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Rossetti MF, Varayoud J, Ramos JG. Steroidogenic enzymes in the hippocampus: Transcriptional regulation aspects. VITAMINS AND HORMONES 2022; 118:171-198. [PMID: 35180926 DOI: 10.1016/bs.vh.2021.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Neurosteroids are steroids synthesized de novo from cholesterol in brain regions, and regulate processes associated with the development and functioning of the nervous system. Enzymes and proteins involved in the synthesis of these steroids have been detected in several brain regions, including hippocampus, hypothalamus, and cerebral cortex. Hippocampus has long been associated with learning and memory functions, while the loss of its functionality has been linked to neurodegenerative pathologies. In this sense, neurosteroids are critical for the maintenance of hippocampal functions and neuroprotective effects. Moreover, several factors have been shown to deregulate expression of steroidogenic enzymes in the rodent brain, including aging, enrichment experiences, diet habits, drug/alcohol consumption, hormone fluctuations, neurodegenerative processes and other diseases. These transcriptional deregulations are mediated mainly by transcription factors and epigenetic mechanisms. An epigenetic modification of chromatin involves changes in bases and associated proteins in the absence of changes in the DNA sequence. One of the most well-studied mechanisms related to gene silencing is DNA methylation, which involves a reversible addition of methyl groups in a cytosine base. Importantly, these epigenetic marks could be maintained over time and could be transmitted transgenerationally. The aim of this chapter is to present the most relevant steroidogenic enzymes described in rodent hippocampus; to discuss about their transcriptional regulation under different conditions; to show the main gene control regions and to propose DNA methylation as an epigenetic mechanism through which the expression of these enzymes could be controlled.
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Affiliation(s)
- María Florencia Rossetti
- Departamento de Bioquímica Clínica y Cuantitativa, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina; Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina
| | - Jorgelina Varayoud
- Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina; Cátedra de Fisiología Humana, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina
| | - Jorge Guillermo Ramos
- Departamento de Bioquímica Clínica y Cuantitativa, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina; Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina.
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Blondet A, Martin G, Paulic L, Perrard MH, Durand P. An in vitro bioassay to assess the potential global toxicity of waters on spermatogenesis: a pilot study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:26606-26616. [PMID: 33495953 DOI: 10.1007/s11356-021-12480-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
Many toxicants are present in water as a mixture. Male infertility is one of the environmental impacts in developed countries. Using our rat seminiferous tubule culture model, we evaluated the effects of waters of different origins, on several parameters of the seminiferous epithelium. Concentrated culture medium was diluted with the waters to be tested (final concentrations of the tested waters were between 8 and 80%). The integrity of the blood-testis barrier was assessed by the trans-epithelial electric resistance (TEER). The levels of mRNAs specific of Sertoli cells, of cellular junctions, of each population of germ cells, of androgen receptor, of estrogen receptor α, and of aromatase were also studied. We report, here, the results obtained with ten waters, some of them possessing a negative effect on spermatogenesis. The results showed that, according to the tested waters, their effects on the parameters studied might be quite different indicating many different mechanisms of toxicity, including some endocrine-disrupting effects. It has been reported that men with impaired semen parameters have an increased mortality rate suggesting semen quality may provide a fundamental biomarker of overall male health. Hence, we have developed a relevant in vitro bioassay allowing the evaluation of the potential toxicity of different types of waters on male fertility and to assess some aspects of their mechanism of action. In addition to the TEER measure, the number and/or the identity of the studied mRNAs can be largely increased and/or modified, thus enhancing the possibility of using this model as a "warning system."
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Affiliation(s)
- Antonine Blondet
- Kallistem, Vétagrosup, 1 Avenue Bourgelat, 69280, Marcy-l'Etoile, France
| | - Guillaume Martin
- Kallistem, Vétagrosup, 1 Avenue Bourgelat, 69280, Marcy-l'Etoile, France
| | - Laurent Paulic
- Tame-Water, 3 Rue Jean Jaurès, 85000, La Roche sur Yon, France
| | - Marie-Hélène Perrard
- INSERM U 1208, Institut Cellule Souche et Cerveau, 18 Avenue du Doyen Lépine, 69500, Bron, France
| | - Philippe Durand
- Kallistem, Vétagrosup, 1 Avenue Bourgelat, 69280, Marcy-l'Etoile, France.
