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Tai Y, Han D, Yang X, Cai G, Li H, Zhang Y, Li J, Deng X. In vitro culture and tissue-derived specific expression of melanocytes from ovary of adult Silky Fowl. Poult Sci 2024; 103:103379. [PMID: 38306917 PMCID: PMC10847685 DOI: 10.1016/j.psj.2023.103379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/10/2023] [Accepted: 12/12/2023] [Indexed: 02/04/2024] Open
Abstract
The presence of a significant number of melanocytes in the ovary and follicular membrane of Silky Fowl suggests their potential involvement in follicle development. Currently, there is a lack of available data regarding to the isolation of primary melanocytes from adult chickens. To date, primary melanocytes and their in vitro culture system have been successfully conducted in the peritoneum of chicken embryos. Herein, melanocytes from silky fowl ovaries were isolated and identified. Silky Fowl ovaries were obtained by mixed digestion of 0.1% collagenase II and 0.25% trypsin-EDTA. Melanocytes could be further purified and cultured up to 5 generations in vitro. RNA-seq analysis was used to investigate whether there were differences in the functional status of melanocytes in different tissues and developmental stages. Consequently, differential gene expressions between peritoneal and ovarian melanocytes were compared. These findings demonstrated that the Silky Fowl ovary had higher expression levels of genes involved in the production of sexual hormones and melanogenesis, while those of melanocytes derived from the peritoneum were involved in amino acid metabolism, lipid synthesis, and overall metabolic rates. This suggests that the role of melanocytes is dependent on the origin tissue and developmental stage, and is tightly connected to the function of the specific source tissue from which the cells were derived. This study provides a method for isolating adult melanocytes and serve as a basis for further investigate the effect of SFOM on germ cells.
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Affiliation(s)
- Yurong Tai
- Hainan Sanya Research Institute, Seed Laboratory & Sanya Research Institute, Hainan, China; State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Deping Han
- Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences in Weifang, Shandong 261325, China
| | - Xue Yang
- State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Ganxian Cai
- State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - HuaiYu Li
- State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Yuanyuan Zhang
- State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Junying Li
- State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Xuemei Deng
- Hainan Sanya Research Institute, Seed Laboratory & Sanya Research Institute, Hainan, China; State Key Laboratory of Animal Biotech Breeding, Breeding and Reproduction of the Ministry of Agriculture & National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China.
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Luo Z, Li M, Yang J, Li J, Zhang Y, Liu F, El-Omar E, Han L, Bian J, Gong L, Wang M. Ferulic acid attenuates high-fat diet-induced hypercholesterolemia by activating classic bile acid synthesis pathway. Front Nutr 2022; 9:976638. [PMID: 36211528 PMCID: PMC9536491 DOI: 10.3389/fnut.2022.976638] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 08/30/2022] [Indexed: 12/03/2022] Open
Abstract
Ferulic acid (FA), a natural phenolic phytochemical abundantly present in whole grains, displays promising therapeutic effects on hypercholesterolemia while its underlying mechanism not fully elucidated. This study aimed to investigate the cholesterol-lowering effect of FA in high-fat diet (HFD)-fed mice and its potential molecular mechanism. FA supplementation alleviated HFD-induced hypercholesterolemia (–13.2%, p < 0.05), along with increased excretion of bile acids (BAs) in feces (37.0%, p < 0.05). Mechanism studies showed that FA activated the expression of cholesterol 7α hydroxylase (CYP7A1), a rate-limiting enzyme in BA biosynthesis in the liver, which increased the BAs biosynthesis from cholesterol. Surprisingly, increased excretion of BAs in feces is a consequence, not a cause, of CYP7A1 activation. Furthermore, enterohepatic farnesoid X receptor (FXR) signaling is not involved in the activation of hepatic CYP7A1 by FA. In conclusion, FA activates CYP7A1 through non-FXR signaling, which on the one hand effectively prevents hypercholesterolemia, and on the other hand leads to secondary BAs elevation in plasma. The latter may be the key to the anti-obesity and hypoglycemic effects of FA.
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Affiliation(s)
- Zhixin Luo
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Mengqian Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Jiachuan Yang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Jia Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yao Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Fang Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Emad El-Omar
- Microbiome Research Centre, St George and Sutherland Clinical School, University of New South Wales, Sydney, NSW, Australia
| | - Lin Han
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- *Correspondence: Lin Han,
| | - Ji Bian
- Kolling Institute, Sydney Medical School, Faculty of Medicine and Health, University of Sydney, Royal North Shore Hospital, St Leonards, NSW, Australia
- Ji Bian,
| | - Lan Gong
- Microbiome Research Centre, St George and Sutherland Clinical School, University of New South Wales, Sydney, NSW, Australia
- Lan Gong,
| | - Min Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Min Wang,
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3
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Chiang JY, Ferrell JM. Up to date on cholesterol 7 alpha-hydroxylase (CYP7A1) in bile acid synthesis. LIVER RESEARCH 2020; 4:47-63. [PMID: 34290896 PMCID: PMC8291349 DOI: 10.1016/j.livres.2020.05.001] [Citation(s) in RCA: 116] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Cholesterol 7 alpha-hydroxylase (CYP7A1, EC1.14) is the first and rate-limiting enzyme in the classic bile acid synthesis pathway. Much progress has been made in understanding the transcriptional regulation of CYP7A1 gene expression and the underlying molecular mechanisms of bile acid feedback regulation of CYP7A1 and bile acid synthesis in the last three decades. Discovery of bile acid-activated receptors and their roles in the regulation of lipid, glucose and energy metabolism have been translated to the development of bile acid-based drug therapies for the treatment of liver-related metabolic diseases such as alcoholic and non-alcoholic fatty liver diseases, liver cirrhosis, diabetes, obesity and hepatocellular carcinoma. This review will provide an update on the advances in our understanding of the molecular biology and mechanistic insights of the regulation of CYP7A1 in bile acid synthesis in the last 40 years.
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Kakiyama G, Marques D, Takei H, Nittono H, Erickson S, Fuchs M, Rodriguez-Agudo D, Gil G, Hylemon PB, Zhou H, Bajaj JS, Pandak WM. Mitochondrial oxysterol biosynthetic pathway gives evidence for CYP7B1 as controller of regulatory oxysterols. J Steroid Biochem Mol Biol 2019; 189:36-47. [PMID: 30710743 DOI: 10.1016/j.jsbmb.2019.01.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 01/17/2019] [Accepted: 01/22/2019] [Indexed: 12/13/2022]
Abstract
The aim of this paper was to more completely study the mitochondrial CYP27A1 initiated acidic pathway of cholesterol metabolism. The mitochondrial CYP27A1 initiated pathway of cholesterol metabolism (acidic pathway) is known to synthesize two well-described vital regulators of cholesterol/lipid homeostasis, (25R)-26-hydroxycholesterol (26HC) and 25-hydroxycholesterol (25HC). Both 26HC and 25HC have been shown to be subsequently 7α-hydroxylated by Cyp7b1; reducing their regulatory abilities and furthering their metabolism to chenodeoxycholic acid (CDCA). Cholesterol delivery into the inner mitochondria membrane, where CYP27A1 is located, is considered the pathway's only rate-limiting step. To further explore the pathway, we increased cholesterol transport into mitochondrial CYP27A1 by selectively increased expression of the gene encoding the steroidogenic acute transport protein (StarD1). StarD1 overexpression led to an unanticipated marked down-regulation of oxysterol 7α-hydroxylase (Cyp7b1), a marked increase in 26HC, and the formation of a third vital regulatory oxysterol, 24(S)-hydroxycholesterol (24HC), in B6/129 mice livers. To explore the further metabolism of 24HC, as well as, 25HC and 26HC, characterizations of oxysterols and bile acids using three murine models (StarD1 overexpression, Cyp7b1-/-, Cyp27a1-/-) and human Hep G2 cells were conducted. This report describes the discovery of a new mitochondrial-initiated pathway of oxysterol/bile acid biosynthesis. Just as importantly, it provides evidence for CYP7B1 as a key regulator of three vital intracellular regulatory oxysterol levels.
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Affiliation(s)
- Genta Kakiyama
- Department of Internal Medicine, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States.
| | - Dalila Marques
- Department of Internal Medicine, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
| | - Hajime Takei
- Junshin Clinic Bile Acid Institute, Tokyo, Japan
| | | | - Sandra Erickson
- School of Medicine, University of California, San Francisco, United States
| | - Michael Fuchs
- Department of Internal Medicine, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
| | - Daniel Rodriguez-Agudo
- Department of Internal Medicine, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
| | - Gregorio Gil
- Department of Biochemistry & Molecular Biology, Virginia Commonwealth University, United States
| | - Phillip B Hylemon
- Department of Microbiology and Immunology, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
| | - Huiping Zhou
- Department of Microbiology and Immunology, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
| | - Jasmohan S Bajaj
- Department of Internal Medicine, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
| | - William M Pandak
- Department of Internal Medicine, Virginia Commonwealth University, United States; Department of Veterans Affairs, Richmond, VA, United States
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Li J, Dawson PA. Animal models to study bile acid metabolism. Biochim Biophys Acta Mol Basis Dis 2018; 1865:895-911. [PMID: 29782919 DOI: 10.1016/j.bbadis.2018.05.011] [Citation(s) in RCA: 132] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/11/2018] [Accepted: 05/14/2018] [Indexed: 12/19/2022]
Abstract
The use of animal models, particularly genetically modified mice, continues to play a critical role in studying the relationship between bile acid metabolism and human liver disease. Over the past 20 years, these studies have been instrumental in elucidating the major pathways responsible for bile acid biosynthesis and enterohepatic cycling, and the molecular mechanisms regulating those pathways. This work also revealed bile acid differences between species, particularly in the composition, physicochemical properties, and signaling potential of the bile acid pool. These species differences may limit the ability to translate findings regarding bile acid-related disease processes from mice to humans. In this review, we focus primarily on mouse models and also briefly discuss dietary or surgical models commonly used to study the basic mechanisms underlying bile acid metabolism. Important phenotypic species differences in bile acid metabolism between mice and humans are highlighted.
