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15 results on '"Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463)"'

1. Cholesterol 24-hydroxylase defect is implicated in memory impairments associated with Alzheimer-like Tau pathology

Author

Kristin Michaelsen-Preusse, Sophie Ayciriex, David Blum, Luc Buée, Marie-Claude Potier, Ivan Bièche, Francisco-Jose Fernandez-Gomez, Fathia Djelti, Luce Dauphinot, Jérôme Braudeau, Raphaëlle Caillierez, Nathalie Cartier, Marie-Anne Burlot, Olivier Laprévote, Benoit Gautier, Patrick Dutar, Martin Korte, Mickael Audrain, Brigitte Potier, Nicolas Auzeil, Jennifer Varin, Faculté de Pharmacie de Paris - Université Paris Descartes (UPD5 Pharmacie), Université Paris Descartes - Paris 5 (UPD5), Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Max-Planck-Gesellschaft, Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon, Thérapie génique, Génomique et Epigénomique (U 1169), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay, Zoological Institute, Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Centre de Psychiatrie et Neurosciences (U894), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Génétique, physiopathologie et approches thérapeutiques des maladies héréditaires du système nerveux (EA 7331), Inserm U986, Institut National de la Santé et de la Recherche Médicale (INSERM), Mécanismes adaptatifs : des organismes aux communautés, Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Alzheimer & Tauopathies [JPArc], Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille)-Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer - U837 (JPArc), Université Lille Nord de France (COMUE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Université Lille Nord de France (COMUE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille, Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer - U837 (JPArc), Université Lille Nord de France (COMUE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille, Institut de Chimie des Substances Naturelles (ICSN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Facultés des sciences pharmaceutiques et biologiques, Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute (ICM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Service MIRCEN (MIRCEN), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie François JACOB (JACOB), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris Descartes - Faculté de Pharmacie de Paris ( UPD5 Pharmacie ), Université Paris Descartes - Paris 5 ( UPD5 ), Max Planck Institute for Cell Biology and Genetics, Max-Planck-Institut, Institut des Sciences Analytiques ( ISA ), École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Université Claude Bernard Lyon 1 ( UCBL ), Thérapie génique, Génomique et Epigénomique ( U 1169 ), Université Paris-Saclay-Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Sud - Paris 11 ( UP11 ), Technische Universität Braunschweig [Braunschweig], Centre de Psychiatrie et Neurosciences ( CPN - U894 ), Université Paris Descartes - Paris 5 ( UPD5 ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Génétique, physiopathologie et approches thérapeutiques des maladies héréditaires du système nerveux ( EA 7331 ), Institut National de la Santé et de la Recherche Médicale, Mécanismes adaptatifs : des organismes aux communautés ( MECADEV ), Muséum National d'Histoire Naturelle ( MNHN ) -Centre National de la Recherche Scientifique ( CNRS ), Alzheimer & Tauopathies ( Equipe 1 ), Université de Lille-Centre Hospitalier Régional Universitaire [Lille] ( CHRU Lille ) -Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer (JPArc) - U1172 ( JPArc ), Université de Lille-Centre Hospitalier Régional Universitaire [Lille] ( CHRU Lille ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Centre de recherche Jean-Pierre Aubert-Neurosciences et Cancer, Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Université de Lille, Droit et Santé, Institut de Chimie des Substances Naturelles ( ICSN ), Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire ( EA 4463 ), Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute ( ICM ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -CHU Pitié-Salpêtrière [APHP]-Centre National de la Recherche Scientifique ( CNRS ), Department of Cellular and Systems Neurobiology, Max-Planck-Institut für Neurobiologie, Service MIRCEN ( MIRCEN ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Université Paris Descartes - Faculté de Pharmacie de Paris (UPD5 Pharmacie), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut de psychiatrie et neurosciences (U894 / UMS 1266), Alzheimer & Tauopathies (Equipe 1), Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille)-Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer - U1172 Inserm - U837 (JPArc), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Lille Nord de France (COMUE)-Université de Lille-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Lille Nord de France (COMUE)-Université de Lille, Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer - U1172 Inserm - U837 (JPArc), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Lille Nord de France (COMUE)-Université de Lille, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-CHU Pitié-Salpêtrière [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Institut de Biologie François JACOB (JACOB), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Institut de Biologie François JACOB (JACOB)

Subjects
[SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Hippocampus, Mice, chemistry.chemical_compound, 0302 clinical medicine, Cerebrospinal fluid, [ SDV.BBM.BC ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], Gliosis, Phosphorylation, [ SDV.BIBS ] Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], Genetics (clinical), ComputingMilieux_MISCELLANEOUS, 0303 health sciences, [SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Structural Biology [q-bio.BM], General Medicine, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], 3. Good health, medicine.anatomical_structure, Tauopathies, [ SDV.BBM.GTP ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], [ SDV.NEU.NB ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Alzheimer's disease, medicine.symptom, medicine.medical_specialty, Amyloid, Central nervous system, Mice, Transgenic, tau Proteins, Biology, 03 medical and health sciences, Alzheimer Disease, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Internal medicine, [SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], Cholesterol 24-Hydroxylase, Genetics, medicine, Animals, Humans, Cholesterol 24-hydroxylase, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], Molecular Biology, 030304 developmental biology, Memory Disorders, Cholesterol, medicine.disease, Hydroxycholesterols, Disease Models, Animal, Endocrinology, chemistry, Steroid Hydroxylases, [ CHIM.ANAL ] Chemical Sciences/Analytical chemistry, 030217 neurology & neurosurgery, [ SDV.BBM.BS ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM]
Abstract

Alzheimer's disease (AD) is characterized by both amyloid and Tau pathologies. The amyloid component and altered cholesterol metabolism are closely linked, but the relationship between Tau pathology and cholesterol is currently unclear. Brain cholesterol is synthesized in situ and cannot cross the blood-brain barrier: to be exported from the central nervous system into the blood circuit, excess cholesterol must be converted to 24S-hydroxycholesterol by the cholesterol 24-hydroxylase encoded by the CYP46A1 gene. In AD patients, the concentration of 24S-hydroxycholesterol in the plasma and the cerebrospinal fluid are lower than in healthy controls. The THY-Tau22 mouse is a model of AD-like Tau pathology without amyloid pathology. We used this model to investigate the potential association between Tau pathology and CYP46A1 modulation. The amounts of CYP46A1 and 24S-hydroxycholesterol in the hippocampus were lower in THY-Tau22 than control mice. We used an adeno-associated virus (AAV) gene transfer strategy to increase CYP46A1 expression in order to investigate the consequences on THY-Tau22 mouse phenotype. Injection of the AAV-CYP46A1 vector into the hippocampus of THY-Tau22 mice led to CYP46A1 and 24S-hydroxycholesterol content normalization. The cognitive deficits, impaired long-term depression and spine defects that characterize the THY-Tau22 model were completely rescued, whereas Tau hyperphosphorylation and associated gliosis were unaffected. These results argue for a causal link between CYP46A1 protein content and memory impairments that result from Tau pathology. Therefore, CYP46A1 may be a relevant therapeutic target for Tauopathies and especially for AD.

