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Deng MY, Cheng J, Gao N, Li XY, Liu H, Wang YX. Dexamethasone attenuates neuropathic pain through spinal microglial expression of dynorphin A via the cAMP/PKA/p38 MAPK/CREB signaling pathway. Brain Behav Immun 2024; 119:36-50. [PMID: 38555991 DOI: 10.1016/j.bbi.2024.03.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 03/17/2024] [Accepted: 03/28/2024] [Indexed: 04/02/2024] Open
Abstract
This study aimed to elucidate the opioid mechanisms underlying dexamethasone-induced pain antihypersensitive effects in neuropathic rats. Dexamethasone (subcutaneous and intrathecal) and membrane-impermeable Dex-BSA (intrathecal) administration dose-dependently inhibited mechanical allodynia and thermal hyperalgesia in neuropathic rats. Dexamethasone and Dex-BSA treatments increased expression of dynorphin A in the spinal cords and primary cultured microglia. Dexamethasone specifically enhanced dynorphin A expression in microglia but not astrocytes or neurons. Intrathecal injection of the microglial metabolic inhibitor minocycline blocked dexamethasone-stimulated spinal dynorphin A expression; intrathecal minocycline, the glucocorticoid receptor antagonist Dex-21-mesylate, dynorphin A antiserum, and κ-opioid receptor antagonist GNTI completely blocked dexamethasone-induced mechanical antiallodynia and thermal antihyperalgesia. Additionally, dexamethasone elevated spinal intracellular cAMP levels, leading to enhanced phosphorylation of PKA, p38 MAPK and CREB. The specific adenylate cyclase inhibitor DDA, PKA inhibitor H89, p38 MAPK inhibitor SB203580 and CREB inhibitor KG-501 completely blocked dexamethasone-induced anti-neuropathic pain and increased microglial dynorphin A exprression. In conclusion, this study reveal that dexamethasone mitigateds neuropathic pain through upregulation of dynorphin A in spinal microglia, likely involving the membrane glucocorticoid receptor/cAMP/PKA/p38 MAPK/CREB signaling pathway.
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Affiliation(s)
- Meng-Yan Deng
- Institute of Clinical Pharmacology, Zhengzhou University, Zhengzhou 450001, China; King's Lab, Shanghai Jiao Tong University School of Pharmacy, Shanghai 200240, China
| | - Jing Cheng
- Institute of Clinical Pharmacology, Zhengzhou University, Zhengzhou 450001, China
| | - Na Gao
- Institute of Clinical Pharmacology, Zhengzhou University, Zhengzhou 450001, China
| | - Xin-Yan Li
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, Shanghai 200240, China
| | - Hao Liu
- School of Basic Medical Science, School of Medicine, Ningbo University, Zhejiang 315211, China
| | - Yong-Xiang Wang
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, Shanghai 200240, China.
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2
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Agbana S, McIlroy M. Extra-nuclear and cytoplasmic steroid receptor signalling in hormone dependent cancers. J Steroid Biochem Mol Biol 2024; 243:106559. [PMID: 38823459 DOI: 10.1016/j.jsbmb.2024.106559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 05/28/2024] [Accepted: 05/30/2024] [Indexed: 06/03/2024]
Abstract
Steroid hormone receptors are key mediators in the execution of hormone action through a combination of genomic and non-genomic action. Since their isolation and characterisation in the early 20th Century much of our understanding of the biological actions of steroid hormones are underpinned by their activated receptor activity. Over the past two decades there has been an acceleration of more omics-based research which has resulted in a major uptick in our comprehension of genomic steroid action. However, it is well understood that steroid hormones can induce very rapid signalling events in tandem with their genomic actions wherein they exert their influence through alterations in gene expression. Thus the totality of genomic and non-genomic steroid action occurs in a simultaneous and reciprocal manner and a greater appreciation of whole cell action is required to fully evaluate steroid hormone activity in vivo. In this mini-review we outline the most recent developments in non-genomic steroid action and cytoplasmic steroid hormone receptor biology in endocrine-related cancers with a focus on the 3-keto steroid receptors, in particular the androgen receptor.
