1
|
Bertaud A, Cens T, Chavanieu A, Estaran S, Rousset M, Soussi L, Ménard C, Kadala A, Collet C, Dutertre S, Bois P, Gosselin-Badaroudine P, Thibaud JB, Roussel J, Vignes M, Chahine M, Charnet P. Honeybee CaV4 has distinct permeation, inactivation, and pharmacology from homologous NaV channels. J Gen Physiol 2024; 156:e202313509. [PMID: 38557788 PMCID: PMC10983803 DOI: 10.1085/jgp.202313509] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 02/02/2024] [Accepted: 03/12/2024] [Indexed: 04/04/2024] Open
Abstract
DSC1, a Drosophila channel with sequence similarity to the voltage-gated sodium channel (NaV), was identified over 20 years ago. This channel was suspected to function as a non-specific cation channel with the ability to facilitate the permeation of calcium ions (Ca2+). A honeybee channel homologous to DSC1 was recently cloned and shown to exhibit strict selectivity for Ca2+, while excluding sodium ions (Na+), thus defining a new family of Ca2+ channels, known as CaV4. In this study, we characterize CaV4, showing that it exhibits an unprecedented type of inactivation, which depends on both an IFM motif and on the permeating divalent cation, like NaV and CaV1 channels, respectively. CaV4 displays a specific pharmacology with an unusual response to the alkaloid veratrine. It also possesses an inactivation mechanism that uses the same structural domains as NaV but permeates Ca2+ ions instead. This distinctive feature may provide valuable insights into how voltage- and calcium-dependent modulation of voltage-gated Ca2+ and Na+ channels occur under conditions involving local changes in intracellular calcium concentrations. Our study underscores the unique profile of CaV4 and defines this channel as a novel class of voltage-gated Ca2+ channels.
Collapse
Affiliation(s)
- Anaïs Bertaud
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Thierry Cens
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Alain Chavanieu
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Sébastien Estaran
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Matthieu Rousset
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Lisa Soussi
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Claudine Ménard
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Akelsso Kadala
- INRAE UR 406, Abeilles et Environnement, Domaine Saint Paul—Site Agroparc, Avignon, France
| | - Claude Collet
- INRAE UR 406, Abeilles et Environnement, Domaine Saint Paul—Site Agroparc, Avignon, France
| | - Sébastien Dutertre
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Patrick Bois
- Laboratoire PRéTI, UR 24184—UFR SFA Pôle Biologie Santé Bâtiment B36/B37, Université de Poitiers, Poitiers, France
| | | | - Jean-Baptiste Thibaud
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Julien Roussel
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Michel Vignes
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| | - Mohamed Chahine
- CERVO Brain Research Centre, Institut Universitaire en Santé Mentale de Québec, Quebec City, Canada
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, Montpellier, France
| |
Collapse
|
2
|
Folacci M, Estaran S, Ménard C, Bertaud A, Rousset M, Roussel J, Thibaud JB, Vignes M, Chavanieu A, Charnet P, Cens T. Functional Characterization of Four Known Cav2.1 Variants Associated with Neurodevelopmental Disorders. Membranes (Basel) 2023; 13:96. [PMID: 36676903 PMCID: PMC9864995 DOI: 10.3390/membranes13010096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Cav2.1 channels are expressed throughout the brain and are the predominant Ca2+ channels in the Purkinje cells. These cerebellar neurons fire spontaneously, and Cav2.1 channels are involved in the regular pacemaking activity. The loss of precision of the firing pattern of Purkinje cells leads to ataxia, a disorder characterized by poor balance and difficulties in performing coordinated movements. In this study, we aimed at characterizing functional and structural consequences of four variations (p.A405T in I-II loop and p.R1359W, p.R1667W and p.S1799L in IIIS4, IVS4, and IVS6 helices, respectively) identified in patients exhibiting a wide spectrum of disorders including ataxia symptoms. Functional analysis using two major Cav2.1 splice variants (Cav2.1+e47 and Cav2.1-e47) in Xenopus laevis oocytes, revealed a lack of effect upon A405T substitution and a significant loss-of-function caused by R1359W, whereas R1667W and S1799L caused both channel gain-of-function and loss-of-function, in a splice variant-dependent manner. Structural analysis revealed the loss of interactions with S1, S2, and S3 helices upon R1359W and R1667W substitutions, but a lack of obvious structural changes with S1799L. Computational modeling suggests that biophysical changes induced by Cav2.1 pathogenic mutations might affect action potential frequency in Purkinje cells.