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Affiliation(s)
- Jianing Li
- Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition, Emory University, Atlanta, GA 30322, United States
| | - Paul A Dawson
- Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition, Emory University, Atlanta, GA 30322, United States.
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Hill CE, Sapouckey SA, Suvorov A, Vandenberg LN. Developmental exposures to bisphenol S, a BPA replacement, alter estrogen-responsiveness of the female reproductive tract: a pilot study. COGENT MEDICINE 2017; 4:1317690. [PMID: 31231671 PMCID: PMC6588183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023] Open
Abstract
Developmental exposures to bisphenol A (BPA), an estrogen receptor agonist, can disrupt development of the female reproductive tract in rodents and non-human primates. Due to an increased public knowledge of negative health effects associated with BPA exposure, BPA has begun to be phased out of many consumer products and in some cases it has been replaced with structurally similar compounds including bisphenol S (BPS). This study examined CD-1 mice exposed to a low dose of BPS during early development (200 µg/kg/day from gestational day 8 until postnatal day 19). BPS altered expression of estrogen-responsive genes in both the uterus and ovary, and induced increases in ovarian follicular development in pre-pubertal females evaluated at postnatal day 22. Prior studies have revealed that developmental exposures to environmental chemicals including BPA alter the response of animals to hormonal or carcinogen challenges experienced later in life. To evaluate whether early life exposures to BPS alter responses of females to an estrogen challenge, additional females were exposed to ethinyl estradiol from postnatal day 19 through postnatal day 21. BPS-treated females responded abnormally to this estrogen challenge, displaying heightened responses in the uterus and diminished responses in the ovary. Although additional studies are needed to characterize the mechanisms by which BPS alters the female reproductive tract, this pilot study provides evidence that a common BPA replacement chemical may have endocrine disrupting properties.
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Affiliation(s)
- Corinne E. Hill
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts - Amherst
| | - Sarah A. Sapouckey
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts - Amherst
| | - Alexander Suvorov
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts - Amherst
| | - Laura N. Vandenberg
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts - Amherst
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Hill CE, Sapouckey SA, Suvorov A, Vandenberg LN. Developmental exposures to bisphenol S, a BPA replacement, alter estrogen-responsiveness of the female reproductive tract: A pilot study. COGENT MEDICINE 2017. [DOI: 10.1080/2331205x.2017.1317690] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- Corinne E. Hill
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts – Amherst, 171A Goessmann, 686 N. Pleasant Street, Amherst, MA 01003, USA
| | - Sarah A. Sapouckey
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts – Amherst, 171A Goessmann, 686 N. Pleasant Street, Amherst, MA 01003, USA
| | - Alexander Suvorov
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts – Amherst, 171A Goessmann, 686 N. Pleasant Street, Amherst, MA 01003, USA
| | - Laura N. Vandenberg
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts – Amherst, 171A Goessmann, 686 N. Pleasant Street, Amherst, MA 01003, USA
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8
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Rempel LA, Rohrer GA, Nonneman DJ. Genomics and metabolomics of post-weaning return to estrus. Mol Reprod Dev 2017; 84:987-993. [PMID: 28436551 DOI: 10.1002/mrd.22820] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 04/21/2017] [Indexed: 11/10/2022]
Abstract
The weaning-to-estrus interval is a multifaceted trait that has the potential to substantially improve production efficiency in today's global swine industry, if variation in this measure can be reduced. Systems-biology approaches should help close the knowledge gap and increase selection tools and management strategies-such as gilt development programs, farrowing, and lactation feeding programs-to decrease the weaning-to-estrus interval. Metabolomics, the study of small compounds within biofluids and tissues, provides links between genotype and phenotype. Given the complexity and influence of the environment on the weaning-to-estrus interval, incorporating metabolomics data will provide valuable insight and guidance for future physiological as well as genetic and genomic strategies to reduce this interval, thereby improving sow productivity.
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Affiliation(s)
- Lea A Rempel
- United States Department of Agriculture, Agricultural Research Service, U.S., Meat Animal Research Center, Clay Center, Nebraska
| | - Gary A Rohrer
- United States Department of Agriculture, Agricultural Research Service, U.S., Meat Animal Research Center, Clay Center, Nebraska
| | - Danny J Nonneman
- United States Department of Agriculture, Agricultural Research Service, U.S., Meat Animal Research Center, Clay Center, Nebraska
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Cheung TT, Weston MK, Wilson MJ. Selection and evaluation of reference genes for analysis of mouse (Mus musculus) sex-dimorphic brain development. PeerJ 2017; 5:e2909. [PMID: 28133578 PMCID: PMC5251938 DOI: 10.7717/peerj.2909] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 12/08/2016] [Indexed: 11/24/2022] Open
Abstract
The development of the brain is sex-dimorphic, and as a result so are many neurological disorders. One approach for studying sex-dimorphic brain development is to measure gene expression in biological samples using RT-qPCR. However, the accuracy and consistency of this technique relies on the reference gene(s) selected. We analyzed the expression of ten reference genes in male and female samples over three stages of brain development, using popular algorithms NormFinder, GeNorm and Bestkeeper. The top ranked reference genes at each time point were further used to quantify gene expression of three sex-dimorphic genes (Wnt10b, Xist and CYP7B1). When comparing gene expression between the sexes expression at specific time points the best reference gene combinations are: Sdha/Pgk1 at E11.5, RpL38/Sdha E12.5, and Actb/RpL37 at E15.5. When studying expression across time, the ideal reference gene(s) differs with sex. For XY samples a combination of Actb/Sdha. In contrast, when studying gene expression across developmental stage with XX samples, Sdha/Gapdh were the top reference genes. Our results identify the best combination of two reference genes when studying male and female brain development, and emphasize the importance of selecting the correct reference genes for comparisons between developmental stages.
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Affiliation(s)
- Tanya T Cheung
- Department of Anatomy, University of Otago , Dunedin , New Zealand
| | | | - Megan J Wilson
- Department of Anatomy, University of Otago , Dunedin , New Zealand
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Abstract
Oxysterols have long been known for their important role in cholesterol homeostasis, where they are involved in both transcriptional and posttranscriptional mechanisms for controlling cholesterol levels. However, they are increasingly associated with a wide variety of other, sometimes surprising cell functions. They are activators of the Hedgehog pathway (important in embryogenesis), and they act as ligands for a growing list of receptors, including some that are of importance to the immune system. Oxysterols have also been implicated in several diseases such as neurodegenerative diseases and atherosclerosis. Here, we explore the latest research into the roles oxy-sterols play in different areas, and we evaluate the current evidence for these roles. In addition, we outline critical concepts to consider when investigating the roles of oxysterols in various situations, which includes ensuring that the concentration and form of the oxysterol are relevant in that context--a caveat with which many studies have struggled.
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Affiliation(s)
- Winnie Luu
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales 2052, Australia; , , ,
| | - Laura J Sharpe
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales 2052, Australia; , , ,
| | - Isabelle Capell-Hattam
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales 2052, Australia; , , ,
| | - Ingrid C Gelissen
- Faculty of Pharmacy, The University of Sydney, Sydney, New South Wales 2006, Australia;
| | - Andrew J Brown
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales 2052, Australia; , , ,
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Mutemberezi V, Guillemot-Legris O, Muccioli GG. Oxysterols: From cholesterol metabolites to key mediators. Prog Lipid Res 2016; 64:152-169. [PMID: 27687912 DOI: 10.1016/j.plipres.2016.09.002] [Citation(s) in RCA: 234] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/13/2016] [Accepted: 09/23/2016] [Indexed: 12/13/2022]
Abstract
Oxysterols are cholesterol metabolites that can be produced through enzymatic or radical processes. They constitute a large family of lipids (i.e. the oxysterome) involved in a plethora of physiological processes. They can act through GPCR (e.g. EBI2, SMO, CXCR2), nuclear receptors (LXR, ROR, ERα) and through transporters or regulatory proteins. Their physiological effects encompass cholesterol, lipid and glucose homeostasis. Additionally, they were shown to be involved in other processes such as immune regulatory functions and brain homeostasis. First studied as precursors of bile acids, they quickly emerged as interesting lipid mediators. Their levels are greatly altered in several pathologies and some oxysterols (e.g. 4β-hydroxycholesterol or 7α-hydroxycholestenone) are used as biomarkers of specific pathologies. In this review, we discuss the complex metabolism and molecular targets (including binding properties) of these bioactive lipids in human and mice. We also discuss the genetic mouse models currently available to interrogate their effects in pathophysiological settings. We also summarize the levels of oxysterols reported in two key organs in oxysterol metabolism (liver and brain), plasma and cerebrospinal fluid. Finally, we consider future opportunities and directions in the oxysterol field in order to gain a better insight and understanding of the complex oxysterol system.