Published
2015

2. CYP46A1 inhibition, brain cholesterol accumulation and neurodegeneration pave the way for Alzheimer’s disease

Author

Dominique Langui, Michel Vidaud, Eloise Hudry, Nathalie Cartier, Ivan Bièche, Marc Dhenain, Sandro Alves, Olivier Laprévote, Patrick Aubourg, Sophie Ayciriex, Charles Duyckaerts, Jérôme Braudeau, Catherine Marquer, Nicolas Auzeil, Farah Chali, Marie-Claude Potier, Richard B. Miles, Fathia Djelti, Jennifer Varin, Faculté de Pharmacie de Paris - Université Paris Descartes (UPD5 Pharmacie), Université Paris Descartes - Paris 5 (UPD5), Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Max-Planck-Gesellschaft, Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon, Mécanismes adaptatifs : des organismes aux communautés, Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Thérapie génique, Génomique et Epigénomique (U 1169), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay, Laboratoire des Maladies Neurodégénératives - UMR 9199 (LMN), Service MIRCEN (MIRCEN), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie François JACOB (JACOB), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie François JACOB (JACOB), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Génétique, physiopathologie et approches thérapeutiques des maladies héréditaires du système nerveux (EA 7331), Facultés des sciences pharmaceutiques et biologiques, Centre de Recherche de l'Institut du Cerveau et de la Moelle épinière (CRICM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Toxicité environnementale, cibles thérapeutiques, signalisation cellulaire (T3S - UMR_S 1124), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute (ICM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC), Institut de Chimie des Substances Naturelles (ICSN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Genetique et Biotherapies des Maladies Degeneratives et Proliferatives du Systeme Nerveux (Inserm U745), Institut des sciences du Médicament -Toxicologie - Chimie - Environnement (IFR71), Institut de Recherche pour le Développement (IRD)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire de Neuropathologie Raymond Escourolle [CHU Pitié-Salpétriêre], Université Pierre et Marie Curie - Paris 6 (UPMC)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Inserm U986, Institut National de la Santé et de la Recherche Médicale (INSERM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris Descartes - Faculté de Pharmacie de Paris (UPD5 Pharmacie), Université Paris-Saclay-Institut de Biologie François JACOB (JACOB), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Biologie François JACOB (JACOB), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Centre National de la Recherche Scientifique (CNRS), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Université Paris Descartes - Faculté de Pharmacie de Paris ( UPD5 Pharmacie ), Université Paris Descartes - Paris 5 ( UPD5 ), Max Planck Institute for Cell Biology and Genetics, Max-Planck-Institut, Institut des Sciences Analytiques ( ISA ), École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Université Claude Bernard Lyon 1 ( UCBL ), Mécanismes adaptatifs : des organismes aux communautés ( MECADEV ), Muséum National d'Histoire Naturelle ( MNHN ) -Centre National de la Recherche Scientifique ( CNRS ), Thérapie génique, Génomique et Epigénomique ( U 1169 ), Université Paris-Saclay-Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Sud - Paris 11 ( UP11 ), Laboratoire des Maladies Neurodégénératives - UMR 9199 ( LMN ), Université Paris-Sud - Paris 11 ( UP11 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Génétique, physiopathologie et approches thérapeutiques des maladies héréditaires du système nerveux ( EA 7331 ), Centre de Recherche de l'Institut du Cerveau et de la Moelle épinière ( CRICM ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Centre National de la Recherche Scientifique ( CNRS ), Toxicologie, Pharmacologie et Signalisation Cellulaire ( U1124 ), Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Université Paris Descartes - Paris 5 ( UPD5 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire ( EA 4463 ), Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute ( ICM ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -CHU Pitié-Salpêtrière [APHP]-Centre National de la Recherche Scientifique ( CNRS ), Université Pierre et Marie Curie - Paris 6 ( UPMC ), Institut de Chimie des Substances Naturelles ( ICSN ), Centre National de la Recherche Scientifique ( CNRS ), Genetique et Biotherapies des Maladies Degeneratives et Proliferatives du Systeme Nerveux ( Inserm U745 ), Institut des sciences du Médicament -Toxicologie - Chimie - Environnement ( IFR71 ), Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Ecole Nationale Supérieure de Chimie de Paris- Chimie ParisTech-PSL ( ENSCP ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut de Recherche pour le Développement ( IRD ) -Université Paris Descartes - Paris 5 ( UPD5 ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Ecole Nationale Supérieure de Chimie de Paris- Chimie ParisTech-PSL ( ENSCP ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut de Recherche pour le Développement ( IRD ) -Université Paris Descartes - Paris 5 ( UPD5 ) -Université Paris Descartes - Paris 5 ( UPD5 ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Laboratoire de Neuropathologie Raymond Escourolle, Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Assistance publique - Hôpitaux de Paris (AP-HP)-CHU Pitié-Salpêtrière [APHP], Institut National de la Santé et de la Recherche Médicale, Service MIRCEN ( MIRCEN ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut de Biologie François JACOB (JACOB), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-CHU Pitié-Salpêtrière [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Institut National de la Santé et de la Recherche Médicale (INSERM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Paris Descartes - Paris 5 (UPD5)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Pitié-Salpêtrière [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Hippocampus, Hippocampal formation, Small hairpin RNA, chemistry.chemical_compound, Amyloid beta-Protein Precursor, 0302 clinical medicine, [ SDV.BBM.BC ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], RNA interference, Homeostasis, Enzyme Inhibitors, [ SDV.BIBS ] Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], Lipid raft, ComputingMilieux_MISCELLANEOUS, Neurons, 0303 health sciences, [SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Structural Biology [q-bio.BM], Neurodegeneration, Brain, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], 3. Good health, Cholesterol, [ SDV.BBM.GTP ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], [ SDV.NEU.NB ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Female, medicine.medical_specialty, Mice, Transgenic, Biology, 03 medical and health sciences, Alzheimer Disease, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Internal medicine, [SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], medicine, Cholesterol 24-Hydroxylase, Animals, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], Liver X receptor, 030304 developmental biology, Amyloid beta-Peptides, medicine.disease, Mice, Inbred C57BL, Endocrinology, chemistry, Steroid Hydroxylases, [ CHIM.ANAL ] Chemical Sciences/Analytical chemistry, Neurology (clinical), Neuroscience, 030217 neurology & neurosurgery, [ SDV.BBM.BS ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM]
Abstract

Abnormalities in neuronal cholesterol homeostasis have been suspected or observed in several neurodegenerative disorders including Alzheimer's disease, Parkinson's disease and Huntington's disease. However, it has not been demonstrated whether an increased abundance of cholesterol in neurons in vivo contributes to neurodegeneration. To address this issue, we used RNA interference methodology to inhibit the expression of cholesterol 24-hydroxylase, encoded by the Cyp46a1 gene, in the hippocampus of normal mice. Cholesterol 24-hydroxylase controls cholesterol efflux from the brain and thereby plays a major role in regulating brain cholesterol homeostasis. We used an adeno-associated virus vector encoding short hairpin RNA directed against the mouse Cyp46a1 mRNA to decrease the expression of the Cyp46a1 gene in hippocampal neurons of normal mice. This increased the cholesterol concentration in neurons, followed by cognitive deficits and hippocampal atrophy due to apoptotic neuronal death. Prior to neuronal death, the recruitment of the amyloid protein precursor to lipid rafts was enhanced leading to the production of β-C-terminal fragment and amyloid-β peptides. Abnormal phosphorylation of tau and endoplasmic reticulum stress were also observed. In the APP23 mouse model of Alzheimer's disease, the abundance of amyloid-β peptides increased following inhibition of Cyp46a1 expression, and neuronal death was more widespread than in normal mice. Altogether, these results suggest that increased amounts of neuronal cholesterol within the brain may contribute to inducing and/or aggravating Alzheimer's disease.

