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Abdelhamid M, Jung CG, Zhou C, Inoue R, Chen Y, Sento Y, Hida H, Michikawa M. Potential Therapeutic Effects of Bifidobacterium breve MCC1274 on Alzheimer's Disease Pathologies in AppNL-G-F Mice. Nutrients 2024; 16:538. [PMID: 38398861 PMCID: PMC10893354 DOI: 10.3390/nu16040538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 02/08/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024] Open
Abstract
We previously demonstrated that orally supplemented Bifidobacterium breve MCC1274 (B. breve MCC1274) mitigated Alzheimer's disease (AD) pathologies in both 7-month-old AppNL-G-F mice and wild-type mice; thus, B. breve MCC1274 supplementation might potentially prevent the progression of AD. However, the possibility of using this probiotic as a treatment for AD remains unclear. Thus, we investigated the potential therapeutic effects of this probiotic on AD using 17-month-old AppNL-G-F mice with memory deficits and amyloid beta saturation in the brain. B. breve MCC1274 supplementation ameliorated memory impairment via an amyloid-cascade-independent pathway. It reduced hippocampal and cortical levels of phosphorylated extracellular signal-regulated kinase and c-Jun N-terminal kinase as well as heat shock protein 90, which might have suppressed tau hyperphosphorylation and chronic stress. Moreover, B. breve MCC1274 supplementation increased hippocampal synaptic protein levels and upregulated neuronal activity. Thus, B. breve MCC1274 supplementation may alleviate cognitive dysfunction by reducing chronic stress and tau hyperphosphorylation, thereby enhancing both synaptic density and neuronal activity in 17-month-old AppNL-G-F mice. Overall, this study suggests that B. breve MCC1274 has anti-AD effects and can be used as a potential treatment for AD.
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Affiliation(s)
- Mona Abdelhamid
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan; (M.A.); (C.Z.); (R.I.); (Y.C.)
| | - Cha-Gyun Jung
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan; (M.A.); (C.Z.); (R.I.); (Y.C.)
- Department of Neurophysiology and Brain Science, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan;
| | - Chunyu Zhou
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan; (M.A.); (C.Z.); (R.I.); (Y.C.)
| | - Rieko Inoue
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan; (M.A.); (C.Z.); (R.I.); (Y.C.)
| | - Yuxin Chen
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan; (M.A.); (C.Z.); (R.I.); (Y.C.)
| | - Yoshiki Sento
- Department of Anesthesiology and Intensive Care Medicine, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan;
| | - Hideki Hida
- Department of Neurophysiology and Brain Science, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan;
| | - Makoto Michikawa
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan; (M.A.); (C.Z.); (R.I.); (Y.C.)
- Department of Geriatric Medicine School of Life, Dentistry at Niigata, Nippon Dental University, 1-8 Hamaura-cho, Chuo-ku, Niigata 951-8580, Japan
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Borin C, Pieters T, Serafin V, Ntziachristos P. Emerging Epigenetic and Posttranslational Mechanisms Controlling Resistance to Glucocorticoids in Acute Lymphoblastic Leukemia. Hemasphere 2023; 7:e916. [PMID: 37359189 PMCID: PMC10289758 DOI: 10.1097/hs9.0000000000000916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 05/16/2023] [Indexed: 06/28/2023] Open
Abstract
Glucocorticoids are extensively used for the treatment of acute lymphoblastic leukemia as they pressure cancer cells to undergo apoptosis. Nevertheless, glucocorticoid partners, modifications, and mechanisms of action are hitherto poorly characterized. This hampers our understanding of therapy resistance, frequently occurring in leukemia despite the current therapeutic combinations using glucocorticoids in acute lymphoblastic leukemia. In this review, we initially cover the traditional view of glucocorticoid resistance and ways of targeting this resistance. We discuss recent progress in our understanding of chromatin and posttranslational properties of the glucocorticoid receptor that might be proven beneficial in our efforts to understand and target therapy resistance. We discuss emerging roles of pathways and proteins such as the lymphocyte-specific kinase that antagonizes glucocorticoid receptor activation and nuclear translocation. In addition, we provide an overview of ongoing therapeutic approaches that sensitize cells to glucocorticoids including small molecule inhibitors and proteolysis-targeting chimeras.
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Affiliation(s)
- Cristina Borin
- Department of Biomolecular Medicine, Ghent University, Belgium
- Center for Medical Genetics, Ghent University and University Hospital, Belgium
- Cancer Research Institute Ghent (CRIG), Belgium
| | - Tim Pieters
- Department of Biomolecular Medicine, Ghent University, Belgium
- Center for Medical Genetics, Ghent University and University Hospital, Belgium
- Cancer Research Institute Ghent (CRIG), Belgium
| | - Valentina Serafin
- Department of Surgery Oncology and Gastroenterology, Oncology and Immunology Section, University of Padova, Italy
| | - Panagiotis Ntziachristos
- Department of Biomolecular Medicine, Ghent University, Belgium
- Center for Medical Genetics, Ghent University and University Hospital, Belgium
- Cancer Research Institute Ghent (CRIG), Belgium
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Deploey N, Van Moortel L, Rogatsky I, Peelman F, De Bosscher K. The Biologist's Guide to the Glucocorticoid Receptor's Structure. Cells 2023; 12:1636. [PMID: 37371105 PMCID: PMC10297449 DOI: 10.3390/cells12121636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/07/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
The glucocorticoid receptor α (GRα) is a member of the nuclear receptor superfamily and functions as a glucocorticoid (GC)-responsive transcription factor. GR can halt inflammation and kill off cancer cells, thus explaining the widespread use of glucocorticoids in the clinic. However, side effects and therapy resistance limit GR's therapeutic potential, emphasizing the importance of resolving all of GR's context-specific action mechanisms. Fortunately, the understanding of GR structure, conformation, and stoichiometry in the different GR-controlled biological pathways is now gradually increasing. This information will be crucial to close knowledge gaps on GR function. In this review, we focus on the various domains and mechanisms of action of GR, all from a structural perspective.
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Affiliation(s)
- Nick Deploey
- VIB Center for Medical Biotechnology, VIB, 9052 Ghent, Belgium; (N.D.); (L.V.M.); (F.P.)
- Department of Biomolecular Medicine, Ghent University, 9000 Ghent, Belgium
- Translational Nuclear Receptor Research (TNRR) Laboratory, VIB, 9052 Ghent, Belgium
| | - Laura Van Moortel
- VIB Center for Medical Biotechnology, VIB, 9052 Ghent, Belgium; (N.D.); (L.V.M.); (F.P.)
- Department of Biomolecular Medicine, Ghent University, 9000 Ghent, Belgium
- Translational Nuclear Receptor Research (TNRR) Laboratory, VIB, 9052 Ghent, Belgium
| | - Inez Rogatsky
- Hospital for Special Surgery Research Institute, The David Z. Rosensweig Genomics Center, New York, NY 10021, USA;
- Graduate Program in Immunology and Microbial Pathogenesis, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA
| | - Frank Peelman
- VIB Center for Medical Biotechnology, VIB, 9052 Ghent, Belgium; (N.D.); (L.V.M.); (F.P.)
- Department of Biomolecular Medicine, Ghent University, 9000 Ghent, Belgium
| | - Karolien De Bosscher
- VIB Center for Medical Biotechnology, VIB, 9052 Ghent, Belgium; (N.D.); (L.V.M.); (F.P.)
- Department of Biomolecular Medicine, Ghent University, 9000 Ghent, Belgium
- Translational Nuclear Receptor Research (TNRR) Laboratory, VIB, 9052 Ghent, Belgium
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Li S, Mu X, Ma S, Li X, Gao J, Liu X, Wang H, Wu J, Guo Y, Song C. Xiangshao Granules reduce the aggressive behavior and hippocampal injury of premenstrual irritability in rats by regulating JIK/JNK/p38 signal pathway. JOURNAL OF ETHNOPHARMACOLOGY 2023; 305:116061. [PMID: 36577489 DOI: 10.1016/j.jep.2022.116061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/17/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE As a typical prescription for soothing the liver, Xiangshao granule has a good effect on the symptoms of irritability and anxiety. Clinical evidence suggests that it has significant efficacy in the treatment of Premenstrual dysphoria disorder (PMDD). However, the underlying mechanism remains unclear. AIM OF THE STUDY PMDD is a common disease in women of childbearing age, seriously affecting their family, society, and daily work life. The registered herbal medicine, Xiangshao granules, is used for relieving PMDD dysphoria and irritability symptoms with excellent efficacy in China. This study was focused on the deep intervention mechanism of Xiangshao granules in treating PMDD. MATERIALS AND METHODS The vaginal smear and open field test were used to screen rats in nonreception phase of estrus cycle with similar macroscopic behaviors and regular estrus cycle. The rat model of PMDD irritability was established through social isolation and residential invasion, with which, the irritability symptoms of PMDD patients with menstrual cycle dependence was also well simulated. Elevated plus Maze Test and Social interaction activities were used to measure the anxiety-like behavior of rats. TUNEL Staining and Hematoxylin-Eosin staining were used to measure apoptosis of hippocampal neurons. RT-PCR, Western blot and immunofluorescence were used to measure the expression of GR, JIK, p-JIK, p38, P-P38, JNK, caspase 3, and caspase 12. RESULTS In this study, Xiangshao granules showed consistent therapeutic effects similar with those in clinic, significantly reducing aggressive and anxiety-like behaviors with improved social skills in PMDD rats. In mechanism, Xiangshao granules lowered the apoptosis of hippocampal neurons and weakened the morphological damage of the hippocampal brain evidenced by the decreased mRNA and protein expression of glucocorticoid receptor, caspase-3, and caspase-12. In addition, administration of Xiangshao granules led to the decreased expression of JIK in the PMDD irritability rat model which agreed well with the previous studies. The JNK/p38 mitogen-activated protein kinases (MAPKs) signaling pathway is abnormally activated in the hippocampal brain region of PMDD rats, while treated with Xiangshao granules could increase JIK expression and inhibit the abnormal activation of the JNK/p38 MAPK signaling pathway, effectively reducing the stress damage in the hippocampus. CONCLUSIONS Xiangshao Granules Reduce the Aggressive Behavior and Hippocampal Injury of Premenstrual Irritability in Rats by Regulating JIK/JNK/p38 Signal Pathway.
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Affiliation(s)
- Shujing Li
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Xiangyu Mu
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Sufen Ma
- Academic Administration, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Xin Li
- Department of Pharmacology & Chemical Biology, Baylor College of Medicine, Houston, TX, USA.
| | - Jie Gao
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Xiaoju Liu
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Haijuan Wang
- Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.
| | - Junling Wu
- Department of Science and Technology, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Yinghui Guo
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Chunhong Song
- Shandong Key Laboratory of Traditional Chinese Medicine and Stress Injury, Department of Laboratory Animal Center, Central Hospital Affiliated to Shandong First Medical University, Jinan, China.
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Crosstalk between p38 MAPK and GR Signaling. Int J Mol Sci 2022; 23:ijms23063322. [PMID: 35328742 PMCID: PMC8953609 DOI: 10.3390/ijms23063322] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/13/2022] [Accepted: 03/16/2022] [Indexed: 12/21/2022] Open
Abstract
The p38 MAPK is a signaling pathway important for cells to respond to environmental and intracellular stress. Upon activation, the p38 kinase phosphorylates downstream effectors, which control the inflammatory response and coordinate fundamental cellular processes such as proliferation, apoptosis, and differentiation. Dysregulation of this signaling pathway has been linked to inflammatory diseases and cancer. Secretion of glucocorticoids (GCs) is a classical endocrine response to stress. The glucocorticoid receptor (GR) is the primary effector of GCs and plays an important role in the regulation of cell metabolism and immune response by influencing gene expression in response to hormone-dependent activation. Its ligands, the GCs or steroids, in natural or synthetic variation, are used as standard therapy for anti-inflammatory treatment, severe asthma, autoimmune diseases, and several types of cancer. Several years ago, the GR was identified as one of the downstream targets of p38, and, at the same time, it was shown that glucocorticoids could influence p38 signaling. In this review, we discuss the role of the crosstalk between the p38 and GR in the regulation of gene expression in response to steroids and comprehend the importance and potential of this interplay in future clinical applications.
