Abstract
Somatostatin is a regulatory peptide with important inhibitory functions. Its effects are mediated by five receptors, sst1–sst5. Previous studies revealed that sst2 contains three alternative, tissue specific promoters. Here, molecular mechanisms for the regulation of sst2 transcription by glucocorticoids were investigated. Reporter gene assays in NG 108-15 cells and electrophoretic mobility shift assays revealed that a glucocorticoid responsive element at position −1044 on the second promoter mediates dexamethasone induction. These findings, the existence of a cAMP response element and the tissue dependent activity (brain, pituitary and gastrointestinal tissues) indicate the importance of the second sst2 gene promoter.
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