Collapse
|
3
|
Brunello L, Ménard C, Rousset M, Vignes M, Charnet P, Cens T. Different efficiency of auxiliary/chaperone proteins to promote the functional reconstitution of honeybee glutamate and acetylcholine receptors in Xenopus laevis oocytes. Insect Mol Biol 2022; 31:620-633. [PMID: 35587772 PMCID: PMC9546428 DOI: 10.1111/imb.12791] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Heterologous expression systems (e.g., Xenopus laevis oocytes) are useful to study the biophysical properties and pharmacology of ionotropic receptors such as ionotropic glutamate (iGLuRs) and nicotinic acetylcholine (nAChRs) receptors. However, insect receptors often require the co-expression of chaperone proteins to be functional. Only few iGluRs and nAChRs have been successfully expressed in such systems. Here, we compared the efficiency of chaperone proteins to promote the functional expression of one Apis mellifera iGluR and several nAChR subunit combinations (α1α8β1, α7, α2α8β1 and α2α7α8β1) in Xenopus oocytes. To this end, we cloned a new iGluR (GluR-1) and potential chaperone proteins (e.g., SOL-1, Neto, NACHO) and tested more than 40 combinations of human, nematode and honeybee proteins. We obtained robust expression of GluR-1 and α1α8β1 when co-expressed with honeybee chaperone proteins and found that nAChR expression critically depended on the α1 subunit N-terminal sequence. We recorded small ACh-gated currents in few oocytes when the α7 subunit was co-expressed with Caenorhabditis elegans RIC-3, but none of the chaperone proteins allowed efficient expression of α2α8β1 or α2α7α8β1. Our results show that only some protein combinations can reconstitute functional receptors in Xenopus oocytes and that protein combination efficient in one species is not always efficient in another species.
Collapse
Affiliation(s)
- Lorène Brunello
- Intitut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCMMontpellierFrance
| | - Claudine Ménard
- Intitut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCMMontpellierFrance
| | - Matthieu Rousset
- Intitut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCMMontpellierFrance
| | - Michel Vignes
- Intitut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCMMontpellierFrance
| | - Pierre Charnet
- Intitut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCMMontpellierFrance
| | - Thierry Cens
- Intitut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCMMontpellierFrance
| |
Collapse
|
4
|
Rousset M, Humez S, Laurent C, Buée L, Blum D, Cens T, Vignes M, Charnet P. Mammalian Brain Ca2+ Channel Activity Transplanted into Xenopus laevis Oocytes. Membranes 2022; 12:membranes12050496. [PMID: 35629822 PMCID: PMC9146698 DOI: 10.3390/membranes12050496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/20/2022] [Accepted: 04/26/2022] [Indexed: 02/01/2023]
Abstract
Several mutations on neuronal voltage-gated Ca2+ channels (VGCC) have been shown to cause neurological disorders and contribute to the initiation of epileptic seizures, migraines, or cerebellar degeneration. Analysis of the functional consequences of these mutations mainly uses heterologously expressed mutated channels or transgenic mice which mimic these pathologies, since direct electrophysiological approaches on brain samples are not easily feasible. We demonstrate that mammalian voltage-gated Ca2+ channels from membrane preparation can be microtransplanted into Xenopus oocytes and can conserve their activity. This method, originally described to study the alteration of GABA receptors in human brain samples, allows the recording of the activity of membrane receptors and channels with their native post-translational processing, membrane environment, and regulatory subunits. The use of hippocampal, cerebellar, or cardiac membrane preparation displayed different efficacy for transplanted Ca2+ channel activity. This technique, now extended to the recording of Ca2+ channel activity, may therefore be useful in order to analyze the calcium signature of membrane preparations from unfixed human brain samples or normal and transgenic mice.