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Wang B, Yang X, Lu J, Ntim M, Xia M, Kundu S, Jiang R, Chen D, Wang Y, Yang JY, Li S. Two-hour acute restraint stress facilitates escape behavior and learning outcomes through the activation of the Cdk5/GR P S211 pathway in male mice. Exp Neurol 2022; 354:114023. [PMID: 35218707 DOI: 10.1016/j.expneurol.2022.114023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 01/03/2022] [Accepted: 02/20/2022] [Indexed: 11/18/2022]
Abstract
Acute stress exerts pleiotropic actions on learning behaviors. The induced negative effects are sometimes adopted to measure the efficacy of particular drugs. Until now, there are no detailed experimental data on the time-gradient effects of acute stress. Here, we developed the time gradient acute restraint stress (ARS) model to precisely assess the roles of different restrain times on inducing acute stress. Time gradient ARS facilitates escape behaviors and learning outcomes, peaking at 2 h-ARS and then declining to baseline at 3.5 h-ARS as confirmed by time gradient post-stress data. Furthermore, time gradient ARS activates glucocorticoid receptor (GR) phosphorylation site at Serine211 (P S221) as an inverted V-shaped pattern peaking at 2 h-ARS, whereas that of the GR phosphorylation site at Serine226 (P S226) from 2 h-ARS to 3.5 h-ARS. The 2 h-ARS but not 3.5 h-ARS enhances synaptic plasticity and genes transcription associated with learning and memory in the hippocampus of male mice. The Cdk5 inhibitor, roscovitine, blocks this facilitation effect by intervening in GR phosphorylation at Serine211 in the 2 h-ARS mice. Altogether, these findings show that the time gradient ARS selectively activates GR phospho-isoforms and differentially influences the behaviors along with maintaining a relationship between 2 h-ARS and Cdk5/GR P S211-mediated transcriptional activity.
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Affiliation(s)
- Bin Wang
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China
| | - Xuewei Yang
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China
| | - Jincheng Lu
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China
| | - Michael Ntim
- Department of Physiology, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Min Xia
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China
| | - Supratik Kundu
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China
| | - Rong Jiang
- Department of Physiology, Binzhou Medical University, Yantai Campus, 346 Guanhai Road, Laishan District, Yantai, Shandong, China
| | - Defang Chen
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China
| | - Ying Wang
- Department of Cardiology, Institute of Heart and Vessel Diseases of Dalian Medical University, the Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Jin-Yi Yang
- Department of Urology, Affiliated Dalian Friendship Hospital of Dalian Medical University, Dalian, China.
| | - Shao Li
- Department of Physiology, College of Basic Medical Sciences, Liaoning Provincial Key Laboratory of Cerebral Diseases, National-Local Joint Engineering Research Center for Drug-Research and Development (R&D) of Neurodegenerative Diseases, Dalian Medical University, Dalian, Liaoning, China.
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Butz H, Patócs A. Mechanisms behind context-dependent role of glucocorticoids in breast cancer progression. Cancer Metastasis Rev 2022; 41:803-832. [PMID: 35761157 PMCID: PMC9758252 DOI: 10.1007/s10555-022-10047-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 06/09/2022] [Indexed: 02/08/2023]
Abstract
Glucocorticoids (GCs), mostly dexamethasone (dex), are routinely administered as adjuvant therapy to manage side effects in breast cancer. However, recently, it has been revealed that dex triggers different effects and correlates with opposite outcomes depending on the breast cancer molecular subtype. This has raised new concerns regarding the generalized use of GC and suggested that the context-dependent effects of GCs can be taken into potential consideration during treatment design. Based on this, attention has recently been drawn to the role of the glucocorticoid receptor (GR) in development and progression of breast cancer. Therefore, in this comprehensive review, we aimed to summarize the different mechanisms behind different context-dependent GC actions in breast cancer by applying a multilevel examination, starting from the association of variants of the GR-encoding gene to expression at the mRNA and protein level of the receptor, and its interactions with other factors influencing GC action in breast cancer. The role of GCs in chemosensitivity and chemoresistance observed during breast cancer therapy is discussed. In addition, experiences using GC targeting therapeutic options (already used and investigated in preclinical and clinical trials), such as classic GC dexamethasone, selective glucocorticoid receptor agonists and modulators, the GC antagonist mifepristone, and GR coregulators, are also summarized. Evidence presented can aid a better understanding of the biology of context-dependent GC action that can lead to further advances in the personalized therapy of breast cancer by the evaluation of GR along with the conventional estrogen receptor (ER) and progesterone receptor (PR) in the routine diagnostic procedure.
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Affiliation(s)
- Henriett Butz
- Department of Molecular Genetics and the National Tumor Biology Laboratory, National Institute of Oncology, Budapest, Hungary.
- Hereditary Tumours Research Group, Hungarian Academy of Sciences-Semmelweis University, Budapest, Hungary.
- Department of Laboratory Medicine, Semmelweis University, Budapest, Hungary.
| | - Attila Patócs
- Department of Molecular Genetics and the National Tumor Biology Laboratory, National Institute of Oncology, Budapest, Hungary
- Hereditary Tumours Research Group, Hungarian Academy of Sciences-Semmelweis University, Budapest, Hungary
- Department of Laboratory Medicine, Semmelweis University, Budapest, Hungary
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Tesic V, Ciric J, Jovanovic Macura I, Zogovic N, Milanovic D, Kanazir S, Perovic M. Corticosterone and Glucocorticoid Receptor in the Cortex of Rats during Aging-The Effects of Long-Term Food Restriction. Nutrients 2021; 13:nu13124526. [PMID: 34960078 PMCID: PMC8703853 DOI: 10.3390/nu13124526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 11/16/2022] Open
Abstract
Numerous beneficial effects of food restriction on aging and age-related pathologies are well documented. It is also well-established that both short- and long-term food restriction regimens induce elevated circulating levels of glucocorticoids, stress-induced hormones produced by adrenal glands that can also exert deleterious effects on the brain. In the present study, we examined the effect of long-term food restriction on the glucocorticoid hormone/glucocorticoid receptor (GR) system in the cortex during aging, in 18- and 24-month-old rats. Corticosterone level was increased in the cortex of aged ad libitum-fed rats. Food restriction induced its further increase, accompanied with an increase in the level of 11β-hydroxysteroid dehydrogenase type 1. However, alterations in the level of GR phosphorylated at Ser232 were not detected in animals on food restriction, in line with unaltered CDK5 level, the decrease of Hsp90, and an increase in a negative regulator of GR function, FKBP51. Moreover, our data revealed that reduced food intake prevented age-related increase in the levels of NFκB, gfap, and bax, confirming its anti-inflammatory and anti-apoptotic effects. Along with an increase in the levels of c-fos, our study provides additional evidences that food restriction affects cortical responsiveness to glucocorticoids during aging.
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Affiliation(s)
- Vesna Tesic
- Department of Neurobiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia; (V.T.); (J.C.); (I.J.M.); (D.M.); (M.P.)
| | - Jelena Ciric
- Department of Neurobiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia; (V.T.); (J.C.); (I.J.M.); (D.M.); (M.P.)
| | - Irena Jovanovic Macura
- Department of Neurobiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia; (V.T.); (J.C.); (I.J.M.); (D.M.); (M.P.)
| | - Nevena Zogovic
- Department of Neurophysiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia;
| | - Desanka Milanovic
- Department of Neurobiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia; (V.T.); (J.C.); (I.J.M.); (D.M.); (M.P.)
| | - Selma Kanazir
- Department of Neurobiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia; (V.T.); (J.C.); (I.J.M.); (D.M.); (M.P.)
- Correspondence:
| | - Milka Perovic
- Department of Neurobiology, Institute for Biological Research “Sinisa Stankovic”—National Institute of Republic of Serbia, University of Belgrade, Bul. despota Stefana 142, 11060 Belgrade, Serbia; (V.T.); (J.C.); (I.J.M.); (D.M.); (M.P.)
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9
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Häusl AS, Brix LM, Hartmann J, Pöhlmann ML, Lopez JP, Menegaz D, Brivio E, Engelhardt C, Roeh S, Bajaj T, Rudolph L, Stoffel R, Hafner K, Goss HM, Reul JMHM, Deussing JM, Eder M, Ressler KJ, Gassen NC, Chen A, Schmidt MV. The co-chaperone Fkbp5 shapes the acute stress response in the paraventricular nucleus of the hypothalamus of male mice. Mol Psychiatry 2021; 26:3060-3076. [PMID: 33649453 PMCID: PMC8505251 DOI: 10.1038/s41380-021-01044-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 01/19/2021] [Accepted: 02/02/2021] [Indexed: 01/31/2023]
Abstract
Disturbed activation or regulation of the stress response through the hypothalamic-pituitary-adrenal (HPA) axis is a fundamental component of multiple stress-related diseases, including psychiatric, metabolic, and immune disorders. The FK506 binding protein 51 (FKBP5) is a negative regulator of the glucocorticoid receptor (GR), the main driver of HPA axis regulation, and FKBP5 polymorphisms have been repeatedly linked to stress-related disorders in humans. However, the specific role of Fkbp5 in the paraventricular nucleus of the hypothalamus (PVN) in shaping HPA axis (re)activity remains to be elucidated. We here demonstrate that the deletion of Fkbp5 in Sim1+ neurons dampens the acute stress response and increases GR sensitivity. In contrast, Fkbp5 overexpression in the PVN results in a chronic HPA axis over-activation, and a PVN-specific rescue of Fkbp5 expression in full Fkbp5 KO mice normalizes the HPA axis phenotype. Single-cell RNA sequencing revealed the cell-type-specific expression pattern of Fkbp5 in the PVN and showed that Fkbp5 expression is specifically upregulated in Crh+ neurons after stress. Finally, Crh-specific Fkbp5 overexpression alters Crh neuron activity, but only partially recapitulates the PVN-specific Fkbp5 overexpression phenotype. Together, the data establish the central and cell-type-specific importance of Fkbp5 in the PVN in shaping HPA axis regulation and the acute stress response.
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Affiliation(s)
- Alexander S Häusl
- Research Group Neurobiology of Stress Resilience, Max Planck Institute of Psychiatry, Munich, Germany
| | - Lea M Brix
- Research Group Neurobiology of Stress Resilience, Max Planck Institute of Psychiatry, Munich, Germany
- International Max Planck Research School for Translational Psychiatry (IMPRS-TP), Munich, Germany
| | - Jakob Hartmann
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont, MA, USA
| | - Max L Pöhlmann
- Research Group Neurobiology of Stress Resilience, Max Planck Institute of Psychiatry, Munich, Germany
| | - Juan-Pablo Lopez
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Danusa Menegaz
- Electrophysiology Core Unit, Max Planck Institute of Psychiatry, Munich, Germany
| | - Elena Brivio
- International Max Planck Research School for Translational Psychiatry (IMPRS-TP), Munich, Germany
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Clara Engelhardt
- Research Group Neurobiology of Stress Resilience, Max Planck Institute of Psychiatry, Munich, Germany
| | - Simone Roeh
- Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany
| | - Thomas Bajaj
- Department of Psychiatry and Psychotherapy, Bonn Clinical Center, University of Bonn, Bonn, Germany
| | - Lisa Rudolph
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Rainer Stoffel
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Kathrin Hafner
- Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany
| | - Hannah M Goss
- Neuro-Epigenetics Research Group, Bristol Medical School, University of Bristol, Bristol, United Kingdom
| | - Johannes M H M Reul
- Neuro-Epigenetics Research Group, Bristol Medical School, University of Bristol, Bristol, United Kingdom
| | - Jan M Deussing
- Research Group Molecular Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Matthias Eder
- Electrophysiology Core Unit, Max Planck Institute of Psychiatry, Munich, Germany
| | - Kerry J Ressler
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont, MA, USA
| | - Nils C Gassen
- Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany
- Department of Psychiatry and Psychotherapy, Bonn Clinical Center, University of Bonn, Bonn, Germany
| | - Alon Chen
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Mathias V Schmidt
- Research Group Neurobiology of Stress Resilience, Max Planck Institute of Psychiatry, Munich, Germany.
