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Somalo-Barranco G, Pagano Zottola AC, Abdulrahman AO, El Zein RM, Cannich A, Muñoz L, Serra C, Oishi A, Marsicano G, Masri B, Bellocchio L, Llebaria A, Jockers R. Mitochondria-targeted melatonin photorelease supports the presence of melatonin MT1 receptors in mitochondria inhibiting respiration. Cell Chem Biol 2023; 30:920-932.e7. [PMID: 37572668 DOI: 10.1016/j.chembiol.2023.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 04/16/2023] [Accepted: 07/20/2023] [Indexed: 08/14/2023]
Abstract
The presence of signaling-competent G protein-coupled receptors in intracellular compartments is increasingly recognized. Recently, the presence of Gi/o protein-coupled melatonin MT1 receptors in mitochondria has been revealed, in addition to the plasma membrane. Melatonin is highly cell permeant, activating plasma membrane and mitochondrial receptors equally. Here, we present MCS-1145, a melatonin derivative bearing a triphenylphosphonium cation for specific mitochondrial targeting and a photocleavable o-nitrobenzyl group releasing melatonin upon illumination. MCS-1145 displayed low affinity for MT1 and MT2 but spontaneously accumulated in mitochondria, where it was resistant to washout. Uncaged MCS-1145 and exogenous melatonin recruited β-arrestin 2 to MT1 in mitochondria and inhibited oxygen consumption in mitochondria isolated from HEK293 cells only when expressing MT1 and from mouse cerebellum of WT mice but not from MT1-knockout mice. Overall, we developed the first mitochondria-targeted photoactivatable melatonin ligand and demonstrate that melatonin inhibits mitochondrial respiration through mitochondrial MT1 receptors.
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Affiliation(s)
- Gloria Somalo-Barranco
- Université Paris Cité, Institut Cochin, INSERM, CNRS, 75014 PARIS, France; MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain
| | | | | | - Rami M El Zein
- Université Paris Cité, Institut Cochin, INSERM, CNRS, 75014 PARIS, France
| | - Astrid Cannich
- INSERM, U1215 NeuroCentre Magendie, Endocannabinoids and Neuroadaptation, Bordeaux, France
| | - Lourdes Muñoz
- MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain; SIMChem, Synthesis of High Added Value Molecules, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain
| | - Carme Serra
- MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain; SIMChem, Synthesis of High Added Value Molecules, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain
| | - Atsuro Oishi
- Université Paris Cité, Institut Cochin, INSERM, CNRS, 75014 PARIS, France
| | - Giovanni Marsicano
- INSERM, U1215 NeuroCentre Magendie, Endocannabinoids and Neuroadaptation, Bordeaux, France
| | - Bernard Masri
- Université Paris Cité, Institut Cochin, INSERM, CNRS, 75014 PARIS, France
| | - Luigi Bellocchio
- INSERM, U1215 NeuroCentre Magendie, Endocannabinoids and Neuroadaptation, Bordeaux, France
| | - Amadeu Llebaria
- MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain.
| | - Ralf Jockers
- Université Paris Cité, Institut Cochin, INSERM, CNRS, 75014 PARIS, France.
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2
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Cecon E, Oishi A, Luka M, Ndiaye-Lobry D, François A, Lescuyer M, Panayi F, Dam J, Machado P, Jockers R. Novel repertoire of tau biosensors to monitor pathological tau transformation and seeding activity in living cells. eLife 2023; 12:78360. [PMID: 36917493 PMCID: PMC10014071 DOI: 10.7554/elife.78360] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 02/26/2023] [Indexed: 03/12/2023] Open
Abstract
Aggregates of the tau protein are a well-known hallmark of several neurodegenerative diseases, collectively referred to as tauopathies, including frontal temporal dementia and Alzheimer's disease (AD). Monitoring the transformation process of tau from physiological monomers into pathological oligomers or aggregates in a high-throughput, quantitative manner and in a cellular context is still a major challenge in the field. Identifying molecules able to interfere with those processes is of high therapeutic interest. Here, we developed a series of inter- and intramolecular tau biosensors based on the highly sensitive Nanoluciferase (Nluc) binary technology (NanoBiT) able to monitor the pathological conformational change and self-interaction of tau in living cells. Our repertoire of tau biosensors reliably reports i. molecular proximity of physiological full-length tau at microtubules; ii. changes in tau conformation and self-interaction associated with tau phosphorylation, as well as iii. tau interaction induced by seeds of recombinant tau or from mouse brain lysates of a mouse model of tau pathology. By comparing biosensors comprising different tau forms (i.e. full-length or short fragments, wild-type, or the disease-associated tau(P301L) variant) further insights into the tau transformation process are obtained. Proof-of-concept data for the high-throughput suitability and identification of molecules interfering with the pathological tau transformation processes are presented. This novel repertoire of tau biosensors is aimed to boost the disclosure of molecular mechanisms underlying pathological tau transformation in living cells and to discover new drug candidates for tau-related neurodegenerative diseases.
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Affiliation(s)
- Erika Cecon
- Institut Cochin, Inserm U1016, CNRS UMR 8104, Université de ParisParisFrance
| | - Atsuro Oishi
- Institut Cochin, Inserm U1016, CNRS UMR 8104, Université de ParisParisFrance
| | - Marine Luka
- Institut Cochin, Inserm U1016, CNRS UMR 8104, Université de ParisParisFrance
| | | | | | - Mathias Lescuyer
- Institut Cochin, Inserm U1016, CNRS UMR 8104, Université de ParisParisFrance
| | | | - Julie Dam
- Institut Cochin, Inserm U1016, CNRS UMR 8104, Université de ParisParisFrance
| | | | - Ralf Jockers
- Institut Cochin, Inserm U1016, CNRS UMR 8104, Université de ParisParisFrance
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3
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Amorim IS, Challal S, Cistarelli L, Dorval T, Abjean L, Touzard M, Arbez N, François A, Panayi F, Jeggo R, Cecon E, Oishi A, Dam J, Jockers R, Machado P. A seeding-based neuronal model of tau aggregation for use in drug discovery. PLoS One 2023; 18:e0283941. [PMID: 37014877 PMCID: PMC10072482 DOI: 10.1371/journal.pone.0283941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 03/21/2023] [Indexed: 04/05/2023] Open
Abstract
Intracellular accumulation of tau protein is a hallmark of Alzheimer's Disease and Progressive Supranuclear Palsy, as well as other neurodegenerative disorders collectively known as tauopathies. Despite our increasing understanding of the mechanisms leading to the initiation and progression of tau pathology, the field still lacks appropriate disease models to facilitate drug discovery. Here, we established a novel and modulatable seeding-based neuronal model of full-length 4R tau accumulation using humanized mouse cortical neurons and seeds from P301S human tau transgenic animals. The model shows specific and consistent formation of intraneuronal insoluble full-length 4R tau inclusions, which are positive for known markers of tau pathology (AT8, PHF-1, MC-1), and creates seeding competent tau. The formation of new inclusions can be prevented by treatment with tau siRNA, providing a robust internal control for use in qualifying the assessment of potential therapeutic candidates aimed at reducing the intracellular pool of tau. In addition, the experimental set up and data analysis techniques used provide consistent results in larger-scale designs that required multiple rounds of independent experiments, making this is a versatile and valuable cellular model for fundamental and early pre-clinical research of tau-targeted therapies.
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Affiliation(s)
- Ines S Amorim
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Sylvie Challal
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | | | - Thierry Dorval
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Laurene Abjean
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Manuelle Touzard
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Nicolas Arbez
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Arnaud François
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Fany Panayi
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Ross Jeggo
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
| | - Erika Cecon
- INSERM, CNRS, Institut Cochin, Université Paris Cité, Paris, France
| | - Atsuro Oishi
- INSERM, CNRS, Institut Cochin, Université Paris Cité, Paris, France
| | - Julie Dam
- INSERM, CNRS, Institut Cochin, Université Paris Cité, Paris, France
| | - Ralf Jockers
- INSERM, CNRS, Institut Cochin, Université Paris Cité, Paris, France
| | - Patricia Machado
- SERVIER, Institut de Recherches Servier, Croissy-sur-Seine, France
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Abstract
The melatonin receptor subfamily belongs to the G protein-coupled receptor superfamily and consists of three members in mammals, MT1, MT2, and GPR50. These receptors can interact with each other to form homo- and heterodimers that are part of larger molecular complexes composed of G proteins, β-arrestins, and other membrane and cytosolic proteins. BRET (bioluminescence resonance energy transfer) is a versatile technique to follow protein-protein interactions on the nanometer scale, in real time, in living cells, which contributed largely to our understanding of the function of melatonin receptors. In this chapter, we describe our BRET protocols for melatonin receptors, which can also be applied to other GPCRs.