Collapse
Affiliation(s)
- Matthieu Rousset
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (T.C.); (M.V.)
- Correspondence: (M.R.); (P.C.); Tel.: +33-467-613-666 (M.R. & P.C.)
| | - Sandrine Humez
- Lille Neuroscience & Cognition, Université de Lille, F-59000 Lille, France; (S.H.); (C.L.); (L.B.); (D.B.)
- Inserm UMR_S1172, Jean-Pierre Aubert Research Centre, F-59000 Lille, France
- Lille Neuroscience & Cognition, Alzheimer & Tauopathies, CHU-Lille, F-59000 Lille, France
| | - Cyril Laurent
- Lille Neuroscience & Cognition, Université de Lille, F-59000 Lille, France; (S.H.); (C.L.); (L.B.); (D.B.)
- Inserm UMR_S1172, Jean-Pierre Aubert Research Centre, F-59000 Lille, France
- Lille Neuroscience & Cognition, Alzheimer & Tauopathies, CHU-Lille, F-59000 Lille, France
| | - Luc Buée
- Lille Neuroscience & Cognition, Université de Lille, F-59000 Lille, France; (S.H.); (C.L.); (L.B.); (D.B.)
- Inserm UMR_S1172, Jean-Pierre Aubert Research Centre, F-59000 Lille, France
- Lille Neuroscience & Cognition, Alzheimer & Tauopathies, CHU-Lille, F-59000 Lille, France
| | - David Blum
- Lille Neuroscience & Cognition, Université de Lille, F-59000 Lille, France; (S.H.); (C.L.); (L.B.); (D.B.)
- Inserm UMR_S1172, Jean-Pierre Aubert Research Centre, F-59000 Lille, France
- Lille Neuroscience & Cognition, Alzheimer & Tauopathies, CHU-Lille, F-59000 Lille, France
| | - Thierry Cens
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (T.C.); (M.V.)
| | - Michel Vignes
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (T.C.); (M.V.)
| | - Pierre Charnet
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (T.C.); (M.V.)
- Correspondence: (M.R.); (P.C.); Tel.: +33-467-613-666 (M.R. & P.C.)
| |
Collapse
|
5
|
Cens T, Chavanieu A, Bertaud A, Mokrane N, Estaran S, Roussel J, Ménard C, De Jesus Ferreira M, Guiramand J, Thibaud J, Cohen‐Solal C, Rousset M, Rolland V, Vignes M, Charnet P. Molecular Targets of Neurotoxic Insecticides in
Apis mellifera. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Thierry Cens
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Alain Chavanieu
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Anaïs Bertaud
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Nawfel Mokrane
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Sébastien Estaran
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Julien Roussel
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Claudine Ménard
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | | | - Janique Guiramand
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Jean‐Baptiste Thibaud
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Catherine Cohen‐Solal
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Matthieu Rousset
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Valérie Rolland
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Michel Vignes
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron Université de Montpellier, CNRS, ENSCM 1919 Route de Mende 34293 Montpellier France
| |
Collapse
|
6
|
Bertaud A, Cens T, Mary R, Rousset M, Arel E, Thibaud JB, Vignes M, Ménard C, Dutertre S, Collet C, Charnet P. Xenopus Oocytes: A Tool to Decipher Molecular Specificity of Insecticides towards Mammalian and Insect GABA—A Receptors. Membranes 2022; 12:membranes12050440. [PMID: 35629767 PMCID: PMC9146934 DOI: 10.3390/membranes12050440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 04/09/2022] [Accepted: 04/11/2022] [Indexed: 11/16/2022]
Abstract
The number of insect GABA receptors (GABAr) available for expression studies has been recently increased by the cloning of the Acyrthosiphon pisum (pea aphid) RDL subunits. This large number of cloned RDL subunits from pest and beneficial insects opens the door to parallel pharmacological studies on the sensitivity of these different insect GABAr to various agonists or antagonists. The resulting analysis of the molecular basis of the species-specific GABAr responses to insecticides is necessary not only to depict and understand species toxicity, but also to help at the early identification of unacceptable toxicity of insecticides toward beneficial insects such as Apis mellifera (honeybees). Using heterologous expression in Xenopus laevis oocytes, and two-electrode voltage-clamp recording to assess the properties of the GABAr, we performed a comparative analysis of the pharmacological sensitivity of RDL subunits from A. pisum, A. mellifera and Varroa destructor GABAr to three pesticides (fipronil, picrotoxin and dieldrin). These data were compared to similar characterizations performed on two Homo sapiens GABA-A receptors (α2β2γ2 and α2β2γ2). Our results underline a global conservation of the pharmacological profiles of these receptors, with some interesting species specificities, nonetheless, and suggest that this approach can be useful for the early identification of poorly specific molecules.
