1
|
Köck Z, Schnelle K, Persechino M, Umbach S, Schihada H, Januliene D, Parey K, Pockes S, Kolb P, Dötsch V, Möller A, Hilger D, Bernhard F. Cryo-EM structure of cell-free synthesized human histamine 2 receptor/G s complex in nanodisc environment. Nat Commun 2024; 15:1831. [PMID: 38418462 PMCID: PMC10901899 DOI: 10.1038/s41467-024-46096-z] [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: 07/13/2023] [Accepted: 02/14/2024] [Indexed: 03/01/2024] Open
Abstract
Here we describe the cryo-electron microscopy structure of the human histamine 2 receptor (H2R) in an active conformation with bound histamine and in complex with Gs heterotrimeric protein at an overall resolution of 3.4 Å. The complex was generated by cotranslational insertion of the receptor into preformed nanodisc membranes using cell-free synthesis in E. coli lysates. Structural comparison with the inactive conformation of H2R and the inactive and Gq-coupled active state of H1R together with structure-guided functional experiments reveal molecular insights into the specificity of ligand binding and G protein coupling for this receptor family. We demonstrate lipid-modulated folding of cell-free synthesized H2R, its agonist-dependent internalization and its interaction with endogenously synthesized H1R and H2R in HEK293 cells by applying a recently developed nanotransfer technique.
Collapse
Affiliation(s)
- Zoe Köck
- Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe-University of Frankfurt/Main, Frankfurt, Germany
| | - Kilian Schnelle
- Department of Biology/Chemistry, Structural Biology section, University of Osnabrück, Osnabrück, Germany
- Center of Cellular Nanoanalytic Osnabrück (CellNanOs), University of Osnabrück, Osnabrück, Germany
| | | | - Simon Umbach
- Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe-University of Frankfurt/Main, Frankfurt, Germany
| | - Hannes Schihada
- Department of Pharmaceutical Chemistry, University of Marburg, Marburg, Germany
| | - Dovile Januliene
- Department of Biology/Chemistry, Structural Biology section, University of Osnabrück, Osnabrück, Germany
- Center of Cellular Nanoanalytic Osnabrück (CellNanOs), University of Osnabrück, Osnabrück, Germany
| | - Kristian Parey
- Department of Biology/Chemistry, Structural Biology section, University of Osnabrück, Osnabrück, Germany
- Center of Cellular Nanoanalytic Osnabrück (CellNanOs), University of Osnabrück, Osnabrück, Germany
| | - Steffen Pockes
- Institute of Pharmacy, University of Regensburg, Regensburg, Germany
| | - Peter Kolb
- Department of Pharmaceutical Chemistry, University of Marburg, Marburg, Germany
| | - Volker Dötsch
- Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe-University of Frankfurt/Main, Frankfurt, Germany
| | - Arne Möller
- Department of Biology/Chemistry, Structural Biology section, University of Osnabrück, Osnabrück, Germany.
- Center of Cellular Nanoanalytic Osnabrück (CellNanOs), University of Osnabrück, Osnabrück, Germany.
| | - Daniel Hilger
- Department of Pharmaceutical Chemistry, University of Marburg, Marburg, Germany.
| | - Frank Bernhard
- Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe-University of Frankfurt/Main, Frankfurt, Germany.
| |
Collapse
|
2
|
Khouma A, Moeini MM, Plamondon J, Richard D, Caron A, Michael NJ. Histaminergic regulation of food intake. Front Endocrinol (Lausanne) 2023; 14:1202089. [PMID: 37448468 PMCID: PMC10338010 DOI: 10.3389/fendo.2023.1202089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 06/06/2023] [Indexed: 07/15/2023] Open
Abstract
Histamine is a biogenic amine that acts as a neuromodulator within the brain. In the hypothalamus, histaminergic signaling contributes to the regulation of numerous physiological and homeostatic processes, including the regulation of energy balance. Histaminergic neurons project extensively throughout the hypothalamus and two histamine receptors (H1R, H3R) are strongly expressed in key hypothalamic nuclei known to regulate energy homeostasis, including the paraventricular (PVH), ventromedial (VMH), dorsomedial (DMH), and arcuate (ARC) nuclei. The activation of different histamine receptors is associated with differential effects on neuronal activity, mediated by their different G protein-coupling. Consequently, activation of H1R has opposing effects on food intake to that of H3R: H1R activation suppresses food intake, while H3R activation mediates an orexigenic response. The central histaminergic system has been implicated in atypical antipsychotic-induced weight gain and has been proposed as a potential therapeutic target for the treatment of obesity. It has also been demonstrated to interact with other major regulators of energy homeostasis, including the central melanocortin system and the adipose-derived hormone leptin. However, the exact mechanisms by which the histaminergic system contributes to the modification of these satiety signals remain underexplored. The present review focuses on recent advances in our understanding of the central histaminergic system's role in regulating feeding and highlights unanswered questions remaining in our knowledge of the functionality of this system.
Collapse
Affiliation(s)
- Axelle Khouma
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, QC, Canada
- Faculté de Pharmacie, Université Laval, Québec, QC, Canada
| | - Moein Minbashi Moeini
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, QC, Canada
- Faculté de Pharmacie, Université Laval, Québec, QC, Canada
| | - Julie Plamondon
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, QC, Canada
| | - Denis Richard
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, QC, Canada
- Faculté de Medicine, Université Laval, Québec, QC, Canada
| | - Alexandre Caron
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, QC, Canada
- Faculté de Pharmacie, Université Laval, Québec, QC, Canada
- Montreal Diabetes Research Center, Montreal, QC, Canada
| | - Natalie Jane Michael
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, QC, Canada
- Faculté de Pharmacie, Université Laval, Québec, QC, Canada
| |
Collapse
|
3
|
Neumann J, Hofmann B, Kirchhefer U, Dhein S, Gergs U. Function and Role of Histamine H 1 Receptor in the Mammalian Heart. Pharmaceuticals (Basel) 2023; 16:ph16050734. [PMID: 37242517 DOI: 10.3390/ph16050734] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Histamine can change the force of cardiac contraction and alter the beating rate in mammals, including humans. However, striking species and regional differences have been observed. Depending on the species and the cardiac region (atrium versus ventricle) studied, the contractile, chronotropic, dromotropic, and bathmotropic effects of histamine vary. Histamine is present and is produced in the mammalian heart. Thus, histamine may exert autocrine or paracrine effects in the mammalian heart. Histamine uses at least four heptahelical receptors: H1, H2, H3 and H4. Depending on the species and region studied, cardiomyocytes express only histamine H1 or only histamine H2 receptors or both. These receptors are not necessarily functional concerning contractility. We have considerable knowledge of the cardiac expression and function of histamine H2 receptors. In contrast, we have a poor understanding of the cardiac role of the histamine H1 receptor. Therefore, we address the structure, signal transduction, and expressional regulation of the histamine H1 receptor with an eye on its cardiac role. We point out signal transduction and the role of the histamine H1 receptor in various animal species. This review aims to identify gaps in our knowledge of cardiac histamine H1 receptors. We highlight where the published research shows disagreements and requires a new approach. Moreover, we show that diseases alter the expression and functional effects of histamine H1 receptors in the heart. We found that antidepressive drugs and neuroleptic drugs might act as antagonists of cardiac histamine H1 receptors, and believe that histamine H1 receptors in the heart might be attractive targets for drug therapy. The authors believe that a better understanding of the role of histamine H1 receptors in the human heart might be clinically relevant for improving drug therapy.
Collapse
Affiliation(s)
- Joachim Neumann
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Magdeburger Straße 4, Martin-Luther-Universität Halle-Wittenberg, 06097 Halle, Germany
| | - Britt Hofmann
- Herzchirurgie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Ernst-Grube Straße 40, 06097 Halle, Germany
| | - Uwe Kirchhefer
- Institut für Pharmakologie und Toxikologie, Domagkstraße 12, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Stefan Dhein
- Rudolf-Boehm Institut für Pharmakologie und Toxikologie, Härtelstraße 16-18, Universität Leipzig, 04107 Leipzig, Germany
| | - Ulrich Gergs
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Magdeburger Straße 4, Martin-Luther-Universität Halle-Wittenberg, 06097 Halle, Germany
| |
Collapse
|
4
|
Shen JK, Zhang HT. Function and structure of bradykinin receptor 2 for drug discovery. Acta Pharmacol Sin 2023; 44:489-498. [PMID: 36075965 PMCID: PMC9453710 DOI: 10.1038/s41401-022-00982-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 08/11/2022] [Indexed: 11/08/2022] Open
Abstract
Type 2 bradykinin receptor (B2R) is an essential G protein-coupled receptor (GPCR) that regulates the cardiovascular system as a vasodepressor. Dysfunction of B2R is also closely related to cancers and hereditary angioedema (HAE). Although several B2R agonists and antagonists have been developed, icatibant is the only B2R antagonist clinically used for treating HAE. The recently determined structures of B2R have provided molecular insights into the functions and regulation of B2R, which shed light on structure-based drug design for the treatment of B2R-related diseases. In this review, we summarize the structure and function of B2R in relation to drug discovery and discuss future research directions to elucidate the remaining unknown functions of B2R dimerization.
Collapse
Affiliation(s)
- Jin-Kang Shen
- Hangzhou Institute of Innovative Medicine, Institute of Pharmacology and Toxicology, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Hai-Tao Zhang
- Hangzhou Institute of Innovative Medicine, Institute of Pharmacology and Toxicology, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
- The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China.
| |
Collapse
|
5
|
Gene Expression Profile Associated with Asmt Knockout-Induced Depression-Like Behaviors and Exercise Effects in Mouse Hypothalamus. Biosci Rep 2022; 42:231525. [PMID: 35771226 PMCID: PMC9284346 DOI: 10.1042/bsr20220800] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 06/16/2022] [Accepted: 06/29/2022] [Indexed: 11/17/2022] Open
Abstract
Sleep disorder caused by abnormal circadian rhythm is one of the main symptoms and risk factors of depression. As a known hormone regulating circadian rhythms, melatonin (MT) is also namely N-acetyl-5-methoxytryptamine. N-acetylserotonin methyltransferase (Asmt) is the key rate-limiting enzyme of MT synthesis and has been reportedly associated with depression. Although 50–90% of patients with depression have sleep disorders, there are no effective treatment ways in the clinic. Exercise can regulate circadian rhythm and play an important role in depression treatment. In the present study, we showed that Asmt knockout induced depression-like behaviors, which were ameliorated by swimming exercise. Moreover, swimming exercise increased serum levels of MT and 5-hydroxytryptamine (5-HT) in Asmt knockout mice. In addition, the microarray data identified 10 differentially expressed genes (DEGs) in KO mice compared with WT mice and 29 DEGs in KO mice after swimming exercise. Among the DEGs, the direction and magnitude of change in epidermal growth factor receptor pathway substrate 8-like 1 (Eps8l1) and phospholipase C-β 2 (Plcb2) were confirmed by qRT-PCR partly. Subsequent bioinformatic analysis showed that these DEGs were enriched significantly in the p53 signaling pathway, long-term depression and estrogen signaling pathway. In the protein–protein interaction (PPI) networks, membrane palmitoylated protein 1 (Mpp1) and p53-induced death domain protein 1 (Pidd1) were hub genes to participate in the pathological mechanisms of depression and exercise intervention. These findings may provide new targets for the treatment of depression.
Collapse
|
6
|
Abstract
Pertussis, also known as whooping cough, is a contagious respiratory disease caused by the Gram-negative bacterium Bordetella pertussis. This disease is characterized by severe and uncontrollable coughing, which imposes a significant burden on patients. However, its etiological agent and the mechanism are totally unknown because of a lack of versatile animal models that reproduce the cough. Here, we present a mouse model that reproduces coughing after intranasal inoculation with the bacterium or its components and demonstrate that lipooligosaccharide (LOS), pertussis toxin (PTx), and Vag8 of the bacterium cooperatively function to cause coughing. Bradykinin induced by LOS sensitized a transient receptor potential ion channel, TRPV1, which acts as a sensor to evoke the cough reflex. Vag8 further increased bradykinin levels by inhibiting the C1 esterase inhibitor, the major downregulator of the contact system, which generates bradykinin. PTx inhibits intrinsic negative regulation systems for TRPV1 through the inactivation of Gi GTPases. Our findings provide a basis to answer long-standing questions on the pathophysiology of pertussis cough.