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Affiliation(s)
- Valentin Mutemberezi
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Belgium
| | - Owein Guillemot-Legris
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Belgium
| | - Giulio G Muccioli
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Belgium.
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Šafranko ŽM, Balog T, Musa M, Bujak IT, Sobočanec S. The effect of 17β-estradiol on sex-dimorphic cytochrome P450 expression patterns induced by hyperoxia in the liver of male CBA/H mice. Mol Cell Biochem 2016; 421:183-91. [DOI: 10.1007/s11010-016-2802-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 08/25/2016] [Indexed: 10/21/2022]
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13
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Oyola MG, Zuloaga DG, Carbone D, Malysz AM, Acevedo-Rodriguez A, Handa RJ, Mani SK. CYP7B1 Enzyme Deletion Impairs Reproductive Behaviors in Male Mice. Endocrinology 2015; 156:2150-61. [PMID: 25849728 PMCID: PMC4430609 DOI: 10.1210/en.2014-1786] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In addition to androgenic properties mediated via androgen receptors, dihydrotestosterone (DHT) also regulates estrogenic functions via an alternate pathway. These estrogenic functions of DHT are mediated by its metabolite 5α-androstane-3β, 17β-diol (3β-diol) binding to estrogen receptor β (ERβ). CYP7B1 enzyme converts 3β-diol to inactive 6α- or 7α-triols and plays an important role as a regulator of estrogenic functions mediated by 3β-diol. Using a mutant mouse carrying a null mutation for the CYP7B1 gene (CYP7B1KO), we examined the contribution of CYP7B1 on physiology and behavior. Male, gonadectomized (GDX) CYP7B1KO and their wild type (WT) littermates were assessed for their behavioral phenotype, anxiety-related behavioral measures, and hypothalamic pituitary adrenal axis reactivity. No significant effects of genotype were evident in anxiety-like behaviors in open field (OFA), light-dark (L/D) exploration, and elevated plus maze (EPM). T significantly reduced open arm time on the EPM while not affecting L/D exploratory and OFA behaviors in CYP7B1KO and WT littermates. T also attenuated the corticosterone response to EPM in both genotypes. In GDX animals, T was able to reinstate male-specific reproductive behaviors (latencies and number of mounts, intromission, and ejaculations) in the WT but not in the CYP7B1KO mice. The male reproductive behavior defect in CYP7B1KO seems to be due to their inability to distinguish olfactory cues from a behavioral estrus female. CYP7B1KO mice also showed a reduction in androgen receptor mRNA expression in the olfactory bulb. Our findings suggest a novel role for the CYP7B1 enzyme in the regulation of male reproductive behaviors.
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Affiliation(s)
- Mario G Oyola
- Department of Neuroscience (M.G.O., A.A.-R., S.K.M.), Molecular & Cellular Biology (A.M.M., S.K.M.), Memory and Brain Research Center (M.G.O., A.M.M., A.A.-R., S.K.M.), Baylor College of Medicine, Houston, Texas 77030; and Department Of Basic Medical Sciences (D.G.Z., D.C., R.J.H.), University of Arizona College of Medicine, Phoenix, Arizona 85004
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14
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Lee JW, Huang JD, Rodriguez IR. Extra-hepatic metabolism of 7-ketocholesterol occurs by esterification to fatty acids via cPLA2α and SOAT1 followed by selective efflux to HDL. Biochim Biophys Acta Mol Cell Biol Lipids 2015; 1851:605-19. [PMID: 25617738 DOI: 10.1016/j.bbalip.2015.01.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 12/24/2014] [Accepted: 01/15/2015] [Indexed: 12/31/2022]
Abstract
Accumulation of 7-ketocholesterol (7KCh) in tissues has been previously associated with various chronic aging diseases. Orally ingested 7KCh is readily metabolized by the liver and does not pose a toxicity threat. However, 7KCh formed in situ, usually associated with lipoprotein deposits, can adversely affect surrounding tissues by causing inflammation and cytotoxicity. In this study we have investigated various mechanisms for extra-hepatic metabolism of 7KCh (e.g. hydroxylation, sulfation) and found only esterification to fatty acids. The esterification of 7KCh to fatty acids involves the combined action of cytosolic phospholipase A2 alpha (cPLA2α) and sterol O-acyltransferase (SOAT1). Inhibition of either one of these enzymes ablates 7KCh-fatty acid ester (7KFAE) formation. The 7KFAEs are not toxic and do not induce inflammatory responses. However, they can be unstable and re-release 7KCh. The higher the degree of unsaturation, the more unstable the 7KFAE (e.g. 18:0>18:1>18:2>18:3≫20:4). Biochemical inhibition and siRNA knockdown of SOAT1 and cPLA2α ablated the 7KFAE synthesis in cultured ARPE19 cells, but had little effect on the 7KCh-induced inflammatory response. Overexpression of SOAT1 reduced the 7KCh-induced inflammatory response and provided some protection from cell death. This effect is likely due to the increased conversion of 7KCh to 7KFAEs, which reduced the intracellular 7KCh levels. Addition of HDL selectively increased the efflux of 7KFAEs and enhanced the effect of SOAT1 overexpression. Our data suggests an additional function for HDL in aiding extra-hepatic tissues to eliminate 7KCh by returning 7KFAEs to the liver for bile acid formation.
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Affiliation(s)
- Jung Wha Lee
- Mechanisms of Retinal Diseases Section, Laboratory of Retinal Cell and Molecular Biology, National Eye Institute, National Institutes of Health, Bethesda, MD, USA.
| | - Jiahn-Dar Huang
- Mechanisms of Retinal Diseases Section, Laboratory of Retinal Cell and Molecular Biology, National Eye Institute, National Institutes of Health, Bethesda, MD, USA
| | - Ignacio R Rodriguez
- Mechanisms of Retinal Diseases Section, Laboratory of Retinal Cell and Molecular Biology, National Eye Institute, National Institutes of Health, Bethesda, MD, USA
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15
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Effects of differentn-6:n-3 fatty acid ratios and of enterolactone on gene expression and PG secretion in bovine endometrial cells. Br J Nutr 2014; 113:56-71. [DOI: 10.1017/s0007114514003304] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Feeding flaxseed to dairy cows can modulate gene expression and PG synthesis in the uterus at the time of peri-implantation. The objectives of the present study were to determine which flaxseed components are responsible for these effects and how different endometrial cell types are affected. We evaluated the effects of six different linoleic acid (n-6):α-linolenic acid (n-3) ratios and three concentrations of the lignan enterolactone (ENL) on endometrial stromal cells (SC) and epithelial cells (EC). The mRNA abundance of genes with known or suspected roles in embryo survival or PG synthesis was evaluated, along with PGE2and PGF2αconcentrations in culture media. The mRNA abundance of several genes was modulated by different fatty acid (FA) ratios and/or ENL, and this modulation differed between cell types. The FA4 (FA at ann-6:n-3 ratio of 4) treatment (rich inn-3 FA) increased the mRNA abundance of genes that have positive effects on uterine receptivity and implantation when compared with the FA25 (FA at ann-6:n-3 ratio of 25) treatment (rich inn-6 FA). ENL decreased PGE2and PGF2αconcentrations in both cell types, and this reduction was associated with lower mRNA abundance of the PG synthase genesAKR1B1andPTGESin SC. The combination of ENL with FA (FA4 treatment) resulted in the greatest reduction in PGF2αconcentrations when compared with the addition of FA (FA4) or ENL alone. Because of the known luteolytic properties of PGF2α, a reduction in endometrial PGF2αsecretion would favour the establishment and maintenance of pregnancy.
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16
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Lathe R, Kotelevtsev Y. Steroid signaling: ligand-binding promiscuity, molecular symmetry, and the need for gating. Steroids 2014; 82:14-22. [PMID: 24462647 DOI: 10.1016/j.steroids.2014.01.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 12/03/2013] [Accepted: 01/06/2014] [Indexed: 11/28/2022]
Abstract
Steroid/sterol-binding receptors and enzymes are remarkably promiscuous in the range of ligands they can bind to and, in the case of enzymes, modify - raising the question of how specific receptor activation is achieved in vivo. Estrogen receptors (ER) are modulated by 27-hydroxycholesterol and 5α-androstane-3β,17β-diol (Adiol), in addition to estradiol (E2), and respond to diverse small molecules such as bisphenol A. Steroid-modifying enzymes are also highly promiscuous in ligand binding and metabolism. The specificity problem is compounded by the fact that the steroid core (hydrogenated cyclopentophenanthrene ring system) has several planes of symmetry. Ligand binding can be in symmetrical East-West (rotation) and North-South (inversion) orientations. Hydroxysteroid dehydrogenases (HSDs) can modify symmetrical 7 and 11, also 3 and 17/20, positions, exemplified here by yeast 3α,20β-HSD and mammalian 11β-HSD and 17β-HSD enzymes. Faced with promiscuity and symmetry, other strategies are clearly necessary to promote signaling selectivity in vivo. Gating regulates hormone access via enzymes that preferentially inactivate (or activate) a subclass of ligands, thereby governing which ligands gain receptor access - exemplified by 11β-HSD gating cortisol access to the mineralocorticoid receptor, and P450 CYP7B1 gating Adiol access to ER. Counter-intuitively, the specificity of steroid/sterol action is achieved not by intrinsic binding selectivity but by the combination of local metabolism and binding affinity.