Collapse
Affiliation(s)
- Anaïs Bertaud
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Thierry Cens
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Rosanna Mary
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Matthieu Rousset
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Elodie Arel
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Jean-Baptiste Thibaud
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Michel Vignes
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Claudine Ménard
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Sébastien Dutertre
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
| | - Claude Collet
- INRAE, UR 406, Abeilles et Environnement, Domaine St. Paul, Site Agroparc, 84140 Avignon, France;
| | - Pierre Charnet
- IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France; (A.B.); (T.C.); (R.M.); (M.R.); (E.A.); (J.-B.T.); (M.V.); (C.M.); (S.D.)
- Correspondence:
| |
Collapse
|
7
|
Sebih F, Mokrane N, Fontanel P, Kayatekin M, Kaabeche M, Guiramand J, Cohen-Solal C, Cens T, Rousset M, Charnet P, De Jésus Ferreira MC, Thibaud JB, Ménard C, Cantel S, Rolland V, Vignes M, Roussel J. The Glutathione Metabolite γ-Glutamyl-Glutamate Partially Activates Glutamate NMDA Receptors in Central Neurons With Higher Efficacy for GluN2B-Containing Receptors. Front Pharmacol 2022; 12:794680. [PMID: 35046818 PMCID: PMC8763386 DOI: 10.3389/fphar.2021.794680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 11/18/2021] [Indexed: 12/30/2022] Open
Abstract
Gamma-L-glutamyl-L-glutamate (γ-Glu-Glu) was synthetized and further characterized for its activity on cultured neurons. We observed that γ-Glu-Glu elicited excitatory effects on neurons likely by activating mainly the N-methyl-D-aspartate (NMDA) receptors. These effects were dependent on the integrity of synaptic transmission as they were blocked by tetrodotoxin (TTX). We next evaluated its activity on NMDA receptors by testing it on cells expressing these receptors. We observed that γ-Glu-Glu partially activated NMDA receptors and exhibited better efficacy for NMDA receptors containing the GluN2B subunit. Moreover, at low concentration, γ-Glu-Glu potentiated the responses of glutamate on NMDA receptors. Finally, the endogenous production of γ-Glu-Glu was measured by LC-MS on the extracellular medium of C6 rat astroglioma cells. We found that extracellular γ-Glu-Glu concentration was, to some extent, directly linked to GSH metabolism as γ-Glu-Glu can be a by-product of glutathione (GSH) breakdown after γ-glutamyl transferase action. Therefore, γ-Glu-Glu could exert excitatory effects by activating neuronal NMDA receptors when GSH production is enhanced.