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Affiliation(s)
- Atsuro Oishi
- Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France
- Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan
- Cancer RNA Research Unit, National Cancer Center Research Institute, Tokyo, Japan
| | - Ralf Jockers
- Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France.
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5
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Lucey M, Ashik T, Marzook A, Wang Y, Goulding J, Oishi A, Broichhagen J, Hodson DJ, Minnion J, Elani Y, Jockers R, Briddon SJ, Bloom SR, Tomas A, Jones B. Acylation of the Incretin Peptide Exendin-4 Directly Impacts Glucagon-Like Peptide-1 Receptor Signaling and Trafficking. Mol Pharmacol 2021; 100:319-334. [PMID: 34315812 PMCID: PMC8626645 DOI: 10.1124/molpharm.121.000270] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 07/14/2021] [Indexed: 11/22/2022] Open
Abstract
The glucagon-like peptide-1 receptor (GLP-1R) is a class B G protein-coupled receptor and mainstay therapeutic target for the treatment of type 2 diabetes and obesity. Recent reports have highlighted how biased agonism at the GLP-1R affects sustained glucose-stimulated insulin secretion through avoidance of desensitization and downregulation. A number of GLP-1R agonists (GLP-1RAs) feature a fatty acid moiety to prolong their pharmacokinetics via increased albumin binding, but the potential for these chemical changes to influence GLP-1R function has rarely been investigated beyond potency assessments for cAMP. Here, we directly compare the prototypical GLP-1RA exendin-4 with its C-terminally acylated analog, exendin-4-C16. We examine relative propensities of each ligand to recruit and activate G proteins and β-arrestins, endocytic and postendocytic trafficking profiles, and interactions with model and cellular membranes in HEK293 and HEK293T cells. Both ligands had similar cAMP potency, but exendin-4-C16 showed ∼2.5-fold bias toward G protein recruitment and a ∼60% reduction in β-arrestin-2 recruitment efficacy compared with exendin-4, as well as reduced GLP-1R endocytosis and preferential targeting toward recycling pathways. These effects were associated with reduced movement of the GLP-1R extracellular domain measured using a conformational biosensor approach and a ∼70% increase in insulin secretion in INS-1 832/3 cells. Interactions with plasma membrane lipids were enhanced by the acyl chain. Exendin-4-C16 showed extensive albumin binding and was highly effective for lowering of blood glucose in mice over at least 72 hours. Our study highlights the importance of a broad approach to the evaluation of GLP-1RA pharmacology. SIGNIFICANCE STATEMENT: Acylation is a common strategy to enhance the pharmacokinetics of peptide-based drugs. This work shows how acylation can also affect various other pharmacological parameters, including biased agonism, receptor trafficking, and interactions with the plasma membrane, which may be therapeutically important.
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Affiliation(s)
- Maria Lucey
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Tanyel Ashik
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Amaara Marzook
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Yifan Wang
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Joëlle Goulding
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Atsuro Oishi
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Johannes Broichhagen
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - David J Hodson
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - James Minnion
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Yuval Elani
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Ralf Jockers
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Stephen J Briddon
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Stephen R Bloom
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Alejandra Tomas
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
| | - Ben Jones
- Section of Endocrinology and Investigative Medicine (M.L., T.A., A.M., J.M., S.R.B., B.J.) and Section of Cell Biology and Functional Genomics (Y.W., A.T.), Department of Metabolism, Digestion and Reproduction, and Department of Chemical Engineering (Y.E.), Imperial College London, London, United Kingdom; Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom (J.G., S.J.B.); Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands, United Kingdom (J.G., D.J.H., S.J.B.); Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France (A.O., R.J.); Department of Anatomy, Kyorin University Faculty of Medicine, Tokyo, Japan (A.O.); Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany (J.B.); Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Birmingham, United Kingdom (D.J.H.); and Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom (D.J.H.)
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6
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Abstract
In mammals, including humans, the neurohormone melatonin is mainly secreted from the pineal gland at night and acts on two high-affinity G protein-coupled receptors, the melatonin MT1 and MT2 receptors. Major functions of melatonin receptors in the brain are the regulation of circadian rhythms and sleep. Correspondingly, the main indications of the currently available drugs for these receptors indicate this as targets. Yet these drugs may not only improve circadian rhythm- and sleep-related disorders but may also be beneficial for complex diseases like major depression, Alzheimer's disease, autism, and attention-deficit/hyperactivity disorders. Here, we will focus on the hypothalamic functions of melatonin receptors by updating our knowledge on their hypothalamic expression pattern at normal, aged, and disease states, by discussing their capacity to regulate circadian rhythms and sleep and by presenting the clinical applications of the melatonin receptor-targeting drugs ramelteon, tasimelteon, and agomelatine or of prolonged-release melatonin formulations. Finally, we speculate about future trends in the field of melatonin receptor drugs.
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Affiliation(s)
- Atsuro Oishi
- Institut Cochin, Université de Paris, Paris, France
| | | | - Ralf Jockers
- Institut Cochin, Université de Paris, Paris, France.
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7
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Jones B, McGlone ER, Fang Z, Pickford P, Corrêa IR, Oishi A, Jockers R, Inoue A, Kumar S, Görlitz F, Dunsby C, French PMW, Rutter GA, Tan T, Tomas A, Bloom SR. Genetic and biased agonist-mediated reductions in β-arrestin recruitment prolong cAMP signaling at glucagon family receptors. J Biol Chem 2020; 296:100133. [PMID: 33268378 PMCID: PMC7948418 DOI: 10.1074/jbc.ra120.016334] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/29/2020] [Accepted: 12/01/2020] [Indexed: 01/20/2023] Open
Abstract
Receptors for the peptide hormones glucagon-like peptide-1 (GLP-1R), glucose-dependent insulinotropic polypeptide (GIPR), and glucagon (GCGR) are important regulators of insulin secretion and energy metabolism. GLP-1R agonists have been successfully deployed for the treatment of type 2 diabetes, but it has been suggested that their efficacy is limited by target receptor desensitization and downregulation due to recruitment of β-arrestins. Indeed, recently described GLP-1R agonists with reduced β-arrestin-2 recruitment have delivered promising results in preclinical and clinical studies. We therefore aimed to determine if the same phenomenon could apply to the closely related GIPR and GCGR. In HEK293 cells depleted of both β-arrestin isoforms the duration of G protein–dependent cAMP/PKA signaling was increased in response to the endogenous ligand for each receptor. Moreover, in wildtype cells, “biased” GLP-1, GCG, and GIP analogs with selective reductions in β-arrestin-2 recruitment led to reduced receptor endocytosis and increased insulin secretion over a prolonged stimulation period, although the latter effect was only seen at high agonist concentrations. Biased GCG analogs increased the duration of cAMP signaling, but this did not lead to increased glucose output from hepatocytes. Our study provides a rationale for the development of GLP-1R, GIPR, and GCGR agonists with reduced β-arrestin recruitment, but further work is needed to maximally exploit this strategy for therapeutic purposes.
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Affiliation(s)
- Ben Jones
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom.
| | - Emma Rose McGlone
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
| | - Zijian Fang
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
| | - Phil Pickford
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
| | | | - Atsuro Oishi
- Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France
| | - Ralf Jockers
- Université de Paris, Institut Cochin, INSERM, CNRS, Paris, France
| | - Asuka Inoue
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Sunil Kumar
- Department of Physics, Imperial College London, London, United Kingdom
| | - Frederik Görlitz
- Department of Physics, Imperial College London, London, United Kingdom
| | - Chris Dunsby
- Department of Physics, Imperial College London, London, United Kingdom
| | - Paul M W French
- Department of Physics, Imperial College London, London, United Kingdom
| | - Guy A Rutter
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
| | - Tricia Tan
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
| | - Alejandra Tomas
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom.
| | - Stephen R Bloom
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
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8
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Abstract
β-Arrestins are critical regulators of G protein-coupled receptors (GPCRs) that desensitize G protein signaling, promote receptor internalization, and initiate signaling on their own. Recent structural findings indicate that β-arrestins adopt different conformations upon interaction with agonist-activated GPCRs. Here, we established a β-arrestin-2 conformational bioluminescence resonance energy transfer (BRET) sensor composed of the bright Nanoluc BRET donor and the red-shifted CyOFP1 BRET acceptor. The sensor monitors early intramolecular conformational changes of β-arrestin-2 in complex with a wide panel of different class A and class B GPCRs upon agonist activation and with orphan GPCRs known to spontaneously recruit β-arrestin-2. The introduction of the R170E mutant in the β-arrestin-2 sensor allowed the detection of a partially active β-arrestin-2 conformation, which is not dependent on receptor phosphorylation, while the deletion of the β-arrestin-2 finger-loop region detected the "tail-conformation" corresponding to the interaction of β-arrestin with the carboxyl-terminal domain of GPCRs. The new sensors combine the advantages of the BRET technique in terms of sensitivity, robustness, and suitability for real-time measurements with a high responsiveness toward early conformational changes to help to elucidate the different conformational states of β-arrestins associated with GPCR activation in living cells.
