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Anagnostopoulos G, Saavedra E, Lambertucci F, Motiño O, Dimitrov J, Roiz-Valle D, Quesada V, Alvarez-Valadez K, Chen H, Sauvat A, Rong Y, Nogueira-Recalde U, Li S, Montégut L, Djavaheri-Mergny M, Castedo M, Lopez-Otin C, Maiuri MC, Martins I, Kroemer G. Inhibition of acyl-CoA binding protein (ACBP) by means of a GABA ARγ2-derived peptide. Cell Death Dis 2024; 15:249. [PMID: 38582872 PMCID: PMC10998878 DOI: 10.1038/s41419-024-06633-6] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 03/15/2024] [Accepted: 03/25/2024] [Indexed: 04/08/2024]
Abstract
Acyl-CoA binding protein (ACBP) encoded by diazepam binding inhibitor (DBI) is an extracellular inhibitor of autophagy acting on the gamma-aminobutyric acid A receptor (GABAAR) γ2 subunit (GABAARγ2). Here, we show that lipoanabolic diets cause an upregulation of GABAARγ2 protein in liver hepatocytes but not in other major organs. ACBP/DBI inhibition by systemically injected antibodies has been demonstrated to mediate anorexigenic and organ-protective, autophagy-dependent effects. Here, we set out to develop a new strategy for developing ACBP/DBI antagonists. For this, we built a molecular model of the interaction of ACBP/DBI with peptides derived from GABAARγ2. We then validated the interaction between recombinant and native ACBP/DBI protein and a GABAARγ2-derived eicosapeptide (but not its F77I mutant) by pull down experiments or surface plasmon resonance. The GABAARγ2-derived eicosapeptide inhibited the metabolic activation of hepatocytes by recombinant ACBP/DBI protein in vitro. Moreover, the GABAARγ2-derived eicosapeptide (but not its F77I-mutated control) blocked appetite stimulation by recombinant ACBP/DBI in vivo, induced autophagy in the liver, and protected mice against the hepatotoxin concanavalin A. We conclude that peptidomimetics disrupting the interaction between ACBP/DBI and GABAARγ2 might be used as ACBP/DBI antagonists. This strategy might lead to the future development of clinically relevant small molecules of the ACBP/DBI system.
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Affiliation(s)
- Gerasimos Anagnostopoulos
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Ester Saavedra
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Departamento de Bioquímica y Biología Molecular, Fisiología, Genética e Inmunología, Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS), Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Paris, Spain
| | - Flavia Lambertucci
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Omar Motiño
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Jordan Dimitrov
- Centre de Recherche des Cordeliers, INSERM, CNRS, Sorbonne Université, Université Paris Cité, Paris, France
| | - David Roiz-Valle
- Departamento de Bioquímica y Biología Molecular, Instituto Universitario de Oncología (IUOPA), Universidad de Oviedo, Oviedo, Spain
| | - Victor Quesada
- Departamento de Bioquímica y Biología Molecular, Instituto Universitario de Oncología (IUOPA), Universidad de Oviedo, Oviedo, Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, Spain
| | - Karla Alvarez-Valadez
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Hui Chen
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Allan Sauvat
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Yan Rong
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Uxía Nogueira-Recalde
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Grupo de Investigación en Reumatología (GIR), Instituto de Investigación Biomédica de (INIBIC), Fundación Profesor Novoa Santos, A Coruña, Spain
| | - Sijing Li
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Léa Montégut
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Mojgan Djavaheri-Mergny
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Maria Castedo
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Carlos Lopez-Otin
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Departamento de Bioquímica y Biología Molecular, Instituto Universitario de Oncología (IUOPA), Universidad de Oviedo, Oviedo, Spain
- Facultad de Ciencias de la Vida y la Naturaleza, Universidad Nebrija, Madrid, Spain
| | - Maria Chiara Maiuri
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Department of Molecular Medicine and Medical Biotechnologies, University of Napoli Federico II, 80131, Naples, Italy
| | - Isabelle Martins
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France.
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France.
| | - Guido Kroemer
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France.
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France.
- Institut du Cancer Paris CARPEM, Department of Biology, Hôpital Européen Georges Pompidou, AP-HP, Paris, France.
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He Y, Li J, Yi L, Li X, Luo M, Pang Y, Wang M, Li Z, Xu M, Dong Z, Du Y. Octadecaneuropeptide Ameliorates Cognitive Impairments Through Inhibiting Oxidative Stress in Alzheimer's Disease Models. J Alzheimers Dis 2023; 92:1413-1426. [PMID: 36911940 DOI: 10.3233/jad-221115] [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] [Indexed: 03/09/2023]
Abstract
BACKGROUND Alzheimer's disease (AD) is a neurodegenerative disorder characterized by amyloid-β peptide (Aβ) deposition. Aβ accumulation induces oxidative stress, leading to mitochondrial dysfunction, apoptosis, and so forth. Octadecaneuropeptide (ODN), a diazepam-binding inhibitor (DBI)-derived peptide, has been reported to have antioxidant properties. However, it is unclear whether ODN has neuroprotective effects in AD. OBJECTIVE To profile the potential effects of ODN on AD. METHODS We established a mouse model of AD via microinjection of Aβ in the lateral ventricle. Utilizing a combination of western blotting assays, electrophysiological recordings, and behavioral tests, we investigated the neuroprotective effects of ODN on AD. RESULTS DBI expression was decreased in AD model mice and cells. Meanwhile, ODN decreased Aβ generation by downregulating amyloidogenic AβPP processing in HEK-293 cells stably expressing human Swedish mutant APP695 and BACE1 (2EB2). Moreover, ODN could inhibit Aβ-induced oxidative stress in primary cultured cells and mice, as reflected by a dramatic increase in antioxidants and a decrease in pro-oxidants. We also found that ODN could reduce oxidative stress-induced apoptosis by restoring mitochondrial membrane potential, intracellular Ca2+ and cleaved caspase-3 levels in Aβ-treated primary cultured cells and mice. More importantly, intracerebroventricular injection of ODN attenuated cognitive impairments as well as long-term potentiation in Aβ-treated mice. CONCLUSION These results suggest that ODN may exert a potent neuroprotective effect against Aβ-induced neurotoxicity and memory decline via its antioxidant effects, indicating that ODN may be a potential therapeutic agent for AD.
