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Li X, Zhu Y, Zhao T, Zhang X, Qian H, Wang J, Miao X, Zhou L, Li N, Ye L. Role of COX-2/PGE2 signaling pathway in the apoptosis of rat ovarian granulosa cells induced by MEHP. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 254:114717. [PMID: 36889213 DOI: 10.1016/j.ecoenv.2023.114717] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
OBJECTIVE MEHP, as the metabolite of DEHP, is a widely used environmental endocrine disruptor. Ovarian granulosa cells participate in maintaining the function of ovary and COX2/PGE2 pathway may regulate the function of granulosa cells. We aimed to explore how COX-2/PGE2 pathway affects cell apoptosis in ovarian granulosa cells caused by MEHP. METHODS Primary rat ovarian granulosa cells were treated with MEHP (0, 200, 250, 300 and 350 μM) for 48 h. Adenovirus was used for over-expression of COX-2 gene. The cell viability was tested with CCK8 kits. The apoptosis level was tested by flow cytometry. The levels of PGE2 were tested with ELISA kits. The expression levels of COX-2/PGE2 pathway related genes, ovulation-related genes and apoptosis-related genes, were measured with RT-qPCR and Western blot. RESULTS MEHP decreased the cell viability. After MEHP exposure, the cell apoptosis level increased. The level of PGE2 markedly decreased. The expression levels of COX-2/PGE2 pathway related genes, ovulation-related genes and anti-apoptotic genes decreased; the expression levels of pro-apoptotic genes increased. The apoptosis level was alleviated after over-expression of COX-2, and the level of PGE2 slightly increased. The expression levels of PTGER2 and PTGER4, and the levels of ovulation-related genes increased; the levels of pro-apoptotic genes decreased. CONCLUSION MEHP can cause cell apoptosis by down-regulating the levels of ovulation-related genes via COX-2/PGE2 pathway in rat ovarian granulosa cells.
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Affiliation(s)
- Xu Li
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Ying Zhu
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Tianyang Zhao
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Xueting Zhang
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Honghao Qian
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Jia Wang
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Xiaohan Miao
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Liting Zhou
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China
| | - Na Li
- Department of Tropical Diseases, The Second Affiliated Hospital of Hainan Medical University, Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Tropical Disease Control, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan 571199, China; Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China.
| | - Lin Ye
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, China.
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Yang M, Ji Y, Yong T, Liu T, Yang S, Guo S, Meng F, Han X, Liang Q, Cao X, Huang L, Du X, Huang A, Kong F, Zeng X, Bu G. Corticosterone stage-dependently inhibits progesterone production presumably via impeding the cAMP-StAR cascade in granulosa cells of chicken preovulatory follicles. Poult Sci 2022; 102:102379. [PMID: 36608454 PMCID: PMC9829700 DOI: 10.1016/j.psj.2022.102379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 11/27/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022] Open
Abstract
Stress can suppress reproduction capacity in either wild or domestic animals, but the exact mechanism behind it, especially in terms of steroidogenesis, remains under-investigated so far. Considering the important roles of progesterone in avian breeding, we investigated the modulation of corticosterone on progesterone production in cultured granulosa cells of chicken follicles at different developmental stages. Using enzyme immunoassays, our study showed that corticosterone could only inhibit progesterone synthesis in granulosa cells from F5-6, F4, and F3 follicles, but not F2 and F1 follicles. Coincidentally, both quantitative real-time PCR and western blotting revealed that corticosterone could downregulate steroidogenic acute regulatory protein (StAR) expression, suggesting the importance of StAR in corticosterone-related actions. Using the dual-luciferase reporter system, we found that corticosterone can potentially enhance, rather than inhibit, the activity of StAR promoter. Of note, combining high-throughput transcriptomic analysis and quantitative real-time PCR, phosphodiesterase 10A (PDE10A), protein kinase cAMP-dependent type II regulatory subunit alpha (PRKAR2A) and cAMP responsive element modulator (CREM) were identified to exhibit the differential expression patterns consistent with cAMP blocking in granulosa cells from F5-6, F4, and F3, but not F2 and F1 follicles. Afterward, the expression profiles of these genes in granulosa cells of distinct developmental-stage follicles were examined by quantitative real-time PCR, in which all of them expressed correspondingly with progesterone levels of granulosa cells during development. Collectively, these findings indicate that corticosterone can stage-dependently inhibit progesterone production in granulosa cells of chicken preovulatory follicles, through impeding cAMP-induced StAR activity presumptively.
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Affiliation(s)
- Ming Yang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Yu Ji
- Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Tao Yong
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Tuoyuan Liu
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Shuai Yang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Shasha Guo
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Fengyan Meng
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Xingfa Han
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Qiuxia Liang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Xiaohan Cao
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Linyan Huang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Xiaogang Du
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Anqi Huang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Fanli Kong
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Xianyin Zeng
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China
| | - Guixian Bu
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China,Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an 625014, PR China,Corresponding author:
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Xiao H, Xu Z, Zhu X, Wang J, Zheng Q, Zhang Q, Xu C, Tao W, Wang D. Cortisol safeguards oogenesis by promoting follicular cell survival. SCIENCE CHINA. LIFE SCIENCES 2022; 65:1563-1577. [PMID: 35167018 DOI: 10.1007/s11427-021-2051-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/06/2021] [Indexed: 06/14/2023]
Abstract
The role of glucocorticoids in oogenesis remains to be elucidated. cyp11c1 encodes the key enzyme involved in the synthesis of cortisol, the major glucocorticoid in teleosts. In our previous study, we mutated cyp11c1 in tilapia and analyzed its role in spermatogenesis. In this study, we analyzed its role in oogenesis. cyp11c1+/- XX tilapia showed normal ovarian morphology but poor egg quality, as indicated by the mortality of embryos before 3 d post fertilization, which could be partially rescued by the supplement of exogenous cortisol to the mother fish. Transcriptome analyses revealed reduced expression of maternal genes in the eggs of the cyp11c1+/- XX fish. The cyp11c1-/- females showed impaired vitellogenesis and arrested oogenesis due to significantly decreased serum cortisol. Further analyses revealed decreased serum E2 level and expression of amh, an important regulator of follicular cell development, and increased follicular cell apoptosis in the ovaries of cyp11c1-/- XX fish, which could be rescued by supplement of either exogenous cortisol or E2. Luciferase assays revealed a direct regulation of cortisol and E2 on amh transcription via GRs or ESRs. Taken together, our results demonstrate that cortisol safeguards oogenesis by promoting follicular cell survival probably via Amh signaling.
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Affiliation(s)
- Hesheng Xiao
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Zhen Xu
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Xi Zhu
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Jingrong Wang
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Qiaoyuan Zheng
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Qingqing Zhang
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Chunmei Xu
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Wenjing Tao
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China.
| | - Deshou Wang
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University, Chongqing, 400715, China.
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Yang M, Jin C, Cheng X, Liu T, Ji Y, Meng F, Han X, Liang Q, Cao X, Huang L, Du X, Zeng X, Bu G. Corticosterone triggers anti-proliferative and apoptotic effects, and downregulates the ACVR1-SMAD1-ID3 cascade in chicken ovarian prehierarchical, but not preovulatory granulosa cells. Mol Cell Endocrinol 2022; 552:111675. [PMID: 35577112 DOI: 10.1016/j.mce.2022.111675] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 05/04/2022] [Accepted: 05/08/2022] [Indexed: 10/18/2022]
Abstract
The coordinated proliferation and apoptosis of granulosa cells plays a critical role in follicular development. To identify the exact mechanisms of how stress-driven glucocorticoid production suppresses reproduction, granulosa cells were isolated from chicken follicles at different developmental stages and then treated with corticosterone. Using CCK-8, EDU and TUNEL assays, we showed that corticosterone could trigger both anti-proliferative and pro-apoptotic effects in granulosa cells from 6 to 8 mm follicles only, while depicting no influence on granulosa cells from any preovulatory follicles. High-throughput transcriptomic analysis identified 1362 transcripts showing differential expression profiles in granulosa cells from 6 to 8 mm follicles after corticosterone treatment. Interestingly, Kyoto Encyclopedia of Genes and Genomes enrichment analysis revealed that 17 genes were enriched in the TGF-β signaling pathway, and 13 showed differential expression patterns consistent with corticosterone-induced effects. The differential expression profiles of these 13 genes were examined by quantitative real-time PCR in cultured chicken ovarian granulosa cells at diverse developmental stages following corticosterone challenge for a short (8 h) or long period (24 h). After 24 h of treatment, INHBB, FST, FMOD, NOG, ACVR1, SMAD1 and ID3 were the genes that responded consistently with corticosterone-induced proliferative and apoptotic events in all granulosa cells detected. However, only ACVR1, SMAD1 and ID3 could initiate coincident expression patterns after being treated for 8 h, suggesting their significance in corticosterone-mediated actions. Collectively, these findings indicate that corticosterone can inhibit proliferation and cause apoptosis in chicken ovarian prehierarchical, but not preovulatory granulosa cells, through impeding ACVR1-SMAD1-ID3 signaling presumptively.
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Affiliation(s)
- Ming Yang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Chenchen Jin
- Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Xinyue Cheng
- Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Tuoyuan Liu
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Yu Ji
- Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Fengyan Meng
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Xingfa Han
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Qiuxia Liang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Xiaohan Cao
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Linyan Huang
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Xiaogang Du
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China
| | - Xianyin Zeng
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China.
| | - Guixian Bu
- Isotope Research Laboratory, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China; Department of Bio-engineering and Applied Biology, College of Life Science, Sichuan Agricultural University, Xinkang Road, Ya'an, 625014, PR China.
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Brkic Z, Zivanovic A, Adzic M. Sex-specific Effects of Lipopolysaccharide on Hippocampal Mitochondrial Processes in Neuroinflammatory Model of Depression. Neuroscience 2020; 451:174-183. [PMID: 33039525 DOI: 10.1016/j.neuroscience.2020.09.059] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 09/14/2020] [Accepted: 09/29/2020] [Indexed: 11/25/2022]
Abstract
Mitochondria play a significant role in pathogenesis of clinical depression and their function can be impaired by inflammation and alterations in hypothalamic-pituitary-adrenal axis. Sexual context is also a relevant factor in the incidence of mood disorders, and could have a strong influence during an immune challenge. Therefore, in this study we investigated whether the effects of seven-day lipopolysaccharide (LPS) treatment on glucocorticoid receptor (GR) could be associated with apoptosis and alterations in energy metabolism in hippocampus of female and male Wistar rats with depressive-like behavior. To that end, we measured the mitochondrial levels of GR and its phosphoisoforms pGR232 and pGR246 in hippocampus of female and male rats, as well as the mRNA levels of two GR-regulated mitochondrial genes, cyclooxygenase -1 and -3 (COX-1 and -3). We also measured alterations in the extrinsic and intrinsic apoptotic pathways in mitochondria and cytosol of hippocampus of these animals, and the levels of cleaved cytosolic poly [ADP-ribose] polymerase-1 (PARP-1) protein. We discovered that even though LPS treatment induced behavioral alterations and affected corticosterone levels and apoptosis in a similar manner in both sexes, it affected mitochondrial GR differently in males and females. Namely, the treatment decreased levels of mitochondrial GR and pGR232/pGR246 ratio only in females, and these alterations were followed by decreased mRNA levels of COX-1 and COX-3 only in this sex. The alterations in COX-1 and COX-3 mRNA levels could indicate impaired oxidative metabolism and diminished mitochondrial function in hippocampus of this sex.
