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Shao Y, Dong Y, Wang W, Chen Z, Hao C, Yang Y, Zhang J. The Function and Mechanism of Dopamine in the Activation of CD4 + T Cell. Immunopharmacol Immunotoxicol 2022; 44:410-420. [PMID: 35285388 DOI: 10.1080/08923973.2022.2052894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yu Shao
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, People’s Republic of China.
| | - Yongli Dong
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, People’s Republic of China.
| | - Wenwen Wang
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, People’s Republic of China.
| | - Zhengrong Chen
- Department of Respiratory Medicine, Children's Hospital of Soochow University, Suzhou, People’s Republic of China
| | - Chuangli Hao
- Department of Respiratory Medicine, Children's Hospital of Soochow University, Suzhou, People’s Republic of China
| | - Yi Yang
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, People’s Republic of China.
| | - Jinping Zhang
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, People’s Republic of China.
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Shioda N, Yabuki Y, Wang Y, Uchigashima M, Hikida T, Sasaoka T, Mori H, Watanabe M, Sasahara M, Fukunaga K. Endocytosis following dopamine D 2 receptor activation is critical for neuronal activity and dendritic spine formation via Rabex-5/PDGFRβ signaling in striatopallidal medium spiny neurons. Mol Psychiatry 2017; 22:1205-1222. [PMID: 27922607 DOI: 10.1038/mp.2016.200] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 09/28/2016] [Accepted: 10/04/2016] [Indexed: 02/06/2023]
Abstract
Aberrant dopamine D2 receptor (D2R) activity is associated with neuropsychiatric disorders, making those receptors targets for antipsychotic drugs. Here, we report that novel signaling through the intracellularly localized D2R long isoform (D2LR) elicits extracellular signal-regulated kinase (ERK) activation and dendritic spine formation through Rabex-5/platelet-derived growth factor receptor-β (PDGFRβ)-mediated endocytosis in mouse striatum. We found that D2LR directly binds to and activates Rabex-5, promoting early-endosome formation. Endosomes containing D2LR and PDGFRβ are then transported to the Golgi apparatus, where those complexes trigger Gαi3-mediated ERK signaling. Loss of intracellular D2LR-mediated ERK activation decreased neuronal activity and dendritic spine density in striatopallidal medium spiny neurons (MSNs). In addition, dendritic spine density in striatopallidal MSNs significantly increased following treatment of striatal slices from wild-type mice with quinpirole, a D2R agonist, but those changes were lacking in D2LR knockout mice. Moreover, intracellular D2LR signaling mediated effects of a typical antipsychotic drug, haloperidol, in inducing catalepsy behavior. Taken together, intracellular D2LR signaling through Rabex-5/PDGFRβ is critical for ERK activation, dendritic spine formation and neuronal activity in striatopallidal MSNs of mice.
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Affiliation(s)
- N Shioda
- Department of Biofunctional Analysis Laboratory of Molecular Biology, Gifu Pharmaceutical University, Gifu, Japan
| | - Y Yabuki
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Y Wang
- Department of Pharmacology, Beckman Institute, University of Illinois, Urbana, IL, USA
| | - M Uchigashima
- Department of Anatomy, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - T Hikida
- Department of Research and Drug Discovery, Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Sasaoka
- Department of Comparative and Experimental Medicine, Brain Research Institute, Niigata University, Niigata, Japan
| | - H Mori
- Department of Molecular Neuroscience, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - M Watanabe
- Department of Anatomy, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - M Sasahara
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Toyama, Japan
| | - K Fukunaga
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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A20 in Multiple Sclerosis and Parkinson’s Disease: Clue to a Common Dysregulation of Anti-Inflammatory Pathways? Neurotox Res 2017; 32:1-7. [DOI: 10.1007/s12640-017-9724-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Revised: 03/02/2017] [Accepted: 03/08/2017] [Indexed: 01/29/2023]
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Pollard HB, Shivakumar C, Starr J, Eidelman O, Jacobowitz DM, Dalgard CL, Srivastava M, Wilkerson MD, Stein MB, Ursano RJ. "Soldier's Heart": A Genetic Basis for Elevated Cardiovascular Disease Risk Associated with Post-traumatic Stress Disorder. Front Mol Neurosci 2016; 9:87. [PMID: 27721742 PMCID: PMC5033971 DOI: 10.3389/fnmol.2016.00087] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 09/05/2016] [Indexed: 11/13/2022] Open
Abstract
"Soldier's Heart," is an American Civil War term linking post-traumatic stress disorder (PTSD) with increased propensity for cardiovascular disease (CVD). We have hypothesized that there might be a quantifiable genetic basis for this linkage. To test this hypothesis we identified a comprehensive set of candidate risk genes for PTSD, and tested whether any were also independent risk genes for CVD. A functional analysis algorithm was used to identify associated signaling networks. We identified 106 PTSD studies that report one or more polymorphic variants in 87 candidate genes in 83,463 subjects and controls. The top upstream drivers for these PTSD risk genes are predicted to be the glucocorticoid receptor (NR3C1) and Tumor Necrosis Factor alpha (TNFA). We find that 37 of the PTSD candidate risk genes are also candidate independent risk genes for CVD. The association between PTSD and CVD is significant by Fisher's Exact Test (P = 3 × 10-54). We also find 15 PTSD risk genes that are independently associated with Type 2 Diabetes Mellitus (T2DM; also significant by Fisher's Exact Test (P = 1.8 × 10-16). Our findings offer quantitative evidence for a genetic link between post-traumatic stress and cardiovascular disease, Computationally, the common mechanism for this linkage between PTSD and CVD is innate immunity and NFκB-mediated inflammation.