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Affiliation(s)
- Stephanie Agbana
- Androgens in Health and Disease research group, RCSI University of Medicine and Health Sciences, Dublin, Ireland; Department of Surgery, RCSI University of Medicine and Health Sciences, Ireland
| | - Marie McIlroy
- Androgens in Health and Disease research group, RCSI University of Medicine and Health Sciences, Dublin, Ireland; Department of Surgery, RCSI University of Medicine and Health Sciences, Ireland.
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3
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Jiang L, Qiu W, Wang X, Duan X, Han X, Yu T, Wen S, Luo Z, Feng R, Teng Y, Yin H, Hedrich CM, Deng GM. Immunoglobulin G inhibits glucocorticoid-induced osteoporosis through occupation of FcγRI. iScience 2023; 26:107749. [PMID: 37701568 PMCID: PMC10493602 DOI: 10.1016/j.isci.2023.107749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 08/03/2023] [Accepted: 08/24/2023] [Indexed: 09/14/2023] Open
Abstract
Glucocorticoid-induced osteoporosis (GIOP) is a severe and common complication of long-term usage of glucocorticoids (GCs) and lacks of efficient therapy. Here, we investigated the mechanism of anti-inflammation effect and osteoclastogenesis side effect of GCs and immunoglobulin G (IgG) treatment against GIOP. GCs inhibited SLE IgG-induced inflammation, while IgG inhibited GCs-induced osteoclastogenesis. FcγRI and glucocorticoid receptor (GR) were found directly interacted with each other. GCs and IgG could reduce the expression of FcγRI on macrophages. The deficiency of FcγRI affected osteoclastogenesis by GCs and systemic lupus erythematosus (SLE) IgG-induced inflammation. Also, IgG efficiently reduced GIOP in mice. These data showed that GCs could induce osteoporosis and inhibit IgG-induced inflammation through FcγRI while IgG efficiently suppressed osteoporosis induced by GCs through FcγRI. Hence, our findings may help in developing a feasible therapeutic strategy against osteoporosis, such as GIOP.
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Affiliation(s)
- Lijuan Jiang
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Wenlin Qiu
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Xuefei Wang
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Xiaoru Duan
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Xiaoxiao Han
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Tong Yu
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Shenghui Wen
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Zhijun Luo
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Ruizhi Feng
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yao Teng
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Haifeng Yin
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Christian M. Hedrich
- Department of Pediatric Rheumatology, Alder Hey Children’s NHS Foundation Trust Hospital, Liverpool, UK
| | - Guo-Min Deng
- Department of Rheumatology and Immunology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
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4
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Aedo JE, Aravena-Canales D, Zuloaga R, Alegría D, Valdés JA, Molina A. Early regulation of corticosteroid receptor expression in rainbow trout (Oncorhynchus mykiss) gills is mediated by membrane-initiated cortisol signaling. Comp Biochem Physiol A Mol Integr Physiol 2023; 281:111423. [PMID: 37044370 DOI: 10.1016/j.cbpa.2023.111423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 04/06/2023] [Accepted: 04/06/2023] [Indexed: 04/14/2023]
Abstract
Cortisol is a key stress-related hormone involved in the physiological adjustments of fish. In gills, cortisol contributes to acclimatization to changes in environmental salinity, promoting both ion uptake or salt excretion. Cortisol exerts its biological effects through its interaction with specific intracellular glucocorticoid (GR) and mineralocorticoid (MR) receptors. Additionally, the further identification of GR and MR on the surface of different tissues, together with the existence of cortisol-mediated effects observed using membrane-impermeable analogs (e.g., cortisol-BSA), supports the existence of membrane-initiated cortisol actions in fish. Nevertheless, the impact of this alternative cortisol mechanism in relevant tissues for fish salinity acclimation, such as gill, is unknown. In this work, we sought to explore the contribution of rapid membrane-initiated cortisol on GR and MR regulation in rainbow trout (Oncorhynchus mykiss) gills using in vivo and in vitro approaches. Juvenile rainbow trout intraperitoneally injected with cortisol or cortisol-BSA showed increased gr2 but no gr1 or mr mRNA levels in gills after one hour of treatment. This result was further confirmed using RT-gills-W1 cell lines stimulated with both versions of cortisol. Interestingly, after three and six hours of cortisol or cortisol-BSA treatment, there were no changes in the mRNA levels of any corticosteroid receptor in RT-gills-W1 cells. Finally, using immunofluorescence analysis, we identified GR and MR in rainbow trout gill cells localized on the cell surface. Considering the in vivo and in vitro results of this work, we suggest that membrane-initiated cortisol action contributes to the early expression of gr2 in rainbow trout gills during salinity acclimation.