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Affiliation(s)
- Zeljka Brkic
- Department of Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, University of Belgrade, Serbia.
| | - Ana Zivanovic
- Department of Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, University of Belgrade, Serbia
| | - Miroslav Adzic
- Department of Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, University of Belgrade, Serbia
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Effects of dexamethasone on growth, viability and ultrastructure of bovine secondary follicles cultured in vitro. ZYGOTE 2020; 28:504-510. [PMID: 32847639 DOI: 10.1017/s0967199420000416] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
This study aimed to evaluate the effects of dexamethasone on development, viability, antrum formation and ultrastructural integrity of bovine secondary follicles cultured in vitro for 18 days. Bovine ovaries were obtained from slaughterhouses and secondary follicles of ~150-200 µm diameter were isolated and cultured in the laboratory in TCM-199+ alone or supplemented with different concentrations of dexamethasone (1, 10, 100 and 1000 ng/ml). Follicle viability was evaluated after the culture period, using calcein-AM (viable) and ethidium homodimer (nonviable). Follicle diameters and antrum formation were evaluated at days 0, 6, 12 and 18. Before or after in vitro culture, follicles were fixed for histological and ultrastructural analysis. Follicle diameters were evaluated using analysis of variance and Kruskal-Wallis test, while chi-squared test was used to evaluate the percentage of viable follicles and antrum formation (P < 0.05). Follicles cultured for 6 days with all treatments increased their diameters significantly, but there was no significant difference between treatments at the end of the culture period. In vitro cultured follicles showed antral cavity formation at the end of the culture period, but no influence of dexamethasone was seen. Ultrastructural analysis showed that follicles cultured with dexamethasone (1, 10, 100 and 1000 ng/ml) had well preserved granulosa cells. However, oocytes from follicles cultured with 10, 100 or 1000 ng/ml dexamethasone showed signs of degeneration. It can be concluded that follicles cultured in vitro in the presence of dexamethasone demonstrated continuous in vitro growth, but oocytes from follicles cultured with 10, 100 or 1000 ng/ml dexamethasone had poor ultrastructure.
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Perović M, Jović M, Todorović S, Đorđević AM, Milanović D, Kanazir S, Lončarević-Vasiljković N. Neuroprotective effects of food restriction in a rat model of traumatic brain injury - the role of glucocorticoid signaling. Nutr Neurosci 2020; 25:537-549. [PMID: 32476608 DOI: 10.1080/1028415x.2020.1769410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Traumatic brain injury (TBI) is one of the most common causes of neurological damage in young and middle aged people. Food restriction (FR) has been shown to act neuroprotectively in animal models of stroke and TBI. Indeed, our previous studies showed that FR attenuates inflammation, through suppression of microglial activation and TNF-α production, suppresses caspase-3-induced neuronal cell death and enhances neuroplasticity in the rat model of TBI. Glucocorticoids (GCs) play a central role in mediating both molecular and behavioral responses to food restriction. However, the exact mechanisms of FR neuroprotection in TBI are still unclear. The goal of the present study was to examine whether FR exerts its beneficial effects by altering the glucocorticoid receptor (GR) signaling alone and/or together with other protective factors. METHODS To this end, we examined the effects of FR (50% of regular daily food intake for 3 months prior to TBI) on the protein levels of total GR, GR phosphoisoform Ser232 (p-GR) and its transcriptional activity, as well as 11β-HSD1, NFκB (p65) and HSP70 as factors related to the GR signaling. RESULTS Our results demonstrate that FR applied prior to TBI significantly changes p-GR levels, and it's transcriptional activity during the recovery period after TBI. Moreover, as a pretreatment, FR modulates other protective factors in response to TBI, such as 11β-HSD1, NF-κB (p65) and HSP70 that act in parallel with GR in it's anti-inflammatory and neuroprotective effects in the rat model of brain injury. CONCLUSION Our results suggest that prophylactic FR represents a potent non-invasive approach capable of changing GR signalling, together with other factors related to the GR signaling in the model of TBI.
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Affiliation(s)
- Milka Perović
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
| | - Milena Jović
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
| | - Smilja Todorović
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
| | - Aleksandra Mladenović Đorđević
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
| | - Desanka Milanović
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
| | - Selma Kanazir
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
| | - Nataša Lončarević-Vasiljković
- Department of Neurobiology, Institute for Biological Research 'Siniša Stanković' - National Institute of Republic of Serbia, University of Belgrade Belgrade, Serbia
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Mitochondrial signaling in inflammation-induced depressive behavior in female and male rats: The role of glucocorticoid receptor. Brain Res Bull 2019; 150:317-327. [PMID: 31251961 DOI: 10.1016/j.brainresbull.2019.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 06/19/2019] [Accepted: 06/20/2019] [Indexed: 12/15/2022]
Abstract
Mitochondrial dysfunction can result from the interplay between elevated inflammatory markers and alterations in hypothalamic-pituitary-adrenal (HPA) axis, and can contribute to pathogenesis of major depression. Therefore, in this study we investigated whether the effects of lipopolysaccharide (LPS) on glucocorticoid receptor (GR) could be associated with alterations in mitochondrial apoptotic signaling in the prefrontal cortex of male and female Wistar rats with depressive-like behavior. To that end, we measured LPS-induced alterations in the extrinsic and intrinsic apoptotic pathways in mitochondria and cytosol of PFC of female and male rats, as well as the levels of cleaved cytosolic PARP-1. We also measured the mitochondrial levels of GR and its phosphoisoforms pGR232 and pGR246, as well as the mRNA levels of two GR-regulated mitochondrial genes, COX-1 and COX-3. We discovered that although seven-day LPS treatment evoked depressive-like behavior and induced apoptosis in the PFC of both sexes, it affected apoptotic cascades in both sexes differently. In females the treatment initiated both intrinsic and extrinsic apoptotic cascade, while in males only intrinsic cascade was engaged. Alterations in intrinsic apoptotic pathway were more associated with GR alterations in males, where LPS treatment decreased levels of mitochondrial GR and increased pGR232/pGR246 ratio. Alterations in mitochondrial GR could be associated with changes in expression of genes involved in oxidative metabolism in the PFC of this sex, and could, in combination with elevated levels of BCL-2 and decreased levels of BAX detected in this cell fraction, mitigate the detrimental effect of LPS on mitochondria in male PFC.
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Yang CK, Tsai HD, Wu CH, Cho CL. The role of glucocorticoids in ovarian development of sleep deprived rats. Taiwan J Obstet Gynecol 2019; 58:122-127. [PMID: 30638465 DOI: 10.1016/j.tjog.2018.11.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/02/2018] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE Sleep deprivation (SD) adversely affects female reproductive function. In this study, we investigated the role of glucocorticoids in ovarian development in sleep deprived rats. MATERIALS AND METHODS Female rats were subjected to SD for 1-4 days. Concentrations of serum estradiol and corticosterone were assessed. Betamethasone (BET) and/or recombinant human follicle-stimulating hormone (FSH) were administered to 21-day-old female rats for 2 days to evaluate ovarian status for follicular development. Intact preantral follicles were mechanically dissected from the rat's ovaries and cultured for 72 h with or without FSH in the presence or absence of BET to evaluate follicular development. RESULTS SD led to a significant difference in serum estradiol concentrations between the sham and SD groups, and corticosterone concentrations were significantly elevated in groups with more than 2 days of SD (P < 0.05). FSH stimulated ovarian growth in immature rats, whereas BET inhibited ovarian development caused by the FSH treatment. Treatment of the preantral follicles with FSH induced an increase in both follicle size and follicular cell number, while follicular cell differentiation was accompanied by enhanced inhibin-α and connexin 43 expression. Inhibition of FSH-stimulated follicular growth through BET treatment exhibited a dose-dependent reciprocal trend; as the BET dose increased (0.001-1 μg/mL), preantral follicular growth decreased. This decrease was associated with a decrease in follicular cell numbers and suppression of a proliferating cell nuclear antigen, inhibin-α, and connexin 43 expression. CONCLUSION The findings suggest that the adverse effects of SD may inhibit follicular development during ovarian hyperstimulation by corticosterone elevation in rat.
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Affiliation(s)
- Chueh-Ko Yang
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC; Laboratory of Reproductive Medicine, Changhua Christian Hospital, Changhua, Taiwan, ROC.
| | - Horng-Der Tsai
- Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Taiwan, ROC
| | - Cheng-Hsuan Wu
- Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Taiwan, ROC
| | - Chung-Lung Cho
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC.
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Antoniassi JQ, Fochi RA, Góes RM, Vilamaior PSL, Taboga SR. Corticosterone influences gerbil (Meriones unguiculatus) prostatic morphophysiology and alters its proliferation and apoptosis rates. Int J Exp Pathol 2017; 98:134-146. [PMID: 28664583 PMCID: PMC5573771 DOI: 10.1111/iep.12232] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 03/30/2017] [Indexed: 12/24/2022] Open
Abstract
Glucocorticoids (GCs) are hormones that are widely used in medicine; but although side effects are generally recognised, little is known about the precise mechanisms that is implicated in many of these side effects. Furthermore, GCs are highly correlated with stress and behaviour disorders. This study evaluated the effects of the glucocorticoid corticosterone on the ventral prostate of the Mongolian gerbil. Male gerbils (Meriones unguiculatus) (n = 5) received intraperitoneal injections of saline or corticosterone in doses of 0.5 mg/kg/day and 1.5 mg/kg/day for 5 days; while some of the animals were killed immediately after the treatment, the others were killed 5 days after the treatment period. The data show that corticosterone influences the structure and functionality of this organ. This hormone has anti-proliferative and anti-apoptotic properties in the prostate. In addition, the frequencies of the androgen (AR), oestrogen (ERα, ERβ) and glucocorticoid (GR) receptors changed. The frequencies of AR, GR and ERβ decreased in the Ct1/5 group; in the groups with rest period, the frequencies of GR increased and ERβ decreased in the epithelium. Changes in the proliferative index, apoptotic index and receptor activity may have contributed to the emergence of prostatic morphological alterations, such as the presence of cellular debris and inflammatory cells. Different doses of corticosterone had variable effects on the prostate, with a higher dose showing subtler effects and a lower dose showing more striking effects. The corticosterone effects on nuclear receptors were reverted or attenuated after a rest period, which was not observed for proliferation and apoptosis. In summary, we have demonstrated that corticosterone might influence the prostatic morphophysiology and that these changes may be linked in some way to the altered receptor distribution.
