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Mothes T, Portal B, Konstantinidis E, Eltom K, Libard S, Streubel-Gallasch L, Ingelsson M, Rostami J, Lindskog M, Erlandsson A. Astrocytic uptake of neuronal corpses promotes cell-to-cell spreading of tau pathology. Acta Neuropathol Commun 2023; 11:97. [PMID: 37330529 PMCID: PMC10276914 DOI: 10.1186/s40478-023-01589-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [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: 05/24/2023] [Accepted: 05/25/2023] [Indexed: 06/19/2023] Open
Abstract
Tau deposits in astrocytes are frequently found in Alzheimer's disease (AD) and other tauopathies. Since astrocytes do not express tau, the inclusions have been suggested to be of neuronal origin. However, the mechanisms behind their appearance and their relevance for disease progression remain unknown. Here we demonstrate, using a battery of experimental techniques that human astrocytes serve as an intermediator, promoting cell-to-cell spreading of pathological tau. Human astrocytes engulf and process, but fail to fully degrade dead neurons with tau pathology, as well as synthetic tau fibrils and tau aggregates isolated from AD brain tissue. Instead, the pathogenic tau is spread to nearby cells via secretion and tunneling nanotube mediated transfer. By performing co-culture experiments we could show that tau-containing astrocytes induce tau pathology in healthy human neurons directly. Furthermore, our results from a FRET based seeding assay, demonstrated that the tau proteoforms secreted by astrocytes have an exceptional seeding capacity, compared to the original tau species engulfed by the cells. Taken together, our study establishes a central role for astrocytes in mediating tau pathology, which could be of relevance for identifying novel treatment targets for AD and other tauopathies.
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Affiliation(s)
- Tobias Mothes
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden
| | - Benjamin Portal
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Evangelos Konstantinidis
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden
| | - Khalid Eltom
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden
| | - Sylwia Libard
- Department of Immunology, Genetics and Pathology, Neuro-Oncology and Neurodegeneration, Uppsala University, Uppsala, Sweden
| | - Linn Streubel-Gallasch
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden
| | - Martin Ingelsson
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden
- University Health Network, Krembil Brain Institute, Toronto, Canada
- Department of Medicine and Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Canada
| | - Jinar Rostami
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden
| | - Maria Lindskog
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Anna Erlandsson
- Department of Public Health and Caring Sciences; Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, 752 37, Uppsala, Sweden.
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Konstantinidis E, Portal B, Mothes T, Beretta C, Lindskog M, Erlandsson A. Intracellular deposits of amyloid-beta influence the ability of human iPSC-derived astrocytes to support neuronal function. J Neuroinflammation 2023; 20:3. [PMID: 36593462 PMCID: PMC9809017 DOI: 10.1186/s12974-022-02687-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 12/23/2022] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Astrocytes are crucial for maintaining brain homeostasis and synaptic function, but are also tightly connected to the pathogenesis of Alzheimer's disease (AD). Our previous data demonstrate that astrocytes ingest large amounts of aggregated amyloid-beta (Aβ), but then store, rather than degrade the ingested material, which leads to severe cellular stress. However, the involvement of pathological astrocytes in AD-related synaptic dysfunction remains to be elucidated. METHODS In this study, we aimed to investigate how intracellular deposits of Aβ in astrocytes affect their interplay with neurons, focusing on neuronal function and viability. For this purpose, human induced pluripotent stem cell (hiPSC)-derived astrocytes were exposed to sonicated Αβ42 fibrils. The direct and indirect effects of the Αβ-exposed astrocytes on hiPSC-derived neurons were analyzed by performing astrocyte-neuron co-cultures as well as additions of conditioned media or extracellular vesicles to pure neuronal cultures. RESULTS Electrophysiological recordings revealed significantly decreased frequency of excitatory post-synaptic currents in neurons co-cultured with Aβ-exposed astrocytes, while conditioned media from Aβ-exposed astrocytes had the opposite effect and resulted in hyperactivation of the synapses. Clearly, factors secreted from control, but not from Aβ-exposed astrocytes, benefited the wellbeing of neuronal cultures. Moreover, reactive astrocytes with Aβ deposits led to an elevated clearance of dead cells in the co-cultures. CONCLUSIONS Taken together, our results demonstrate that inclusions of aggregated Aβ affect the reactive state of the astrocytes, as well as their ability to support neuronal function.