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Affiliation(s)
- Jorge E Aedo
- Universidad Andres Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago 8370146, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile; Departamento de Biología y Química, Facultad de Ciencias Básicas, Universidad Católica del Maule, Talca 3466706, Chile
| | - Daniela Aravena-Canales
- Universidad Andres Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago 8370146, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Rodrigo Zuloaga
- Universidad Andres Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago 8370146, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Denisse Alegría
- Universidad Andres Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago 8370146, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Juan A Valdés
- Universidad Andres Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago 8370146, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Alfredo Molina
- Universidad Andres Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago 8370146, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile.
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5
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Jiang Z, Chen C, Weiss GL, Fu X, Stelly CE, Sweeten BLW, Tirrell PS, Pursell I, Stevens CR, Fisher MO, Begley JC, Harrison LM, Tasker JG. Stress-induced glucocorticoid desensitizes adrenoreceptors to gate the neuroendocrine response to somatic stress in male mice. Cell Rep 2022; 41:111509. [PMID: 36261014 PMCID: PMC9635929 DOI: 10.1016/j.celrep.2022.111509] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 08/05/2022] [Accepted: 09/23/2022] [Indexed: 11/29/2022] Open
Abstract
Noradrenergic afferents to hypothalamic corticotropin releasing hormone (CRH) neurons provide a major excitatory drive to the hypothalamic-pituitary-adrenal (HPA) axis via α1 adrenoreceptor activation. Noradrenergic afferents are recruited preferentially by somatic, rather than psychological, stress stimuli. Stress-induced glucocorticoids feed back onto the hypothalamus to negatively regulate the HPA axis, providing a critical autoregulatory constraint that prevents glucocorticoid overexposure and neuropathology. Whether negative feedback mechanisms target stress modality-specific HPA activation is not known. Here, we describe a desensitization of the α1 adrenoreceptor activation of the HPA axis following acute stress in male mice that is mediated by rapid glucocorticoid regulation of adrenoreceptor trafficking in CRH neurons. Glucocorticoid-induced α1 receptor trafficking desensitizes the HPA axis to a somatic but not a psychological stressor. Our findings demonstrate a rapid glucocorticoid suppression of adrenergic signaling in CRH neurons that is specific to somatic stress activation, and they reveal a rapid, stress modality-selective glucocorticoid negative feedback mechanism. Physical and psychological stressors activate neuroendocrine secretion of corticosteroid. Noradrenaline circuits are critical to the neuroendocrine response to physical but not psychological stress. Jiang et al. show that stress-induced corticosteroids decrease noradrenaline sensitivity in the brain, which suppresses the response to subsequent physical stressors but leaves the psychological stress response intact.