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Affiliation(s)
- Julia Quilles Antoniassi
- Department of Structural and Functional BiologyInstitute of BiologyState University of Campinas (UNICAMP)São PauloBrazil
| | - Ricardo Alexandre Fochi
- Department of BiologyInstitute of Biosciences, Humanities and Exact Sciences (IBILCE)University Estadual Paulista (UNESP)São PauloBrazil
| | - Rejane Maira Góes
- Department of BiologyInstitute of Biosciences, Humanities and Exact Sciences (IBILCE)University Estadual Paulista (UNESP)São PauloBrazil
| | - Patricia Simone Leite Vilamaior
- Department of BiologyInstitute of Biosciences, Humanities and Exact Sciences (IBILCE)University Estadual Paulista (UNESP)São PauloBrazil
| | - Sebastião Roberto Taboga
- Department of Structural and Functional BiologyInstitute of BiologyState University of Campinas (UNICAMP)São PauloBrazil
- Department of BiologyInstitute of Biosciences, Humanities and Exact Sciences (IBILCE)University Estadual Paulista (UNESP)São PauloBrazil
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11
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Scarlet D, Ille N, Ertl R, Alves BG, Gastal GDA, Paiva SO, Gastal MO, Gastal EL, Aurich C. Glucocorticoid metabolism in equine follicles and oocytes. Domest Anim Endocrinol 2017; 59:11-22. [PMID: 27866059 DOI: 10.1016/j.domaniend.2016.10.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/30/2016] [Accepted: 10/23/2016] [Indexed: 10/20/2022]
Abstract
The objective of this study was to determine whether (1) systemic and intrafollicular cortisol concentrations in horses are directly related and (2) supraphysiological levels of glucocorticoids affect in vitro maturation (IVM) rates of oocytes. Specifically, we studied the (1) changes in the intrafollicular cortisol and progesterone in context with granulosa cell gene expression during maturation of equine follicles (from 5-9 mm, 10-14 mm, 15-19 mm, 20-24 mm, and ≥25 mm in diameter) and (2) effects of cortisol supplementation on IVM rates and gene expression of equine cumulus-oocyte complexes (COCs). For these purposes, follicular fluid, granulosa cells, and COCs were collected from 12 mares (mean age 8.6 ± 0.5 yr) by transvaginal aspiration. Cortisol and progesterone concentrations in follicular fluid from follicles ≥25 mm were greater (P < 0.05) than in all other follicle classes and were positively correlated (r = 0.8; P < 0.001). Plasma concentrations of cortisol and progesterone did not differ before and after follicle aspiration (P > 0.05). In granulosa cells, gene expression of NR3C1, HSD11B1, HSD11B2, and CYP21A2 did not differ (P > 0.05) among different follicle classes. Maturation rates were similar (P > 0.05) among groups, regardless of the cortisol concentration in the IVM medium. In cumulus cells, messenger RNA expression of genes involved in glucocorticoid mechanism and apoptosis was either increased (NR3C1 and BCL2) or decreased (HSD11B2) by treatment (P < 0.01). In oocytes, gene expression of maturation markers (BMP15 and GDF9) was affected (P < 0.001) by cortisol treatment. This study demonstrates the involvement of glucocorticoids in follicle and oocyte maturation and cortisol modulation by HSD11B2 in equine COCs. Our data provide further information for understanding the normal ovarian endocrine physiology which might in turn also help improve equine assisted reproduction techniques.
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Affiliation(s)
- D Scarlet
- Division of Obstetrics, Gynecology and Andrology, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria.
| | - N Ille
- Center for Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria
| | - R Ertl
- Vetcore Facility, University of Veterinary Medicine Vienna, 1210 Vienna, Austria
| | - B G Alves
- Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL 62901, USA
| | - G D A Gastal
- Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL 62901, USA
| | - S O Paiva
- Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL 62901, USA
| | - M O Gastal
- Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL 62901, USA
| | - E L Gastal
- Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL 62901, USA
| | - C Aurich
- Center for Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria
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12
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Odermatt A, Strajhar P, Engeli RT. Disruption of steroidogenesis: Cell models for mechanistic investigations and as screening tools. J Steroid Biochem Mol Biol 2016; 158:9-21. [PMID: 26807866 DOI: 10.1016/j.jsbmb.2016.01.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 12/31/2015] [Accepted: 01/20/2016] [Indexed: 02/03/2023]
Abstract
In the modern world, humans are exposed during their whole life to a large number of synthetic chemicals. Some of these chemicals have the potential to disrupt endocrine functions and contribute to the development and/or progression of major diseases. Every year approximately 1000 novel chemicals, used in industrial production, agriculture, consumer products or as pharmaceuticals, are reaching the market, often with limited safety assessment regarding potential endocrine activities. Steroids are essential endocrine hormones, and the importance of the steroidogenesis pathway as a target for endocrine disrupting chemicals (EDCs) has been recognized by leading scientists and authorities. Cell lines have a prominent role in the initial stages of toxicity assessment, i.e. for mechanistic investigations and for the medium to high throughput analysis of chemicals for potential steroidogenesis disrupting activities. Nevertheless, the users have to be aware of the limitations of the existing cell models in order to apply them properly, and there is a great demand for improved cell-based testing systems and protocols. This review intends to provide an overview of the available cell lines for studying effects of chemicals on gonadal and adrenal steroidogenesis, their use and limitations, as well as the need for future improvements of cell-based testing systems and protocols.
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Affiliation(s)
- Alex Odermatt
- Swiss Center for Human Toxicology and Division of Molecular and Systems Toxicology, Department of Pharmaceutical Sciences, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland.
| | - Petra Strajhar
- Swiss Center for Human Toxicology and Division of Molecular and Systems Toxicology, Department of Pharmaceutical Sciences, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Roger T Engeli
- Swiss Center for Human Toxicology and Division of Molecular and Systems Toxicology, Department of Pharmaceutical Sciences, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
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Menoprogen, a TCM Herbal Formula for Menopause, Increases Endogenous E2 in an Aged Rat Model of Menopause by Reducing Ovarian Granulosa Cell Apoptosis. BIOMED RESEARCH INTERNATIONAL 2016; 2016:2574637. [PMID: 26981526 PMCID: PMC4769746 DOI: 10.1155/2016/2574637] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 01/12/2016] [Accepted: 01/17/2016] [Indexed: 01/15/2023]
Abstract
The effect of Menoprogen (MPG) on ovarian granulosa cell (GC) apoptosis was investigated in vitro and in vivo in an aged rat model of menopause. Intragastric administration of Menoprogen or estradiol valerate to 14-month-old senile female rats for eight weeks increased plasma E2 levels, as well as the weight of both ovarian and uterine tissues. Flow cytometric (FCM) analysis of isolated GCs from MPG-treated aged rats showed reductions in the G0/G1 ratio and apoptotic peaks. Isolated GCs also exhibited an increase in cell size and the number of cytoplastic organelles and intracellular gap junctions, the reappearance of secretory granules, and a lack of apoptotic bodies as determined by TEM. Results from a TdT-mediated dUTP nick end-labeling (TUNEL) assay revealed a reduction in TUNEL-positive GCs after MPG treatment. Immunohistochemical analysis showed a downregulation of proapoptotic Bax proteins and an upregulation of antiapoptotic Bcl-2 proteins. The addition of MPG-medicated serum to the media of cultured GCs also reduced cadmium chloride-induced apoptosis and downregulated caspase-3 protein expression. This work demonstrates that Menoprogen inhibits GC apoptosis in aged female rats and thereby increases E2 production. This represents a novel mechanism of action for this herbal medicine in the treatment of menopausal symptoms.
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14
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Effect of cortisol on bovine oocyte maturation and embryo development in vitro. Theriogenology 2015; 85:323-9. [PMID: 26456184 DOI: 10.1016/j.theriogenology.2015.08.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 07/25/2015] [Accepted: 08/21/2015] [Indexed: 01/25/2023]
Abstract
Glucocorticoids (GCs) are important mediators of key cellular events. Herein, we investigated the effect of adding cortisol to the IVM medium on the acquisition of developmental competency in bovine oocytes. Cortisol (0.01, 0.1, or 1 μg/mL) had no effect on cleavage rates or cell numbers of resulting blastocysts; however, supplementation with 0.1 μg/mL during IVM increased blastocyst rates of in vitro-fertilized bovine oocytes as compared to untreated controls (41 ± 10% vs. 21 ± 1.2%, P < 0.05, respectively). This concentration was chosen to assess changes in the relative expression of potential GC target genes. Oocytes matured in the presence of cortisol and their corresponding cumulus cells did not show changes in expression for genes analyzed as compared to untreated controls. Notably, blastocysts from oocytes matured in cortisol-supplemented medium expressed higher relative levels of glucose transporter 1 (GLUT1), fatty acid synthase (FASN), and heat shock protein 70 (HSP70). This study supports a role for cortisol in the acquisition of bovine oocyte competence. This is evidenced by increased blastocyst development rates and presumably related to elevated embryonic transcripts with roles in glucose and lipid metabolism, as well as the cellular response to stress.
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15
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Ayroldi E, Petrillo MG, Bastianelli A, Marchetti MC, Ronchetti S, Nocentini G, Ricciotti L, Cannarile L, Riccardi C. L-GILZ binds p53 and MDM2 and suppresses tumor growth through p53 activation in human cancer cells. Cell Death Differ 2014; 22:118-30. [PMID: 25168242 DOI: 10.1038/cdd.2014.129] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 07/16/2014] [Accepted: 07/21/2014] [Indexed: 12/31/2022] Open
Abstract
The transcription factor p53 regulates the expression of genes crucial for biological processes such as cell proliferation, metabolism, cell repair, senescence and apoptosis. Activation of p53 also suppresses neoplastic transformations, thereby inhibiting the growth of mutated and/or damaged cells. p53-binding proteins, such as mouse double minute 2 homolog (MDM2), inhibit p53 activation and thus regulate p53-mediated stress responses. Here, we found that long glucocorticoid-induced leucine zipper (L-GILZ), a recently identified isoform of GILZ, activates p53 and that the overexpression of L-GILZ in p53(+/+) HCT116 human colorectal carcinoma cells suppresses the growth of xenografts in mice. In the presence of both p53 and MDM2, L-GILZ binds preferentially to MDM2 and interferes with p53/MDM2 complex formation, making p53 available for downstream gene activation. Consistent with this finding, L-GILZ induced p21 and p53 upregulated modulator of apoptosis (PUMA) expression only in p53(+/+) cells, while L-GILZ silencing reversed the anti-proliferative activity of dexamethasone as well as expression of p53, p21 and PUMA. Furthermore, L-GILZ stabilizes p53 proteins by decreasing p53 ubiquitination and increasing MDM2 ubiquitination. These findings reveal L-GILZ as a regulator of p53 and a candidate for new therapeutic anti-cancer strategies for tumors associated with p53 deregulation.