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3
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Zanatta AP, Gonçalves R, Ourique da Silva F, Pedrosa RC, Zanatta L, Bouraïma-Lelong H, Delalande C, Mena Barreto Silva FR. Estradiol and 1α,25(OH) 2 vitamin D 3 share plasma membrane downstream signal transduction through calcium influx and genomic activation in immature rat testis. Theriogenology 2021; 172:36-46. [PMID: 34091204 DOI: 10.1016/j.theriogenology.2021.05.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 01/06/2023]
Abstract
The aim of this study was to investigate the rapid response pathway and gene and protein expression profiles of the rat testis in response to estradiol (E2) and 1α,25(OH)2 vitamin D3 (1,25-D3), to understand how they mediate their effects on the first spermatogenic wave. To do this, we compared the effects of 1,25-D3 and E2 on 45calcium(Ca2+) uptake and the involvement of estrogen receptors (ESR) in their rapid responses. Additionally, we studied the downstream signal transduction effects of 1,25-D3 and E2 on cyclin A1/B1 and cellular cycle protein expression. As previously observed for 1,25-D3, E2 also increased 45Ca2+ uptake in immature rat testes via voltage-dependent Ca2+ channels, Ca2+-dependent chloride channels and via the activation of protein kinase C, protein kinase A and mitogen-activated protein kinase kinase (MEK). Elevated aromatase expression by testes was observed in the presence of 1,25-D3 and both hormones decreased ESR mRNA expression. Furthermore, 1,25-D3 and E2 diminished cyclin A1 mRNA expression, but E2 did not affect cyclin B1 mRNA levels. Consistent with these findings, the immunocontent of cyclin A1 and B1 in the testes was also increased by 1,25-D3 and E2. 1,25-D3 increased expressions of the p16 and p53 proteins, supporting the anti-proliferative and pro-apoptotic properties of 1,25-D3, while E2 also augmented p16. Data indicate that both hormones trigger rapid responses at the plasma membrane that may control the expression of gene and proteins related to cell cycle regulation, and thereby modulate spermatogenesis.
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Affiliation(s)
- Ana Paula Zanatta
- Laboratório de Hormônios & Transdução de Sinais, Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil; Normandie Univ, UNICAEN, INRA, OeReCa, 14000, Caen, France
| | - Renata Gonçalves
- Laboratório de Hormônios & Transdução de Sinais, Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Fabiana Ourique da Silva
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Rozangela Curi Pedrosa
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Leila Zanatta
- Departamento de Enfermagem, Centro de Educação Superior do Oeste, Universidade do Estado de Santa Catarina - UDESC, Chapecó, SC, Brazil
| | | | | | - Fátima Regina Mena Barreto Silva
- Laboratório de Hormônios & Transdução de Sinais, Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
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Ali AA, Cui X, Pertile RAN, Li X, Medley G, Alexander SA, Whitehouse AJO, McGrath JJ, Eyles DW. Developmental vitamin D deficiency increases foetal exposure to testosterone. Mol Autism 2020; 11:96. [PMID: 33298169 PMCID: PMC7727109 DOI: 10.1186/s13229-020-00399-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 11/06/2020] [Indexed: 12/18/2022] Open
Abstract
Background Autism spectrum disorder (ASD) is a group of neurodevelopmental disorders which are more common in males. The ‘prenatal sex steroid’ hypothesis links excessive sex-steroid exposure during foetal life with the behavioural differences observed in ASD. However, the reason why sex steroid exposure may be excessive remains unclear. Epidemiological studies have identified several environmental risk factors associated with ASD, including developmental vitamin D (DVD) deficiency. We have demonstrated in an animal model that DVD-deficiency is associated with a hyper-inflammatory response in placentas from male but not female foetuses. Vitamin D also regulates the expression of several steroidogenic enzymes in vitro. Therefore using this animal model, we have examined whether DVD-deficiency leads to increased sex-steroid levels in both the maternal and foetal compartments. Methods Female rats are fed a vitamin D deficient diet from 6 weeks before mating until tissue collection at embryonic day 18. We examined the levels of testosterone, androstenedione and corticosterone in maternal plasma, foetal brains and amniotic fluid. We further examined gene expressions of steroidogenic enzymes and DNA methylation of aromatase promoters in foetal brains as a potential molecular mechanism regulating testosterone expression. Results We show that DVD-deficiency increases testosterone levels in maternal blood. We also show elevated levels of testosterone and androstenedione in the amniotic fluid of female but not male DVD-deficient foetuses. Testosterone levels were also elevated in DVD-deficient male brains. Vitamin D, like other steroid-related hormones, regulates gene expression via methylation. Therefore we examined whether the significant elevation in testosterone in male brains was due to such a potential gene-silencing mechanism. We show that the promoter of aromatase was hyper-methylated compared to male controls. Limitations A reduction in aromatase, in addition to causing excessive testosterone, could also lead to a reduction in estradiol which was not examined here. Conclusions This study is the first to show how an epidemiologically established environmental risk factor for ASD may selectively elevate testosterone in male embryonic brains. These findings provide further mechanistic support for the prenatal sex steroid theory of ASD.
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Affiliation(s)
- Asad Amanat Ali
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia
| | - Xiaoying Cui
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia.,Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Wacol, QLD, Australia
| | | | - Xiang Li
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia
| | - Gregory Medley
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia
| | - Suzanne Adele Alexander
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia.,Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Wacol, QLD, Australia
| | - Andrew J O Whitehouse
- Telethon Kids Institute, The University of Western Australia, Perth, WA, 6009, Australia
| | - John Joseph McGrath
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia.,Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Wacol, QLD, Australia.,NCRR-National Centre for Register-Based Research, Department of Economics and Business Economics, Aarhus University, Aarhus C, Denmark
| | - Darryl Walter Eyles
- Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Australia. .,Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Wacol, QLD, Australia.