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10
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Roderick JE, Gallagher KM, Murphy LC, O'Connor KW, Tang K, Zhang B, Brehm MA, Greiner DL, Yu J, Zhu LJ, Green MR, Kelliher MA. Prostaglandin E2 stimulates cAMP signaling and resensitizes human leukemia cells to glucocorticoid-induced cell death. Blood 2021; 137:500-512. [PMID: 33507291 PMCID: PMC7845005 DOI: 10.1182/blood.2020005712] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 07/27/2020] [Indexed: 12/14/2022] Open
Abstract
Glucocorticoid (GC) resistance remains a clinical challenge in pediatric acute lymphoblastic leukemia where response to GC is a reliable prognostic indicator. To identify GC resistance pathways, we conducted a genome-wide, survival-based, short hairpin RNA screen in murine T-cell acute lymphoblastic leukemia (T-ALL) cells. Genes identified in the screen interfere with cyclic adenosine monophosphate (cAMP) signaling and are underexpressed in GC-resistant or relapsed ALL patients. Silencing of the cAMP-activating Gnas gene interfered with GC-induced gene expression, resulting in dexamethasone resistance in vitro and in vivo. We demonstrate that cAMP signaling synergizes with dexamethasone to enhance cell death in GC-resistant human T-ALL cells. We find the E prostanoid receptor 4 expressed in T-ALL samples and demonstrate that prostaglandin E2 (PGE2) increases intracellular cAMP, potentiates GC-induced gene expression, and sensitizes human T-ALL samples to dexamethasone in vitro and in vivo. These findings identify PGE2 as a target for GC resensitization in relapsed pediatric T-ALL.
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MESH Headings
- 1-Methyl-3-isobutylxanthine/pharmacology
- Animals
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Cell Line, Tumor
- Child
- Chromogranins/antagonists & inhibitors
- Colforsin/pharmacology
- Cyclic AMP/pharmacology
- Cyclic AMP/physiology
- Dexamethasone/administration & dosage
- Dexamethasone/pharmacology
- Dinoprostone/administration & dosage
- Dinoprostone/antagonists & inhibitors
- Dinoprostone/pharmacology
- Dinoprostone/physiology
- Drug Resistance, Neoplasm/genetics
- Drug Resistance, Neoplasm/physiology
- Female
- GTP-Binding Protein alpha Subunits, Gs/antagonists & inhibitors
- GTP-Binding Protein alpha Subunits, Gs/deficiency
- Gene Expression Regulation, Leukemic/drug effects
- Humans
- Male
- Mice
- Models, Animal
- Molecular Targeted Therapy
- Neoplasm Proteins/biosynthesis
- Neoplasm Proteins/genetics
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/drug therapy
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/metabolism
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/pathology
- RNA Interference
- RNA, Small Interfering/genetics
- RNA, Small Interfering/pharmacology
- Radiation Chimera
- Receptors, Glucocorticoid/biosynthesis
- Receptors, Glucocorticoid/genetics
- Receptors, Glucocorticoid/physiology
- Receptors, Prostaglandin E, EP4 Subtype/biosynthesis
- Receptors, Prostaglandin E, EP4 Subtype/genetics
- Second Messenger Systems/drug effects
- Xenograft Model Antitumor Assays
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Affiliation(s)
| | | | | | | | | | | | - Michael A Brehm
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA
| | - Dale L Greiner
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA
| | - Jun Yu
- Department of Molecular, Cell, and Cancer Biology
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11
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Patt M, Gysi J, Faresse N, Cidlowski JA, Odermatt A. Protein phosphatase 1 alpha enhances glucocorticoid receptor activity by a mechanism involving phosphorylation of serine-211. Mol Cell Endocrinol 2020; 518:110873. [PMID: 32585168 PMCID: PMC7606615 DOI: 10.1016/j.mce.2020.110873] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 04/17/2020] [Accepted: 05/18/2020] [Indexed: 10/24/2022]
Abstract
By acting as a ligand-dependent transcription factor the glucocorticoid receptor (GR) mediates the actions of glucocorticoids and regulates many physiological processes. An impaired regulation of glucocorticoid action has been associated with numerous disorders. Thus, the elucidation of underlying signaling pathways is essential to understand mechanisms of disrupted glucocorticoid function and contribution to diseases. This study found increased GR transcriptional activity upon overexpression of protein phosphatase 1 alpha (PP1α) in HEK-293 cells and decreased expression levels of GR-responsive genes following PP1α knockdown in the endogenous A549 cell model. Mechanistic investigations revealed reduced phosphorylation of GR-Ser211 following PP1α silencing and provided a first indication for an involvement of glycogen synthase kinase 3 (GSK-3). Thus, the present study identified PP1α as a novel post-translational activator of GR signaling, suggesting that disruption of PP1α function could lead to impaired glucocorticoid action and thereby contribute to diseases.
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Affiliation(s)
- Melanie Patt
- Swiss Centre for Applied Human Toxicology (SCAHT), University of Basel, Missionsstrasse 64, 4055, Basel, Switzerland; Division of Molecular and Systems Toxicology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056, Basel, Switzerland.
| | - Joël Gysi
- Division of Molecular and Systems Toxicology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056, Basel, Switzerland.
| | | | - John A Cidlowski
- Signal Transduction Laboratory, NIEHS, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, 27709, USA.
| | - Alex Odermatt
- Swiss Centre for Applied Human Toxicology (SCAHT), University of Basel, Missionsstrasse 64, 4055, Basel, Switzerland; Division of Molecular and Systems Toxicology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056, Basel, Switzerland.
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12
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Kassouf T, Sumara G. Impact of Conventional and Atypical MAPKs on the Development of Metabolic Diseases. Biomolecules 2020; 10:biom10091256. [PMID: 32872540 PMCID: PMC7563211 DOI: 10.3390/biom10091256] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/25/2020] [Accepted: 08/26/2020] [Indexed: 02/06/2023] Open
Abstract
The family of mitogen-activated protein kinases (MAPKs) consists of fourteen members and has been implicated in regulation of virtually all cellular processes. MAPKs are divided into two groups, conventional and atypical MAPKs. Conventional MAPKs are further classified into four sub-families: extracellular signal-regulated kinases 1/2 (ERK1/2), c-Jun N-terminal kinase (JNK1, 2 and 3), p38 (α, β, γ, δ), and extracellular signal-regulated kinase 5 (ERK5). Four kinases, extracellular signal-regulated kinase 3, 4, and 7 (ERK3, 4 and 7) as well as Nemo-like kinase (NLK) build a group of atypical MAPKs, which are activated by different upstream mechanisms than conventional MAPKs. Early studies identified JNK1/2 and ERK1/2 as well as p38α as a central mediators of inflammation-evoked insulin resistance. These kinases have been also implicated in the development of obesity and diabetes. Recently, other members of conventional MAPKs emerged as important mediators of liver, skeletal muscle, adipose tissue, and pancreatic β-cell metabolism. Moreover, latest studies indicate that atypical members of MAPK family play a central role in the regulation of adipose tissue function. In this review, we summarize early studies on conventional MAPKs as well as recent findings implicating previously ignored members of the MAPK family. Finally, we discuss the therapeutic potential of drugs targeting specific members of the MAPK family.
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13
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Dwyer AR, Truong TH, Ostrander JH, Lange CA. 90 YEARS OF PROGESTERONE: Steroid receptors as MAPK signaling sensors in breast cancer: let the fates decide. J Mol Endocrinol 2020; 65:T35-T48. [PMID: 32209723 PMCID: PMC7329584 DOI: 10.1530/jme-19-0274] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 03/25/2020] [Indexed: 12/12/2022]
Abstract
Steroid hormone receptors (SRs) are classically defined as ligand-activated transcription factors that function as master regulators of gene programs important for a wide range of processes governing adult physiology, development, and cell or tissue homeostasis. A second function of SRs includes the ability to activate cytoplasmic signaling pathways. Estrogen (ER), androgen (AR), and progesterone (PR) receptors bind directly to membrane-associated signaling molecules including mitogenic protein kinases (i.e. c-SRC and AKT), G-proteins, and ion channels to mediate context-dependent actions via rapid activation of downstream signaling pathways. In addition to making direct contact with diverse signaling molecules, SRs are further fully integrated with signaling pathways by virtue of their N-terminal phosphorylation sites that act as regulatory hot-spots capable of sensing the signaling milieu. In particular, ER, AR, PR, and closely related glucocorticoid receptors (GR) share the property of accepting (i.e. sensing) ligand-independent phosphorylation events by proline-directed kinases in the MAPK and CDK families. These signaling inputs act as a 'second ligand' that dramatically impacts cell fate. In the face of drugs that reliably target SR ligand-binding domains to block uncontrolled cancer growth, ligand-independent post-translational modifications guide changes in cell fate that confer increased survival, EMT, migration/invasion, stemness properties, and therapy resistance of non-proliferating SR+ cancer cell subpopulations. The focus of this review is on MAPK pathways in the regulation of SR+ cancer cell fate. MAPK-dependent phosphorylation of PR (Ser294) and GR (Ser134) will primarily be discussed in light of the need to target changes in breast cancer cell fate as part of modernized combination therapies.
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Affiliation(s)
- Amy R. Dwyer
- Masonic Cancer Center, University of Minnesota, Minneapolis MN 55455
| | - Thu H. Truong
- Masonic Cancer Center, University of Minnesota, Minneapolis MN 55455
| | - Julie H. Ostrander
- Masonic Cancer Center, University of Minnesota, Minneapolis MN 55455
- Department of Medicine (Division of Hematology, Oncology, and Transplantation), University of Minnesota, Minneapolis MN 55455
| | - Carol A. Lange
- Masonic Cancer Center, University of Minnesota, Minneapolis MN 55455
- Department of Medicine (Division of Hematology, Oncology, and Transplantation), University of Minnesota, Minneapolis MN 55455
- Department of Pharmacology, University of Minnesota, Minneapolis MN 55455
- Corresponding author: Carol A Lange, Professor, ; 612-626-0621 (phone), University of Minnesota Masonic Cancer Center, Delivery Code 2812, Cancer and Cardiovascular Research Building, 2231 6th St SE, Minneapolis, MN 55455, USA
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14
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Yamanaka K, Okuda M, Mizuno T. Functional characterization of canine wild type glucocorticoid receptor and an insertional mutation in a dog. BMC Vet Res 2019; 15:363. [PMID: 31651346 PMCID: PMC6813069 DOI: 10.1186/s12917-019-2129-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 10/02/2019] [Indexed: 11/22/2022] Open
Abstract
Background Glucocorticoids, among the most widely utilized drugs in veterinary medicine, are employed to treat a wide variety of diseases; however, their use often induces adverse events in dogs. The efficacy of glucocorticoids usually depends on dosage, although differences in sensitivity to glucocorticoids in individual animals have been reported. Glucocorticoids bind to the cytoplasmic glucocorticoid receptor (GR), which is expressed in almost all cells. These receptors are key factors in determining individual sensitivity to glucocorticoids. This study examined individual differences in glucocorticoid sensitivity in dogs, focusing on reactivity of the GR to prednisolone. Results We first molecularly cloned the GR gene from a healthy dog. We discovered a mutant GR in a dog suspected to have iatrogenic Cushing syndrome. The mutant GR had extra nucleotides between exons 6 and 7, resulting in a truncated form of GR that was 98 amino acids shorter than the wild-type dog GR. The truncated GR exhibited very low reactivity to prednisolone, irrespective of concentration. Conclusions We have identified the truncated form of canine GR in a dog with iatrogenic Cushing syndrome. This truncated form showed the very less sensitivity to glucocorticoid in vitro, unfortunately, we could not elucidate its clinical significance. However, our data is a first report about the function of canine GR, and will facilitate the analysis of canine glucocorticoid sensitivity.
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Affiliation(s)
- Kosei Yamanaka
- Laboratory of Molecular Diagnostics and Therapeutics, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, 753-8515, Japan
| | - Masaru Okuda
- Laboratory of Veterinary Internal Medicine, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, 753-8515, Japan
| | - Takuya Mizuno
- Laboratory of Molecular Diagnostics and Therapeutics, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, 753-8515, Japan.
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15
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Timmermans S, Souffriau J, Libert C. A General Introduction to Glucocorticoid Biology. Front Immunol 2019; 10:1545. [PMID: 31333672 PMCID: PMC6621919 DOI: 10.3389/fimmu.2019.01545] [Citation(s) in RCA: 282] [Impact Index Per Article: 56.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Accepted: 06/20/2019] [Indexed: 12/13/2022] Open
Abstract
Glucocorticoids (GCs) are steroid hormones widely used for the treatment of inflammation, autoimmune diseases, and cancer. To exert their broad physiological and therapeutic effects, GCs bind to the GC receptor (GR) which belongs to the nuclear receptor superfamily of transcription factors. Despite their success, GCs are hindered by the occurrence of side effects and glucocorticoid resistance (GCR). Increased knowledge on GC and GR biology together with a better understanding of the molecular mechanisms underlying the GC side effects and GCR are necessary for improved GC therapy development. We here provide a general overview on the current insights in GC biology with a focus on GC synthesis, regulation and physiology, role in inflammation inhibition, and on GR function and plasticity. Furthermore, novel and selective therapeutic strategies are proposed based on recently recognized distinct molecular mechanisms of the GR. We will explain the SEDIGRAM concept, which was launched based on our research results.