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Affiliation(s)
- E Ayroldi
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - M G Petrillo
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - A Bastianelli
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - M C Marchetti
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - S Ronchetti
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - G Nocentini
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - L Ricciotti
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - L Cannarile
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
| | - C Riccardi
- Department Medicine, Section of Pharmacology, University of Perugia Medical School, Perugia, Italy
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16
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Santana PPB, Carvalho CMF, da Costa NN, Silva TVG, Ramos PCA, Cordeiro MS, Santos SSD, Khayat AS, Ohashi OM, Miranda MS. Effect of dexamethasone on development of in vitro-produced bovine embryos. Theriogenology 2014; 82:10-6. [PMID: 24656431 DOI: 10.1016/j.theriogenology.2014.02.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 02/05/2014] [Accepted: 02/15/2014] [Indexed: 11/15/2022]
Abstract
Studies in somatic cells have shown that glucocorticoids such as dexamethasone (DEX) may trigger or prevent apoptosis depending on the cell type in culture. Because the dysregulation of apoptosis may lower in vitro embryo production efficiency, we sought to investigate the effects of supplementing IVC medium with DEX (0.1 μg/mL) on embryo morphology, development kinetics, and apoptosis rates of in vitro-produced bovine preimplantation embryos. Embryo morphology was graded on Day 7, and development rates were assessed on Days 4 and 7 of IVC. Apoptosis was evaluated via annexin/propidium iodide staining under fluorescence microscopy where a cell labeled with annexin, propidium iodide, or both would be considered apoptotic. An embryo was counted in the apoptosis rates, if it displayed at least one such labeled cell. Although DEX supplementation did not reduce apoptosis rates, it had a positive impact on developmental kinetics and cell number both on Days 4 and 7 of embryo culture. Presumably, such effect resulted from increased cell proliferation rather than a direct inhibition of apoptosis. Further studies may evaluate the mechanisms by which glucocorticoids may affect embryo development, as DEX supplementation could become a tool to improve in vitro embryo yield in mammalian species.
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Affiliation(s)
- Priscila P B Santana
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil.
| | - Carla M F Carvalho
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - Nathália N da Costa
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - Thiago V G Silva
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - Priscilla C A Ramos
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - Marcela S Cordeiro
- Federal Institute of Education, Science and Technology of Pará, Abaetetuba, Para, Brazil
| | - Simone S D Santos
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - André S Khayat
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - Otávio M Ohashi
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
| | - Moysés S Miranda
- Institute of Biological Sciences, Federal University of Pará, Belém, Para, Brazil
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17
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Gruver-Yates AL, Cidlowski JA. Tissue-specific actions of glucocorticoids on apoptosis: a double-edged sword. Cells 2013; 2:202-23. [PMID: 24709697 PMCID: PMC3972684 DOI: 10.3390/cells2020202] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 03/05/2013] [Accepted: 03/12/2013] [Indexed: 12/20/2022] Open
Abstract
First described for their metabolic and immunosuppressive effects, glucocorticoids are widely prescribed in clinical settings of inflammation. However, glucocorticoids are also potent inducers of apoptosis in many cell types and tissues. This review will focus on the established mechanisms of glucocorticoid-induced apoptosis and outline what is known about the apoptotic response in cells and tissues of the body after exposure to glucocorticoids. Glucocorticoid-induced apoptosis affects the skeletal system, muscular system, circulatory system, nervous system, endocrine system, reproductive system, and the immune system. Interestingly, several cell types have an anti-apoptotic response to glucocorticoids that is cytoprotective. Lastly, we will discuss the pro- and anti-apoptotic effects of glucocorticoids in cancers and their clinical implications.
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Affiliation(s)
- Amanda L Gruver-Yates
- Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, 111 T. W. Alexander Drive, Research Triangle Park, NC 27709, USA.
| | - John A Cidlowski
- Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, 111 T. W. Alexander Drive, Research Triangle Park, NC 27709, USA.
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19
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Herr I, Büchler MW, Mattern J. Glucocorticoid-mediated apoptosis resistance of solid tumors. Results Probl Cell Differ 2009; 49:191-218. [PMID: 19132324 DOI: 10.1007/400_2008_20] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
More than a quarter of a century ago, the phenomenon of glucocorticoid-induced apoptosis in the majority of hematological cells was first recognized. More recently, glucocorticoid-induced antiapoptotic signaling associated with apoptosis resistance towards cytotoxic therapy has been identified in cells of epithelial origin, most of malignant solid tumors and some other tissues. Despite these huge amounts of data demonstrating differential pro- and anti-apoptotic effects of glucocorticoids, the underlying mechanisms of cell type-specific glucocorticoid signaling are just beginning to be described. This review summarizes our present understanding of cell type-specific pro- and anti-apoptotic signaling induced by glucocorticoids. We shortly introduce mechanisms of glucocorticoid resistance of hematological cells. We highlight and discuss the emerging molecular evidence of a general induction of survival signaling in epithelial cells and carcinoma cells by glucocorticoids. We give a summary of our current knowledge of decreased proliferation rates in response to glucocorticoid pre- and combination treatment, which are suspicious to be involved not only in protection of normal tissues, but also in protection of solid tumors from cytotoxic effects of anticancer agents.
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Affiliation(s)
- Ingrid Herr
- Department of Surgery, University of Heidelberg, Germany.
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Komiyama J, Nishimura R, Lee HY, Sakumoto R, Tetsuka M, Acosta TJ, Skarzynski DJ, Okuda K. Cortisol is a suppressor of apoptosis in bovine corpus luteum. Biol Reprod 2008; 78:888-95. [PMID: 18218610 DOI: 10.1095/biolreprod.107.065656] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Glucocorticoid (GC) acts as a modulator of physiological functions in several organs. In the present study, we examined whether GC suppresses luteolysis in bovine corpus luteum (CL). Cortisol (an active GC) reduced the mRNA expression of caspase 8 (CASP8) and caspase 3 (CASP3) and reduced the enzymatic activity of CASP3 and cell death induced by tumor necrosis factor (TNF) and interferon gamma (IFNG) in cultured bovine luteal cells. mRNAs and proteins of GC receptor (NR3C1), 11beta-hydroxysteroid dehydrogenase type 1 (HSD11B1), and HSD11B2 were expressed in CL throughout the estrous cycle. Moreover, the protein expression and the enzymatic activity of HSD11B1 were high at the early and the midluteal stages compared to the regressed luteal stage. These results suggest that cortisol suppresses TNF-IFNG-induced apoptosis in vitro by reducing apoptosis signals via CASP8 and CASP3 in bovine CL and that the local increase in cortisol production resulting from increased HSD11B1 at the early and midluteal stages helps to maintain CL function by suppressing apoptosis of luteal cells.
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Affiliation(s)
- Junichi Komiyama
- Laboratory of Reproductive Endocrinology, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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Myers M, Lamont MC, van den Driesche S, Mary N, Thong KJ, Hillier SG, Duncan WC. Role of luteal glucocorticoid metabolism during maternal recognition of pregnancy in women. Endocrinology 2007; 148:5769-79. [PMID: 17872369 DOI: 10.1210/en.2007-0742] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The human corpus luteum (hCL) is an active, transient, and dynamic endocrine gland. It will experience extensive tissue and vascular remodeling followed by 1) demise of the whole gland without any apparent scarring or 2) maintenance of structural and functional integrity dependent on conceptus-derived human chorionic gonadotropin (hCG). Because cortisol has well-characterized roles in tissue remodeling and repair, we hypothesized that it may have a role in controlling luteal dissolution during luteolysis and would be locally produced toward the end of the luteal cycle. Glucocorticoid-metabolizing enzymes [11beta-hydroxysteroid dehydrogenase (11betaHSD) types 1 and 2] and the glucocorticoid receptor (GR) were assessed in hCL and cultures of luteinized granulosa cells (LGC) using immunofluorescence and quantitative RT-PCR. Furthermore, the effect of cortisol on steroidogenic cell survival and fibroblast-like cell activity was explored in vitro. The hCL expressed 11betaHSD isoenzymes in LGC and nuclear GR in several cell types. hCG up-regulated the expression and activity of 11betaHSD type 1 (P < 0.05) and down-regulated type 2 enzyme (P < 0.05) in vitro and tended to do the same in vivo. Cortisol increased the survival of LGC treated with RU486 (P < 0.05) and suppressed the activity of a proteolytic enzyme associated with luteolysis in fibroblast-like cells (P < 0.05). Our results suggest that, rather than during luteolysis, it is luteal rescue with hCG that is associated with increased local cortisol generation by 11betaHSD type 1. Locally generated cortisol may therefore act on the hCL through GR to have a luteotropic role in the regulation of luteal tissue remodeling during maternal recognition of pregnancy.
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Affiliation(s)
- Michelle Myers
- Obstetrics and Gynaecology, The Queen's Medical Research Institute Centre for Reproductive Biology, 47 Little France Crescent, Edinburgh, Scotland, United Kingdom.
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Moore M, Piazza A, Nolan Y, Lynch MA. Treatment with dexamethasone and vitamin D3 attenuates neuroinflammatory age-related changes in rat hippocampus. Synapse 2007; 61:851-61. [PMID: 17621647 DOI: 10.1002/syn.20433] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Among the changes which occur in the brain with age is an increase in hippocampal concentration of proinflammatory cytokines like interleukin-1beta (IL-1beta) and an increase in IL-1beta-induced signaling. Here we demonstrate that the increase in IL-1beta concentration is accompanied by an increase in expression of IL-1 type I receptor (IL-1RI) and an age-related increase in microglial activation, as shown by increased expression of the cell surface marker, major histocompatibility complex II (MHCII) and increased MHCII staining. The evidence indicates that these age-related changes were abrogated in hippocampus of aged rats treated with dexamethasone and vitamin D3. Similarly, the age-related increases in activation of the stress-activated protein kinase, c-Jun N-terminal kinase (JNK), as well as caspase-3 and PARP were all attenuated in hippocampal tissue prepared from rats that received dexamethasone and vitamin D3. The data indicate that dexamethasone and vitamin D3 ameliorated the age-related increase in IFNgamma and suggest that IFNgamma may be the trigger leading to microglial activation, since it increases MHCII mRNA and IL-1beta release from cultured glia. In parallel with its ability to decrease microglial activation in vivo, we report that treatment of cultured glia with dexamethasone and vitamin D3 blocked the lipopolysaccharide increased MHCII mRNA and IL-1beta concentration, while the IL-1beta-induced increases in activation of JNK and caspase 3 in cultured neurons were also reversed by treatment with dexamethasone and vitamin D3. The data suggest that the antiinflammatory effect of dexamethasone and vitamin D3 derives from their ability to downreguate microglial activation.