Collapse
Affiliation(s)
- Fatiha Sebih
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | - Nawfel Mokrane
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | | | - Mete Kayatekin
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | | | | | | | - Thierry Cens
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | | | - Pierre Charnet
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | | | | | | | - Sonia Cantel
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | | | - Michel Vignes
- UMR5247 IBMM University of Montpellier, Montpellier, France
| | - Julien Roussel
- UMR5247 IBMM University of Montpellier, Montpellier, France
| |
Collapse
|
8
|
Mokrane N, Snabi Y, Cens T, Guiramand J, Charnet P, Bertaud A, Menard C, Rousset M, de Jesus Ferreira MC, Thibaud JB, Cohen-Solal C, Vignes M, Roussel J. Manipulations of Glutathione Metabolism Modulate IP 3-Mediated Store-Operated Ca 2+ Entry on Astroglioma Cell Line. Front Aging Neurosci 2022; 13:785727. [PMID: 34975458 PMCID: PMC8719003 DOI: 10.3389/fnagi.2021.785727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/01/2021] [Indexed: 02/03/2023] Open
Abstract
The regulation of the redox status involves the activation of intracellular pathways as Nrf2 which provides hormetic adaptations against oxidative stress in response to environmental stimuli. In the brain, Nrf2 activation upregulates the formation of glutathione (GSH) which is the primary antioxidant system mainly produced by astrocytes. Astrocytes have also been shown to be themselves the target of oxidative stress. However, how changes in the redox status itself could impact the intracellular Ca2+ homeostasis in astrocytes is not known, although this could be of great help to understand the neuronal damage caused by oxidative stress. Indeed, intracellular Ca2+ changes in astrocytes are crucial for their regulatory actions on neuronal networks. We have manipulated GSH concentration in astroglioma cells with selective inhibitors and activators of the enzymes involved in the GSH cycle and analyzed how this could modify Ca2+ homeostasis. IP3-mediated store-operated calcium entry (SOCE), obtained after store depletion elicited by Gq-linked purinergic P2Y receptors activation, are either sensitized or desensitized, following GSH depletion or increase, respectively. The desensitization may involve decreased expression of the proteins STIM2, Orai1, and Orai3 which support SOCE mechanism. The sensitization process revealed by exposing cells to oxidative stress likely involves the increase in the activity of Calcium Release-Activated Channels (CRAC) and/or in their membrane expression. In addition, we observe that GSH depletion drastically impacts P2Y receptor-mediated changes in membrane currents, as evidenced by large increases in Ca2+-dependent K+ currents. We conclude that changes in the redox status of astrocytes could dramatically modify Ca2+ responses to Gq-linked GPCR activation in both directions, by impacting store-dependent Ca2+-channels, and thus modify cellular excitability under purinergic stimulation.
Collapse
Affiliation(s)
- Nawfel Mokrane
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | - Yassin Snabi
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | - Thierry Cens
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France
| | - Janique Guiramand
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France
| | - Pierre Charnet
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France
| | - Anaïs Bertaud
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | - Claudine Menard
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | - Matthieu Rousset
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France
| | - Marie-Céleste de Jesus Ferreira
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | | | - Catherine Cohen-Solal
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | - Michel Vignes
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| | - Julien Roussel
- UMR 5247 Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,Department of Biological Sciences, Université de Montpellier, Montpellier, France
| |
Collapse
|
9
|
Henry C, Cens T, Charnet P, Cohen-Solal C, Collet C, van-Dijk J, Guiramand J, de Jésus-Ferreira MC, Menard C, Mokrane N, Roussel J, Thibault JB, Vignes M, Rousset M. Heterogeneous expression of GABA receptor-like subunits LCCH3 and GRD reveals functional diversity of GABA receptors in the honeybee Apis mellifera. Br J Pharmacol 2020; 177:3924-3940. [PMID: 32436264 DOI: 10.1111/bph.15135] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 04/24/2020] [Accepted: 05/09/2020] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND AND PURPOSE Despite a growing awareness, annual losses of honeybee colonies worldwide continue to reach threatening levels for food safety and global biodiversity. Among the biotic and abiotic stresses probably responsible for these losses, pesticides, including those targeting ionotropic GABA receptors, are one of the major drivers. Most insect genomes include the ionotropic GABA receptor subunit gene, Rdl, and two GABA-like receptor subunit genes, Lcch3 and Grd. Most studies have focused on Rdl which forms homomeric GABA-gated chloride channels, and a complete analysis of all possible molecular combinations of GABA receptors is still lacking. EXPERIMENTAL APPROACH We cloned the Rdl, Grd, and Lcch3 genes of Apis mellifera and systematically characterized the resulting GABA receptors expressed in Xenopus oocytes, using electrophysiological assays, fluorescence microscopy and co-immunoprecipitation techniques. KEY RESULTS The cloned subunits interacted with each other, forming GABA-gated heteromeric channels with particular properties. Strikingly, these heteromers were always more sensitive than AmRDL homomer to all the pharmacological agents tested. In particular, when expressed together, Grd and Lcch3 form a non-selective cationic channel that opens at low concentrations of GABA and with sensitivity to insecticides similar to that of homomeric Rdl channels. CONCLUSION AND IMPLICATIONS For off-target species like the honeybee, chronic sublethal exposure to insecticides constitutes a major threat. At these concentration ranges, homomeric RDL receptors may not be the most pertinent target to study and other ionotropic GABA receptor subtypes should be considered in order to understand more fully the molecular mechanisms of sublethal toxicity to insecticides.