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Affiliation(s)
- Harvey B. Pollard
- Department of Anatomy, Physiology and Genetics, Uniformed Services University School of Medicine, Uniformed Services University of the Health SciencesBethesda, MD, USA
- Collaborative Health Initiative Research Program, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Chittari Shivakumar
- Collaborative Health Initiative Research Program, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Joshua Starr
- Department of Anatomy, Physiology and Genetics, Uniformed Services University School of Medicine, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Ofer Eidelman
- Department of Anatomy, Physiology and Genetics, Uniformed Services University School of Medicine, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - David M. Jacobowitz
- Collaborative Health Initiative Research Program, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Clifton L. Dalgard
- Department of Anatomy, Physiology and Genetics, Uniformed Services University School of Medicine, Uniformed Services University of the Health SciencesBethesda, MD, USA
- Collaborative Health Initiative Research Program, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Meera Srivastava
- Department of Anatomy, Physiology and Genetics, Uniformed Services University School of Medicine, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Matthew D. Wilkerson
- Collaborative Health Initiative Research Program, Uniformed Services University of the Health SciencesBethesda, MD, USA
| | - Murray B. Stein
- Department of Psychiatry, University of California, San DiegoSan Diego, CA, USA
| | - Robert J. Ursano
- Department of Psychiatry Uniformed Services University School of Medicine, Uniformed Services University of the Health SciencesBethesda, MD, USA
- Center for the Study of Traumatic stress, Uniformed Services University of the Health SciencesBethesda, MD, USA
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Zhang B, Shimada Y, Kuroyanagi J, Umemoto N, Nishimura Y, Tanaka T. Quantitative phenotyping-based in vivo chemical screening in a zebrafish model of leukemia stem cell xenotransplantation. PLoS One 2014; 9:e85439. [PMID: 24454867 PMCID: PMC3893211 DOI: 10.1371/journal.pone.0085439] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 11/27/2013] [Indexed: 12/21/2022] Open
Abstract
Zebrafish-based chemical screening has recently emerged as a rapid and efficient method to identify important compounds that modulate specific biological processes and to test the therapeutic efficacy in disease models, including cancer. In leukemia, the ablation of leukemia stem cells (LSCs) is necessary to permanently eradicate the leukemia cell population. However, because of the very small number of LSCs in leukemia cell populations, their use in xenotransplantation studies (in vivo) and the difficulties in functionally and pathophysiologically replicating clinical conditions in cell culture experiments (in vitro), the progress of drug discovery for LSC inhibitors has been painfully slow. In this study, we developed a novel phenotype-based in vivo screening method using LSCs xenotransplanted into zebrafish. Aldehyde dehydrogenase-positive (ALDH+) cells were purified from chronic myelogenous leukemia K562 cells tagged with a fluorescent protein (Kusabira-orange) and then implanted in young zebrafish at 48 hours post-fertilization. Twenty-four hours after transplantation, the animals were treated with one of eight different therapeutic agents (imatinib, dasatinib, parthenolide, TDZD-8, arsenic trioxide, niclosamide, salinomycin, and thioridazine). Cancer cell proliferation, and cell migration were determined by high-content imaging. Of the eight compounds that were tested, all except imatinib and dasatinib selectively inhibited ALDH+ cell proliferation in zebrafish. In addition, these anti-LSC agents suppressed tumor cell migration in LSC-xenotransplants. Our approach offers a simple, rapid, and reliable in vivo screening system that facilitates the phenotype-driven discovery of drugs effective in suppressing LSCs.