Collapse
|
7
|
Mizuguchi H, Kitamura Y, Takeda N, Fukui H. Molecular Signaling and Transcriptional Regulation of Histamine H 1 Receptor Gene. Curr Top Behav Neurosci 2021; 59:91-110. [PMID: 34595742 DOI: 10.1007/7854_2021_256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Histamine-activated histamine H1 receptor (H1R) signaling regulates many gene expressions, mainly through the protein kinase C (PKC)/extracellular signal-regulated kinases (ERK) signaling. Involvement of other signaling, including NF-κB, Wnt, RUNX-2, and Rho A signaling was also demonstrated. In addition, cAMP production through the activation of H1R signaling was reported. H1R gene itself is also up-regulated by the activation of H1R signaling with histamine. Here, we review our recent findings in the molecular signaling and transcriptional regulation of the H1R gene. Stimulation with histamine up-regulates H1R gene expression through the activation of H1R in HeLa cells. The PKCδ/ERK/poly(ADP)ribosyl transferase-1 (PARP-1) signaling was involved in this up-regulation. Heat shock protein 90 also plays an important role in regulating PKCδ translocation. Promoter analyses revealed the existence of two promoters in the human H1R gene in HeLa cells. H1R-activated H1R gene up-regulation in response to histamine was also observed in U373 astroglioma cells. However, this up-regulation was mediated not through the PKCδ signaling but possibly through the PKCα signaling. In addition, the promoter region responsible for histamine-induced H1R gene transcription in U373 cells was different from that of HeLa cells. These findings suggest that the molecular signaling and transcriptional regulation of the H1R gene are different between neuronal cells and non-neuronal cells.
Collapse
Affiliation(s)
- Hiroyuki Mizuguchi
- Laboratory of Pharmacology, Faculty of Pharmacy, Osaka Ohtani University, Osaka, Japan.
| | - Yoshiaki Kitamura
- Department of Otolaryngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Noriaki Takeda
- Department of Otolaryngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | | |
Collapse
|
8
|
Zhou J, Azizan EAB, Cabrera CP, Fernandes-Rosa FL, Boulkroun S, Argentesi G, Cottrell E, Amar L, Wu X, O'Toole S, Goodchild E, Marker A, Senanayake R, Garg S, Åkerström T, Backman S, Jordan S, Polubothu S, Berney DM, Gluck A, Lines KE, Thakker RV, Tuthill A, Joyce C, Kaski JP, Karet Frankl FE, Metherell LA, Teo AED, Gurnell M, Parvanta L, Drake WM, Wozniak E, Klinzing D, Kuan JL, Tiang Z, Gomez Sanchez CE, Hellman P, Foo RSY, Mein CA, Kinsler VA, Björklund P, Storr HL, Zennaro MC, Brown MJ. Somatic mutations of GNA11 and GNAQ in CTNNB1-mutant aldosterone-producing adenomas presenting in puberty, pregnancy or menopause. Nat Genet 2021; 53:1360-1372. [PMID: 34385710 PMCID: PMC9082578 DOI: 10.1038/s41588-021-00906-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 06/29/2021] [Indexed: 01/05/2023]
Abstract
Most aldosterone-producing adenomas (APAs) have gain-of-function somatic mutations of ion channels or transporters. However, their frequency in aldosterone-producing cell clusters of normal adrenal gland suggests a requirement for codriver mutations in APAs. Here we identified gain-of-function mutations in both CTNNB1 and GNA11 by whole-exome sequencing of 3/41 APAs. Further sequencing of known CTNNB1-mutant APAs led to a total of 16 of 27 (59%) with a somatic p.Gln209His, p.Gln209Pro or p.Gln209Leu mutation of GNA11 or GNAQ. Solitary GNA11 mutations were found in hyperplastic zona glomerulosa adjacent to double-mutant APAs. Nine of ten patients in our UK/Irish cohort presented in puberty, pregnancy or menopause. Among multiple transcripts upregulated more than tenfold in double-mutant APAs was LHCGR, the receptor for luteinizing or pregnancy hormone (human chorionic gonadotropin). Transfections of adrenocortical cells demonstrated additive effects of GNA11 and CTNNB1 mutations on aldosterone secretion and expression of genes upregulated in double-mutant APAs. In adrenal cortex, GNA11/Q mutations appear clinically silent without a codriver mutation of CTNNB1.
Collapse
Affiliation(s)
- Junhua Zhou
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Elena A B Azizan
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK.
- Department of Medicine, The National University of Malaysia (UKM) Medical Centre, Kuala Lumpur, Malaysia.
| | - Claudia P Cabrera
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
- Centre for Translational Bioinformatics, William Harvey Research Institute, Queen Mary University of London, London, UK
| | | | | | - Giulia Argentesi
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Emily Cottrell
- Centre for Endocrinology, William Harvey Research Institute, Queen Mary University of London, London, UK
| | - Laurence Amar
- Université de Paris, PARCC, Inserm, Paris, France
- Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Unité Hypertension Artérielle, Paris, France
| | - Xilin Wu
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Sam O'Toole
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Emily Goodchild
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Alison Marker
- Department of Histopathology, Addenbrooke's Hospital, Cambridge, UK
| | - Russell Senanayake
- Metabolic Research Laboratories, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, UK
| | - Sumedha Garg
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
- Metabolic Research Laboratories, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, UK
| | - Tobias Åkerström
- Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Samuel Backman
- Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Suzanne Jordan
- Cellular Pathology Department, Royal London Hospital, London, UK
| | - Satyamaanasa Polubothu
- Genetics and Genomic Medicine, University College London Great Ormond Street Institute of Child Health, London, UK
| | - Daniel M Berney
- Centre for Cancer Biomarkers and Biotherapeutics, Barts Cancer Institute, Queen Mary University of London, London, UK
| | - Anna Gluck
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Kate E Lines
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Rajesh V Thakker
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Antoinette Tuthill
- Department of Endocrinology and Diabetes, Cork University Hospital, Cork, Ireland
| | - Caroline Joyce
- Clinical Biochemistry, Cork University Hospital, Cork, Ireland
| | - Juan Pablo Kaski
- Centre for Inherited Cardiovascular Diseases, Great Ormond Street Hospital and University College London Institute of Cardiovascular Science, London, UK
| | - Fiona E Karet Frankl
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, UK
| | - Lou A Metherell
- Centre for Endocrinology, William Harvey Research Institute, Queen Mary University of London, London, UK
| | - Ada E D Teo
- Dept of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Mark Gurnell
- Metabolic Research Laboratories, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, UK
| | - Laila Parvanta
- Department of Surgery, St Bartholomew's Hospital, London, UK
| | - William M Drake
- Department of Endocrinology, St Bartholomew's Hospital, London, UK
| | - Eva Wozniak
- Barts and London Genome Centre, School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, London, UK
| | - David Klinzing
- Cardiovascular Disease Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jyn Ling Kuan
- Cardiovascular Disease Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Zenia Tiang
- Cardiovascular Disease Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore
| | - Celso E Gomez Sanchez
- G.V. (Sonny) Montgomery VA Medical Center and Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, MS, USA
| | - Per Hellman
- Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Roger S Y Foo
- Cardiovascular Disease Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Charles A Mein
- Barts and London Genome Centre, School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, London, UK
| | | | - Peyman Björklund
- Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Helen L Storr
- Centre for Endocrinology, William Harvey Research Institute, Queen Mary University of London, London, UK
| | - Maria-Christina Zennaro
- Université de Paris, PARCC, Inserm, Paris, France.
- Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Service de Génétique, Paris, France.
| | - Morris J Brown
- Endocrine Hypertension, Department of Clinical Pharmacology, William Harvey Research Institute, Queen Mary University of London, London, UK.
- NIHR Barts Cardiovascular Biomedical Research Centre, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
| |
Collapse
|
9
|
Burghi V, Echeverría EB, Zappia CD, Díaz Nebreda A, Ripoll S, Gómez N, Shayo C, Davio CA, Monczor F, Fernández NC. Biased agonism at histamine H 1 receptor: Desensitization, internalization and MAPK activation triggered by antihistamines. Eur J Pharmacol 2021; 896:173913. [PMID: 33508282 DOI: 10.1016/j.ejphar.2021.173913] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 01/18/2021] [Accepted: 01/21/2021] [Indexed: 11/19/2022]
Abstract
Histamine H1 receptor ligands used clinically as antiallergics rank among the most widely prescribed and over-the-counter drugs in the world. They exert the therapeutic actions by blocking the effects of histamine, due to null or negative efficacy towards Gαq-phospholipase C (PLC)-inositol triphosphates (IP3)-Ca2+ and nuclear factor-kappa B cascades. However, there is no information regarding their ability to modulate other receptor responses. The aim of the present study was to investigate whether histamine H1 receptor ligands could display positive efficacy concerning receptor desensitization, internalization, signaling through Gαq independent pathways or even transcriptional regulation of proinflammatory genes. While diphenhydramine, triprolidine and chlorpheniramine activate ERK1/2 (extracellular signal-regulated kinase 1/2) pathway in A549 cells, pre-treatment with chlorpheniramine or triprolidine completely desensitize histamine H1 receptor mediated Ca2+ response, and both diphenhydramine and triprolidine lead to receptor internalization. Unlike histamine, histamine H1 receptor desensitization and internalization induced by antihistamines prove to be independent of G protein-coupled receptor kinase 2 (GRK2) phosphorylation. Also, unlike the reference agonist, the recovery of the number of cell-surface histamine H1 receptors is a consequence of de novo synthesis. On the other hand, all of the ligands lack efficacy regarding cyclooxygenase-2 (COX-2) and interleukin-8 (IL-8) mRNA regulation. However, a prolonged exposure with each of the antihistamines impaires the increase in COX-2 and IL-8 mRNA levels induced by histamine, even after ligand removal. Altogether, these findings demonstrate the biased nature of histamine H1 receptor ligands contributing to a more accurate classification, and providing evidence for a more rational and safe use of them.
Collapse
Affiliation(s)
- Valeria Burghi
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Emiliana B Echeverría
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Carlos D Zappia
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Antonela Díaz Nebreda
- Laboratorio de Patología y Farmacología Molecular, Instituto de Biología y Medicina Experimental (IByME-CONICET), Buenos Aires, Argentina
| | - Sonia Ripoll
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Natalia Gómez
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Carina Shayo
- Laboratorio de Patología y Farmacología Molecular, Instituto de Biología y Medicina Experimental (IByME-CONICET), Buenos Aires, Argentina
| | - Carlos A Davio
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Federico Monczor
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Natalia C Fernández
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina; Instituto de Investigaciones Farmacológicas (ININFA, UBA, CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.
| |
Collapse
|
10
|
Höring C, Seibel U, Tropmann K, Grätz L, Mönnich D, Pitzl S, Bernhardt G, Pockes S, Strasser A. A Dynamic, Split-Luciferase-Based Mini-G Protein Sensor to Functionally Characterize Ligands at All Four Histamine Receptor Subtypes. Int J Mol Sci 2020; 21:ijms21228440. [PMID: 33182741 PMCID: PMC7698210 DOI: 10.3390/ijms21228440] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 11/06/2020] [Accepted: 11/08/2020] [Indexed: 02/06/2023] Open
Abstract
In drug discovery, assays with proximal readout are of great importance to study target-specific effects of potential drug candidates. In the field of G protein-coupled receptors (GPCRs), the determination of GPCR-G protein interactions and G protein activation by means of radiolabeled GTP analogs ([35S]GTPγS, [γ-32P]GTP) has widely been used for this purpose. Since we were repeatedly faced with insufficient quality of radiolabeled nucleotides, there was a requirement to implement a novel proximal functional assay for the routine characterization of putative histamine receptor ligands. We applied the split-NanoLuc to the four histamine receptor subtypes (H1R, H2R, H3R, H4R) and recently engineered minimal G (mini-G) proteins. Using this method, the functional response upon receptor activation was monitored in real-time and the four mini-G sensors were evaluated by investigating selected standard (inverse) agonists and antagonists. All potencies and efficacies of the studied ligands were in concordance with literature data. Further, we demonstrated a significant positive correlation of the signal amplitude and the mini-G protein expression level in the case of the H2R, but not for the H1R or the H3R. The pEC50 values of histamine obtained under different mini-G expression levels were consistent. Moreover, we obtained excellent dynamic ranges (Z’ factor) and the signal spans were improved for all receptor subtypes in comparison to the previously performed [35S]GTPγS binding assay.