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Affiliation(s)
- Richard Lathe
- State University of Pushchino, Prospekt Nauki, Pushchino 142290, Moscow Region, Russia; Pushchino Branch of the Institute of Bio-Organic Chemistry, Russian Academy of Sciences, Pushchino 142290, Moscow Region, Russia; Pieta Research, PO Box 27069, Edinburgh EH10 5YW, UK.
| | - Yuri Kotelevtsev
- State University of Pushchino, Prospekt Nauki, Pushchino 142290, Moscow Region, Russia; Pushchino Branch of the Institute of Bio-Organic Chemistry, Russian Academy of Sciences, Pushchino 142290, Moscow Region, Russia; Biomedical Centre for Research Education and Innovation (CREI), Skolkovo Institute of Science and Technology, 143025 Skolkovo, Russia; Queens Medical Research Institute, University of Edinburgh, Little France, Edinburgh EH16 4TJ, UK.
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17
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Yantsevich AV, Dichenko YV, Mackenzie F, Mukha DV, Baranovsky AV, Gilep AA, Usanov SA, Strushkevich NV. Human steroid and oxysterol 7α-hydroxylase CYP7B1: substrate specificity, azole binding and misfolding of clinically relevant mutants. FEBS J 2014; 281:1700-13. [PMID: 24491228 DOI: 10.1111/febs.12733] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 12/23/2013] [Accepted: 01/28/2014] [Indexed: 11/28/2022]
Abstract
Oxysterols and neurosteroids are important signaling molecules produced by monooxygenases of the cytochrome P450 family that realize their effect through nuclear receptors. CYP7B1 catalyzes the 6- or 7-hydroxylation of both steroids and oxysterols and thus is involved in the metabolism of neurosteroids and bile acid synthesis, respectively. The dual physiological role of CYP7B1 is evidenced from different diseases, liver failure and progressive neuropathy, caused by enzyme malfunction. Here we present biochemical characterization of CYP7B1 at the molecular level to understand substrate specificity and susceptibility to azole drugs. Based on our experiments with purified enzyme, the requirements for CYP7B1 hydroxylation of steroid molecules are as follows: C5 hydrogen in the α-configuration (or double bond at C5), a polar group at C17, a hydroxyl group at C3, and the absence of the hydroxyl group at C20-C24 in the C27-sterol side chain. 21-hydroxy-pregnenolone was identified as a new substrate, and overall low activity toward pregnanes could be related to the increased potency of 7-hydroxy derivatives produced by CYP7B1. Metabolic conversion (deactivation) of oxysterols by CYP7B1 in a reconstituted system proceeds via two sequential hydroxylations. Two mutations that are found in patients with diseases, Gly57Arg and Phe216Ser, result in apo-P450 (devoid of heme) protein formation. Our CYP7B1 homology model provides a rationale for understanding clinical mutations and relatively broad substrate specificity for steroid hydroxylase.
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18
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Abstract
The cytochrome P450 superfamily consists of a large number of heme-containing monooxygenases. Many human P450s metabolize drugs used to treat human diseases. Others are necessary for synthesis of endogenous compounds essential for human physiology. In some instances, alterations in specific P450s affect the biological processes that they mediate and lead to a disease. In this minireview, we describe medically significant human P450s (from families 2, 4, 7, 11, 17, 19, 21, 24, 27, 46, and 51) and the diseases associated with these P450s.
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Affiliation(s)
- Irina A Pikuleva
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio 44106, USA.
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19
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Michael Miller KK, Al-Rayyan N, Ivanova MM, Mattingly KA, Ripp SL, Klinge CM, Prough RA. DHEA metabolites activate estrogen receptors alpha and beta. Steroids 2013; 78:15-25. [PMID: 23123738 PMCID: PMC3529809 DOI: 10.1016/j.steroids.2012.10.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 09/17/2012] [Accepted: 10/17/2012] [Indexed: 11/22/2022]
Abstract
Dehydroepiandrosterone (DHEA) levels were reported to associate with increased breast cancer risk in postmenopausal women, but some carcinogen-induced rat mammary tumor studies question this claim. The purpose of this study was to determine how DHEA and its metabolites affect estrogen receptors α or β (ERα or ERβ)-regulated gene transcription and cell proliferation. In transiently transfected HEK-293 cells, androstenediol, DHEA, and DHEA-S activated ERα. In ERβ transfected HepG2 cells, androstenedione, DHEA, androstenediol, and 7-oxo DHEA stimulated reporter activity. ER antagonists ICI 182,780 (fulvestrant) and 4-hydroxytamoxifen, general P450 inhibitor miconazole, and aromatase inhibitor exemestane inhibited activation by DHEA or metabolites in transfected cells. ERβ-selective antagonist R,R-THC (R,R-cis-diethyl tetrahydrochrysene) inhibited DHEA and DHEA metabolite transcriptional activity in ERβ-transfected cells. Expression of endogenous estrogen-regulated genes: pS2, progesterone receptor, cathepsin D1, and nuclear respiratory factor-1 was increased by DHEA and its metabolites in an ER-subtype, gene, and cell-specific manner. DHEA metabolites, but not DHEA, competed with 17β-estradiol for ERα and ERβ binding and stimulated MCF-7 cell proliferation, demonstrating that DHEA metabolites interact directly with ERα and ERβin vitro, modulating estrogen target genes in vivo.
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Affiliation(s)
| | | | | | | | | | - Carolyn M. Klinge
- CORRESPONDING AUTHORS: Russell A. Prough, Ph.D., and Carolyn M. Klinge. Ph.D. Department of Biochemistry & Molecular Biology, University of Louisville School of Medicine, Louisville, KY 40292. Phone: (502) 852-7249 (RAP); 502-852-3668 (CMK); FAX: (502) 852-6222; and
| | - Russell A. Prough
- CORRESPONDING AUTHORS: Russell A. Prough, Ph.D., and Carolyn M. Klinge. Ph.D. Department of Biochemistry & Molecular Biology, University of Louisville School of Medicine, Louisville, KY 40292. Phone: (502) 852-7249 (RAP); 502-852-3668 (CMK); FAX: (502) 852-6222; and
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20
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Yi T, Wang X, Kelly LM, An J, Xu Y, Sailer AW, Gustafsson JA, Russell DW, Cyster JG. Oxysterol gradient generation by lymphoid stromal cells guides activated B cell movement during humoral responses. Immunity 2012; 37:535-48. [PMID: 22999953 DOI: 10.1016/j.immuni.2012.06.015] [Citation(s) in RCA: 162] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 05/24/2012] [Accepted: 06/12/2012] [Indexed: 12/20/2022]
Abstract
7α,25-dihydroxycholesterol (7α,25-OHC) is a ligand for the G protein-coupled receptor EBI2; however, the cellular sources of this oxysterol are undefined. 7α,25-OHC is synthesized from cholesterol by the stepwise actions of two enzymes, CH25H and CYP7B1, and is metabolized to a 3-oxo derivative by HSD3B7. We showed that all three enzymes control EBI2 ligand concentration in lymphoid tissues. Lymphoid stromal cells were the main CH25H- and CYP7B1-expressing cells required for positioning of B cells, and they also mediated 7α,25-OHC inactivation. CH25H and CYP7B1 were abundant at the follicle perimeter, whereas CH25H expression by follicular dendritic cells was repressed. CYP7B1, CH25H, and HSD3B7 deficiencies each resulted in defective T cell-dependent plasma cell responses. These findings establish that CYP7B1 and HSD3B7, as well as CH25H, have essential roles in controlling oxysterol production in lymphoid tissues, and they suggest that differential enzyme expression in stromal cell subsets establishes 7α,25-OHC gradients required for B cell responses.
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Affiliation(s)
- Tangsheng Yi
- Howard Hughes Medical Institute and Department of Microbiology and Immunology, University of California, San Francisco, CA 94143, USA
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21
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Abstract
Recently, cytochrome P450 170A1 (CYP170A1) has been found to be a bifunctional protein, which catalyzes both monooxygenase activity and terpene synthase activity by two distinct active sites in the well-established P450 protein structure. Therefore, CYP170A1 is identified clearly as a moonlighting protein. The known activities of a small number of the 13,000 members of the P450 superfamily fall into two general classes: promiscuous enzymes that are not considered as moonlighting and forms that participate in biosynthesis of endogenous compounds, such as steroids, vitamins and play different roles in different tissues, sometimes being moonlighting enzymes. Here, we review examples of moonlighting P450, which add to our understanding of the large CYP superfamily.