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Affiliation(s)
- Evangelos Konstantinidis
- grid.8993.b0000 0004 1936 9457Department of Public Health and Caring Sciences, Molecular Geriatrics, Uppsala University, 751 85 Uppsala, Sweden
| | - Benjamin Portal
- grid.8993.b0000 0004 1936 9457Department of Medical Cell Biology, Uppsala University, 751 23 Uppsala, Sweden
| | - Tobias Mothes
- grid.8993.b0000 0004 1936 9457Department of Public Health and Caring Sciences, Molecular Geriatrics, Uppsala University, 751 85 Uppsala, Sweden
| | - Chiara Beretta
- grid.8993.b0000 0004 1936 9457Department of Public Health and Caring Sciences, Molecular Geriatrics, Uppsala University, 751 85 Uppsala, Sweden
| | - Maria Lindskog
- grid.8993.b0000 0004 1936 9457Department of Medical Cell Biology, Uppsala University, 751 23 Uppsala, Sweden
| | - Anna Erlandsson
- grid.8993.b0000 0004 1936 9457Department of Public Health and Caring Sciences, Molecular Geriatrics, Uppsala University, 751 85 Uppsala, Sweden
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Portal B, Vasile F, Zapata J, Lejards C, Ait Tayeb AEK, Colle R, Verstuyft C, Corruble E, Rouach N, Guiard BP. Astroglial Connexins Inactivation Increases Relapse of Depressive-like Phenotype after Antidepressant Withdrawal. Int J Mol Sci 2022; 23:13227. [PMID: 36362016 PMCID: PMC9656718 DOI: 10.3390/ijms232113227] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 10/08/2022] [Revised: 10/26/2022] [Accepted: 10/28/2022] [Indexed: 09/11/2023] Open
Abstract
Studies suggest that astrocytic connexins (Cx) have an important role in the regulation of high brain functions through their ability to establish fine-tuned communication with neurons within the tripartite synapse. In light of these properties, growing evidence suggests a role of Cx in psychiatric disorders such as major depression but also in the therapeutic activity of antidepressant drugs. However, the real impact of Cx on treatment response and the underlying neurobiological mechanisms remain yet to be clarified. On this ground, the present study was designed to evaluate the functional activity of Cx in a mouse model of depression based on chronic corticosterone exposure and to determine to which extent their pharmacological inactivation influences the antidepressant-like activity of venlafaxine (VENLA). On the one hand, our results indicate that depressed mice have impaired Cx-based gap-junction and hemichannel activities. On the other hand, while VENLA exerts robust antidepressant-like activity in depressed mice; this effect is abolished by the pharmacological inhibition of Cx with carbenoxolone (CBX). Interestingly, the combination of VENLA and CBX is also associated with a higher rate of relapse after treatment withdrawal. To our knowledge, this study is one of the first to develop a model of relapse, and our results reveal that Cx-mediated dynamic neuroglial interactions play a critical role in the efficacy of monoaminergic antidepressant drugs, thus providing new targets for the treatment of depression.
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Affiliation(s)
- Benjamin Portal
- Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative, Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Flora Vasile
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNRS UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Jonathan Zapata
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNRS UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Camille Lejards
- Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative, Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Abd El Kader Ait Tayeb
- CESP, MOODS Team, INSERM, Faculté de Médecine, University of Paris-Saclay, 94275 Le Kremlin Bicêtre, France
- Service Hospitalo-Universitaire de Psychiatrie de Bicêtre, Hôpitaux Universitaires Paris-Saclay, Assistance Publique-Hôpitaux de Paris, Hôpital de Bicêtre, 94275 Le Kremlin Bicêtre, France
| | - Romain Colle
- CESP, MOODS Team, INSERM, Faculté de Médecine, University of Paris-Saclay, 94275 Le Kremlin Bicêtre, France
- Service Hospitalo-Universitaire de Psychiatrie de Bicêtre, Hôpitaux Universitaires Paris-Saclay, Assistance Publique-Hôpitaux de Paris, Hôpital de Bicêtre, 94275 Le Kremlin Bicêtre, France
| | - Céline Verstuyft
- CESP, MOODS Team, INSERM, Faculté de Médecine, University of Paris-Saclay, 94275 Le Kremlin Bicêtre, France
- Service de Génétique Moléculaire, Pharmacogénétique et Hormonologie de Bicêtre, Hôpitaux Universitaires Paris-Saclay, Assistance Publique-Hôpitaux de Paris, Hôpital de Bicêtre, 94275 Le Kremlin Bicêtre, France
| | - Emmanuelle Corruble
- CESP, MOODS Team, INSERM, Faculté de Médecine, University of Paris-Saclay, 94275 Le Kremlin Bicêtre, France
- Service Hospitalo-Universitaire de Psychiatrie de Bicêtre, Hôpitaux Universitaires Paris-Saclay, Assistance Publique-Hôpitaux de Paris, Hôpital de Bicêtre, 94275 Le Kremlin Bicêtre, France
| | - Nathalie Rouach
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNRS UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Bruno P. Guiard
- Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative, Université de Toulouse, CNRS, 31062 Toulouse, France
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Dentoni G, Naia L, Portal B, Leal NS, Nilsson P, Lindskog M, Ankarcrona M. Mitochondrial Alterations in Neurons Derived from the Murine AppNL-F Knock-In Model of Alzheimer’s Disease. J Alzheimers Dis 2022; 90:565-583. [DOI: 10.3233/jad-220383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background: Alzheimer’s disease (AD) research has relied on mouse models overexpressing human mutant A βPP; however, newer generation knock-in models allow for physiological expression of amyloid-β protein precursor (AβPP) containing familial AD mutations where murine AβPP is edited with a humanized amyloid-β (Aβ) sequence. The AppNL-F mouse model has shown substantial similarities to AD brains developing late onset cognitive impairment. Objective: In this study, we aimed to characterize mature primary cortical neurons derived from homozygous AppNL-F embryos, especially to identify early mitochondrial alterations in this model. Methods: Primary cultures of AppNL-F neurons kept in culture for 12–15 days were used to measure Aβ levels, secretase activity, mitochondrial functions, mitochondrial-ER contacts, synaptic function, and cell death. Results: We detected higher levels of Aβ42 released from AppNL-F neurons as compared to wild-type neurons. AppNL-F neurons, also displayed an increased Aβ42/Aβ40 ratio, similar to adult AppNL-F mouse brain. Interestingly, we found an upregulation in mitochondrial oxygen consumption with concomitant downregulation in glycolytic reserve. Furthermore, AppNL-F neurons were more susceptible to cell death triggered by mitochondrial electron transport chain inhibition. Juxtaposition between ER and mitochondria was found to be substantially upregulated, which may account for upregulated mitochondrial-derived ATP production. However, anterograde mitochondrial movement was severely impaired in this model along with loss in synaptic vesicle protein and impairment in pre- and post-synaptic function. Conclusion: We show that widespread mitochondrial alterations can be detected in AppNL-F neurons in vitro, where amyloid plaque deposition does not occur, suggesting soluble and oligomeric Aβ-species being responsible for these alterations.
