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

Authors: Curley, Anna E  Sweet, David G  Thornton, Claire M  O'Hara, M Denis  Chesshyre, Emily  Pizzotti, Jessica  Wilbourn, Mark S  Halliday, Henry L  Warner, Jane A 
Citation: Curley AE, etal., Am J Obstet Gynecol. 2003 Apr;188(4):871-5.
Pubmed: (View Article at PubMed) PMID:12712078

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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CRRD Object Information
CRRD ID: 13204828
Created: 2017-07-20
Species: All species
Last Modified: 2017-07-20
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.