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Affiliation(s)
- Bin Zhao
- Department of Biochemistry, Center for Structural Biology, Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
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22
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Lorbek G, Lewinska M, Rozman D. Cytochrome P450s in the synthesis of cholesterol and bile acids--from mouse models to human diseases. FEBS J 2011; 279:1516-33. [PMID: 22111624 DOI: 10.1111/j.1742-4658.2011.08432.x] [Citation(s) in RCA: 148] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The present review describes the transgenic mouse models that have been designed to evaluate the functions of the cytochrome P450s involved in cholesterol and bile acid synthesis, as well as their link with disease. The knockout of cholesterogenic Cyp51 is embrionally lethal, with symptoms of Antley-Bixler syndrome occurring in mice, whereas the evidence for this association is conflicting in humans. Disruption of Cyp7a1 from classic bile acid synthesis in mice leads to either increased postnatal death or a milder phenotype with elevated serum cholesterol. The latter is similar to the case in humans, where CYP7A1 mutations associate with high plasma low-density lipoprotein and hepatic cholesterol content, as well as deficient bile acid excretion. Disruption of Cyp8b1 from an alternative bile acid pathway results in the absence of cholic acid and a reduced absorption of dietary lipids; however, the human CYP8B1 polymorphism fails to explain differences in bile acid composition. Unexpectedly, apparently normal Cyp27a1(-/-) mice still synthesize bile acids that originate from the compensatory pathway. In humans, CYP27A1 mutations cause cerebrotendinous xanthomatosis, suggesting that only mice can compensate for the loss of alternative bile acid synthesis. In line with this, Cyp7b1 knockouts are also apparently normal, whereas human CYP7B1 mutations lead to a congenital bile acid synthesis defect in children or spastic paraplegia in adults. Mouse knockouts of the brain-specific Cyp46a1 have reduced brain cholesterol excretion, whereas, in humans, CYP46A1 polymorphisms associate with cognitive impairment. At present, cytochrome P450 family 39 is poorly characterized. Despite important physiological differences between humans and mice, mouse models prove to be an invaluable tool for understanding the multifactorial facets of cholesterol and bile acid-related disorders.
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Affiliation(s)
- Gregor Lorbek
- Center for Functional Genomics and Bio-Chips, Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
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23
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Garcia-Rudaz C, Dorfman M, Nagalla S, Svechnikov K, Söder O, Ojeda SR, Dissen GA. Excessive ovarian production of nerve growth factor elicits granulosa cell apoptosis by setting in motion a tumor necrosis factor α/stathmin-mediated death signaling pathway. Reproduction 2011; 142:319-31. [PMID: 21646391 DOI: 10.1530/rep-11-0134] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Excessive nerve growth factor (NGF) production by the ovary, achieved via a transgenic approach, results in arrested antral follicle growth, reduced ovulatory capacity, and a predisposition to cyst formation in response to mildly elevated LH levels. Two salient features in these mutant mice (termed 17NF) are an elevated production of 17α-hydroxyprogesterone (17-OHP(4)), testosterone, and estradiol (E(2)) in response to gonadotropins, and an increased frequency of granulosa cell (GC) apoptosis. In this study, we show that the increase in steroidal response is associated with enhanced expression of Cyp17a1, Hsd17b, and Cyp19a1, which encode the enzymes catalyzing the synthesis of 17-OHP(4), testosterone, and E(2) respectively. Using a proteomic approach, we identified stathmin (STMN1), as a protein that is overproduced in 17NF ovaries. In its phosphorylated state, STMN1 mediates a cell death signal initiated by tumor necrosis factor α (TNF). STMN1 is expressed in GCs and excessive NGF increases its abundance as well as that of its forms phosphorylated at serine (Ser) 16, 25, and 38. TNF synthesis is also increased in 17NF ovaries, and this change is abolished by blocking neurotrophic tyrosine kinase receptors. Inhibiting TNF actions in vivo by administering a soluble TNF receptor prevented the increase in total and phosphorylated STMN1 production, as well as GC apoptosis in NGF-overproducing ovaries. These results indicate that an excess of NGF in the ovary promotes steroidogenesis by enhancing the expression of enzyme genes involved in 17-OHP(4), testosterone, and E(2) synthesis, and causes GC apoptosis by activating a TNF/ STMN1-mediated cell death pathway.
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Affiliation(s)
- Cecilia Garcia-Rudaz
- Division of Neuroscience, Oregon National Primate Research Center-Oregon Health and Science University, Beaverton, Oregon 97006, USA
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24
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Umetani M, Shaul PW. 27-Hydroxycholesterol: the first identified endogenous SERM. Trends Endocrinol Metab 2011; 22:130-5. [PMID: 21353593 PMCID: PMC3070823 DOI: 10.1016/j.tem.2011.01.003] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 01/15/2011] [Accepted: 01/18/2011] [Indexed: 12/12/2022]
Abstract
The cholesterol metabolite 27-hydroxycholesterol (27OHC) classically delivers sterols from peripheral tissues to the liver and is a substrate for bile acid synthesis. Recent studies have revealed that 27OHC also binds to and modifies the function of estrogen receptors ERα and ERβ. Experiments in mice lacking the enzyme which synthesizes 27OHC, CYP27A1, or the enzyme which catabolizes 27OHC, CYP7B1, have demonstrated that 27OHC adversely affects estrogen-related cardiovascular protection and bone mineralization. Work in breast cancer cells further indicates that 27OHC alters ER target gene expression to promote cell growth. Therefore, 27OHC is the first identified endogenous selective estrogen receptor modulator (SERM) and could have an important impact upon the cardiovascular system, bone biology, and cancer.
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Affiliation(s)
- Michihisa Umetani
- Division of Pulmonary and Vascular Biology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX USA
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX USA
| | - Philip W. Shaul
- Division of Pulmonary and Vascular Biology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX USA
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25
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Wu YG, Bennett J, Talla D, Stocco C. Testosterone, not 5α-dihydrotestosterone, stimulates LRH-1 leading to FSH-independent expression of Cyp19 and P450scc in granulosa cells. Mol Endocrinol 2011; 25:656-68. [PMID: 21273442 DOI: 10.1210/me.2010-0367] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Androgens are crucial for normal folliculogenesis and female fertility as evidenced in androgen receptor-null and granulosa cell conditional knockout mice. It is thought, however, that the multiple effects of androgens in the ovary are mainly complementary to the actions of gonadotropins. Using primary rat granulosa cells, we demonstrated that in the absence of gonadotropins, testosterone (T) increases aromatase (Cyp19) and P450 side-change cleavage expression, two enzymes crucial for normal ovarian function. T can be converted into estradiol, a classical estrogen, by Cyp19 and into 5α-dihydrotestosterone, a pure androgen, by 5α-reductase. However, inhibition of Cyp19 and/or 5α-reductase did not prevent the stimulatory effects of T. In contrast, the effect of this steroid was potentiated by blocking 5α-reductase. Additionally, T, not 5α-dihydrotestosterone, stimulates liver receptor homolog-1 (LRH-1) expression, whereas the expression of steroidogenic factor-1 (SF-1) was not affected by either steroid. LRH-1 and SF-1 are transcription factors known to be involved in the regulation of Cyp19. Accordingly, small interference RNA against LRH-1 prevented Cyp19 and P450 side-change cleavage up-regulation whereas anti-SF-1 small interference RNA had no effects. Chromatin immunoprecipitation demonstrated that T stimulation of LRH-1 leads to the recruitment of LRH-1 to the native Cyp19 promoter, which was not affected by cotreatment with 5α-reductase and Cyp19 inhibitors. Finally, gel shift and supershift analysis demonstrated that the androgen receptor binds to an androgen response element located within the LRH-1 promoter. These results provide novel evidence that T has a direct effect on the expression of genes involved in granulosa cell differentiation.
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Affiliation(s)
- Yan-Guang Wu
- Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612, USA
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26
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Hunter AC, Collins C, Dodd HT, Dedi C, Koussoroplis SJ. Transformation of a series of saturated isomeric steroidal diols by Aspergillus tamarii KITA reveals a precise stereochemical requirement for entrance into the lactonization pathway. J Steroid Biochem Mol Biol 2010; 122:352-8. [PMID: 20832471 DOI: 10.1016/j.jsbmb.2010.08.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Revised: 08/12/2010] [Accepted: 08/31/2010] [Indexed: 10/19/2022]
Abstract
Four isomers of 5α-androstan-3,17-diol have been transformed by the filamentous fungus Aspergillus tamarii, an organism which has the ability to convert progesterone to testololactone in high yield through an endogenous four step enzymatic pathway. The only diol handled within the lactonization pathway was 5α-androstan-3α,17β-diol which, uniquely underwent oxidation of the 17β-alcohol to the 17-ketone prior to its Baeyer-Villiger oxidation and the subsequent production of 3α-hydroxy-17a-oxa-D-homo-5α-androstan-17-one. This demonstrated highly specific stereochemical requirements of the 17β-hydroxysteroid dehydrogenase for oxidation of this specific steroidal diol to occur. In contrast, the other three diols were transformed within the hydroxylation pathway resulting in functionalization at C-11β. Only 5α-androstan-3β,17α-diol could bind to the hydroxylase in multiple binding modes undergoing monohydroxylation in 6β and 7β positions. Evidence from this study has indicated that hydroxylation of saturated steroidal lactones may occur following binding of ring-D in its open form in which an α-alcohol is generated with close spatial parity to the C-17α hydroxyl position. All metabolites were isolated by column chromatography and were identified by (1)H, (13)C NMR and DEPT analysis and further characterized using infra-red, elemental analysis and accurate mass measurement.
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Affiliation(s)
- A Christy Hunter
- Molecular Targeting and Polymer Toxicology Group, School of Pharmacy, The Huxley Biosciences Building, University of Brighton, East Sussex BN2 4GJ, UK.