Published
2015

3. Ultra performance liquid chromatography - mass spectrometry studies of formalin-induced alterations of human brain lipidome

Author

Ayciriex , Sophie, Gaudin , Mathieu, Panchal , Mai, Werner , Erwan, Brunelle , Alain, Touboul , David, Boursier-Neyret , Claire, Auzeil , Nicolas, Walther , Bernard, Duyckaerts , Charles, Laprévote , Olivier, Faculté de Pharmacie de Paris - Université Paris Descartes (UPD5 Pharmacie), Université Paris Descartes - Paris 5 (UPD5), Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Max-Planck-Gesellschaft, Géosciences Marines (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut de Chimie des Substances Naturelles (ICSN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Métabolisme des Médicaments (LEMM), Service de Pharmacologie et Immunoanalyse (SPI), Médicaments et Technologies pour la Santé (MTS), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Médicaments et Technologies pour la Santé (MTS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Laboratoire de Neuropathologie Raymond Escourolle [CHU Pitié-Salpétriêre], Université Pierre et Marie Curie - Paris 6 (UPMC)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Centre National de la Recherche Scientifique (CNRS), Université Paris Descartes - Faculté de Pharmacie de Paris (UPD5 Pharmacie), Unité de recherche Géosciences Marines (Ifremer) (GM), Laboratoire de Neuropathologie Raymond Escourolle, Université Pierre et Marie Curie - Paris 6 (UPMC)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Pitié-Salpêtrière [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Université Paris Descartes - Faculté de Pharmacie de Paris ( UPD5 Pharmacie ), Université Paris Descartes - Paris 5 ( UPD5 ), Max Planck Institute for Cell Biology and Genetics, Max-Planck-Institut, Institut des Sciences Analytiques ( ISA ), École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon, Unité de recherche Géosciences Marines (Ifremer) ( GM ), Institut Français de Recherche pour l'Exploitation de la Mer ( IFREMER ), ICNS - Institut de Chimie des Substances naturelles, Laboratoire d'Etude du Métabolisme des Médicaments ( LEMM ), Service de Pharmacologie et Immunoanalyse ( SPI ), Département Médicaments et Technologies pour la Santé ( DMTS ), Direction de Recherche Fondamentale (CEA) ( DRF (CEA) ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) ( DRF (CEA) ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Département Médicaments et Technologies pour la Santé ( DMTS ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Chimie des Substances Naturelles ( ICSN ), Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire ( EA 4463 ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Assistance publique - Hôpitaux de Paris (AP-HP)-CHU Pitié-Salpêtrière [APHP], Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Médicaments et Technologies pour la Santé (MTS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and CHU Pitié-Salpêtrière [APHP]-Assistance publique - Hôpitaux de Paris (AP-HP) (APHP)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
[SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Structural Biology [q-bio.BM], [CHIM.ORGA]Chemical Sciences/Organic chemistry, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], [SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], [ SDV.BBM.BC ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], [ SDV.BBM.GTP ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [ SDV.NEU.NB ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, [SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], [ CHIM.ANAL ] Chemical Sciences/Analytical chemistry, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], [ SDV.BIBS ] Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], ComputingMilieux_MISCELLANEOUS, [ SDV.BBM.BS ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM]
Abstract

International audience

Published
2014

4. Weak protein–cationic co-ion interactions addressed by X-ray crystallography and mass spectrometry

Author

Philippe Benas, Laurent Legrand, Anne Regazzetti, Franck Brachet, Nicolas Auzeil, Madeleine Riès-Kautt, Laboratoire de cristallographie et RMN biologiques (LCRB - UMR 8015), Université Paris Descartes - Paris 5 (UPD5)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut de biologie et chimie des protéines [Lyon] (IBCP), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de cristallographie et RMN biologiques ( LCRB - UMR 8015 ), Université Paris Descartes - Paris 5 ( UPD5 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire ( EA 4463 ), Université Paris Descartes - Paris 5 ( UPD5 ), Institut des Nanosciences de Paris ( INSP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de biologie et chimie des protéines [Lyon] ( IBCP ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5)

Subjects
Spectrometry, Mass, Electrospray Ionization, Hofmeister series, Electrospray ionization, Analytical chemistry, Salt (chemistry), 010402 general chemistry, Mass spectrometry, Crystallography, X-Ray, 01 natural sciences, 03 medical and health sciences, Structural Biology, Cations, Binding site, 030304 developmental biology, chemistry.chemical_classification, [PHYS]Physics [physics], 0303 health sciences, [ PHYS ] Physics [physics], Proteins, General Medicine, 0104 chemical sciences, Crystallography, chemistry, X-ray crystallography, Titration, Adsorption, Protein crystallization
Abstract

The adsorption of Rb+, Cs+, Mn2+, Co2+and Yb3+onto the positively charged hen egg-white lysozyme (HEWL) has been investigated by solving 13 X-ray structures of HEWL crystallized with their chlorides and by applying electrospray ionization mass spectrometry (ESI-MS) first to dissolved protein crystals and then to the protein in buffered salt solutions. The number of bound cations follows the order Cs+< Mn2+≃ Co2+< Yb3+at 293 K. HEWL binds less Rb+(qtot= 0.7) than Cs+(qtot= 3.9) at 100 K. Crystal flash-cooling drastically increases the binding of Cs+, but poorly affects that of Yb3+, suggesting different interactions. The addition of glycerol increases the number of bound Yb3+cations, but only slightly increases that of Rb+. HEWL titrations with the same chlorides, followed by ESI-MS analysis, show that only about 10% of HEWL binds Cs+and about 40% binds 1–2 Yb3+cations, while the highest binding reaches 60–70% for protein binding 1–3 Mn2+or Co2+cations. The binding sites identified by X-ray crystallography show that the monovalent Rb+and Cs+preferentially bind to carbonyl groups, whereas the multivalent Mn2+, Co2+and Yb3+interact with carboxylic groups. This work elucidates the basis of the effect of the Hofmeister cation series on protein solubility.

