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Retinoid regulation of human cathepsin D gene expression

Retinoid regulation of human cathepsin D gene expression

Journal of Steroid Biochemistry & Molecular Biology 57(5-6): 283-291

Retinoic acid (RA) regulation of human cathepsin D (cath D) gene expression was investigated in this study. RA enhanced cath D mRNA levels in a concentration-dependent manner in MCF-7 human breast carcinoma cells. RA regulation of cath D mRNA levels was predominantly transcriptional because RA also increased cath D gene core promoter activity. Upon further characterization of the core promoter we localized RA responsive region to proximal 112-bp. The proximal 112-bp region of cath D gene promoter harbours several retinoid response element (RARE)-like sequences. In gel shift experiments the sequence between -100 and -74 nucleotides in the CD112 region carrying imperfect direct repeat and a palindrome competed with RARE for binding to RAR/RXRs. These sequences, however, exhibited binding to protein complexes which could not be competed with unlabeled RARE or up-shifted with RAR/RXR-specific antibodies. We conclude that RA predominantly regulates cath D gene expression from the proximal 112-bp of the promoter region, but this regulation appears indirect.

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Accession: 009353683

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PMID: 8639464

DOI: 10.1016/0960-0760(95)00267-7

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