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Affiliation(s)
- Beibei Zhang
- Department of Molecular and Cellular Pharmacology, Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
| | - Yasuhito Shimada
- Department of Molecular and Cellular Pharmacology, Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
- Mie University Medical Zebrafish Research Center, Edobashi, Tsu, Mie, Japan
- Department of Bioinformatics, Mie University Life Science Research Center, Edobashi, Tsu, Mie, Japan
- Department of Omics Medicine, Mie University Industrial Technology Innovation, Edobashi, Tsu, Mie, Japan
- Department of Systems Pharmacology, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
| | - Junya Kuroyanagi
- Department of Molecular and Cellular Pharmacology, Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
| | - Noriko Umemoto
- Department of Molecular and Cellular Pharmacology, Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
- Department of Systems Pharmacology, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
| | - Yuhei Nishimura
- Department of Molecular and Cellular Pharmacology, Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
- Mie University Medical Zebrafish Research Center, Edobashi, Tsu, Mie, Japan
- Department of Bioinformatics, Mie University Life Science Research Center, Edobashi, Tsu, Mie, Japan
- Department of Omics Medicine, Mie University Industrial Technology Innovation, Edobashi, Tsu, Mie, Japan
- Department of Systems Pharmacology, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
| | - Toshio Tanaka
- Department of Molecular and Cellular Pharmacology, Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
- Mie University Medical Zebrafish Research Center, Edobashi, Tsu, Mie, Japan
- Department of Bioinformatics, Mie University Life Science Research Center, Edobashi, Tsu, Mie, Japan
- Department of Omics Medicine, Mie University Industrial Technology Innovation, Edobashi, Tsu, Mie, Japan
- Department of Systems Pharmacology, Mie University Graduate School of Medicine, Edobashi, Tsu, Mie, Japan
- * E-mail:
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Lyons MR, West AE. Mechanisms of specificity in neuronal activity-regulated gene transcription. Prog Neurobiol 2011; 94:259-95. [PMID: 21620929 PMCID: PMC3134613 DOI: 10.1016/j.pneurobio.2011.05.003] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 05/05/2011] [Accepted: 05/05/2011] [Indexed: 02/06/2023]
Abstract
The brain is a highly adaptable organ that is capable of converting sensory information into changes in neuronal function. This plasticity allows behavior to be accommodated to the environment, providing an important evolutionary advantage. Neurons convert environmental stimuli into long-lasting changes in their physiology in part through the synaptic activity-regulated transcription of new gene products. Since the neurotransmitter-dependent regulation of Fos transcription was first discovered nearly 25 years ago, a wealth of studies have enriched our understanding of the molecular pathways that mediate activity-regulated changes in gene transcription. These findings show that a broad range of signaling pathways and transcriptional regulators can be engaged by neuronal activity to sculpt complex programs of stimulus-regulated gene transcription. However, the shear scope of the transcriptional pathways engaged by neuronal activity raises the question of how specificity in the nature of the transcriptional response is achieved in order to encode physiologically relevant responses to divergent stimuli. Here we summarize the general paradigms by which neuronal activity regulates transcription while focusing on the molecular mechanisms that confer differential stimulus-, cell-type-, and developmental-specificity upon activity-regulated programs of neuronal gene transcription. In addition, we preview some of the new technologies that will advance our future understanding of the mechanisms and consequences of activity-regulated gene transcription in the brain.
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Affiliation(s)
- Michelle R Lyons
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
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Bontempi S, Fiorentini C, Busi C, Guerra N, Spano P, Missale C. Identification and characterization of two nuclear factor-kappaB sites in the regulatory region of the dopamine D2 receptor. Endocrinology 2007; 148:2563-70. [PMID: 17317773 DOI: 10.1210/en.2006-1618] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Regulation of D2 receptor (D2R) expression is crucial in the function of dopaminergic systems. Because alterations of D2R expression may contribute to the development of different disorders, it is important to elucidate the mechanisms regulating D2R gene transcription. We report the characterization of two putative nuclear factor-kappaB (NF-kappaB) motifs, referred to as D2-kappaB sites, in the human D2R promoter, and demonstrate that they bind NF-kappaB subunits and stimulate D2R promoter activity. D2-kappaB sites show different degrees of conservation and specificity, when compared with canonical kB sites. The D2-kappaB1 site (from -407 to -398) is highly conserved and binds p50/p65 and p50/c-Rel complexes, whereas D2-kappaB2 (from -513 to -504) is more degenerated and only binds p50/p65 heterodimers. Activation of D2-kappaB sites in COS-7 cells expressing a luciferase reporter vector containing the D2R promoter resulted in increased transcriptional activity. Site-directed mutagenesis of each D2-kappaB site differentially modified D2R promoter activity. In particular, mutation of the D2-kappaB1 motif did not affect D2R promoter response to p50/c-Rel complexes, whereas inactivation of the D2-kappaB2 site decreased it. Mutations of either D2-kappaB1 or D2-kappaB2 sites attenuated the D2R promoter transcriptional efficiency induced by p50/p65 complexes. Thus, D2R transcription mediated by p50/c-Rel is supported mainly by the D2-kappaB2 site, whereas both sites are necessary to support the full transcriptional activity mediated by p50/p65 complexes. A correlation was found between NF-kappaB activity and D2R expression in the pituitary and pituitary-derived cells but not in the striatum, suggesting that NF-kappaB regulation of D2R expression could be a pituitary-specific mechanism.