Published
2014

5. The lipidome associated with the -secretase complex is required for its integrity and activity

Author

Ayciriex , Sophie, Djelti , Fathia, Alves , Sandro, Regazzetti , Anne, Gaudin , Mathieu, Varin , Jennifer, Langui , Dominique, Bieche , Ivan, Hudry , Eloise, Dargère , Delphine, Aubourg , Patrick, Auzeil , Nicolas, Laprévote , Olivier, Cartier , Nathalie, Rougemont , Blandine, Bontemps Gallo , Sébastien, Carrière , Romain, Hondermarck , Hubert, Lacroix , Jean Marie, Le Blanc , J., Lemoine , Jérôme, Gerber , H., Osuna , M., Chami , M., Stahlberg , H., Shevchenko , A., Fraering , P., Université Paris Descartes - Faculté de Pharmacie de Paris ( UPD5 Pharmacie ), Université Paris Descartes - Paris 5 ( UPD5 ), Max Planck Institute for Cell Biology and Genetics, Max-Planck-Institut, Institut des Sciences Analytiques ( ISA ), École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon, Mécanismes adaptatifs : des organismes aux communautés ( MECADEV ), Muséum National d'Histoire Naturelle ( MNHN ) -Centre National de la Recherche Scientifique ( CNRS ), Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute ( ICM ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -CHU Pitié-Salpêtrière [APHP]-Centre National de la Recherche Scientifique ( CNRS ), Physique et mécanique des milieux hétérogenes ( PMMH ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Université Paris Diderot - Paris 7 ( UPD7 ) -ESPCI ParisTech-Centre National de la Recherche Scientifique ( CNRS ), Unité de recherche Géosciences Marines (Ifremer) ( GM ), Institut Français de Recherche pour l'Exploitation de la Mer ( IFREMER ), Génétique, physiopathologie et approches thérapeutiques des maladies héréditaires du système nerveux ( EA 7331 ), Université Pierre et Marie Curie - Paris 6 ( UPMC ), Facultés des sciences pharmaceutiques et biologiques, Inserm U986, Institut National de la Santé et de la Recherche Médicale, Laboratoire de Chimie et Toxicologie Analytique et Cellulaire ( EA 4463 ), Institut de Chimie des Substances Naturelles ( ICSN ), Centre National de la Recherche Scientifique ( CNRS ), Service MIRCEN ( MIRCEN ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, ANABIO-MS - Analyse biomoléculaire par spectrométrie de masse - Biological Analysis by Mass Spectrometry, Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Signalisation des facteurs de croissance dans le cancer du sein. Protéomique fonctionnelle, Institut National de la Santé et de la Recherche Médicale ( INSERM ), Laboratoire d'océanographie de Villefranche ( LOV ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), and Max Planck Institute of Molecular Cell Biology and Genetics ( MPI-CBG )

Subjects
[ SDV.BBM.BC ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], [ SDV.BBM.GTP ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], [ SDV.NEU.NB ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, [ CHIM.ANAL ] Chemical Sciences/Analytical chemistry, [ SDV.BIBS ] Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], ComputingMilieux_MISCELLANEOUS, [ SDV.BBM.BS ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM]
Abstract

International audience

Published
2016

6. Unusual Post-Spray Proton Transfer to Protein Using Acetone Spray in Desorption Electrospray Ionization

Author

Jean-Claude Tabet, Nicolas Auzeil, Anna Warnet, Institut Parisien de Chimie Moléculaire (IPCM), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Chimie Structurale Organique et Biologique (CSOB), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Electrospray ionization, Lysozyme, Analytical chemistry, MS, Ion, Solvent, chemistry.chemical_compound, DESI, Adsorption, chemistry, Aprotic solvent, Ionization, Labelling, Acetone, Mass spectrum, Cationization, [CHIM]Chemical Sciences
Abstract

International audience; Although acetone, in DESI ionisation generally leads to protein aggregation, in this study we report unexpected multi-proton transfers to lysozyme using this aprotic solvent as a charged spray. The DESI/acetone mass spectrum of lysozyme displays (i) a significant increase in the average charge state (Zav) and (ii) an incomplete H+/Ca2+ exchange, even though the overall contribution of cationised species is high, relative to those from spraying with a methanol/water solvent. This behavior is contrary to that expected from gas phase basicity, because GBacetone >GBmethanol. Decreasing the amount of sample deposited on the target (from 50 to 0.050 pmole) leads to a charge state increase, as seen in ESI, but not in the extent of cationisation. Moreover, the DESI signal duration is extended with sprayed acetone even though the total ionic current is significantly lowered. With a d6-acetone spray, no incorporation of a deuteron occurs, and the ionization yield is strongly decreased for multi-protonated lysoi+ lysozyme. This is in contrast to that observed with a d4-methanol spray, which displays a distribution of 48 deuterons in the lyso9+ ion as shown in high resolution with a LTQ/Orbitrap instrument. This unexpected behavior of the (CD3)2CO spray suggests that protons do not originate from acetone. Furthermore, dry argon post-flow on the target surface results in the lysozyme signal suppression, whereas with a humid argon flow, the signal is regenerated. On the other hand, an argon stream bubbling in heavy water, yields incorporation of several deuterons. The interpretation of this behavior is explained by considering the acetone radical ions at the surface of the primary droplets (and/or offspring droplets and/or at the wet sample surface), being able to react with ambient moisture (or with traces of water adsorbed at liquid phase). Under these conditions, enough protons are produced to generate multi-charged solvated lysozyme aggregates which then become desolvated in the reduced pressure in the skimmer area.

Published
2015

7. Specific uptake and genotoxicity induced by polystyrene nanobeads with distinct surface chemistry on human lung epithelial cells and macrophages

Author

Anne Braun, Kelly Blazy, Patrice Rat, Thierry Kortulewski, Christelle Gamez, Vincent Paget, Samir Dekali, Olivier Aguerre-Chariol, Ghislaine Lacroix, Romain Grall, Sylvie Chevillard, Institut National de l'Environnement Industriel et des Risques (INERIS), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Institut de Radiobiologie Cellulaire et Moléculaire (IRCM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Cell Survival, Surface Properties, lcsh:Medicine, 02 engineering and technology, 010501 environmental sciences, medicine.disease_cause, 01 natural sciences, Flow cytometry, Cell Line, Histones, Oxazines, medicine, Fluorescence microscope, Cytotoxic T cell, Humans, DNA Breaks, Double-Stranded, Viability assay, Particle Size, lcsh:Science, Cytotoxicity, 0105 earth and related environmental sciences, Amination, Multidisciplinary, medicine.diagnostic_test, Chemistry, Macrophages, lcsh:R, Epithelial Cells, 021001 nanoscience & nanotechnology, Molecular biology, Glutathione, 3. Good health, Xanthenes, Cell culture, [SDV.TOX]Life Sciences [q-bio]/Toxicology, [SDE]Environmental Sciences, Biophysics, Nanoparticles, Polystyrenes, lcsh:Q, 0210 nano-technology, Reactive Oxygen Species, Intracellular, Genotoxicity, Research Article, DNA Damage
Abstract

