NDLI: Failure of ductus arteriosus closure and remodeling in neonatal mice deficient in cyclooxygenase-1 and cyclooxygenase-2.

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Failure of ductus arteriosus closure and remodeling in neonatal mice deficient in cyclooxygenase-1 and cyclooxygenase-2.

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Failure of ductus arteriosus closure and remodeling in neonatal mice deficient in cyclooxygenase-1 and cyclooxygenase-2.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Goulet, J. L. Smithies, O. Hawkins, B. M. Morham, S. G. Loftin, C. D. Langenbach, R. Tiano, H. F. Lee, C. A. Trivedi, D. B. Nguyen, M. Epstein, J. A. Breyer, M. D. Clark, J. A. Koller, B. H.
Description	Author Affiliation: Loftin CD ( Laboratory of Environmental Carcinogenesis and Mutagenesis, Comparative Medicine Branch, National Institutes of Health, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA.);
Abstract	The transition to pulmonary respiration following birth requires rapid alterations in the structure of the mammalian cardiovascular system. One dramatic change that occurs is the closure and remodeling of the ductus arteriosus (DA), an arterial connection in the fetus that directs blood flow away from the pulmonary circulation. A role for prostaglandins in regulating the closure of this vessel has been supported by pharmacological and genetic studies. The production of prostaglandins is dependent on two cyclooxygenases (COX-1 and COX-2), which are encoded by separate genes. We report here that the absence of either or both COX isoforms in mice does not result in premature closure of the DA in utero. However, 35% of COX-2(-/-) mice die with a patent DA within 48 h of birth. In contrast, the absence of only the COX-1 isoform does not affect closure of the DA. The mortality (35%) and patent DA incidence due to absence of COX-2 is, however, significantly increased (79%) when one copy of the gene encoding COX-1 is also inactivated. Furthermore, 100% of the mice deficient in both isoforms die with a patent DA within 12 h of birth, indicating that in COX-2-deficient mice, the contribution of COX-1 to DA closure is gene dosage-dependent. Together, these data establish roles for COX-1, and especially for COX-2, in the transition of the cardiopulmonary circulation at birth.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	3
Volume Number	98
Language	English
Publisher	National Academy of Sciences
Publisher Date	2001-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Ductus Arteriosus, Patent Genetics Isoenzymes Metabolism Prostaglandin-Endoperoxide Synthases Animals Animals, Newborn Cyclooxygenase 1 Cyclooxygenase 2 Ductus Arteriosus Pathology Epidemiology Genomic Imprinting Genotype Deficiency Membrane Proteins Mice Mice, Inbred C57BL Mice, Inbred Strains Mice, Knockout Time Factors Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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