Collapse
Affiliation(s)
| | - Thierry Cens
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| | - Pierre Charnet
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| | | | - Claude Collet
- UR 406 Abeilles et Environnement, INRAE, Avignon Cedex 9, France
| | | | | | | | - Claudine Menard
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| | - Nawfel Mokrane
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| | - Julien Roussel
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| | | | - Michel Vignes
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| | - Matthieu Rousset
- IBMM UMR5247, University of Montpellier, CNRS, Montpellier, France
| |
Collapse
|
10
|
Ménard C, Charnet P, Rousset M, Vignes M, Cens T. Cav2.1 C-terminal fragments produced in Xenopus laevis oocytes do not modify the channel expression and functional properties. Eur J Neurosci 2020; 51:1900-1913. [PMID: 31981388 DOI: 10.1111/ejn.14685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 01/10/2020] [Accepted: 01/17/2020] [Indexed: 12/01/2022]
Abstract
The sequence and genomic organization of the CACNA1A gene that encodes the Cav2.1 subunit of both P and Q-type Ca2+ channels are well conserved in mammals. In human, rat and mouse CACNA1A, the use of an alternative acceptor site at the exon 46-47 boundary results in the expression of a long Cav2.1 splice variant. In transfected cells, the long isoform of human Cav2.1 produces a C-terminal fragment, but it is not known whether this fragment affects Cav2.1 expression or functional properties. Here, we cloned the long isoform of rat Cav2.1 (Cav2.1(e47)) and identified a novel variant with a shorter C-terminus (Cav2.1(e47s)) that differs from those previously described in the rat and mouse. When expressed in Xenopus laevis oocytes, Cav2.1(e47) and Cav2.1(e47s) displayed similar functional properties as the short isoform (Cav2.1). We show that Cav2.1 isoforms produced short (CT1) and long (CT1(e47)) C-terminal fragments that interacted in vivo with the auxiliary Cavβ4a subunit. Overexpression of the C-terminal fragments did not affect Cav2.1 expression and functional properties. Furthermore, the functional properties of a Cav2.1 mutant without the C-terminal Cavβ4 binding domain (Cav2.1ΔCT2) were similar to those of Cav2.1 and were not influenced by the co-expression of the missing fragments (CT2 or CT2(e47)). Our results exclude a functional role of the C-terminal fragments in Cav2.1 biophysical properties in an expression system widely used to study this channel.
