[Cathepsin D activity in chronic rhinosinusitis with nasal polyps].

Unlabelled: Nasal polyposis affects about 1 to 4% of the population. Polyps develop in oedematous and inflammated mucous membrane. In spite of the intensive research the pathomechanism of their development is not fully understood. The majority of the theories concerning the development of nasal polyps emphasize the role of the inflammatory process causing the rupture of the epithelium and the basal membrane. Cathepsin D is one of important mediators of inflammatory processes, that may be involved in the pathogenesis of nasal polyposis.

The Aim Of The Study: was to establish the role of the cathepsin D in the pathogenesis of nasal polyps. MATHERIAL AND METHOD: Tissues were taken from 39 patients treated with endoscopic sinus surgery due to chronic rhinosinusitis with polyps. The activity of the cathepsin D was assesed with spectrofotometric method using the specific inhibitor (pepstatin) in tissue of nasal polyps, in oedematous and the inflammated mucous membrane of the nasal conchae and the samples of mucous membrane taken from the nasal septum.

Results: Statistically significant difference in cathepsin D activity between polypoid tissue, inflammated mucosa and the mucous membrane of the nasal septum was detected (t-student test, p < 0.05). No difference in the activity of this enzyme was observed between the polypoid tissue and the inflammated mucosa.

Conclusion: Increased activity of the cathepsin D in nasal polyps and inflammatory changed mucosa confirm the important role of the cathepsin D in inflammatory processes leading to damage and subsequent remodeling of mucous membrane. We believe that further research on the activity of other proteolytic enzymes is necessary to demonstrate the differences between the inflammable changed mucous membrane and nasal polyps.