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Molecular Pharmacology

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Abstract

Rat 17 beta-hydroxysteroid dehydrogenase type IV is a novel peroxisome proliferator-inducible gene.

J C Corton, C Bocos, E S Moreno, A Merritt, D S Marsman, P J Sausen, R C Cattley and J A Gustafsson
Molecular Pharmacology November 1996, 50 (5) 1157-1166;
J C Corton
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C Bocos
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E S Moreno
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A Merritt
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D S Marsman
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P J Sausen
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R C Cattley
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J A Gustafsson
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Abstract

To better understand the molecular mechanisms of the pleiotropic responses induced by exposure to peroxisome proliferator chemicals (PPCs), we conducted a systematic search for genes whose mRNA levels are modulated by the PPC WY-14,643 (WY) in rat liver. The sequence of one up-regulated cDNA (2480 bp) was predicted to encode a protein of 735 aa with 82% identity to the porcine 17 beta-hydroxysteroid dehydrogenase type IV (HSD IV). Like the porcine enzyme, the rat HSD IV contains' a region homologous to yeast hydratase-dehydrogenase-epimerases and to sterol carrier proteins, indicating that the rat HSD IV has broad substrate specificity and contributes to cholesterol metabolism. The rat HSD IV was regulated by diverse PPCs via two distinct mechanisms. Induction of HSD IV and acyl-CoA oxidase (ACO) proteins in rat liver at different treatment times and concentrations of gemfibrozil and di-n-butyl phthalate were almost identical, indicating that HSD IV mRNA induction involves the peroxisome proliferator-activated receptor alpha, a regulator of ACO. In contrast, HSD IV protein levels were only weakly induced by WY, a strong inducer of ACO protein, even though the levels of HSD IV and ACO mRNA were strongly stimulated by WY and gemfibrozil. Thus, HSD IV protein levels were uniquely regulated pretranslationally by WY via a novel mechanism. Increased conversion of estradiol to the less-active estrone by HSD IV induction may explain how phthalate exposure leads to decreases in serum estradiol levels and suppression of ovulation.

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Molecular Pharmacology
Vol. 50, Issue 5
1 Nov 1996
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Abstract

Rat 17 beta-hydroxysteroid dehydrogenase type IV is a novel peroxisome proliferator-inducible gene.

J C Corton, C Bocos, E S Moreno, A Merritt, D S Marsman, P J Sausen, R C Cattley and J A Gustafsson
Molecular Pharmacology November 1, 1996, 50 (5) 1157-1166;

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Abstract

Rat 17 beta-hydroxysteroid dehydrogenase type IV is a novel peroxisome proliferator-inducible gene.

J C Corton, C Bocos, E S Moreno, A Merritt, D S Marsman, P J Sausen, R C Cattley and J A Gustafsson
Molecular Pharmacology November 1, 1996, 50 (5) 1157-1166;
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