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Affiliation(s)
- Yan He
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Junjie Li
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Liling Yi
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaohuan Li
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Man Luo
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Yayan Pang
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Maoju Wang
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Zhaolun Li
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Mingliang Xu
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Zhifang Dong
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Yehong Du
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
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Roy SC, Sapkota S, Pasula MB, Bheemanapally K, Briski KP. Diazepam Binding Inhibitor Control of Eu- and Hypoglycemic Patterns of Ventromedial Hypothalamic Nucleus Glucose-Regulatory Signaling. ASN Neuro 2023; 15:17590914231214116. [PMID: 38031405 PMCID: PMC10687944 DOI: 10.1177/17590914231214116] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 10/20/2023] [Accepted: 10/28/2023] [Indexed: 12/01/2023] Open
Abstract
Pharmacological stimulation/antagonism of astrocyte glio-peptide octadecaneuropeptide signaling alters ventromedial hypothalamic nucleus (VMN) counterregulatory γ-aminobutyric acid (GABA) and nitric oxide transmission. The current research used newly developed capillary zone electrophoresis-mass spectrometry methods to investigate hypoglycemia effects on VMN octadecaneuropeptide content, along with gene knockdown tools to determine if octadecaneuropeptide signaling regulates these transmitters during eu- and/or hypoglycemia. Hypoglycemia caused dissimilar adjustments in the octadecaneuropeptide precursor, i.e., diazepam-binding-inhibitor and octadecaneuropeptide levels in dorsomedial versus ventrolateral VMN. Intra-VMN diazepam-binding-inhibitor siRNA administration decreased baseline 67 and 65 kDa glutamate decarboxylase mRNA levels in GABAergic neurons laser-microdissected from each location, but only affected hypoglycemic transcript expression in ventrolateral VMN. This knockdown therapy imposed dissimilar effects on eu- and hypoglycemic glucokinase and 5'-AMP-activated protein kinase-alpha1 (AMPKα1) and -alpha2 (AMPKα2) gene profiles in dorsomedial versus ventrolateral GABAergic neurons. Diazepam-binding-inhibitor gene silencing up-regulated baseline (dorsomedial) or hypoglycemic (ventrolateral) nitrergic neuron neuronal nitric oxide synthase mRNA profiles. Baseline nitrergic cell glucokinase mRNA was up- (ventrolateral) or down- (dorsomedial) regulated by diazepam-binding-inhibitor siRNA, but knockdown enhanced hypoglycemic profiles in both sites. Nitrergic nerve cell AMPKα1 and -α2 transcripts exhibited division-specific responses to this genetic manipulation during eu- and hypoglycemia. Results document the utility of capillary zone electrophoresis-mass spectrometric tools for quantification of ODN in small-volume brain tissue samples. Data show that hypoglycemia has dissimilar effects on ODN signaling in the two major neuroanatomical divisions of the VMN and that this glio-peptide imposes differential control of glucose-regulatory neurotransmission in the VMNdm versus VMNvl during eu- and hypoglycemia.
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Affiliation(s)
- Sagor C. Roy
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, LA, USA
| | - Subash Sapkota
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, LA, USA
| | - Madhu Babu Pasula
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, LA, USA
| | - Khaggeswar Bheemanapally
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, LA, USA
| | - Karen P. Briski
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, LA, USA
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4
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Joseph A, Chen H, Anagnostopoulos G, Montégut L, Lafarge A, Motiño O, Castedo M, Maiuri MC, Clément K, Terrisse S, Martin AL, Vaz-Luis I, Andre F, Grundler F, de Toledo FW, Madeo F, Zitvogel L, Goldwasser F, Blanchet B, Fumeron F, Roussel R, Martins I, Kroemer G. Effects of acyl-coenzyme A binding protein (ACBP)/diazepam-binding inhibitor (DBI) on body mass index. Cell Death Dis 2021; 12:599. [PMID: 34108446 PMCID: PMC8190068 DOI: 10.1038/s41419-021-03864-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/05/2021] [Accepted: 05/17/2021] [Indexed: 12/16/2022]
Abstract
In mice, the plasma concentrations of the appetite-stimulatory and autophagy-inhibitory factor acyl-coenzyme A binding protein (ACBP, also called diazepam-binding inhibitor, DBI) acutely increase in response to starvation, but also do so upon chronic overnutrition leading to obesity. Here, we show that knockout of Acbp/Dbi in adipose tissue is sufficient to prevent high-fat diet-induced weight gain in mice. We investigated ACBP/DBI plasma concentrations in several patient cohorts to discover a similar dual pattern of regulation. In relatively healthy subjects, ACBP/DBI concentrations independently correlated with body mass index (BMI) and age. The association between ACBP/DBI and BMI was lost in subjects that underwent major weight gain in the subsequent 3-9 years, as well as in advanced cancer patients. Voluntary fasting, undernutrition in the context of advanced cancer, as well as chemotherapy were associated with an increase in circulating ACBP/DBI levels. Altogether, these results support the conclusion that ACBP/DBI may play an important role in body mass homeostasis as well as in its failure.
