Rat model of platelet-activating factor-induced rhinosinusitis

Area of Science:

• Immunology
• Pathology
• Otolaryngology

Background:

• Platelet-Activating Factor (PAF) is a known inflammatory mediator, particularly in allergic conditions.
• Its specific role in the development of rhinosinusitis remains unclear.
• Developing an animal model is crucial for investigating PAF's contribution to rhinosinusitis.

Purpose of the Study:

• To establish a rat model of rhinosinusitis induced by intranasal administration of PAF.
• To histologically characterize the inflammatory changes in the sinonasal cavity following PAF exposure.

Main Methods:

• Sprague-Dawley rats received intranasal PAF (16 microg/mL) or vehicle.
• Animals were sacrificed at 1, 3, or 5 days post-administration.
• Histological analysis assessed neutrophil clusters, eosinophils, epithelial loss, goblet cells, and inducible nitric oxide synthase (iNOS)-positive cells.

Main Results:

• Intranasal PAF application induced significant rhinosinusitis in rats.
• Histological findings included neutrophil clusters, increased eosinophils, epithelial damage, goblet cell hyperplasia, and elevated iNOS-positive cells.
• Inflammation peaked at day 3 and varied over the observed time course.

Conclusions:

• Intranasal PAF successfully induces rhinosinusitis in a rat model.
• The model exhibits characteristic histological features of sinonasal inflammation.
• This PAF-induced rhinosinusitis rat model can advance understanding of PAF's role in disease pathogenesis.