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Affiliation(s)
- Steven Timmermans
- Center for Inflammation Research, VIB, Ghent, Belgium.,Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Jolien Souffriau
- Center for Inflammation Research, VIB, Ghent, Belgium.,Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Claude Libert
- Center for Inflammation Research, VIB, Ghent, Belgium.,Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
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16
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Petrillo MG, Oakley RH, Cidlowski JA. β-Arrestin-1 inhibits glucocorticoid receptor turnover and alters glucocorticoid signaling. J Biol Chem 2019; 294:11225-11239. [PMID: 31167788 DOI: 10.1074/jbc.ra118.007150] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 05/30/2019] [Indexed: 01/14/2023] Open
Abstract
Glucocorticoids are among the most widely used drugs to treat many autoimmune and inflammatory diseases. Although much research has been focused on investigating glucocorticoid activity, it remains unclear how glucocorticoids regulate distinct processes in different cells. Glucocorticoids exert their effects through the glucocorticoid receptor (GR), which, upon glucocorticoid binding, interacts with regulatory proteins, affecting its activity and function. These protein-protein interactions are necessary for the resolution of glucocorticoid-dependent physiological and pharmacological processes. In this study, we discovered a novel protein interaction between the glucocorticoid receptor and β-arrestin-1, a scaffold protein with a well-established role in G protein-coupled receptor signaling. Using co-immunoprecipitation and in situ proximity ligation assays in A549 cells, we observed that β-arrestin-1 and unliganded GR interact in the cytoplasm and that, following glucocorticoid binding, the protein complex is found in the nucleus. We show that siRNA-mediated β-arrestin-1 knockdown alters GR protein turnover by up-regulating the E3 ubiquitin ligase Pellino-1, which catalyzes GR ubiquitination and thereby marks the receptor for proteasomal degradation. The enhanced GR turnover observed in β-arrestin-1-deficient cells limits the duration of the glucocorticoid response on GR target genes. These results demonstrate that β-arrestin-1 is a crucial player for the stability of the glucocorticoid receptor. The GR/β-arrestin-1 interaction uncovered here may help unravel mechanisms that contribute to the cell type-specific activities of glucocorticoids.
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Affiliation(s)
- Maria G Petrillo
- Signal Transduction Laboratory, NIEHS, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina 27709
| | - Robert H Oakley
- Signal Transduction Laboratory, NIEHS, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina 27709
| | - John A Cidlowski
- Signal Transduction Laboratory, NIEHS, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina 27709
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17
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Role of Phosphorylation in the Modulation of the Glucocorticoid Receptor's Intrinsically Disordered Domain. Biomolecules 2019; 9:biom9030095. [PMID: 30862072 PMCID: PMC6468654 DOI: 10.3390/biom9030095] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 02/18/2019] [Accepted: 02/21/2019] [Indexed: 11/25/2022] Open
Abstract
Protein phosphorylation often switches cellular activity from one state to another, and this post-translational modification plays an important role in gene regulation by the nuclear hormone receptor superfamily, including the glucocorticoid receptor (GR). Cell signaling pathways that regulate phosphorylation of the GR are important determinants of GR actions, including lymphoid cell apoptosis, DNA binding, and interaction with coregulatory proteins. All major functionally important phosphorylation sites in the human GR are located in its N-terminal domain (NTD), which possesses a powerful transactivation domain, AF1. The GR NTD exists as an intrinsically disordered protein (IDP) and undergoes disorder-order transition for AF1’s efficient interaction with several coregulatory proteins and subsequent AF1-mediated GR activity. It has been reported that GR’s NTD/AF1 undergoes such disorder-order transition following site-specific phosphorylation. This review provides currently available information regarding the role of GR phosphorylation in its action and highlights the possible underlying mechanisms of action.
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18
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Relapse-associated AURKB blunts the glucocorticoid sensitivity of B cell acute lymphoblastic leukemia. Proc Natl Acad Sci U S A 2019; 116:3052-3061. [PMID: 30733284 DOI: 10.1073/pnas.1816254116] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Glucocorticoids (GCs) are used in combination chemotherapies as front-line treatment for B cell acute lymphoblastic leukemia (B-ALL). Although effective, many patients relapse and become resistant to chemotherapy and GCs in particular. Why these patients relapse is not clear. We took a comprehensive, functional genomics approach to identify sources of GC resistance. A genome-wide shRNA screen identified the transcriptional coactivators EHMT2, EHMT1, and CBX3 as important contributors to GC-induced cell death. This complex selectively supports GC-induced expression of genes contributing to cell death. A metaanalysis of gene expression data from B-ALL patient specimens revealed that Aurora kinase B (AURKB), which restrains GC signaling by phosphorylating EHMT1-2, is overexpressed in relapsed B-ALL, suggesting it as a potential contributor to relapse. Inhibition of AURKB enhanced GC-induced expression of cell death genes, resulting in potentiation of GC cytotoxicity in cell lines and relapsed B-ALL patient samples. This function for AURKB is distinct from its canonical role in the cell cycle. These results show the utility of functional genomics in understanding mechanisms of resistance and rapidly identifying combination chemotherapeutics.
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19
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McNamara KM, Kannai A, Sasano H. Possible roles for glucocorticoid signalling in breast cancer. Mol Cell Endocrinol 2018; 466:38-50. [PMID: 28687451 DOI: 10.1016/j.mce.2017.07.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 07/03/2017] [Accepted: 07/03/2017] [Indexed: 12/15/2022]
Abstract
Our understanding of breast cancer biology, and our ability to manipulate breast cancers have grown exponentially in the last 20 years. Much of that expansion has focused on the roles of steroids in driving these neoplasms. Initially this research focused on estrogens and progesterone receptors, and more recently on androgen actions in breast cancers. This review aims to make the case for glucocorticoids as the next essential steroid subclass that contributes significantly to our understanding of steroidogenic regulation of these neoplasms. Glucocorticoids have the potential to play multiple roles in the regulation of breast cancers including their control of cellular differentiation, apoptosis and proliferation. Beyond this they also act as a master integrator of organ homeostats in relation to such as circadian rhythms and stress responses. Therefore a better understanding of glucocorticoids and breast cancer could help to explain some of the epidemiological links between circadian disruption and/or stress and breast cancer development. Finally glucocorticoids are currently used during chemotherapeutic treatment in breast cancer therapy and yet results of various studies suggest that this may have an adverse impact on treatment success. This review aims to summarise the current evidence for glucocorticoids as actors in breast cancer and then suggest future essential approaches in order to determine the roles of glucocorticoids in this disease.
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Affiliation(s)
- Keely M McNamara
- Department of Anatomical Pathology, School of Graduate Medicine, Tohoku University, Sendai, Japan.
| | - Ayako Kannai
- Department of Anatomical Pathology, School of Graduate Medicine, Tohoku University, Sendai, Japan
| | - Hironobu Sasano
- Department of Anatomical Pathology, School of Graduate Medicine, Tohoku University, Sendai, Japan
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20
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Kino T. GR-regulating Serine/Threonine Kinases: New Physiologic and Pathologic Implications. Trends Endocrinol Metab 2018; 29:260-270. [PMID: 29501228 DOI: 10.1016/j.tem.2018.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 12/17/2022]
Abstract
Glucocorticoid hormones, end products of the hypothalamic-pituitary-adrenal axis, virtually influence all human functions both in a basal homeostatic condition and under stress. The glucocorticoid receptor (GR), a nuclear hormone receptor superfamily protein, mediates these actions of glucocorticoids by acting as a ligand-dependent transcription factor. Because glucocorticoid actions are diverse and strong, many biological pathways adjust them in local tissues by targeting the GR signaling pathway as part of the regulatory loop coordinating complex human functions. Phosphorylation of GR protein by serine/threonine kinases is one of the major regulatory mechanisms for this communication. In this review, recent progress in research investigating GR phosphorylation by these kinases is discussed, along with the possible physiologic and pathophysiologic implications.
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Affiliation(s)
- Tomoshige Kino
- Department of Human Genetics, Division of Translational Medicine, Sidra Medical and Research Center, Doha 26999, Qatar.
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21
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Qattan MY, Bakker EY, Rajendran R, Chen DWC, Saha V, Liu J, Zeef L, Schwartz JM, Mutti L, Demonacos C, Krstic-Demonacos M. Differential regulation of cell death pathways by the microenvironment correlates with chemoresistance and survival in leukaemia. PLoS One 2017; 12:e0178606. [PMID: 28582465 PMCID: PMC5459454 DOI: 10.1371/journal.pone.0178606] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 05/16/2017] [Indexed: 12/22/2022] Open
Abstract
Glucocorticoids (GCs) and topoisomerase II inhibitors are used to treat acute lymphoblastic leukaemia (ALL) as they induce death in lymphoid cells through the glucocorticoid receptor (GR) and p53 respectively. Mechanisms underlying ALL cell death and the contribution of the bone marrow microenvironment to drug response/resistance remain unclear. The role of the microenvironment and the identification of chemoresistance determinants were studied by transcriptomic analysis in ALL cells treated with Dexamethasone (Dex), and Etoposide (Etop) grown in the presence or absence of bone marrow conditioned media (CM). The necroptotic (RIPK1) and the apoptotic (caspase-8/3) markers were downregulated by CM, whereas the inhibitory effects of chemotherapy on the autophagy marker Beclin-1 (BECN1) were reduced suggesting CM exerts cytoprotective effects. GCs upregulated the RIPK1 ubiquitinating factor BIRC3 (cIAP2), in GC-sensitive (CEM-C7-14) but not in resistant (CEM-C1-15) cells. In addition, CM selectively affected GR phosphorylation in a site and cell-specific manner. GR is recruited to RIPK1, BECN1 and BIRC3 promoters in the sensitive but not in the resistant cells with phosphorylated GR forms being generally less recruited in the presence of hormone. FACS analysis and caspase-8 assays demonstrated that CM promoted a pro-survival trend. High molecular weight proteins reacting with the RIPK1 antibody were modified upon incubation with the BIRC3 inhibitor AT406 in CEM-C7-14 cells suggesting that they represent ubiquitinated forms of RIPK1. Our data suggest that there is a correlation between microenvironment-induced ALL proliferation and altered response to chemotherapy.
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Affiliation(s)
- Malak Yahia Qattan
- College of Applied Medical Sciences and Community Services (CAMS&CS), King Saud University, Riyadh, Saudi Arabia
| | - Emyr Yosef Bakker
- School of Environment and Life Sciences, University of Salford, Salford, United Kingdom
| | - Ramkumar Rajendran
- School of Pharmacy, International Medical University, Kuala Lumpur, Malaysia
| | - Daphne Wei-Chen Chen
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Vaskar Saha
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
- Tata Translational Cancer Research Centre, Kolkata, India
| | - Jizhong Liu
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Leo Zeef
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Jean-Marc Schwartz
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Luciano Mutti
- School of Environment and Life Sciences, University of Salford, Salford, United Kingdom
| | - Constantinos Demonacos
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Marija Krstic-Demonacos
- School of Environment and Life Sciences, University of Salford, Salford, United Kingdom
- * E-mail:
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22
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Brossaud J, Roumes H, Helbling JC, Moisan MP, Pallet V, Ferreira G, Biyong EF, Redonnet A, Corcuff JB. Retinoic acid increases glucocorticoid receptor phosphorylation via cyclin-dependent kinase 5. Mol Cell Neurosci 2017; 82:96-104. [PMID: 28477983 DOI: 10.1016/j.mcn.2017.05.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 04/25/2017] [Accepted: 05/01/2017] [Indexed: 12/20/2022] Open
Abstract
Glucocorticoid receptor (GR) function is modulated by phosphorylation. As retinoic acid (RA) can activate some cytoplasmic kinases able to phosphorylate GR, we investigated whether RA could modulate GR phosphorylation in neuronal cells in a context of long-term glucocorticoid exposure. A 4-day treatment of dexamethasone (Dex) plus RA, showed that RA potentiated the (Dex)-induced phosphorylation on GR Serine 220 (pSer220GR) in the nucleus of a hippocampal HT22 cell line. This treatment increased the cytoplasmic ratio of p35/p25 proteins, which are major CDK5 cofactors. Roscovitine, a pharmacological CDK5 inhibitor, or a siRNA against CDK5 prevented RA potentiation of GR phosphorylation. Furthermore, roscovitine counter-acted the effect of RA on GR sensitive target proteins such as BDNF or tissue-transglutaminase. These data help understanding the interaction between RA- and glucocorticoid-signalling pathways, both of which have strong influences on the adult brain.