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Zhang X, Min Q, Li M, Liu X, Li M, Wang D. Mutation of
cyp19a1b
results in sterile males due to efferent duct obstruction in Nile tilapia. Mol Reprod Dev 2019; 86:1224-1235. [DOI: 10.1002/mrd.23237] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 06/28/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Xianbo Zhang
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life SciencesSouthwest University Chongqing China
- Guizhou Fisheries Research InstituteGuizhou Academy of Agriculture Sciences Guiyang Guizhou China
| | - Qianwen Min
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life SciencesSouthwest University Chongqing China
| | - Mengru Li
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life SciencesSouthwest University Chongqing China
| | - Xingyong Liu
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life SciencesSouthwest University Chongqing China
| | - Minghui Li
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life SciencesSouthwest University Chongqing China
| | - Deshou Wang
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life SciencesSouthwest University Chongqing China
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Tang H, Chen Y, Liu Y, Yin Y, Li G, Guo Y, Liu X, Lin H. New Insights Into the Role of Estrogens in Male Fertility Based on Findings in Aromatase-Deficient Zebrafish. Endocrinology 2017; 158:3042-3054. [PMID: 28911176 DOI: 10.1210/en.2017-00156] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 07/11/2017] [Indexed: 11/19/2022]
Abstract
It has been demonstrated that estrogens are indispensable for male fertility in mammals. Aromatase (encoded by CYP19) catalyzes the final step of estradiol biosynthesis. However, less is known about the role of aromatase in male fertility in nonmammalian species. Fish aromatase is encoded by two separate genes: the gonad-specific cyp19a1a and the brain-specific cyp19a1b. In a recent study, we used transcription activatorlike effector nucleases to systematically generate cyp19a1a and cyp19a1b mutant lines and a cyp19a1a;cyp19a1b double-mutant line in zebrafish and demonstrated that cyp19a1a was indispensable for sex differentiation. In this study, we focused on male fertility in these aromatase-deficient zebrafish. Our results showed that all aromatase-deficient male fish had normal fertility even at 1 year after fertilization. Interestingly, we observed more spermatozoa in the cyp19a1a and double-mutant males than in the wild-type and cyp19a1b mutant males. The whole-body androgen levels, follicle-stimulating hormone β and luteinizing hormone β protein levels in the pituitary, and transcript levels of genes known to be involved in spermatogenesis and steroidogenesis in the testes were significantly higher in the cyp19a1a mutant and aromatase double-mutant males than in the wild-type and cyp19a1b mutant males. These results might explain why more spermatozoa were observed in these fish. Collectively, our findings indicate that estrogens are not needed to achieve and maintain normal fertility in male zebrafish. This finding challenges the traditional view that estrogens are indispensable for male fertility.
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Affiliation(s)
- Haipei Tang
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yu Chen
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yun Liu
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yike Yin
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Gaofei Li
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yin Guo
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xiaochun Liu
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
- South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Guangzhou 510006, China
| | - Haoran Lin
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
- South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Guangzhou 510006, China
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7
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Menad R, Smaï S, Bonnet X, Gernigon-Spychalowicz T, Moudilou E, Khammar F, Exbrayat JM. Seasonal variations of aromatase and estrogen receptors expression in the testis of free-ranging sand rats. Acta Histochem 2017; 119:382-391. [PMID: 28427772 DOI: 10.1016/j.acthis.2017.03.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 03/29/2017] [Accepted: 03/29/2017] [Indexed: 12/16/2022]
Abstract
An increasing number of studies revealed the importance of estrogen in male reproduction. However, most research was conducted in laboratory rodents subjected to standardized environmental conditions. Therefore, seasonal regulations of estrogen pathways remain poorly understood under natural conditions. Using immunohistochemistry, the expression of several molecules involved in the functioning of testis (i.e. 17-β estradiol [E2], P450 aromatase, estrogen receptors ESR1, ESR2, and GPER1 [also known as GPR30]) were investigated in free-ranging fat sand rats, Psammomys obesus, during the breeding and resting seasons. Leydig cells showed a strong immunoreactivity for aromatase in the testis sampled during the breeding season only; however, E2, ESR1, ESR2 and GPER1 were present during both seasons. Sertoli cells showed a positive signal for E2 and ESR2 during the breeding season; though, all molecules, except GPER1, were present during the resting season. Spermatogonia were reactive for E2, ESR2 and GPER1 during the breeding season and for ESR1 and GPER1 during the resting season. During both seasons, spermatocytes-I presented a moderate reactivity for E2, ESR1, ESR2 and a strong reactivity for GPER1; aromatase was detected during the resting season only. Spermatids and spermatozoa were present exclusively during breeding season and were reactive for all molecules; except round spermatids that were negative for aromatase. The functioning of the testis depends on finely tuned stimulation and inhibition systems. Our results suggest that differential expression of aromatase, ESR1, ESR2, and GPER1 across cells types is involved in the seasonal activation/inactivation cycle of spermatogenesis in a free-ranging species.
