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Despite knowledge that inflammatory and structural CF lung disease begins in infancy, expression profiles of MMPs and their tissue inhibitors (TIMPs) have not been previously investigated in airways of young children with CF. Aim:?To test the hypothesis that MMP-2 and MMP-9 are present in bronchoalveolar lavage fluid (BALf) from infants with CF and would positively correlate with inflammation [http://www.selleckchem.com/products/CP-673451.html CP-673451 manufacturer] severity. Method:?Children with CF (n?=?64, 0.27�C6.50 years) underwent a clinically directed annual surveillance visit including BALf. Total MMP-2, MMP-9, TIMP-2 and TIMP-1 levels in BALf were measured by ELISA. Active/proenzyme ratio of MMP-9 was determined by gelatin zymography. Neutrophil number was measured by differential and total count, IL-8 by ELISA and neutrophil elastase (NE) activity by enzymatic assay. Results presented as mean?��?SD. Results:?BALf were stratified by presence of ��104?cfu/mL infection or presence of detectable free NE activity. There was no significant difference in age between groups (2.88?��?2.17 years, ANOVA p?=?0.15). Significantly higher MMP-9/TIMP-1 ratios was associated with infection (73.42?��?138.30 vs 374.20?��?1080.00, Mann-Whitney p? but decreased significantly with free NE (12.74?��?10.78 vs 3.12?��?2.20, Mann-Whitney p? [https://en.wikipedia.org/wiki/Azastene Azastene] vs 1.12?��?0.73, Mann-Whitney p?[http://www.selleckchem.com/products/azd5363.html selleck chemicals llc] (0.67?��?0.38 vs 0.86?��?0.66, Mann-Whitney p?=?0.60). Furthermore, the imbalance of MMP and their inhibitors was only seen when NE was present. Across the study cohort, neutrophils per mL of BALf (Spearman r(64)?=?0.76, p?