Collapse
Affiliation(s)
- Carina Höring
- Correspondence: (C.H.); , (A.S.); Tel.: +49-941-943-4748 (C.H.); +49-941-943-4821 (A.S.)
| | | | | | | | | | | | | | | | - Andrea Strasser
- Correspondence: (C.H.); , (A.S.); Tel.: +49-941-943-4748 (C.H.); +49-941-943-4821 (A.S.)
| |
Collapse
|
11
|
Aneesha VA, Gopi RP, Kumawat S, Susanth VS, Vineetha S, Kumar D. Histamine receptors mediate contraction of reticular groove smooth muscle of adult goats. Anat Histol Embryol 2020; 49:440-450. [PMID: 32128873 DOI: 10.1111/ahe.12546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 01/12/2020] [Accepted: 02/04/2020] [Indexed: 11/28/2022]
Abstract
The present study was conducted to evaluate the effect of histamine and to characterise its receptor subtypes in reticular groove (RG) smooth muscle of adult goats. The studies were done using floor and lip regions of RG. We used tension experiments on smooth muscle of RG isolated from adult goat for functional characterisation of H1 and H2 receptors. Western blotting and immunohistochemistry experiments were conducted for molecular characterisation of these receptors. Histamine evoked concentration-dependent contraction of isolated RG circular and longitudinal smooth muscle preparation. Pyrilamine antagonised the action of histamine. Histamine did not induce any relaxant effect on RG preparations. Additionally, cimetidine did not produce any significant effect on histamine-induced response. Non-selective histaminic receptor antagonist cyproheptadine attenuated the contraction response to histamine in the smooth muscle. Molecular characterisation and localisation of H1 and H2 receptor proteins confirmed the presence of these receptors in RG. It is most likely that histamine-induced contractile effect in RG smooth muscle of goats is mediated by H1 histaminic receptors.
Collapse
Affiliation(s)
- V A Aneesha
- Division of Pharmacology and Toxicology, Indian Veterinary Research Institute, Izatnagar, India
| | - Renjith P Gopi
- Division of Pharmacology and Toxicology, Indian Veterinary Research Institute, Izatnagar, India
| | - Sanjay Kumawat
- Division of Pharmacology and Toxicology, Indian Veterinary Research Institute, Izatnagar, India
| | - V S Susanth
- Division of Pharmacology and Toxicology, Indian Veterinary Research Institute, Izatnagar, India
| | - S Vineetha
- Division of Pathology, Indian Veterinary Research Institute, Izatnagar, India
| | - Dinesh Kumar
- Division of Pharmacology and Toxicology, Indian Veterinary Research Institute, Izatnagar, India
| |
Collapse
|
12
|
Suppression of RGSz1 function optimizes the actions of opioid analgesics by mechanisms that involve the Wnt/β-catenin pathway. Proc Natl Acad Sci U S A 2018; 115:E2085-E2094. [PMID: 29440403 DOI: 10.1073/pnas.1707887115] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Regulator of G protein signaling z1 (RGSz1), a member of the RGS family of proteins, is present in several networks expressing mu opioid receptors (MOPRs). By using genetic mouse models for global or brain region-targeted manipulations of RGSz1 expression, we demonstrated that the suppression of RGSz1 function increases the analgesic efficacy of MOPR agonists in male and female mice and delays the development of morphine tolerance while decreasing the sensitivity to rewarding and locomotor activating effects. Using biochemical assays and next-generation RNA sequencing, we identified a key role of RGSz1 in the periaqueductal gray (PAG) in morphine tolerance. Chronic morphine administration promotes RGSz1 activity in the PAG, which in turn modulates transcription mediated by the Wnt/β-catenin signaling pathway to promote analgesic tolerance to morphine. Conversely, the suppression of RGSz1 function stabilizes Axin2-Gαz complexes near the membrane and promotes β-catenin activation, thereby delaying the development of analgesic tolerance. These data show that the regulation of RGS complexes, particularly those involving RGSz1-Gαz, represents a promising target for optimizing the analgesic actions of opioids without increasing the risk of dependence or addiction.
Collapse
|
13
|
Chen X, Wan J, Yu B, Diao Y, Zhang W. PIP5K1α promotes myogenic differentiation via AKT activation and calcium release. Stem Cell Res Ther 2018; 9:33. [PMID: 29426367 PMCID: PMC5806439 DOI: 10.1186/s13287-018-0770-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Revised: 12/01/2017] [Accepted: 01/05/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Skeletal muscle satellite cell-derived myoblasts are mainly responsible for postnatal muscle growth and injury-induced regeneration. Many intracellular signaling pathways are essential for myogenic differentiation, while a number of kinases are involved in this modulation process. Type I phosphatidylinositol 4-phosphate 5-kinase (PIP5KI) was identified as one of the key kinases involved in myogenic differentiation, but the underlying molecular mechanism is still unclear. METHODS PIP5K1α was quantified by quantitative reverse transcriptase PCR and western blot assay. Expression levels of myogenin and myosin heavy chain, which showed significant downregulation in PIP5K1α siRNA-mediated knockdown cells in western blot analysis, were confirmed by immunostaining. Phosphatidylinositol 4,5-bisphosphate in PIP5K1α siRNA-mediated knockdown cells was also measured by the PI(4,5)P2 Mass ELISA Kit. C2C12 cells were overexpressed with different forms of AKT, followed by western blot analysis on myogenin and myosin heavy chain, which reveals their function in myogenic differentiation. FLIPR assays are used to test the release of calcium in PIP5K1α siRNA-mediated knockdown cells after histamine or bradykinin treatment. Statistical significances between groups were determined by two-tailed Student's t test. RESULTS Since PIP5K1α was the major form in skeletal muscle, knockdown of PIP5K1α consistently inhibited myogenic differentiation while overexpression of PIP5K1α promoted differentiation and rescued the inhibitory effect of the siRNA. PIP5K1α was found to be required for AKT activation and calcium release, both of which were important for skeletal muscle differentiation. CONCLUSIONS Taken together, these results suggest that PIP5K1α is an important regulator in myoblast differentiation.
Collapse
Affiliation(s)
- Xiaofan Chen
- Shenzhen Key Laboratory for Translational Medicine of Dermatology, Biomedical Research Institute, Shenzhen Peking University-the Hong Kong University of Science and Technology Medical Center, Lianhua Road 1120, Shenzhen, 518036, Guangdong Province, China
| | - Jun Wan
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-the Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Bo Yu
- Shenzhen Key Laboratory for Translational Medicine of Dermatology, Biomedical Research Institute, Shenzhen Peking University-the Hong Kong University of Science and Technology Medical Center, Lianhua Road 1120, Shenzhen, 518036, Guangdong Province, China.,Department of Dermatology, Peking University Shenzhen Hospital, Shenzhen, 518036, Guangdong Province, China
| | - Yarui Diao
- Shenzhen Key Laboratory for Translational Medicine of Dermatology, Biomedical Research Institute, Shenzhen Peking University-the Hong Kong University of Science and Technology Medical Center, Lianhua Road 1120, Shenzhen, 518036, Guangdong Province, China. .,Ludwig Institute for Cancer Research, 9500 Gilman Drive, La Jolla, CA, 92093, USA.
| | - Wei Zhang
- Shenzhen Key Laboratory for Translational Medicine of Dermatology, Biomedical Research Institute, Shenzhen Peking University-the Hong Kong University of Science and Technology Medical Center, Lianhua Road 1120, Shenzhen, 518036, Guangdong Province, China.
| |
Collapse
|
14
|
Lieb S, Littmann T, Plank N, Felixberger J, Tanaka M, Schäfer T, Krief S, Elz S, Friedland K, Bernhardt G, Wegener J, Ozawa T, Buschauer A. Label-free versus conventional cellular assays: Functional investigations on the human histamine H 1 receptor. Pharmacol Res 2016; 114:13-26. [PMID: 27751876 DOI: 10.1016/j.phrs.2016.10.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 10/11/2016] [Accepted: 10/11/2016] [Indexed: 01/07/2023]
Abstract
A set of histamine H1 receptor (H1R) agonists and antagonists was characterized in functional assays, using dynamic mass redistribution (DMR), electric cell-substrate impedance sensing (ECIS) and various signaling pathway specific readouts (Fura-2 and aequorin calcium assays, arrestin recruitment (luciferase fragment complementation) assay, luciferase gene reporter assay). Data were gained from genetically engineered HEK293T cells and compared with reference data from GTPase assays and radioligand binding. Histamine and the other H1R agonists gave different assay-related pEC50 values, however, the order of potency was maintained. In the luciferase fragment complementation assay, the H1R preferred β-arrestin2 over β-arrestin1. The calcium and the impedimetric assay depended on Gq coupling of the H1R, as demonstrated by complete inhibition of the histamine-induced signals in the presence of the Gq inhibitor FR900359 (UBO-QIC). Whereas partial inhibition by FR900359 was observed in DMR and the gene reporter assay, pertussis toxin substantially decreased the response in DMR, but increased the luciferase signal, reflecting the contribution of both, Gq and Gi, to signaling in these assays. For antagonists, the results from DMR were essentially compatible with those from conventional readouts, whereas the impedance-based data revealed a trend towards higher pKb values. ECIS and calcium assays apparently only reflect Gq signaling, whereas DMR and gene reporter assays appear to integrate both, Gq and Gi mediated signaling. The results confirm the value of the label-free methods, DMR and ECIS, for the characterization of H1R ligands. Both noninvasive techniques are complementary to each other, but cannot fully replace reductionist signaling pathway focused assays.
Collapse
Affiliation(s)
- S Lieb
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - T Littmann
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - N Plank
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - J Felixberger
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - M Tanaka
- Department of Chemistry, School of Science, University of Tokyo, Tokyo, Japan
| | - T Schäfer
- Department of Chemistry and Pharmacy, Molecular and Clinical Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
| | - S Krief
- Bioprojet Biotech, 35762 Saint-Grégoire, France
| | - S Elz
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - K Friedland
- Department of Chemistry and Pharmacy, Molecular and Clinical Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
| | - G Bernhardt
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - J Wegener
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany
| | - T Ozawa
- Department of Chemistry, School of Science, University of Tokyo, Tokyo, Japan
| | - A Buschauer
- Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany.
| |
Collapse
|
15
|
Monczor F, Fernandez N. Current Knowledge and Perspectives on Histamine H1 and H2 Receptor Pharmacology: Functional Selectivity, Receptor Crosstalk, and Repositioning of Classic Histaminergic Ligands. Mol Pharmacol 2016; 90:640-648. [PMID: 27625037 DOI: 10.1124/mol.116.105981] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/12/2016] [Indexed: 12/14/2022] Open
Abstract
H1 and H2 histamine receptor antagonists, although developed many decades ago, are still effective for the treatment of allergic and gastric acid-related conditions. This article focuses on novel aspects of the pharmacology and molecular mechanisms of histamine receptors that should be contemplated for optimizing current therapies, repositioning histaminergic ligands for new therapeutic uses, or even including agonists of the histaminergic system in the treatment of different pathologies such as leukemia or neurodegenerative disorders. In recent years, new signaling phenomena related to H1 and H2 receptors have been described that make them suitable for novel therapeutic approaches. Crosstalk between histamine receptors and other membrane or nuclear receptors can be envisaged as a way to modulate other signaling pathways and to potentiate the efficacy of drugs acting on different receptors. Likewise, biased signaling at histamine receptors seems to be a pharmacological feature that can be exploited to investigate nontraditional therapeutic uses for H1 and H2 biased agonists in malignancies such as acute myeloid leukemia and to avoid undesired side effects when used in standard treatments. It is hoped that the molecular mechanisms discussed in this review contribute to a better understanding of the different aspects involved in histamine receptor pharmacology, which in turn will contribute to increased drug efficacy, avoidance of adverse effects, or repositioning of histaminergic ligands.