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8
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Rossetti MF, Varayoud J, Lazzarino GP, Luque EH, Ramos JG. Pregnancy and lactation differentially modify the transcriptional regulation of steroidogenic enzymes through DNA methylation mechanisms in the hippocampus of aged rats. Mol Cell Endocrinol 2016; 429:73-83. [PMID: 27040308 DOI: 10.1016/j.mce.2016.03.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 03/29/2016] [Accepted: 03/30/2016] [Indexed: 01/10/2023]
Abstract
In the present study, we examined the mRNA expression and DNA methylation state of steroidogenic enzymes in the hippocampus of young adult (90-days-old) and middle-aged (450-days-old) nulliparous rats, and middle-aged multiparous rats subjected to three pregnancies with and without lactation. Aging decreased the mRNA levels of steroidogenic-related genes, while pregnancy and lactation significantly reduced the effect of aging, maintaining high expression levels of cytochrome P450 side-chain cleavage (P450scc), steroid 5α-reductase-1 (5αR-1), cytochrome P450arom (P450arom) and aldosterone synthase (P450(11β)-2). In addition, pregnancy and lactation diminished the methylation state of the 5αR-1 promoter and increased the transcription of brain-derived neurotrophic factor, synaptophysin and spinophilin. Pregnancy without lactation increased P450scc and 5αR-1 gene expression and decreased the methylation of their promoters. We concluded that the age-related decrease in the mRNA expression of steroidogenic enzymes is differentially attenuated by pregnancy and lactation in the rat hippocampus and that differential methylation mechanisms could be involved.
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Affiliation(s)
- María F Rossetti
- Departamento de Bioquímica Clínica y Cuantitativa, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina; Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina.
| | - Jorgelina Varayoud
- Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina.
| | - Gisela P Lazzarino
- Departamento de Bioquímica Clínica y Cuantitativa, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina; Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina.
| | - Enrique H Luque
- Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina.
| | - Jorge G Ramos
- Departamento de Bioquímica Clínica y Cuantitativa, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina; Instituto de Salud y Ambiente del Litoral (ISAL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina.
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9
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Pellegrini E, Diotel N, Vaillant-Capitaine C, Pérez Maria R, Gueguen MM, Nasri A, Cano Nicolau J, Kah O. Steroid modulation of neurogenesis: Focus on radial glial cells in zebrafish. J Steroid Biochem Mol Biol 2016; 160:27-36. [PMID: 26151741 DOI: 10.1016/j.jsbmb.2015.06.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 06/01/2015] [Accepted: 06/16/2015] [Indexed: 10/23/2022]
Abstract
Estrogens are known as steroid hormones affecting the brain in many different ways and a wealth of data now document effects on neurogenesis. Estrogens are provided by the periphery but can also be locally produced within the brain itself due to local aromatization of circulating androgens. Adult neurogenesis is described in all vertebrate species examined so far, but comparative investigations have brought to light differences between vertebrate groups. In teleost fishes, the neurogenic activity is spectacular and adult stem cells maintain their mitogenic activity in many proliferative areas within the brain. Fish are also quite unique because brain aromatase expression is limited to radial glia cells, the progenitor cells of adult fish brain. The zebrafish has emerged as an interesting vertebrate model to elucidate the cellular and molecular mechanisms of adult neurogenesis, and notably its modulation by steroids. The main objective of this review is to summarize data related to the functional link between estrogens production in the brain and neurogenesis in fish. First, we will demonstrate that the brain of zebrafish is an endogenous source of steroids and is directly targeted by local and/or peripheral steroids. Then, we will present data demonstrating the progenitor nature of radial glial cells in the brain of adult fish. Next, we will emphasize the role of estrogens in constitutive neurogenesis and its potential contribution to the regenerative neurogenesis. Finally, the negative impacts on neurogenesis of synthetic hormones used in contraceptive pills production and released in the aquatic environment will be discussed.
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Affiliation(s)
- Elisabeth Pellegrini
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France.
| | - Nicolas Diotel
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France; Inserm UMR 1188, Diabète athérothrombose Thérapies Réunion Océan Indien (DéTROI), plateforme CYROI, Sainte-Clotilde F-97490, France; Université de La Réunion, UMR 1188, Sainte-Clotilde F-97490, France
| | - Colette Vaillant-Capitaine
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
| | - Rita Pérez Maria
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France; Laboratorio de Ictiología, Instituto Nacional de Limnología (INALI. CONICET-UNL), Paraje El Pozo, Ciudad Universitaria UNL, 3000 Santa Fe, Argentina
| | - Marie-Madeleine Gueguen
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
| | - Ahmed Nasri
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France; Laboratoire de Biosurveillance de l'Environnement, Unité d'Ecologie côtière et d'Ecotoxicologie, Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia
| | - Joel Cano Nicolau
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
| | - Olivier Kah
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
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10
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Li X, Li H, Jia L, Li X, Rahman N. Oestrogen action and male fertility: experimental and clinical findings. Cell Mol Life Sci 2015; 72:3915-30. [PMID: 26160724 PMCID: PMC11113595 DOI: 10.1007/s00018-015-1981-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 06/05/2015] [Accepted: 06/29/2015] [Indexed: 12/24/2022]
Abstract
A proper balance between androgen and oestrogen is fundamental for normal male reproductive development and function in both animals and humans. This balance is governed by the cytochrome P450 aromatase, which is expressed also under spatio-temporal control. Oestrogen receptors ERα and/or ERβ, together with the membrane-associated G-protein-coupled functional ER (GPER), mediate the effects of oestrogen in the testis. Oestrogen action in male reproduction is more complex than previously predicted. The androgen/oestrogen balance and its regulation in the masculinisation programming window (MPW) during foetal life is the most critical period for the development of the male reproductive system. If this balance is impaired during the MPW, the male reproductive system may be negatively affected. Recent data from genetically modified mice and human infertile patients have shown that oestrogens may promote the engulfment of live Leydig cells by macrophages leading to male infertility. We also discuss recent data on environmental oestrogen exposure in men and rodents, where a rodent-human distinction is crucial and analyse some aspects of male fertility potentially related to impaired oestrogen/androgen balance.
