||Prenatal Dexamethasone Administration Disrupts the Pattern of Cellular Development in Rat Lung.
Navarro, H. A. ;
Kudlacz, E. M. ;
Eylers, J. P. ;
Slotkin, T. A. ;
||Duke Univ. Medical Center, Durham, NC. Dept. of Pharmacology.;Health Effects Research Lab., Research Triangle Park, NC.
Deoxyribonucleic acids ;
Cell division ;
Prenatal exposure delayed effects ;
Organ weight ;
Ornithine decarboxylase ;
Beta adrenergic receptors ;
Cell differentiation ;
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||To examine whether prenatal exposure to glucocorticoids could adversely affect subsequent cellular development of the lung, the authors administered 0.2 mg/kg of dexamethasone to pregnant rats on gestational days 17, 18, and 19. Lungs of the offspring were then examined for patterns of cell acquisition (DNA) and growth (protein). DNA concentration (a marker of cell packing density) and DNA content (a measure of total cell numbers) were reduced during gestation, and the shortfalls in concentration persisted past weaning. Disruption of development was also apparent in the protein/DNA ratio, which was consistently elevated, a finding consistent with cellular hypertrophy. In addition, lung ornithine decarboxylase became coupled to beta-adrenergic receptors prematurely in the dexamethasone group, suggesting that neural control of tissue differentiation is altered. These data indicate that prenatal glucocorticoids may compromise lung development through effects on cell replication and differentiation, which derive, in part, from alterations in the reception of trophic neural signals. (Copyright (c) 1989 Alan R. Liss, Inc.)
||Pub. in Teratology, v40 p433-438 Nov 89. Sponsored by Health Effects Research Lab., Research Triangle Park, NC.
|NTIS Title Notes
||Reprint: Prenatal Dexamethasone Administration Disrupts the Pattern of Cellular Development in Rat Lung.
||PC A02/MF A01