Collapse
Affiliation(s)
- Federico Monczor
- Instituto de Investigaciones Farmacológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Natalia Fernandez
- Instituto de Investigaciones Farmacológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
16
|
Jurič DM, Kržan M, Lipnik-Stangelj M. Histamine and astrocyte function. Pharmacol Res 2016; 111:774-783. [DOI: 10.1016/j.phrs.2016.07.035] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 07/11/2016] [Accepted: 07/24/2016] [Indexed: 12/31/2022]
|
17
|
Panula P, Chazot PL, Cowart M, Gutzmer R, Leurs R, Liu WLS, Stark H, Thurmond RL, Haas HL. International Union of Basic and Clinical Pharmacology. XCVIII. Histamine Receptors. Pharmacol Rev 2016; 67:601-55. [PMID: 26084539 DOI: 10.1124/pr.114.010249] [Citation(s) in RCA: 374] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Histamine is a developmentally highly conserved autacoid found in most vertebrate tissues. Its physiological functions are mediated by four 7-transmembrane G protein-coupled receptors (H1R, H2R, H3R, H4R) that are all targets of pharmacological intervention. The receptors display molecular heterogeneity and constitutive activity. H1R antagonists are long known antiallergic and sedating drugs, whereas the H2R was identified in the 1970s and led to the development of H2R-antagonists that revolutionized stomach ulcer treatment. The crystal structure of ligand-bound H1R has rendered it possible to design new ligands with novel properties. The H3R is an autoreceptor and heteroreceptor providing negative feedback on histaminergic and inhibition on other neurons. A block of these actions promotes waking. The H4R occurs on immuncompetent cells and the development of anti-inflammatory drugs is anticipated.
Collapse
Affiliation(s)
- Pertti Panula
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Paul L Chazot
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Marlon Cowart
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Ralf Gutzmer
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Rob Leurs
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Wai L S Liu
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Holger Stark
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Robin L Thurmond
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| | - Helmut L Haas
- Department of Anatomy, and Neuroscience Center, University of Helsinki, Finland (P.P.); School of Biological and Biomedical Sciences, University of Durham, United Kingdom (P.L.C.); AbbVie, Inc. North Chicago, Illinois (M.C.); Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany (R.G.); Department of Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines and Systems, VU University Amsterdam, The Netherlands (R.L.); Ziarco Pharma Limited, Canterbury, United Kingdom (W.L.S.L.); Institute of Pharmaceutical and Medical Chemistry and Institute of Neurophysiology, Medical Faculty, Westfalische-Wilhelms-University, Muenster, Germany (H.L.H.); Heinrich-Heine-University Duesseldorf, Germany (H.S.); and Janssen Research & Development, LLC, San Diego, California (R.L.T.)
| |
Collapse
|
18
|
Szteyn K, Gomez R, Berg KA, Jeske NA. Divergence in endothelin-1- and bradykinin-activated store-operated calcium entry in afferent sensory neurons. ASN Neuro 2015; 7:7/2/1759091415578714. [PMID: 25873305 PMCID: PMC4397213 DOI: 10.1177/1759091415578714] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Endothelin-1 (ET-1) and bradykinin (BK) are endogenous peptides that signal through Gαq/11-protein coupled receptors (GPCRs) to produce nociceptor sensitization and pain. Both peptides activate phospholipase C to stimulate Ca2+ accumulation, diacylglycerol production, and protein kinase C activation and are rapidly desensitized via a G-protein receptor kinase 2-dependent mechanism. However, ET-1 produces a greater response and longer lasting nocifensive behavior than BK in multiple models, indicating a potentially divergent signaling mechanism in primary afferent sensory neurons. Using cultured sensory neurons, we demonstrate significant differences in both Ca2+ influx and Ca2+ release from intracellular stores following ET-1 and BK treatments. As intracellular store depletion may contribute to the regulation of other signaling cascades downstream of GPCRs, we concentrated our investigation on store-operated Ca2+ channels. Using pharmacological approaches, we identified transient receptor potential canonical channel 3 (TRPC3) as a dominant contributor to Ca2+ influx subsequent to ET-1 treatment. On the other hand, BK treatment stimulated Orai1 activation, with only minor input from TRPC3. Taken together, data presented here suggest that ET-1 signaling targets TRPC3, generating a prolonged Ca2+ signal that perpetuates nocifensive responses. In contrast, Orai1 dominates as the downstream target of BK receptor activation and results in transient intracellular Ca2+ increases and abridged nocifensive responses.
Collapse
Affiliation(s)
- Kalina Szteyn
- Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, TX, USA
| | - Ruben Gomez
- Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, TX, USA
| | - Kelly A Berg
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, TX, USA
| | - Nathaniel A Jeske
- Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, TX, USA Department of Pharmacology, University of Texas Health Science Center at San Antonio, TX, USA Department of Physiology, University of Texas Health Science Center at San Antonio, TX, USA
| |
Collapse
|
19
|
Bouhadfane M, Kaszás A, Rózsa B, Harris-Warrick RM, Vinay L, Brocard F. Sensitization of neonatal rat lumbar motoneuron by the inflammatory pain mediator bradykinin. eLife 2015; 4:e06195. [PMID: 25781633 PMCID: PMC4410746 DOI: 10.7554/elife.06195] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Accepted: 03/16/2015] [Indexed: 11/27/2022] Open
Abstract
Bradykinin (Bk) is a potent inflammatory mediator that causes hyperalgesia. The action of Bk on the sensory system is well documented but its effects on motoneurons, the final pathway of the motor system, are unknown. By a combination of patch-clamp recordings and two-photon calcium imaging, we found that Bk strongly sensitizes spinal motoneurons. Sensitization was characterized by an increased ability to generate self-sustained spiking in response to excitatory inputs. Our pharmacological study described a dual ionic mechanism to sensitize motoneurons, including inhibition of a barium-sensitive resting K+ conductance and activation of a nonselective cationic conductance primarily mediated by Na+. Examination of the upstream signaling pathways provided evidence for postsynaptic activation of B2 receptors, G protein activation of phospholipase C, InsP3 synthesis, and calmodulin activation. This study questions the influence of motoneurons in the assessment of hyperalgesia since the withdrawal motor reflex is commonly used as a surrogate pain model. DOI:http://dx.doi.org/10.7554/eLife.06195.001 When we accidentally place our hand on a hot stove, we normally experience a painful sensation that starts with the sensory nerves under our skin. These nerves respond by transmitting electrical impulses to our brain, where the painful sensation is then processed. At the same time, these impulses are also transmitted to the motor nerves that control the muscles in our hand to trigger an immediate reflex to withdraw the hand from the hot stove. Pain therefore has a useful role as it can reduce how bad an injury is. People with a condition called hyperalgesia have an increased sensitivity to pain. This condition can result from a chemical called bradykinin ‘sensitizing’ the sensory nerves, causing them to transmit more electrical impulses in response to pain than normal. This makes the injury feel much more painful, and can make the pain last for longer than is beneficial. It was less clear whether bradykinin also affects motor nerves and so triggers a withdrawal reflex. By recording the electrical activity of motor nerve cells taken from the spinal cords of newborn rats, Bouhadfane et al. now show that these motor nerves become more active when exposed to bradykinin. Nerve cells generate electrical signals when ions—such as potassium, sodium, and calcium ions—move through channels in the membranes of the cell. Therefore, to investigate how bradykinin influences the electrical activity of motor nerves, Bouhadfane et al. exposed the cells to drugs that inhibit particular ion channels. This revealed that bradykinin sensitizes the motor nerves by blocking a type of potassium ion channel and activating another ion channel that mainly transports sodium ions. Furthermore, Bouhadfane et al. were able to identify the signaling pathways that allow bradykinin to affect the motor nerve cells. The study implies that the neuronal circuitry for pain does not rely exclusively on sensory nerve cells but should also integrate motor nerve cells. A future challenge remains in developing a protocol to resolve the contribution of motor nerve cells to hyperalgesia assessed by reflex withdrawal. DOI:http://dx.doi.org/10.7554/eLife.06195.002
Collapse
Affiliation(s)
- Mouloud Bouhadfane
- Institut de Neurosciences de la Timone (UMR7289), Aix-Marseille Université and CNRS, Marseille, France
| | - Attila Kaszás
- Institut de Neuroscience des Systèmes (UMR1106), Aix Marseille Université and INSERM, Marseille, France
| | - Balázs Rózsa
- Two-Photon Imaging Center, Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, Hungary
| | | | - Laurent Vinay
- Institut de Neurosciences de la Timone (UMR7289), Aix-Marseille Université and CNRS, Marseille, France
| | - Frédéric Brocard
- Institut de Neurosciences de la Timone (UMR7289), Aix-Marseille Université and CNRS, Marseille, France
| |
Collapse
|
20
|
Souza GV, Simas AS, Bastos-Pereira AL, Frois GRA, Ribas JLC, Verdan MH, Kassuya CAL, Stefanello ME, Zampronio AR. Antinociceptive activity of the ethanolic extract, fractions, and aggregatin D isolated from Sinningia aggregata tubers. PLoS One 2015; 10:e0117501. [PMID: 25719394 PMCID: PMC4342217 DOI: 10.1371/journal.pone.0117501] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 12/26/2014] [Indexed: 01/06/2023] Open
Abstract
The present study investigated the effects of the ethanolic extract (ESa), fractions, and compounds isolated from Sinningia aggregata in male Swiss mice on carrageenan-induced paw edema, neutrophil migration, mechanical hyperalgesia, formalin-induced nociception, and lipopolysaccharide-induced fever. The ESa did not alter edema, neutrophil migration, or fever at any of the doses tested. However, the ESa reduced phase II of formalin-induced nociception and carrageenan-induced mechanical hyperalgesia. The petroleum ether (PE) and ethyl acetate (EA) fractions and aggregatin D (AgD; isolated from the EA fraction) reduced formalin-induced nociception. Anthraquinones from the PE fraction were ineffective. AgD also inhibited carrageenan-induced mechanical hyperalgesia. Neither the ESa nor AgD altered thermal nociception or motor performance. Local administration of AgD also reduced hyperalgesia induced by carrageenan, bradykinin, tumor necrosis factor-α, interleukin-1β, cytokine-induced neutrophil chemoattractant, prostaglandin E2, and dopamine but not hyperalgesia induced by forskolin or dibutyryl cyclic adenosine monophosphate. The positive control dipyrone reduced the response induced by all of the stimuli. Additionally, glibenclamide abolished the analgesic effect of dipyrone but not the one induced by AgD. AgD did not change lipopolysaccharide-induced nitric oxide production by macrophages or the nociception induced by capsaicin, cinnamaldehyde, acidified saline, or menthol. These results suggest that the ESa has important antinociceptive activity, and this activity results at least partially from the presence of AgD. AgD reduced mechanical hyperalgesia induced by several inflammatory mediators through mechanisms that are different from classic analgesic drugs.
Collapse
Affiliation(s)
- Geórgea V. Souza
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
| | - Alex S. Simas
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
| | - Amanda L. Bastos-Pereira
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
| | - Gisele R. A. Frois
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
| | - João L. C. Ribas
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
| | - Maria H. Verdan
- Department of Chemistry, Federal University of Paraná, Centro Politécnico, PO Box 19081, Curitiba, PR, 81530-900, Brazil
| | - Cândida A. L. Kassuya
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
| | - Maria E. Stefanello
- Department of Chemistry, Federal University of Paraná, Centro Politécnico, PO Box 19081, Curitiba, PR, 81530-900, Brazil
| | - Aleksander R. Zampronio
- Department of Pharmacology, Federal University of Paraná, Centro Politécnico, PO Box 19031, Curitiba, PR, 81531-980, Brazil
- * E-mail:
| |
Collapse
|
21
|
Abstract
Heterotrimeric G proteins play a crucial role in regulating signal processing to maintain normal cellular homeostasis, and subtle perturbations in its activity can potentially lead to the pathogenesis of renal disorders or diseases. Cell-surface receptors and accessory proteins, which normally modify and organize the coupling of individual G protein subunits, contribute to the regulation of heterotrimeric G protein activity and their convergence and/or divergence of downstream signaling initiated by effector systems. Activators of G protein signaling (AGS) are a family of accessory proteins that intervene at multiple distinct points during the activation-inactivation cycle of G proteins, even in the absence of receptor stimulation. Perturbations in the expression of individual AGS proteins have been reported to modulate signal transduction pathways in a wide array of diseases and disorders within the brain, heart, immune system, and more recently, the kidney. This review will provide an overview of the expression profile, localization, and putative biologic role of the AGS family in the context of normal and diseased states of the kidney.