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Affiliation(s)
- Xiangdong Li
- State Key Laboratory of the Agro-Biotechnology, Faculty of Biological Sciences, China Agricultural University, Beijing, China.
| | - Haiwen Li
- Department of Nutrition and Food Science, University of Maryland, College Park, MD, USA
| | - Lina Jia
- State Key Laboratory of the Agro-Biotechnology, Faculty of Biological Sciences, China Agricultural University, Beijing, China
| | - Xiru Li
- Department of General Surgery, The 301th Hospital of PLA, Beijing, China
| | - Nafis Rahman
- Department of Physiology, Institute F Biomedicine, University of Turku, Turku, Finland
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11
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Delalande C, Goupil AS, Lareyre JJ, Le Gac F. Differential expression patterns of three aromatase genes and of four estrogen receptors genes in the testes of trout (Oncorhynchus mykiss). Mol Reprod Dev 2015; 82:694-708. [DOI: 10.1002/mrd.22509] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 05/24/2015] [Indexed: 12/16/2022]
Affiliation(s)
- Christelle Delalande
- Normandie Univ; France
- UNICAEN, EA 2608; France
- INRA USC 1377; 14032 CAEN cedex 5; France
| | - Anne-Sophie Goupil
- INRA, UR1037 Laboratoire de Physiologie et Génomique des Poissons; SFR BIOSIT; Biogenouest; 35042 Rennes France
| | - Jean-Jacques Lareyre
- INRA, UR1037 Laboratoire de Physiologie et Génomique des Poissons; SFR BIOSIT; Biogenouest; 35042 Rennes France
| | - Florence Le Gac
- INRA, UR1037 Laboratoire de Physiologie et Génomique des Poissons; SFR BIOSIT; Biogenouest; 35042 Rennes France
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12
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Carreau S, Bouraima-Lelong H, Delalande C. Estrogens in male germ cells. SPERMATOGENESIS 2014; 1:90-94. [PMID: 22319655 DOI: 10.4161/spmg.1.2.16766] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 06/02/2011] [Accepted: 06/03/2011] [Indexed: 01/06/2023]
Abstract
The biosynthesis of steroids and the production of spermatozoa are two major functions of the mammalian testis which are tightly controlled by gonadotropins and numerous locally produced factors. Among these are the estrogens that are produced within the seminiferous epithelium via the irreversible transformation of androgens (C19) into estrogens (C18) by aromatase. We have recently reported that male germ cells are the new source of estrogens in the testis. For instance, estrogen receptors (ER) are found mainly in spermatids that give rise to spermatozoa. Moreover, it is noteworthy that GPR 30 (a transmembrane ER) induces rapid responses after estradiol binding, which, in turn, modulates cyclins and proapoptotic factors (e.g., BAX) to affect germ cell cycle progression and apoptosis. In summary, at least in the animal species that were studied thus far, germ cells are the major source and the target of estrogens, affecting normal male gonadal development and spermatogenesis, in particular spermiogenesis. These findings have also shed new light on the possible adverse effects of endocrine disruptors having estrogenic activities that can cause abnormal development of the male genital tract.
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13
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Functional Importance of 1α,25(OH)2-Vitamin D3 and the Identification of Its Nongenomic and Genomic Signaling Pathways in the Testis. ACTA ACUST UNITED AC 2014. [DOI: 10.1155/2014/808906] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The 1α,25(OH)2-vitamin D3 (1,25-D3) is known by its classic effects on Ca2+ metabolism and regulation of cellular proliferation and differentiation. The hormone 1,25-D3 acts in the testis through nongenomic and genomic events being implicated in the success of spermatogenesis in rats and in human being. The aim of this review was to highlight the effect and intracellular pathways of 1,25-D3 to modulate the spermatogenesis. The pivotal role of 1,25-D3 in male reproduction is reinforced by the presence of VDR and 1α-hydroxylase in reproductive tract. Also, the marked expression of VDR and the VD metabolizing enzymes in human testis, ejaculatory tract, and mature spermatozoa implicates the 1,25-D3 in spermatogenesis and maturation of human spermatozoa. Among genomic events, 1,25-D3 influences the expression of calcium binding protein and stimulates aromatase gene expression through a nongenomic activation of the membrane-bound VDR receptor involving the PKA pathway in the testis. Also, 1,25-D3 stimulates amino acid transport and exocytosis in testis by nongenomic events coupled to ionic currents triggered at plasma membrane. All together, the demonstration that 1,25-D3 regulates both Sertoli cell and sperm function may be useful for the study and development of new therapeutic strategies for the male reproductive disorders.