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Affiliation(s)
- Julie Brossaud
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France; Departments of Nuclear Medicine University Hospital and University of Bordeaux, France.
| | - Hélène Roumes
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | | | - Marie-Pierre Moisan
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Véronique Pallet
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Guillaume Ferreira
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Essi-Fanny Biyong
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Anabelle Redonnet
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Jean-Benoît Corcuff
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France; Departments of Nuclear Medicine University Hospital and University of Bordeaux, France
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Suppression of B-cell development genes is key to glucocorticoid efficacy in treatment of acute lymphoblastic leukemia. Blood 2017; 129:3000-3008. [PMID: 28424165 DOI: 10.1182/blood-2017-02-766204] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 03/29/2017] [Indexed: 12/23/2022] Open
Abstract
Glucocorticoids (GCs), including dexamethasone (dex), are a central component of combination chemotherapy for childhood B-cell precursor acute lymphoblastic leukemia (B-ALL). GCs work by activating the GC receptor (GR), a ligand-induced transcription factor, which in turn regulates genes that induce leukemic cell death. Which GR-regulated genes are required for GC cytotoxicity, which pathways affect their regulation, and how resistance arises are not well understood. Here, we systematically integrate the transcriptional response of B-ALL to GCs with a next-generation short hairpin RNA screen to identify GC-regulated "effector" genes that contribute to cell death, as well as genes that affect the sensitivity of B-ALL cells to dex. This analysis reveals a pervasive role for GCs in suppression of B-cell development genes that is linked to therapeutic response. Inhibition of phosphatidylinositol 3-kinase δ (PI3Kδ), a linchpin in the pre-B-cell receptor and interleukin 7 receptor signaling pathways critical to B-cell development (with CAL-101 [idelalisib]), interrupts a double-negative feedback loop, enhancing GC-regulated transcription to synergistically kill even highly resistant B-ALL with diverse genetic backgrounds. This work not only identifies numerous opportunities for enhanced lymphoid-specific combination chemotherapies that have the potential to overcome treatment resistance, but is also a valuable resource for understanding GC biology and the mechanistic details of GR-regulated transcription.
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Weikum ER, Knuesel MT, Ortlund EA, Yamamoto KR. Glucocorticoid receptor control of transcription: precision and plasticity via allostery. Nat Rev Mol Cell Biol 2017; 18:159-174. [PMID: 28053348 PMCID: PMC6257982 DOI: 10.1038/nrm.2016.152] [Citation(s) in RCA: 338] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The glucocorticoid receptor (GR) is a constitutively expressed transcriptional regulatory factor (TRF) that controls many distinct gene networks, each uniquely determined by particular cellular and physiological contexts. The precision of GR-mediated responses seems to depend on combinatorial, context-specific assembly of GR-nucleated transcription regulatory complexes at genomic response elements. In turn, evidence suggests that context-driven plasticity is conferred by the integration of multiple signals, each serving as an allosteric effector of GR conformation, a key determinant of regulatory complex composition and activity. This structural and mechanistic perspective on GR regulatory specificity is likely to extend to other eukaryotic TRFs.
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Affiliation(s)
- Emily R Weikum
- Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, Georgia 30322, USA
| | - Matthew T Knuesel
- Department of Cellular and Molecular Pharmacology, University of California San Francisco School of Medicine, 600 16th Street, San Francisco, California 94143, USA
| | - Eric A Ortlund
- Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, Georgia 30322, USA
| | - Keith R Yamamoto
- Department of Cellular and Molecular Pharmacology, University of California San Francisco School of Medicine, 600 16th Street, San Francisco, California 94143, USA
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25
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Nakatani Y, Amano T, Takeda H. Corticosterone Inhibits the Proliferation of C6 Glioma Cells via the Translocation of Unphosphorylated Glucocorticoid Receptor. Biol Pharm Bull 2017; 39:1121-9. [PMID: 27374287 DOI: 10.1248/bpb.b16-00017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Astroglial cells have been considered to have passive brain function by helping to maintain neurons. However, recent studies have revealed that the dysfunction of such passive functions may be associated with various neuropathological diseases, such as schizophrenia, Alzheimer's disease, amyotrophic lateral sclerosis and major depression. Corticosterone (CORT), which is often referred to as the stress hormone, is a well-known regulator of peripheral immune responses and also shows anti-inflammatory properties in the brain. However, it is still obscure how CORT affects astroglial cell function. In this study, we investigated the effects of CORT on the proliferation and survival of astroglial cells using C6 glioma cells. Under treatment with CORT for 24h, the proliferation of C6 glioma cells decreased in a dose-dependent manner. Moreover, this inhibition was diminised by treatment with mifepristone, a glucocorticoid receptor (GR) antagonist, but not by spironolactone, a mineralocorticoid receptor (MR) antagonist, and was independent of GR phosphorylation and other GR-related intracellular signaling cascades. Furthermore, it was observed that the translocation of GR from the cytosol to the nucleus was promoted by the treatment with CORT. These results indicate that CORT decreases the proliferation of C6 glioma cells by modifying the transcription of a particular gene related to cell proliferation independent of GR phosphorylation.
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Affiliation(s)
- Yoshihiko Nakatani
- Department of Pharmacology, School of Pharmacy, International University of Health and Welfare
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26
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Kassi E, Nasiri-Ansari N, Spilioti E, Kalotychou V, Apostolou PE, Moutsatsou P, Papavassiliou AG. Vitamin D interferes with glucocorticoid responsiveness in human peripheral blood mononuclear target cells. Cell Mol Life Sci 2016; 73:4341-4354. [PMID: 27220430 PMCID: PMC11108367 DOI: 10.1007/s00018-016-2281-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 05/06/2016] [Accepted: 05/19/2016] [Indexed: 11/27/2022]
Abstract
Glucocorticoids (GCs) are widely used in the treatment of inflammatory and autoimmune diseases; however, patients are often resistant to GC effects. Current studies indicate that vitamin D reduces the risk or modifies the course of autoimmune diseases posing vitamin D supplementation as a prevention or therapeutic option. Herein, we investigated whether vitamin D can modify the response to GCs at the molecular level. To this end, peripheral blood mononuclear cells (PBMCs) were isolated from healthy vitamin D-deficient women and incubated with either the active metabolite 1,25(OH)2D3 (VitD) for 11 days or dexamethasone (Dex) for the last 2 days in the presence or absence of VitD. Ex vivo GC sensitivity was assessed by the expression of the glucocorticoid receptor (GR) responsive gene GILZ with RT-PCR. Long-term incubation of PBMCs with VitD significantly decreased the Dex-induced augmentation of GILZ expression. Since the intracellular concentration of GR and the GR nuclear translocation are critical determinants of GC sensitivity, we next evaluated the effect of VitD on these factors. RT-PCR and western-blot analysis revealed that VitD reduced the expression of GR. This effect was abolished by the HDAC-specific inhibitor trichostatin A, implying that HDAC was implicated in this effect. Moreover, NCoR1 mRNA was significantly decreased upon treatment with VitD either alone or as pre-treatment to Dex, suggesting that a possible increase in expression of this co-repressor was not involved. In addition, immunofluorescence analysis showed that VitD hindered the Dex-induced GRα nuclear translocation, an effect verified by subcellular fractionation and western-blot experiments. To further explore the underpinning mechanism, we examined the potential of VitD to: (1) strengthen the FK506-binding protein 5 (FKBP5) negative feedback loop and (2) modify the phosphorylation status of GR. Remarkably, VitD decreased FKBP5 expression and decreased phosphorylation at Ser211, while enhancing phosphorylation of GR at Ser203. Overall, VitD decreases the ex vivo GC sensitivity and this effect is, at least in part, attributed both to decrease of GR expression owing to a mechanism that engages HDAC and inhibition of GR translocation to nucleus via differential modulation of the phosphorylation state of GR. Our study provides, for the first time, evidence that long-term action of VitD induces GC resistance in PBMCs from healthy volunteers and offers a possible mechanistic basis for VitD-triggered attenuation of GC effects.
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Affiliation(s)
- Eva Kassi
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75, M. Asias Street, 11527, Athens, Greece
| | - Narjes Nasiri-Ansari
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75, M. Asias Street, 11527, Athens, Greece
| | - Eliana Spilioti
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75, M. Asias Street, 11527, Athens, Greece
| | - Vassiliki Kalotychou
- First Department of Internal Medicine, Medical School, National and Kapodistrian University of Athens, 'Laikon' General Hospital, 11527, Athens, Greece
| | - Panagiota E Apostolou
- Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527, Athens, Greece
| | - Paraskevi Moutsatsou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75, M. Asias Street, 11527, Athens, Greece
| | - Athanasios G Papavassiliou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75, M. Asias Street, 11527, Athens, Greece.
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The Interactome of the Glucocorticoid Receptor and Its Influence on the Actions of Glucocorticoids in Combatting Inflammatory and Infectious Diseases. Microbiol Mol Biol Rev 2016; 80:495-522. [PMID: 27169854 DOI: 10.1128/mmbr.00064-15] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Glucocorticoids (GCs) have been widely used for decades as a first-line treatment for inflammatory and autoimmune diseases. However, their use is often hampered by the onset of adverse effects or resistance. GCs mediate their effects via binding to glucocorticoid receptor (GR), a transcription factor belonging to the family of nuclear receptors. An important aspect of GR's actions, including its anti-inflammatory capacity, involves its interactions with various proteins, such as transcription factors, cofactors, and modifying enzymes, which codetermine receptor functionality. In this review, we provide a state-of-the-art overview of the protein-protein interactions (PPIs) of GR that positively or negatively affect its anti-inflammatory properties, along with mechanistic insights, if known. Emphasis is placed on the interactions that affect its anti-inflammatory effects in the presence of inflammatory and microbial diseases.
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28
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Caratti G, Matthews L, Poolman T, Kershaw S, Baxter M, Ray D. Glucocorticoid receptor function in health and disease. Clin Endocrinol (Oxf) 2015; 83:441-8. [PMID: 25627931 DOI: 10.1111/cen.12728] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 12/17/2014] [Accepted: 01/19/2015] [Indexed: 12/20/2022]
Abstract
Glucocorticoid hormones are essential for life in vertebrates. They act through the glucocorticoid receptor (GR), which is expressed in virtually all cells of the human body. Yet the actions of glucocorticoids (GCs) are specific to particular cell types. Broadly GCs regulate carbohydrate metabolism, inflammation, stress and cell fate. Synthetic GCs are widely used in medicine and are by far the most frequent cause of Cushing's syndrome in routine practice. The advent of novel drugs targeting the GR offers new opportunities to treat patients with immune, or malignant disease, and may also offer new opportunities to manage patients with adrenal insufficiency also. This review covers the latest understanding of how GCs work, how their actions are affected by disease, and where the new drugs may take us.
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Affiliation(s)
- Giorgio Caratti
- Centre for Endocrinology and Diabetes, University of Manchester, Manchester, UK
| | - Laura Matthews
- Centre for Endocrinology and Diabetes, University of Manchester, Manchester, UK
| | - Toryn Poolman
- Centre for Endocrinology and Diabetes, University of Manchester, Manchester, UK
| | | | - Matthew Baxter
- Centre for Endocrinology and Diabetes, University of Manchester, Manchester, UK
| | - David Ray
- Centre for Endocrinology and Diabetes, University of Manchester, Manchester, UK
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Pan XY, Wang Y, Su J, Huang GX, Cao DM, Qu S, Lu J. The mechanism and significance of synergistic induction of the expression of plasminogen activator inhibitor-1 by glucocorticoid and transforming growth factor beta in human ovarian cancer cells. Mol Cell Endocrinol 2015; 407:37-45. [PMID: 25770462 DOI: 10.1016/j.mce.2015.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 03/05/2015] [Accepted: 03/06/2015] [Indexed: 11/17/2022]
Abstract
Plasminogen activator inhibitor-1 (PAI-1) plays a key role in tissue remodeling and tumor development by suppression of plasminogen activator function. Glucocorticoids (GCs) and transforming growth factor beta (TGF-β) signal pathways cross-talk to regulate gene expression, but the mechanism is poorly understood. Here we investigated the mechanism and significance of co-regulation of PAI-1 by TGF-β and dexamethasone (DEX), a synthetic glucocorticoid in ovarian cancer cells. We found that TGF-β and DEX showed rapidly synergistic induction of PAI-1 expression, which contributed to the early pro-adhesion effects. The synergistic induction effect was accomplished by several signal pathways, including GC receptor (GR) pathway and TGF-β-activated p38MAPK, ERK and Smad3 pathways. TGF-β-activated p38MAPK and ERK pathways cross-talked with GR pathway to augment the expression of PAI-1 through enhancing DEX-induced GR phosphorylation at Ser211 in ovarian cancer cells. These findings reveal possible novel mechanisms by which TGF-β pathways cooperatively cross-talk with GR pathway to regulate gene expression.