Collapse
Affiliation(s)
- Frank Park
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, Tennessee
| |
Collapse
|
22
|
Fülöp L, Rajki A, Katona D, Szanda G, Spät A. Extramitochondrial OPA1 and adrenocortical function. Mol Cell Endocrinol 2013; 381:70-9. [PMID: 23906536 DOI: 10.1016/j.mce.2013.07.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/19/2013] [Accepted: 07/19/2013] [Indexed: 02/06/2023]
Abstract
We have previously described that silencing of the mitochondrial protein OPA1 enhances mitochondrial Ca(2+) signaling and aldosterone production in H295R adrenocortical cells. Since extramitochondrial OPA1 (emOPA1) was reported to facilitate cAMP-induced lipolysis, we hypothesized that emOPA1, via the enhanced hydrolysis of cholesterol esters, augments aldosterone production in H295R cells. A few OPA1 immunopositive spots were detected in ∼40% of the cells. In cell fractionation studies OPA1/COX IV (mitochondrial marker) ratio in the post-mitochondrial fractions was an order of magnitude higher than that in the mitochondrial fraction. The ratio of long to short OPA1 isoforms was lower in post-mitochondrial than in mitochondrial fractions. Knockdown of OPA1 failed to reduce db-cAMP-induced phosphorylation of hormone-sensitive lipase (HSL), Ca(2+) signaling and aldosterone secretion. In conclusion, OPA1 could be detected in the post-mitochondrial fractions, nevertheless, OPA1 did not interfere with the cAMP - PKA - HSL mediated activation of aldosterone secretion.
Collapse
Affiliation(s)
- László Fülöp
- Department of Physiology, Faculty of Medicine, Semmelweis University, Hungary
| | | | | | | | | |
Collapse
|
23
|
Amphetamine actions at the serotonin transporter rely on the availability of phosphatidylinositol-4,5-bisphosphate. Proc Natl Acad Sci U S A 2013; 110:11642-7. [PMID: 23798435 DOI: 10.1073/pnas.1220552110] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Nerve functions require phosphatidylinositol-4,5-bisphosphate (PIP2) that binds to ion channels, thereby controlling their gating. Channel properties are also attributed to serotonin transporters (SERTs); however, SERT regulation by PIP2 has not been reported. SERTs control neurotransmission by removing serotonin from the extracellular space. An increase in extracellular serotonin results from transporter-mediated efflux triggered by amphetamine-like psychostimulants. Herein, we altered the abundance of PIP2 by activating phospholipase-C (PLC), using a scavenging peptide, and inhibiting PIP2-synthesis. We tested the effects of the verified scarcity of PIP2 on amphetamine-triggered SERT functions in human cells. We observed an interaction between SERT and PIP2 in pull-down assays. On decreased PIP2 availability, amphetamine-evoked currents were markedly reduced compared with controls, as was amphetamine-induced efflux. Signaling downstream of PLC was excluded as a cause for these effects. A reduction of substrate efflux due to PLC activation was also found with recombinant noradrenaline transporters and in rat hippocampal slices. Transmitter uptake was not affected by PIP2 reduction. Moreover, SERT was revealed to have a positively charged binding site for PIP2. Mutation of the latter resulted in a loss of amphetamine-induced SERT-mediated efflux and currents, as well as a lack of PIP2-dependent effects. Substrate uptake and surface expression were comparable between mutant and WT SERTs. These findings demonstrate that PIP2 binding to monoamine transporters is a prerequisite for amphetamine actions without being a requirement for neurotransmitter uptake. These results open the way to target amphetamine-induced SERT-dependent actions independently of normal SERT function and thus to treat psychostimulant addiction.
Collapse
|
24
|
Alves CR, Alves GB, Pereira AC, Trombetta IC, Dias RG, Mota GFA, Fernandes T, Krieger JE, Negrão CE, Oliveira EM. Vascular reactivity and ACE activity response to exercise training are modulated by the +9/−9 bradykinin B2 receptor gene functional polymorphism. Physiol Genomics 2013; 45:487-92. [DOI: 10.1152/physiolgenomics.00065.2012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The bradykinin receptor B2 ( BDKRB 2) gene +9/−9 polymorphism has been associated with higher gene transcriptional activity, and characteristics of cardiovascular phenotypes and physical performance. We hypothesized that vasodilation and ACE activity response to exercise training is modulated by BDKRB 2 gene. We genotyped 71 healthy volunteers were genotyped for the BDKRB 2 gene polymorphism. Heart rate (HR), mean blood pressure (MBP), and forearm blood flow (FBF) were evaluated. Angiotensin-I converting enzyme (ACE) activity was measured by fluorescence. Aerobic training was performed for 16 wk. All variables were reassessed after completion of the training period. In pretraining period, HR, MBP, FBF, and forearm vascular conductance (FVC) were similar among all genotypes. After physical training, the FBF and the FVC response during handgrip exercise such as area under the curve were higher in −9/−9 carriers than the other two groups. However, there were no changes in HR and MBP for all three groups. In addition, in posttraining period the decrease in ACE activity was higher in the −9/−9 group than the other two groups. These results suggest that reflex muscle vasodilation and ACE activity in response to exercise training are modulated by BDKRB 2 gene +9/−9 polymorphism in healthy individuals.
Collapse
Affiliation(s)
- Cléber Rene Alves
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil; and
| | | | | | | | | | - Glória F. A. Mota
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil; and
| | - Tiago Fernandes
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil; and
| | - José Eduardo Krieger
- Heart Institute (Incor), Medical School, University of São Paulo, São Paulo, Brazil
| | | | | |
Collapse
|
25
|
Petho G, Reeh PW. Sensory and signaling mechanisms of bradykinin, eicosanoids, platelet-activating factor, and nitric oxide in peripheral nociceptors. Physiol Rev 2013; 92:1699-775. [PMID: 23073630 DOI: 10.1152/physrev.00048.2010] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Peripheral mediators can contribute to the development and maintenance of inflammatory and neuropathic pain and its concomitants (hyperalgesia and allodynia) via two mechanisms. Activation or excitation by these substances of nociceptive nerve endings or fibers implicates generation of action potentials which then travel to the central nervous system and may induce pain sensation. Sensitization of nociceptors refers to their increased responsiveness to either thermal, mechanical, or chemical stimuli that may be translated to corresponding hyperalgesias. This review aims to give an account of the excitatory and sensitizing actions of inflammatory mediators including bradykinin, prostaglandins, thromboxanes, leukotrienes, platelet-activating factor, and nitric oxide on nociceptive primary afferent neurons. Manifestations, receptor molecules, and intracellular signaling mechanisms of the effects of these mediators are discussed in detail. With regard to signaling, most data reported have been obtained from transfected nonneuronal cells and somata of cultured sensory neurons as these structures are more accessible to direct study of sensory and signal transduction. The peripheral processes of sensory neurons, where painful stimuli actually affect the nociceptors in vivo, show marked differences with respect to biophysics, ultrastructure, and equipment with receptors and ion channels compared with cellular models. Therefore, an effort was made to highlight signaling mechanisms for which supporting data from molecular, cellular, and behavioral models are consistent with findings that reflect properties of peripheral nociceptive nerve endings. Identified molecular elements of these signaling pathways may serve as validated targets for development of novel types of analgesic drugs.
Collapse
Affiliation(s)
- Gábor Petho
- Pharmacodynamics Unit, Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs, Hungary
| | | |
Collapse
|
26
|
Albert-Weißenberger C, Sirén AL, Kleinschnitz C. Ischemic stroke and traumatic brain injury: the role of the kallikrein-kinin system. Prog Neurobiol 2012; 101-102:65-82. [PMID: 23274649 DOI: 10.1016/j.pneurobio.2012.11.004] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 11/15/2012] [Accepted: 11/20/2012] [Indexed: 12/16/2022]
Abstract
Acute ischemic stroke and traumatic brain injury are a major cause of mortality and morbidity. Due to the paucity of therapies, there is a pressing clinical demand for new treatment options. Successful therapeutic strategies for these conditions must target multiple pathophysiological mechanisms occurring at different stages of brain injury. In this respect, the kallikrein-kinin system is an ideal target linking key pathological hallmarks of ischemic and traumatic brain damage such as edema formation, inflammation, and thrombosis. In particular, the kinin receptors, plasma kallikrein, and coagulation factor XIIa are highly attractive candidates for pharmacological development, as kinin receptor antagonists or inhibitors of plasma kallikrein and coagulation factor XIIa are neuroprotective in animal models of stroke and traumatic brain injury. Nevertheless, conflicting preclinical evaluation as well as limited and inconclusive data from clinical trials suggest caution when transferring observations made in animals into the human situation. This review summarizes current evidence on the pathological significance of the kallikrein-kinin system during ischemic and traumatic brain damage, with a particular focus on experimental data derived from animal models. Experimental findings are also compared with human data if available, and potential therapeutic implications are discussed.
Collapse
|
27
|
Facilitation of sympathetic neurotransmission by phosphatidylinositol-4,5-bisphosphate-dependent regulation of KCNQ channels in rat mesenteric arteries. Hypertens Res 2012; 35:909-16. [PMID: 22592664 DOI: 10.1038/hr.2012.61] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Sympathetic nerves regulate vascular tone by releasing neurotransmitters into the vasculature. We previously demonstrated that bradykinin facilitates sympathetic neurotransmission in rat mesenteric arteries. Although little is known about the intracellular mechanism modulating this neurotransmission, recent cell line experiments have shown that the KCNQ channel, which is inhibited by the depletion of membrane phosphatidylinositol-4,5-bisphosphate (PIP₂), participates in the control of neurotransmission by bradykinin. In the present study, we examined the mechanism regulating neurotransmitter release from rat perivascular sympathetic nerves. Excitatory junction potentials (EJPs) elicited by repetitive nerve stimulation (1 Hz, 11 pulses, 20 μs, 20-50 V), a measure of sympathetic purinergic neurotransmission, were recorded with a conventional microelectrode technique in rat mesenteric arteries. Bradykinin (10⁻⁷ mol l⁻¹) significantly enhanced the amplitude of EJPs (n=22, P<0.05). This enhancing effect was abolished by N-type calcium-channel inhibition with ω-conotoxin GVIA (2 × 10⁻⁹ mol ⁻¹l, n=8). The blockade of phospholipase C with U-73122 (10(-6) mol l⁻¹, n=17) also eliminated the facilitatory effect of bradykinin. In addition, the effects of bradykinin were diminished by the prevention of PIP₂ resynthesis with wortmannin (10⁻⁵ mol l⁻¹ n=7) or KCNQ channel inhibition with XE-991 (10⁻⁵ mol l⁻¹, n=7). On the other hand, depletion of intracellular calcium stores with cyclopiazonic acid (3 × 10⁻⁶ mol l⁻¹, n=6) or the inhibition of protein kinase C with bisindolylmaleimide-I (10⁻⁶ mol l⁻¹, n=9) did not alter the action of bradykinin. These data demonstrate that the hydrolysis of PIP₂ by phospholipase C, which is activated by G(q/11)-coupled receptors, and subsequent KCNQ channel inhibition enhance sympathetic purinergic neurotransmission presumably via the activation of N-type calcium channels in rat mesenteric arteries.
Collapse
|
28
|
Gabay M, Pinter ME, Wright FA, Chan P, Murphy AJ, Valenzuela DM, Yancopoulos GD, Tall GG. Ric-8 proteins are molecular chaperones that direct nascent G protein α subunit membrane association. Sci Signal 2011; 4:ra79. [PMID: 22114146 DOI: 10.1126/scisignal.2002223] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Ric-8A (resistance to inhibitors of cholinesterase 8A) and Ric-8B are guanine nucleotide exchange factors that enhance different heterotrimeric guanine nucleotide-binding protein (G protein) signaling pathways by unknown mechanisms. Because transgenic disruption of Ric-8A or Ric-8B in mice caused early embryonic lethality, we derived viable Ric-8A- or Ric-8B-deleted embryonic stem (ES) cell lines from blastocysts of these mice. We observed pleiotropic G protein signaling defects in Ric-8A(-/-) ES cells, which resulted from reduced steady-state amounts of Gα(i), Gα(q), and Gα(13) proteins to <5% of those of wild-type cells. The amounts of Gα(s) and total Gβ protein were partially reduced in Ric-8A(-/-) cells compared to those in wild-type cells, and only the amount of Gα(s) was reduced substantially in Ric-8B(-/-) cells. The abundances of mRNAs encoding the G protein α subunits were largely unchanged by loss of Ric-8A or Ric-8B. The plasma membrane residence of G proteins persisted in the absence of Ric-8 but was markedly reduced compared to that in wild-type cells. Endogenous Gα(i) and Gα(q) were efficiently translated in Ric-8A(-/-) cells but integrated into endomembranes poorly; however, the reduced amounts of G protein α subunits that reached the membrane still bound to nascent Gβγ. Finally, Gα(i), Gα(q), and Gβ(1) proteins exhibited accelerated rates of degradation in Ric-8A(-/-) cells compared to those in wild-type cells. Together, these data suggest that Ric-8 proteins are molecular chaperones required for the initial association of nascent Gα subunits with cellular membranes.
