Transcriptional regulation of rat cytochrome P450c17 expression in mouse Leydig MA-10 and adrenal Y-1 cells: identification of a single protein that mediates both basal and cAMP-induced activities

Cytochrome P450c17, 17 alpha-hydroxylase/17,20 lyase, is a key enzyme in the steroidogenic pathway leading to the production of corticosteroids and androgens from the adrenal gland and sex steroids from the gonads. Both enzymatic activities of the protein are encoded by a single gene, CYP17, which i...

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Veröffentlicht in:DNA and cell biology 1994-11, Vol.13 (11), p.1087-1098
Hauptverfasser: Givens, C R, Zhang, P, Bair, S R, Mellon, S H
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creator Givens, C R
Zhang, P
Bair, S R
Mellon, S H
description Cytochrome P450c17, 17 alpha-hydroxylase/17,20 lyase, is a key enzyme in the steroidogenic pathway leading to the production of corticosteroids and androgens from the adrenal gland and sex steroids from the gonads. Both enzymatic activities of the protein are encoded by a single gene, CYP17, which is expressed in both the human adrenal and gonad but not in the placenta, and in the rodent gonad and placenta but not the rodent adrenal. We isolated and sequenced a full-length rat genomic clone (7,553 bases) containing the entire coding region of the rat P450c17 gene, and all intronic sequences and 1,560 bp of 5'-flanking DNA (EMBL Acc#X69816). To determine which sequences in the rat P450c17 promoter may be responsible for basal and cAMP-stimulated gene transcription, deletion constructs containing between -1,560 and -53 base pairs of 5'-flanking DNA from the rat P450c17 gene were ligated to plasmids expressing the reporter gene luciferase and transfected into two mouse cell lines, adrenal Y-1 cells, and testicular Leydig MA-10 cells. Highest basal and cAMP-stimulated luciferase activity were found in constructions containing 156 bp of 5'-flanking DNA. This construction contains a sequence very similar to the consensus cis element reported to be responsible for cAMP enhancement of the rat somatostatin gene and also overlaps a sequence similar to the consensus element for the orphan steroid receptor SF-1. Gel mobility-shift analysis, using a 30-bp oligonucleotide containing this region incubated with cellular extracts from cultured mouse adrenal Y-1 and mouse Leydig MA-10 cells, revealed all the extracts to contain two proteins that bind to this sequence. Neither DNA-protein complex was further retarded by co-incubation with an anti-CREB antibody, suggesting that cAMP regulation of this gene occurs via a non-CREB protein. Mutation of this oligonucleotide resulted in loss of binding of only one of these proteins, but resulted in loss of both basal and cAMP stimulation of rat P450c17 promoter-regulated gene transcription. Southwestern analysis suggests that one of these proteins is larger than SF-1. This study suggests that a protein that binds to an SF-1 like sequence regulates both basal and cAMP-stimulated rat P450c17 gene expression in rodent cells.