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Affiliation(s)
- Giacomo Dentoni
- Department of Neurobiology, Karolinska Institutet, Care Science and Society, Division of Neurogeriatrics, Stockholm, Sweden
| | - Luana Naia
- Department of Neurobiology, Karolinska Institutet, Care Science and Society, Division of Neurogeriatrics, Stockholm, Sweden
| | - Benjamin Portal
- Department of Neuroscience, Uppsala University, Uppsala, Sweden
| | - Nuno Santos Leal
- Department of Neurobiology, Karolinska Institutet, Care Science and Society, Division of Neurogeriatrics, Stockholm, Sweden
| | - Per Nilsson
- Department of Neurobiology, Karolinska Institutet, Care Science and Society, Division of Neurogeriatrics, Stockholm, Sweden
| | - Maria Lindskog
- Department of Neuroscience, Uppsala University, Uppsala, Sweden
| | - Maria Ankarcrona
- Department of Neurobiology, Karolinska Institutet, Care Science and Society, Division of Neurogeriatrics, Stockholm, Sweden
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Ygberg S, Akkuratov EE, Howard RJ, Taylan F, Jans DC, Mahato DR, Katz A, Kinoshita PF, Portal B, Nennesmo I, Lindskog M, Karlish SJD, Andersson M, Lindstrand A, Brismar H, Aperia A. A missense mutation converts the Na +,K +-ATPase into an ion channel and causes therapy-resistant epilepsy. J Biol Chem 2021; 297:101355. [PMID: 34717959 PMCID: PMC8637647 DOI: 10.1016/j.jbc.2021.101355] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 05/04/2021] [Revised: 10/14/2021] [Accepted: 10/25/2021] [Indexed: 11/16/2022] Open
Abstract
The ion pump Na+,K+-ATPase is a critical determinant of neuronal excitability; however, its role in the etiology of diseases of the central nervous system (CNS) is largely unknown. We describe here the molecular phenotype of a Trp931Arg mutation of the Na+,K+-ATPase catalytic α1 subunit in an infant diagnosed with therapy-resistant lethal epilepsy. In addition to the pathological CNS phenotype, we also detected renal wasting of Mg2+. We found that membrane expression of the mutant α1 protein was low, and ion pumping activity was lost. Arginine insertion into membrane proteins can generate water-filled pores in the plasma membrane, and our molecular dynamic (MD) simulations of the principle states of Na+,K+-ATPase transport demonstrated massive water inflow into mutant α1 and destabilization of the ion-binding sites. MD simulations also indicated that a water pathway was created between the mutant arginine residue and the cytoplasm, and analysis of oocytes expressing mutant α1 detected a nonspecific cation current. Finally, neurons expressing mutant α1 were observed to be depolarized compared with neurons expressing wild-type protein, compatible with a lowered threshold for epileptic seizures. The results imply that Na+,K+-ATPase should be considered a neuronal locus minoris resistentia in diseases associated with epilepsy and with loss of plasma membrane integrity.
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Affiliation(s)
- Sofia Ygberg
- Neuropediatric Unit, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden; Centre for Inherited Metabolic Diseases (CMMS), Karolinska University Hospital, Stockholm, Sweden
| | - Evgeny E Akkuratov
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
| | - Rebecca J Howard
- Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Fulya Taylan
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden; Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
| | - Daniel C Jans
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
| | | | - Adriana Katz
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovoth, Israel
| | - Paula F Kinoshita
- Department of Pharmacology, Institute of Biomedical Science, University of São Paulo, São Paulo, Brazil
| | - Benjamin Portal
- Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
| | - Inger Nennesmo
- Department of Pathology, Karolinska University Hospital, Stockholm, Sweden
| | - Maria Lindskog
- Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
| | - Steven J D Karlish
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovoth, Israel
| | | | - Anna Lindstrand
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden; Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden
| | - Hjalmar Brismar
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden; Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.
| | - Anita Aperia
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
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Portal B, Guiard BP. [Role of astrocytic connexins in the regulation of extracellular glutamate levels: implication for the treatment of major depressive episodes]. Biol Aujourdhui 2020; 214:71-83. [PMID: 33357364 DOI: 10.1051/jbio/2020008] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Indexed: 11/14/2022]
Abstract
Major depression is a psychiatric disorder relying on different neurobiological mechanisms. In particular, a hypersensitivity of the hypothalamic-pituitary-adrenal axis leading to an excess of cortisol in blood and a deficit in monoaminergic neurotransmission have been associated with mood disorders. In keeping with these mechanisms, currently available antidepressant drugs act by increasing the extracellular levels of monoamines in the synaptic cleft. Since the discovery of the rapid and long-lasting antidepressant effects of ketamine, an NMDA receptor antagonist, a growing attention in psychiatry is paid to the pharmacological tools able to attenuate glutamatergic neurotransmission. Astrocytes play an important role in the excitatory/inhibitory balance of the central nervous system through the regulation of glutamate reuptake and secretion. Interestingly, the release of this excitatory amino acid is controlled, at least in part, by plasma membrane proteins (i.e. connexins) that cluster together to form gap junctions or hemichannels. Preclinical evidence suggests that these functional entities play a critical role in emotional behaviour. After a brief overview of the literature on mood disorders and related treatments, this review describes the role of astrocytes and connexins in glutamatergic neurotransmission and major depression. Moreover, we highlight the arguments supporting the therapeutic potential of connexins blockers but also the practical difficulties to target the hemichannels while maintaining gap junctions intact.