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Affiliation(s)
- Zhiying Jiang
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA
| | - Chun Chen
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA
| | - Grant L Weiss
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA
| | - Xin Fu
- Neuroscience Program, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - Claire E Stelly
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - Brook L W Sweeten
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - Parker S Tirrell
- Neuroscience Program, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - India Pursell
- Neuroscience Program, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - Carly R Stevens
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA
| | - Marc O Fisher
- Neuroscience Program, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - John C Begley
- Neuroscience Program, Tulane University, New Orleans, LA 70118, USA
| | - Laura M Harrison
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - Jeffrey G Tasker
- Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118, USA; Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA.
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6
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Harrison LM, Tasker JG. Multiplexed Membrane Signaling by Glucocorticoids. CURRENT OPINION IN ENDOCRINE AND METABOLIC RESEARCH 2022; 26:100390. [PMID: 38075196 PMCID: PMC10703063 DOI: 10.1016/j.coemr.2022.100390] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
Glucocorticoids exert pleiotropic effects either by a relatively slow mechanism involving binding to cytosolic/nuclear receptors and regulation of gene expression or by rapid activation of a putative membrane receptor and membrane signal transduction. Rapid glucocorticoid actions are initiated at the membrane and recruit intracellular signaling pathways that engage multiple downstream cellular targets, including lipid and gas intercellular messengers, membrane neurotransmitter receptor trafficking, nuclear glucocorticoid receptor activation and trafficking, and more. Thus, membrane glucocorticoid signaling diverges into a multiplexed array of signaling pathways to simultaneously regulate highly diverse cellular functions, giving these steroid hormones a broad range of rapid regulatory capabilities. In this review, we provide a brief overview of the growing body of knowledge of the cell signaling mechanisms of rapid glucocorticoid actions in the brain.
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Affiliation(s)
- Laura M Harrison
- Department of Cell and Molecular Biology, Tulane Brain Institute, Tulane University, New Orleans, LA 70118
| | - Jeffrey G Tasker
- Department of Cell and Molecular Biology, Tulane Brain Institute, Tulane University, New Orleans, LA 70118
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7
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Karst H, den Boon FS, Vervoort N, Adrian M, Kapitein LC, Joëls M. Non-genomic steroid signaling through the mineralocorticoid receptor: Involvement of a membrane-associated receptor? Mol Cell Endocrinol 2022; 541:111501. [PMID: 34740745 DOI: 10.1016/j.mce.2021.111501] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 10/05/2021] [Accepted: 10/27/2021] [Indexed: 12/25/2022]
Abstract
Corticosteroid receptors in the mammalian brain mediate genomic as well as non-genomic actions. Although receptors mediating genomic actions were already cloned 35 years ago, it remains unclear whether the same molecules are responsible for the non-genomic actions or that the latter involve a separate class of receptors. Here we focus on one type of corticosteroid receptors, i.e. the mineralocorticoid receptor (MR). We summarize some of the known properties and the current insight in the localization of the MR in peripheral cells and neurons, especially in relation to non-genomic signaling. Previous studies from our own and other labs provided evidence that MRs mediating non-genomic actions are identical to the ones involved in genomic signaling, but may be translocated to the plasma cell membrane instead of the nucleus. With fixed cell imaging and live cell imaging techniques we tried to visualize these presumed membrane-associated MRs, using antibodies or overexpression of MR-GFP in COS7 and hippocampal cultured neurons. Despite the physiological evidence for MR location in or close to the cell membrane, we could not convincingly visualize membrane localization of endogenous MRs or GFP-MR molecules. However, we did find punctae of labeled antibodies intracellularly, which might indicate transactivating spots of MR near the membrane. We also found some evidence for trafficking of MR via beta-arrestins. In beta-arrestin knockout mice, we didn't observe metaplasticity in the basolateral amygdala anymore, indicating that internalization of MRs could play a role during corticosterone activation. Furthermore, we speculate that membrane-associated MRs could act indirectly via activating other membrane located structures like e.g. GPER and/or receptor tyrosine kinases.