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Both enzymatic activities of the protein are encoded by a single gene, CYP17, which is expressed in both the human adrenal and gonad but not in the placenta, and in the rodent gonad and placenta but not the rodent adrenal. We isolated and sequenced a full-length rat genomic clone (7,553 bases) containing the entire coding region of the rat P450c17 gene, and all intronic sequences and 1,560 bp of 5'-flanking DNA (EMBL Acc#X69816). To determine which sequences in the rat P450c17 promoter may be responsible for basal and cAMP-stimulated gene transcription, deletion constructs containing between -1,560 and -53 base pairs of 5'-flanking DNA from the rat P450c17 gene were ligated to plasmids expressing the reporter gene luciferase and transfected into two mouse cell lines, adrenal Y-1 cells, and testicular Leydig MA-10 cells. Highest basal and cAMP-stimulated luciferase activity were found in constructions containing 156 bp of 5'-flanking DNA. This construction contains a sequence very similar to the consensus cis element reported to be responsible for cAMP enhancement of the rat somatostatin gene and also overlaps a sequence similar to the consensus element for the orphan steroid receptor SF-1. Gel mobility-shift analysis, using a 30-bp oligonucleotide containing this region incubated with cellular extracts from cultured mouse adrenal Y-1 and mouse Leydig MA-10 cells, revealed all the extracts to contain two proteins that bind to this sequence. Neither DNA-protein complex was further retarded by co-incubation with an anti-CREB antibody, suggesting that cAMP regulation of this gene occurs via a non-CREB protein. Mutation of this oligonucleotide resulted in loss of binding of only one of these proteins, but resulted in loss of both basal and cAMP stimulation of rat P450c17 promoter-regulated gene transcription. Southwestern analysis suggests that one of these proteins is larger than SF-1. 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Both enzymatic activities of the protein are encoded by a single gene, CYP17, which is expressed in both the human adrenal and gonad but not in the placenta, and in the rodent gonad and placenta but not the rodent adrenal. We isolated and sequenced a full-length rat genomic clone (7,553 bases) containing the entire coding region of the rat P450c17 gene, and all intronic sequences and 1,560 bp of 5'-flanking DNA (EMBL Acc#X69816). To determine which sequences in the rat P450c17 promoter may be responsible for basal and cAMP-stimulated gene transcription, deletion constructs containing between -1,560 and -53 base pairs of 5'-flanking DNA from the rat P450c17 gene were ligated to plasmids expressing the reporter gene luciferase and transfected into two mouse cell lines, adrenal Y-1 cells, and testicular Leydig MA-10 cells. Highest basal and cAMP-stimulated luciferase activity were found in constructions containing 156 bp of 5'-flanking DNA. This construction contains a sequence very similar to the consensus cis element reported to be responsible for cAMP enhancement of the rat somatostatin gene and also overlaps a sequence similar to the consensus element for the orphan steroid receptor SF-1. Gel mobility-shift analysis, using a 30-bp oligonucleotide containing this region incubated with cellular extracts from cultured mouse adrenal Y-1 and mouse Leydig MA-10 cells, revealed all the extracts to contain two proteins that bind to this sequence. Neither DNA-protein complex was further retarded by co-incubation with an anti-CREB antibody, suggesting that cAMP regulation of this gene occurs via a non-CREB protein. Mutation of this oligonucleotide resulted in loss of binding of only one of these proteins, but resulted in loss of both basal and cAMP stimulation of rat P450c17 promoter-regulated gene transcription. Southwestern analysis suggests that one of these proteins is larger than SF-1. 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Zhang, P ; Bair, S R ; Mellon, S H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c325t-cff87134b8623ec12776abe08f5882b27f826d367698fa4f0ffb22175fb261e43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>Adrenal Glands</topic><topic>Aldehyde-Lyases - biosynthesis</topic><topic>Aldehyde-Lyases - genetics</topic><topic>Amino Acid Sequence</topic><topic>Animals</topic><topic>Base Sequence</topic><topic>Cell Line</topic><topic>Cyclic AMP - metabolism</topic><topic>Cytochrome P-450 Enzyme System - biosynthesis</topic><topic>Cytochrome P-450 Enzyme System - genetics</topic><topic>Female</topic><topic>Gene Expression Regulation, Enzymologic</topic><topic>Genomic Library</topic><topic>Humans</topic><topic>Introns</topic><topic>Leydig Cells</topic><topic>Liver - enzymology</topic><topic>Luciferases - biosynthesis</topic><topic>Male</topic><topic>Mice</topic><topic>Molecular