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- Title
Neonatal Hyperoxia Activates Activating Transcription Factor 4 to Stimulate Folate Metabolism and Alveolar Epithelial Type 2 Cell Proliferation.
- Authors
Min Yee; McDavid, Andrew N.; Cohen, Ethan David; Huyck, Heidie L.; Poole, Cory; Altman, Brian J.; Maniscalco, William M.; Deutsch, Gail H.; Pryhuber, Gloria S.; O’Reilly, Michael A.
- Abstract
Oxygen supplementation in preterm infants disrupts alveolar epithelial type 2 (AT2) cell proliferation through poorly understood mechanisms. Here, newborn mice are used to understand how hyperoxia stimulates an early aberrant wave of AT2 cell proliferation that occurs between Postnatal Days (PNDs) 0 and 4. RNA-sequencing analysis of AT2 cells isolated from PND4 mice revealed hyperoxia stimulates expression of mitochondrial-specific methylenetetrahydrofolate dehydrogenase 2 and other genes involved in mitochondrial one-carbon coupled folate metabolism and serine synthesis. The same genes are induced when AT2 cells normally proliferate on PND7 and when they proliferate in response to the mitogen fibroblast growth factor 7. However, hyperoxia selectively stimulated their expression via the stress-responsive activating transcription factor 4 (ATF4). Administration of the mitochondrial superoxide scavenger mitoTEMPO during hyperoxia suppressed ATF4 and thus early AT2 cell proliferation, but it had no effect on normative AT2 cell proliferation seen on PND7. Because ATF4 and methylenetetrahydrofolate dehydrogenase are detected in hyperplastic AT2 cells of preterm infant humans and baboons with bronchopulmonary dysplasia, dampening mitochondrial oxidative stress and ATF4 activation may provide new opportunities for controlling excess AT2 cell proliferation in neonatal lung disease.
- Subjects
CELL proliferation; TRANSCRIPTION factors; HYPEROXIA; FIBROBLAST growth factors; PREMATURE infants; FOLIC acid; BREAST milk
- Publication
American Journal of Respiratory Cell & Molecular Biology, 2022, Vol 66, Issue 4, p402
- ISSN
1044-1549
- Publication type
Article
- DOI
10.1165/rcmb.2021-0363OC