Collapse
Affiliation(s)
- Claudine Ménard
- Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,IBMM, Université de Montpellier, Montpellier, France
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,IBMM, Université de Montpellier, Montpellier, France
| | - Matthieu Rousset
- Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,IBMM, Université de Montpellier, Montpellier, France
| | - Michel Vignes
- Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,IBMM, Université de Montpellier, Montpellier, France
| | - Thierry Cens
- Institut des Biomolécules Max Mousseron (IBMM), Montpellier, France.,IBMM, Université de Montpellier, Montpellier, France
| |
Collapse
|
11
|
Segovia M, Russo S, Jeldres M, Mahmoud YD, Perez V, Duhalde M, Charnet P, Rousset M, Victoria S, Veigas F, Louvet C, Vanhove B, Floto RA, Anegon I, Cuturi MC, Girotti MR, Rabinovich GA, Hill M. Targeting TMEM176B Enhances Antitumor Immunity and Augments the Efficacy of Immune Checkpoint Blockers by Unleashing Inflammasome Activation. Cancer Cell 2019; 35:767-781.e6. [PMID: 31085177 PMCID: PMC6521897 DOI: 10.1016/j.ccell.2019.04.003] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 02/20/2019] [Accepted: 04/10/2019] [Indexed: 01/01/2023]
Abstract
Although immune checkpoint blockers have yielded significant clinical benefits in patients with different malignancies, the efficacy of these therapies is still limited. Here, we show that disruption of transmembrane protein 176B (TMEM176B) contributes to CD8+ T cell-mediated tumor growth inhibition by unleashing inflammasome activation. Lack of Tmem176b enhances the antitumor activity of anti-CTLA-4 antibodies through mechanisms involving caspase-1/IL-1β activation. Accordingly, patients responding to checkpoint blockade therapies display an activated inflammasome signature. Finally, we identify BayK8644 as a potent TMEM176B inhibitor that promotes CD8+ T cell-mediated tumor control and reinforces the antitumor activity of both anti-CTLA-4 and anti-PD-1 antibodies. Thus, pharmacologic de-repression of the inflammasome by targeting TMEM176B may enhance the therapeutic efficacy of immune checkpoint blockers.
Collapse
Affiliation(s)
- Mercedes Segovia
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay; Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
| | - Sofia Russo
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay; Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
| | - Mathias Jeldres
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Yamil D Mahmoud
- Laboratories of Immunopathology and Translational Immuno-Oncology, Institute of Biology and Experimental Medicine (IBYME), National Council of Scientific and Technical Investigations (CONICET), C1428 Buenos Aires, Argentina
| | - Valentina Perez
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay; Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
| | - Maite Duhalde
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS ENSCM, Université de Montpellier, 34093 Montpellier, France
| | - Matthieu Rousset
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS ENSCM, Université de Montpellier, 34093 Montpellier, France
| | - Sabina Victoria
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Florencia Veigas
- Laboratories of Immunopathology and Translational Immuno-Oncology, Institute of Biology and Experimental Medicine (IBYME), National Council of Scientific and Technical Investigations (CONICET), C1428 Buenos Aires, Argentina
| | - Cédric Louvet
- INSERM UMR 1064, Center for Research in Transplantation and Immunology, Université de Nantes, CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), 44093 Nantes, France
| | - Bernard Vanhove
- INSERM UMR 1064, Center for Research in Transplantation and Immunology, Université de Nantes, CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), 44093 Nantes, France; Xenothera, 44093 Nantes, France
| | - R Andrés Floto
- Molecular Immunity Unit, Department of Medicine, University of Cambridge, CB2 0QH Cambridge, UK
| | - Ignacio Anegon
- INSERM UMR 1064, Center for Research in Transplantation and Immunology, Université de Nantes, CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), 44093 Nantes, France
| | - Maria Cristina Cuturi
- INSERM UMR 1064, Center for Research in Transplantation and Immunology, Université de Nantes, CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), 44093 Nantes, France.
| | - M Romina Girotti
- Laboratories of Immunopathology and Translational Immuno-Oncology, Institute of Biology and Experimental Medicine (IBYME), National Council of Scientific and Technical Investigations (CONICET), C1428 Buenos Aires, Argentina
| | - Gabriel A Rabinovich
- Laboratories of Immunopathology and Translational Immuno-Oncology, Institute of Biology and Experimental Medicine (IBYME), National Council of Scientific and Technical Investigations (CONICET), C1428 Buenos Aires, Argentina; Department of Biological Chemistry, School of Exact and Natural Sciences, University of Buenos Aires, C1428 Buenos Aires, Argentina
| | - Marcelo Hill
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay; Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay.
