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Depletion of Retinyl Esters in the Lungs Coincides with Lung Prenatal Morphological Maturation

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Abstract

Close to birth rat fetuses have lungs which are depleted in retinyl esters. Glucocorticoids administered to pregnant rats accelerate this process. We have investigated changes in fetal lung levels of retinol and retinyl palmitate and accompanying morphological changes after administration of dexamethasone to pregnant rats on day 18 of pregnancy. Here we show that this depletion temporarily coincides with prenatal morphological maturation of the lungs. The data presented support the idea that the maturational effect of glucocorticoids in the developing lungs is linked to vitamin A metabolism.

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    Citation Excerpt :

    In fetal rat lungs, the concentration of retinyl palmitate and total retinyl ester levels increases rapidly to a peak on gestational day 18. There is a steady decline thereafter reaching a nadir after birth [35-37]. Based on these findings, we chose embryonic days 18, 19, and 20 of gestation for retinoic acid treatment.

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