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27
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Provenzano C, Pascucci B, Lupari E, Civitareale D. Large scale analysis of transcription factor TTF-1/NKX2.1 target genes in GnRH secreting cell line GT1-7. Mol Cell Endocrinol 2010; 323:215-23. [PMID: 20211691 DOI: 10.1016/j.mce.2010.02.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 02/26/2010] [Accepted: 02/28/2010] [Indexed: 11/24/2022]
Abstract
TTF-1/Nkx2.1 is a homeodomain-containing transcription factor required for the proper development of ventral forebrain, including some structures of the hypothalamus. TTF-1/Nkx2.1 remains expressed in the hypothalamus after birth and it plays a crucial role during sexual development. To identify putative TTF-1/Nkx2.1 target genes in GnRH neurons, we have studied the gene expression profile of the GT1-7 cells exogenously expressing TTF-1/Nkx2.1 coding gene. Our transcriptome analysis confirms that TTF-1/Nkx2.1 is involved in neuron morphogenesis and differentiation. Many of the newly identified TTF-1/Nkx2.1 target genes have a direct involvement with the central regulation of sexual maturity. In particular, we have identified Sparc as a gene directly regulated by TTF-1/Nkx2.1 at the promoter level. To further support the role of TTF-1 in GnRH neurons, we show that Sparc is involved in the regulation of the GnRH secretion in GT1-7 cells.
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Affiliation(s)
- Claudia Provenzano
- Institute of Neurobiology and Molecular Medicine, CNR, Via Fosso del Cavaliere 100, 00133 Rome, Italy
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28
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Stiles AR, McDonald JG, Bauman DR, Russell DW. CYP7B1: one cytochrome P450, two human genetic diseases, and multiple physiological functions. J Biol Chem 2009; 284:28485-9. [PMID: 19687010 PMCID: PMC2781391 DOI: 10.1074/jbc.r109.042168] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The CYP7B1 cytochrome P450 enzyme hydroxylates carbons 6 and 7 of the B ring of oxysterols and steroids. Hydroxylation reduces the biological activity of these substrates and facilitates their conversion to end products that are readily excreted from the body. CYP7B1 is expressed in the liver, reproductive tract, and brain and performs different physiological functions in each tissue. Hepatic CYP7B1 activity is crucial for the inactivation of oxysterols and their subsequent conversion into bile salts. Loss of CYP7B1 activity is associated with liver failure in children. In the reproductive tract, the enzyme metabolizes androgens that antagonize estrogen action; mice without CYP7B1 have abnormal prostates and ovaries. The role of CYP7B1 in brain is under investigation; recent studies show that spastic paraplegia type 5, a progressive neuropathy, is caused by loss-of-function mutations in the human gene.
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Affiliation(s)
- Ashlee R. Stiles
- From the Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9046
| | - Jeffrey G. McDonald
- From the Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9046
| | - David R. Bauman
- From the Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9046
| | - David W. Russell
- From the Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9046
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29
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Finkielstain GP, Forcinito P, Lui JCK, Barnes KM, Marino R, Makaroun S, Nguyen V, Lazarus JE, Nilsson O, Baron J. An extensive genetic program occurring during postnatal growth in multiple tissues. Endocrinology 2009; 150:1791-800. [PMID: 19036884 PMCID: PMC2659288 DOI: 10.1210/en.2008-0868] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Mammalian somatic growth is rapid in early postnatal life but then slows and eventually ceases in multiple tissues. We hypothesized that there exists a postnatal gene expression program that is common to multiple tissues and is responsible for this coordinate growth deceleration. Consistent with this hypothesis, microarray analysis identified more than 1600 genes that were regulated with age (1 vs. 4 wk) coordinately in kidney, lung, and heart of male mice, including many genes that regulate proliferation. As examples, we focused on three growth-promoting genes, Igf2, Mest, and Peg3, that were markedly down-regulated with age. In situ hybridization revealed that expression occurred in organ-specific parenchymal cells and suggested that the decreasing expression with age was due primarily to decreased expression per cell rather than a decreased number of expressing cells. The declining expression of these genes was slowed during hypothyroidism and growth inhibition (induced by propylthiouracil at 0-5 wk of age) in male rats, suggesting that the normal decline in expression is driven by growth rather than by age per se. We conclude that there exists an extensive genetic program occurring during postnatal life. Many of the involved genes are regulated coordinately in multiple organs, including many genes that regulate cell proliferation. At least some of these are themselves apparently regulated by growth, suggesting that, in the embryo, a gene expression pattern is established that allows for rapid somatic growth of multiple tissues, but then, during postnatal life, this growth leads to negative-feedback changes in gene expression that in turn slow and eventually halt somatic growth, thus imposing a fundamental limit on adult body size.
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Affiliation(s)
- Gabriela P Finkielstain
- Developmental Endocrinology Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-1103, USA
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30
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Sugiyama N, Andersson S, Lathe R, Fan X, Alonso-Magdalena P, Schwend T, Nalvarte I, Warner M, Gustafsson JA. Spatiotemporal dynamics of the expression of estrogen receptors in the postnatal mouse brain. Mol Psychiatry 2009; 14:223-32, 117. [PMID: 18982005 DOI: 10.1038/mp.2008.118] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This study reports on the spatiotemporal dynamics of the expression of estrogen receptors (ERs) in the mouse central nervous system (CNS) during the early postnatal and the peripubertal period. At postnatal day 7 (P7), neurons with strong nuclear immunostaining for both ERalpha and ERbeta1 were widely distributed throughout the brain. Sucrose density gradient sedimentation followed by western blotting supported the histochemical evidence for high levels of both ERs at P7. Over the following 2 days, there was a rapid downregulation of ERs. At P9, ERalpha expression was visible only in the hypothalamic area. Decline in ERbeta1 expression was slower than that of ERalpha, and ERalpha-negative, ERbeta1-positive cells were observed in the dentate gyrus and walls of third ventricle. Between P14 and P35, ERs were undetectable except for the hypothalamic area. As before P7, the ovary does not produce estrogen but does produce 5alpha-androstane-3beta, 17beta-diol (3betaAdiol), an estrogenic metabolite of dihydrotestosterone, we examined the effects of high levels of 3betaAdiol in the postnatal period. We used CYP7B1 knockout mice which cannot hydroxylate and inactivate 3betaAdiol. The brains of these mice are abnormally large with reduced apoptosis. In the early postnatal period, there was 1-week delay in the timing of the reduction in ER expression in the brain. These data reveal that the time when ERs might be activated in the brain is limited to the first 8 postnatal days. In addition, the importance of aromatase has to be reconsidered as the alternative estrogen, 3betaAdiol, is important in neuronal function in the postnatal brain.
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Affiliation(s)
- N Sugiyama
- Department of Biosciences and Nutrition, Karolinska Institute, Novum, Huddinge, Sweden
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31
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Omoto Y. Estrogen receptor-alpha signaling in growth of the ventral prostate: comparison of neonatal growth and postcastration regrowth. Endocrinology 2008; 149:4421-7. [PMID: 18535112 DOI: 10.1210/en.2007-1413] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A role for estrogen receptor (ER)-alpha in branching morphogenesis in the ventral prostate (VP) has previously been demonstrated; in the VP of ERalpha(-/-) mice, there are fewer side branches than in wild-type littermates. In the present study, we show that in the postnatal VP, fibroblast growth factor 10 (FGF10) is expressed in wild-type mice but not in ERalpha(-/-) mice, and because branching involves proliferation pathways also used in malignant growth, we investigated whether branching during regrowth of the VP after castration involves ERalpha and FGF10. ERalpha was not detectable in the prostates of sham-operated or castrated mice but was expressed in the prostatic epithelium between d 3 and 5 after testosterone replacement. Blocking either ERalpha or ERbeta with ICI 182,780 had no detectable effects on epithelial cell proliferation during regrowth by testosterone. The ERalpha agonist, propylpyrazoletriol, did not induce regrowth by itself, but exposure to propylpyrazoletriol on d 3-5 of testosterone replacement resulted in cyclin D1-positive cells in the ductal epithelium, invasion of FGF10-positive immune cells in the regrowing prostate, and budding 14 d later. Testosterone replacement alone did not induce cyclin D1, FGF10, or bud formation. These results indicate that stimulation of ERalpha is essential for ductal branching during postnatal prostate growth. During regrowth after castration, there is a window in time when selective stimulation of ERalpha can also induce ductal branching. The FGF10 for this growth comes from the immune system, not from the prostatic mesenchyme.
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Affiliation(s)
- Yoko Omoto
- Department of BioSciences and Nutrition, Karolinska University Hospital, Huddinge, Karolinska Institutet, SE-14186 Huddinge, Sweden.
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32
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Sikora MJ, Cordero KE, Larios JM, Johnson MD, Lippman ME, Rae JM. The androgen metabolite 5alpha-androstane-3beta,17beta-diol (3betaAdiol) induces breast cancer growth via estrogen receptor: implications for aromatase inhibitor resistance. Breast Cancer Res Treat 2008; 115:289-96. [PMID: 18521740 DOI: 10.1007/s10549-008-0080-8] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Accepted: 05/22/2008] [Indexed: 11/30/2022]
Abstract
The aromatase inhibitors (AIs) are used to treat estrogen receptor-positive (ER+) breast tumors in post-menopausal women, and function by blocking the conversion of adrenal androgens to estrogens by the enzyme CYP19 aromatase. Breast cancer patients receiving AI therapy have circulating estrogen levels below the level of detection; however, androgen concentrations remain unchanged. We were interested in studying the effects of androgens on breast cancer cell proliferation under profound estrogen-deprived conditions. Using in vitro models of estrogen-dependent breast cancer cell growth we show that the androgens testosterone and 5alpha-dihydrotestosterone induce the growth of MCF-7, T47D and BT-474 cells in the absence of estrogen. Furthermore, we demonstrate that under profound estrogen-deprived conditions these breast cancer cells up-regulate steroidogenic enzymes that can metabolize androgens to estrogens. Lastly, we found that the downstream metabolite of 5alpha-dihydrotestosterone, 5alpha-androstane-3beta,17beta-diol (3betaAdiol), is estrogenic in breast cancer cells, and induces growth and ER-signaling via activation of ERalpha. In conclusion, our results show that breast cancer cells deprived of estrogen up-regulate steroidogenic enzymes and metabolize androgens to estrogen-like steroids. The generation of estrogen-like steroids represents a potential mechanism of resistance to aromatase inhibitors.
