An elastase-specific inhibitor from human bronchial mucus. Pathogenesis in lung emphysema

Area of Science:

• Pulmonary Medicine
• Biochemistry

Background:

• Human bronchial mucus contains a unique elastase-specific inhibitor, distinct from known inhibitors like alpha 1-antitrypsin.
• Elastase activity in the airways is implicated in obstructive airway diseases.

Purpose of the Study:

• To quantify the elastase-specific inhibitor in bronchial mucus of patients with obstructive airway disease.
• To investigate the presence and activity of this inhibitor in relation to elastolytic activity.

Main Methods:

• Analysis of bronchial mucus from 100 patients with obstructive airway disease.
• Measurement of elastase-specific inhibitor levels (free and complexed).
• Assay for free elastolytic activity and anti-elastolytic activity.

Main Results:

• 18 patients exhibited no inhibitor but free elastolytic activity.
• 82 patients showed no elastolytic activity but free anti-elastolytic activity and complexed inhibitor.
• In 20 cases, the inhibitor was undetectable in any form.

Conclusions:

• The study identified a distinct elastase-specific inhibitor in bronchial mucus.
• Inhibitor deficiency or inactivation, potentially via oxidation, may contribute to obstructive airway disease.
• Further research is needed to elucidate the role of this inhibitor in respiratory health.