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Affiliation(s)
- Michelle Moore
- Physiology Department, Trinity College Institute for Neuroscience, Trinity College, Dublin 2, Ireland
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Leandro CG, Castro RMD, Nascimento E, Pithon-Curi TC, Curi R. Mecanismos adaptativos do sistema imunológico em resposta ao treinamento físico. REV BRAS MED ESPORTE 2007. [DOI: 10.1590/s1517-86922007000500012] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
O treinamento físico, de intensidade moderada, melhora os sistemas de defesa, enquanto que o treinamento intenso causa imunossupressão. Os mecanismos subjacentes estão associados à comunicação entre os sistemas nervoso, endócrino e imunológico, sugerindo vias autonômicas e modulação da resposta imune. Células do sistema imune, quando expostas a pequenas cargas de estresse, desenvolvem mecanismo de tolerância. Em muitos tecidos tem-se demonstrado que a resposta a situações agressivas parece ser atenuada pelo treinamento físico aplicado previamente, isto é, o treinamento induz tolerância para situações agressivas/estressantes. Nesta revisão são relatados estudos sugerindo os mecanismos adaptativos do sistema imunológico em resposta ao treinamento físico.
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Amaral JD, Solá S, Steer CJ, Rodrigues CP. Function of nuclear steroid receptors in apoptosis: role of ursodeoxycholic acid. Expert Rev Endocrinol Metab 2007; 2:487-501. [PMID: 30290423 DOI: 10.1586/17446651.2.4.487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Nuclear steroid receptors such as the glucocorticoid and the mineralocorticoid receptors modulate apoptosis in different cell types through transactivation-dependent and -independent mechanisms. They are involved in both the induction and prevention of apoptosis depending on cell type. However, it is unclear how nuclear steroid receptors can affect expression of the same gene in opposing ways for different cells. In addition to their function as modulators of gene expression, nuclear steroid receptors often act as nuclear transporters of other regulatory molecules, thus indirectly regulating several apoptosis-related genes. Curiously, nuclear steroid receptors are thought to cooperate with the antiapoptotic endogenous bile acid, ursodeoxycholic acid, to prevent programmed cell death. The next decade will almost certainly unveil the remarkable role of nuclear steroid receptors in modulating the life and death struggle of cells and organ systems in human development and function.
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Affiliation(s)
- Joana D Amaral
- a Research Institute for Medicines & Pharmaceutical Sciences, Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal.
| | - Susana Solá
- b Research Institute for Medicines & Pharmaceutical Sciences, Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal.
| | - Clifford J Steer
- c Departments of Medicine, & Genetics, Cell Biology, & Development, University of Minnesota Medical School, Minneapolis, MN, USA.
| | - Cecília P Rodrigues
- d Research Institute for Medicines & Pharmaceutical Sciences, Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal.
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Herr I, Gassler N, Friess H, Büchler MW. Regulation of differential pro- and anti-apoptotic signaling by glucocorticoids. Apoptosis 2007; 12:271-91. [PMID: 17191112 DOI: 10.1007/s10495-006-0624-5] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
More than a quarter of a century ago, the phenomenon of glucocorticoid-induced apoptosis in the majority of hematological cells was first recognized. More recently, glucocorticoid-induced antiapoptotic signaling associated with apoptosis resistance has been identified in cells of epithelial origin, most of malignant solid tumors and some other tissues. Despite these huge amount of data demonstrating differential pro- and anti-apoptotic effects of glucocorticoids, the underlying mechanisms of cell type specific glucocorticoid signaling are just beginning to be described. This review summarizes our present understanding of cell type-specific pro- and anti-apoptotic signaling induced by glucocorticoids. In the first section we give a summary and update of known glucocorticoid-induced pathways mediating apoptosis in hematological cells. We shortly introduce mechanisms of glucocorticoid resistance of hematological cells. We highlight and discuss the emerging molecular evidence of a general induction of survival signaling in epithelial cells and carcinoma cells by glucocorticoids. We provide a model for glucocorticoid-induced resistance in cells growing in a tissue formation. Thus, attachment to the extracellular matrix and cell-cell contacts typical for e.g. epithelial and tumor cells may be crucially involved in switching the balance of several interacting pathways to survival upon treatment with glucocorticoids.
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Affiliation(s)
- Ingrid Herr
- Department of Surgery, University of Heidelberg, Heidelberg, Germany.
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26
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Harms C, Albrecht K, Harms U, Seidel K, Hauck L, Baldinger T, Hübner D, Kronenberg G, An J, Ruscher K, Meisel A, Dirnagl U, von Harsdorf R, Endres M, Hörtnagl H. Phosphatidylinositol 3-Akt-kinase-dependent phosphorylation of p21(Waf1/Cip1) as a novel mechanism of neuroprotection by glucocorticoids. J Neurosci 2007; 27:4562-71. [PMID: 17460069 PMCID: PMC6672985 DOI: 10.1523/jneurosci.5110-06.2007] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The role of glucocorticoids in the regulation of apoptosis remains incongruous. Here, we demonstrate that corticosterone protects neurons from apoptosis by a mechanism involving the cyclin-dependent kinase inhibitor p21(Waf1/Cip1). In primary cortical neurons, corticosterone leads to a dose- and Akt-kinase-dependent upregulation with enhanced phosphorylation and cytoplasmic appearance of p21(Waf1/Cip1) at Thr 145. Exposure of neurons to the neurotoxin ethylcholine aziridinium (AF64A) results in activation of caspase-3 and a dramatic loss of p21(Waf1/Cip1) preceding apoptosis in neurons. These effects of AF64A are reversed by pretreatment with corticosterone. Corticosterone-mediated upregulation of p21(Waf1/Cip1) and neuroprotection are completely abolished by glucocorticoid and mineralocorticoid receptor antagonists as well as inhibitors of PI3- and Akt-kinase. Both germline and somatically induced p21(Waf1/Cip1) deficiency abrogate the neuroprotection by corticosterone, whereas overexpression of p21(Waf1/Cip1) suffices to protect neurons from apoptosis. We identify p21(Waf1/Cip1) as a novel antiapoptotic factor for postmitotic neurons and implicate p21(Waf1/Cip1) as the molecular target of neuroprotection by high-dose glucocorticoids.
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Affiliation(s)
- Christoph Harms
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Katharina Albrecht
- Institut für Pharmakologie und Toxikologie, Charité Campus Mitte, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
| | | | - Kerstin Seidel
- Institut für Pharmakologie und Toxikologie, Charité Campus Mitte, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
| | - Ludger Hauck
- Max Delbrück Center for Molecular Medicine, D-13125 Berlin, Germany
| | - Tina Baldinger
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Denise Hübner
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Golo Kronenberg
- Klinik und Poliklinik für Neurologie
- Klinik und Poliklinik für Psychiatrie, Charité Campus Benjamin Franklin, D-14050 Berlin, Germany, and
| | - Junfeng An
- Max Delbrück Center for Molecular Medicine, D-13125 Berlin, Germany
| | | | | | - Ulrich Dirnagl
- Abteilung für Experimentelle Neurologie, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
| | | | - Matthias Endres
- Klinik und Poliklinik für Neurologie
- Neurowissenschaftliches Forschungszentrum, and
| | - Heide Hörtnagl
- Institut für Pharmakologie und Toxikologie, Charité Campus Mitte, Charité–Universitätsmedizin Berlin, D-10117 Berlin, Germany
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27
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Engmann L, Losel R, Wehling M, Peluso JJ. Progesterone regulation of human granulosa/luteal cell viability by an RU486-independent mechanism. J Clin Endocrinol Metab 2006; 91:4962-8. [PMID: 16984987 DOI: 10.1210/jc.2006-1128] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT Progesterone (P4) inhibits human granulosa/luteal cell apoptosis by an unknown mechanism. OBJECTIVE Our objective was to assess the role of the nuclear P4 receptor (PGR) and PGR membrane component 1 (PGRMC1) in mediating P4's antiapoptotic action in human granulosa/luteal cells. DESIGN, SETTING, AND PATIENTS In vitro laboratory studies were designed in which human granulosa/luteal cells were harvested from in vitro fertilization patients from 2004-2006. MAIN OUTCOME MEASURE Apoptosis was assessed by terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling assays and DNA staining. Protein expression was observed by Western blot and immunocytochemistry. RESULTS PGR was detected in 20% of the human granulosa/luteal cells, and 25 and 50 microM RU486 induced at least 70% of the cells to undergo apoptosis. Five micromolar RU486 neither induced apoptosis nor attenuated the antiapoptotic action of 1 microM P4. PGRMC1 and its binding partner, plasminogen activator inhibitor RNA-binding protein-1 (PAIRBP1), were detected in human granulosa/luteal cells. Antibodies to either PGRMC1 or PAIRBP1 completely attenuated P4's action. CONCLUSIONS PGR does not exclusively mediate P4's action because 1) 5 microM RU486 should have been able to override the antiapoptotic action of 1 microM P4 because RU486 binds to the PGR at a greater affinity than P4; 2) 25 and 50 microM RU486 induce three to four times more cells to undergo apoptosis than express PGR; 3) P4 must be continuously present to prevent apoptosis, which implies a rapid, possibly membrane-initiated mechanism of action; and 4) expression and blocking antibody studies suggest that PGRMC1 and PAIRBP1 account in part for P4's action in human granulosa/luteal cells.
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Affiliation(s)
- Lawrence Engmann
- Department of Obstetrics and Gynecology, University of Connecticut Health Center, Farmington, Connecticut 06030, USA
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28
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Piette C, Munaut C, Foidart JM, Deprez M. Treating gliomas with glucocorticoids: from bedside to bench. Acta Neuropathol 2006; 112:651-64. [PMID: 16855833 DOI: 10.1007/s00401-006-0100-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2006] [Revised: 06/09/2006] [Accepted: 06/09/2006] [Indexed: 02/07/2023]
Abstract
Glucocorticoids are used in the treatment of gliomas to decrease tumour-associated oedema and to reduce the risk of acute encephalopathy associated with radiotherapy. However, the mechanisms by which glucocorticoids work are still largely unknown. In this paper, we survey the experimental and clinical evidence for the effects of glucocorticoids on tumour cell proliferation, apoptosis and sensitivity to chemotherapy, angiogenesis and vascular permeability. We then review current guidelines on the choice of molecule, dose and duration of glucocorticoid treatment for gliomas.