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Affiliation(s)
- Matthew J Sikora
- Department of Pharmacology, University of Michigan Medical Center, Ann Arbor, MI 48109, USA
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33
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Pettersson H, Holmberg L, Axelson M, Norlin M. CYP7B1-mediated metabolism of dehydroepiandrosterone and 5α-androstane-3β,17β-diol - potential role(s) for estrogen signaling. FEBS J 2008; 275:1778-89. [DOI: 10.1111/j.1742-4658.2008.06336.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Koshibu K, Levitt P. Gene x environment effects: stress and memory dysfunctions caused by stress and gonadal factor irregularities during puberty in control and TGF-alpha hypomorphic mice. Neuropsychopharmacology 2008; 33:557-65. [PMID: 17473839 DOI: 10.1038/sj.npp.1301436] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The maturation of many neural functions occurs during puberty. An abnormal development of these processes, in the context of genetic vulnerability, may result in sex- and age-dependent penetrance of neuropsychiatric disorders. Reduced transforming growth factors-alpha (TGF-alpha) expression in Waved-1 (Wa-1) mice impairs the stress response and fear memory in adult males, but are absent or far less prominent in adult females and in pubertal males. Gonadectomy around the onset of puberty, when the mutant anatomical and behavioral phenotypes are undetectable, results in significant gene x environment effects. Adult control males show reduced physiological stress response as a result of gonadectomy, but not adult Wa-1 males. In females, pubertal gonadectomy elevates specific anxiety parameters only in adult control mice. There also are general sex-specific effects of pubertal gonadectomy on adult stress and fear memory. Surgical stress alone also induces sex- and genotype-dependent effects, albeit in different behavioral parameters than those affected by gonadectomy. We conclude that normal development of stress and memory processes is reliant on the levels of stress and gonadal factors during puberty, the effects of which are modulated by genetic factors and sex.
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Affiliation(s)
- Kyoko Koshibu
- Department of Neurobiology and Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA.
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35
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Oliveira AG, Coelho PH, Guedes FD, Mahecha GAB, Hess RA, Oliveira CA. 5alpha-Androstane-3beta,17beta-diol (3beta-diol), an estrogenic metabolite of 5alpha-dihydrotestosterone, is a potent modulator of estrogen receptor ERbeta expression in the ventral prostrate of adult rats. Steroids 2007; 72:914-22. [PMID: 17854852 DOI: 10.1016/j.steroids.2007.08.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2007] [Revised: 07/04/2007] [Accepted: 08/01/2007] [Indexed: 11/16/2022]
Abstract
Prostate is one of the major targets for dihydrotestosterone (DHT), however this gland is also recognized as a nonclassical target for estrogen as it expresses both types of estrogen receptors (ER), especially ERbeta. Nevertheless, the concentrations of aromatase and estradiol in the prostate are low, indicating that estradiol may not be the only estrogenic molecule to play a role in the prostate. It is known that DHT can be metabolized to 5alpha-androstane-3beta,17beta-diol (3beta-diol), a hormone that binds to ERbeta but not to AR. The concentration of 3beta-diol in prostate is much higher than that of estradiol. Based on the high concentration of 3beta-diol and since this metabolite is a physiological ERbeta ligand, we hypothesized that 3beta-diol would be involved in the regulation of ERbeta expression. To test this hypothesis, adult male rats were submitted to castration followed by estradiol, DHT or 3beta-diol replacement. ERbeta and AR protein levels in the prostate were investigated by immunohistochemistry and Western blotting assays. The results showed that after castration, the structure of the prostate was dramatically changed and ERbeta and AR protein levels were decreased. Estradiol had just minor effects on the parameters analyzed. DHT-induced partial recovery of ERbeta while it was the most effective inductor of AR expression. Replacement with 3beta-diol-induced the highest levels of ERbeta, but was comparatively less effective in recovering the AR expression and the gland structure. These results offer evidence that one functional role of 3beta-diol in the prostate may be autoregulation of its natural receptor, ERbeta.
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Affiliation(s)
- André G Oliveira
- Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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36
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Abstract
Although androgens and the androgen receptor (AR) have defining roles in male reproductive development and function, previously no role in female reproductive physiology beyond testosterone (T) as the precursor in estradiol (E(2)) biosynthesis was firmly established. Understanding the role and specific mechanisms of androgen action via the AR in the ovary has been limited by confusion on how to interpret results from pharmacological studies, because many androgens can be metabolized in vivo and in vitro to steroids that can also exert actions via the estrogen receptor (ESR). Recent genetic studies using mouse models with specific disruption of the Ar gene have highlighted the role that AR-mediated actions play in maintaining female fertility through key roles in the regulation of follicle health, development, and ovulation. Furthermore, these genetic studies have revealed that AR-mediated effects influence age-related female fertility, possibly via mechanisms acting predominantly at the hypothalamic-pituitary axis in a dose-dependent manner. This review focuses on combining the findings from pharmacological studies and novel genetic mouse models to unravel the roles of ovarian androgen actions in relation to female fertility and ovarian aging, as well as creating new insights into the role of androgens in androgen-associated reproductive disorders such as polycystic ovarian syndrome.
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Affiliation(s)
- K A Walters
- Andrology Laboratory, ANZAC Research Institute, Concord Hospital, University of Sydney, New South Wales 2139, Australia
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37
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Antunes-Martins A, Mizuno K, Irvine EE, Lepicard EM, Giese KP. Sex-dependent up-regulation of two splicing factors, Psf and Srp20, during hippocampal memory formation. Learn Mem 2007; 14:693-702. [PMID: 17911373 PMCID: PMC2044560 DOI: 10.1101/lm.640307] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Gene transcription is required for long-term memory (LTM) formation. LTM formation is impaired in a male-specific manner in mice lacking either of the two Ca(2+)/calmodulin-dependent kinase kinase (Camkk) genes. Since altered transcription was suggested to cause these impairments in LTM formation, we used microarrays to screen for CaMKKbeta-dependent gene expression changes. Here we show that the hippocampal mRNA expression of two splicing factors, splicing factor arginine/serine-rich 3 (Sfrs3/Srp20) and polypyrimidine tract-binding protein-associated splicing factor (Psf), is altered in CaMKKbeta-deficient males. In wild-type (WT) mice, the basal expression level in the hippocampus is higher in males than in females, and the sex difference in Srp20 expression is detectable before puberty. Training in two hippocampus-dependent learning tasks, the spatial version of the Morris water maze (MWM) and background contextual fear conditioning, increases the hippocampal mRNA expression of both splicing factors in WT males. However, the increase in Srp20 mRNA expression occurs only in males and not in females, whereas the up-regulation of Psf expression occurs in both sexes. Importantly, control experiments demonstrate that the up-regulation of both splicing factors is specific for the learned associations after contextual fear conditioning. In summary, we provide the first evidence for a regulation of splicing factors during LTM formation and we suggest that alternative splicing contributes to sex differences in LTM formation.
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Affiliation(s)
- Ana Antunes-Martins
- Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, United Kingdom
| | - Keiko Mizuno
- Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, United Kingdom
| | - Elaine E. Irvine
- Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, United Kingdom
| | - Eve M. Lepicard
- Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, United Kingdom
| | - K. Peter Giese
- Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, United Kingdom
- Centre for the Cellular Basis of Behaviour, The James Black Centre, King’s College London Institute of Psychiatry, London SE5 9NU, United Kingdom
- Corresponding author.E-mail ; fax 44-207-916-5994
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38
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Umetani M, Domoto H, Gormley AK, Yuhanna IS, Cummins CL, Javitt NB, Korach KS, Shaul PW, Mangelsdorf DJ. 27-Hydroxycholesterol is an endogenous SERM that inhibits the cardiovascular effects of estrogen. Nat Med 2007; 13:1185-92. [PMID: 17873880 DOI: 10.1038/nm1641] [Citation(s) in RCA: 296] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Accepted: 08/08/2007] [Indexed: 01/18/2023]
Abstract
The cardioprotective effects of estrogen are mediated by receptors expressed in vascular cells. Here we show that 27-hydroxycholesterol (27HC), an abundant cholesterol metabolite that is elevated with hypercholesterolemia and found in atherosclerotic lesions, is a competitive antagonist of estrogen receptor action in the vasculature. 27HC inhibited both the transcription-mediated and the non-transcription-mediated estrogen-dependent production of nitric oxide by vascular cells, resulting in reduced estrogen-induced vasorelaxation of rat aorta. Furthermore, increasing 27HC levels in mice by diet-induced hypercholesterolemia, pharmacologic administration or genetic manipulation (by knocking out the gene encoding the catabolic enzyme CYP7B1) decreased estrogen-dependent expression of vascular nitric oxide synthase and repressed carotid artery reendothelialization. As well as antiestrogenic effects, there were proestrogenic actions of 27HC that were cell-type specific, indicating that 27HC functions as an endogenous selective estrogen receptor modulator (SERM). Taken together, these studies point to 27HC as a contributing factor in the loss of estrogen protection from vascular disease.
