Abstract
Human renal cell carcinoma is characterized by the loss of differentiation markers such as glutathione S-transferase alpha (GST-alpha). In this paper we show that the promoter of a GST-alpha gene contains a functional binding site for the cell-specific transcription factor LFB1 (HNF1). To investigate the potential role of LFB1 in the down-regulation of GST-alpha expression, we have compared the amount and the binding activity of the LFB1 protein between normal kidney and tumor tissue. By Western analysis and gel retardation assay using a monoclonal antibody specific for LFB1 we show that in 11 of 14 carcinomas the amount of LFB1 is clearly reduced compared to the corresponding normal tissue and that in all 14 renal carcinomas LFB1 binding activity is diminished. As in the same samples the abundance of GST-alpha mRNA is lower than in the normal tissue, we postulate that the loss of LFB1 binding activity might be responsible for the decreased expression of the GST-alpha gene in renal cell carcinoma.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Antibodies, Monoclonal
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Antibody Specificity
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Base Sequence
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Binding Sites
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Carcinoma, Renal Cell / enzymology
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Carcinoma, Renal Cell / genetics*
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Carcinoma, Renal Cell / metabolism*
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / physiology
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Glutathione Transferase / genetics*
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Glutathione Transferase / metabolism*
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Hepatocyte Nuclear Factor 1
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Hepatocyte Nuclear Factor 1-alpha
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Hepatocyte Nuclear Factor 1-beta
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Humans
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Kidney / metabolism
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Kidney / physiology
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Kidney Neoplasms / enzymology
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Kidney Neoplasms / genetics*
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Kidney Neoplasms / metabolism*
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Molecular Sequence Data
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Nuclear Proteins*
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Promoter Regions, Genetic / genetics
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Promoter Regions, Genetic / physiology
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RNA, Messenger / metabolism*
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Transcription Factors / genetics
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Transcription Factors / metabolism*
Substances
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Antibodies, Monoclonal
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DNA-Binding Proteins
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HNF1A protein, human
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HNF1B protein, human
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Hepatocyte Nuclear Factor 1-alpha
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Nuclear Proteins
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RNA, Messenger
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Transcription Factors
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Hepatocyte Nuclear Factor 1
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Hepatocyte Nuclear Factor 1-beta
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Glutathione Transferase