigs
Author Information
Author(s): E. Boichot, V. Lagente, G. Le Gall, C. CarrY, J. M. Mencia-Huerta, P. Braquet, A. Lockhart, N. Frossard
Primary Institution: Laboratoire de Physiologie Respiratoire, U FR Cochin-Port Royal, Paris, France
Hypothesis
The study investigates how antigen challenge affects airway responses to substance P and NEP activity in guinea-pigs.
Conclusion
Antigen challenge in sensitized guinea-pigs leads to increased airway hyperresponsiveness to substance P, but this is not due to changes in smooth muscle response in vitro.
Supporting Evidence
- Bronchial hyperresponsiveness was observed in vivo after antigen challenge.
- Histological studies showed eosinophil accumulation in the tracheal submucosa after antigen challenge.
- Responses to substance P were enhanced in guinea-pigs pretreated with NEP inhibitor phosphoramidon.
Takeaway
When guinea-pigs are exposed to an allergen, their airways become more sensitive to a substance called substance P, but this doesn't change how their airway muscles react in lab tests.
Methodology
Guinea-pigs were sensitized and challenged with an aerosol of ovalbumin, and their airway responses were measured in vivo and in vitro.
Limitations
The study was conducted on guinea-pigs, which may not fully represent human responses.
Participant Demographics
Specific pathogen-free male Hartley guinea-pigs, weighing 350-400 g.
Statistical Information
P-Value
p<0.01
Statistical Significance
p<0.01
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