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Affiliation(s)
- Adrien Joseph
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Hui Chen
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Gerasimos Anagnostopoulos
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Léa Montégut
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Antoine Lafarge
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
| | - Omar Motiño
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Maria Castedo
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Maria Chiara Maiuri
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Karine Clément
- INSERM, NutriOmics Research Unit, Sorbonne Université, Paris, France
- Assistance Publique Hôpitaux de Paris, Nutrition Departement, Pitié-Salpêtrière Hospital, Sorbonne Université, 47-83 bd de l'Hôpital, 75013, Paris, France
| | - Safae Terrisse
- Department of Medical Oncology, Saint-Louis Hospital, Paris Descartes University, AP-HP, Paris, France
| | | | - Ines Vaz-Luis
- INSERM Unit 981, Gustave Roussy, Cancer Campus, Villejuif, France
- Medical Oncology, Gustave Roussy, Cancer Campus, Villejuif, France
| | - Fabrice Andre
- INSERM Unit 981, Gustave Roussy, Cancer Campus, Villejuif, France
- Medical Oncology, Gustave Roussy, Cancer Campus, Villejuif, France
| | | | | | - Frank Madeo
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Laurence Zitvogel
- Faculté de Médecine, Université de Paris Saclay, Kremlin Bicêtre, Paris, France
- INSERM U1015, Gustave Roussy, Cancer Campus, 94800, Villejuif, France
- INSERM CICBT1428, Centre d'Investigation Clinique-Biothérapie, 94800, Villejuif, France
| | - François Goldwasser
- Department of Medical Oncology, Cochin Hospital, AP-HP, Paris, France
- URP4466, Paris University, Paris, France
| | - Benoit Blanchet
- Pharmacokinetics and Pharmacochemistry Unit, Cochin Hospital, Paris Descartes University, CARPEM, AP-HP, Paris, France
- UMR8038 CNRS, U1268 INSERM, Faculty of Pharmacy, University of Paris, PRES Sorbonne Paris Cité, CARPEM, 75006, Paris, France
| | - Frédéric Fumeron
- Centre de Recherche des Cordeliers, UMR-S 1138, INSERM, Université de Paris, Paris, France
| | - Ronan Roussel
- Centre de Recherche des Cordeliers, UMR-S 1138, INSERM, Université de Paris, Paris, France
- Department of Diabetology, Endocrinology, Nutrition, AP-HP, Bichat Hospital, Paris, France
| | - Isabelle Martins
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France.
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France.
| | - Guido Kroemer
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Inserm U1138, Université de Paris, Sorbonne Université, Paris, France.
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France.
- Institut Universitaire de France, Paris, France.
- Department of Physiology, University Complutense of Madrid, Madrid, Spain.
- Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France.
- Suzhou Institute for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China.
- Karolinska Institute, Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden.
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5
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Namsi A, Nury T, Khan AS, Leprince J, Vaudry D, Caccia C, Leoni V, Atanasov AG, Tonon MC, Masmoudi-Kouki O, Lizard G. Octadecaneuropeptide (ODN) Induces N2a Cells Differentiation through a PKA/PLC/PKC/MEK/ERK-Dependent Pathway: Incidence on Peroxisome, Mitochondria, and Lipid Profiles. Molecules 2019; 24:molecules24183310. [PMID: 31514417 PMCID: PMC6767053 DOI: 10.3390/molecules24183310] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 08/28/2019] [Accepted: 09/05/2019] [Indexed: 12/29/2022] Open
Abstract
Neurodegenerative diseases are characterized by oxidative stress, mitochondrial damage, and death of neuronal cells. To counteract such damage and to favor neurogenesis, neurotrophic factors could be used as therapeutic agents. Octadecaneuropeptide (ODN), produced by astrocytes, is a potent neuroprotective agent. In N2a cells, we studied the ability of ODN to promote neuronal differentiation. This parameter was evaluated by phase contrast microscopy, staining with crystal violet, cresyl blue, and Sulforhodamine 101. The effect of ODN on cell viability and mitochondrial activity was determined with fluorescein diacetate and DiOC6(3), respectively. The impact of ODN on the topography of mitochondria and peroxisomes, two tightly connected organelles involved in nerve cell functions and lipid metabolism, was evaluated by transmission electron microscopy and fluorescence microscopy: detection of mitochondria with MitoTracker Red, and peroxisome with an antibody directed against the ABCD3 peroxisomal transporter. The profiles in fatty acids, cholesterol, and cholesterol precursors were determined by gas chromatography, in some cases coupled with mass spectrometry. Treatment of N2a cells with ODN (10-14 M, 48 h) induces neurite outgrowth. ODN-induced neuronal differentiation was associated with modification of topographical distribution of mitochondria and peroxisomes throughout the neurites and did not affect cell viability and mitochondrial activity. The inhibition of ODN-induced N2a differentiation with H89, U73122, chelerythrine and U0126 supports the activation of a PKA/PLC/PKC/MEK/ERK-dependent signaling pathway. Although there is no difference in fatty acid profile between control and ODN-treated cells, the level of cholesterol and some of its precursors (lanosterol, desmosterol, lathosterol) was increased in ODN-treated cells. The ability of ODN to induce neuronal differentiation without cytotoxicity reinforces the interest for this neuropeptide with neurotrophic properties to overcome nerve cell damage in major neurodegenerative diseases.
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Affiliation(s)
- Amira Namsi
- Team Bio-PeroxIL, Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism (EA7270)/University Bourgogne Franche-Comté (UBFC)/Inserm, 21000 Dijon, France.
