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Glucocorticoids regulate the CCSP and CYP2B1 promoters via C/EBPbeta and delta in lung cells. | LitMetric
Glucocorticoids have several important roles in the lung and play a key role in lung development and maturation. However, the specific molecular mechanisms of glucocorticoid action in lung are unclear. In this study, we have investigated two glucocorticoid-regulated genes expressed in the lung epithelium, the secretory protein CCSP, and the P450-enzyme CYP2B1. In transient transfections of lung epithelial cells, glucocorticoids increased expression from the CCSP and CYP2B1 promoters and we demonstrated that induction was dependent on the integrity of C/EBP-binding sites in both promoters. Electrophoretic mobility shift assays revealed increased DNA-binding of C/EBPbeta and C/EBPdelta after glucocorticoid treatment, which was not correlated to altered protein levels. The results of this study indicate a previously unknown role for C/EBP transcription factors in glucocorticoid signaling in the lung epithelium.
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