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Affiliation(s)
- Sandra Bontempi
- Division of Pharmacology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, Viale Europa 11, 25124 Brescia, Italy
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Pizzi M, Spano P. Distinct roles of diverse nuclear factor-kappaB complexes in neuropathological mechanisms. Eur J Pharmacol 2006; 545:22-8. [PMID: 16854410 DOI: 10.1016/j.ejphar.2006.06.027] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Revised: 03/22/2006] [Accepted: 06/13/2006] [Indexed: 12/18/2022]
Abstract
The nuclear transcription factors kappaB (NF-kappaB) function as key regulators of physiological processes in the central nervous system. Aberrant regulation of NF-kappaB can underlie neurological disorders associated with neurodegeneration. A large number of studies have reported a dual role of NF-kappaB in regulating neuron survival in pathological conditions. A recent progress in understanding the mechanisms responsible for opposite effects elicited by NF-kappaB in brain dysfunctions arises from the identification of diverse NF-kappaB complexes specifically involved in the mechanism of neuronal cell death or cell survival. We here discuss the latest findings and consider the therapeutic potential of targeting distinct NF-kappaB complexes for the treatment of neurodegenerative disorders and memory dysfunctions.
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Affiliation(s)
- Marina Pizzi
- Division of Pharmacology and Experimental Therapeutics, Department of Biomedical Sciences and Biotechnologies, School of Medicine, University of Brescia, I 25123, Italy.
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Abstract
Members of the nuclear factor kappaB (NF-kappaB) family of transcription factors are activated within the CNS in pathological settings of apoptosis and neurological disease. Recent work using several model systems provides accumulating evidence that these transcription factors also participate in the regulation of neuronal activity-dependent transcription and behavior under physiological conditions. This review highlights advances in our understanding of the mechanisms of Ca(2+)-responsive activation and synaptic signaling to the nucleus by NF-kappaB transcription factors within the CNS, and the relevance of this transcription factor family for learning and memory.
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Affiliation(s)
- Mollie K Meffert
- Division of Biology, MC204-31 California Institute of Technology, Pasadena, CA 91125, USA.
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Browning JL, Patel T, Brandt PC, Young KA, Holcomb LA, Hicks PB. Clozapine and the mitogen-activated protein kinase signal transduction pathway: implications for antipsychotic actions. Biol Psychiatry 2005; 57:617-23. [PMID: 15780848 DOI: 10.1016/j.biopsych.2004.12.002] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2004] [Revised: 11/02/2004] [Accepted: 12/01/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND Mitogen-activated protein kinase (MAPK) signaling pathways respond to dopaminergic and serotonergic agents and mediate short- and long-term effects of intracellular signaling in neurons. Here we show that the antipsychotic agent, clozapine, selectively activates the MEK/ERK MAPK pathway, and inhibition of this pathway reverses clozapine's actions in the conditioned avoidance response (CAR) paradigm, a rodent behavioral assay of antipsychotic activity. METHODS Phosphorylation patterns of MAPK pathway enzymes were determined by quantitative immunoblot analysis and immunohistochemistry of rat prefrontal cortex. Kinase inhibitors were used to assess the role of MAPK signaling pathways in mediating clozapine-induced suppression of CAR. RESULTS Clozapine administration selectively increased phosphorylation of MEK1/2 but had no effect on p38 or JNK phosphorylation. Pretreatment with the 5-HT2A agonist (+/-)-2,5-dimethoxy-4-iodoamphetamine hydrochloride blocked the clozapine-induced increase in MEK1/2 phosphorylation. Immunohistochemistry revealed that clozapine treatment elevated the number of cells in the prefrontal cortex positive for phosphoERK, the downstream substrate of MEK1/2. Prior administration of MEK1/2 inhibitors U0126 or Sl327, or ERK inhibitor 5-iodotubercidin, reversed suppression of CAR induced by clozapine, whereas administration of vehicle, JNK or p38 inhibitors (L-JNK-1 and SB203580, respectively) had no effect. Inhibition of kinases upstream to MEK1/2 (PI-3K, PKC, and CaMKII) by administration of LY294002, bisindolylmaleimide, or KN-62, respectively, also reversed clozapine-induced suppression of CAR. CONCLUSIONS These data support the hypothesis that the MEK/ERK signal transduction cascade participates in clozapine's antipsychotic actions.