- Faculty of Science of Tunis, University Tunis El Manar, LR18ES03, Laboratory of Neurophysiology, Cellular Physiopathology and Biomolecules Valorisation, Tunis 2092, Tunisia.
| | - Thomas Nury
- Team Bio-PeroxIL, Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism (EA7270)/University Bourgogne Franche-Comté (UBFC)/Inserm, 21000 Dijon, France.
| | - Amira S Khan
- Physiology of Nutrition & Toxicology (NUTox), Inserm U1231, University UBFC, 21000 Dijon, France.
| | - Jérôme Leprince
- UNIROUEN, Inserm U1239, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, Normandie University, 76000 Rouen, France.
- UNIROUEN, Regional Cell Imaging Platform of Normandy (PRIMACEN), Normandie University, 76000 Rouen, France.
| | - David Vaudry
- UNIROUEN, Inserm U1239, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, Normandie University, 76000 Rouen, France.
- UNIROUEN, Regional Cell Imaging Platform of Normandy (PRIMACEN), Normandie University, 76000 Rouen, France.
| | - Claudio Caccia
- Laboratory of Medical Genetics and Neurogenetics, Foundation IRCCS Istituto Neurologico Carlo Besta, 20100 Milan, Italy.
| | - Valerio Leoni
- Laboratory of Clinical Chemistry, Hospital of Varese, ASST-Settelaghi, 20100 Milan, Italy.
| | - Atanas G Atanasov
- Institute of Genetics and Animal Breeding of the Polish Academy of Sciences, Jastrzebiec, 05-552 Magdalenka, Poland.
- Department of Pharmacognosy, University of Vienna, 1010 Vienna, Austria.
- Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev str., 1113 Sofia, Bulgaria.
| | - Marie-Christine Tonon
- UNIROUEN, Inserm U1239, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, Normandie University, 76000 Rouen, France.
| | - Olfa Masmoudi-Kouki
- Faculty of Science of Tunis, University Tunis El Manar, LR18ES03, Laboratory of Neurophysiology, Cellular Physiopathology and Biomolecules Valorisation, Tunis 2092, Tunisia.
| | - Gérard Lizard
- Team Bio-PeroxIL, Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism (EA7270)/University Bourgogne Franche-Comté (UBFC)/Inserm, 21000 Dijon, France.
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Hamdi Y, Kaddour H, Vaudry D, Leprince J, Zarrouk A, Hammami M, Vaudry H, Tonon MC, Amri M, Masmoudi-Kouki O. Octadecaneuropeptide ODN prevents hydrogen peroxide-induced oxidative damage of biomolecules in cultured rat astrocytes. Peptides 2015; 71:56-65. [PMID: 26143507 DOI: 10.1016/j.peptides.2015.06.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 06/05/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
Abstract
Oxidative stress, associated with a variety of disorders including neurodegenerative diseases, is a major cause of cellular dysfunction and biomolecule damages which play a crucial role in neuronal apoptosis. Astrocytes specifically synthesize and release endozepines, a family of regulatory peptides, including the octadecaneuropeptide ODN. We have recently shown that ODN is a potent glioprotective agent that prevents hydrogen peroxide (H2O2)-induced oxidative stress and apoptosis. The purpose of the present study was to investigate the potential protective effect of ODN on oxidative-generated damage of biomolecules in cultured rat astrocytes. Incubation of cells with subnanomolar concentrations of ODN (0.1fM-0.1nM) inhibited H2O2-evoked reactive oxygen species accumulation and cell death in a concentration-dependent manner. Exposure of H2O2-treated cells to 0.1nM ODN inhibited superoxide anion generation and blocked oxidative damage of cell molecules caused by H2O2i.e. formation and accumulation of lipid oxidation products, malondialdehydes and conjugated dienes, and protein carbonyl compounds. Taken together, these data demonstrate for the first time that ODN prevents oxidative stress-induced alteration of cellular constituents. ODN is thus a potential candidate to reduce neuronal damage in various pathological conditions involving oxidative neurodegeneration.
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Affiliation(s)
- Yosra Hamdi
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, 2092 Tunis, Tunisia
| | - Hadhemi Kaddour
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, 2092 Tunis, Tunisia; CIRB, CNRS UMR 7241, INSERM U1050, College de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France; Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Sorbonne Paris City, 75205 Paris Cedex, France
| | - David Vaudry
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, 76128, Mont-Saint-Aignan, France; Regional Platform for Cell Imaging of Haute-Normandie (PRIMACEN), Institute for Biomedical Research and Innovation, University of Rouen, Mont-Saint-Aignan, France
| | - Jérôme Leprince
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, 76128, Mont-Saint-Aignan, France; Regional Platform for Cell Imaging of Haute-Normandie (PRIMACEN), Institute for Biomedical Research and Innovation, University of Rouen, Mont-Saint-Aignan, France
| | - Amira Zarrouk
- UR12ES05, Laboratory of Nutrition-Functional Food & Vascular Health, Faculty of Medicine, University of Monastir, Monastir 5019, Tunisia
| | - Mohamed Hammami
- UR12ES05, Laboratory of Nutrition-Functional Food & Vascular Health, Faculty of Medicine, University of Monastir, Monastir 5019, Tunisia
| | - Hubert Vaudry
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, 76128, Mont-Saint-Aignan, France; Regional Platform for Cell Imaging of Haute-Normandie (PRIMACEN), Institute for Biomedical Research and Innovation, University of Rouen, Mont-Saint-Aignan, France
| | - Marie-Christine Tonon
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, 76128, Mont-Saint-Aignan, France
| | - Mohamed Amri
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, 2092 Tunis, Tunisia
| | - Olfa Masmoudi-Kouki
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, 2092 Tunis, Tunisia.
