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Intra-amniotic injection of IL-1 induces inflammation and maturation in fetal sheep lung

journal contribution
posted on 2002-01-01, 00:00 authored by K E Willet, B W Kramer, S G Kallapur, M Ikegami, J P Newnham, T J Moss, Peter Sly, A H Jobe
Antenatal inflammation may be an important triggering event in the pathogenesis of bronchopulmonary dysplasia but may also accelerate fetal lung maturation. We examined the effects of intra-amniotic (IA) interleukin (IL)-1α and IL-1β on maturation of the fetal sheep lung. These cytokine effects were compared with IA endotoxin, a potent proinflammatory stimulus that accelerated lung maturation. Date-bred ewes received 15 or 150 μg recombinant ovine IL-1α or IL-1β or 10 mg Escherichia coli endotoxin by IA injection at 118 days gestation (term = 150 days), and fetuses were delivered at 125 days. IL-1α and IL-1β improved lung function and increased alveolar saturated phosphatidylcholine (Sat PC) and surfactant protein mRNA expression at the higher dose. The maturation response to IL-1α was greater than that to IL-1β, which was similar to endotoxin response. Inflammation was also more pronounced after IL-1α treatment. Only endotoxin animals had residual inflammation of the fetal membranes at 7 days. Lung compliance, lung volume, and alveolar Sat PC were positively correlated with residual alveolar wash leukocyte numbers 7 days after IL-1 treatment, suggesting a link between lung inflammation and maturation.

History

Journal

American Journal of Physiology - Lung Cellular and Molecular Physiology

Volume

282

Issue

3 26-3

ISSN

1040-0605