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Affiliation(s)
- Benjamin Portal
- Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative, Université de Toulouse, CNRS, 31000 Toulouse, France
| | - Bruno P Guiard
- Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative, Université de Toulouse, CNRS, 31000 Toulouse, France
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Droguerre M, Duchêne A, Picoli C, Portal B, Lejards C, Guiard BP, Meunier J, Villard V, Déglon N, Hamon M, Mouthon F, Charvériat M. Efficacy of THN201, a Combination of Donepezil and Mefloquine, to Reverse Neurocognitive Deficits in Alzheimer's Disease. Front Neurosci 2020; 14:563. [PMID: 32612499 PMCID: PMC7309601 DOI: 10.3389/fnins.2020.00563] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 03/23/2020] [Accepted: 05/07/2020] [Indexed: 01/15/2023] Open
Abstract
Donepezil (DPZ) is an acetylcholinesterase inhibitor used in Alzheimer’s disease to restore cognitive functions but is endowed with limited efficacy. Recent studies pointed out the implication of astroglial networks in cognitive processes, notably via astrocyte connexins (Cxs), proteins involved in gap junction intercellular communications. Hence, we investigated the impact on cognition of pharmacological or genetic modulations of those astrocyte Cxs during DPZ challenge in two rodent models of Alzheimer’s disease–like memory deficits. We demonstrated that the Cx modulator mefloquine (MEF) significantly enhanced the procognitive effect of DPZ in both models. In parallel, we determined that MEF potentiated DPZ-induced release of acetylcholine in hippocampus. Finally, local genetic silencing of astrocyte Cxs in the hippocampus was also found to enhance the procognitive effect of DPZ, pointing out the importance of Cx-dependent astrocyte networks in memory processes.
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Affiliation(s)
| | | | | | - Benjamin Portal
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), CNRS, UPS, Université de Toulouse, Toulouse, France
| | - Camille Lejards
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), CNRS, UPS, Université de Toulouse, Toulouse, France
| | - Bruno P Guiard
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), CNRS, UPS, Université de Toulouse, Toulouse, France
| | | | | | - Nicole Déglon
- Laboratory of Neurotherapies and NeuroModulation, Neuroscience Research Center (CRN), University of Lausanne, Lausanne, Switzerland.,Laboratory of Neurotherapies and NeuroModulation, Department of Clinical Neuroscience (DNC), Lausanne University Hospital (CHUV), Lausanne, Switzerland
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Portal B, Delcourte S, Rovera R, Lejards C, Bullich S, Malnou CE, Haddjeri N, Déglon N, Guiard BP. Genetic and pharmacological inactivation of astroglial connexin 43 differentially influences the acute response of antidepressant and anxiolytic drugs. Acta Physiol (Oxf) 2020; 229:e13440. [PMID: 31925934 DOI: 10.1111/apha.13440] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [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: 10/01/2019] [Revised: 12/18/2019] [Accepted: 01/02/2020] [Indexed: 12/12/2022]
Abstract
AIM Astroglial connexins (Cxs) 30 and 43 are engaged in gap junction and hemichannel activities. Evidence suggests that these functional entities contribute to regulating neurotransmission, thereby influencing brain functions. In particular, preclinical and clinical findings highlight a role of Cx43 in animal models of depression. However, the role of these proteins in response to currently available psychotropic drugs is still unknown. METHODS To investigate this, we evaluated the behavioural effects of the genetic and pharmacological inactivation of Cx43 on the antidepressant- and anxiolytic-like activities of the selective serotonin reuptake inhibitor fluoxetine and the benzodiazepine diazepam, respectively. RESULTS A single administration of fluoxetine (18 mg/kg; i.p.) produced a higher increase in hippocampal extracellular serotonin levels, and a greater antidepressant-like effect in the tail suspension test in Cx43 knock-down (KD) mice bred on a C57BL/6 background compared to their wild-type littermates. Similarly, in outbred Swiss wild-type mice, the intra-hippocampal injection of a shRNA-Cx43 or the acute systemic injection of the Cxs inhibitor carbenoxolone (CBX: 10 mg/kg; i.p.) potentiated the antidepressant-like effects of fluoxetine. Evaluating the effects of such strategies on diazepam (0.5 mg/kg; i.p.), the results indicate that Cx43 KD mice or wild-types injected with a shRNA-Cx43 in the amygdala, but not in the hippocampus, attenuated the anxiolytic-like effects of this benzodiazepine in the elevated plus maze. The chronic systemic administration of CBX mimicked the latter observations. CONCLUSION Collectively, these data pave the way to the development of potentiating strategies in the field of psychiatry based on the modulation of astroglial Cx43.