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Affiliation(s)
- Atsuro Oishi
- Université de Paris, Institut Cochin, CNRS, INSERM, F-75014 Paris, France
| | - Julie Dam
- Université de Paris, Institut Cochin, CNRS, INSERM, F-75014 Paris, France
| | - Ralf Jockers
- Université de Paris, Institut Cochin, CNRS, INSERM, F-75014 Paris, France
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9
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Auriau J, Roujeau C, Belaid Choucair Z, Oishi A, Derviaux C, Roux T, Trinquet E, Hermine O, Jockers R, Dam J. Gain of affinity for VEGF165 binding within the VEGFR2/NRP1 cellular complex detected by an HTRF-based binding assay. Biochem Pharmacol 2018; 158:45-59. [PMID: 30236477 DOI: 10.1016/j.bcp.2018.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Accepted: 09/10/2018] [Indexed: 12/11/2022]
Abstract
Neuroplin 1 (NRP1), a transmembrane protein interacting with Vascular Endothelial Growth Factor VEGF-A165 (called here VEGF165) and the tyrosine kinase Receptor 2 (VEGFR2) promote angiogenesis and vascular homeostasis. In a pathophysiological context, several studies suggested that VEGFR2 and NRP1 mediate tumor development and progression. Given the involvement of the VEGF165 network in promoting tumor angiogenesis, NRP1, VEGFR2 and VEGF165 have been identified as targets for anti-angiogenic therapy. No binding assay exists to monitor specifically the binding of VEGF165 to the VEGFR2/NRP1 complex in intact cells. We established a binding assay based on the homogenous time-resolved fluorescence (HTRF®) technology. This unique binding assay enables to assess the interaction of VEGF165 with VEGFR2 or NRP1 within the VEGFR2/NRP1 complex. Ligand binding saturation experiments revealed that VEGF165 binds the VEGFR2/NRP1 complex at the cell surface with a ten to twenty-fold higher affinity compared to SNAP-VEGFR2 or SNAP-NRP1 receptors alone not engaged in the heteromeric complex. The assay allows characterizing the impact of NRP1 ligands on VEGF165 to the complex. It shows high specificity, reproducibility and robustness, making it compatible with high throughput screening (HTS) applications for identifying new VEGF165 antagonists selective for NRP1 or the VEGFR2/NRP1 complex.
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Affiliation(s)
- Johanna Auriau
- Institut Cochin, Inserm U1016, CNRS UMR 8104, University Paris Descartes, University Sorbonne Paris Cité, Paris, France
| | - Clara Roujeau
- Institut Cochin, Inserm U1016, CNRS UMR 8104, University Paris Descartes, University Sorbonne Paris Cité, Paris, France
| | - Zakia Belaid Choucair
- Hôpital Necker, CNRS UMR 8147, Université Paris Descartes, Université Sorbonne Paris Cité, Paris, France And THERANOVIR, Pépinière Genopole Entreprise, Evry, France
| | - Atsuro Oishi
- Institut Cochin, Inserm U1016, CNRS UMR 8104, University Paris Descartes, University Sorbonne Paris Cité, Paris, France
| | - Carine Derviaux
- Institut Cochin, Inserm U1016, CNRS UMR 8104, University Paris Descartes, University Sorbonne Paris Cité, Paris, France
| | - Thomas Roux
- Cisbio Bioassays, Parc Technologique Marcel Boiteux, BP84175, 30200 Codolet, France
| | - Eric Trinquet
- Cisbio Bioassays, Parc Technologique Marcel Boiteux, BP84175, 30200 Codolet, France
| | | | - Ralf Jockers
- Institut Cochin, Inserm U1016, CNRS UMR 8104, University Paris Descartes, University Sorbonne Paris Cité, Paris, France
| | - Julie Dam
- Institut Cochin, Inserm U1016, CNRS UMR 8104, University Paris Descartes, University Sorbonne Paris Cité, Paris, France.
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10
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Cecon E, Oishi A, Jockers R. Melatonin receptors: molecular pharmacology and signalling in the context of system bias. Br J Pharmacol 2018; 175:3263-3280. [PMID: 28707298 PMCID: PMC6057902 DOI: 10.1111/bph.13950] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 07/05/2017] [Accepted: 07/10/2017] [Indexed: 12/15/2022] Open
Abstract
Melatonin, N-acetyl-5-methoxytryptamine, an evolutionally old molecule, is produced by the pineal gland in vertebrates, and it binds with high affinity to melatonin receptors, which are members of the GPCR family. Among the multiple effects attributed to melatonin, we will focus here on those that are dependent on the activation of the two mammalian MT1 and MT2 melatonin receptors. We briefly summarize the latest developments on synthetic melatonin receptor ligands, including multi-target-directed ligands, and the characterization of signalling-biased ligands. We discuss signalling pathways activated by melatonin receptors that appear to be highly cell- and tissue-dependent, emphasizing the impact of system bias on the functional outcome. Different proteins have been demonstrated to interact with melatonin receptors, and thus, we postulate that part of this system bias has its molecular basis in differences of the expression of receptor-associated proteins including heterodimerization partners. Finally, bias at the level of the receptor, by the expression of genetic receptor variants, will be discussed to show how a modified receptor function can have an effect on the risk for common diseases like type 2 diabetes in humans. LINKED ARTICLES: This article is part of a themed section on Recent Developments in Research of Melatonin and its Potential Therapeutic Applications. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.16/issuetoc.
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Affiliation(s)
- Erika Cecon
- Institut CochinInserm, U1016ParisFrance
- CNRS UMR 8104ParisFrance
- Univ. Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Atsuro Oishi
- Institut CochinInserm, U1016ParisFrance
- CNRS UMR 8104ParisFrance
- Univ. Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Ralf Jockers
- Institut CochinInserm, U1016ParisFrance
- CNRS UMR 8104ParisFrance
- Univ. Paris Descartes, Sorbonne Paris CitéParisFrance
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11
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Oishi A, Cecon E, Jockers R. Melatonin Receptor Signaling: Impact of Receptor Oligomerization on Receptor Function. International Review of Cell and Molecular Biology 2018; 338:59-77. [DOI: 10.1016/bs.ircmb.2018.02.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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12
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Oishi A, Karamitri A, Gerbier R, Lahuna O, Ahmad R, Jockers R. Orphan GPR61, GPR62 and GPR135 receptors and the melatonin MT 2 receptor reciprocally modulate their signaling functions. Sci Rep 2017; 7:8990. [PMID: 28827538 PMCID: PMC5566548 DOI: 10.1038/s41598-017-08996-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 07/14/2017] [Indexed: 01/14/2023] Open
Abstract
Understanding the function of orphan G protein-coupled receptors (GPCRs), whose cognate ligand is unknown, is of major importance as GPCRs are privileged drug targets for many diseases. Recent phylogenetic studies classified three orphan receptors, GPR61, GPR62 and GPR135 among the melatonin receptor subfamily, but their capacity to bind melatonin and their biochemical functions are not well characterized yet. We show here that GPR61, GPR62 and GPR135 do not bind [3H]-melatonin nor 2-[125I]iodomelatonin and do not respond to melatonin in several signaling assays. In contrast, the three receptors show extensive spontaneous ligand-independent activities on the cAMP, inositol phosphate and ß-arrestin pathways with distinct pathway-specific profiles. Spontaneous ß-arrestin recruitment internalizes all three GPRs in the endosomal compartment. Co-expression of the melatonin binding MT2 receptor with GPR61, GPR62 or GPR135 has several consequences such as (i) the formation of receptor heteromers, (ii) the inhibition of melatonin-induced ß-arrestin2 recruitment to MT2 and (iii) the decrease of elevated cAMP levels upon melatonin stimulation in cells expressing spontaneously active GPR61 and GPR62. Collectively, these data show that GPR61, GPR62 and GPR135 are unable to bind melatonin, but show a reciprocal regulatory interaction with MT2 receptors.
