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Calcineurin/Nfat signaling is required for perinatal lung maturation and function.

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Pulmonary surfactant proteins and lipids are required for lung function after birth. Lung immaturity and resultant surfactant deficiency cause respiratory distress syndrome, a common disorder contributing to morbidity and mortality in preterm infants. Surfactant synthesis increases prior to birth in association with formation of the alveoli that mediate efficient gas exchange. To identify mechanisms controlling perinatal lung maturation, the Calcineurin b1 (Cnb1) gene was deleted in the respiratory epithelium of the fetal mouse. Deletion of Cnb1 caused respiratory failure after birth and inhibited the structural maturation of the peripheral lung. Synthesis of surfactant and a lamellar body-associated protein, ABC transporter A3 (ABCA3), was decreased prior to birth. Nuclear factor of activated T cells (Nfat) calcineurin-dependent 3 (Nfatc3), a transcription factor modulated by calcineurin, was identified as a direct activator of Sftpa, Sftpb, Sftpc, Abca3, Foxa1, and Foxa2 genes. The calcineurin/Nfat pathway controls the morphologic maturation of lungs prior to birth and regulates expression of genes involved in surfactant homeostasis that are critical for adaptation to air breathing. Publication Types: Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't

Keywords: research support, after birth, surfactant, birth, calcineurin, maturation, respiratory, prior

Authored by Dave V, Childs T, Xu Y, Ikegami M, Besnard V, Maeda Y, Wert SE, Neilson JR, Crabtree GR, Whitsett JA. Section of Neonatology, Perinatal and Pulmonary Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio 45229, USA. davev0@cchmc.org

Published in J Clin Invest. 2006 Oct;116(10):2597-609. Epub 2006 Sep 21. The full report is available online. link   A subscription to the periodical may be required.

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