Sequence Data</topic><topic>Mutagenesis</topic><topic>Oligodeoxyribonucleotides</topic><topic>Placenta - metabolism</topic><topic>Pregnancy</topic><topic>Rats</topic><topic>Rats, Sprague-Dawley</topic><topic>Recombinant Proteins - biosynthesis</topic><topic>Steroid 17-alpha-Hydroxylase</topic><topic>Transcription, Genetic</topic><topic>Transfection</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Givens, C R</creatorcontrib><creatorcontrib>Zhang, P</creatorcontrib><creatorcontrib>Bair, S R</creatorcontrib><creatorcontrib>Mellon, S H</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Nucleic Acids Abstracts</collection><jtitle>DNA and cell biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Givens, C R</au><au>Zhang, P</au><au>Bair, S R</au><au>Mellon, S H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Transcriptional regulation of rat cytochrome P450c17 expression in mouse Leydig MA-10 and adrenal Y-1 cells: identification of a single protein that mediates both basal and cAMP-induced activities</atitle><jtitle>DNA and cell biology</jtitle><addtitle>DNA Cell Biol</addtitle><date>1994-11-01</date><risdate>1994</risdate><volume>13</volume><issue>11</issue><spage>1087</spage><epage>1098</epage><pages>1087-1098</pages><issn>1044-5498</issn><eissn>1557-7430</eissn><abstract>Cytochrome P450c17, 17 alpha-hydroxylase/17,20 lyase, is a key enzyme in the steroidogenic pathway leading to the production of corticosteroids and androgens from the adrenal gland and sex steroids from the gonads. Both enzymatic activities of the protein are encoded by a single gene, CYP17, which is expressed in both the human adrenal and gonad but not in the placenta, and in the rodent gonad and placenta but not the rodent adrenal. We isolated and sequenced a full-length rat genomic clone (7,553 bases) containing the entire coding region of the rat P450c17 gene, and all intronic sequences and 1,560 bp of 5'-flanking DNA (EMBL Acc#X69816). To determine which sequences in the rat P450c17 promoter may be responsible for basal and cAMP-stimulated gene transcription, deletion constructs containing between -1,560 and -53 base pairs of 5'-flanking DNA from the rat P450c17 gene were ligated to plasmids expressing the reporter gene luciferase and transfected into two mouse cell lines, adrenal Y-1 cells, and testicular Leydig MA-10 cells. Highest basal and cAMP-stimulated luciferase activity were found in constructions containing 156 bp of 5'-flanking DNA. This construction contains a sequence very similar to the consensus cis element reported to be responsible for cAMP enhancement of the rat somatostatin gene and also overlaps a sequence similar to the consensus element for the orphan steroid receptor SF-1. Gel mobility-shift analysis, using a 30-bp oligonucleotide containing this region incubated with cellular extracts from cultured mouse adrenal Y-1 and mouse Leydig MA-10 cells, revealed all the extracts to contain two proteins that bind to this sequence. Neither DNA-protein complex was further retarded by co-incubation with an anti-CREB antibody, suggesting that cAMP regulation of this gene occurs via a non-CREB protein. Mutation of this oligonucleotide resulted in loss of binding of only one of these proteins, but resulted in loss of both basal and cAMP stimulation of rat P450c17 promoter-regulated gene transcription. Southwestern analysis suggests that one of these proteins is larger than SF-1. This study suggests that a protein that binds to an SF-1 like sequence regulates both basal and cAMP-stimulated rat P450c17 gene expression in rodent cells.</abstract><cop>United States</cop><pmid>7702752</pmid><doi>10.1089/dna.1994.13.1087</doi><tpages>12</tpages></addata></record>
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ispartof DNA and cell biology, 1994-11, Vol.13 (11), p.1087-1098
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source Mary Ann Liebert Online Subscription; MEDLINE
subjects Adrenal Glands
Aldehyde-Lyases - biosynthesis
Aldehyde-Lyases - genetics
Amino Acid Sequence
Animals
Base Sequence
Cell Line
Cyclic AMP - metabolism
Cytochrome P-450 Enzyme System - biosynthesis
Cytochrome P-450 Enzyme System - genetics
Female
Gene Expression Regulation, Enzymologic
Genomic Library
Humans
Introns
Leydig Cells
Liver - enzymology
Luciferases - biosynthesis
Male
Mice
Molecular Sequence Data
Mutagenesis
Oligodeoxyribonucleotides
Placenta - metabolism
Pregnancy
Rats
Rats, Sprague-Dawley
Recombinant Proteins - biosynthesis
Steroid 17-alpha-Hydroxylase
Transcription, Genetic
Transfection
title Transcriptional regulation of rat cytochrome P450c17 expression in mouse Leydig MA-10 and adrenal Y-1 cells: identification of a single protein that mediates both basal and cAMP-induced activities
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