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Affiliation(s)
- Atsuro Oishi
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR, 8104, Paris, France.,University Paris Descartes, Paris, France
| | - Angeliki Karamitri
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR, 8104, Paris, France.,University Paris Descartes, Paris, France
| | - Romain Gerbier
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR, 8104, Paris, France.,University Paris Descartes, Paris, France
| | - Olivier Lahuna
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR, 8104, Paris, France.,University Paris Descartes, Paris, France
| | - Raise Ahmad
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR, 8104, Paris, France.,University Paris Descartes, Paris, France
| | - Ralf Jockers
- Inserm, U1016, Institut Cochin, Paris, France. .,CNRS UMR, 8104, Paris, France. .,University Paris Descartes, Paris, France.
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13
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Sokolina K, Kittanakom S, Snider J, Kotlyar M, Maurice P, Gandía J, Benleulmi-Chaachoua A, Tadagaki K, Oishi A, Wong V, Malty RH, Deineko V, Aoki H, Amin S, Yao Z, Morató X, Otasek D, Kobayashi H, Menendez J, Auerbach D, Angers S, Pržulj N, Bouvier M, Babu M, Ciruela F, Jockers R, Jurisica I, Stagljar I. Systematic protein-protein interaction mapping for clinically relevant human GPCRs. Mol Syst Biol 2017; 13:918. [PMID: 28298427 PMCID: PMC5371730 DOI: 10.15252/msb.20167430] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
G‐protein‐coupled receptors (GPCRs) are the largest family of integral membrane receptors with key roles in regulating signaling pathways targeted by therapeutics, but are difficult to study using existing proteomics technologies due to their complex biochemical features. To obtain a global view of GPCR‐mediated signaling and to identify novel components of their pathways, we used a modified membrane yeast two‐hybrid (MYTH) approach and identified interacting partners for 48 selected full‐length human ligand‐unoccupied GPCRs in their native membrane environment. The resulting GPCR interactome connects 686 proteins by 987 unique interactions, including 299 membrane proteins involved in a diverse range of cellular functions. To demonstrate the biological relevance of the GPCR interactome, we validated novel interactions of the GPR37, serotonin 5‐HT4d, and adenosine ADORA2A receptors. Our data represent the first large‐scale interactome mapping for human GPCRs and provide a valuable resource for the analysis of signaling pathways involving this druggable family of integral membrane proteins.
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Affiliation(s)
- Kate Sokolina
- Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | | | - Jamie Snider
- Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Max Kotlyar
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Pascal Maurice
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR 8104, Paris, France.,Sorbonne Paris Cité, University of Paris Descartes, Paris, France.,UMR CNRS 7369 Matrice Extracellulaire et Dynamique Cellulaire (MEDyC), Université de Reims Champagne Ardenne (URCA), UFR Sciences Exactes et Naturelles, Reims, France
| | - Jorge Gandía
- Unitat de Farmacologia, Departament de Patologia i Terapèutica Experimental, Facultat de Medicina, IDIBELL, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain.,Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain
| | - Abla Benleulmi-Chaachoua
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR 8104, Paris, France.,Sorbonne Paris Cité, University of Paris Descartes, Paris, France
| | - Kenjiro Tadagaki
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR 8104, Paris, France.,Sorbonne Paris Cité, University of Paris Descartes, Paris, France
| | - Atsuro Oishi
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR 8104, Paris, France.,Sorbonne Paris Cité, University of Paris Descartes, Paris, France
| | - Victoria Wong
- Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Ramy H Malty
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK, Canada
| | - Viktor Deineko
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK, Canada
| | - Hiroyuki Aoki
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK, Canada
| | - Shahreen Amin
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK, Canada
| | - Zhong Yao
- Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Xavier Morató
- Unitat de Farmacologia, Departament de Patologia i Terapèutica Experimental, Facultat de Medicina, IDIBELL, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain.,Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain
| | - David Otasek
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Hiroyuki Kobayashi
- Department of Biochemistry, Institute for Research in Immunology & Cancer, Université de Montréal, Montréal, QC, Canada
| | | | | | - Stephane Angers
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy and Department of Biochemistry, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
| | - Natasa Pržulj
- Department of Computing, University College London, London, UK
| | - Michel Bouvier
- Department of Biochemistry, Institute for Research in Immunology & Cancer, Université de Montréal, Montréal, QC, Canada
| | - Mohan Babu
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK, Canada
| | - Francisco Ciruela
- Unitat de Farmacologia, Departament de Patologia i Terapèutica Experimental, Facultat de Medicina, IDIBELL, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain.,Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain
| | - Ralf Jockers
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS UMR 8104, Paris, France.,Sorbonne Paris Cité, University of Paris Descartes, Paris, France
| | - Igor Jurisica
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada.,Departments of Medical Biophysics and Computer Science, University of Toronto, Toronto, ON, Canada.,Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Igor Stagljar
- Donnelly Centre, University of Toronto, Toronto, ON, Canada .,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
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14
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Hata M, Oishi A, Tsujikawa A, Yamashiro K, Miyake M, Ooto S, Tamura H, Nakanishi H, Takahashi A, Yoshikawa M, Yoshimura N. Efficacy of Intravitreal Injection of Aflibercept in Neovascular Age-Related Macular Degeneration With or Without Choroidal Vascular Hyperpermeability. Invest Ophthalmol Vis Sci 2014; 55:7874-80. [DOI: 10.1167/iovs.14-14610] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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15
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16
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Maeda E, Murakami K, Etoh Y, Ichihara S, Oishi A, Hamasaki M, Horikawa K, Asoshima N, Honda M. P161 Antimicrobial resistance and lineage of Shiga toxin-producing Escherichia coli O91 isolates from humans in Fukuoka Prefecture, Japan. Int J Antimicrob Agents 2013. [DOI: 10.1016/s0924-8579(13)70404-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Oishi A, Ogino K, Nakagawa S, Makiyama Y, Kurimoto M, Otani A, Yoshimura N. Longitudinal analysis of the peripapillary retinal nerve fiber layer thinning in patients with retinitis pigmentosa. Eye (Lond) 2013; 27:597-604. [PMID: 23519274 DOI: 10.1038/eye.2013.34] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
PURPOSE To investigate longitudinal changes in peripapillary retinal nerve fiber layer (RNFL) thickness in patients with retinitis pigmentosa (RP). METHODS We re-examined 103 RP patients whose RNFL thickness was previously examined and reported. RNFL thickness was measured using Stratus optical coherence tomography and was compared with the previous measurements. The results were also compared with that of previously reported normal subjects. Association between the decrease rate and visual acuity, and visual field was also investigated. RESULTS The mean follow-up period was 56.9 months. After excluding the patients in whom RNFL images were of poor quality, 88 patients were eventually analyzed. The average RNFL thickness decreased from 105.8 to 98.2 μm during the period, with the average rate of decrease being 1.6 μm/year. The decrease in RNFL was more evident in superior and inferior sectors. Cross-sectional linear regression analysis also revealed an age-dependent decrease in RNFL, with the slower rate of decrease being 0.94 μm/year. The decrease in RNFL thickness was significantly faster than that reported in normal subjects. The decrease rate was not associated with visual functions. CONCLUSION Age-dependent RNFL thinning occurs at a faster rate in RP patients as compared with that in normal subjects. The result supports the notion that pathologic changes involve inner retina as well as outer retina in eyes with RP. Considering the discrepancy in the rate of RNFL thinning estimated from trend analysis and longitudinal measurement, care should be taken when interpreting the result of cross-sectional analysis.
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Affiliation(s)
- A Oishi
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan.
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18
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Abstract
RhoA plays a pivotal role in regulating cell shape and movement. Protein kinase A (PKA) inhibits RhoA signaling and thereby induces a characteristic morphological change, cell rounding. This has been considered to result from cAMP-induced phosphorylation of RhoA at Ser-188, which induces a stable RhoA-GTP-RhoGDIα complex and sequesters RhoA to the cytosol. However, few groups have shown RhoA phosphorylation in intact cells. Here we show that phosphorylation of RhoGDIα but not RhoA plays an essential role in the PKA-induced inhibition of RhoA signaling and in the morphological changes using cardiac fibroblasts. The knockdown of RhoGDIα by siRNA blocks cAMP-induced cell rounding, which is recovered by RhoGDIα-WT expression but not when a RhoGDIα-S174A mutant is expressed. PKA phosphorylates RhoGDIα at Ser-174 and the phosphorylation of RhoGDIα is likely to induce the formation of a active RhoA-RhoGDIα complex. Our present results thus reveal a principal molecular mechanism underlying G(s)/cAMP-induced cross-talk with G(q)/G(13)/RhoA signaling.