Collapse
Affiliation(s)
- Meital Gabay
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Andrade EL, Meotti FC, Calixto JB. TRPA1 antagonists as potential analgesic drugs. Pharmacol Ther 2011; 133:189-204. [PMID: 22119554 DOI: 10.1016/j.pharmthera.2011.10.008] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 10/29/2011] [Indexed: 12/16/2022]
Abstract
The necessity of safe and effective treatments for chronic pain has intensified the search for new analgesic drugs. In the last few years, members of a closely-related family of ion channels, called transient receptor potential (TRP) have been identified in different cell types and their functions in physiological and pathological conditions have been characterized. The transient receptor potential ankyrin 1 (TRPA1), originally called ANKTM1 (ankyrin-like with transmembrane domains protein 1), is a molecule that has been conserved in different species during evolution; TRPA1 is a cation channel that functions as a cellular sensor, detecting mechanical, chemical and thermal stimuli, being a component of neuronal, epithelial, blood and smooth muscle tissues. In mammals, TRPA1 is largely expressed in primary sensory neurons that mediate somatosensory processes and nociceptive transmission. Recent studies have described the role of TRPA1 in inflammatory and neuropathic pain. However, its participation in cold sensation has not been agreed in different studies. In this review, we focus on data that support the relevance of the activation and blockade of TRPA1 in pain transmission, as well as the mechanisms underlying its activation and modulation by exogenous and endogenous stimuli. We also discuss recent advances in the search for new analgesic medicines targeting the TRPA1 channel.
Collapse
Affiliation(s)
- E L Andrade
- Departamento de Farmacologia, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | | | | |
Collapse
|
30
|
|
31
|
Smit MJ, Hoffmann M, Timmerman H, Leurs R. Molecular properties and signalling pathways of the histamine H1
receptor. Clin Exp Allergy 2009. [DOI: 10.1046/j.1365-2222.1999.00007.x-i1] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
32
|
Freeman JE, Kuo WY, Milligan G, Lowenstein CJ, Levine MA, Flavahan NA. Analysis of Pertussis Toxin-Sensitive Receptor: G-Protein Interactions in Native Porcine Endothelial Cells. ACTA ACUST UNITED AC 2009. [DOI: 10.3109/10623329509024674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
33
|
Mizumura K, Sugiura T, Katanosaka K, Banik RK, Kozaki Y. Excitation and sensitization of nociceptors by bradykinin: what do we know? Exp Brain Res 2009; 196:53-65. [PMID: 19396590 DOI: 10.1007/s00221-009-1814-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2008] [Accepted: 04/09/2009] [Indexed: 10/20/2022]
Abstract
Bradykinin is an endogenous nonapeptide known to induce pain and hyperalgesia to heat and mechanical stimulation. Correspondingly, it excites nociceptors in various tissues and sensitizes them to heat, whereas sensitizing effect on the mechanical response of nociceptors is not well established. Protein kinase C and TRPV1 contribute to the sensitizing mechanism of bradykinin to heat. In addition, TRPA1 and other ion channels appear to contribute to excitation caused by bradykinin. Finally, prostaglandins sensitize bradykinin-induced excitation in normal tissues by restoring desensitized responses due to the inhibition of protein kinase A.
Collapse
Affiliation(s)
- Kazue Mizumura
- Division of Stress Recognition and Response, Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan.
| | | | | | | | | |
Collapse
|
34
|
Matsumoto Y, Funahashi J, Mori K, Hayashi K, Yano H. The noncompetitive antagonism of histamine H1 receptors expressed in Chinese hamster ovary cells by olopatadine hydrochloride: its potency and molecular mechanism. Pharmacology 2008; 81:266-74. [PMID: 18268402 DOI: 10.1159/000115970] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Accepted: 11/13/2007] [Indexed: 11/19/2022]
Abstract
Calcium responses to various concentrations of histamine were monitored in Chinese hamster ovary cells stably expressing the human histamine H(1) receptor. The effects of various histamine H(1) receptor antagonists on the dose-response curve for histamine were evaluated. Olopatadine hydrochloride (olopatadine) inhibited the histamine-induced maximum response (pD(2)': 7.5) but had insignificant effects on histamine EC(50) values. This noncompetitive property exhibited by olopatadine, which was also observed in human umbilical vein endothelial cells, was the most striking among the antihistamines tested in this study. The geometrical isomer of olopatadine (E-isomer), which had a similar binding affinity to the histamine H(1) receptor as olopatadine, showed a mixed antagonistic profile (competitive and noncompetitive). These results indicate that the geometry around the double bond in the dimethylaminopropylidene group is critical for the potent noncompetitive property of olopatadine. Furthermore, binding mode analyses suggest that the protonated amine group in the dimethylaminopropylidene moiety of olopatadine forms an ionic bond with Glu 181 that is present in the second extracellular loop of the histamine H(1) receptor, whereas the amine group of the E-isomer does not. The second extracellular loop in aminergic G-protein-coupled receptors contributes to ligand binding and therefore the noncompetitive property of olopatadine may be explained by the interaction with Glu 181.
Collapse
Affiliation(s)
- Yuichi Matsumoto
- Pharmaceutical Research Center, Kyowa Hakko Kogyo Co., Ltd., Japan
| | | | | | | | | |
Collapse
|
35
|
Kim SH, Youm JH, Lee DK, Park SY, Shin CY, Ryu JS, La HO, Song HJ, Min YS, Sohn UD. Effect of hydrogen peroxide on VIP-induced relaxation of the cat lower esophageal sphincter. Arch Pharm Res 2008; 30:1419-25. [PMID: 18087810 DOI: 10.1007/bf02977366] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We investigated the effects of hydrogen peroxide (H2O2) on relaxation of the cat lower esophageal sphincter (LES). Vasoactive intestinal peptide (VIP) caused dose-dependent relaxation of LES, and H2O2 reduced VIP-induced relaxation. Relaxation was also attenuated by pertussis toxin (PTX), indicating a Gi/o component. VIP treatment increased [35S]GTPgammaS binding to Gs and Gi3 protein, but not to Go, Gq, Gil or Gi2. This increase in Gs or Gi3 binding was reduced by H2O2. However, the relaxation induced by sodium nitroprusside (SNP), 3-morpholino sydnomine (SIN-1), 8-br cGMP (cGMP analog), forskolin (adenylate cyclase activator), and dibutyryl-cAMP (a stable cAMP analog) was not reduced by H2O2. These data suggest that H202 inhibits VIP-induced relaxation via a Gi-dependent pathway, perhaps by inhibiting the activation of G(i3) or Gs downstream of the VIP receptor and independent of cAMP or NO-cGMP signaling.
Collapse
Affiliation(s)
- Sung Hyo Kim
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul 156-756, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Sternweis PC, Smrcka AV. G proteins in signal transduction: the regulation of phospholipase C. CIBA FOUNDATION SYMPOSIUM 2007; 176:96-106; discussion 106-11. [PMID: 8299429 DOI: 10.1002/9780470514450.ch7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The hydrolysis of phosphatidylinositol 4,5-bisphosphate by specific phospholipase C (PLC) enzymes produces two second messengers, inositol 1,4,5-trisphosphate and diacylglycerol. Heterotrimeric guanine nucleotide-binding regulatory proteins (G proteins) of the Gq subfamily activate the PLC beta 1 isoform of PLC. We have purified three isozymes of PLC beta: PLC beta 1 and PLC beta 3 from rat brain and PLC beta 2 from HL-60 cells. Whereas the beta 1 and beta 2 isozymes appear restricted to a few cell types, beta 3 is broadly distributed. Gq alpha (the alpha subunit of the Gq subfamily) can activate all three isoforms but PLC beta 2 is much less sensitive. Thus all three enzymes are potential effectors for pertussis toxin-insensitive regulation by hormones. The three beta isozymes can also be activated by purified beta gamma subunits. The PLC beta 3 isoform gives the greatest activation with beta gamma; PLC beta 1 is least responsive. The results indicate that all the known isoforms of mammalian PLC beta can be regulated at unique sites by both Gq alpha and beta gamma subunits. The effect of beta gamma subunits may provide a pathway for the regulation of PLC beta isozymes by pertussis toxin-sensitive G proteins or may indicate that the alpha subunit of Gq and its associated beta gamma both participate in regulation of the same phospholipase molecule.
Collapse
Affiliation(s)
- P C Sternweis
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas 75235-9041
| | | |
Collapse
|
37
|
Krumins AM, Gilman AG. Targeted knockdown of G protein subunits selectively prevents receptor-mediated modulation of effectors and reveals complex changes in non-targeted signaling proteins. J Biol Chem 2006; 281:10250-62. [PMID: 16446365 DOI: 10.1074/jbc.m511551200] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Heterotrimeric G protein signaling specificity has been attributed to select combinations of Galpha, beta, and gamma subunits, their interactions with other signaling proteins, and their localization in the cell. With few exceptions, the G protein subunit combinations that exist in vivo and the significance of these specific combinations are largely unknown. We have begun to approach these problems in HeLa cells by: 1) determining the concentrations of Galpha and Gbeta subunits; 2) examining receptor-dependent activities of two effector systems (adenylyl cyclase and phospholipase Cbeta); and 3) systematically silencing each of the Galpha and Gbeta subunits by using small interfering RNA while quantifying resultant changes in effector function and the concentrations of other relevant proteins in the network. HeLa cells express equimolar amounts of total Galpha and Gbeta subunits. The most prevalent Galpha proteins were one member of each Galpha subfamily (Galpha(s), Galpha(i3), Galpha(11), and Galpha(13)). We substantially abrogated expression of most of the Galpha and Gbeta proteins expressed in these cells, singly and some in combinations. As expected, agonist-dependent activation of adenylyl cyclase or phospholipase Cbeta was specifically eliminated following the silencing of Galpha(s) or Galpha(q/11), respectively. We also confirmed that Gbeta subunits are necessary for stable accumulation of Galpha proteins in vivo. Gbeta subunits demonstrated little isoform specificity for receptor-dependent modulation of effector activity. We observed compensatory changes in G protein accumulation following silencing of individual genes, as well as an apparent reciprocal relationship between the expression of certain Galpha(q) and Galpha(i) subfamily members. These findings provide a foundation for understanding the mechanisms that regulate the adaptability and remarkable resilience of G protein signaling networks.
Collapse
Affiliation(s)
- Andrejs M Krumins
- Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | | |
Collapse
|
38
|
Cao X, Qin J, Xie Y, Khan O, Dowd F, Scofield M, Lin MF, Tu Y. Regulator of G-protein signaling 2 (RGS2) inhibits androgen-independent activation of androgen receptor in prostate cancer cells. Oncogene 2006; 25:3719-34. [PMID: 16449965 DOI: 10.1038/sj.onc.1209408] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Hormones acting through G protein-coupled receptors (GPCRs) can cause androgen-independent activation of androgen receptor (AR) in prostate cancer cells. Regulators of G-protein signaling (RGS) proteins, through their GTPase activating protein (GAP) activities, inhibit GPCR-mediated signaling by inactivating G proteins. Here, we identified RGS2 as a gene specifically downregulated in androgen-independent prostate cancer cells. Expression of RGS2, but not other RGS proteins, abolished androgen-independent AR activity in androgen-independent LNCaP cells and CWR22Rv1 cells. In LNCaP cells, RGS2 inhibited G(q)-coupled GPCR signaling. Expression of exogenous wild-type RGS2, but not its GAP-deficient mutant, significantly reduced AR activation by constitutively activated G(q)Q209L mutant whereas silencing endogenous RGS2 by siRNA enhanced G(q)Q209L-stimulated AR activity. RGS2 had no effect on RGS-insensitive G(q)Q209L/G188S-induced AR activation. Furthermore, extracellular signal-regulated kinase 1/2 (ERK1/2) was found to be involved in RGS2-mediated regulation of androgen-independent AR activity. In addition, RGS2 functioned as a growth suppressor for androgen-independent LNCaP cells whereas androgen-sensitive LNCaP cells with RGS2 silencing had a growth advantage under steroid-reduced conditions. Finally, RGS2 expression level was significantly decreased in human prostate tumor specimens. Taken together, our results suggest RGS2 as a novel regulator of AR signaling and its repression may be an important step during prostate tumorigenesis and progression.
