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Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039
Retinoids are known to play important roles in
organ development of the lung. Retinoids exert their activity by
modulating the expression of numerous genes, generally influencing gene
transcription, in target cells. In the present work, the mechanism by
which retinoic acid (RA) regulates surfactant protein (SP) B expression
was assessed in vitro. RA (9-cis-RA)
enhanced SP-B mRNA in pulmonary adenocarcinoma cells (H441 cells) and
increased transcriptional activity of the SP-B promoter in both H441
and mouse lung epithelial cells (MLE-15). Cotransfection of H441 cells
with retinoid nuclear receptor (RAR)-
, -
, and -
and retinoid X receptor (RXR)-
further increased the response of the
SP-B promoter to RA. Treatment of H441 cells with RA increased
immunostaining for the SP-B proprotein and increased the
number of cells in which the SP-B proprotein was detected. An RA
responsive element mediating RA stimulation of the human SP-B promoter
was identified. RAR-
and -
and RXR-
but not RAR-
or RXR-
and -
were detected by immunohistochemical analysis of H441 cells.
RA, by activating RAR activity, stimulated the transcription and
synthesis of SP-B in pulmonary adenocarcinoma cells.
surfactant protein B; glucocorticoid receptor; thyroid transcription factor-1
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