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Affiliation(s)
- Atsuro Oishi
- Department of Endocrinology and Nephrology, The University of Tokyo School of Medicine, Tokyo 113-8655, Japan
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Oishi A, Mandai M, Kimakura M, Nishida A, Kurimoto Y. Characteristics of fine vascular network pattern associated with recurrence of polypoidal choroidal vasculopathy. Eye (Lond) 2011; 25:1020-6. [PMID: 21546915 DOI: 10.1038/eye.2011.110] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
OBJECTIVE To characterize an irregular capillary-like structure in the vascular network of eyes with polypoidal choroidal vasculopathy (PCV), and to determine whether its presence after photodynamic therapy (PDT) can be used to predict the clinical course of PCV. METHODS We reviewed the clinical records of 29 eyes of 29 patients with PCV, who underwent PDT and confocal retinal angiographic examinations every 3 months. The images obtained before the PDT were compared with those after the PDT. The correlations between angiography findings and recurrences were evaluated. RESULTS An area of fine, densely packed capillary-like vessels, named the fine vascular network, was identified within the polypoidal vascular network in 25 of 29 cases at the initial examination. The fine vascular network regressed in 23 cases (92%) after the first PDT. Thereafter, the fine vascular network remained or enlarged in 19 eyes, and 17 (84.5%) of these eyes had a recurrence of the polypoidal lesions or had exudative changes. In contrast, recurrences were found in only 2 of 10 (20%) eyes, whose fine network had regressed without a subsequent enlargement (P<0.001 compared with the former group). CONCLUSIONS A fine irregular vascular network is present in the majority of eyes with PCV before PDT. Its presence or expansion after PDT was significantly associated with a recurrence of PCV. Thus, we recommend that this network be monitored after treatment to determine whether a polypoidal vascular network will recur.
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Affiliation(s)
- A Oishi
- Department of Ophthalmology, Kobe City Medical Center General Hospital, Kobe, Japan
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21
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Oishi A, Otani A, Sasahara M, Kojima H, Nakamura H, Kurimoto M, Yoshimura N. Photoreceptor integrity and visual acuity in cystoid macular oedema associated with retinitis pigmentosa. Eye (Lond) 2008; 23:1411-6. [PMID: 18724276 DOI: 10.1038/eye.2008.266] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
AIMS To assess the correlation between macular morphology and visual acuity in retinitis pigmentosa (RP) patients with cystoid macular oedema (CME). DESIGN Retrospective cross-sectional study. PATIENTS AND METHODS Forty-one eyes of 25 RP patients with CME. Patients underwent cross-sectional scans with optical coherence tomography (Stratus OCT). Age, total retinal thickness, photoreceptor thickness, and the transverse and vertical lengths of the cystoid space were measured. Correlation between visual acuity and each of the measurements were examined. Additionally, the status of the inner segment/outer segment junction (IS/OS) was classified as being absent, discontinuous, or distinct. Measurements were then compared among the three groups. RESULTS Total retinal thickness or photoreceptor thickness was not correlated with visual acuity. There was a correlation between the transverse length of the cystoid space and visual acuity, although the correlation coefficient was weak (r=0.30). The logMAR visual acuity in the IS/OS absent group (0.67+/-0.43) was worse than that seen in the IS/OS discontinuous (0.22+/-0.19) or IS/OS distinct groups (0.07+/-0.16) (P<0.001). CONCLUSIONS When monitoring CME associated with RP, the status of IS/OS is the essential parameter that needs to be examined.
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Affiliation(s)
- A Oishi
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
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Oishi A, Otani A, Sasahara M, Kurimoto M, Nakamura H, Kojima H, Yoshimura N. Retinal nerve fiber layer thickness in patients with retinitis pigmentosa. Eye (Lond) 2008; 23:561-6. [PMID: 18344951 DOI: 10.1038/eye.2008.63] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To study retinal nerve fiber layer (RNFL) thickness in patients with retinitis pigmentosa (RP). DESIGN Cross-sectional observational study. METHODS One hundred and thirty-seven eyes of 137 patients with RP were examined. The effect of age, gender, laterality, inheritance trait, spherical equivalent refractive error, visual acuity, and the extent of visual field defect on RNFL thickness measured with optical coherence tomography were analyzed by a multiple linear regression model. RESULTS The average RNFL thickness was 104.1+/-21.7 microm. The multiple R(2) for the model was 0.349. Among the variables studied, ageing and being male were significant risk factors for thinner RNFL thickness. RNFL thickness was not correlated with inheritance trait, laterality, refractive error, visual acuity, or the extent of visual field defect. CONCLUSION RNFL thickness in RP patients was not correlated with visual function but ageing as in the normal subjects. Currently proposed therapies, including photoreceptor rescue/transplantation and visual prosthesis, are based on the premise that the inner retinal structures are relatively retained despite the profound loss of photoreceptors. The present result supports this notion.
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Affiliation(s)
- A Oishi
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
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23
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Jin ZB, Mandai M, Yokota T, Higuchi K, Ohmori K, Ohtsuki F, Takakura S, Itabashi T, Wada Y, Akimoto M, Ooto S, Suzuki T, Hirami Y, Ikeda H, Kawagoe N, Oishi A, Ichiyama S, Takahashi M, Yoshimura N, Kosugi S. Identifying pathogenic genetic background of simplex or multiplex retinitis pigmentosa patients: a large scale mutation screening study. J Med Genet 2008; 45:465-72. [PMID: 18310263 DOI: 10.1136/jmg.2007.056416] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND AND PURPOSE More than half of the retinitis pigmentosa (RP) cases are genetically simplex or multiplex. To date, 37 causative genes of RP have been identified; however, the elucidation of gene defects in simplex or multiplex RP patients/families remains problematic. The aim of our study was to identify the genetic causes of RP in patients with unknown or non-Mendelian inheritance. METHODS AND RESULTS Since 2003, 52 simplex RP patients, 151 patients from 141 multiplex RP families, and six sporadic patients with retinal degeneration were studied. A total of 108 exons of 30 RP-causing genes that harboured the reported mutations were screened by an efficient denaturing high performance liquid chromatography (dHPLC) based assay. Aberrant fragments were subsequently analysed by automatic sequencing. Twenty-six mutations, including two frameshift mutations, one single amino acid deletion, and 23 missense mutations, were identified in 28 probands (14.07%). Eighteen mutations have not been reported to date. Three pairs of combined mutations in different genes were identified in two sporadic cases and one multiplex family, indicating the possibility of novel digenic patterns. Of the 23 missense mutations, 21 were predicted as deleterious mutations by computational methods using PolyPhen, SIFT, PANTHER, and PMut programs. CONCLUSION We elucidated the mutation spectrum in Japanese RP patients and demonstrated the validity of the mutation detection system using dHPLC sequencing for genetic diagnosis in RP patients independent of familial incidence, which may provide a model strategy for identifying genetic causes in other diseases linked to a wide range of genes.
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Abstract
OBJECTIVE We studied the effects of food components on the in vitro formation of calcium phosphate precipitates. MATERIALS AND METHODS The effects of food components, such as starch, soybean flour, fish meal, rapeseed oil, and coconut oil, on calcium phosphate precipitation were studied using a pH drop method. RESULTS Although the addition of starch had no effect on the rate of precipitation of amorphous calcium phosphate (ACP), it increased both the rate of transformation of ACP to hydroxyapatite (HAP) and the induction time (i.e. time for the initiation of transformation of ACP to HAP to occur); this was irrespective of the heat treatment of the starch. Amylopectin (insoluble constituent of starch) was effective in increasing the rate of HAP transformation, but amylose (soluble constituent of starch) was not. Oil specimen obtained from rapeseed (400 microl ml(-1)) increased the entire reaction of calcium phosphate precipitation, but that from coconut did not. Protein food, such as soybean flour and fish meal, decreased the rate of transformation of ACP to HAP and increased the induction time, while they had no effect on the rate of ACP precipitation. CONCLUSION These results suggest that carbohydrate and oil (both are staple diets for the humans) enhance oral calcification (dental calculus formation or re-mineralization of tooth enamel), while side dishes of protein food would decrease it.