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14
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Molecular mechanisms of luteinization. Obstet Gynecol Sci 2014; 57:93-101. [PMID: 24678481 PMCID: PMC3965707 DOI: 10.5468/ogs.2014.57.2.93] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 01/29/2014] [Accepted: 02/04/2014] [Indexed: 11/24/2022] Open
Abstract
Dynamic changes in steroidogenesis occur in ovarian granulosa cells during ovulation after the LH surge. The ovulatory LH surge induces rapid up-regulation of steroidogenic acute regulatory (StAR) protein and rapid down-regulation of aromatase (Cyp19a1) in granulosa cells undergoing luteinization during ovulation. These rapid changes in StAR and Cyp19a1 gene expression after the LH surge efficiently facilitate progesterone production, which plays a crucial role in ovulation and the following luteinization. Recently, it has become clear that epigenetic regulation such as histone modifications and DNA methylation play a key role in gene expression through the chromatin remodeling of the promoter region. This study reports the in vivo evidence that epigenetic mechanisms including histone modifications, DNA methylation and chromatin remodeling are involved in the rapid changes of StAR and Cyp19a1 gene expression in granulosa cells undergoing luteinization during ovulation.
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15
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Lee L, Asada H, Kizuka F, Tamura I, Maekawa R, Taketani T, Sato S, Yamagata Y, Tamura H, Sugino N. Changes in histone modification and DNA methylation of the StAR and Cyp19a1 promoter regions in granulosa cells undergoing luteinization during ovulation in rats. Endocrinology 2013. [PMID: 23183184 DOI: 10.1210/en.2012-1610] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The ovulatory LH surge induces rapid up-regulation of steroidogenic acute regulatory (StAR) protein and rapid down-regulation of aromatase (Cyp19a1) in granulosa cells (GCs) undergoing luteinization during ovulation. This study investigated in vivo whether epigenetic mechanisms including histone modifications are involved in the rapid changes of StAR and Cyp19a1 gene expression. GCs were obtained from rats treated with equine chorionic gonadotropin (CG) before (0 h) and after human (h)CG injection. StAR mRNA levels rapidly increased after hCG injection, reached a peak at 4 h, and then remained higher compared with 0 h until 12 h. Cyp19a1 mRNA levels gradually decreased after hCG injection and reached their lowest level at 12 h. A chromatin immunoprecipitation assay revealed that levels of histone-H4 acetylation (Ac-H4) and trimethylation of histone-H3 lysine-4 (H3K4me3) increased whereas H3K9me3 and H3K27me3 decreased in the StAR promoter after hCG injection. On the other hand, the levels of Ac-H3 and -H4 and H3K4me3 decreased, and H3K27me3 increased in the Cyp19a1 promoter after hCG injection. Chromatin condensation, which was analyzed using deoxyribonuclease I, decreased in the StAR promoter and increased in the Cyp19a1 promoter after hCG injection. A chromatin immunoprecipitation assay also showed that binding activities of CAATT/enhancer-binding protein β to the StAR promoter increased and binding activities of phosphorylated-cAMP response element binding protein to the Cyp19a1 promoter decreased after hCG injection. These results provide in vivo evidence that histone modifications are involved in the rapid changes of StAR and Cyp19a1 gene expression by altering chromatin structure of the promoters in GCs undergoing luteinization during ovulation.
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Affiliation(s)
- Lifa Lee
- Department of Obstetrics and Gynecology, Yamaguchi University Graduate School of Medicine, Minamikogushi 1-1-1, Ube 755-8505, Japan
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16
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Abstract
In mammalian testes, aromatase irreversibly converts androgens (C19 steroid) into estrogens (C18) and is present in the endoplasmic reticulum of numerous tissues. In purified adult rat germ cells (pachytene spermatocytes and round spermatids) we have shown the presence of a functional aromatase (transcript, protein and biological activity) and the estrogen production is roughly identical to that of Leydig cells. In addition, transcripts of aromatase varied according to the germ cell type and the stages of seminiferous epithelium in an adult rat. In contrast with the androgen receptors mainly localized in somatic cells, estrogen receptors (ERs) are described in all testicular cells. Moreover, besides the presence of high affinity ERα and ERβ a rapid membrane effects have been recently reported and we demonstrated that GPR30 (a transmembrane intracellular estrogen receptor) was expressed in adult rat pachytene spermatocytes and in round spermatids. Thus estrogens through both GPR30 and genomic effects are able to activate the rapid signaling cascade, which in turn triggers an apoptotic mitochondrial pathway (via an increase in Bax expression) and a concomitant decrease of cyclin A1 and B1 gene levels as well as in controlling apoptosis and maturation/differentiation of round spermatids. Hence, the role of estrogen (either intracrine, paracrine or autocrine) in spermatogenesis (proliferation, apoptosis, survival and maturation) is now obvious taking into account the simultaneous presence of a biologically active aromatase and the widespread distribution of estrogen receptors especially during the spermiogenesis steps.