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Affiliation(s)
- Benjamin Portal
- Centre de Recherches sur la Cognition Animale (CRCA) Centre de Biologie Intégrative (CBI) Université Paul Sabatier Toulouse III Toulouse France
| | - Sarah Delcourte
- Univ Lyon Université Claude Bernard Lyon 1 Inserm Stem Cell and Brain Research Institute U1208 Bron France
| | - Renaud Rovera
- Univ Lyon Université Claude Bernard Lyon 1 Inserm Stem Cell and Brain Research Institute U1208 Bron France
| | - Camille Lejards
- Centre de Recherches sur la Cognition Animale (CRCA) Centre de Biologie Intégrative (CBI) Université Paul Sabatier Toulouse III Toulouse France
| | - Sebastien Bullich
- Centre de Recherches sur la Cognition Animale (CRCA) Centre de Biologie Intégrative (CBI) Université Paul Sabatier Toulouse III Toulouse France
| | - Cécile E. Malnou
- Centre de Physiopathologie Toulouse‐Purpan (CPTP) INSERM CNRS Université de Toulouse Toulouse France
| | - Nasser Haddjeri
- Univ Lyon Université Claude Bernard Lyon 1 Inserm Stem Cell and Brain Research Institute U1208 Bron France
| | - Nicole Déglon
- Department of Clinical Neurosciences Laboratory of Neurotherapies and Neuromodulation (LNTM) Lausanne University Hospital Lausanne Switzerland
- Neuroscience Research Center LNTM Lausanne University Hospital Lausanne Switzerland
| | - Bruno P. Guiard
- Centre de Recherches sur la Cognition Animale (CRCA) Centre de Biologie Intégrative (CBI) Université Paul Sabatier Toulouse III Toulouse France
- Faculté de Pharmacie Université Paris Sud Université Paris‐Saclay Chatenay‐Malabry France
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Droguerre M, Tsurugizawa T, Duchêne A, Portal B, Guiard BP, Déglon N, Rouach N, Hamon M, Mouthon F, Ciobanu L, Charvériat M. A New Tool for In Vivo Study of Astrocyte Connexin 43 in Brain. Sci Rep 2019; 9:18292. [PMID: 31797899 PMCID: PMC6892890 DOI: 10.1038/s41598-019-54858-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 11/20/2019] [Indexed: 01/22/2023] Open
Abstract
Astrocytes are glial cells organized in dynamic and structured networks in the brain. These plastic networks, involving key proteins such as connexin 43 (Cx43), are engaged in fine neuronal tuning and have recently been considered as emerging therapeutic targets in central nervous system disorders. We developed and validated a new application of the manganese-enhanced magnetic resonance imaging (MEMRI) technique allowing in vivo investigations of astrocyte-neuron interactions through quantification of brain Cx43 functional activity. The proof of concept has been achieved by quantification of MEMRI signals in brain after either local astrocyte-specific Cx43 knockdown with shRNA or systemic administration of Cx43 blockers. Unilateral hippocampal Cx43 genetical silencing was associated with an ipsilateral local increase of MEMRI signal. Furthermore, Cx43 blockers also enhanced MEMRI signal responses in hippocampus. Altogether, these data reveal the MEMRI technique as a tool for quantitative imaging of in vivo Cx43-dependent function in astrocytes under physiological and pathological conditions.
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Affiliation(s)
| | | | | | - Benjamin Portal
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, 31330, Toulouse, France
| | - Bruno P Guiard
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, 31330, Toulouse, France
| | - Nicole Déglon
- Laboratory of Neurotherapies and NeuroModulation, Neuroscience research Center (CRN), Lausanne University Hospital (CHUV) and University of Lausanne, 1011, Lausanne, Switzerland.,Laboratory of Neurotherapies and NeuroModulation, Department of Clinical Neuroscience (DNC), Lausanne University Hospital (CHUV) and University of Lausanne, 1011, Lausanne, Switzerland
| | - Nathalie Rouach
- Laboratory of Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNRS UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, Paris, 75005, France
| | - Michel Hamon
- Theranexus, 60 Avenue Rockefeller, 69008, Lyon, France
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Quesseveur G, Portal B, Basile JA, Ezan P, Mathou A, Halley H, Leloup C, Fioramonti X, Déglon N, Giaume C, Rampon C, Guiard BP. Attenuated Levels of Hippocampal Connexin 43 and its Phosphorylation Correlate with Antidepressant- and Anxiolytic-Like Activities in Mice. Front Cell Neurosci 2015; 9:490. [PMID: 26733815 PMCID: PMC4686612 DOI: 10.3389/fncel.2015.00490] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [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: 10/23/2015] [Accepted: 12/03/2015] [Indexed: 11/13/2022] Open
Abstract
Clinical and preclinical studies have implicated glial anomalies in major depression. Conversely, evidence suggests that the activity of antidepressant drugs is based, at least in part, on their ability to stimulate density and/or activity of astrocytes, a major glial cell population. Despite this recent evidence, little is known about the mechanism(s) by which astrocytes regulate emotionality. Glial cells communicate with each other through gap junction channels (GJCs), while they can also directly interact with neurons by releasing gliotransmitters in the extracellular compartment via an hemichannels (HCs)-dependent process. Both GJCs and HCs are formed by two main protein subunits: connexins (Cx) 30 and 43 (Cx30 and Cx43). Here we investigate the role of hippocampal Cx43 in the regulation of depression-like symptoms using genetic and pharmacological approaches. The first aim of this study was to evaluate the impact of the constitutive knock-down of Cx43 on a set of behaviors known to be affected in depression. Conversely, the expression of Cx43 was assessed in the hippocampus of mice subjected to prolonged corticosterone (CORT) exposure, given either alone or in combination with an antidepressant drug, the selective serotonin reuptake inhibitor fluoxetine. Our results indicate that the constitutive deficiency of Cx43 resulted in the expression of some characteristic hallmarks of antidepressant-/anxiolytic-like behavioral activities along with an improvement of cognitive performances. Moreover, in a new cohort of wild-type mice, we showed that CORT exposure elicited anxiety and depression-like abnormalities that were reversed by chronic administration of fluoxetine. Remarkably, CORT also increased hippocampal amounts of phosphorylated form of Cx43 whereas fluoxetine treatment normalized this parameter. From these results, we envision that antidepressant drugs may exert their therapeutic activity by decreasing the expression and/or activity of Cx43 resulting from a lower level of phosphorylation in the hippocampus.