Nanoparticle surface chemistry is known to play a crucial role in interactions with cells and their related cytotoxic effects. As inhalation is a major route of exposure to nanoparticles, we studied specific uptake and damages of well-characterized fluorescent 50 nm polystyrene (PS) nanobeads harboring different functionalized surfaces (non-functionalized, carboxylated and aminated) on pulmonary epithelial cells and macrophages (Calu-3 and THP-1 cell lines respectively). Cytotoxicity of in mass dye-labeled functionalized PS nanobeads was assessed by xCELLigence system and alamarBlue viability assay. Nanobeads-cells interactions were studied by video-microscopy, flow cytometry and also confocal microscopy. Finally ROS generation was assessed by glutathione depletion dosages and genotoxicity was assessed by γ-H2Ax foci detection, which is considered as the most sensitive technique for studying DNA double strand breaks. The uptake kinetic was different for each cell line. All nanobeads were partly adsorbed and internalized, then released by Calu-3 cells, while THP-1 macrophages quickly incorporated all nanobeads which were located in the cytoplasm rather than in the nuclei. In parallel, the genotoxicity study reported that only aminated nanobeads significantly increased DNA damages in association with a strong depletion of reduced glutathione in both cell lines. We showed that for similar nanoparticle concentrations and sizes, aminated polystyrene nanobeads were more cytotoxic and genotoxic than unmodified and carboxylated ones on both cell lines. Interestingly, aminated polystyrene nanobeads induced similar cytotoxic and genotoxic effects on Calu-3 epithelial cells and THP-1 macrophages, for all levels of intracellular nanoparticles tested. Our results strongly support the primordial role of nanoparticles surface chemistry on cellular uptake and related biological effects. Moreover our data clearly show that nanoparticle internalization and observed adverse effects are not necessarily associated.

Published
2015

8. Rôle des complexes de gadolinium dans le mécanisme de la fibrose systémique néphrogénique

Author

Fretellier, Nathalie, Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Université René Descartes - Paris V, France Massicot, and Jean-Marc Idée

Subjects
Renal failure, [SDV.MHEP] Life Sciences [q-bio]/Human health and pathology, Fibrose Systémique Néphrogénique, Fibrose, Gadolinium, Fibrosis, [CHIM.OTHE] Chemical Sciences/Other, Nephrogenic systemic fibrosis, Insuffisance rénale, Relaxométrie, Relaxometry, [CHIM.OTHE]Chemical Sciences/Other, Dissociation, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, Gadolinium complexes, Complexes de gadolinium
Abstract

Nephrogenic systemic fibrosis (NSF) is a rare systemic fibrosing disorder which has been described in patients with severe or end stage renal failure. NSF is associated with prior administration of certain gadolinium complexes (GCs), used as magnetic resonance imaging contrast agents, particularly those which have the lowest thermodynamic stability. The most widely accepted hypothesis regarding the mechanism is based on profibrotic effects of free Gd3+ following in vivo dissociation of the less stable GCs. Nevertheless, there is no conclusive evidence so far. The pathophysiology is not completely understood, especially due to the lack of relevant non-clinical models. The purpose of our thesis was to investigate the relationship between physicochemical properties of GCs (molecular structure, thermodynamic stability) and the risk of chronic toxicity (especially fibrosis), in order to enhance our understanding of their role in the mechanism of NSF. We have set-up various non-clinical models of NSF in renally-impaired rats. We also compared the effects of all categories of GCs on these models. A high systemic toxicity, associated with macroscopic skin lesions and dermal fibrosis, was observed after the administration of gadodiamide (a linear and nonionic GC with a low thermodynamic stability). Whereas more stable, macrocyclic GCs were well tolerated. These findings seem clinically-relevant because the vast majority of NSF cases are associated with gadodiamide. We also showed that systemic and skin toxicities depend on the baseline renal function, and that hyperphosphataemia sensitizes renally-impaired rats to the fibrotic effects of gadodiamide. Our data suggest that these factors are, actually, risk factors for NSF. We observed in vivo dissociation of two linear GCs, gadodiamide and gadopentetic acid, with gradual release of soluble Gd3+, in renally-impaired rats. Macrocyclic agents remained stable. This observation was also confirmed both in rat and human serum by the relaxometry technique. Our results are also consistent with an interaction between dissociated Gd3+ and serum proteins. We also demonstrated that elevated serum phosphate levels accelerates the release of Gd3+. Taken all together, our results suggest a causal role of dissociated Gd3+ in gadodiamide-induced skin lesions in renally-impaired rats. Finally, we identified the involvement of the canonical signaling pathway of TGFβ, the central mediator of the fibrotic response, in gadodiamide-treated rats with a moderate renal failure. Our work is consistent with a causal role of dissociated Gd in the mechanism of NSF.; La fibrose systémique néphrogénique (FSN) est une maladie rare et relativement récente, observée uniquement chez des patients souffrant d’insuffisance rénale sévère ou terminale. Elle est liée à l’administration d’une certaine catégorie de complexes de gadolinium (CG), les CGs thermodynamiquement moins stables, utilisés comme produits de contraste pour l’imagerie par résonance magnétique. L’hypothèse mécanistique la plus couramment citée concerne les effets profibrosants du Gd3+ « libre » après dissociation in vivo des CGs les moins stables mais il n’en existe pas de démonstration formelle. La physiopathologie de cette maladie reste mal connue, notamment par manque de modèles précliniques pertinents. Les travaux de cette thèse répondent donc à la nécessité d’approfondir nos connaissances concernant les relations entre les propriétés physicochimiques des CGs (structure, stabilité) et le risque de toxicité chronique, afin de mieux comprendre leur rôle dans le mécanisme de la FSN. Nous avons mis aux points plusieurs modèles de FSN chez le Rat. Nous avons aussi comparé les effets de toutes les catégories structurales des CGs sur ces modèles. Une toxicité systémique importante et la survenue de lésions cutanées macroscopiques et d’une fibrose du derme sont notées après administration de gadodiamide (un CG linéaire et ionique de faible stabilité), ce qui est cohérent avec le fait que la grande majorité des cas de FSN sont associés à cet agent. Nous avons aussi montré que cette toxicité dépend du degré d’insuffisance rénale et que l’hyperphosphatémie sensibilise les animaux aux effets profibrosants du gadodiamide. Nos données suggèrent donc que ces facteurs associés sont des facteurs de risque de la FSN. Nous avons observé la dissociation progressive in vivo de deux CGs linéaires présentant une faible stabilité, le gadodiamide et l’acide gadopentétique, après administration chez le Rat insuffisant rénal, avec libération de Gd3+ sous forme libre et soluble. Les CGs macrocycliques sont restés stables. Nous avons confirmé cette stabilité sur du sérum de Rat et du sérum humain alors que le gadodiamide se dissocie in vitro. Nos données suggèrent aussi une interaction entre l’ion Gd3+ dissocié à partir du gadodiamide et les protéines sériques. Cette libération de Gd3+ est accélérée en présence d’une forte concentration de phosphate. Globalement, nos résultats suggèrent ainsi un rôle causal du Gd3+ libre dans les lésions cutanées observées chez les animaux insuffisants rénaux. Enfin, nous avons observé l’implication de la voie de signalisation canonique de TGFβ, le marqueur clé de la fibrose, uniquement chez des rats ayant reçu le gadodiamide et dont l’insuffisance rénale est modérée. Nos travaux sont donc en faveur de l’hypothèse mécanistique d’une dissociation des CGs peu stables.

