Characterization of two cis-acting DNA elements involved in the androgen regulation of the probasin gene

Molecular Endocrinology
P S RennieB S MacDonald

Abstract

The location and sequence of androgen responsive elements (AREs) in the 5'-flanking DNA of the androgen-regulated rat probasin (PB) gene were determined. The DNA- and steroid-binding domains of the rat androgen receptor [glutathione-S-transferase (GST)-AR1] and the DNA-binding domain and hinge region alone (GST-AR2) were expressed in Escherichia coli as isopropyl-B-D-thioglactopyranoside-induced fusion proteins with GST and purified using glutathione affinity chromatography. Band shift assays indicated that the AR1 peptide was at least five times more effective than AR2 in binding to PB 5'-flanking DNA (-426 to +28), although both gave qualitatively similar patterns and were displaced by anti-AR antibodies. DNase I footprinting experiments revealed two putative AREs: one between positions -236 and -223 (ARE-1) and the other between -140 and -117 (ARE-2). Hormonal regulation of PB was determined by cotransfecting reporter constructions containing the PB 5'-flanking region (-426 to +28) linked to the bacterial chloramphenicol acetyl transferase (CAT) gene with androgen, glucocorticoid, or progesterone receptor expression vectors into human prostatic carcinoma cells (PC-3). PB-CAT gene expression was more effectively induced by an...Continue Reading

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