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Affiliation(s)
- Caroline Piette
- Laboratoire de Biologie des Tumeurs et du Développement, Université de Liège, Liège, Belgium
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29
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Fru KN, VandeVoort CA, Chaffin CL. Mineralocorticoid Synthesis During the Periovulatory Interval in Macaques1. Biol Reprod 2006; 75:568-74. [PMID: 16837642 DOI: 10.1095/biolreprod.106.053470] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Ovulation and luteal formation in primates are associated with the sustained synthesis of progesterone. The observed high intrafollicular concentrations of progesterone during the periovulatory interval raise the possibility that this steroid serves as a precursor for mineralocorticoids. The aim of this study was to determine if mineralocorticoids are synthesized by the luteinizing macaque follicle during controlled ovarian stimulation cycles in which follicular fluid and granulosa cell aspirates were obtained before or after an ovulatory hCG bolus. Follicular fluid concentrations of progesterone and 17alpha-hydroxyprogesterone increased within 3 h of an ovulatory hCG bolus. Their respective metabolites, 11-deoxycorticosterone (DOC) and 11-deoxycortisol, were not detectable before an ovulatory stimulus and increased starting at 6 h after hCG, while corticosterone and aldosterone were undetectable. Cortisol was present before and after hCG administration and had increased 2-fold at 24 h after an ovulatory stimulus. The expression of 21-hydroxylase (CYP21A2) mRNA increased within 3 h of hCG administration, while 11beta-hydroxylase-1 (CYP11B1) and 11beta-hydroxylase-2 (CYP11B2) mRNAs were not detectable. 11beta-Hydroxysteroid dehydrogenase-1 (HSD11B1) mRNA had increased at 12 h after hCG administration, and 11beta-hydroxysteroid dehydrogenase-2 (HSD11B2) had decreased by 3 h after hCG administration. Mineralocorticoid receptor mRNA levels did not change following hCG administration, while glucocorticoid receptor mRNA levels increased in response to an ovulatory stimulus. Treatment of granulosa cells with the mineralocorticoid receptor antagonist spironolactone blocked hCG-induced progesterone synthesis in vitro. These data indicate that macaque granulosa cells can synthesize mineralocorticoids in response to an ovulatory stimulus and that the mineralocorticoid receptor plays a key role in steroid synthesis associated with luteinization of macaque granulosa cells.
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Affiliation(s)
- Karenne N Fru
- Department of Physiology, Medical College of Georgia, Augusta, Georgia 30912, USA
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30
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Ní Chonghaile T, Concannon CG, Szegezdi E, Gorman AM, Samali A. Dexamethasone inhibits apoptosis in C6 glioma cells through increased expression of Bcl-XL. Apoptosis 2006; 11:1247-55. [PMID: 16699951 DOI: 10.1007/s10495-006-7233-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The glucocorticoid dexamethasone (Dex) has been reported to modulate a number of signaling pathways and physiological processes, including apoptosis. This study was carried out to investigate the cytoprotective mechanism of Dex in C6 glioma cells. Pre-treatment of cells with Dex inhibited apoptosis induced by staurosporine, etoposide and thapsigargin. Apoptosis inhibition correlated with blockade of mitochondrial cytochrome c release, abolition of caspase-3 activity along with inhibition of caspase-9 and PARP cleavage. Dex-mediated cytoprotection coincided with the induction of the anti-apoptotic protein, Bcl-X(L). The specific glucocorticoid receptor antagonist, RU486, reversed the anti-apoptotic effect of Dex and prevented Bcl-X(L) induction. Here, we show for the first time that knockdown of Bcl-X(L) expression with siRNA reversed the protective effects of the glucocorticoid in glioma cells. We conclude that Dex-mediated inhibition of apoptosis in C6 glioma cells is through induction of Bcl-X(L).
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Affiliation(s)
- Tríona Ní Chonghaile
- Department of Biochemistry and National Centre for Biomedical Engineering Science, National University of Ireland, Galway, Ireland
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31
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Moore IMK, Merkle CJ, Miketova P, Salyer RK, Torres BJ, Schaeffer RC, Montgomery DW. Cytosine arabinoside induces programmed endothelial cell death through the caspase-3 pathway. Biol Res Nurs 2006; 7:289-96. [PMID: 16581899 DOI: 10.1177/1099800405286138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The anti-cancer effects of cytosine arabinoside (ARA-C) are well known. However, effects on nonmalignant cells have not been elucidated and may be important to understanding treatment-related toxicity. The purpose of this study was to examine the effect of ARA-C on nondividing vascular endothelial cells. The objectives were to determine the effects of ARA-C on cell viability and to ascertain whether ARA-C caused apoptosis in cultured vascular endothelial cells and hydrocortisone blunted caspase-3-induced apoptosis. Endothelial cells were cultured until confluent and mitotically quiescent then exposed to ARA-C (10(-7)to 10(-3) M) for 1 to 4 days. Some experiments involved cotreatment with hydrocortisone (10(-11),10(-10),10(-4), and 10(-3) M). Light microscopy and the colorimetric MTS assay were used to measure viability. Fluorescent annexin-V and DNA fragmentation assays were used to measure apoptosis, and a fluorescence-based enzymatic assay was used to measure caspase-3 activity, which is one pathway involved in the apoptosis cascade. Two-way ANOVA or the appropriate nonparametric test was used to determine statistical significance in studies of viability and apoptosis. Oneway ANOVA was used to determine statistical significance for caspase-3 activity. Viability was decreased with higher concentrations of ARA-C and increased days of treatment. The percentage of apoptotic cells increased with higher concentrations of ARA-C and increased days of treatment. ARA-C-treated samples showed DNA fragmentation, indicative of apoptosis. Caspase-3 activity increased after ARA-C addition; hydrocortisone blunted this increase. ARA-C caused apoptosis in nondividing endothelial cells in culture. Hydrocortisone may protect against ARA-C-induced apoptosis by reducing caspase-3 activity.
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Affiliation(s)
- Ida M Ki Moore
- College of Nursing, University of Arizona, Tucson 85721-0203, USA.
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32
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Ranta F, Avram D, Berchtold S, Düfer M, Drews G, Lang F, Ullrich S. Dexamethasone induces cell death in insulin-secreting cells, an effect reversed by exendin-4. Diabetes 2006; 55:1380-90. [PMID: 16644695 DOI: 10.2337/db05-1220] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Glucocorticoid excess induces hyperglycemia, which may result in diabetes. The present experiments explored whether glucocorticoids trigger apoptosis in insulin-secreting cells. Treatment of mouse beta-cells or INS-1 cells with the glucocorticoid dexamethasone (0.1 micromol/l) over 4 days in cell culture increased the number of fractionated nuclei from 2 to 7 and 14%, respectively, an effect that was reversed by the glucocorticoid receptor antagonist RU486 (1 micromol/l). In INS-1 cells, dexamethasone increased the number of transferase-mediated dUTP nick-end labeling-staining positive cells, caspase-3 activity, and poly-(ADP-) ribose polymerase protein cleavage; decreased Bcl-2 transcript and protein abundance; dephosphorylated the proapoptotic protein of the Bcl-2 family (BAD) at serine155; and depolarized mitochondria. Dexamethasone increased PP-2B (calcineurin) activity, an effect abrogated by FK506. FK506 (0.1 micromol/l) and another calcineurin inhibitor, deltamethrin (1 micromol/l), attenuated dexamethasone-induced cell death. The stable glucagon-like peptide 1 analog, exendin-4 (10 nmol/l), inhibited dexamethasone-induced apoptosis in mouse beta-cells and INS-1 cells. The protective effect of exendin-4 was mimicked by forskolin (10 micromol/l) but not mimicked by guanine nucleotide exchange factor with the specific agonist 8CPT-Me-cAMP (50 micromol/l). Exendin-4 did not protect against cell death in the presence of cAMP-dependent protein kinase (PKA) inhibition by H89 (10 micromol/l) or KT5720 (5 micromol/l). In conclusion, glucocorticoid-induced apoptosis in insulin-secreting cells is accompanied by a downregulation of Bcl-2, activation of calcineurin with subsequent dephosphorylation of BAD, and mitochondrial depolarization. Exendin-4 protects against glucocorticoid-induced apoptosis, an effect mimicked by forskolin and reversed by PKA inhibitors.
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Affiliation(s)
- Felicia Ranta
- Institut für Physiologie, University of Tübingen, Gmelinstrasse 5, D-72076 Tübingen, Germany
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Higuchi A, Shimmura S, Takeuchi T, Suematsu M, Tsubota K. Elucidation of apoptosis induced by serum deprivation in cultured conjunctival epithelial cells. Br J Ophthalmol 2006; 90:760-4. [PMID: 16531423 PMCID: PMC1860219 DOI: 10.1136/bjo.2005.088203] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND/AIMS The conjunctival epithelial cell line, CCL20.2 (CCL), requires the presence of 10% fetal calf serum (FCS) in the medium to survive. To elucidate the molecular mechanism underlying such cell death, including the death signal for these cells, the activities of several caspases in the CCL were measured, and the effects of caspase inhibitors and serum components on cell death were examined. METHODS CCL was grown in Medium 199 containing 10% FCS, and the medium was changed to Medium 199 with or without 10% FCS, or medium without 10% FCS but containing caspase inhibitors or serum components. After 24 hours' incubation, the enzyme activities of caspases 1, 3, 8, and 9 in the culture supernatants were measured, and the effects of caspase inhibitors and serum components-for example, growth factors, lactoferrin, retinoic acid, were investigated. RESULTS DNA fragmentation was induced by serum deprivation, confirming that serum deprivation induces apoptosis in CCL. While the activities of caspases 3 and 8 were found to be increased, those of caspases 1 and 9 were not detected in the apoptotic cells. Z-VAD completely suppressed the caspase 3 activation, and specific inhibitors of caspases 1, 8, and 9 partially suppressed the activation. Serum deprivation induced a decrease in the cellular viability, which, however, partially recovered in the presence of caspase inhibitors, epidermal growth factor and retinoic acid. CONCLUSION These results suggest that the apoptosis induced by serum deprivation involves caspases 1, 3, 8, and 9, and is suppressed by caspase inhibitors. EGF and retinoic acid have a key role in the maintenance of the ocular surface.
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Affiliation(s)
- A Higuchi
- PhD, 6N9 Research Park, Keio University, School of Medicine, 35 Shinano-Machi, Shinjyuku-Ku, Tokyo, 160-8582 Japan.
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34
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Seto-Young D, Leonardi O, Park A, Holcomb K, Salehi M, Chang P, Yih M, Rosenwaks Z, Poretsky L. Hormonally active nontransformed human ovarian cell culture from oophorectomy specimens: methods of development and initial characterization. HORMONE RESEARCH 2005; 64:238-47. [PMID: 16260896 DOI: 10.1159/000089349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2004] [Accepted: 07/25/2005] [Indexed: 11/19/2022]
Abstract
We repeatedly established a nontransformed steroidogenically active human ovarian cell culture derived from oophorectomy specimens. The cells maintained steroidogenic activity for 3-5 passages (6-8 weeks) and responded to stimulation by insulin and gonadotropin. With pregnenolone as substrate, LH stimulated progesterone production up to 124% and FSH up to 121%. Insulin alone stimulated progesterone production up to 135%, in the presence of LH up to 191%, and in the presence of FSH up to 170%. With dehydroisoandrosterone (DHA) as substrate, insulin alone stimulated testosterone production up to 117%, and in the presence of LH (but not FSH) up to 125%. With androstenedione as substrate, insulin alone stimulated estradiol production up to 133%, FSH alone up to 188%, and LH with insulin up to 217%. With progesterone as substrate and in the presence of LH (but not FSH), 17-alpha-hydroxylase activity was stimulated up to 131%. With DHA as substrate and in the presence of LH, 3-beta-hydroxysteroid dehydrogenase (3-beta-HSD) activity was stimulated up to 139%. With androstenedione as substrate, insulin alone stimulated aromatase activity up to 202%, LH up to 208%, and FSH up to 251%. Under the same conditions, in the presence of LH and insulin, aromatase activity was stimulated up to 342%, and in the presence of FSH and insulin, up to 318%. With testosterone as substrate, insulin alone stimulated aromatase activity up to 122%. With testosterone as substrate, in the presence of LH and insulin, aromatase activity was stimulated up to 136%, and in the presence of FSH and insulin, up to 156%. Immunocytochemistry studies directly confirmed presence of aromatase and 3-beta-HSD in these cultured cells. We conclude that a steroidogenically active nontransformed long-term human ovarian cell culture can be repeatedly established from oophorectomy specimens, providing uninterrupted supply of cultured human ovarian cells for a variety of studies of ovarian physiology.