Published
2013

9. Fisetin disposition and metabolism in mice: Identification of geraldol as an active metabolite

Author

Touil, Yasmine, Auzeil, Nicolas, Boulinguez, François, Saighi, Hanane, Regazzetti, Anne, Scherman, Daniel, Chabot, Guy, Unité de pharmacologie chimique et génétique et d'imagerie (UPCGI - UMR 8151 / UMR_S 1022 ), Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Inserm, CNRS, and Institut National du Cancer (INCa)

Subjects
MESH: Cell Line, Tumor, fisetin, [SDV.CAN]Life Sciences [q-bio]/Cancer, MESH: Glucuronides, MESH: Mice, Inbred C57BL, MESH: Collagen, MESH: Animals, MESH: Endothelial Cells, geraldol, MESH: Mice, MESH: Cell Movement, MESH: Angiogenesis Inhibitors, MESH: Drug Combinations, MESH: Carcinoma, Lewis Lung, MESH: Flavones, MESH: Laminin, MESH: Cell Survival, MESH: Proteoglycans, Flavonoid, cytotoxicity, MESH: Antineoplastic Agents, pharmacokinetics, metabolism, MESH: Female, MESH: Flavonoids, MESH: Neoplasm Transplantation
Abstract

International audience; Although the natural flavonoid fisetin (3,3',4',7-tetrahydroxyflavone) has been recently identified as an anticancer agent with antiangiogenic properties in mice, its in vivo pharmacokinetics and metabolism are presently not characterized. Our purpose was to determine the pharmacokinetics and metabolism of fisetin in mice and determine the biological activity of a detected fisetin metabolite. After fisetin administration of an efficacious dose of 223 mg/kg i.p. in mice, the maximum fisetin concentration reached 2.5 μg/ml at 15 min and the plasma concentration declined biphasically with a rapid half-life of 0.09 h and a terminal half-life of 3.1h. Three metabolites were detected, one of which was a glucuronide of fisetin (M1), whereas another glucuronide (M2) was a glucuronide of a previously unknown fisetin metabolite (M3). HPLC-MS/MS analysis indicated that M3 was a methoxylated metabolite of fisetin (MW=300 Da). The UV spectrum of M3 was identical to that of fisetin and standard 3,4',7-trihydroxy-3'-methoxyflavone (geraldol). In addition, because M3 co-eluted with standard geraldol in 4 different chromatographic ternary gradient conditions, M3 was therefore assigned to geraldol. Of interest, this metabolite was shown to achieve higher concentrations than fisetin in Lewis lung tumors. We also compared the cytotoxic and antiangiogenic activities of fisetin and geraldol in vitro and it was found that the latter was more cytotoxic than the parent compound toward tumor cells, and that it could also inhibit endothelial cells migration and proliferation. In conclusion, these results suggest that fisetin metabolism plays an important role in its in vivo anticancer activities.

Published
2011

10. Identification and induction of cytochrome P450s involved in the metabolism of flavone-8-acetic acid in mice

Author

Nicolas Auzeil, Hervé Rhinn, Anne Regazzetti, Guy G. Chabot, Djamel Eddine Harami, Daniel Scherman, Minh Hien Pham, Unité de pharmacologie chimique et génétique et d'imagerie (UPCGI - UMR 8151 / UMR_S 1022 ), Ecole Nationale Supérieure de Chimie de Paris- Chimie ParisTech-PSL (ENSCP) - Université Paris Descartes - Paris 5 (UPD5) - Institut National de la Santé et de la Recherche Médicale (INSERM) - Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Inserm, CNRS, and Institut National du Cancer (INCa)

Subjects
Furafylline, flavone-8-acetic acid, cytochrome P450, Clinical Biochemistry, Pharmaceutical Science, Biology, Hydroxylation, Article, Mice, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Cytochrome P-450 Enzyme System, [SDV.CAN] Life Sciences [q-bio]/Cancer, In vivo, Animals, Pharmacology (medical), microsomes, Epoxide hydrolase, induction, 030304 developmental biology, Epoxide Hydrolases, Flavonoids, 0303 health sciences, Biochemistry (medical), CYP1A2, CYP2E1, Acetylcysteine, 3. Good health, Mice, Inbred C57BL, Biochemistry, chemistry, Enzyme Induction, 030220 oncology & carcinogenesis, Microsomes, Liver, Microsome, Female, metabolism, Drug metabolism
Abstract

International audience; The metabolism of flavone-8-acetic acid (FAA) has been hypothesized to be partly responsible for its potent anticancer activity in mice. The purpose of this study was to identify the mouse enzymes involved in FAA Phase I metabolism and evaluate their possible induction in vivo by FAA. Mouse microsomes metabolized FAA into 6 metabolites: 3',4'-dihydrodiol-FAA, 5,6-epoxy-FAA, 4'-OH-FAA, 3'-OH-FAA, 3',4'-epoxy-FAA and 6-OH-FAA. Using Cyp-specific inhibitors (furafylline, Cyp1a2; α-naphthoflavone, Cyp1b1; tranylcypromine, Cyp2b9; quercetin, Cyp2c29; quinidine, 2d9; diethyldithiocarbamate, Cyp2e1; ketoconazole, Cyp3a11), the formation of 5,6-epoxy-FAA was mainly attributed to Cyps 1a2, 1b1, 2b9, 2c29 and 2e1, whereas the 3',4'-epoxy-FAA was formed by Cyps 2b9 and 3a11. The 4'-OH-FAA was generated by Cyps 1a2, 1b1, 2b9 and 2e1, and the 6-OH-FAA was formed by Cyps 1b1 and 2c9. Using the epoxide scavenger N-acetyl cysteine, 4'-OH-FAA, 3'-OH-FAA and 6-OH-FAA were shown to derive partly from non enzymatic isomerisation of their corresponding epoxides. The specific epoxide hydrolase inhibitor elaidamide allowed the confirmation that 3',4'-dihydrodiol-FAA was formed via the epoxide hydrolase. FAA treatment in vivo in mice led to a significant increase in the hepatic expression of Cyp1a2 (1.9-fold), 2e1 (2.1-fold), 2b10 (3.2-fold), 2d9 (2.3-fold) and 3a11 (2.2-fold), as evaluated by qRT-PCR. In conclusion, several Cyps were shown to be involved in FAA metabolism, particularly Cyps 3a11 and 2b9 which were responsible for the formation of the principal metabolites (5,6-epoxy-FAA, 3',4'-epoxy-FAA), and that FAA could induce the expression of several Cyps after in vivo administration. The possible implication of these enzymes in the in vivo anticancer activity of FAA in mice is discussed.