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Affiliation(s)
- Xiao-yu Pan
- Department of Endocrinology, Shanghai 10th People's Hospital, Tongji University, Shanghai 200072, China
| | - Yan Wang
- Department of Pathophysiology, The Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Jie Su
- Department of Pathophysiology, The Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Gao-xiang Huang
- Department of Pathophysiology, The Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Dong-mei Cao
- Department of Pathophysiology, The Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Shen Qu
- Department of Endocrinology, Shanghai 10th People's Hospital, Tongji University, Shanghai 200072, China
| | - Jian Lu
- Department of Pathophysiology, The Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.
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30
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Duma D, Cidlowski JA. Generating diversity in glucocorticoid receptor signaling: mechanisms, receptor isoforms, and post-translational modifications. Horm Mol Biol Clin Investig 2015; 3:319-28. [PMID: 25961204 DOI: 10.1515/hmbci.2010.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Accepted: 07/30/2010] [Indexed: 11/15/2022]
Abstract
Glucocorticoids are necessary for life after birth and regulate numerous homeostatic functions in man, including glucose homeostasis, protein catabolism, skeletal growth, respiratory function, inflammation, development, behavior, and apoptosis. In a clinical setting, they are widely used as anti-inflammatory agents to control both acute and chronic inflammation. Unfortunately, owing to their broad range of physiological actions, patients treated with glucocorticoids for long periods of time experience a variety of serious side effects, including metabolic syndrome, bone loss, and psychiatric disorders including depression, mania, and psychosis. Our understanding of how one hormone or drug regulates all of these diverse processes is limited. Recent studies have shown that multiple glucocorticoid receptor isoforms are produced from one gene via combinations of alternative mRNA splicing and alternative translation initiation. These isoforms possess unique tissue distribution patterns and transcriptional regulatory profiles. Owing to variation in the N-terminal and C-terminal length of glucocorticoid receptor isoforms, different post-translational modifications including ubiquitination, phosphorylation, and sumoylation are predicted, contributing to the complexity of glucocorticoid signaling. Furthermore, increasing evidence suggests that unique glucocorticoid receptor isoform compositions within cells could determine the cell-specific response to glucocorticoids. In this review, we will outline the recent advances made in the characterization of the transcriptional activity and the selective regulation of apoptosis by the various glucocorticoid receptor isoforms.
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31
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Tesic V, Perovic M, Lazic D, Kojic S, Smiljanic K, Ruzdijic S, Rakic L, Kanazir S. Long-term intermittent feeding restores impaired GR signaling in the hippocampus of aged rat. J Steroid Biochem Mol Biol 2015; 149:43-52. [PMID: 25616002 DOI: 10.1016/j.jsbmb.2015.01.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Revised: 01/15/2015] [Accepted: 01/19/2015] [Indexed: 11/22/2022]
Abstract
Diminished glucocorticoid signaling is associated with an age-related decline in hippocampal functioning. In this study we demonstrate the effect of intermittent, every other day (EOD) feeding on the glucocorticoid hormone/glucocorticoid receptor (GR) system in the hippocampus of middle-aged (18-month-old) and aged (24-month-old) Wistar rats. In aged ad libitum-fed rats, a decrease in the level of total GR and GR phosphorylated at Ser(232) (pGR) was detected. Conversely, aged rats subjected to EOD feeding, starting from 6 months of age, showed an increase in GR and pGR levels and a higher content of hippocampal corticosterone. Furthermore, prominent nuclear staining of pGR was observed in CA1 pyramidal and DG granule neurons of aged EOD-fed rats. These changes were accompanied by increased Sgk-1 and decreased GFAP transcription, pointing to upregulated transcriptional activity of GR. EOD feeding also induced an increase in the expression of the mineralocorticoid receptor. Our results reveal that intermittent feeding restores impaired GR signaling in the hippocampus of aged animals by inducing rather than by stabilizing GR signaling during aging.
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Affiliation(s)
- Vesna Tesic
- Institute for Biological Research, University of Belgrade, Belgrade, Serbia
| | - Milka Perovic
- Institute for Biological Research, University of Belgrade, Belgrade, Serbia
| | - Divna Lazic
- Institute for Biological Research, University of Belgrade, Belgrade, Serbia
| | - Snezana Kojic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Kosara Smiljanic
- Institute for Biological Research, University of Belgrade, Belgrade, Serbia
| | - Sabera Ruzdijic
- Institute for Biological Research, University of Belgrade, Belgrade, Serbia
| | | | - Selma Kanazir
- Institute for Biological Research, University of Belgrade, Belgrade, Serbia.
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Novel antidepressant-like activity of caffeic Acid phenethyl ester is mediated by enhanced glucocorticoid receptor function in the hippocampus. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:646039. [PMID: 25477995 PMCID: PMC4248557 DOI: 10.1155/2014/646039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 09/16/2014] [Accepted: 09/17/2014] [Indexed: 11/17/2022]
Abstract
Caffeic acid phenethyl ester (CAPE) is an active component of propolis that has a variety of potential pharmacological effects. Although we previously demonstrated that propolis has antidepressant-like activity, the effect of CAPE on this activity remains unknown. The present study assessed whether treatment with CAPE (5, 10, and 20 µmol/kg for 21 days) has an antidepressant-like effect in mice subjected to chronic unpredictable stress via tail suspension (TST) and forced swim (FST) tests. CAPE administration induced behaviors consistent with an antidepressant effect, evidenced by decreased immobility in the TST and FST independent of any effect on serum corticosterone secretion. Western blots, conducted subsequent to behavioral assessment, revealed that CAPE significantly decreased glucocorticoid receptor phosphorylation at S234 (pGR(S234)), resulting in an increased pGR(S220/S234) ratio. We also observed negative correlations between pGR(S220)/(S234) and p38 mitogen-activated protein kinase (p38MAPK) phosphorylation, which was decreased by CAPE treatment. These findings suggest that CAPE treatment exerts an antidepressant-like effect via downregulation of p38MAPK phosphorylation, thereby contributing to enhanced GR function.
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Vandevyver S, Dejager L, Libert C. Comprehensive overview of the structure and regulation of the glucocorticoid receptor. Endocr Rev 2014; 35:671-93. [PMID: 24937701 DOI: 10.1210/er.2014-1010] [Citation(s) in RCA: 163] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Glucocorticoids are among the most prescribed drugs worldwide for the treatment of numerous immune and inflammatory disorders. They exert their actions by binding to the glucocorticoid receptor (GR), a member of the nuclear receptor superfamily. There are several GR isoforms resulting from alternative RNA splicing and translation initiation of the GR transcript. Additionally, these isoforms are all subject to several transcriptional, post-transcriptional, and post-translational modifications, all of which affect the protein's stability and/or function. In this review, we summarize recent knowledge on the distinct GR isoforms and the processes that generate them. We also review the importance of all known transcriptional, post-transcriptional, and post-translational modifications, including the regulation of GR by microRNAs. Moreover, we discuss the crucial role of the putative GR-bound DNA sequence as an allosteric ligand influencing GR structure and activity. Finally, we describe how the differential composition and distinct regulation at multiple levels of different GR species could account for the wide and diverse effects of glucocorticoids.
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Affiliation(s)
- Sofie Vandevyver
- Inflammation Research Center (S.V., L.D., C.L.), Flanders Institute for Biotechnology, B9052 Ghent, Belgium; and Department of Biomedical Molecular Biology (S.V., L.D., C.L.), Ghent University, B9052 Ghent, Belgium
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34
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Stechschulte LA, Hinds TD, Ghanem SS, Shou W, Najjar SM, Sanchez ER. FKBP51 reciprocally regulates GRα and PPARγ activation via the Akt-p38 pathway. Mol Endocrinol 2014; 28:1254-64. [PMID: 24933248 DOI: 10.1210/me.2014-1023] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
FK506-binding protein 51 (FKBP51) is a negative regulator of glucocorticoid receptor-α (GRα), although the mechanism is unknown. We show here that FKBP51 is also a chaperone to peroxisome proliferator-activated receptor-γ (PPARγ), which is essential for activity, and uncover the mechanism underlying this differential regulation. In COS-7 cells, FKBP51 overexpression reduced GRα activity at a glucocorticoid response element-luciferase reporter, while increasing PPARγ activity at a peroxisome proliferator response element reporter. Conversely, FKBP51-deficient (knockout) (51KO) mouse embryonic fibroblasts (MEFs) showed elevated GRα but reduced PPARγ activities compared with those in wild-type MEFs. Phosphorylation is known to exert a similar pattern of reciprocal modulation of GRα and PPARγ. Knockdown of FKBP51 in 3T3-L1 preadipocytes increased phosphorylation of PPARγ at serine 112, a phospho-residue that inhibits activity. In 51KO cells, elevated phosphorylation of GRα at serines 220 and 234, phospho-residues that promote activity, was observed. Because FKBP51 is an essential chaperone to the Akt-specific phosphatase PH domain leucine-rich repeat protein phosphatase, Akt signaling was investigated. Elevated Akt activation and increased activation of p38 kinase, a downstream target of Akt that phosphorylates GRα and PPARγ, were seen in 51KO MEFs, causing activation and inhibition, respectively. Inactivation of p38 with PD169316 reversed the effects of FKBP51 deficiency on GRα and PPARγ activities and reduced PPARγ phosphorylation. Last, loss of FKBP51 caused a shift of PPARγ from cytoplasm to nucleus, as previously shown for GRα. A model is proposed in which FKBP51 loss reciprocally regulates GRα and PPARγ via 2 complementary mechanisms: activation of Akt-p38-mediated phosphorylation and redistribution of the receptors to the nucleus for direct targeting by p38.
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Affiliation(s)
- Lance A Stechschulte
- Center for Diabetes and Endocrine Research (L.A.S., T.D.H., S.S.G., S.M.N., E.R.S.), Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, Ohio 43614; and Herman B. Wells Center for Pediatric Research (W.S.), Section of Pediatric Cardiology, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana 46202
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35
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Scherer J, Rainsford KD, Kean CA, Kean WF. Pharmacology of intra-articular triamcinolone. Inflammopharmacology 2014; 22:201-17. [DOI: 10.1007/s10787-014-0205-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 04/15/2014] [Indexed: 12/16/2022]
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36
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Sanchez-Laorden B, Viros A, Girotti MR, Pedersen M, Saturno G, Zambon A, Niculescu-Duvaz D, Turajlic S, Hayes A, Gore M, Larkin J, Lorigan P, Cook M, Springer C, Marais R. BRAF inhibitors induce metastasis in RAS mutant or inhibitor-resistant melanoma cells by reactivating MEK and ERK signaling. Sci Signal 2014; 7:ra30. [PMID: 24667377 DOI: 10.1126/scisignal.2004815] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Melanoma is a highly metastatic and lethal form of skin cancer. The protein kinase BRAF is mutated in about 40% of melanomas, and BRAF inhibitors improve progression-free and overall survival in these patients. However, after a relatively short period of disease control, most patients develop resistance because of reactivation of the RAF-ERK (extracellular signal-regulated kinase) pathway, mediated in many cases by mutations in RAS. We found that BRAF inhibition induces invasion and metastasis in RAS mutant melanoma cells through a mechanism mediated by the reactivation of the MEK (mitogen-activated protein kinase kinase)-ERK pathway, increased expression and secretion of interleukin 8, and induction of protease-dependent invasion. These events were accompanied by a cell morphology switch from predominantly rounded to predominantly elongated cells. We also observed similar responses in BRAF inhibitor-resistant melanoma cells. These data show that BRAF inhibitors can induce melanoma cell invasion and metastasis in tumors that develop resistance to these drugs.
