Lysozyme activity in cystic fibrosis

Area of Science:

• Biochemistry
• Immunology
• Pulmonology

Background:

• Cystic Fibrosis (CF) is a genetic disorder affecting multiple organs, characterized by chronic infections and inflammation.
• Lysozyme, an antimicrobial enzyme, plays a role in innate immunity.
• Elevated inflammatory markers are common in CF patients.

Purpose of the Study:

• To investigate serum and salivary lysozyme activity in cystic fibrosis patients.
• To compare lysozyme levels between CF patients and healthy controls.
• To explore potential correlations between lysozyme activity and clinical parameters in CF.

Main Methods:

• Serum and saliva samples were collected from 51 cystic fibrosis patients and 25 healthy controls on two separate occasions.
• Lysozyme activity was quantified using spectrophotometric assays.
• Statistical analysis, including t-tests, was performed to compare groups and assess correlations.

Main Results:

• Mean serum lysozyme activity was significantly higher in cystic fibrosis patients (10.8 µg/ml) than in controls (5.8 µg/ml) (P < 0.05).
• Mean salivary lysozyme activity did not significantly differ between cystic fibrosis patients (82.7 µg/ml) and controls (63.5 µg/ml) (P > 0.1).
• No significant correlations were found between lysozyme levels and age, sex, race, Shwachman-Kulczycki scores, bacterial colonization, or white blood cell counts.

Conclusions:

• Elevated serum lysozyme in cystic fibrosis may indicate increased granulocyte turnover due to chronic respiratory infections or a primary defect in lysosomal enzyme release.
• Further research is needed to elucidate the precise mechanisms driving altered lysozyme activity in CF.
• Lysozyme activity may serve as a potential biomarker in cystic fibrosis management.