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Affiliation(s)
- Donna Seto-Young
- Division of Endocrinology, Department of Medicine, Beth Israel Medical Center and Albert Einstein College of Medicine, NY 10003, USA
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35
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Gu G, Hentunen TA, Nars M, Härkönen PL, Väänänen HK. Estrogen protects primary osteocytes against glucocorticoid-induced apoptosis. Apoptosis 2005; 10:583-95. [PMID: 15909120 DOI: 10.1007/s10495-005-1893-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Glucocorticoid-induced osteoporosis may be at least in part due to the increased apoptosis of osteocytes. To study the role of osteocyte apoptosis in glucocorticoid-induced osteoporosis, we isolated primary osteocytes from murine calvaria for the analysis of the effects of dexamethasone in in vitro culture. The cells were identified by morphology, cytochemical staining, immunocytochemical staining and mRNA expression of phosphate-regulating gene with homology to endopeptidases on the X chromosome (PHEX) and sclerosteosis/van Buchem disease gene (SOST). We found that dexamethasone induced osteocyte apoptosis in a dose-dependent manner. A glucocorticoid receptor antagonist, mifepristone (RU486), suppressed dexamethasone-induced osteocyte apoptosis, suggesting that it was mediated by glucocorticoid receptor. Immunocytochemical stainings showed that glucocorticoid receptors are present in primary osteocytes, and they were translocated to nuclei after the exposure to dexamethasone. Addition of estrogen prevented glucocorticoid receptor translocation into nuclei. Corresponding antiapoptotic effects in primary osteocytes were also seen after the pretreatment of primary osteocytes with a picomolar concentration of estrogen. The pure antiestrogen ICI 182,780 inhibited estrogen effect on apoptosis induced by dexamethasone. These data suggest that glucocorticoid receptors play an important role in glucocorticoid-induced osteocyte apoptosis. Most importantly, estrogen has a protective effect against osteocyte apoptosis. To conclude, the mechanism of glucocorticoid-induced osteoporosis may be due to the apoptosis of osteocytes, which can be opposed by estrogen.
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Affiliation(s)
- G Gu
- Department of Anatomy, Institute of Biomedicine, University of Turku, Turku, Finland
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36
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Solá S, Castro RE, Kren BT, Steer CJ, Rodrigues CMP. Modulation of nuclear steroid receptors by ursodeoxycholic acid inhibits TGF-beta1-induced E2F-1/p53-mediated apoptosis of rat hepatocytes. Biochemistry 2004; 43:8429-38. [PMID: 15222754 DOI: 10.1021/bi049781x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have recently shown that both ursodeoxycholic acid (UDCA) and tauroursodeoxycholic acid (TUDCA) prevent transforming growth factor beta1 (TGF-beta1)-induced hepatocyte apoptosis by modulating the E2F-1/p53/Bax pathway. In addition, activation of glucocorticoid (GR) and mineralocorticoid receptors (MR) inhibits apoptosis in various systems. UDCA induces a ligand-independent activation of the GR, thus potentially regulating a number of targets. In this study, we investigated the role of GR and MR during TGF-beta1-induced hepatocyte apoptosis, and identified additional antiapoptotic targets for UDCA. Our results showed that in primary hepatocytes, TGF-beta1 induced 40-50% decreases in gr and mr mRNA expression (p < 0.01), together with up to 10-fold reductions in their protein levels (p < 0.01). Notably, pretreatment with UDCA resulted in a significant upregulation of nuclear steroid receptors (p < 0.05), which coincided with 2- and 3-fold increases in the level of GR and MR nuclear translocation, respectively, when compared with that of TGF-beta1 alone (p < 0.05). Similarly, TUDCA induced GR and MR nuclear translocations (p < 0.05) and markedly prevented MR protein changes associated with TGF-beta1 (p < 0.05) without affecting GR protein levels. Moreover, when interference RNA was used to inhibit GR and MR, UDCA no longer protected hepatocytes against TGF-beta1-induced apoptosis. In fact, the protective effect of UDCA in TGF-beta1-associated caspase activation decreased from 65 to <10% when GR or MR function was blocked. Finally, the TGF-beta1-induced E2F-1/Mdm-2/p53 apoptotic pathway, normally inhibited by UDCA, was not regulated by the bile acid after GR or MR silencing. These results demonstrate that UDCA protects against apoptosis through an additional pathway that involves nuclear receptors GR and MR as key factors. Further, the E2F-1/Mdm-2/p53 apoptotic pathway appears to be a prime target for UDCA-induced steroid receptor activation.
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Affiliation(s)
- Susana Solá
- Centro de Patogénese Molecular, Faculty of Pharmacy, University of Lisbon, Lisbon 1600-083, Portugal
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Sengupta S, Wasylyk B. Physiological and pathological consequences of the interactions of the p53 tumor suppressor with the glucocorticoid, androgen, and estrogen receptors. Ann N Y Acad Sci 2004; 1024:54-71. [PMID: 15265773 DOI: 10.1196/annals.1321.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The p53 tumor suppressor plays a key role in protection from the effects of different physiological stresses (DNA damage, hypoxia, transcriptional defects, etc.), and loss of its activity has dire consequences, such as cancer. Its activity is finely tuned through interactions with other important regulatory circuits in the cell. Recently, striking evidence has emerged for crosstalk with another class of important regulators, the steroid hormone receptors, and in particular the glucocorticoid (GR), androgen (AR), and estrogen (ER) receptors. These receptors are important in maintaining homeostasis in response to internal and external stresses (GR) and in the development, growth, and maintenance of the male and female reproductive systems (AR and ER, respectively). We review how p53 interacts closely with these receptors, to the extent that they share the same E3 ubiquitin ligase, the MDM2 oncoprotein. We discuss the different physiological contexts in which such interactions occur, and also how these interactions have been undermined in various pathological situations. We will describe future areas for research, with special emphasis on GR, and how certain common features, such as cytoplasmic anchoring of p53 by the receptors, may become targets for the development of therapeutic interventions. Given the importance of GR in inflammation, erythropoiesis, and autoimmune diseases, and the importance of AR and ER in prostate and breast cancer (respectively), the studies on p53 interactions with the steroid receptors will be an important domain in the near future.
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Affiliation(s)
- Sagar Sengupta
- Laboratory of Human Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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Sasson R, Shinder V, Dantes A, Land A, Amsterdam A. Activation of multiple signal transduction pathways by glucocorticoids: protection of ovarian follicular cells against apoptosis. Biochem Biophys Res Commun 2004; 311:1047-56. [PMID: 14623288 DOI: 10.1016/j.bbrc.2003.10.097] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We have recently demonstrated that glucocorticoids protect against serum-deprivation, cAMP-, TNFalpha-, and p53-induced apoptosis in ovarian follicular cells involved in up-regulation of Bcl-2. We demonstrated that dexamethasone, which enhances steroidogenesis by up-regulation of the p450scc enzyme system, stimulates the MAPK cascade by phosphorylation of ERK1, ERK2 as well as by Akt phosphorylation within 1-5min with no effect on p38 MAPK phosphorylation. Moreover, glucocorticoids enhance expression of connexin 43, formation of gap junctions, expression of cadherins, and formation of adherence junctions within 24h of hormone stimulation of ovarian granulosa cells. It is suggested that the protective effects of glucocorticoids against apoptosis are mediated by both genomic and non-genomic mechanisms. Moreover, for the first time we show that protein phosphorylation, cell-cell contact, and intracellular communication are important mediators in glucocorticoid protection against apoptosis in ovarian follicular cells.
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Affiliation(s)
- R Sasson
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
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Sasson R, Amsterdam A. Pleiotropic anti-apoptotic activity of glucocorticoids in ovarian follicular cells. Biochem Pharmacol 2003; 66:1393-401. [PMID: 14555213 DOI: 10.1016/s0006-2952(03)00489-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Glucocorticoids (GC) such as hydrocortisone and dexamethasone (DEX) protect steroidogenic granulosa cells against apoptosis induced by serum deprivation, cAMP, tumor necrosis factor alpha stimulation or p53 activation. The protective effects were evident both in primary rat and human granulosa cells, which comprise the main population of the ovarian follicular cells, as well as in steroidogenic granulosa cell lines established in our laboratory. A correlation between the expression of Bcl-2 protein and protection against apoptosis induced by DEX was found in granulosa cell lines expressing various levels of Bcl-2. Incubation with DEX leads to development of a rigid network of actin cytoskeleton and increased incidence of adherence and gap junctions. Higher content of connexin 43 and total cadherins were found in GC stimulated cells compared to non-stimulated, suggesting that cell contact and intracellular communication contribute to the DEX induced resistance to apoptotic signals. Activation by DEX of MAPK and Akt/PKB but not p38 supported the view of a pleiotropic action of GC against apoptotic signals. Granzyme B, a protease characteristic for induction of apoptosis by T-cytotoxic lymphocytes and natural killer cells, was expressed and augmented during stimulation of apoptosis in the granulosa cells, and its synthesis and activation was blocked by DEX. It is concluded that GC exerted their anti-apoptotic effects in granulosa cells by multiple characteristic pathways. Moreover, the presence of endogenous granzyme B in granulosa cells suggest a novel intrinsic alternative apoptotic pathway that was earlier reported to be mediated uniquely by T-cytotoxic lymphocytes and natural killer cells. The anti-apoptotic effect of GC may play an important role in the healing process of the ovulatory follicle subsequent to follicular rupture and its rapid conversion to an active corpus luteum.