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MESH Headings
- Animals
- Aorta, Thoracic/drug effects
- Binding, Competitive/drug effects
- Cardiotonic Agents/antagonists & inhibitors
- Cardiotonic Agents/metabolism
- Cardiotonic Agents/pharmacology
- Cell Culture Techniques
- Cell Line
- Cells, Cultured
- Cholesterol, Dietary/administration & dosage
- DNA, Complementary
- Dose-Response Relationship, Drug
- Drug Administration Schedule
- Estrogens/metabolism
- Estrogens/pharmacology
- Female
- Glutathione Transferase/metabolism
- Humans
- Hydroxycholesterols/administration & dosage
- Hydroxycholesterols/blood
- Hydroxycholesterols/pharmacology
- Inhibitory Concentration 50
- Injections, Subcutaneous
- Kidney/cytology
- Kinetics
- Male
- Mice
- Mice, Knockout
- Nitric Oxide/antagonists & inhibitors
- Nitric Oxide Synthase Type II/antagonists & inhibitors
- Nitric Oxide Synthase Type III
- RNA, Messenger/metabolism
- Receptors, Estrogen/antagonists & inhibitors
- Receptors, Estrogen/genetics
- Recombinant Fusion Proteins/antagonists & inhibitors
- Selective Estrogen Receptor Modulators/administration & dosage
- Selective Estrogen Receptor Modulators/blood
- Selective Estrogen Receptor Modulators/pharmacology
- Vasodilation/drug effects
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Affiliation(s)
- Michihisa Umetani
- Department of Pharmacology and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, Texas 75390-9050, USA
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39
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Maranghi F, Rescia M, Macrì C, Di Consiglio E, De Angelis G, Testai E, Farini D, De Felici M, Lorenzetti S, Mantovani A. Lindane may modulate the female reproductive development through the interaction with ER-beta: an in vivo-in vitro approach. Chem Biol Interact 2007; 169:1-14. [PMID: 17537412 DOI: 10.1016/j.cbi.2007.04.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 04/16/2007] [Accepted: 04/18/2007] [Indexed: 01/19/2023]
Abstract
Lindane (gamma-HCH) is a persistent environmental pollutant that may act as endocrine disrupter, affecting the nervous, immune and reproductive system, possibly through endocrine-mediated mechanisms. Since both estrogen receptors (ER-alpha and -beta) have shown to be target for endocrine disruption, we investigated the role of gamma-HCH on the development of female reproductive system. For an in vivo evaluation of gamma-HCH effects during prenatal period, pregnant CD1 mice were treated p.o. on gestational days 9-16 with 15 mg/kg bw/day of gamma-HCH and vehicle. The in vivo findings in treated F1 pups - in the absence of signs of systemic toxicity - included increase in the absolute and relative and absolute uterus weight revealed on post-natal day 22, earlier vaginal patency and reduced diameters of primary oocytes at fully sexual maturity. No effects on steroid hormone metabolism (aromatase, testosterone catabolism) were observed. Thus, gamma-HCH elicited subtle effects on female reproductive development likely mediated by ER-beta-mediated pathway(s), without a concurrent impairment of steroid hormone metabolism. Furthermore, to verify whether the endocrine interference of gamma-HCH is attributable to stimulation of ER-beta-mediated pathway(s), its effect has been evaluated in vitro on a cell line, LNCaP, expressing only functional ER-beta. In vitro treatments revealed a concentration-related effect on LNCaP cell viability and proliferation. Significantly, the contemporary addition of a pure anti-estrogen, the ER antagonist ICI 182,780, completely reversed gamma-HCH effects indicating an ER-beta-mediated action. Our findings indicate that gamma-HCH may act as endocrine disruptor during the female reproductive system development and ER-beta as a potential target for this compound and other endocrine disrupting chemicals as well.
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Affiliation(s)
- Francesca Maranghi
- Department of Food Safety and Veterinary Public Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
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40
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Merlani MI, Amiranashvili LS, Men’shova NI, Kemertelidze EP. Synthesis of 5α-androstan-3β,17β-diol from tigogenin. Chem Nat Compd 2007. [DOI: 10.1007/s10600-007-0041-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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41
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Picciarelli-Lima P, Oliveira AG, Reis AM, Kalapothakis E, Mahecha GAB, Hess RA, Oliveira CA. Effects of 3-beta-diol, an androgen metabolite with intrinsic estrogen-like effects, in modulating the aquaporin-9 expression in the rat efferent ductules. Reprod Biol Endocrinol 2006; 4:51. [PMID: 17026757 PMCID: PMC1615873 DOI: 10.1186/1477-7827-4-51] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2006] [Accepted: 10/06/2006] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Fluid homeostasis is critical for normal function of the male reproductive tract and aquaporins (AQP) play an important role in maintenance of this water and ion balance. Several AQPs have been identified in the male, but their regulation is not fully comprehended. Hormonal regulation of AQPs appears to be dependent on the steroid in the reproductive tract region. AQP9 displays unique hormonal regulation in the efferent ductules and epididymis, as it is regulated by both estrogen and dihydrotestosterone (DHT) in the efferent ductules, but only by DHT in the initial segment epididymis. Recent data have shown that a metabolite of DHT, 5-alpha-androstane-3-beta-17-beta-diol (3-beta-diol), once considered inactive, is also present in high concentrations in the male and indeed has biological activity. 3-beta-diol does not bind to the androgen receptor, but rather to estrogen receptors ER-alpha and ER-beta, with higher affinity for ER-beta. The existence of this estrogenic DHT metabolite has raised the possibility that estradiol may not be the only estrogen to play a major role in the male reproductive system. Considering that both ER-alpha and ER-beta are highly expressed in efferent ductules, we hypothesized that the DHT regulation of AQP9 could be due to the 3-beta-diol metabolite. METHODS To test this hypothesis, adult male rats were submitted to surgical castration followed by estradiol, DHT or 3-beta-diol replacement. Changes in AQP9 expression in the efferent ductules were investigated by using immunohistochemistry and Western blotting assay. RESULTS Data show that, after castration, AQP9 expression was significantly reduced in the efferent ductules. 3-beta-diol injections restored AQP9 expression, similar to DHT and estradiol. The results were confirmed by Western blotting assay. CONCLUSION This is the first evidence that 3-beta-diol has biological activity in the male reproductive tract and that this androgen metabolite has estrogen-like activity in the efferent ductules, whose major function is the reabsorption of luminal fluid.
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Affiliation(s)
- Patrícia Picciarelli-Lima
- Department of Morphology, Federal University of Minas Gerais, Cx. Postal 486, CEP 31.270-901, Belo Horizonte, Minas Gerais, Brazil
| | - André G Oliveira
- Department of Morphology, Federal University of Minas Gerais, Cx. Postal 486, CEP 31.270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Adelina M Reis
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Cx. Postal 486, CEP 31.270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Evanguedes Kalapothakis
- Department of General Biology, Federal University of Minas Gerais, Cx. Postal 486, CEP 31.270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Germán AB Mahecha
- Department of Morphology, Federal University of Minas Gerais, Cx. Postal 486, CEP 31.270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Rex A Hess
- Department of Veterinary Biosciences, University of Illinois, 2001 S. Lincoln, Urbana, IL 61802, USA
| | - Cleida A Oliveira
- Department of Morphology, Federal University of Minas Gerais, Cx. Postal 486, CEP 31.270-901, Belo Horizonte, Minas Gerais, Brazil
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42
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Tang W, Norlin M. Regulation of steroid hydroxylase CYP7B1 by androgens and estrogens in prostate cancer LNCaP cells. Biochem Biophys Res Commun 2006; 344:540-6. [PMID: 16630558 DOI: 10.1016/j.bbrc.2006.03.175] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2006] [Accepted: 03/26/2006] [Indexed: 11/29/2022]
Abstract
The present study reports effects of androgens and estrogens on human CYP7B1 transcription in prostate cancer LNCaP cells. Studies with rodents have suggested a role for the CYP7B1 enzyme in balancing cellular hormone levels important for prostate growth. Little is, however, known about the regulation of human CYP7B1. The current study showed strong suppression of a human CYP7B1 luciferase reporter gene by dihydrotestosterone (DHT) in prostate cancer LNCaP cells. Also, DHT and overexpression of androgen receptor (AR) suppressed CYP7B1 promoter activity and CYP7B1-mediated catalysis in kidney-derived HEK293 cells. Effects on CYP7B1 transcription were observed also by estrogen receptors (ER). The effects appeared different for different estrogens. CYP7B1 was stimulated by synthetic ER agonists but suppressed by 17beta-estradiol and 5alpha-androstane-3beta,17beta-diol in LNCaP cells. Our data indicate an important role for CYP7B1 in balancing prostate hormone levels in human cells. In particular, the data suggest that androgens may control intraprostatic levels of estrogen via regulation of CYP7B1-mediated metabolism.
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Affiliation(s)
- Wanjin Tang
- Department of Pharmaceutical Biosciences, Division of Biochemistry, University of Uppsala, Box 578, S-751 23 Uppsala, Sweden
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