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Affiliation(s)
- Berta Sanchez-Laorden
- 1Molecular Oncology Group, Cancer Research UK Manchester Institute, The University of Manchester, Manchester M20 4BX, UK
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Jain A, Wordinger RJ, Yorio T, Clark AF. Role of the alternatively spliced glucocorticoid receptor isoform GRβ in steroid responsiveness and glaucoma. J Ocul Pharmacol Ther 2014; 30:121-7. [PMID: 24506296 DOI: 10.1089/jop.2013.0239] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Glucocorticoid (GC)-induced ocular hypertension (OHT) is a serious side effect of GC therapy in susceptible individuals. This OHT is due to increased aqueous humor (AH) outflow resistance in the trabecular meshwork (TM) caused by GC-mediated changes in TM structure and function. GCs may also play a role in the development of primary open-angle glaucoma (POAG). Elevated cortisol levels in the AH or enhanced GC sensitivity may be one of the reasons for elevated intraocular pressure in POAG patients. The GC OHT responder population is at greater risk of developing POAG compared with non-responders. We recently have gained insight into the molecular mechanisms responsible for this differential GC responsiveness, which is attributed to differences in GC receptor isoform expression in the TM. This article summarizes current knowledge on alternative GC receptor splicing to generate GC receptor alpha (GRα) and GRβ and their roles in the regulation of GC responsiveness in normal and glaucoma TM.
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Affiliation(s)
- Ankur Jain
- 1 Department of Cell Biology and Immunology, University of North Texas Health Science Center , Fort Worth, Texas
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Simic I, Adzic M, Maric N, Savic D, Djordjevic J, Mihaljevic M, Mitic M, Pavlovic Z, Soldatovic I, Krstic-Demonacos M, Jasovic-Gasic M, Radojcic M. A preliminary evaluation of leukocyte phospho-glucocorticoid receptor as a potential biomarker of depressogenic vulnerability in healthy adults. Psychiatry Res 2013; 209:658-64. [PMID: 23477901 DOI: 10.1016/j.psychres.2013.02.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 01/31/2013] [Accepted: 02/02/2013] [Indexed: 01/01/2023]
Abstract
The mechanism of maladaptive chronic stress response involves altered phosphorylation of the glucocorticoid receptor (GR). In this study, we investigated if important depressogenic vulnerability factors, such as neuroticism and self-reports of negative affective states, may be associated with alterations in levels of the GR and GR phosphoisoforms in peripheral blood mononuclear cells (PBMC) of healthy adults. In 21 women and 16 men we evaluated PMBC levels of total GR (tGR), GR phosphorylated at serine 211 (pGR-S211) and serine 226 (pGR-S226) and correlated these data with personality traits and current reports of stress, anxiety and depression. Also, we assessed plasma cortisol levels in all tested subjects. Our results showed that in women nuclear pGR-S226 was positively correlated with neuroticism and current reports of depression, anxiety and stress, while the ratio of nuclear pGR-S211/pGR-S226 was negatively correlated with reports of depression. None of the aforementioned correlations were significant in men. No significant relations between cortisol levels and any of GR parameters were observed. These preliminary findings highlight the value of GR phosphorylation-related research in identifying molecular biomarkers of depressogenic vulnerability, at least in women.
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Affiliation(s)
- Iva Simic
- Laboratory of Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, University of Belgrade, P.O. BOX 522 MBE090, Belgrade 11001, Serbia
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Webster Marketon JI, Corry J. Respiratory syncytial virus (RSV) suppression of glucocorticoid receptor phosphorylation does not account for repression of transactivation. FEBS Open Bio 2013; 3:305-9. [PMID: 23951552 PMCID: PMC3741917 DOI: 10.1016/j.fob.2013.07.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 06/28/2013] [Accepted: 07/15/2013] [Indexed: 10/26/2022] Open
Abstract
Respiratory syncytial virus (RSV)-induced bronchiolitis in infants, although inflammatory in nature, is not responsive to glucocorticoids. We have recently shown that RSV-infected lung epithelial cells have impaired glucocorticoid receptor (GR)-mediated transactivation. In this study, we show that the N-terminal region of GR is required for RSV repression of GR transactivation and that RSV infection of lung epithelial cells reduces ligand-dependent GR phosphorylation at serine 211 and serine 226. However, we also show that these changes in GR phosphorylation do not account for the RSV repression of GR transactivation suggesting other regions of the GR N-terminus must also be involved.
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Affiliation(s)
- Jeanette I Webster Marketon
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Internal Medicine, Wexner Medical Center at The Ohio State University, Columbus, OH 43210, United States ; Institute for Behavioral Medicine Research, Wexner Medical Center at The Ohio State University, Columbus, OH 43210, United States
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Beck IM, Clarisse D, Bougarne N, Okret S, Haegeman G, De Bosscher K. Mitogen- and stress-activated protein kinase 1 MSK1 regulates glucocorticoid response element promoter activity in a glucocorticoid concentration-dependent manner. Eur J Pharmacol 2013; 715:1-9. [PMID: 23831393 DOI: 10.1016/j.ejphar.2013.06.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 06/20/2013] [Accepted: 06/26/2013] [Indexed: 11/30/2022]
Abstract
The glucocorticoid receptor is a nuclear receptor, and can be activated by glucocorticoid ligands. Mitogen- and stress-activated protein kinase (MSK1), when activated by p38 and ERK mitogen-activated protein kinases (MAPKs), plays a major role in chromatin relaxation via phosphorylation of histone H3 S10. The glucocorticoid receptor can target MSK1 as part of its anti-inflammatory mechanism. Here, we studied the converse mechanism, i.e. the impact of MSK1 on glucocorticoid receptor-mediated transactivation. Upstream MSK1-activating kinases concentration-dependently enhanced glucocorticoid response element (GRE)-regulated promoter activity. Correspondingly, MSK1 inhibition, via H89, or combined p38 and ERK MAPK inhibition, via SB203580 and U0126, diminished maximally stimulated GRE-regulated promoter activity using high concentrations of glucocorticoids. Concomitantly, the combination of these agents does not seem to alter site-specific phosphorylations of murine glucocorticoid receptor S212 or S220. Paradoxically, we reveal that a sub-maximally activated GRE-mediated promoter activity, by using lower concentrations of glucocorticoids, is consistently enhanced by H89 or a combination of SB203580 and U0126, irrespective of the GRE promoter context. Furthermore, we show that the glucocorticoid-induced nucleocytoplasmic translocation of MSK1 occurs in a glucocorticoid concentration-dependent manner. The observed glucocorticoid concentration-dependent effect of MSK1 or MAPK inhibition on glucocorticoid receptor transactivation warrants further research into the applicability of combined glucocorticoid and kinase inhibitor strategies for anti-inflammatory purposes.
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Affiliation(s)
- Ilse M Beck
- Laboratory of Experimental Cancer Research, Department of Radiation Therapy & Experimental Cancer Research, Ghent University, UZ 1P7, De Pintelaan 185, B-9000 Gent, Belgium.
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Plumb J, Robinson L, Lea S, Banyard A, Blaikley J, Ray D, Bizzi A, Volpi G, Facchinetti F, Singh D. Evaluation of glucocorticoid receptor function in COPD lung macrophages using beclomethasone-17-monopropionate. PLoS One 2013; 8:e64257. [PMID: 23704983 PMCID: PMC3660317 DOI: 10.1371/journal.pone.0064257] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Accepted: 04/12/2013] [Indexed: 12/11/2022] Open
Abstract
Previous studies of glucocorticoid receptor (GR) function in COPD lung macrophages have used dexamethasone to evaluate inhibition of cytokine production. We have now used the clinically relevant corticosteroid beclomethasone-17-monopropionate (17-BMP) to assess GR function in COPD lung macrophages, and investigated the transactivation of glucocorticoid sensitive genes and GR phosphorylation in addition to cytokine production. Lung macrophages were purified from surgically acquired lung tissue, from patients with COPD, smokers, and non-smokers. The transactivation of glucocorticoid sensitive genes (FKBP51 and GILZ) by 17-BMP were analysed by polymerase chain reaction. 17-BMP suppression of LPS-induced TNFα, IL-6 and CXCL8 was measured by ELISA and GR phosphorylation was measured by immunohistochemistry and Western blot. 17-BMP reduced cytokine release in a concentration dependent manner, with >70% inhibition of all cytokines, and no difference between COPD patients and controls. Similarly, the transactivation of FKBP51 and GILZ, and GR phosphorylation was similar between COPD patients and controls. In this context, GR function in COPD lung macrophages is unaltered. 17-BMP effectively suppresses cytokine production in COPD lung macrophages.
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Affiliation(s)
- Jonathan Plumb
- National Institute for Health Research Translational Research Facility, Manchester Academic Health Science Centre, University Hospital of South Manchester Foundation Trust, University of Manchester, Manchester, United Kingdom.
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Lee SR, Kim HK, Song IS, Youm J, Dizon LA, Jeong SH, Ko TH, Heo HJ, Ko KS, Rhee BD, Kim N, Han J. Glucocorticoids and their receptors: insights into specific roles in mitochondria. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2013; 112:44-54. [PMID: 23603102 DOI: 10.1016/j.pbiomolbio.2013.04.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 04/03/2013] [Accepted: 04/08/2013] [Indexed: 12/27/2022]
Abstract
Glucocorticoids (GCs) affect most physiological systems and are the most frequently used drugs for multiple disorders and organ transplantation. GC functions depend on a balance between circulating GC and cytoplasmic glucocorticoid receptor II (GR). Mitochondria individually enclose circular, double-stranded DNA that is expressed and replicated in response to nuclear-encoded factors imported from the cytoplasm. Fine-tuning and response to cellular demands should be coordinately regulated by the nucleus and mitochondria; thus mitochondrial-nuclear interaction is vital to optimal mitochondrial function. Elucidation of the direct and indirect effects of steroids, including GCs, on mitochondria is an important and emerging field of research. Mitochondria may also be under GC control because GRs are present in mitochondria, and glucocorticoid response elements (GREs) reside in the mitochondrial genome. Therefore, mitochondrial gene expression can be regulated by GCs via at least two different mechanisms: direct action on mitochondrial DNA and oxidative phosphorylation (OXPHOS) genes, or by an indirect effect through interaction with nuclear genes. In this review, we outline possible mechanisms of regulation of mitochondrial genes in response to GCs in view of translocation of the GR into mitochondria and the possible regulation of OXPHOS genes by GREs in the mitochondrial genome.
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Affiliation(s)
- Sung-Ryul Lee
- National Research Laboratory for Mitochondrial Signaling, Department of Physiology, College of Medicine, Cardiovascular and Metabolic Disease Center, Inje University, 633-165 Gaegeum-Dong, Busanjin-Gu, 613-735 Busan, Republic of Korea
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Hu A, Josephson MB, Diener BL, Nino G, Xu S, Paranjape C, Orange JS, Grunstein MM. Pro-asthmatic cytokines regulate unliganded and ligand-dependent glucocorticoid receptor signaling in airway smooth muscle. PLoS One 2013; 8:e60452. [PMID: 23593222 PMCID: PMC3617099 DOI: 10.1371/journal.pone.0060452] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 02/26/2013] [Indexed: 01/13/2023] Open
Abstract
To elucidate the regulation of glucocorticoid receptor (GR) signaling under pro-asthmatic conditions, cultured human airway smooth muscle (HASM) cells were treated with proinflammatory cytokines or GR ligands alone and in combination, and then examined for induced changes in ligand-dependent and -independent GR activation and downstream signaling events. Ligand stimulation with either cortisone or dexamethsone (DEX) acutely elicited GR translocation to the nucleus and, comparably, ligand-independent stimulation either with the Th2 cytokine, IL-13, or the pleiotropic cytokine combination, IL-1β/TNFα, also acutely evoked GR translocation. The latter response was potentiated by combined exposure of cells to GR ligand and cytokine. Similarly, treatment with either DEX or IL-13 alone induced GR phosphorylation at its serine-211 residue (GRSer211), denoting its activated state, and combined treatment with DEX+IL-13 elicited heightened and sustained GRSer211 phosphorylation. Interestingly, the above ligand-independent GR responses to IL-13 alone were not associated with downstream GR binding to its consensus DNA sequence or GR transactivation, whereas both DEX-induced GR:DNA binding and transcriptional activity were significantly heightened in the presence of IL-13, coupled to increased recruitment of the transcriptional co-factor, MED14. The stimulated GR signaling responses to DEX were prevented in IL-13-exposed cells wherein GRSer211 phosphorylation was suppressed either by transfection with specific serine phosphorylation-deficient mutant GRs or treatment with inhibitors of the MAPKs, ERK1/2 and JNK. Collectively, these novel data highlight a heretofore-unidentified homeostatic mechanism in HASM cells that involves pro-asthmatic cytokine-driven, MAPK-mediated, non-ligand-dependent GR activation that confers heightened glucocorticoid ligand-stimulated GR signaling. These findings raise the consideration that perturbations in this homeostatic cytokine-driven GR signaling mechanism may be responsible, at least in part, for the insensirtivity to glucocorticoid therapy that is commonly seen in individuals with severe asthma.