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Affiliation(s)
- S Hidaka
- Department of Dental Hygiene, Fukuoka College of Health Sciences, Fukuoka, Japan.
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Makita N, Sato J, Manaka K, Shoji Y, Oishi A, Hashimoto M, Fujita T, Iiri T. An acquired hypocalciuric hypercalcemia autoantibody induces allosteric transition among active human Ca-sensing receptor conformations. Proc Natl Acad Sci U S A 2007; 104:5443-8. [PMID: 17372216 PMCID: PMC1838439 DOI: 10.1073/pnas.0701290104] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The seven-spanning calcium-sensing receptor (CaSR) activates multiple G proteins including Gq and Gi, and thereby activates a variety of second messengers and inhibits parathyroid hormone (PTH) secretion. However, the exact signaling mechanisms underlying the functional activity of CaSR are not yet fully understood. The heterozygous inactivation of CaSR or its inhibition by antibody blocking results in either familial hypocalciuric hypercalcemia or acquired hypocalciuric hypercalcemia (AHH), respectively. Here, we report the identification of a unique CaSR autoantibody in an AHH patient. Paradoxically, we find that this autoantibody potentiates the Ca(2+)/Gq-dependent accumulation of inositol phosphates by slightly shifting the dose dependence curve of the Ca(2+) mediated activation of phosphatidylinositol turnover to the left, whereas it inhibits the Ca(2+)/Gi-dependent phosphorylation of ERK1/2 in HEK293 cells stably expressing human CaSR. Treatment of these same cells with a calcimimetic, NPS-R-568, augments the CaSR response to Ca(2+), increasing phosphatidylinositol turnover and ERK1/2 phosphorylation, and overcoming the autoantibody effects. Our observations thus indicate that a calcium-stimulated CaSR primed by a specific autoantibody adopts a unique conformation that activates Gq but not Gi. Our findings also suggest that CaSR signaling may act via both Gq and Gi to inhibit PTH secretion. This is the first report of a disease-related autoantibody that functions as an allosteric modulator and maintains G protein-coupled receptors (GPCRs) in a unique active conformation with its agonist. We thus speculate that physiological modulators may exist that enable an agonist to specifically activate only one signaling pathway via a GPCR that activates multiple signaling pathways.
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Affiliation(s)
- Noriko Makita
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Junichiro Sato
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Katsunori Manaka
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Yuki Shoji
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Atsuro Oishi
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Makiko Hashimoto
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Toshiro Fujita
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Taroh Iiri
- Department of Endocrinology and Nephrology, University of Tokyo School of Medicine 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
- *To whom correspondence should be addressed. E-mail:
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Ibukuro K, Oishi A, Tanaka R, Fukuda H, Abe S. Signal Flare Phenomenon as Active Bleeding in Retroperitoneal Hematoma With Hematocrit Effect on Dynamic CT Scan. J Comput Assist Tomogr 2006; 30:787-90. [PMID: 16954929 DOI: 10.1097/01.rct.0000224632.32821.e6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The contrast medium was observed as a thin line indicating active bleeding in the cellular component and stayed at the boundary between the plasma and cellular components in liquefied hematomas. We could also reproduce the same phenomenon in an experimental study using human blood. The characteristic dynamic motion of the contrast medium demonstrated in the liquefied hematoma, which we have called the "signal flare" phenomenon, is a significant sign indicating active bleeding.
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Affiliation(s)
- Kenji Ibukuro
- Department of Radiology, Mitsui Memorial Hospital, 1-Kanda Izumicho Chiyoda-ku, Tokyo, Japan.
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Oishi A, Miyamoto K, Kashii S, Yoshimura N. Retinopathy is not the only ocular symptom: myasthenia gravis in association with interferon therapy. Br J Ophthalmol 2005; 89:1542-3. [PMID: 16234478 PMCID: PMC1772937 DOI: 10.1136/bjo.2005.077537] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Oishi A, Kira J. [Myoglobinuria]. Ryoikibetsu Shokogun Shirizu 2002:189-91. [PMID: 11555907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- A Oishi
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University
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29
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García-Martínez C, Taguchi Y, Oishi A, Hayamizu K. Crystal structure and preferred conformation of beta-lactams derived from (S)-1-arylethyl isocyanates and vinyl ethers. Enantiomer 2001; 5:281-7. [PMID: 11126868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The configurational analysis of beta-lactams prepared from [2 + 2] cycloaddition of vinyl ethers to pure enantiomers of 1-arylethyl isocyanates was carried out by high resolution 1H NMR. The addition of a chiral shift reagent revealed that the most important conformation of the studied beta-lactams in solution is that in which the methine proton, of the exocyclic stereogenic carbon, points towards the carbonyl oxygen atom. Since the configuration of the stereogenic exocyclic carbon is known, the orientation of the aromatic ring allows the correlation of the chemical shifts with the absolute configuration of the new stereogenic centers. This method is particularly useful to establish the stereochemistry of oily beta-lactams having the N-(1-arylethyl) group. The X-ray crystallographic analysis carried out with (1R,5S)-7-[(1S)-1-(1-naphthyl) ethyl]-2-oxa-7-azabicyclo[3.2.0]heptan-6-one, is consistent with the proposed model for beta-lactams in solution.
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Affiliation(s)
- C García-Martínez
- Departamento de Ciencias Básicas, Area de Química, Universidad Autónoma Metropolitana, Av. San Pablo #180, Col. Reynosa Tamaulipas, México 02200, D.F., México.
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Oishi A, Inagaki M, Sadamori H, Yagi T, Tanaka N. The effect of nitric oxide production by sinusoidal endothelial cells on preservation injury during cold ischemia. Hepatol Res 2001; 19:325-335. [PMID: 11251314 DOI: 10.1016/s1386-6346(00)00111-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Multifactorial elements are responsible for preservation and reperfusion injury in liver allografts. Sinusoidal endothelial cells (SECs) are a primary target of cold preservation injury of the liver. We examined the correlation between nitric oxide (NO) production by SECs and their injury during cold preservation. SECs were isolated from rat livers and preserved in either Euro-Collins (EC) or University of Wisconsin (UW) solution. Injury to the SECs was more severe when preserved in the EC solution than in the UW solution during cold ischemia. In addition, NO production by SECs was found to be proportionate to the cell injury. Cell viability was not improved by the addition of NO inhibitor, L-NMMA. Further, NO inhibitor was detrimental to the SECs in a 24-h preservation in UW solution. LDH release by SECs preserved in UW solution supplemented with L-NMMA was 11.10+/-2.03 IU/l, while that in UW solution alone was 3.70+/-0.70 IU/l (P<0.01). Together, our results suggest that NO protects SECs during cold preservation and that NO from SECs may have beneficial effects on the liver during cold ischemia.
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Affiliation(s)
- A Oishi
- First Department of Surgery, Okayama University Medical School, 2-5-1 Shikata-cho, 700-8558, Okayama, Japan
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Affiliation(s)
- S Matsumoto
- Department of Neurology, Neurological Institute, Kyushu University, Fukuoka, Japan
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Abstract
To evaluate whether hemodialysis with a dialysate containing no calcium (Ca-free HD) can induce hypocalcemia and restore the clinical signs and blood biochemical changes in naturally occurred hypocalcemic disorder in ruminants, the clinical signs and the changes in plasma electrolytes and minerals concentrations were observed in goats during 6-hr hemodialysis. The four goats received hemodialysis with the dialysate containing calcium (Ca HD), and 10 days later they had Ca-free HD. The plasma ionized Ca (Ca++) and total Ca (TCa) concentrations were not affected by Ca HD, whereas the levels significantly decreased during whole period of Ca-free HD. The Ca++ and TCa concentrations were 0.69+/-0.06 mmol/l and 5.9+/-0.3 mg/dl at 6 hr of Ca-free HD, respectively. The clinical signs observed during Ca-free HD seemed to resemble to those in naturally occurred hypocalcemic cases that were reported previously. Therefore, Ca-free HD was suggested to be one of the possible methods to induce experimental hypocalcemia in ruminants.
