Iván Millan, Salvador Pérez, Sergio Rius-Pérez, Miguel Ángel Asensi, Máximo Vento, José Manuel García-Verdugo, Isabel Torres-Cuevas
{"title":"产后缺氧预处理可减轻新生小鼠肺部因高氧而受到的损伤。","authors":"Iván Millan, Salvador Pérez, Sergio Rius-Pérez, Miguel Ángel Asensi, Máximo Vento, José Manuel García-Verdugo, Isabel Torres-Cuevas","doi":"10.1038/s41390-024-03457-0","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Preterm infants frequently require oxygen supplementation at birth. However, preterm lung is especially sensible to structural and functional damage caused by oxygen free radicals.</p><p><strong>Methods: </strong>The adaptive mechanisms implied in the fetal-neonatal transition from a lower to a higher oxygen environment were evaluated in a murine model using a custom-designed oxy-chamber. Pregnant mice were randomly assigned to deliver in 14% (hypoxic preconditioning group) or 21% (normoxic group) oxygen environment. Eight hours after birth FiO<sub>2</sub> was increased to 100% for 60 min and then switched to 21% in both groups. A control group remained in 21% oxygen throughout the study.</p><p><strong>Results: </strong>Mice in the normoxic group exhibited thinning of the alveolar septa, increased cell death, increased vascular damage, and decreased synthesis of pulmonary surfactant. However, lung histology, lamellar bodies microstructure, and surfactant integrity were preserved in the hypoxic preconditioning group after the hyperoxic insult.</p><p><strong>Conclusion: </strong>Postnatal hyperoxia has detrimental effects on lung structure and function when preceded by normoxia compared to controls. However, postnatal hypoxic preconditioning mitigates lung damage caused by a hyperoxic insult.</p><p><strong>Impact: </strong>Hypoxic preconditioning, implemented shortly after birth mitigates lung damage caused by postnatal supplemental oxygenation. The study introduces an experimental mice model to investigate the effects of hypoxic preconditioning and its effects on lung development. This model enables researchers to delve into the intricate processes involved in postnatal lung maturation. Our findings suggest that hypoxic preconditioning may reduce lung parenchymal damage and increase pulmonary surfactant synthesis in reoxygenation strategies during postnatal care.</p>","PeriodicalId":19829,"journal":{"name":"Pediatric Research","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Postnatal hypoxic preconditioning attenuates lung damage from hyperoxia in newborn mice.\",\"authors\":\"Iván Millan, Salvador Pérez, Sergio Rius-Pérez, Miguel Ángel Asensi, Máximo Vento, José Manuel García-Verdugo, Isabel Torres-Cuevas\",\"doi\":\"10.1038/s41390-024-03457-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>Preterm infants frequently require oxygen supplementation at birth. However, preterm lung is especially sensible to structural and functional damage caused by oxygen free radicals.</p><p><strong>Methods: </strong>The adaptive mechanisms implied in the fetal-neonatal transition from a lower to a higher oxygen environment were evaluated in a murine model using a custom-designed oxy-chamber. Pregnant mice were randomly assigned to deliver in 14% (hypoxic preconditioning group) or 21% (normoxic group) oxygen environment. Eight hours after birth FiO<sub>2</sub> was increased to 100% for 60 min and then switched to 21% in both groups. A control group remained in 21% oxygen throughout the study.</p><p><strong>Results: </strong>Mice in the normoxic group exhibited thinning of the alveolar septa, increased cell death, increased vascular damage, and decreased synthesis of pulmonary surfactant. However, lung histology, lamellar bodies microstructure, and surfactant integrity were preserved in the hypoxic preconditioning group after the hyperoxic insult.</p><p><strong>Conclusion: </strong>Postnatal hyperoxia has detrimental effects on lung structure and function when preceded by normoxia compared to controls. However, postnatal hypoxic preconditioning mitigates lung damage caused by a hyperoxic insult.</p><p><strong>Impact: </strong>Hypoxic preconditioning, implemented shortly after birth mitigates lung damage caused by postnatal supplemental oxygenation. The study introduces an experimental mice model to investigate the effects of hypoxic preconditioning and its effects on lung development. This model enables researchers to delve into the intricate processes involved in postnatal lung maturation. Our findings suggest that hypoxic preconditioning may reduce lung parenchymal damage and increase pulmonary surfactant synthesis in reoxygenation strategies during postnatal care.</p>\",\"PeriodicalId\":19829,\"journal\":{\"name\":\"Pediatric Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2024-09-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Pediatric Research\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1038/s41390-024-03457-0\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"PEDIATRICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Pediatric Research","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1038/s41390-024-03457-0","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PEDIATRICS","Score":null,"Total":0}
Postnatal hypoxic preconditioning attenuates lung damage from hyperoxia in newborn mice.
Background: Preterm infants frequently require oxygen supplementation at birth. However, preterm lung is especially sensible to structural and functional damage caused by oxygen free radicals.
Methods: The adaptive mechanisms implied in the fetal-neonatal transition from a lower to a higher oxygen environment were evaluated in a murine model using a custom-designed oxy-chamber. Pregnant mice were randomly assigned to deliver in 14% (hypoxic preconditioning group) or 21% (normoxic group) oxygen environment. Eight hours after birth FiO2 was increased to 100% for 60 min and then switched to 21% in both groups. A control group remained in 21% oxygen throughout the study.
Results: Mice in the normoxic group exhibited thinning of the alveolar septa, increased cell death, increased vascular damage, and decreased synthesis of pulmonary surfactant. However, lung histology, lamellar bodies microstructure, and surfactant integrity were preserved in the hypoxic preconditioning group after the hyperoxic insult.
Conclusion: Postnatal hyperoxia has detrimental effects on lung structure and function when preceded by normoxia compared to controls. However, postnatal hypoxic preconditioning mitigates lung damage caused by a hyperoxic insult.
Impact: Hypoxic preconditioning, implemented shortly after birth mitigates lung damage caused by postnatal supplemental oxygenation. The study introduces an experimental mice model to investigate the effects of hypoxic preconditioning and its effects on lung development. This model enables researchers to delve into the intricate processes involved in postnatal lung maturation. Our findings suggest that hypoxic preconditioning may reduce lung parenchymal damage and increase pulmonary surfactant synthesis in reoxygenation strategies during postnatal care.
期刊介绍:
Pediatric Research publishes original papers, invited reviews, and commentaries on the etiologies of children''s diseases and
disorders of development, extending from molecular biology to epidemiology. Use of model organisms and in vitro techniques
relevant to developmental biology and medicine are acceptable, as are translational human studies