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Interleukin-1 receptor antagonist prevents murine bronchopulmonary dysplasia induced by perinatal inflammation and hyperoxia

Author:
Nold, Marcel F., Mangan, Niamh E., Rudloff, Ina, Cho, Steven X., Shariatian, Nikeh, Samarasinghe, Thilini D., Skuza, Elizabeth M., Pedersen, John, Veldman, Alex, Berger, Philip J., Nold-Petry, Claudia A.
Source:
Proceedings of the National Academy of Sciences of the United States of America 2013 v.110 no.35 pp. 14384-14389
ISSN:
0027-8424
Subject:
antagonists, bronchopulmonary dysplasia, cell viability, dendritic cells, gas exchange, hyperoxia, immune response, inflammation, interleukin-1alpha, interleukin-1beta, lipopolysaccharides, lungs, macrophages, mice, neonates, pathogenesis, patients, premature birth, prognosis, pups, rearing, therapeutics
Abstract:
Bronchopulmonary dysplasia (BPD) is a common lung disease of premature infants, with devastating short- and long-term consequences. The pathogenesis of BPD is multifactorial, but all triggers cause pulmonary inflammation. No therapy exists; therefore, we investigated whether the anti-inflammatory interleukin-1 receptor antagonist (IL-1Ra) prevents murine BPD. We precipitated BPD by perinatal inflammation (lipopolysaccharide injection to pregnant dams) and rearing pups in hyperoxia (65% or 85% O ₂). Pups were treated daily with IL-1Ra or vehicle for up to 28 d. Vehicle-injected animals in both levels of hyperoxia developed a severe BPD-like lung disease (alveolar number and gas exchange area decreased by up to 60%, alveolar size increased up to fourfold). IL-1Ra prevented this structural disintegration at 65%, but not 85% O ₂. Hyperoxia depleted pulmonary immune cells by 67%; however, extant macrophages and dendritic cells were hyperactivated, with CD11b and GR1 (Ly6G/C) highly expressed. IL-1Ra partially rescued the immune cell population in hyperoxia (doubling the viable cells), reduced the percentage that were activated by up to 63%, and abolished the unexpected persistence of IL-1α and IL-1β on day 28 in hyperoxia/vehicle-treated lungs. On day 3, perinatal inflammation and hyperoxia each triggered a distinct pulmonary immune response, with some proinflammatory mediators increasing up to 20-fold and some amenable to partial or complete reversal with IL-1Ra. In summary, our analysis reveals a pivotal role for IL-1α/β in murine BPD and an involvement for MIP (macrophage inflammatory protein)-1α and TREM (triggering receptor expressed on myeloid cells)-1. Because it effectively shields newborn mice from BPD, IL-1Ra emerges as a promising treatment for a currently irremediable disease that may potentially brighten the prognosis of the tiny preterm patients.
Agid:
1737906