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Abstract
Aromatase that irreversibly transforms androgens into estrogens is present in the smooth endoplasmic reticulum of nearly all cell types in the mammalian testis. In rodents, all testicular cells except for myoid cells express aromatase activity. We have demonstrated the presence of the functional aromatase (transcript or protein, and biological activity) in adult rat germ cells including pachytene spermatocytes and round spermatids. We have also demonstrated estrogen output from these cells equivalent to that of Leydig cells. Unlike androgen receptors, which are localized mainly in testicular somatic cells, estrogen receptors are present in both somatic and germ cells in the testis. Moreover, we have recently described the rapid membrane effects of estrogens (via G protein-coupled receptor [GPER]) in purified rat germ cells. On the basis of various experimental models, in vitro studies and clinical data, it can be concluded that estrogens play an essential role in male reproduction, specifically in the development of spermatozoa.
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Affiliation(s)
- Serge Carreau
- University of Caen Basse-Normandie, Esplanade de la Paix-14032, CAEN Cedex, France.
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18
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Zhang Y, Zhang S, Zhou W, Ye X, Ge W, Cheng CHK, Lin H, Zhang W, Zhang L. Androgen rather than estrogen up-regulates brain-type cytochrome P450 aromatase (cyp19a1b) gene via tissue-specific promoters in the hermaphrodite teleost ricefield eel Monopterus albus. Mol Cell Endocrinol 2012; 350:125-35. [PMID: 22178793 DOI: 10.1016/j.mce.2011.12.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 12/01/2011] [Accepted: 12/02/2011] [Indexed: 11/30/2022]
Abstract
CYP19A1 in the brain and pituitary of vertebrates is important for reproductive and non-reproductive processes. In teleosts, it is broadly accepted that estradiol (E(2)) up-regulates cyp19a1b gene via a positive autoregulatory loop. Our present study, however, showed that E(2) did not up-regulate ricefield eel cyp19a1b in the hypothalamus and pituitary, whereas dihydrotestosterone (DHT) or testosterone (T) stimulated cyp19a1b expression only in the pituitary. Two tissue-specific promoters, namely promoter I and II directing the expression in the brain and pituitary respectively, were identified. Promoter I contained a non-consensus estrogen response element (ERE), and consequently did not respond to E(2). Promoter II contained an androgen response element (ARE) and consequently responded to DHT. Taken together, these results demonstrated a novel steroidal regulation of cyp19a1b gene expression and an alternative usage of tissue-specific cyp19a1b promoters in the brain and pituitary of a teleost species, the ricefield eel.
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Affiliation(s)
- Yang Zhang
- Department of Biology, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
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19
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Zanatta L, Bouraïma-Lelong H, Delalande C, Silva FRMB, Carreau S. Regulation of aromatase expression by 1α,25(OH)2 vitamin D3 in rat testicular cells. Reprod Fertil Dev 2011; 23:725-35. [DOI: 10.1071/rd10163] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Accepted: 01/27/2011] [Indexed: 11/23/2022] Open
Abstract
It is well known that the vitamin D endocrine system is involved in physiological and biochemical events in numerous tissues, especially gut, bone and kidney but also testis. Therefore, in this study the effect and mechanisms of action of 1α,25(OH)2 vitamin D3 (1,25D) on aromatase gene expression in immature rat Sertoli cells were evaluated. Vitamin D receptor transcripts were present in immature Sertoli cells as well as in adult testicular germ cells and somatic cells. The treatment of immature Sertoli cells with 100 nM 1,25D increased the amount of aromatase transcript, mainly in 30-day-old rats. The protein kinase A (PKA) blocker, H89, partially inhibited the 1,25D effect. The stimulation of aromatase gene expression in 30-day-old Sertoli cells by the agonist 1α,25(OH)2 lumisterol3, and the suppression of the 1,25D effect by the antagonists 1β,25(OH)2 vitamin D3 and (23S)-25-dehydro-1α (OH)-vitamin D3-26,23-lactone suggested, besides a genomic effect of 1,25D, the existence of non-genomic activation of the membrane-bound vitamin D receptor involving the PKA pathway.
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20
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O'Grady SP, Caprau D, Ke XR, Contreras Y, Haley S, Ermini F, Penn A, Moyer-Mileur L, McKnight R, Lane R. Intrauterine growth restriction alters hippocampal expression and chromatin structure of Cyp19a1 variants. Syst Biol Reprod Med 2010; 56:292-302. [PMID: 20662593 DOI: 10.3109/19396368.2010.490871] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We evaluated the impact of uteroplacental insufficiency (UPI), and subsequent intrauterine growth restriction (IUGR), on serum testosterone and hippocampal expression of Cyp19a1 variants and aromatase in rats. Additionally, we determined UPI induced histone modification of the promoter regions of Cyp19a1 variants using chromatin immunoprecipitation. Cyp19a1 is the gene encoding the protein aromatase, that catalyzes the biosynthesis of estrogens from androgens and is necessary for masculinization of the brain. IUGR was induced via bilateral uterine artery. UPI increased serum testosterone in day of life 0 (D(0)) and day of life 21 (D(21)) IUGR males to 224% and 299% of control values, respectively. While there was no significant impact of UPI on testosterone in D(0) females, testosterone in D(21) IUGR females was 187% of controls. Cyp19a1 variant 1.f and variant II are expressed in the rat hippocampus at D(0) and D(21). UPI significantly reduced expression of Cyp19a1 variant 1.f in D(0) males, with no impact in females. Similarly at D(0), UPI reduced expression of aromatase, the protein encoded by Cyp19a1, in males. Dimethylation of H3K4 was increased in the promoter region of variant 1.f (P1.f) and trimethylation of H3K4 was decreased in the promoter region of variant II (PII). At D(21), dimethylation of H3K4 is significantly reduced in PII of IUGR males. We conclude that UPI increases serum testosterone and reduces Cyp19a1 variant 1.f expression in the hippocampus of D(0) IUGR males. Additionally, UPI alters the chromatin structure of CYP19a1 at both D(0) and D(21).
