A retinoic acid-responsive element is present in the 5' flanking region of the laminin B1 gene (original) (raw)

Abstract

The retinoic acid (RA)-associated differentiation of murine F9 teratocarcinoma stem cells results in dramatic changes in gene expression. The cellular gene encoding the B1 subunit of the extracellular matrix protein laminin is transcriptionally activated by RA, and its transcription is further enhanced by N6,O2'-dibutyryladenosine 3',5'-cyclic monophosphate (Bt2cAMP) during the differentiation of F9 stem cells into extraembryonic parietal endoderm cells. We now report that expression vectors encoding the human RA receptors RAR-alpha, RAR-beta, and RAR-gamma can activate chloramphenicol acetyltransferase (CAT) expression from laminin B1 promoter/CAT expression vectors (e.g., p1.6LAMCAT) in RA-treated F9 cells, as measured in a transient transfection assay. Bt2cAMP does not further enhance the RA-associated increase in CAT activity. Through the use of deletion and mutation analyses, the RA-responsive element (RARE) of the murine laminin B1 gene has been defined as a 46-base-pair element between -477 and -432 of the laminin B1 5' flanking region. Insertion of a region of DNA containing this RARE in either orientation into a thymidine kinase promoter/CAT expression vector causes CAT expression to be activated 5- to 9-fold by the cotransfected human RAR-alpha or RAR-beta constructs in RA-treated F9 cells, and this RARE also functions in human HeLa cells. In contrast, this RARE in the p1.6LAMCAT vector does not activate CAT expression when cotransfected into F9 stem cells with the c-erbA gene in the presence of thyroid hormone. This suggests that the laminin B1 gene is activated by RA but not by thyroid hormone in vivo.

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