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Siejka A, Jankiewicz-Wika J, Stępień H, Fryczak J, Świętosławski J, Komorowski J. Reduced plasma level of diazepam-binding inhibitor (DBI) in patients with morbid obesity. Endocrine 2015; 49:859-62. [PMID: 25561371 PMCID: PMC4512568 DOI: 10.1007/s12020-014-0522-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 12/16/2014] [Indexed: 11/26/2022]
Affiliation(s)
- Agnieszka Siejka
- Department of Clinical Endocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
| | - Joanna Jankiewicz-Wika
- Department of Clinical Endocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
| | - Henryk Stępień
- Department of Immunoendocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425, Lodz, Poland
| | - Jolanta Fryczak
- Department of Immunoendocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425, Lodz, Poland
| | - Jacek Świętosławski
- Department of Neuroendocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
| | - Jan Komorowski
- Department of Clinical Endocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
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Hamdi Y, Kaddour H, Vaudry D, Bahdoudi S, Douiri S, Leprince J, Castel H, Vaudry H, Tonon MC, Amri M, Masmoudi-Kouki O. The octadecaneuropeptide ODN protects astrocytes against hydrogen peroxide-induced apoptosis via a PKA/MAPK-dependent mechanism. PLoS One 2012; 7:e42498. [PMID: 22927932 PMCID: PMC3424241 DOI: 10.1371/journal.pone.0042498] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Accepted: 07/06/2012] [Indexed: 12/18/2022] Open
Abstract
Astrocytes synthesize and release endozepines, a family of regulatory peptides, including the octadecaneuropeptide (ODN) an endogenous ligand of both central-type benzodiazepine (CBR) and metabotropic receptors. We have recently shown that ODN exerts a protective effect against hydrogen peroxide (H2O2)-induced oxidative stress in astrocytes. The purpose of the present study was to determine the type of receptor and the transduction pathways involved in the protective effect of ODN in cultured rat astrocytes. We have first observed a protective activity of ODN at very low concentrations that was abrogated by the metabotropic ODN receptor antagonist cyclo1–8[DLeu5]OP, but not by the CBR antagonist flumazenil. We have also found that the metabotropic ODN receptor is positively coupled to adenylyl cyclase in astrocytes and that the glioprotective action of ODN upon H2O2-induced astrocyte death is PKA- and MEK-dependent, but PLC/PKC-independent. Downstream of PKA, ODN induced ERK phosphorylation, which in turn activated the expression of the anti-apoptotic gene Bcl-2 and blocked the stimulation by H2O2 of the pro-apoptotic gene Bax. The effect of ODN on the Bax/Bcl-2 balance contributed to abolish the deleterious action of H2O2 on mitochondrial membrane integrity and caspase-3 activation. Finally, the inhibitory effect of ODN on caspase-3 activity was shown to be PKA and MEK-dependent. In conclusion, the present results demonstrate that the potent glioprotective action of ODN against oxidative stress involves the metabotropic ODN receptor coupled to the PKA/ERK-kinase pathway to inhibit caspase-3 activation.
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Affiliation(s)
- Yosra Hamdi
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
| | - Hadhemi Kaddour
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
| | - David Vaudry
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, Mont-Saint-Aignan, France
- International Associated Laboratory Samuel de Champlain, Mont-Saint-Aignan, France
- Regional Platform for Cell Imaging of Haute-Normandie (PRIMACEN), Institute for Medical Research and Innovation (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Seyma Bahdoudi
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
| | - Salma Douiri
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
| | - Jérôme Leprince
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, Mont-Saint-Aignan, France
- International Associated Laboratory Samuel de Champlain, Mont-Saint-Aignan, France
- Regional Platform for Cell Imaging of Haute-Normandie (PRIMACEN), Institute for Medical Research and Innovation (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Helene Castel
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, Mont-Saint-Aignan, France
| | - Hubert Vaudry
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, Mont-Saint-Aignan, France
- International Associated Laboratory Samuel de Champlain, Mont-Saint-Aignan, France
- Regional Platform for Cell Imaging of Haute-Normandie (PRIMACEN), Institute for Medical Research and Innovation (IRIB), University of Rouen, Mont-Saint-Aignan, France
- * E-mail: (MA), (HV)
| | - Marie-Christine Tonon
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation, University of Rouen, Mont-Saint-Aignan, France
| | - Mohamed Amri
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
- * E-mail: (MA), (HV)
| | - Olfa Masmoudi-Kouki
- Laboratory of Functional Neurophysiology and Pathology, Research Unit UR/11ES09, Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
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Abstract
This article briefly outlines the background and major findings of the research projects in which, together with a number of skilled and enthusiastic collaborators, I was involved at FGIN under the mentorship of the late Dr. Erminio Costa.The topics covered are (ì) our search for an endogenous ligand of the [3H]-imipramine binding site, as an approach to shed light on the still today elusive mechanisms underlying the therapeutic action of antidepressant drugs; (ìì) our attempt to correlate psychopathological states, characterized by dysfunctions of the GABAergic neurotransmission, with an altered brain content of Diazepam binding inhibitor (DBI), a peptide that exerts a direct negative modulation of GABAA receptor function and also, by binding to the mitochondrial benzodiazepine receptor, increases the brain content of GABAA receptor-active neurosteroids; (ììì) our demonstration that the activation of the glutamate/NMDA receptor, throughstimulation of several intracellular signaling pathways, induces the expression of the early inducible gene c-fos, a mechanism proposed to underlie glutamate-mediated neuronal plasticity.