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Affiliation(s)
- N Yamagishi
- Department of Veterinary Internal Medicine, Faculty of Agriculture, Iwate University, Morioka, Japan
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Ota Y, Watanabe H, Fukasawa I, Tanaka S, Kawatsu T, Oishi A, Yasuda S, Inaba N. Placenta accreta/increta. Review of 10 cases and a case report. Arch Gynecol Obstet 1999; 263:69-72. [PMID: 10728633 DOI: 10.1007/s004040050265] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A review of the patients seen at the Department of Obstetrics at Dokkyo University Hospital who had suffered placenta accreta/increta in the past 18 years, was performed. There were 10 such cases out of 9,716 deliveries during this period. This incidence is higher than that which has been reported in other Western countries. Forty percent of the patients in our study had placenta accreta/increta accompanied by placenta previa or low lying; 30% had had a prior cesarean section (C/S); 70% had previously experienced dilatation and curettage (D & C); 80% had previously undergone a C/S and/or D & C: and 40% had a history of miscarriage. Three of the ten patients with placenta accreta/increta required a hysterectomy; 2 patients were successfully treated with hemostatic stitches on the endometrium; and the remaining 5 mild cases were treated with removal of the placenta, either manually or with the use of forceps. There was no case of maternal death. In 2 cases, neonatal asphyxia was noted, but the neonate immediately recovered.
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Affiliation(s)
- Y Ota
- Department of Obstetrics and Gynecology, Dokkyo University School of Medicine, Shimotsuga-gun, Tochigi, Japan
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Sakai Y, Oishi A, Takahashi F. Enhancement of enzyme reaction of magnetically anisotropic polyacrylamide gel rods immobilized with ferromagnetic powder and beta-D-galactosidase in an alternating magnetic field. Biotechnol Bioeng 1999; 62:363-7. [PMID: 10099548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
An immobilized polyacrylamide gel containing beta-D-galactosidase and Sr-Ba-ferrite was magnetized in a static magnetic field. The gel rods (10 mm long, O 2 mm) exhibiting magnetic anisotropy could move at lower than 100 Hz but not at higher than 250 Hz in an alternating magnetic field of 200 Oe. In case of immovability of gel rods, the apparent enzymic activity increased 3 times higher under exposure of an alternating magnetic field of 500 Oe (570 Hz). It could be explained that the ferromagnetic powder inside the gel might vibrate under the influence of elasticity of gel in the alternating magnetic field of 100 or 500 Oe and 0.2-12 kHz. This might facilitate faster diffusion of the substance inside the gel and transportation of the substrate and the product through the surface of gel. Consequently, the enzyme reaction was apparently activated.
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Affiliation(s)
- Y Sakai
- Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 2753 Ishii-machi, Utsunomiya 321-8585, Japan
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Oishi A, Inagaki M, Tanaka N. Correlation between nitric oxide production and preservation injury of sinusoidal endothelial cells during cold ischemia. Transplant Proc 1997; 29:1338-9. [PMID: 9123332 DOI: 10.1016/s0041-1345(96)00585-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- A Oishi
- First Department of Surgery, Okayama University Medical School, Japan
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Ishikawa T, Yagi T, Ishine N, Sadamori H, Sasaki H, Ota K, Matsuda H, Fujisawa K, Nakagawa K, Ishido N, Oishi A, Inagaki M, Saito S, Haisa M, Matsuno T, Tanaka N. Energy metabolism of the grafted liver and influence of preretrieval feeding process on swine orthotopic liver transplantation. Transplant Proc 1997; 29:397-9. [PMID: 9123054 DOI: 10.1016/s0041-1345(96)00135-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- T Ishikawa
- First Department of Surgery, Okayama University Medical School, Japan
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Matsuno T, Sasaki H, Ishido N, Nakagawa K, Ishikawa T, Oishi A, Inagaki M, Saito S, Yagi T, Haisa M, Tanaka N, Orita K. Apoptosis in human kidney allografts. Transplant Proc 1996; 28:1226-7. [PMID: 8658636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- T Matsuno
- First Department of Surgery, Okayama University Medical School, Japan
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Oishi A, Hamada S, Sakamoto H, Kamiya S, Yanagida K, Kubota C, Watanabe Y, Shimizu R. Radiographical evaluation of bone maturation in Japanese black beef cattle. J Vet Med Sci 1996; 58:529-35. [PMID: 8811621 DOI: 10.1292/jvms.58.529] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Epiphyseal ossification in the radius, ulna, metacarpus, proximal phalanx and tuber calcaneus was examined radiographically in Japanese Black beef cattle. The grade of standard ossification was assessed monthly for each epiphysis. Bone maturations could be divided into 8 grades for the distal radius and distal ulna, 7 grades for the distal metacarpus, 5 grades for the proximal phalanx, and 8 grades for the tuber calcaneus, respectively. The closure of the epiphyseal line completed at the earliest (12-14 months of age) on the proximal phalanx, and at the latest (35-37 months of age) on the distal ulna. Changes in gradings were steep at 0 to 5 months of age but became almost constant after 10 months of age in all the epiphyses. There were no significant differences in bone maturation between the cattle with different sex and breeding conditions.
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Affiliation(s)
- A Oishi
- Department of Veterinary Surgery, Faculty of Agriculture, Kagoshima University, Japan
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Abstract
OBJECTIVE To compare the stage-stratified survival of Japanese patients treated in Honolulu according to Western techniques with that of Japanese patients treated in Tokyo according to Japanese techniques, thus eliminating race as a potentially confounding variable. DESIGN AND PATIENTS Of 312 Honolulu Japanese patients surviving Western-type gastric resection for neoplasm between 1974 and 1985, 279 were identified with invasive gastric adenocarcinoma unassociated with any second malignancy. This Honolulu cohort, treated by Western methods, was retrospectively compared with a similar, previously described cohort of 3176 Tokyo Japanese patients treated according to Japanese methods. MAIN OUTCOME MEASURES American Joint Committee on Cancer/Union Internationale Contre le Cancer criteria for stage-stratified survival. RESULTS Despite non-TNM prognostic factors favoring higher survival for the Honolulu Japanese patients, for every TNM stage, we observed higher survival for the Tokyo Japanese patients who were treated according to Japanese techniques. For stage I disease, the survival rates were 86% vs 96%, respectively (P < .001); for state II, 69% vas 77% (P = .15); for stage III, 21% vs 49% (P < .001); and for stage IV, 4% vs 14% (P < .001). CONCLUSIONS Because all patients in this study are Japanese, race-related factors or the "different-disease" hypothesis cannot explain these results. Lymphadenectomy-related stage-migration and/or differing therapeutic efficacy seem more likely explanations.
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Affiliation(s)
- S A Hundahl
- Queen's Medical Center, Cancer Research Center of Hawaii, Honolulu, USA
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Oishi A, Hamada S, Sakamoto H, Shimizu R. Preventive effects of recombinant human erythropoietin administration on anemia associated with repeated hemodialysis in nephrectomized dogs. J Vet Med Sci 1995; 57:989-90. [PMID: 8593322 DOI: 10.1292/jvms.57.989] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The preventive effects of recombinant human erythropoietin (rhEPO) administration on progression of anemia were evaluated during hemodialysis in nephrectomized dogs. In control dogs given no rhEPO, anemia gradually progressed with repeated hemodialysis and with little erythropoietic response observed in the bone marrow. In dogs administered with rhEPO, however, an active erythropoietic response was induced in the bone marrow, indicating that anemia due to hemodialysis was being prevented.
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Affiliation(s)
- A Oishi
- Department of Veterinary Surgery, Faculty of Agriculture, Kagoshima University, Japan
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41
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Abstract
Erythropoietin (EPO) levels in plasma from 124 clinically anemic dogs were determined by in vivo bioassay. In 81 anemic dogs with normal renal function, the concentration of plasma EPO showed a close correlation with the hemoglobin concentration. The plasma EPO level was obviously decreased in 43 anemic dogs with renal failure. Of these dogs with renal failure, 17 showed no detectable plasma EPO and resulted in the death of these dogs. In the remaining 26 dogs having detectable plasma EPO, the plasma concentration rate of EPO related to blood urea nitrogen and serum creatinine values.
