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- W2089648889 abstract "Androgens enhance airway branching but delay alveolar maturation contributing to increased respiratory morbidity in prematurely born male infants. Hoxb5 protein positively regulates airway branching in developing lung. In other organs, androgen regulation intersects with Hox proteins and TGF β -SMAD signaling, but these interactions have not been studied in the lung. We hypothesized that androgen alteration of airway branching early in lung development requires Hoxb5 expression and that these androgen-Hoxb5 interactions occur partially through regional changes in TGF β signaling. To evaluate acute effects of androgen and TGF β on Hoxb5, E11 whole fetal mouse lungs were cultured with dihydrotestosterone (DHT) with/without Hoxb5 siRNA or TGF β inhibitory antibody. Chronic in utero DHT exposure was accomplished by exposing pregnant mice to DHT (subcutaneous pellet) from E11 to E18. DHT’s ability to enhance airway branching and alter phosphorylated SMAD2 cellular localization was partially dependent on Hoxb5. Hoxb5 inhibition also changed the cellular distribution of SMAD7 protein. Chronic in utero DHT increased Hoxb5 and altered SMAD7 mesenchymal localization. TGF β inhibition enhanced airway branching, and Hoxb5 protein cellular localization was more diffuse. We conclude that DHT controls lung airway development partially through modulation of Hoxb5 protein expression and that this level of regulation involves interactions with TGF β signaling." @default.
- W2089648889 created "2016-06-24" @default.
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- W2089648889 date "2013-01-01" @default.
- W2089648889 modified "2023-10-17" @default.
- W2089648889 title "Regulatory Interactions between Androgens, Hoxb5, and TGF<b><i>β</i></b>Signaling in Murine Lung Development" @default.
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- W2089648889 doi "https://doi.org/10.1155/2013/320249" @default.
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