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Affiliation(s)
- Gaël Quesseveur
- Institut National de la Santé et de la Recherche Médicale UMR-S 1178 - Dépression, Plasticité and Résistance Aux Antidépresseurs, Laboratoire de Neuropharmacologie EA 3544, Faculté de Pharmacie, Université Paris-Sud Châtenay-Malabry, France
| | - Benjamin Portal
- Centre National de la Recherche Scientifique, Centre de Recherches sur la Cognition Animale UMR 5169, Centre de Biologie Intégrative, Université Toulouse III- Paul Sabatier Toulouse, France
| | - Jean-Arnaud Basile
- Centre National de la Recherche Scientifique, Centre de Recherches sur la Cognition Animale UMR 5169, Centre de Biologie Intégrative, Université Toulouse III- Paul Sabatier Toulouse, France
| | - Pascal Ezan
- Center for Interdisciplinary Research in Biology, Centre National de la Recherche Scientifique UMR 7241, Collège de France Paris, France
| | - Alexia Mathou
- Centre des Sciences du Goût et de l'Alimentation - Centre National de la Recherche Scientifique UMR 6265 - Institut National de la Recherche Agronomique UMR 1324, Université de Bourgogne Dijon, France
| | - Hélène Halley
- Centre National de la Recherche Scientifique, Centre de Recherches sur la Cognition Animale UMR 5169, Centre de Biologie Intégrative, Université Toulouse III- Paul Sabatier Toulouse, France
| | - Corinne Leloup
- Centre des Sciences du Goût et de l'Alimentation - Centre National de la Recherche Scientifique UMR 6265 - Institut National de la Recherche Agronomique UMR 1324, Université de Bourgogne Dijon, France
| | - Xavier Fioramonti
- Centre des Sciences du Goût et de l'Alimentation - Centre National de la Recherche Scientifique UMR 6265 - Institut National de la Recherche Agronomique UMR 1324, Université de Bourgogne Dijon, France
| | - Nicole Déglon
- Laboratory of Cellular and Molecular Neurotherapies, Department of Clinical Neurosciences, Centre Hospitalier Universitaire Vaudois Lausanne, Switzerland
| | - Christian Giaume
- Center for Interdisciplinary Research in Biology, Centre National de la Recherche Scientifique UMR 7241, Collège de France Paris, France
| | - Claire Rampon
- Centre National de la Recherche Scientifique, Centre de Recherches sur la Cognition Animale UMR 5169, Centre de Biologie Intégrative, Université Toulouse III- Paul Sabatier Toulouse, France
| | - Bruno P Guiard
- Institut National de la Santé et de la Recherche Médicale UMR-S 1178 - Dépression, Plasticité and Résistance Aux Antidépresseurs, Laboratoire de Neuropharmacologie EA 3544, Faculté de Pharmacie, Université Paris-SudChâtenay-Malabry, France; Centre National de la Recherche Scientifique, Centre de Recherches sur la Cognition Animale UMR 5169, Centre de Biologie Intégrative, Université Toulouse III- Paul SabatierToulouse, France
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Camilleri G, Portal B, Quiniou G, Clerson P. [Comparison of the antihypertensive efficacy of and tolerance to 2 imidazoline receptor agonists: moxonidine and rilmenidine in monotherapy]. Ann Cardiol Angeiol (Paris) 2001; 50:169-74. [PMID: 12555509 DOI: 10.1016/s0003-3928(01)00017-8] [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: 11/22/2022]
Abstract
Two hundreds mild to moderate hypertensive patients (mean age 54 +/- 10, 115 males, 85 females) were randomised in a multicentre, double blind, two parallel groups trial in order to compare the efficacy of moxonidine (0.2 mg od) and rilmenidine (1 mg od), two selective I1 receptor agonists. The dosage had to be shifted after a four-week treatment period (moxonidine 0.4 mg od or rilmenidine 2 mg bid) if DBP > 90 mmHg. More than half of the patients had to be shifted to a double dose. The blood pressure was normalised (DBP < or = 90 mmHg) for 47% of the moxonidine patient's and 50% of the rilmenidine patients. The DBP decrease reached 7.3 mmHg in the moxonidine group and 8.0 mmHg in the rilmenidine group (P = 0.28). The SBP decrease was the same in the two groups (7.6 mmHg). Both drugs were well tolerated. The great affinity of moxonidine and rilmenidine for the I1 receptors and the weak affinity for the alpha 2 receptors were probably responsible of the small number of adverse events which are generally linked to the centrally acting antihypertensive drugs (asthenia, somnolence, oedema). Because moxonidine and rilmenidine are often to be prescribed at double dose and are often associated with other antihypertensives, moxonidine whose dosage could be shifted without having to increase the number of daily intakes could enhance the patient's comfort and make the compliance easier.
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Affiliation(s)
- G Camilleri
- Service de médecine interne et des maladies métaboliques et vasculaires, hôpital d'instruction des armées Robert Picqué, BP 28, 33998 Bordeaux Armées, France
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Portal B. [Perinatal networks--operation in the Centre region]. Arch Pediatr 2000; 6 Suppl 2:220s-221s. [PMID: 10370486 DOI: 10.1016/s0929-693x(99)80418-7] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- B Portal
- Centre hospitalier Jacques-Caeur, Bourges, France
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Dyer CB, Gleason MS, Murphy KP, Pavlik VN, Portal B, Regev T, Hyman DJ. Treating elder neglect: collaboration between a geriatrics assessment team and adult protective services. South Med J 1999; 92:242-4. [PMID: 10071677] [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
Neglect is the most common type of elder maltreatment in the United States. Currently, the only formal intervention available is provided by each state's adult protective service agency (APS). Elder neglect involves a complicated relationship among an indvidual's medical problems, social situation, and ability to function in the environment. Geriatric assessment teams are facile at dealing with such complex cases while APS caseworkers are expert in their ability to identify and confirm neglect. Forming a geriatric team that includes APS caseworkers is a logical and innovative approach to the growing problem of elder neglect.