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Affiliation(s)
- A Oishi
- Department of Veterinary Surgery, Faculty of Agriculture, Kagoshima University, Japan
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42
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Oishi A, Sakamoto H, Shimizu R, Ohashi F, Takeuchi A. Evaluation of erythropoietin production in dogs with reduced functional renal tissue. J Vet Med Sci 1993; 55:543-8. [PMID: 8399730 DOI: 10.1292/jvms.55.543] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
This study was designed to determine the quantity of functional renal tissue needed to maintain homeostasis of red blood cell production by evaluating the erythropoietin (EPO) production response to phlebotomic stimulation in the 1/2- and 1/4-kidney dogs surgically prepared. The results showed that the reduction in functional renal tissue caused a decrease in EPO production, which led to the delay in recovery from anemia. In the anemic progress stage, the plasma EPO level showed a transition proportional to the quantity of functional renal tissue immediately after the operation for tissue reduction. The 1/2-kidney dog group still kept such proportional relation even in the recovery stage. Thus, the half of the normal renal tissue was considered sufficiently contributory to EPO production needed to maintain homeostasis of red blood cell production. However, the 1/4-kidney dog group precipitously decreased in plasma EPO level in the recovery stage and fell into an extremely unfavorable anemia. This indicated that homeostatic maintenance in erythropoiesis would be impossible more below a quarter of normal renal tissue. These findings disclosed that reduction in functional renal tissue quantity would sensitively influence homeostatic maintenance of red blood cell production through the decrease in EPO production, even if it does not affect renal function concerned with urine production.
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Affiliation(s)
- A Oishi
- Department of Veterinary Surgery, Faculty of Agriculture, Kagoshima University, Japan
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43
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Abstract
Erythropoietin (EPO) production in dogs was studied by reducing red blood cells with phlebotomy. In this study, the hemoglobin reduction rate (delta %Hb) was newly taken into account as the regulating factor for EPO production, and its usefulness to estimate the stimulating intensity to EPO production was examined. As the result, plasma EPO was highly correlated with delta %Hb showing the importance related to regulation of EPO production, in the increasing plasma EPO by different degrees of phlebotomy, in the change of plasma EPO through the anemia progress and recovery period after severe phlebotomy, and in the initial variation of plasma EPO induced by chronic mild phlebotomy. On the other hand, increasing EPO production appeared at least within 6 hr after acute severe phlebotomy, which revealed significantly higher plasma level compared with the mild chronic phlebotomy, suggesting the effect of time leading to red blood cell reduction on EPO production response. Simultaneously, considering an in vivo EPO half life of 8.4 hr calculated from plasma EPO disappearance after bilateral nephrectomy, endogenous plasma EPO accumulation should be taken into consideration in rapidly increasing of delta %Hb.
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Affiliation(s)
- A Oishi
- Department of Veterinary Surgery, Faculty of Agriculture, Kagoshima University, Japan
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44
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Hachisuka H, Oishi A, Mori O, Karashima T, Sasai Y. An immunohistochemical study of the c-erbB-2 protein expression in mammary and extramammary Paget's disease. J Dermatol Sci 1992. [DOI: 10.1016/0923-1811(92)90099-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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45
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Oishi A, Sakamoto H, Shimizu R, Ohashi F, Takeuchi A. Evaluation of plasma erythropoietin levels in normal adult dogs by in vivo bioassay using concentrated plasma. J Vet Med Sci 1992; 54:621-8. [PMID: 1391170 DOI: 10.1292/jvms.54.621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Measurement of plasma erythropoietin level in normal dogs by in vivo bioassay has been considered to be impossible so far. In the present study, we successfully determined it by using concentrated plasma 60 times which allowed the lower limit to 2.7 mU/ml. This normal plasma erythropoietin level was the first to be determined as an in vivo bioactivity and was 9.14 +/- 7.81 mU/ml in 75 normal adult dogs. This value was sufficiently reliable in terms of accuracy of determination and considered to be meaningful as the low level in vivo bioactivity that hasn't been known to date. Furthermore, erythropoietin levels in normal plasma were within a certain lower range and showed neither difference in plasma erythropoietin level between males and females or among breeds nor correlation between erythropoietin and hemoglobin level.
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Affiliation(s)
- A Oishi
- Department of Veterinary Surgery, Faculty of Agriculture, Kagoshima University, Japan
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46
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Abstract
Using chromogranin (CG) immunohistochemical staining, the prognostic significance of endocrine differentiation was investigated in 212 patients with primary colorectal adenocarcinoma (including 6 patients with mucosal carcinoma). CG-immunoreactive cells were found to be an integral component of the tumor in 67 of 206 patients (32.5%, excluding mucosal carcinoma). The intracellular localization of CG in the CG-immunoreactive cells in cancer tissue was completely different from that in the normal endocrine cells of the large bowel. In addition, morphologic changes such as nuclear hyperchromasia and pleomorphism also indicated that the CG-immunoreactive cells in the cancer tissue were malignant. The tumors were divided into three groups based on the frequency of CG-immunoreactive cells: Group I (n = 139), negative; Group II (n = 38), less than 1 positive cell/mm2; and Group III (n = 29), more than 1 positive cell/mm2. No correlation was observed between CG-immunoreactivity (CG-IR) and tumor location, grade, depth of invasion, or stage, regardless of lymph node involvement. However, patients with numerous endocrine tumor cells (Group III) had a significantly worse prognosis compared with patients without endocrine cells (Group I) (multivariate Cox's model, P less than 0.01). Similar findings were observed in patients with node-negative tumor (multivariate Cox's model, P less than 0.05). These results indicated that the neuroendocrine differentiation is an independent prognostic factor and that CG-immunohistochemistry is useful for detecting a subgroup with a worse prognosis among patients with colorectal cancer.
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Affiliation(s)
- Y Hamada
- Department of Surgery, Kansai Medical University, Osaka, Japan
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47
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Usuba A, Motoki R, Koizumi Y, Oishi A, Endo Y, Konno O, Inoue H. [Effects of the synthetic proteinase inhibitor, FOY, on hypercoagulability after surgery for esophageal carcinoma]. Nihon Geka Gakkai Zasshi 1990; 91:931-41. [PMID: 2122227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Hypercoagulability develops after surgery for esophageal carcinoma, and it related closely to postoperative complications. This study evaluated the effects of the synthetic proteinase inhibitor, Cabexate Mesilate (FOY), on this hypercoagulability. The subjects used were 25 patients with a mean age of 63 who had undergone surgery for esophageal carcinoma. Of these, eight patients (test group) received FOY (2,000 mg/day) for three to 23 days after surgery, but 17 (control group) did not. In the test group, FOY controlled aggregation and release of the platelets and minimized their exhaustion. FOY almost completely checked the abnormal increase in thrombin activity which might trigger the hypercoagulability. Also, FOY suppressed the fibrinolytic activity slightly. These results indicate that FOY is effective in controlling hypercoagulability after surgery for esophageal carcinoma and in suppressing activity of the proteinases that cause both blood coagulation and fibrinolysis.
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Affiliation(s)
- A Usuba
- First Department of Surgery, Fukushima Medical College, Japan
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48
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Oishi A. [Immunohistochemical and clinicopathological studies of chromogranin immunoreactive cells in large bowel carcinoma]. Nihon Geka Gakkai Zasshi 1989; 90:1742-51. [PMID: 2594002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We examined the clinicopathological relevance of chromogranin immunoreactive cells in a well documented series of 212 large bowel cancer patients. Chromogranin immunoreactive cells were detected in 33.5% of the carcinomas, occurring either as rare cases (19.3%) or as diffuse cases (14.2%). The tumors with chromogranin immunoreactivity were associated with a more aggressive clinical course than tumors without immunoreactivity (Generalized-Wilcoxon; p less than 0.08). Moreover, the survival of patients with diffusely immunoreactive tumors was significantly shorter than that of patients without such cells (Generalized-Wilcoxon; p less than 0.009). Therefore, the study of chromogranin immunoreactivity in large bowel carcinomas may enable the identification of a subpopulation of colorectal carcinomas associated with a relatively poor prognosis.
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Affiliation(s)
- A Oishi
- Department of Surgery, Kansai Medical University, Osaka, Japan
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Arimoto A, Ojima M, Chinone N, Oishi A, Gotoh T, Ohnuki N. Optimum conditions for the high frequency noise reduction method in optical videodisc players. Appl Opt 1986; 25:1398. [PMID: 18231350 DOI: 10.1364/ao.25.001398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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50
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Kosaka Y, Tameda Y, Kawarada R, Takase K, Oishi A, Ito N, Masuda Y, Matsuo M, Tsukamoto H, Tanaka K, Hamaguchi K, Kuniyoshi M, Ito T, Araoka Y, Kakiuchi S, Kobayashi M, Matsumoto H. [Renal failure in fulmiant hepatitis--the clinicopathological study of 39 cases (author's transl)]. Nihon Shokakibyo Gakkai Zasshi 1981; 78:864-73. [PMID: 7277795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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