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Affiliation(s)
- Maria Luisa Barbaccia
- Department of Neuroscience, University of Rome Tor Vergata, via Montpellier, 1-00133 Rome, Italy.
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Augoff K, Kolondra A, Chorzalska A, Lach A, Grabowski K, Sikorski AF. Expression, purification and functional characterization of recombinant human acyl-CoA-binding protein (ACBP) from erythroid cells. Acta Biochim Pol 2010; 57:533-540. [PMID: 21079819] [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] [Received: 04/19/2010] [Revised: 10/06/2010] [Accepted: 11/13/2010] [Indexed: 05/30/2023]
Abstract
Fatty acyl-CoA esters are extremely important in cellular homeostasis. They are intermediates in both lipid metabolism and post-translational protein modifications. Among these modification events, protein palmitoylation seems to be unique by its reversibility which allows dynamic regulation of the protein hydrophobicity. The recent discovery of an enzyme family that catalyze protein palmitoylation has increased the understanding of the enzymology of the covalent attachment of fatty acids to proteins. Despite that, the molecular mechanism of supplying acyl-CoA esters to this reaction is yet to be established. Acyl-coenzyme A-binding proteins are known to bind long-chain acyl-CoA esters with very high affinity. Therefore, they play a significant role in intracellular acyl-CoA transport and pool formation. The purpose of this work is to explore the potential of one of the acyl-CoA-binding proteins to participate in the protein palmitoylation. In this study, a recombinant form of ACBP derived from human erythroid cells was expressed in E. coli, purified, and functionally characterized. We demonstrate that recombinant hACBP effectively binds palmitoyl-CoA in vitro, undergoing a shift from a monomeric to a dimeric state, and that this ligand-binding ability is involved in erythrocytic membrane phosphatidylcholine (PC) remodeling but not in protein acylation.
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Affiliation(s)
- Katarzyna Augoff
- Department of Gastrointestinal and General Surgery, Wroclaw Medical University, Poland.
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Rego JLD, Leprince J, Luu-The V, Pelletier G, Tonon MC, Vaudry H. Structure−Activity Relationships of a Series of Analogs of the Endozepine Octadecaneuropeptide (ODN11-18) on Neurosteroid Biosynthesis by Hypothalamic Explants. J Med Chem 2007; 50:3070-6. [PMID: 17550241 DOI: 10.1021/jm0610548] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 11/29/2022]
Abstract
We have previously shown that the endozepine octadecaneuropeptide (ODN) stimulates the biosynthesis of neurosteroids from frog hypothalamic explants. In the present study, we have investigated the structure-activity relationships of a series of analogs of the C-terminal octapeptide of ODN (OP) on neurosteroid formation. We found that OP and its cyclic analog cyclo1-8OP stimulate in a concentration-dependent manner the synthesis of various steroids including 17-hydroxypregnenolone, progesterone, 17-hydroxyprogesterone and dehydroepiandrosterone. Deletion or Ala-substitution of the Arg1 or Pro2 residues of OP did not affect the activity of the peptide. In contrast, deletion or replacement of any of the amino acids of the C-terminal hexapeptide fragment totally abolished the effect of OP on neurosteroid biosynthesis. The present study indicates that the C-terminal hexapeptide of ODN/OP is the minimal sequence retaining full biological activity on steroid-producing neurons.
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Affiliation(s)
- Jean Luc Do Rego
- INSERM U413, Laboratory of Cellular and Molecular Neuroendocrinology, European Institute for Peptide Research (IFRMP 23), University of Rouen, 76821 Mont-Saint-Aignan, France
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Cortelli P, Avallone R, Baraldi M, Zeneroli ML, Mandrioli J, Corsi L, Riva R, Tinuper P, Lugaresi E, Baruzzi A, Montagna P. Endozepines in recurrent stupor. Sleep Med Rev 2005; 9:477-87. [PMID: 16233983 DOI: 10.1016/j.smrv.2005.07.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [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: 11/20/2022]
Abstract
Stupor is a condition from which the subject can be aroused only by vigorous stimuli. Most patients with stupor have a diffuse organic cerebral dysfunction. Rarely stupor is recurrent and no specific causes can be found. Patients with idiopathic recurrent stupor were awakened by i.v. administration of an antagonist (flumazenil) of the benzodiazepine recognition site located in the GABA(A) receptor. Since no exogenous benzodiazepines were detected in plasma and cerebrospinal fluid by high performance liquid chromatography, an excess of endogenous benzodiazepine-like compounds (endozepines) was proposed as the cause of stupor. The existence of endozepines, their widespread distribution in the CNS and their involvement in hepatic encephalopathy are established. However, the origin of these compounds, how biosynthesis occurs and the mechanisms and causes through which they alter brain functions are poorly understood. The fact that a number of synthetic benzodiazepines are difficult to detect using conventional techniques and the discovery that some cases of recurrent stupor were caused by fraudulent administration of lorazepam question whether the concept of endozepine recurrent stupor can be sustained. This review summarizes the state of endozepine physiology and pharmacology and the clinical syndromes attributed to their involvement. A diagnostic work-up to define endozepine-induced recurrent stupor is suggested.
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Affiliation(s)
- Pietro Cortelli
- Department of Neurological Sciences, University of Bologna, Via Ugo Foscolo, 7, 40123 Italy.
