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Chorioamnionitis and increased neonatal lung lavage fluid matrix metalloproteinase-9 levels: implications for antenatal origins of chronic lung disease

Curley, Anna E., Sweet, David G., Thornton, Claire M., O'Hara, M. Denis, Chesshyre, Emily, Pizzotti, Jessica, Wilbourn, Mark S., Halliday, Henry L. and Warner, Jane A. (2003) Chorioamnionitis and increased neonatal lung lavage fluid matrix metalloproteinase-9 levels: implications for antenatal origins of chronic lung disease American Journal of Obstetrics and Gynecology, 188, (4), pp. 871-875. (doi:10.1067/mob.2003.215).

Record type: Article


Objective: matrix metalloproteinase-9 (MMP-9) degrades type IV collagen, the major constituent of lung basement membrane. We studied the effects of chorioamnionitis and antenatal corticosteroids on bronchoalveolar lavage (BAL) fluid levels of MMP-9, and its inhibitor, TIMP-1 in preterm infants.
Study Design: a prospective study was performed on serial BAL samples from 79 ventilated preterm infants at less than 33 weeks' gestation, 18 of whom were from pregnancies complicated by chorioamnionitis. MMP-9 levels were measured by gelatin zymography and TIMP-1 by enzyme-linked immunosorbent assay, and the median value for each infant was calculated. The presence and severity of chorioamnionitis were defined histologically.
Results: BAL fluid MMP-9 levels were higher in preterm infants in the chorioamnionitis group (86 [29-518] vs 13 [3-43] ng/mL, P = .001), and levels increased stepwise with the increasing severity of chorioamnionitis. Antenatal corticosteroids had no effect on median MMP-9 levels. Infants in the chorioamnionitis group were more likely to have chronic lung disease (CLD) develop (55% vs 28%, P < .05). TIMP-1 levels were no different between groups.
Conclusion: chorioamnionitis is associated with increased lung type IV collagenase levels in the ventilated preterm infant. Antenatal lung inflammation with up-regulation of MMP-9 may be important in the pathogenesis of CLD.

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Published date: April 2003
Keywords: preterm, antenatal corticosteroids, chorioamnionitis, matrix metalloproteinases, chronic lung disease


Local EPrints ID: 45461
ISSN: 0002-9378
PURE UUID: db27a5ae-1613-418d-a94a-b810f58a5245

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Date deposited: 30 Mar 2007
Last modified: 17 Jul 2017 15:12

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Author: Anna E. Curley
Author: David G. Sweet
Author: Claire M. Thornton
Author: M. Denis O'Hara
Author: Emily Chesshyre
Author: Jessica Pizzotti
Author: Mark S. Wilbourn
Author: Henry L. Halliday
Author: Jane A. Warner

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