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Affiliation(s)
- R Sasson
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel
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40
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Amsterdam A, Sasson R, Keren-Tal I, Aharoni D, Dantes A, Rimon E, Land A, Cohen T, Dor Y, Hirsh L. Alternative pathways of ovarian apoptosis: death for life. Biochem Pharmacol 2003; 66:1355-62. [PMID: 14555209 DOI: 10.1016/s0006-2952(03)00485-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Ovarian cell death is an essential process for the homeostasis of ovarian function in human and other mammalian species. It ensures the selection of the dominant follicle and the demise of excess follicles. In turn, this process minimizes the possibility of multiple embryo development during pregnancy and assures the development of few, but healthy embryos. Degeneration of the old corpora lutea in each estrus/menstrual cycle by programmed cell death is essential for maintaining the normal cyclicity of ovarian steroidogenesis. Although there are multiple pathways that can determine cell death or survival, crosstalk among endocrine, paracrine and autocrine factors, as well as among protooncogenes, tumor suppressor genes, survival genes and death genes, play an important role in determining the fate of ovarian somatic and germ cells. The establishment of immortalized rat and human steroidogenic granulosa cell lines and the investigation of pure populations of primary granulosa cells allows for systematic studies of the mechanisms that control steroidogenesis and apoptosis of granulosa cells. We have discovered that during initial stages of granulosa cell apoptosis progesterone production does not decrease. In contrast, we found that it is elevated for up to 24hr following the onset of the apoptotic stimuli exerted by starvation, cAMP, p53 or tumor necrosis factor alpha stimulation, before total cell collapse. These observations raise the possibility for an alternative unique apoptotic pathway, one that does not involve mitochondrial cytochrome C release associated with the destruction of mitochondrial structure and steroidogenic function. Using mRNA from apoptotic cells and Affymetrix DNA microarray we discovered that Granzyme B, a protease that normally resides in T cytotoxic lymphocytes and natural killer cells of the immune system is expressed and activated in granulosa cells, thereby allowing the apoptotic signals to bypass mitochondrial signals for apoptosis, which can preserve their steroidogenic activity until complete cell destruction. This unique apoptotic pathway assures the cyclicity of estradiol and progesterone release in the estrus/menstrus cycle even during the initial stage of apoptosis.
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Affiliation(s)
- A Amsterdam
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel.
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41
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Sasson R, Dantes A, Tajima K, Amsterdam A. Novel genes modulated by FSH in normal and immortalized FSH-responsive cells: new insights into the mechanism of FSH action. FASEB J 2003; 17:1256-66. [PMID: 12832290 DOI: 10.1096/fj.02-0740com] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Follicle-stimulating hormone (FSH) controls the development of follicle-enclosed oocytes in the mammalian ovary by interacting with specific receptors located exclusively on granulosa cells. Its biological activity involves stimulation of intercellular communication, intracellular signaling, and up-regulation of steroidogenesis; the entire spectrum of genes regulated by FSH is not yet fully characterized. We have established monoclonal rat FSH-responsive granulosa cell lines that express FSH receptors at 20-fold higher rates than with primary cells, and thus increased the probability of yielding a distinct spectrum of genes modulated by FSH. Using Affymetrix DNA microarrays, we discovered 11 genes not reported earlier to be up-regulated by FSH and 9 genes not reported earlier to be down-regulated by FSH. Modulation of signal transduction associated with G-protein signaling, phosphorylation of proteins, and intracellular-extracellular ion balance was suggested by up-regulation of decay accelerating factor GPI-form precursor (DAF), membrane interacting protein RGS16, protein tyrosine phosphatase (PTPase), oxidative stress-inducible protein tyrosine phosphatase (OSIPTPase), and down-regulation of rat prostatic acid phosphatase (rPAP), Na+, K+-ATPase, and protein phosphatase 1beta. Elevation in granzyme-like proteins 1 and 3, and natural killer (NK) cell protease 1 (NKP-1) along with reduction in carboxypeptidase E indicates possible FSH-mediated preparation of the cells for apoptosis. Up-regulation of vascular endothelial growth factors indicates the ability of FSH to produce angiogenic factors upon their maturation; whereas, reduction in insulin-like growth factor binding protein (IGFBP3) indicates its increased potential to promote p53-induced apoptosis. Striking similarities in FSH modulation of gene expression were found in primary cultures of human granulosa cells obtained from IVF patients although these cells expressed only 1% of FSH receptor compared with immortalized rat cells, as indicated by microarray technique, which probably is in the normal range of expression of this receptor in nontransformed cells. These findings should increase our understanding of the mechanism of FSH action in stimulating development of the ovarian follicular cells, of intracellular and intercellular communication, and of increasing the potential of ovarian follicular cells to undergo apoptosis during the process of selection of the dominant follicle.
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Affiliation(s)
- Ravid Sasson
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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Amsterdam A, Tajima K, Sasson R. Cell-specific regulation of apoptosis by glucocorticoids: implication to their anti-inflammatory action. Biochem Pharmacol 2002; 64:843-50. [PMID: 12213578 DOI: 10.1016/s0006-2952(02)01147-4] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Glucocorticoids play a major role in attenuation of the inflammatory response. These steroid hormones are able to induce apoptosis in cells of the hematopoietic system such as monocytes, macrophages, and T lymphocytes that are involved in the inflammation reaction. In contrast, it was discovered recently that in glandular cells such as the mammary gland epithelia, hepatocytes, ovarian follicular cells, and in fibroblasts glucocorticoids protect against apoptotic signals evoked by cytokines, cAMP, tumor suppressors, and death genes. The anti-apoptotic effect of glucocorticoids is exerted by modulation of several survival genes such as Bcl-2, Bcl-x(L), and NFkB, in a cell-specific manner. Moreover, upregulation or downregulation of the same gene product can occur in a cell-dependent manner following stimulation by glucocorticoids. This phenomenon is probably due to composite regulatory cross-talk among multiple nuclear coactivators or corepressors, which mediate the transcription regulation of the genes, by their interaction with the glucocorticoid receptor. These observations suggest that the anti-inflammatory action of glucocorticoids is exerted by two complementary mechanisms: on one hand, they induce death of the cells that provoke the inflammation, and on the other hand they protect the resident cells of the inflamed tissue by arresting apoptotic signals. Moreover, the complementary action of glucocorticoids provides a new insight to the therapeutic potential of these hormones.
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Affiliation(s)
- Abraham Amsterdam
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.
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43
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Sasson R, Amsterdam A. Stimulation of apoptosis in human granulosa cells from in vitro fertilization patients and its prevention by dexamethasone: involvement of cell contact and bcl-2 expression. J Clin Endocrinol Metab 2002; 87:3441-51. [PMID: 12107264 DOI: 10.1210/jcem.87.7.8676] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Human granulosa cells obtained from in vitro fertilization patients are highly luteinized, but can still be stimulated by LH/cAMP for production of progesterone. This stimulation involved enhancement of apoptosis. Incubation of the cells with dexamethasone (Dex) reduced the apoptotic incidence compared with nontreated cells and completely abolished the increase in apoptosis stimulated by LH or forskolin, concomitantly with a pronounced increase in progesterone production. Organization of the actin cytoskeleton was dramatically reduced after LH/forskolin stimulation. In contrast, Dex prevented disorganization of the actin filament networks. LH and forskolin also decreased the organization of gap junctions, which could be prevented by Dex. However, the intracellular level of connexin 43 was elevated in the presence of LH, forskolin, and Dex. Endogenous levels of the survival gene protein Bcl-2 were significantly elevated in all cultures treated with Dex compared with either nonstimulated cultures or cultures stimulated with LH and forskolin. Our data suggest that LH/cAMP can stimulate steroidogenesis even during the initial stage of apoptosis of human granulosa cells, whereas Dex, which blocks apoptosis, could further elevate progesterone production. Moreover, the integrity of gap junctions and the actin cytoskeleton as well as elevated levels of Bcl-2 may play an important role in the suppression of apoptosis of human granulosa cells.
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Affiliation(s)
- Ravid Sasson
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel
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Sasson R, Winder N, Kees S, Amsterdam A. Induction of apoptosis in granulosa cells by TNF alpha and its attenuation by glucocorticoids involve modulation of Bcl-2. Biochem Biophys Res Commun 2002; 294:51-9. [PMID: 12054739 DOI: 10.1016/s0006-291x(02)00431-x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Tumor necrosis factor alpha (TNF alpha) plays a role in mammalian ovarian follicular development, steroidogenesis, ovulation, luteolysis, and atresia, but the exact mechanism of TNF alpha action is not completely understood. Induction of apoptosis and suppression of steroidogenesis by TNF alpha in primary preovulatory rat and human granulosa cells, as well as, in human granulosa cells immortalized by mutated p53, were characterized in the present work. Dexamethasone (Dex) and hydrocortisone efficiently suppressed TNF alpha-induced apoptosis in granulosa cells. TNF alpha dramatically reduced intracellular levels of Bcl-2, while Dex abrogated this reduction. TNF alpha reduced considerably intracellular levels of StAR protein, a key regulating factor in steroidogenesis. This reduction can be explained only in part by elimination of cells through apoptosis, since loss of steroidogenic capacity was much higher and faster than the rate and extent of loss of cell viability induced by TNF alpha, suggesting independent mechanisms for TNF alpha-induction of apoptosis and TNF alpha-suppression of steroidogenesis.
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Affiliation(s)
- Ravid Sasson
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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Abstract
The development and function of cells in the immune system are regulated by many intrinsic and extrinsic factors. One class of molecule that affects immune cells belongs to the neuroendocrine system and the best-studied mediators in this category are glucocorticoids. These are small lypophilic molecules that participate in a wide number of normal and pathologic processes. This paper concentrates on their physiologic and pharmacologic effects on the immune response.
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Affiliation(s)
- Carlo Riccardi
- Department of Clinical and Experimental Medicine, Section of Pharmacology, Toxicology and Chemotherapy, University of Perugia, via del Giochetto, 06100 Perugia, Italy.
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Sengupta S, Wasylyk B. Ligand-dependent interaction of the glucocorticoid receptor with p53 enhances their degradation by Hdm2. Genes Dev 2001; 15:2367-80. [PMID: 11562347 PMCID: PMC312780 DOI: 10.1101/gad.202201] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The glucocorticoid receptor (GR) and the tumor suppressor p53 mediate different stress responses. We have studied the mechanism of their mutual inhibition in normal endothelial cells (HUVEC) in response to hypoxia, a physiological stress, and mitomycin C, which damages DNA. Dexamethasone (Dex) stimulates the degradation of endogenous GR and p53 by the proteasome pathway in HUVEC under hypoxia and mitomycin C treatments, and also in hepatoma cells (HepG2) under normoxia. Dex inhibits the functions of p53 (apoptosis, Bax, and p21(WAF1/CIP1) expression) and GR (PEPCK and G-6-Pase expression). Endogenous p53 and GR form a ligand-dependent trimeric complex with Hdm2 in the cytoplasm. Disruption of the p53-HDM2 interaction prevents Dex-induced ubiquitylation of GR and p53. The ubiquitylation of GR requires p53, the interaction of p53 with Hdm2, and E3 ligase activity of Hdm2. These results provide a mechanistic basis for GR and p53 acting as opposing forces in the decision between cell death and survival.
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Affiliation(s)
- S Sengupta
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, BP 163, 67404 Illkirch cedex, France
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