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Affiliation(s)
- C B Dyer
- Department of Internal Medicine, Baylor College of Medicine, Houston, TX 77004, USA
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Portal B, Van Gossum A, Le Moine O, Van Gossum M, Carpentier Y, Nève J. O.14 Increased resistance of erythrocytes to lipid peroxidationrelated to lipid composition of erythrocyte membranes in alcoholic cirrhosis. Clin Nutr 1996. [DOI: 10.1016/s0261-5614(96)80061-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Van Gossum A, Portal B, Le Moine O, Van Gossum M, Vanderpas J, Caroentier Y, Nève J. O.34 Effect of oral selenium supplementation on peroxidative and immunological parameters in patients with alcohol-related cirrhosis. Clin Nutr 1996. [DOI: 10.1016/s0261-5614(96)80081-1] [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: 11/24/2022]
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Portal B, Richard MJ, Coudray C, Arnaud J, Favier A. Effect of double-blind cross-over selenium supplementation on lipid peroxidation markers in cystic fibrosis patients. Clin Chim Acta 1995; 234:137-46. [PMID: 7758213 DOI: 10.1016/0009-8981(94)05991-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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: 01/27/2023]
Abstract
Lipid peroxidation was assessed in 27 cystic fibrosis children during a double-blind selenium supplementation study (2.8 micrograms of sodium selenite per kg per day) with a placebo control and inversion of treatment periods. Simultaneously, 17 healthy children living in the same area were also investigated as control subjects. Before any treatment whatsoever and despite a selenium status close to those of control subjects, cystic fibrosis patients showed significant increase in plasma lipid peroxidation markers. Thiobarbituric acid reactants (TBARs) were normalized after the first treatment period of 5 months in both cystic fibrosis groups receiving either selenium supplementation or placebo. In this latter group, TBARs were reduced despite a significant decrease in plasma selenium concentrations as compared with the control group. Organic hydroperoxide concentrations were also simultaneously normalized in both cystic fibrosis groups at the end of the second treatment period. These results showed that improvement of lipid peroxidation markers was not related to the selenium supplementation. Nevertheless, oxidative stress sustained by cystic fibrosis children must be taken into account so that it does not aggravate the prognosis of the disease.
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Affiliation(s)
- B Portal
- Laboratoire de Biochimie, Groupe de Recherche sur Ies pathologies oxydatives GREPO, La Tronche, France
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17
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Portal B, Richard MJ, Ducros V, Aguilaniu B, Brunel F, Faure H, Gout JP, Bost M, Favier A. Effect of double-blind crossover selenium supplementation on biological indices of selenium status in cystic fibrosis patients. Clin Chem 1993; 39:1023-8. [PMID: 8504531] [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: 01/31/2023]
Abstract
Twenty-seven cystic fibrosis patients received selenium supplementation (2.8 micrograms of sodium selenite per kilogram of body weight per day) or a placebo. This 5-month trial was conducted as a double-blind, placebo-controlled study. After an interval of 2 months, treatments of the two groups were interchanged (crossed over) for another 5-month period. A group of healthy subjects, living in the same area, was investigated simultaneously. No selenium deficiency was found either in plasma or in erythrocytes before the supplementation. This result was inconsistent with a previous study performed in 1988 in our laboratory. This change in selenium status can be explained by progress in the nutritional nursing care of children and by the addition of selenium to the diet. During the study, selenium concentrations in plasma decreased when patients received placebo treatment and increased during selenium intake. In one of the two groups a similar variation was found for glutathione peroxidase activities in plasma and erythrocytes, whereas erythrocyte selenium was normal and did not change in any group. Nowadays, in the Grenoble area, the selenium status of cystic fibrosis patients is close to normal. Nevertheless, this study indicates a fragile equilibrium, given that selenium concentrations cn be lowered by placebo or mildly increased by supplementation.
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Affiliation(s)
- B Portal
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
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18
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Portal B, Richard MJ, Ducros V, Aguilaniu B, Brunel F, Faure H, Gout JP, Bost M, Favier A. Effect of double-blind crossover selenium supplementation on biological indices of selenium status in cystic fibrosis patients. Clin Chem 1993. [DOI: 10.1093/clinchem/39.6.1023] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Twenty-seven cystic fibrosis patients received selenium supplementation (2.8 micrograms of sodium selenite per kilogram of body weight per day) or a placebo. This 5-month trial was conducted as a double-blind, placebo-controlled study. After an interval of 2 months, treatments of the two groups were interchanged (crossed over) for another 5-month period. A group of healthy subjects, living in the same area, was investigated simultaneously. No selenium deficiency was found either in plasma or in erythrocytes before the supplementation. This result was inconsistent with a previous study performed in 1988 in our laboratory. This change in selenium status can be explained by progress in the nutritional nursing care of children and by the addition of selenium to the diet. During the study, selenium concentrations in plasma decreased when patients received placebo treatment and increased during selenium intake. In one of the two groups a similar variation was found for glutathione peroxidase activities in plasma and erythrocytes, whereas erythrocyte selenium was normal and did not change in any group. Nowadays, in the Grenoble area, the selenium status of cystic fibrosis patients is close to normal. Nevertheless, this study indicates a fragile equilibrium, given that selenium concentrations cn be lowered by placebo or mildly increased by supplementation.