Published
2011

11. Identification and induction of cytochrome P450s involved in the metabolism of flavone-8-acetic acid in mice

Author

Pham, Minh Hien, Rhinn, Hervé, Auzeil, Nicolas, Regazzetti, Anne, Harami, Djamel Eddine, Scherman, Daniel, Chabot, Guy, Unité de pharmacologie chimique et génétique et d'imagerie (UPCGI - UMR 8151 / UMR_S 1022 ), Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Inserm, CNRS, and Institut National du Cancer (INCa)

Subjects
Flavonoids, MESH: Enzyme Induction, MESH: Microsomes, Liver, flavone-8-acetic acid, cytochrome P450, MESH: Epoxide Hydrolases, MESH: Hydroxylation, [SDV.CAN]Life Sciences [q-bio]/Cancer, MESH: Acetylcysteine, MESH: Mice, Inbred C57BL, MESH: Cytochrome P-450 Enzyme System, MESH: Animals, microsomes, metabolism, induction, MESH: Female, MESH: Flavonoids, MESH: Mice
Abstract

International audience; The metabolism of flavone-8-acetic acid (FAA) has been hypothesized to be partly responsible for its potent anticancer activity in mice. The purpose of this study was to identify the mouse enzymes involved in FAA Phase I metabolism and evaluate their possible induction in vivo by FAA. Mouse microsomes metabolized FAA into 6 metabolites: 3',4'-dihydrodiol-FAA, 5,6-epoxy-FAA, 4'-OH-FAA, 3'-OH-FAA, 3',4'-epoxy-FAA and 6-OH-FAA. Using Cyp-specific inhibitors (furafylline, Cyp1a2; α-naphthoflavone, Cyp1b1; tranylcypromine, Cyp2b9; quercetin, Cyp2c29; quinidine, 2d9; diethyldithiocarbamate, Cyp2e1; ketoconazole, Cyp3a11), the formation of 5,6-epoxy-FAA was mainly attributed to Cyps 1a2, 1b1, 2b9, 2c29 and 2e1, whereas the 3',4'-epoxy-FAA was formed by Cyps 2b9 and 3a11. The 4'-OH-FAA was generated by Cyps 1a2, 1b1, 2b9 and 2e1, and the 6-OH-FAA was formed by Cyps 1b1 and 2c9. Using the epoxide scavenger N-acetyl cysteine, 4'-OH-FAA, 3'-OH-FAA and 6-OH-FAA were shown to derive partly from non enzymatic isomerisation of their corresponding epoxides. The specific epoxide hydrolase inhibitor elaidamide allowed the confirmation that 3',4'-dihydrodiol-FAA was formed via the epoxide hydrolase. FAA treatment in vivo in mice led to a significant increase in the hepatic expression of Cyp1a2 (1.9-fold), 2e1 (2.1-fold), 2b10 (3.2-fold), 2d9 (2.3-fold) and 3a11 (2.2-fold), as evaluated by qRT-PCR. In conclusion, several Cyps were shown to be involved in FAA metabolism, particularly Cyps 3a11 and 2b9 which were responsible for the formation of the principal metabolites (5,6-epoxy-FAA, 3',4'-epoxy-FAA), and that FAA could induce the expression of several Cyps after in vivo administration. The possible implication of these enzymes in the in vivo anticancer activity of FAA in mice is discussed.

Published
2011

12. Fisetin disposition and metabolism in mice: Identification of geraldol as an active metabolite

Author

Touil, Yasmine, Auzeil, Nicolas, Boulinguez, François, Saighi, Hanane, Regazzetti, Anne, Scherman, Daniel, Chabot, Guy, Chabot, Guy, Unité de pharmacologie chimique et génétique et d'imagerie (UPCGI - UMR 8151 / UMR_S 1022 ), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Inserm, CNRS, and Institut National du Cancer (INCa)

Subjects
MESH: Cell Line, Tumor, fisetin, [SDV.CAN]Life Sciences [q-bio]/Cancer, [SDV.CAN] Life Sciences [q-bio]/Cancer, MESH: Glucuronides, MESH: Mice, Inbred C57BL, MESH: Collagen, MESH: Animals, MESH: Endothelial Cells, geraldol, MESH: Mice, MESH: Cell Movement, MESH: Angiogenesis Inhibitors, MESH: Drug Combinations, MESH: Carcinoma, Lewis Lung, MESH: Flavones, MESH: Laminin, MESH: Cell Survival, MESH: Proteoglycans, Flavonoid, cytotoxicity, MESH: Antineoplastic Agents, pharmacokinetics, metabolism, MESH: Female, MESH: Flavonoids, MESH: Neoplasm Transplantation
Abstract

International audience; Although the natural flavonoid fisetin (3,3',4',7-tetrahydroxyflavone) has been recently identified as an anticancer agent with antiangiogenic properties in mice, its in vivo pharmacokinetics and metabolism are presently not characterized. Our purpose was to determine the pharmacokinetics and metabolism of fisetin in mice and determine the biological activity of a detected fisetin metabolite. After fisetin administration of an efficacious dose of 223 mg/kg i.p. in mice, the maximum fisetin concentration reached 2.5 μg/ml at 15 min and the plasma concentration declined biphasically with a rapid half-life of 0.09 h and a terminal half-life of 3.1h. Three metabolites were detected, one of which was a glucuronide of fisetin (M1), whereas another glucuronide (M2) was a glucuronide of a previously unknown fisetin metabolite (M3). HPLC-MS/MS analysis indicated that M3 was a methoxylated metabolite of fisetin (MW=300 Da). The UV spectrum of M3 was identical to that of fisetin and standard 3,4',7-trihydroxy-3'-methoxyflavone (geraldol). In addition, because M3 co-eluted with standard geraldol in 4 different chromatographic ternary gradient conditions, M3 was therefore assigned to geraldol. Of interest, this metabolite was shown to achieve higher concentrations than fisetin in Lewis lung tumors. We also compared the cytotoxic and antiangiogenic activities of fisetin and geraldol in vitro and it was found that the latter was more cytotoxic than the parent compound toward tumor cells, and that it could also inhibit endothelial cells migration and proliferation. In conclusion, these results suggest that fisetin metabolism plays an important role in its in vivo anticancer activities.

Published
2011

13. Identification and induction of cytochrome P450s involved in the metabolism of flavone-8-acetic acid in mice.: Identification of mouse Cyps involved in FAA metabolism

Author

Pham, Minh Hien, Rhinn, Hervé, Auzeil, Nicolas, Regazzetti, Anne, Harami, Djamel Eddine, Scherman, Daniel, Chabot, Guy, Chabot, Guy, Unité de pharmacologie chimique et génétique et d'imagerie (UPCGI - UMR 8151 / UMR_S 1022 ), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Inserm, CNRS, and Institut National du Cancer (INCa)

Subjects
Flavonoids, MESH: Enzyme Induction, MESH: Microsomes, Liver, flavone-8-acetic acid, cytochrome P450, MESH: Epoxide Hydrolases, MESH: Hydroxylation, [SDV.CAN]Life Sciences [q-bio]/Cancer, MESH: Acetylcysteine, [SDV.CAN] Life Sciences [q-bio]/Cancer, MESH: Mice, Inbred C57BL, MESH: Cytochrome P-450 Enzyme System, MESH: Animals, microsomes, metabolism, induction, MESH: Female, MESH: Flavonoids, MESH: Mice
Abstract