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Affiliation(s)
- Jeff L Browning
- Department of Psychiatry, Scott & White Memorial Hospital, Central Texas Veterans Health Care System, and Texas A & M University System Health Science Center College of Medicine, Temple, Texas, USA.
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Takeuchi Y, Fukunaga K. Dopamine D2 receptor activates extracellular signal-regulated kinase through the specific region in the third cytoplasmic loop. J Neurochem 2004; 89:1498-507. [PMID: 15189353 DOI: 10.1111/j.1471-4159.2004.02446.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To investigate whether the third cytoplasmic loop and the C-terminal cytoplasmic tail of dopamine D(2) receptor (D2R) are involved in extracellular signal-regulated kinase (ERK) activation and subsequent regulation of transcription factors, we established NG108-15 cells stably expressing D2LR and D2SR deleted 40 amino acid residues in the third cytoplasmic loop (NGD2LR-3rd-dele and NGD2SR-3rd-dele) or the C-terminal cytoplasmic tail (NGD2LR-C-dele and NGD2SR-C-dele) and evaluated these receptors' functions using luciferase reporter gene assay. Immunocytochemical studies showed similar intracellular distributions of D2LR-3rd-dele and D2SR-3rd-dele to D2LR and D2SR, respectively. Quinpirole-induced inhibition of forskolin-induced cyclic AMP responsive element (CRE) activation was not affected by the deletion of 40 amino acid residues. However, nuclear factor-kappa B (NF-kappaB) activation by D2R-3rd-dele was largely attenuated compared to that by D2R. Similarly, ERK or serum-responsive element (SRE) activation by quinpirole treatment was totally abolished in NGD2R-3rd-dele cells. Moreover, D2R-C-dele was diffusely distributed or clustered in the cell bodies and lost the receptor functions. Taken together, the 40 amino acid residues in the third cytoplasmic loop are essential for the ERK activation but not for inhibition of adenylyl cyclase through Gi/o proteins. In addition, the C-terminal cytoplasmic tail is essential for membrane association of D2Rs to elicit the receptor functions.
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Affiliation(s)
- Yusuke Takeuchi
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8578, Japan.
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Takeuchi Y, Fukunaga K. Different activation of NF-κB by stimulation of dopamine D2L and D2S receptors through calcineurin activation. J Neurochem 2004; 90:155-63. [PMID: 15198675 DOI: 10.1111/j.1471-4159.2004.02476.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Dopamine D2 receptor (D2R) has known to activate Ca(2+)/calmodulin-dependent protein phosphatase, calcineurin by increasing in the intracellular Ca(2+). We previously showed that D2LR (long isoform) and D2SR (short isoform) enhanced SRE and NF-kappaB, and conversely suppressed CRE transcriptional activities in NG108-15 cells stably expressed with these receptors (NGD2LR and NGD2SR). In this study, to investigate whether activation of calcineurin is involved in the transcriptional regulations through D2R, we evaluated effect of cyclosporin A, a selective calcineurin inhibitor, on them in NGD2LR and NGD2SR cells using luciferase reporter gene assay. We first confirmed that D2LR activates calcineurin in NG108-15 cells by measurement of dephosphorylation of dopamine- and cyclic AMP-regulated phosphoprotein Mr 32 000 (DARPP-32) at threonin 34 by immunoblot analysis with its phospho-specific antibody. Cyclosporin A treatment showed no change in suppression of forskolin-induced CRE activation or activation of SRE but significantly attenuated NF-kappaB activation by D2LR stimulation in NGD2LR cells. Interestingly, D2SR-induced NF-kappaB activation, which was weaker than that by D2LR stimulation, was not affected by cyclosporin A treatment in NGD2SR cells. Furthermore, D2SR stimulation did not cause dephosphorylation of DARPP-32 at threonin 34. Taken together, D2SR and D2LR may employ different signaling pathway on intracellular Ca(2+) mobilization, thereby showing different NF-kappaB activation in the calcineurin-dependent manner.
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Affiliation(s)
- Yusuke Takeuchi
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
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