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Affiliation(s)
- B Portal
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - M J Richard
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - V Ducros
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - B Aguilaniu
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - F Brunel
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - H Faure
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - J P Gout
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - M Bost
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
| | - A Favier
- Laboratoire de Biochimie, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France
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Richard MJ, Portal B, Meo J, Coudray C, Hadjian A, Favier A. Malondialdehyde kit evaluated for determining plasma and lipoprotein fractions that react with thiobarbituric acid. Clin Chem 1992; 38:704-9. [PMID: 1582024] [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: 12/27/2022]
Abstract
The determination of thiobarbituric acid reactants (TBARs) is a widely used method for investigating overall lipid peroxidation. An assay kit that could be used with plasma and lipid fractions would facilitate standardization of the method. The results reported here indicate that the malondialdehyde (MDA) kit manufactured by Sobioda (Grenoble, France) complies with criteria of good analytical practices. The detection limit was 0.11 mumol of MDA per liter of plasma. The within-run (CV = 1.8-3.3%) and between-run (CV = 3.3-4.4%) precisions were acceptable. The analytical recovery of MDA after supplementing human plasma samples with tetraethoxypropane standards varied from 88% to 100%. The mean (SD) lipoperoxide concentration determined in 32 healthy adults, ages 20-40 years, was 2.51 (0.25) mumol/L. No significant sex-related difference was noted: 2.57 (0.28) in men vs 2.44 (0.20) mumol/L in women. Applying the method to lipid fractions showed that lipoprotein fractions contain relatively little MDA: 0.07 (0.03) mumol/L of plasma for very-low-density lipoproteins and 0.19 (0.10) mumol/L for low-density lipoproteins.
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Affiliation(s)
- M J Richard
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
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Richard MJ, Portal B, Meo J, Coudray C, Hadjian A, Favier A. Malondialdehyde Kit Evaluated for Determining Plasma and Lipoprotein Fractions that React with Thiobarbituric Acid. Clin Chem 1992. [DOI: 10.1093/clinchem/38.5.704] [Citation(s) in RCA: 216] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
The determination of thiobarbituric acid reactants (TBARs) is a widely used method for investigating overall lipid peroxidation. An assay kit that could be used with plasma and lipid fractions would facilitate standardization of the method. The results reported here indicate that the malondialdehyde (MDA) kit manufactured by Sobioda (Grenoble, France) complies with criteria of good analytical practices. The detection limit was 0.11 mumol of MDA per liter of plasma. The within-run (CV = 1.8-3.3%) and between-run (CV = 3.3-4.4%) precisions were acceptable. The analytical recovery of MDA after supplementing human plasma samples with tetraethoxypropane standards varied from 88% to 100%. The mean (SD) lipoperoxide concentration determined in 32 healthy adults, ages 20-40 years, was 2.51 (0.25) mumol/L. No significant sex-related difference was noted: 2.57 (0.28) in men vs 2.44 (0.20) mumol/L in women. Applying the method to lipid fractions showed that lipoprotein fractions contain relatively little MDA: 0.07 (0.03) mumol/L of plasma for very-low-density lipoproteins and 0.19 (0.10) mumol/L for low-density lipoproteins.
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Affiliation(s)
- M J Richard
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
| | - B Portal
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
| | - J Meo
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
| | - C Coudray
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
| | - A Hadjian
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
| | - A Favier
- Laboratoire de Biochimie C, Centre Hospitalier Régional Universitaire A, Grenoble, France
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Hardel PJ, de Lajudie JP, Portal B, Ville G, Guilloux L, D'Athis P. [Allergy to Thyrophagus putrescentiae and Lepidoglyphus destructor in a population of young asthmatic adults]. Allerg Immunol (Paris) 1987; 19:399-402, 404-5. [PMID: 3453125] [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: 01/05/2023]
Abstract
In the present work a study has been made of the prevalence of allergy to two storage mites, Tyrophagus putrescentiae and Lepidoglyphus destructor in a population of 105 young adults in the east of France. Combination of skin tests and specific IgE measurements shows that 43.10% of the subjects were sensitive to Tyrophagus and 44.95% to Lepidoglyphus. Interpretation of skin tests remains uncertain, particularly concerning the source of the allergen used and it is most often also necessary to measure the specific serum IgE. As in many studies, most sensitization was found amongst farmers. In contrast, no difference was seen between rural and city dwellers, subjects who were in contact with small animals and those in contact with food for livestock if they were not farmers, not between declared asthmatics who lived in a humid place and those who lived in an environment that was drier. Certainly these mites appeared in the present study to be much more ubiquitous than supposed previously and the fact that they seemed to be carriers of allergens and antigens that were different from those of Dermatophagoides raises the question as to whether the need for hyposensitization treatment for them has been under-estimated.
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Hardel PJ, De Lajudie JP, Portal B, Ville G, Guilloux L, D'Athis P. [Allergy to Tyrophagus putrescentiae and Lepidoglyphus destructor in a population of young adult asthmatics]. Allerg Immunol (Paris) 1986; 18:25-32. [PMID: 3453717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The goal of this work was the study of the prevalence of allergy to two mites, Tyrophagus putrescentiae and Lepidoglyphus destructor in a population of 105 young asthmatic men from East of France. The association of skin tests and specific IgE shows that 43.10% are allergic to Tyrophagus and 44.95% to Lepidoglyphus destructor. The significance of skin tests is doubtful and depends on the laboratories which provide the allergens. Therefore, specific IgE has to be performed. As in other studies it has been observed that farmers are very often sensitized. But, nose difference has been noticed between people living in town or in country, between those having contacts with pets or not, feeding the cattle or not (except for the farmers). In the same way, no difference has been noticed between the asthmatics living in a wet country and/or wet house and those living in a dry area.
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Suzanne F, Fresne JJ, Portal B, Baudon J. [Testing indometacin as a preventive of premature labour (author's transl)]. Therapie 1979; 34:751-60. [PMID: 547449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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