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Affiliation(s)
- Aihua Hu
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Maureen B. Josephson
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Barry L. Diener
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Gustavo Nino
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Integrative Systems Biology and Division of Pulmonary & Sleep Medicine, Children's National Medical Center, Center for Genetic Medicine Research, George Washington University, Washington, D.C., United States of America
| | - Shuyun Xu
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Chinmay Paranjape
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Jordan S. Orange
- Section of Immunology, Allergy and Rheumatology, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas, United States of America
| | - Michael M. Grunstein
- Division of Pulmonary Medicine, Children's Hospital of Philadelphia Research Institute, University of Pennsylvania Perlman School of Medicine, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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Guidotti G, Calabrese F, Anacker C, Racagni G, Pariante CM, Riva MA. Glucocorticoid receptor and FKBP5 expression is altered following exposure to chronic stress: modulation by antidepressant treatment. Neuropsychopharmacology 2013; 38:616-27. [PMID: 23169346 PMCID: PMC3572458 DOI: 10.1038/npp.2012.225] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 09/17/2012] [Accepted: 10/10/2012] [Indexed: 12/23/2022]
Abstract
Major depression is thought to originate from the interaction between susceptibility genes and adverse environmental events, in particular stress. The hypothalamus-pituitary-adrenal (HPA) axis is the major system involved in stress response and its dysregulation is an important element in the pathogenesis of depression. The stress response is therefore finely tuned through a series of mechanisms that control the trafficking of glucocorticoid receptors (GRs) to the nucleus, including binding to the chaperone protein FKBP5 and receptor phosphorylation, suggesting that these elements may also be affected under pathologic conditions. On these bases, we investigated FKBP5 and GR expression and phosphorylation in the hippocampus (ventral and dorsal) and in the prefrontal cortex of rats exposed to chronic mild stress (CMS) and we analyzed the effect of a concomitant antidepressant treatment. We found that animals exposed to CMS show increased expression of FKBP5 as well as enhanced cytoplasmic levels of GR, primarily in ventral hippocampus and prefrontal cortex. Chronic treatment with the antidepressant duloxetine is able to normalize such alterations, mainly in the prefrontal cortex. Moreover, we demonstrate that CMS-induced alterations of GR trafficking and transcription may be sustained by changes in receptor phosphorylation, which are also modulated by pharmacological intervention. In summary, while GR-related changes after CMS might be relevant for the depressive phenotype, the ability of antidepressant treatment to correct some of these alterations may contribute to the normalization of HPA axis dysfunctions associated with stress-related disorders.
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Affiliation(s)
- Gianluigi Guidotti
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Centro di Neurofarmacologia, Università degli Studi di Milano, Milan, Italy
| | - Francesca Calabrese
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Centro di Neurofarmacologia, Università degli Studi di Milano, Milan, Italy
| | - Christoph Anacker
- Section of Perinatal Psychiatry and Stress, Psychiatry and Immunology (SPI-lab), Department of Psychological Medicine, King's College London, Institute of Psychiatry, London, UK
| | - Giorgio Racagni
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Centro di Neurofarmacologia, Università degli Studi di Milano, Milan, Italy
- Center of Excellence on Neurodegenerative Diseases, Università degli Studi di Milano, Milan, Italy
| | - Carmine M Pariante
- Section of Perinatal Psychiatry and Stress, Psychiatry and Immunology (SPI-lab), Department of Psychological Medicine, King's College London, Institute of Psychiatry, London, UK
| | - Marco A Riva
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Centro di Neurofarmacologia, Università degli Studi di Milano, Milan, Italy
- Center of Excellence on Neurodegenerative Diseases, Università degli Studi di Milano, Milan, Italy
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Mitic M, Simic I, Djordjevic J, Radojcic MB, Adzic M. Gender-specific effects of fluoxetine on hippocampal glucocorticoid receptor phosphorylation and behavior in chronically stressed rats. Neuropharmacology 2013; 70:100-11. [PMID: 23353902 DOI: 10.1016/j.neuropharm.2012.12.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 12/10/2012] [Accepted: 12/22/2012] [Indexed: 12/13/2022]
Abstract
Chronic psychosocial isolation stress (CPSI) modulates glucocorticoid receptor (GR) functioning in Wistar male rat hippocampus (HIPPO) through alteration of nuclear GR phosphorylation and its upstream kinases signaling, which parallels animal depressive-like behavior. The current study investigated potential gender specificities regarding the effect of chronic therapy by an antidepressant fluoxetine (FLU) on GR signaling in HIPPO and depressive-like behavior in CPSI animals. FLU was administrated to female and male naïve or CPSI rats for 21 days and GR protein, its phosphorylation status and upstream kinases, as well as GR and BDNF mRNA were followed in HIPPO together with animal serum corticosterone (CORT) and depressive-like behavior. The results showed that CPSI increased immobility in males versus hyperactivity in females and disrupted nuclear pGR232-Cdk5 pathway and JNK signaling in a gender-specific way. In contrast, in both genders CPSI increased the nuclear levels of GR and pGR246 but decreased CORT and mRNA levels of GR and BDNF. Concomitant FLU normalized the depressive-like behavior and altered the nuclear pGR232-Cdk5 signaling in a gender-specific manner. In both females and males, FLU reversed the nuclear levels of GR and pGR246 without affecting CORT and GR mRNA levels. In contrast, FLU exhibited gender-specific effect on BDNF mRNA in CPSI animals, by increasing it in females, but not in males. In spite of normalization the total nuclear GR level upon FLU treatment in both gender, down-regulation of GR mRNA is possibly maintained through prevalence of pGR232 isoform only in males. The gender-specific alterations of pGR232-Cdk5 signaling and BDNF gene expression in HIPPO and normalization of depressive-like behavior upon FLU treatment distinguishes this signaling pathway as potential future antidepressant target for gender-specific therapy of stress related mood disorders.
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Affiliation(s)
- Milos Mitic
- Laboratory for Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, University of Belgrade, PO Box-522-MBE090, 11001 Belgrade, Serbia
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46
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Simic I, Maric NP, Mitic M, Soldatovic I, Pavlovic Z, Mihaljevic M, Andric S, Radojcic MB, Adzic M. Phosphorylation of leukocyte glucocorticoid receptor in patients with current episode of major depressive disorder. Prog Neuropsychopharmacol Biol Psychiatry 2013; 40:281-5. [PMID: 23123359 DOI: 10.1016/j.pnpbp.2012.10.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Revised: 10/11/2012] [Accepted: 10/26/2012] [Indexed: 01/01/2023]
Abstract
The impaired glucocorticoid receptor (GR) signaling has long been considered one of the cornerstones in understanding the pathophysiology of depression. Since the phosphorylation of GR is very important for GR function, in this study we investigated whether GR phosphorylation at serine 211 (pGR-S211) and serine 226 (pGR-S226) is altered in patients with current episode of major depressive disorder (MDD). Particularly, in 30 MDD patients and 35 controls we assessed the levels of nuclear total GR (tGR), pGR-S211 and pGR-S226 in peripheral blood mononuclear cells (PBMC) using Western blot technique, along with plasma cortisol concentrations from the same blood samples. Our results demonstrated increased phosphorylation of GR at S226 (p<0.001) and, to a less extent, at S211 (p<0.05) in MDD patients compared to controls. Consequently, the pGR-S211/pGR-S226 ratio was decreased (p<0.05) implying reduced transcriptional activity of GR in MDD patients. MDD subjects had higher cortisol levels than controls and cortisol concentrations were positively correlated with PBMC pGR-S226 levels from the same blood samples. There was no difference in the levels of tGR between MDD and control subjects. The study showed that altered phosphorylation of GR could contribute to impaired GR function related to the pathophysiology of depression.
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Affiliation(s)
- Iva Simic
- Laboratory of Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, University of Belgrade, P.O. Box-522-MBE090, 11001 Belgrade, Serbia
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47
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Lee MS, Park WS, Kim YH, Kwon SH, Jang YJ, Han D, Morita K, Her S. Antidepressant-like effects of Cortex Mori Radicis extract via bidirectional phosphorylation of glucocorticoid receptors in the hippocampus. Behav Brain Res 2013; 236:56-61. [DOI: 10.1016/j.bbr.2012.08.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 08/13/2012] [Accepted: 08/16/2012] [Indexed: 10/28/2022]
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48
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Lee SR, Kim HK, Youm JB, Dizon LA, Song IS, Jeong SH, Seo DY, Ko KS, Rhee BD, Kim N, Han J. Non-genomic effect of glucocorticoids on cardiovascular system. Pflugers Arch 2012; 464:549-59. [PMID: 23001133 DOI: 10.1007/s00424-012-1155-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 09/05/2012] [Indexed: 01/01/2023]
Abstract
Glucocorticoids (GCs) are essential steroid hormones for homeostasis, development, metabolism, and cognition and possess anti-inflammatory and immunosuppressive actions. Since glucocorticoid receptor II (GR) is nearly ubiquitous, chronic activation or depletion of GCs leads to dysfunction of diverse organs, including the heart and blood vessels, resulting predominantly from changes in gene expression. Most studies, therefore, have focused on the genomic effects of GC to understand its related pathophysiological manifestations. The nongenomic effects of GCs clearly differ from well-known genomic effects, with the former responding within several minutes without the need for protein synthesis. There is increasing evidence that the nongenomic actions of GCs influence various physiological functions. To develop a GC-mediated therapeutic target for the treatment of cardiovascular disease, understanding the genomic and nongenomic effects of GC on the cardiovascular system is needed. This article reviews our current understanding of the underlying mechanisms of GCs on cardiovascular diseases and stress, as well as how nongenomic GC signaling contributes to these conditions. We suggest that manipulation of GC action based on both GC and GR metabolism, mitochondrial impact, and the action of serum- and glucocorticoid-dependent kinase 1 may provide new information with which to treat cardiovascular diseases.
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Affiliation(s)
- Sung Ryul Lee
- National Research Laboratory for Mitochondrial Signaling, Department of Physiology, College of Medicine, Cardiovascular and Metabolic Disease Center, Inje University, 633-165 Gaegeum-Dong, Busanjin-Gu, Busan, Korea
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49
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Orlovsky MA. Allelic polymorphism of glucocorticoid receptor NR3C1 (GR): from molecular biology to clinical implications. ACTA ACUST UNITED AC 2012. [DOI: 10.7124/bc.000061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- M. A. Orlovsky
- O. O. Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine
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50
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Yang N, Ray DW, Matthews LC. Current concepts in glucocorticoid resistance. Steroids 2012; 77:1041-9. [PMID: 22728894 DOI: 10.1016/j.steroids.2012.05.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 05/24/2012] [Accepted: 05/29/2012] [Indexed: 01/04/2023]
Abstract
Glucocorticoids (GCs) are the most potent anti-inflammatory agents known. A major factor limiting their clinical use is the wide variation in responsiveness to therapy. The high doses of GC required for less responsive patients means a high risk of developing very serious side effects. Variation in sensitivity between individuals can be due to a number of factors. Congenital, generalized GC resistance is very rare, and is due to mutations in the glucocorticoid receptor (GR) gene, the receptor that mediates the cellular effects of GC. A more common problem is acquired GC resistance. This localized, disease-associated GC resistance is a serious therapeutic concern and limits therapeutic response in patients with chronic inflammatory disease. It is now believed that localized resistance can be attributed to changes in the cellular microenvironment, as a consequence of chronic inflammation. Multiple factors have been identified, including alterations in both GR-dependent and -independent signaling downstream of cytokine action, oxidative stress, hypoxia and serum derived factors. The underlying mechanisms are now being elucidated, and are discussed here. Attempts to augment tissue GC sensitivity are predicted to permit safe and effective use of low-dose GC therapy in inflammatory disease.
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Affiliation(s)
- Nan Yang
- Endocrine Sciences Research Group, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK
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