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Abstract
The role of oestrogens in male reproductive tract physiology has for a long time been a subject of debate. The testis produces significant amounts of oestrogenic hormones, via aromatase, and oestrogen receptors (ERs)alpha (ESR1) and ERbeta (ESR2) are selectively expressed in cells of the testis as well as the epididymal epithelium, depending upon species. This review summarizes the current knowledge concerning the presence and activity of aromatase and ERs in testis and sperm and the potential roles that oestrogens may have in mammalian spermatogenesis. Data show that physiology of the male gonad is in part under the control of a balance of androgens and oestrogens, with aromatase serving as a modulator.
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Affiliation(s)
- Serge Carreau
- Department of Biochemistry, University of Caen, EA 2608, USC 2006 INRA, IFR 146, 14032 Caen, France
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22
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Bouraïma-Lelong H, Vanneste M, Delalande C, Zanatta L, Wolczynski S, Carreau S. Aromatase gene expression in immature rat Sertoli cells: age-related changes in the FSH signalling pathway. Reprod Fertil Dev 2010; 22:508-15. [DOI: 10.1071/rd09168] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Accepted: 09/10/2009] [Indexed: 11/23/2022] Open
Abstract
Aromatase, the enzyme responsible for the transformation of androgens into oestrogens, is encoded by the cyp19 gene expressed in the testis. The aim of the present study was to analyse the evolution of aromatase gene expression under FSH control in rat Sertoli cells between 10 and 30 days post partum, corresponding to the end of the proliferative period of Sertoli cells, establishment of the blood–testis barrier and acquisition of the mature phenotype. The maximum stimulatory effect of FSH on aromatase gene expression was obtained in 20-day-old rat Sertoli cells, compared with cells from 10- and 30-day-old rats, in parallel with the differentiation of Sertoli cells. Using two effectors of the protein kinase A pathway (i.e. forskolin and dibutyryl-cAMP) revealed differential effects between cells from rats aged 20 and 30 days, implying the involvement of another signalling pathway. Experiments using the specific phosphatidylinositol 3-kinase (PI3-K) inhibitor LY294002 revealed that PI3-K is strongly involved in FSH-induced aromatase expression in Sertoli cells from both 20- and 30-day-old rats. In vivo, this decrease could be explained by a negative effect exerted by germ cells because, in coculture, aromatase gene expression in 20-day-old Sertoli cells is greatly diminished.
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Carreau S, Delalande C, Galeraud-Denis I. Mammalian sperm quality and aromatase expression. Microsc Res Tech 2009; 72:552-7. [DOI: 10.1002/jemt.20703] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Chow JDY, Simpson ER, Boon WC. Alternative 5'-untranslated first exons of the mouse Cyp19A1 (aromatase) gene. J Steroid Biochem Mol Biol 2009; 115:115-25. [PMID: 19500729 DOI: 10.1016/j.jsbmb.2009.03.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Revised: 03/24/2009] [Accepted: 03/26/2009] [Indexed: 10/20/2022]
Abstract
The human aromatase gene (CYP19A1) has eleven tissue-specific untranslated first exons, while only three have been described in the mouse Cyp19A1 namely brain-, ovary- and testis-specific exons 1. The present study aims to elucidate the complete structure of the mouse Cyp19A1 gene. We detected aromatase transcripts in mouse bone, aorta, hypothalamus, adipose, gonads and placenta, but not nulliparous mammary fat pad. BestFit algorithm analysis against the human CYP19A1 has identified ten putative first exons upstream of mouse Cyp19A1. Based on these putative sequences, we were able to design specific primers for RT-PCR and detected for the first time, the presence of exons I.4 and I.3 in murine fat and gonads, respectively. These are novel 5'UTRs of mouse Cyp19A1. Using RT-PCR and 5' RACE, we confirmed the expression of exon 1f in the hypothalamus and proximal exon P2 in the ovary. The testis-specific exon 1 begins 217bp further upstream than previously reported. Putative exons 2a, I.5, I.7, I.6 and I.2 were not detected in mouse tissues. Therefore, we showed that mouse Cyp19A1 contains more tissue-specific first exons than previously thought and displays a similar genomic organization to human CYP19A1.
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