Collapse
Affiliation(s)
- X Cao
- Department of Pharmacology, Creighton University School of Medicine, Omaha, NE 68178, USA
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Labra A, Brann JH, Fadool DA. Heterogeneity of voltage- and chemosignal-activated response profiles in vomeronasal sensory neurons. J Neurophysiol 2005; 94:2535-48. [PMID: 15972830 PMCID: PMC2685031 DOI: 10.1152/jn.00490.2005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Liolaemus lizards were explored to ascertain whether they would make an amenable model to study single-cell electrophysiology of neurons in the vomeronasal organ (VNO). Despite a rich array of chemosensory-related behaviors chronicled for this genus, no anatomical or functional data exist for the VNO, the organ mediating these types of behaviors. Two Liolaemus species (L. bellii and L. nigroviridis) were collected in Central Chile in the Farellones Mountains and transported to the United States. Lizards were subjected to hypothermia and then a lethal injection of sodium pentabarbitol prior to all experiments described in the following text. Retrograde dye perfusion combined with histological techniques demonstrated a compartmentalization of the proportionally large VNO from the main olfactory epithelium (MOE) in cryosections of L. bellii. SDS-PAGE analysis of the VNO of both species demonstrated the expression of three G protein subunits, namely, G(alphao), G(alphai2), and G(beta), and the absence of G(alphaolf), G(alpha11), and G(q), the latter of which are traditionally found in the MOE. Vomeronasal (VN) neurons were enzymatically isolated for whole cell voltage-clamp electrophysiology of single neurons. Both species demonstrated a tetrodotoxin (TTX)-sensitive, rapidly inactivating sodium current and a tetraethylammonium (TEA)-sensitive potassium current that had a transient and sustained component. VN neurons were classified into two types dependent on the ratio of sodium over sustained potassium current. VN neurons exhibited outward and inward chemosignal-evoked currents when stimulated with pheromone-containing secretions taken from the feces, skin, and precloacal pores. Fifty-nine percent of the neurons were responsive to at least one compound when presented with a battery of five different secretions. The breadth of responsiveness (H metric) demonstrated a heterogeneous population of tuning with a mean of 0.29.
Collapse
Affiliation(s)
- Antonieta Labra
- Department of Biological Science, Programs in Neuroscience and Molecular Biophysics, Florida State University, Tallahassee, 32306, USA
| | | | | |
Collapse
|
40
|
Hecquet C, Biyashev D, Tan F, Erdös EG. Positive cooperativity between the thrombin and bradykinin B2 receptors enhances arachidonic acid release. Am J Physiol Heart Circ Physiol 2005; 290:H948-58. [PMID: 16183725 PMCID: PMC1656694 DOI: 10.1152/ajpheart.00868.2005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bradykinin (BK) or kallikreins activate B2 receptors (R) that couple Galpha(i) and Galpha(q) proteins to release arachidonic acid (AA) and elevate intracellular Ca2+ concentration ([Ca2+]i). Thrombin cleaves the protease-activated-receptor-1 (PAR1) that couples Galpha(i), Galpha(q), and Galpha(12/13) proteins. In Chinese hamster ovary cells stably transfected with human B2R, thrombin liberated little AA, but it significantly potentiated AA release by B2R agonists. We explored mechanisms of cooperativity between constitutively expressed PAR1 and B2R. We also examined human endothelial cells expressing both Rs constitutively. The PAR1 agonist hexapeptide (TRAP) was as effective as thrombin. Inhibitors of components of Galpha(i), Galpha(q), and Galpha(12/13) signaling pathways, and a protein kinase C (PKC)-alpha inhibitor, Gö-6976, blocked potentiation, while phorbol, an activator, enhanced it. Several inhibitors, including a RhoA kinase inhibitor, a [Ca2+]i antagonist, and an inositol-(1,3,4)-trisphosphate R antagonist, reduced mobilization of [Ca2+]i by thrombin and blocked potentiation of AA release by B2R agonists. Because either a nonselective inhibitor (isotetrandrine) of phospholipase A2 (PLA2) or a Ca2+-dependent PLA2 inhibitor abolished potentiation of AA release by thrombin, while a Ca2+-independent PLA2 inhibitor did not, we concluded that the mechanism involves Ca2+-dependent PLA2 activation. Both thrombin and TRAP modified activation and phosphorylation of the B2R induced by BK. In lower concentrations they enhanced it, while higher concentrations inhibited phosphorylation and diminished B2R activation. Protection of the NH2-terminal Ser1-Phe2 bond of TRAP by an aminopeptidase inhibitor made this peptide much more active than the unprotected agonist. Thus PAR1 activation enhances AA release by B2R agonists through signal transduction pathway.
Collapse
Affiliation(s)
| | | | - Fulong Tan
- Depts. of Pharmacology and
- Anesthesiology U. Illinois Coll. Med. at Chicago
| | - Ervin G. Erdös
- Depts. of Pharmacology and
- Anesthesiology U. Illinois Coll. Med. at Chicago
- Correspondence to: Ervin G. Erdös, MD, U. Illinois Coll. of Med. at Chicago, Dept of Pharmacology (M/C 868), 835 S. Wolcott Ave., Room E403, Chicago, IL 60612 USA, Telephone: (312) 996-9146, Fax: (312) 996-1648, E-MAIL:
| |
Collapse
|
41
|
Bruysters M, Jongejan A, Akdemir A, Bakker RA, Leurs R. A G(q/11)-coupled mutant histamine H(1) receptor F435A activated solely by synthetic ligands (RASSL). J Biol Chem 2005; 280:34741-6. [PMID: 16027157 DOI: 10.1074/jbc.m504165200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Recently, G protein-coupled receptors activated solely by synthetic ligands (RASSLs) have been introduced as new tools to study Galpha(i) signaling in vivo (1, 2). Also, Galpha(s)-coupled G protein-coupled receptors have been engineered to generate Galpha(s)-coupled RASSLs (3, 4). In this study, we exploited the differences in binding pockets between different classes of H(1) receptor agonists and identified the first Galpha(q/11)-coupled RASSL. The mutant human H(1) receptor F435A (6.55) combines a strongly decreased affinity (25-fold) and potency for the endogenous ligand histamine (200-fold) with improved affinities (54-fold) and potencies (2600-fold) for 2-phenylhistamines, a synthetic class of H(1) receptor agonists. Molecular dynamics simulations provided a mechanism for distinct agonist binding to both wild-type and F435A mutant H(1) receptors.
Collapse
MESH Headings
- Animals
- COS Cells
- Cattle
- Chlorocebus aethiops
- Crystallography, X-Ray
- DNA, Complementary/metabolism
- Dose-Response Relationship, Drug
- GTP-Binding Protein alpha Subunits, Gq-G11/chemistry
- GTP-Binding Protein alpha Subunits, Gq-G11/genetics
- Genes, Reporter
- Histamine/chemistry
- Humans
- Hydrogen-Ion Concentration
- Ligands
- Models, Chemical
- Models, Molecular
- Mutagenesis, Site-Directed
- Mutation
- NF-kappa B/metabolism
- Phenylalanine/chemistry
- Protein Binding
- Protein Engineering
- Receptors, Histamine H1/chemistry
- Receptors, Histamine H1/genetics
- Receptors, Opioid, kappa/chemistry
- Transfection
Collapse
Affiliation(s)
- Martijn Bruysters
- Leiden/Amsterdam Center for Drug Research, Faculty of Sciences, Department of Medicinal Chemistry, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | | | | | | | | |
Collapse
|
42
|
Jongejan A, Leurs R. Delineation of Receptor-Ligand Interactions at the Human Histamine H1 Receptor by a Combined Approach of Site-Directed Mutagenesis and Computational Techniques - or - How to Bind the H1 Receptor. Arch Pharm (Weinheim) 2005; 338:248-59. [PMID: 15952243 DOI: 10.1002/ardp.200400998] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Histamine H(1) antagonists or "antihistamines" are one of the most prescribed drug families in Western countries. They exert their effect by binding to the histamine H(1) receptor, a receptor belonging to the class of rhodopsin-like G protein-coupled receptors (GPCRs). In this review, the binding of ligands to the human histamine H(1) receptor with respect to site-directed mutagenesis studies and molecular modeling techniques is described. The ligands described include agonists (histamine and histaprodifens), a stereoselective partial agonist (lisuride), and selected inverse agonists (mepyramine, acrivastine and triprolidine).
Collapse
Affiliation(s)
- Aldo Jongejan
- Leiden/Amsterdam Center for Drug Research, Division of Medicinal Chemistry, Faculty of Science, Vrije Universiteit Amsterdam, The Netherlands
| | | |
Collapse
|
43
|
Leeb-Lundberg LMF, Marceau F, Müller-Esterl W, Pettibone DJ, Zuraw BL. International union of pharmacology. XLV. Classification of the kinin receptor family: from molecular mechanisms to pathophysiological consequences. Pharmacol Rev 2005; 57:27-77. [PMID: 15734727 DOI: 10.1124/pr.57.1.2] [Citation(s) in RCA: 723] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Kinins are proinflammatory peptides that mediate numerous vascular and pain responses to tissue injury. Two pharmacologically distinct kinin receptor subtypes have been identified and characterized for these peptides, which are named B1 and B2 and belong to the rhodopsin family of G protein-coupled receptors. The B2 receptor mediates the action of bradykinin (BK) and lysyl-bradykinin (Lys-BK), the first set of bioactive kinins formed in response to injury from kininogen precursors through the actions of plasma and tissue kallikreins, whereas the B(1) receptor mediates the action of des-Arg9-BK and Lys-des-Arg9-BK, the second set of bioactive kinins formed through the actions of carboxypeptidases on BK and Lys-BK, respectively. The B2 receptor is ubiquitous and constitutively expressed, whereas the B1 receptor is expressed at a very low level in healthy tissues but induced following injury by various proinflammatory cytokines such as interleukin-1beta. Both receptors act through G alpha(q) to stimulate phospholipase C beta followed by phosphoinositide hydrolysis and intracellular free Ca2+ mobilization and through G alpha(i) to inhibit adenylate cyclase and stimulate the mitogen-activated protein kinase pathways. The use of mice lacking each receptor gene and various specific peptidic and nonpeptidic antagonists have implicated both B1 and B2 receptors as potential therapeutic targets in several pathophysiological events related to inflammation such as pain, sepsis, allergic asthma, rhinitis, and edema, as well as diabetes and cancer. This review is a comprehensive presentation of our current understanding of these receptors in terms of molecular and cell biology, physiology, pharmacology, and involvement in human disease and drug development.
Collapse
Affiliation(s)
- L M Fredrik Leeb-Lundberg
- Division of Cellular and Molecular Pharmacology, Department of Experimental Medical Science, Lund University, BMC, A12, SE-22184 Lund, Sweden.
| | | | | | | | | |
Collapse
|
44
|
Filtz TM, Niibori Y. Desensitization of angiotensin-stimulated inositol phosphate accumulation in human vascular smooth muscle cells. Eur J Pharmacol 2005; 502:11-9. [PMID: 15464085 DOI: 10.1016/j.ejphar.2004.08.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2004] [Revised: 08/09/2004] [Accepted: 08/18/2004] [Indexed: 10/26/2022]
Abstract
The effect of angiotensin II treatment on desensitization of phospholipase C (PLC)-mediated inositol phosphate accumulation has not been quantitated in human aortic vascular smooth muscle (HVSM) cells. We determined the angiotensin II pretreatment dose dependency and time course for desensitization of PLC activation in HVSM cells and the effect of protein kinase C (PKC) activators on angiotensin II-mediated inositol phosphate accumulation. Our results with PKC activators and direct G protein stimulators suggest that PKC activation may play a negative feedback role in desensitization of angiotensin II-activated signaling in HVSM cells by modifying the Gq transducer, PLC-beta effector, or related proteins in the signaling pathway. However, neither angiotensin II nor PKC activator affected basal phosphorylation levels of PLC-beta1 or PLC-beta3 in HVSM cells; PLC-beta isoenzymes were shown to be phosphorylated in unstimulated cells independent of PKC inhibition. We suggest that desensitization of G protein-stimulated inositol phosphate accumulation in HVSM differs from other cell types in which phosphorylation of PLC-beta isoenzymes accompanies desensitization.