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Affiliation(s)
- Henk Karst
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands.
| | - Femke S den Boon
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Niek Vervoort
- University Utrecht, Faculty of Science, Division of Cell Biology, Utrecht, the Netherlands
| | - Max Adrian
- University Utrecht, Faculty of Science, Division of Cell Biology, Utrecht, the Netherlands
| | - Lukas C Kapitein
- University Utrecht, Faculty of Science, Division of Cell Biology, Utrecht, the Netherlands
| | - Marian Joëls
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands; University Medical Center Groningen, University of Groningen, the Netherlands
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8
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Aedo J, Aravena-Canales D, Ruiz-Jarabo I, Oyarzún R, Molina A, Martínez-Rodríguez G, Valdés JA, Mancera JM. Differential Metabolic and Transcriptional Responses of Gilthead Seabream ( Sparus aurata) Administered with Cortisol or Cortisol-BSA. Animals (Basel) 2021; 11:ani11113310. [PMID: 34828041 PMCID: PMC8614361 DOI: 10.3390/ani11113310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/10/2021] [Accepted: 11/18/2021] [Indexed: 12/20/2022] Open
Abstract
Simple Summary Cortisol is a key stress hormone in teleosts. Cortisol exerts its effects through genomic—and membrane-initiated mechanisms, however, the role of the latter in long-term stress responses is unknown. Here, we treated Sparus aurata with cortisol or cortisol-BSA (exclusive inductor to membrane-initiated effects) to emulate a long-term stress situation. We found that cortisol, but not cortisol-BSA, promotes energy substrate mobilization in the liver, together with the regulation of metabolism-related genes. We suggest that genomic cortisol actions exclusively participate in metabolic responses during prolonged treatment using cortisol in S. aurata. This study contributes to the current knowledge on cortisol’s involvement in stress responses in fish. Abstract Cortisol is the main glucocorticoid hormone promoting compensatory metabolic responses of stress in teleosts. This hormone acts through genomic and membrane-initiated actions to exert its functions inside the cell. Experimental approaches, using exogenous cortisol administration, confirm the role of this hormone during short (minutes to hours)- and long-term (days to weeks) responses to stress. The role of membrane-initiated cortisol signaling during long-term responses has been recently explored. In this study, Sparus aurata were intraperitoneally injected with coconut oil alone or coconut oil containing cortisol, cortisol-BSA, or BSA. After 3 days of treatment, plasma, liver, and skeletal muscle were extracted. Plasma cortisol, as well as metabolic indicators in the plasma and tissues collected, and metabolism-related gene expression, were measured. Our results showed that artificially increased plasma cortisol levels in S. aurata enhanced plasma glucose and triacylglycerols values as well as hepatic substrate energy mobilization. Additionally, cortisol stimulated hepatic carbohydrates metabolism, as seen by the increased expression of metabolism-related genes. All of these responses, observed in cortisol-administered fish, were not detected by replicating the same protocol and instead using cortisol-BSA, which exclusively induces membrane-initiated effects. Therefore, we suggest that after three days of cortisol administration, only genomic actions are involved in the metabolic responses in S. aurata.
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Affiliation(s)
- Jorge Aedo
- Department of Biological Sciences, Faculty of Life Sciences, Andres Bello University, Santiago 8320000, Chile; (J.A.); (D.A.-C.); (A.M.)
- Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Daniela Aravena-Canales
- Department of Biological Sciences, Faculty of Life Sciences, Andres Bello University, Santiago 8320000, Chile; (J.A.); (D.A.-C.); (A.M.)
- Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Ignacio Ruiz-Jarabo
- Department of Biology, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cádiz, 11519 Puerto Real, Spain; (I.R.-J.); (J.M.M.)