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Hu L, Deeney JT, Nolan CJ, Peyot ML, Ao A, Richard AM, Luc E, Faergeman NJ, Knudsen J, Guo W, Sorhede-Winzell M, Prentki M, Corkey BE. Regulation of lipolytic activity by long-chain acyl-coenzyme A in islets and adipocytes. Am J Physiol Endocrinol Metab 2005; 289:E1085-92. [PMID: 16091387 DOI: 10.1152/ajpendo.00210.2005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Intracellular lipolysis is a major pathway of lipid metabolism that has roles, not only in the provision of free fatty acids as energy substrate, but also in intracellular signal transduction. The latter is likely to be particularly important in the regulation of insulin secretion from islet beta-cells. The mechanisms by which lipolysis is regulated in different tissues is, therefore, of considerable interest. Here, the effects of long-chain acyl-CoA esters (LC-CoA) on lipase activity in islets and adipocytes were compared. Palmitoyl-CoA (Pal-CoA, 1-10 microM) stimulated lipase activity in islets from both normal and hormone-sensitive lipase (HSL)-null mice and in phosphatase-treated islets, indicating that the stimulatory effect was neither on HSL nor phosphorylation dependent. In contrast, we reproduced the previously published observations showing inhibition of HSL activity by LC-CoA in adipocytes. The inhibitory effect of LC-CoA on adipocyte HSL was dependent on phosphorylation and enhanced by acyl-CoA-binding protein (ACBP). In contrast, the stimulatory effect on islet lipase activity was blocked by ACBP, presumably due to binding and sequestration of LC-CoA. These data suggest the following intertissue relationship between islets and adipocytes with respect to fatty acid metabolism, LC-CoA signaling, and lipolysis. Elevated LC-CoA in islets stimulates lipolysis to generate a signal to increase insulin secretion, whereas elevated LC-CoA in adipocytes inhibits lipolysis. Together, these opposite actions of LC-CoA lower circulating fat by inhibiting its release from adipocytes and promoting fat storage via insulin action.
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Affiliation(s)
- Liping Hu
- Obesity Research Center, Boston University School of Medicine, 650 Albany Street, Boston, MA 02118, USA
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Dun XP, Li FF, Chen ZW. [Diazepam-binding inhibitor]. Sheng Li Ke Xue Jin Zhan 2005; 36:230-2. [PMID: 16270823] [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: 05/05/2023]
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Mediratta PK, Bhatia J, Tewary S, Katyal V, Mahajan P, Sharma KK. Attenuation of the effect of progesterone and 4'-chlordiazepam on stress-induced immune responses by bicuculline. Indian J Physiol Pharmacol 2003; 47:288-96. [PMID: 14723314] [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: 04/28/2023]
Abstract
The present study investigates the effect of progesterone, a pregnane precursor of neurosteroids, and 4'-chlordiazepam (4'-CD), a specific ligand for mitochondrial diazepam binding inhibitor receptor (MDR) involved in neurosteroidogenesis, on restraint stress (RS)-induced modulation of humoral and cell-mediated immune responses. RS produced a significant reduction in anti-sheep red blood cells (SRBC) antibody titre, a measure of humoral immune response, and % leucocyte migration inhibition (LMI) and foot-pad thickness test, measures of cell-mediated immune responses. These effects of RS on immune responses were effectively blocked by pretreating the animals with progesterone (10 mg/kg, sc) or 4'-CD (0.5 mg/kg, sc) administered just before subjecting the animal to RS. The effect of both progesterone and 4'-CD on RS-induced immune modulation was significantly attenuated by bicuculline (2 mg/kg, ip) but not by flumazenil (10 mg/kg, ip). Unlike its effect on RS-induced immune responsiveness, progesterone (5, 10 mg/kg, sc) when administered to non-stressed animals produced a significant suppression of both humoral and cell-mediated immune responses which was not reversed by bicuculline. However, 4'-CD failed to modulate immune response in naive non-stressed animals. These results suggest that progesterone and 4'-CD affect stress-induced immune responses by modulating GABA-ergic mechanism. However, GABA-A receptor system does not appear to be involved in progesterone-induced immunosuppression in nonstressed animals.
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Affiliation(s)
- P K Mediratta
- Department of Pharmacology, University College of Medical Sciences & GTB Hospital, Delhi 110 095
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Kannan L, Knudsen J, Jolly CA. Aging and acyl-CoA binding protein alter mitochondrial glycerol-3-phosphate acyltransferase activity. Biochim Biophys Acta 2003; 1631:12-6. [PMID: 12573444 DOI: 10.1016/s1388-1981(02)00367-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It is well known that cellular function declines with age. Since phosphatidic acid (PtdOH) biosynthesis is central to the generation of membrane phospholipids, the hypothesis that aging decreases PtdOH biosynthesis was tested. Glycerol-3-phosphate acyltransferase (GPAT) and lysophosphatidic acid acyltransferase (LAT) activities were examined in isolated mitochondria and microsomes from young and old rat liver. The results show that mitochondrial GPAT preference for palmitoyl-CoA over oleoyl-CoA was only observed if albumin or acyl-CoA binding protein (ACBP) were present in the assay in the young rats. Furthermore, mitochondrial GPAT activity was significantly reduced in the presence of albumin and ACBP in aged mitochondria using palmitoyl-CoA as the substrate. These data show, for the first time, that mitochondrial GPAT acyl-CoA preference is due to the presence of a protein that binds acyl-CoAs, not the enzyme itself, and that aging significantly reduces mitochondrial GPAT activity.