Collapse
Affiliation(s)
- Theresa M Filtz
- Department of Pharmaceutical Sciences, College of Pharmacy, 203 Pharmacy Building, Oregon State University, Corvallis, OR 97331, USA.
| | | |
Collapse
|
45
|
Faussner A, Bauer A, Kalatskaya I, Schüssler S, Seidl C, Proud D, Jochum M. The role of helix 8 and of the cytosolic C-termini in the internalization and signal transduction of B(1) and B(2) bradykinin receptors. FEBS J 2005; 272:129-40. [PMID: 15634338 DOI: 10.1111/j.1432-1033.2004.04390.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Determinants for desensitization and sequestration of G protein-coupled receptors often contain serine or threonine residues located in their C-termini. The sequence context, however, in which these residues have to appear, and the receptor specificity of these motifs are largely unknown. Mutagenesis studies with the B(2) bradykinin receptor (B(2)wt), stably expressed in HEK 293 cells, identified a sequence distal to N338 (NSMGTLRTSI, including I347 but not the basally phosphorylated S348) and in particular the TSI sequence therein, as a major determinant for rapid agonist-inducible internalization and the prevention of receptor hypersensitivity. Chimeras of the noninternalizing B(1) bradykinin receptor (B(1)wt) containing these B(2)wt sequences sequestered poorly, however, suggesting that additional motifs more proximal to N338 are required. In fact, further substitution of the B(1)wt C-terminus with corresponding B(2)wt regions either at C330(7.71) following putative helix 8 (B(1)CB(2)) or at the preceding Y312(7.53) in the NPXXY sequence (B(1)YB(2)) resulted in chimeras displaying rapid internalization. Intriguingly, however, exchange performed at K322(7.63) within putative helix 8 generated a slowly internalizing chimera (B(1)KB(2)). Detailed mutagenesis analysis generating additional chimeras identified the change of V323 in B(1)wt to serine (as in B(2)wt) as being responsible for this effect. The slowly internalizing chimera as well as a B(1)wt point-mutant V323S displayed significantly reduced inositol phosphate accumulation as compared to B(1)wt or the other chimeras. The slow internalization of B(1)KB(2) was also accompanied by a lack of agonist-induced phosphorylation, that in contrast was observed for B(1)YB(2) and B(1)CB(2), suggesting that putative helix 8 is either directly or indirectly (e.g. via G protein activation) involved in the interaction between the receptor and receptor kinases.
Collapse
Affiliation(s)
- Alexander Faussner
- Ludwig-Maximilians-Universität, Abteilung für Klinische Chemie und Klinische Biochemie, München, Germany.
| | | | | | | | | | | | | |
Collapse
|
46
|
Spät A, Hunyady L. Control of aldosterone secretion: a model for convergence in cellular signaling pathways. Physiol Rev 2004; 84:489-539. [PMID: 15044681 DOI: 10.1152/physrev.00030.2003] [Citation(s) in RCA: 344] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Aldosterone secretion by glomerulosa cells is stimulated by angiotensin II (ANG II), extracellular K(+), corticotrophin, and several paracrine factors. Electrophysiological, fluorimetric, and molecular biological techniques have significantly clarified the molecular action of these stimuli. The steroidogenic effect of corticotrophin is mediated by adenylyl cyclase, whereas potassium activates voltage-operated Ca(2+) channels. ANG II, bound to AT(1) receptors, acts through the inositol 1,4,5-trisphosphate (IP(3))-Ca(2+)/calmodulin system. All three types of IP(3) receptors are coexpressed, rendering a complex control of Ca(2+) release possible. Ca(2+) release is followed by both capacitative and voltage-activated Ca(2+) influx. ANG II inhibits the background K(+) channel TASK and Na(+)-K(+)-ATPase, and the ensuing depolarization activates T-type (Ca(v)3.2) Ca(2+) channels. Activation of protein kinase C by diacylglycerol (DAG) inhibits aldosterone production, whereas the arachidonate released from DAG in ANG II-stimulated cells is converted by lipoxygenase to 12-hydroxyeicosatetraenoic acid, which may also induce Ca(2+) signaling. Feedback effects and cross-talk of signal-transducing pathways sensitize glomerulosa cells to low-intensity stimuli, such as physiological elevations of [K(+)] (< or =1 mM), ANG II, and ACTH. Ca(2+) signaling is also modified by cell swelling, as well as receptor desensitization, resensitization, and downregulation. Long-term regulation of glomerulosa cells involves cell growth and proliferation and induction of steroidogenic enzymes. Ca(2+), receptor, and nonreceptor tyrosine kinases and mitogen-activated kinases participate in these processes. Ca(2+)- and cAMP-dependent phosphorylation induce the transfer of the steroid precursor cholesterol from the cytoplasm to the inner mitochondrial membrane. Ca(2+) signaling, transferred into the mitochondria, stimulates the reduction of pyridine nucleotides.
Collapse
Affiliation(s)
- András Spät
- Dept. of Physiology, Semmelweis University, Faculty of Medicine, PO Box 259, H-1444 Budapest, Hungary.
| | | |
Collapse
|
47
|
Bakker RA, Weiner DM, ter Laak T, Beuming T, Zuiderveld OP, Edelbroek M, Hacksell U, Timmerman H, Brann MR, Leurs R. 8R-Lisuride Is a Potent Stereospecific Histamine H1-Receptor Partial Agonist. Mol Pharmacol 2004; 65:538-49. [PMID: 14978232 DOI: 10.1124/mol.65.3.538] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The human histamine H1 receptor (H1R) is an important, well characterized target for the development of antagonists to treat allergic conditions. Many neuropsychiatric drugs are known to potently antagonize the H1R, thereby producing some of their side effects. In contrast, the tolerability and potential therapeutic utility of H1R agonism is currently unclear. We have used a cell-based functional assay to evaluate known therapeutics and reference drugs for H1R agonist activity. Our initial functional screen identified three ergot-based compounds possessing heretofore-unknown H1R agonist activity. 8R-lisuride demonstrated potent agonist activity in various assays including receptor selection and amplification technology, inositol phosphate accumulation, and activation of nuclear factor-kappaB with pEC50 values of 8.1, 7.9, and 7.9, respectively, and with varying degrees of efficacy. Based on these assays, 8R-lisuride is the most potent stereospecific partial agonist for the human H1R yet reported. Investigation of the residues involved in histamine and lisuride binding, using H1R mutants and molecular modeling, have revealed that although these ligands are structurally different, the lisuride-binding pocket in the H1R closely corresponds to the histamine-binding pocket. The discovery of a potent stereospecific partial H1R agonist provides a valuable tool to further characterize this important therapeutic target in vitro.
Collapse
Affiliation(s)
- R A Bakker
- Leiden/Amsterdam Center for Drug Research, Department of Medicinal Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Hecquet C, Becker RP, Tan F, Erdös EG. Kallikreins when activating bradykinin B2 receptor induce its redistribution on plasma membrane. Int Immunopharmacol 2002; 2:1795-806. [PMID: 12489794 DOI: 10.1016/s1567-5769(02)00176-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The bradykinin (BK) B2 receptor (R) is directly activated by kallikreins and other serine proteases independent of BK release. Both the Galpha(i) and Galpha(q) proteins are involved, shown by the release of arachidonic acid and [Ca2+]i elevation. Site-directed mutagenesis of the receptor and the lack of heterogeneous desensitization of the human B2R by the BK and kallikrein emphasize among others the differences between activation by the proteases and the peptide. To characterize further the mechanism thereby kallikreins activate and desensitize the B2R we investigated the distribution of the human B2R tagged with the green fluorescent protein (B2-GFP(Ct)) on the plasma membrane of stably transfected Chinese hamster ovary (CHO) cells. We visualized the movement of B2-GFP(Ct) R with confocal fluorescence microscopy after activation by BK or a by serine protease. Continued exposure of the cells to BK led to B2R internalization within 15-20 min. Porcine pancreatic and human recombinant tissue kallikreins induced a rapid definite redistribution of receptors on the plasma membrane within 5 min, prior to internalization. These effects of kallikrein were blocked by the B2R antagonist HOE 140 and by the kallikrein inhibitor, aprotinin. The B2R was also activated by endoproteinases LysC and ArgC and trypsin, but these enzymes did not induce redistribution, only internalization. In control experiments, kallikrein had no effect on cells transfected to stably express the angiotensin-converting enzyme-green fluorescent protein (GFP). Thus, kallikreins when activating the BK B2R also trigger its redistribution on plasma membrane.
Collapse
Affiliation(s)
- Claudie Hecquet
- Department of Pharmacology, University of Illinois College of Medicine at Chicago, Chicago, IL 60612, USA
| | | | | | | |
Collapse
|
49
|
An JY, Yun HS, Lee YP, Yang SJ, Shim JO, Jeong JH, Shin CY, Kim JH, Kim DS, Sohn UD. The intracellular pathway of the acetylcholine-induced contraction in cat detrusor muscle cells. Br J Pharmacol 2002; 137:1001-10. [PMID: 12429572 PMCID: PMC1573577 DOI: 10.1038/sj.bjp.0704954] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
1. The present study was aimed to investigate intracellular pathways involved in acetylcholine (ACh)-induced contraction in cat detrusor muscle cells 2. Contraction was expressed as per cent shortening of length of individually isolated smooth muscle cells obtained by enzymatic digestion. Dispersed intact and permeabilized cells were prepared for the treatment of drugs and antibody to enzymes, respectively. Using Western blot, we confirmed the presence of related proteins. 3. The maximal contraction to ACh was generated at 10(-11) M. This response was preferentially antagonized by M3 muscarinic receptor antagonist rho-fluoro-hexahydrosiladifenidol (rhoF-HSD) but not by the M1 antagonist pirenzepine and the M2 muscarinic receptor antagonist methoctramine. We identified G-proteins (Gq/11), (Gs), (G0), (Gi1), (Gi2) and (Gi3) in the bladder detrusor muscle. ACh-induced contraction was selectively inhibited by (Gq/11) antibody but not to other G subunit. 4. The phosphatidylinositol-specific phospholipase C (PI-PLC) inhibitor neomycin reduced ACh-induced contraction. However, the inhibitors of the phospholipase D, the phospholipase A2 and protein kinase C did not attenuate the ACh-induced contraction. ACh-induced contraction was inhibited by antibody to PLC-beta1 but not PLC-beta3 and PLC-gamma. Thapsigargin or strontium, which depletes or blocks intracellular calcium release, inhibited ACh-induced contraction. Inositol 1,4,5-triphosphate IP3 receptor inhibitor heparin reduced ACh-induced contraction. 5. These results suggest that in cat detrusor muscle contraction induced by ACh is mediated via M3 muscarinic receptor-dependent activation of Gq/11 and PLC-beta1 and IP3-dependent Ca(2+) release.
Collapse
Affiliation(s)
- J Y An
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - H S Yun
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - Y P Lee
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - S J Yang
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - J O Shim
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - J H Jeong
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - C Y Shin
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - J H Kim
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - D S Kim
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
| | - U D Sohn
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul, 156-756, Republic of Korea
- Author for correspondence:
| |
Collapse
|
50
|
McLaughlin JN, Thulin CD, Bray SM, Martin MM, Elton TS, Willardson BM. Regulation of angiotensin II-induced G protein signaling by phosducin-like protein. J Biol Chem 2002; 277:34885-95. [PMID: 12107186 DOI: 10.1074/jbc.m205583200] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Phosducin-like protein (PhLP) is a broadly expressed member of the phosducin (Pd) family of G protein betagamma subunit (Gbetagamma)-binding proteins. Though PhLP has been shown to bind Gbetagamma in vitro, little is known about its physiological function. In the present study, the effect of PhLP on angiotensin II (Ang II) signaling was measured in Chinese hamster ovary cells expressing the type 1 Ang II receptor and various amounts of PhLP. Up to 3.6-fold overexpression of PhLP had no effect on Ang II-stimulated inositol trisphosphate (IP(3)) formation, whereas further increases caused an abrupt decrease in IP(3) production with half-maximal inhibition occurring at 6-fold PhLP overexpression. This threshold level for inhibition corresponds to the cellular concentration of cytosolic chaperonin complex, a recently described binding partner that preferentially binds PhLP over Gbetagamma. Results of pertussis toxin sensitivity, GTPgammaS binding, and immunoprecipitation experiments suggest that PhLP inhibits phospholipase Cbeta activation by dual mechanisms: (i) steric blockage of Gbetagamma activation of PLCbeta and (ii) interference with Gbetagamma-dependent cycling of G(q)alpha by the receptor. These results suggest that G protein signaling may be regulated through controlling the cellular concentration of free PhLP by inducing its expression or by regulating its binding to the chaperonin.
Collapse
Affiliation(s)
- Joseph N McLaughlin
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA
| | | | | | | | | | | |
Collapse
|