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Abnormal Fetal Lung of Hoxa1 -/- Piglets Is Rescued by Maternal Feeding with All-Trans Retinoic Acid.
Animals : An Open Access Journal From MDPI 2023 September 8
Neonatal Hoxa1-/- piglets were characterized by dyspnea owing to the Hoxa1 mutation, and maternal administration with ATRA alleviated the dyspnea of neonatal Hoxa1-/- piglets. The purpose of this experiment was to explore how maternal ATRA administration rescued the abnormal fetal lungs of Hoxa1-/- piglets. Samples of the lungs were collected from neonatal Hoxa1-/- and non-Hoxa1-/- piglets delivered by sows in the control group, and from neonatal Hoxa1-/- piglets born by sows administered with ATRA at 4 mg/kg body weight on dpc 12, 13, or 14, respectively. These were used for the analysis of ELISA, histological morphology, immunofluorescence staining, immunohistochemistry staining, and quantitative real-time PCR. The results indicate that the Hoxa1 mutation had adverse impacts on the development of the alveoli and pulmonary microvessels of Hoxa1-/- piglets. Maternal administration with ATRA at 4 mg/kg body weight on dpc 14 rescued the abnormal lung development of Hoxa1-/- piglets by increasing the IFN-γ concentration ( p < 0.05), airspace area ( p < 0.01) and pulmonary microvessel density ( p < 0.01); increasing the expression of VEGFD ( p < 0.01), PDGFD ( p < 0.01), KDR ( p < 0.01), ID1 ( p < 0.01), and NEDD4 ( p < 0.01); and decreasing the septal wall thickness ( p < 0.01) and the expression of SFTPC ( p < 0.01) and FOXO3 ( p < 0.01). Maternal administration with ATRA plays a vital role in rescuing the abnormal development of lung of Hoxa1-/- fetal piglets.
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