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Affiliation(s)
- Latha Kannan
- Division of Nutritional Sciences and The Institute of Cellular and Molecular Biology, The University of Texas at Austin, Gearing Room 117/A2700, Austin, TX 78712, USA
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Abstract
Recent studies indicate that ammonia and hypoosmotic astrocyte swelling can induce protein tyrosine nitration (PTN) in astrocytes with potential pathogenetic relevance for hepatic encephalopathy (HE). Because HE episodes are known to be precipitated also by sedatives, the effects of benzodiazepines on PTN in cultured rat astrocytes and rat brain in vivo were studied. In cultured rat astrocytes, diazepam, PK11195, Ro5-4864, and the benzodiazepine binding inhibitor (DBI), which acts on peripheral-type benzodiazepine receptors, induced PTN. Clonazepam, a specific ligand of the central benzodiazepine receptor, failed to induce PTN. Nanomolar concentrations of DBI and PK11195 were sufficient to increase PTN, and diazepam effects were already observed at concentrations of 1 micromol/L. Diazepam-induced PTN was insensitive to NOS inhibition and uric acid but was blunted by MK-801, BAPTA-AM, W13, and catalase, suggesting an involvement of NMDA-receptor activation, elevation of the cytosolic Ca(2+) concentration [Ca(2+)](i), and hydrogen peroxide. Diazepam induced a plateau-like increase in [Ca(2+)](i) and the generation of reactive oxygen intermediates (ROIs), which are both blunted by MK-801 and BAPTA-AM. The expression of functional N-methyl-D-aspartate (NMDA) receptors on cultured rat astrocytes was confirmed by reverse transcriptase polymerase chain reaction, Western blot analysis, immunhistochemistry, and receptor autoradiography. Astroglial PTN is also found in brains from rats challenged with diazepam, indicating the in vivo relevance of the present findings. In conclusion, production of ROIs and increased PTN by benzodiazepines may alter astrocyte function and thereby contribute to the precipitation of HE episodes.
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Affiliation(s)
- Boris Görg
- Clinic for Gastroenterology, Hepatology and Infectiology, Heinrich-Heine-University, Düsseldorf, Germany
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18
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Abstract
Microsomal acyl CoA:cholesterol acyltransferase (ACAT) is stimulated in vitro and/or in intact cells by proteins that bind and transfer both substrates, cholesterol, and fatty acyl CoA. To resolve the role of fatty acyl CoA binding independent of cholesterol binding/transfer, a protein that exclusively binds fatty acyl CoA (acyl CoA binding protein, ACBP) was compared. ACBP contains an endoplasmic reticulum retention motif and significantly colocalized with acyl-CoA cholesteryl acyltransferase 2 (ACAT2) and endoplasmic reticulum markers in L-cell fibroblasts and hepatoma cells, respectively. In the presence of exogenous cholesterol, ACAT was stimulated in the order: ACBP > sterol carrier protein-2 (SCP-2) > liver fatty acid binding protein (L-FABP). Stimulation was in the same order as the relative affinities of the proteins for fatty acyl CoA. In contrast, in the absence of exogenous cholesterol, these proteins inhibited microsomal ACAT, but in the same order: ACBP > SCP-2 > L-FABP. The extracellular protein BSA stimulated microsomal ACAT regardless of the presence or absence of exogenous cholesterol. Thus, ACBP was the most potent intracellular fatty acyl CoA binding protein in differentially modulating the activity of microsomal ACAT to form cholesteryl esters independent of cholesterol binding/transfer ability.
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Affiliation(s)
- Hsu Chao
- Department of Pathobiology, Texas A&M University, TVMC College Station, TX 77843-4467, USA
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19
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Abstract
The present study investigated the effect of diazepam binding inhibitor (DBI) on nociception in the central nervous system of rats. There were dose-dependent increases in hindpaw withdrawal latency (HWL) to noxious thermal and mechanical stimulation after intrathecal injection of 1, 5 or 10 microg of DBI in rats, indicating a DBI-induced anti-nociceptive effect at the spinal levels of rats. Furthermore, it was found that there were no significant influences of intrathecal co-administration of gamma-aminobutyric acid (GABA) on the intrathecal DBI-induced increases in HWLs of rats. Intracerebroventricular administration of 1, 10 or 20 microg of DBI also induced dose-dependent increases in HWL to thermal and mechanical stimulation in rats, suggesting an anti-nociceptive effect of DBI in the brain. Moreover, there were no significant influences of intracerebroventricular co-administration of 2 microg of GABA on the intracerebroventricular DBI-induced increases in HWL of rats. The results of the present study demonstrated that DBI played anti-nociceptive effects in the central nervous system of rats.
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Affiliation(s)
- Wei Wang
- Department of Physiology, College of Life Science, National Laboratory of Biomembrane and Membrane Biotechnology and Center for Brain and Cognitive Science, Peking University, Beijing 100871, PR China
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20
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Abstract
Diazepam binding inhibitor (DBI) is a putative endogenous ligand capable of binding to the central type benzodiazepine (BZD) receptor located on the GABAA receptor and the peripheral type BZD receptor on the mitochondrial outer membrane. We examined the effects of an intracerebroventricular injection of DBI on the serum levels of the gonadal hormones, testosterone and estradiol, respectively, in male and female mice. DBI (0.3-10 nmol/mouse, i.c.v.) significantly reduced the levels of both gonadal hormones in a dose-dependent manner. The decrease in the gonadal hormone levels became evident at 1 hr and lasted for at least 4 hrs after the DBI injection. The effects of DBI (3 nmol/mouse, i.c.v.) in male and female mice were completely attenuated by the coadministration of flumazenil (66 nmol/mouse), a selective antagonist for the central type BZD receptor. These results suggest that DBI acts as an endogenous modulator to regulate the levels of gonadal hormones in vivo, and that the DBI-induced decrease in gonadal hormone levels is mediated by down regulation of the GABAergic system, implicated in gonadotropin-releasing systems and/or the hypothalamic-pituitary-gonadal axis.
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Affiliation(s)
- Erbo Dong
- Department of Pharmacology, Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, Japan
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