- Department of Animal Physiology, Faculty of Biology, University Complutense of Madrid, 28040 Madrid, Spain
| | - Ricardo Oyarzún
- Institute of Marine and Limnological Sciences, Faculty of Sciences, University Austral of Chile, Valdivia 5110652, Chile;
| | - Alfredo Molina
- Department of Biological Sciences, Faculty of Life Sciences, Andres Bello University, Santiago 8320000, Chile; (J.A.); (D.A.-C.); (A.M.)
- Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
| | - Gonzalo Martínez-Rodríguez
- Department of Marine Biology and Aquaculture, Instituto de Ciencias Marinas de Andalucía (ICMAN-CSIC), 11519 Puerto Real, Spain;
| | - Juan Antonio Valdés
- Department of Biological Sciences, Faculty of Life Sciences, Andres Bello University, Santiago 8320000, Chile; (J.A.); (D.A.-C.); (A.M.)
- Interdisciplinary Center for Aquaculture Research (INCAR), Concepción 4030000, Chile
- Correspondence: ; Tel.: +56-2661-8363; Fax: +56-2661-8415
| | - Juan Miguel Mancera
- Department of Biology, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cádiz, 11519 Puerto Real, Spain; (I.R.-J.); (J.M.M.)
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9
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Oseid DE, Song L, Lear S, Robinson AS. Nuclear translocation of the unliganded glucocorticoid receptor is influenced by membrane fluidity, but not A 2AR agonism. Steroids 2020; 160:108641. [PMID: 32289327 DOI: 10.1016/j.steroids.2020.108641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 03/25/2020] [Accepted: 04/03/2020] [Indexed: 01/22/2023]
Abstract
Epidemiological evidence suggests that chronic consumption of caffeine, a non-selective antagonist of adenosine A2AR receptors (A2AR), can be neuroprotective in a number of age-related neurodegenerative disorders including Alzheimer's disease. A growing body of work shows that this neuroprotection may act via a synergistic interaction with the glucocorticoid receptor (GR) and its associated genetic response elements. Therefore, we hypothesized that A2AR signaling may directly stimulate glucocorticoid receptor translocation via downstream signaling elements within the cell. Surprisingly, we found no effect of A2AR agonism on GR translocation in the absence of steroid. As expected, membrane-bound dexamethasone was capable of stimulating full GR translocation, albeit at a slower rate. This non-liganded translocation was unaffected by A2AR ligands, providing strong evidence that GR translocation occurs independently of activation of A2ARs. To identify other potential mechanisms of translocation, membrane fluidity was increased significantly by benzyl alcohol, which also induced full nuclear translocation of the GR, but unlike the membrane-bound dexamethasone, benzyl alcohol did result in transcriptional upregulation of GR-dependent genes. Taken together, our data shows that the unliganded GR is sensitive to changes in membrane state and can be transcriptionally active.
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Affiliation(s)
- Daniel E Oseid
- Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA
| | - Liqing Song
- Department of Chemical Engineering, Carnegie Mellon, Pittsburgh, PA, 15213, USA
| | - Sierra Lear
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA
| | - Anne S Robinson
- Tulane Brain Institute, Tulane University, New Orleans, LA 70118, USA; Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA; Department of Chemical Engineering, Carnegie Mellon, Pittsburgh, PA, 15213, USA.