International audience; The metabolism of flavone-8-acetic acid (FAA) has been hypothesized to be partly responsible for its potent anticancer activity in mice. The purpose of this study was to identify the mouse enzymes involved in FAA Phase I metabolism and evaluate their possible induction in vivo by FAA. Mouse microsomes metabolized FAA into 6 metabolites: 3',4'-dihydrodiol-FAA, 5,6-epoxy-FAA, 4'-OH-FAA, 3'-OH-FAA, 3',4'-epoxy-FAA and 6-OH-FAA. Using Cyp-specific inhibitors (furafylline, Cyp1a2; α-naphthoflavone, Cyp1b1; tranylcypromine, Cyp2b9; quercetin, Cyp2c29; quinidine, 2d9; diethyldithiocarbamate, Cyp2e1; ketoconazole, Cyp3a11), the formation of 5,6-epoxy-FAA was mainly attributed to Cyps 1a2, 1b1, 2b9, 2c29 and 2e1, whereas the 3',4'-epoxy-FAA was formed by Cyps 2b9 and 3a11. The 4'-OH-FAA was generated by Cyps 1a2, 1b1, 2b9 and 2e1, and the 6-OH-FAA was formed by Cyps 1b1 and 2c9. Using the epoxide scavenger N-acetyl cysteine, 4'-OH-FAA, 3'-OH-FAA and 6-OH-FAA were shown to derive partly from non enzymatic isomerisation of their corresponding epoxides. The specific epoxide hydrolase inhibitor elaidamide allowed the confirmation that 3',4'-dihydrodiol-FAA was formed via the epoxide hydrolase. FAA treatment in vivo in mice led to a significant increase in the hepatic expression of Cyp1a2 (1.9-fold), 2e1 (2.1-fold), 2b10 (3.2-fold), 2d9 (2.3-fold) and 3a11 (2.2-fold), as evaluated by qRT-PCR. In conclusion, several Cyps were shown to be involved in FAA metabolism, particularly Cyps 3a11 and 2b9 which were responsible for the formation of the principal metabolites (5,6-epoxy-FAA, 3',4'-epoxy-FAA), and that FAA could induce the expression of several Cyps after in vivo administration. The possible implication of these enzymes in the in vivo anticancer activity of FAA in mice is discussed.

Published
2011

14. On-resin cyclization of peptide ligands of the Vascular Endothelial Growth Factor Receptor 1 by copper(I)-catalyzed 1,3-dipolar azide–alkyne cycloaddition

Author

Pascale Coric, Anne Regazzetti, Michel Vidal, Benoit Gautier, Victor Goncalves, Nicolas Inguimbert, Serge Bouaziz, Christiane Garbay, Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon] (ICMUB), Université de Bourgogne (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Laboratoire de cristallographie et RMN biologiques (LCRB - UMR 8015), Université Paris Descartes - Paris 5 (UPD5)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Unité de Pharmacologie Chimique et Génétique (UPCG - UMR_S 640/UMR 8151), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut des sciences du Médicament -Toxicologie - Chimie - Environnement (IFR71), Institut de Recherche pour le Développement (IRD)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Pharmacochimie Moléculaire et Cellulaire (PMC - UMR_S 648), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Laboratoire de Chimie des Biomolécules et de l'Environnement (LCBE), Université Montpellier 1 (UM1)-Université de Perpignan Via Domitia (UPVD), Bouaziz, Serge, Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Descartes - Paris 5 (UPD5)-Institut des sciences du Médicament -Toxicologie - Chimie - Environnement (IFR71), Institut National de la Santé et de la Recherche Médicale (INSERM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Paris Descartes - Paris 5 (UPD5)-Institut de Chimie du CNRS (INC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Descartes - Paris 5 (UPD5)

Subjects
Models, Molecular, Vascular Endothelial Growth Factor A, MESH: Protein Structure, Quaternary, Clinical Biochemistry, Pharmaceutical Science, MESH: Amino Acid Sequence, Crystallography, X-Ray, Ligands, 01 natural sciences, Biochemistry, chemistry.chemical_compound, Drug Discovery, MESH: Ligands, MESH: Cyclization, Chromatography, High Pressure Liquid, chemistry.chemical_classification, [SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Structural Biology [q-bio.BM], MESH: Peptides, Cycloaddition, Cyclic peptide, MESH: Copper, Alkynes, 1,3-Dipolar cycloaddition, Click chemistry, Molecular Medicine, MESH: Models, Molecular, Protein Binding, Azides, Stereochemistry, [SDV.BBM.BS] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Structural Biology [q-bio.BM], Molecular Sequence Data, education, Alkyne, 010402 general chemistry, Catalysis, Growth factor receptor, MESH: Protein Binding, Amino Acid Sequence, Protein Structure, Quaternary, MESH: Chromatography, High Pressure Liquid, Molecular Biology, Vascular Endothelial Growth Factor Receptor-1, MESH: Molecular Sequence Data, MESH: Vascular Endothelial Growth Factor Receptor-1, 010405 organic chemistry, Ligand, MESH: Vascular Endothelial Growth Factor A, Organic Chemistry, MESH: Catalysis, MESH: Crystallography, X-Ray, MESH: Azides, 0104 chemical sciences, chemistry, Cyclization, Azide, Peptides, MESH: Alkynes, Copper
Abstract

International audience; Cyclic peptides were obtained, on-resin, by the copper (I) catalysed 1,3-dipolar cycloaddition of azides and alkynes. The reaction led exclusively to the formation of the expected cyclomonomeric products which acted as ligands of the Vascular Endothelial Growth Factor receptor 1.

Published
2007

15. ChemInform Abstract: First N-Alkyl Heterolysis of Tertiary Benzamides in Neutral Conditions

Author

Nicolas Auzeil, Martine Largeron, Alain Tomas, Maurice-Bernard Fleury, Laboratoire de Chimie et Toxicologie Analytique et Cellulaire (EA 4463), Université Paris Descartes - Paris 5 (UPD5), Laboratoire de cristallographie et RMN biologiques (LCRB - UMR 8015), Université Paris Descartes - Paris 5 (UPD5)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Cibles Thérapeutiques et conception de médicaments (CiTCoM - UMR 8038), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5), Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5), and Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_classification, 010405 organic chemistry, Chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Substituent, General Medicine, 010402 general chemistry, Cleavage (embryo), 01 natural sciences, Heterolysis, Medicinal chemistry, 0104 chemical sciences, 3. Good health, Hydrolysis, chemistry.chemical_compound, Nitrogen atom, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [CHIM]Chemical Sciences, lipids (amino acids, peptides, and proteins), Alkyl, ComputingMilieux_MISCELLANEOUS
Abstract

Tertiary benzamides 1–4 bearing a tricyclopropylmethyl substituent were synthesized and found to undergo rapid alkyl-nitrogen heterolysis at pH 7. X-Ray diffraction structural data for these amides revealed that their ability to give N-alkyl fission was not induced by the pyramidalization of the nitrogen atom, in contrast to what has been observed in the case of N-acyl cleavage (hydrolysis).

Published
2001

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