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10
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Rainville JR, Weiss GL, Evanson N, Herman JP, Vasudevan N, Tasker JG. Membrane-initiated nuclear trafficking of the glucocorticoid receptor in hypothalamic neurons. Steroids 2019; 142:55-64. [PMID: 29242167 PMCID: PMC5997511 DOI: 10.1016/j.steroids.2017.12.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 10/10/2017] [Accepted: 12/07/2017] [Indexed: 11/15/2022]
Abstract
Glucocorticoid binding to the intracellular glucocorticoid receptor (GR) stimulates the translocation of the GR from the cytosol to the nucleus, which leads to the transactivation or transrepression of gene transcription. However, multiple lines of evidence suggest that glucocorticoid signaling can also be initiated from the plasma membrane. Here, we provide evidence for membrane-initiated glucocorticoid signaling by a membrane-impermeant dexamethasone-bovine serum albumin (Dex-BSA) conjugate, which induced GR nuclear trafficking in hypothalamic neurons in vitro and in vivo. The GR nuclear translocation induced by a membrane-impermeant glucocorticoid suggests trafficking of an unliganded GR. The membrane-initiated GR trafficking was not blocked by inhibiting ERK MAPK, p38 MAPK, PKA, Akt, Src kinase, or calcium signaling, but was inhibited by Akt activation. Short-term exposure of hypothalamic neurons to dexamethasone (Dex) activated the glucocorticoid response element (GRE), suggesting transcriptional transactivation, whereas exposure to the Dex-BSA conjugate failed to activate the GRE, suggesting differential transcriptional activity of the liganded compared to the unliganded GR. Microarray analysis revealed divergent transcriptional regulation by Dex-BSA compared to Dex. Together, our data suggest that signaling from a putative membrane glucocorticoid receptor induces the trafficking of unliganded GR to the nucleus, which elicits a pattern of gene transcription that differs from that of the liganded receptor. The differential transcriptional signaling by liganded and unliganded receptors may contribute to the broad range of genetic regulation by glucocorticoids, and may help explain some of the different off-target actions of glucocorticoid drugs.
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Affiliation(s)
- Jennifer R Rainville
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, USA
| | - Grant L Weiss
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, USA
| | - Nathan Evanson
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH, USA; Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - James P Herman
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH, USA
| | | | - Jeffrey G Tasker
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, USA; Tulane Brain Institute, Tulane University, New Orleans, LA, USA.
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Nongenomic Glucocorticoid Suppression of a Postsynaptic Potassium Current via Emergent Autocrine Endocannabinoid Signaling in Hypothalamic Neuroendocrine Cells following Chronic Dehydration. eNeuro 2017; 4:eN-NWR-0216-17. [PMID: 28966975 PMCID: PMC5617081 DOI: 10.1523/eneuro.0216-17.2017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 08/19/2017] [Accepted: 08/22/2017] [Indexed: 11/21/2022] Open
Abstract
Glucocorticoids rapidly stimulate endocannabinoid synthesis and modulation of synaptic transmission in hypothalamic neuroendocrine cells via a nongenomic signaling mechanism. The endocannabinoid actions are synapse-constrained by astrocyte restriction of extracellular spatial domains. Exogenous cannabinoids have been shown to modulate postsynaptic potassium currents, including the A-type potassium current (IA), in different cell types. The activity of magnocellular neuroendocrine cells is shaped by a prominent IA. We tested for a rapid glucocorticoid modulation of the postsynaptic IK and IA in magnocellular neuroendocrine cells of the hypothalamic paraventricular nucleus (PVN) using whole-cell recordings in rat brain slices. Application of the synthetic glucocorticoid dexamethasone (Dex) had no rapid effect on the IK or IA amplitude, voltage dependence, or kinetics in magnocellular neurons in slices from untreated rats. In magnocellular neurons from salt-loaded rats, however, Dex application caused a rapid suppression of the IA and a depolarizing shift in IA voltage dependence. Exogenously applied endocannabinoids mimicked the rapid Dex modulation of the IA, and CB1 receptor antagonists and agonists blocked and occluded the Dex-induced changes in the IA, respectively, suggesting an endocannabinoid dependence of the rapid glucocorticoid effect. Preincubation of control slices in a gliotoxin resulted in the partial recapitulation of the glucocorticoid-induced rapid suppression of the IA. These findings demonstrate a glucocorticoid suppression of the postsynaptic IA in PVN magnocellular neurons via an autocrine endocannabinoid-dependent mechanism following chronic dehydration, and suggest a possible role for astrocytes in the control of the autocrine endocannabinoid actions.
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