| |
Collapse
|
12
|
Ménard C, Folacci M, Brunello L, Charreton M, Collet C, Mary R, Rousset M, Thibaud JB, Vignes M, Charnet P, Cens T. Multiple combinations of RDL subunits diversify the repertoire of GABA receptors in the honey bee parasite Varroa destructor. J Biol Chem 2018; 293:19012-19024. [PMID: 30333227 DOI: 10.1074/jbc.ra118.005365] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/16/2018] [Indexed: 12/22/2022] Open
Abstract
In insects, γ-aminobutyric acid (GABA) is the major inhibitory neurotransmitter, and GABA-gated ion channels are the target of different classes of insecticides, including fipronil. We report here the cloning of six subunits (four RDL, one LCCH3, and one GRD) that constitute the repertoire of the GABA-gated ion channel family of the Varroa mite (Varroa destructor), a honey bee ectoparasite. We also isolated a truncated GRD subunit with a premature stop codon. We found that when expressed in Xenopus laevis oocytes, three of the four RDL subunits (VdesRDL1, VdesRDL2, and VdesRDL3) formed functional, homomultimeric anionic receptors, whereas GRD and LCCH3 produced heteromultimeric cationic receptors. These receptors displayed specific sensitivities toward GABA and fipronil, and VdesRDL1 was the most resistant to the insecticide. We identified specific residues in the VdesRDL1 pore-lining region that explain its high resistance to fipronil. VdesRDL4 did not form a functional receptor when expressed alone, but it assembled with VdesRDL1 to form a heteromultimeric receptor with properties distinct from those of the VdesRDL1 homomultimeric receptor. Moreover, VdesRDL1 physically interacted with VdesRDL3, generating a heteromultimeric receptor combining properties of both subunits. On the other hand, we did not detect any functional interaction between VdesLCCH3 and the VdesRDL subunits, an observation that differed from what was previously reported for Drosophila melanogaster In conclusion, this study provides insights relevant to improve our understanding of the precise role of GABAergic signaling in insects and new tools for the development of Varroa mite-specific insecticidal agents that do not harm honey bees.
Collapse
Affiliation(s)
- Claudine Ménard
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Mathilde Folacci
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Lorène Brunello
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Mercedes Charreton
- the INRA UR 406 Abeilles et Environnement, 84914 Avignon cedex 9, France
| | - Claude Collet
- the INRA UR 406 Abeilles et Environnement, 84914 Avignon cedex 9, France
| | - Rosanna Mary
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Matthieu Rousset
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Jean-Baptiste Thibaud
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Michel Vignes
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Pierre Charnet
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| | - Thierry Cens
- From the Institut des Biomolécules Max Mousseron, UMR5247, CNRS, Université de Montpellier, 34095 Montpellier cedex 5, France and
| |
Collapse
|
13
|
Sebih F, Rousset M, Bellahouel S, Rolland M, de Jesus Ferreira MC, Guiramand J, Cohen-Solal C, Barbanel G, Cens T, Abouazza M, Tassou A, Gratuze M, Meusnier C, Charnet P, Vignes M, Rolland V. Characterization of l-Theanine Excitatory Actions on Hippocampal Neurons: Toward the Generation of Novel N-Methyl-d-aspartate Receptor Modulators Based on Its Backbone. ACS Chem Neurosci 2017; 8:1724-1734. [PMID: 28511005 DOI: 10.1021/acschemneuro.7b00036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
l-Theanine (or l-γ-N-ethyl-glutamine) is the major amino acid found in Camellia sinensis. It has received much attention because of its pleiotropic physiological and pharmacological activities leading to health benefits in humans, especially. We describe here a new, easy, efficient, and environmentally friendly chemical synthesis of l-theanine and l-γ-N-propyl-Gln and their corresponding d-isomers. l-Theanine, and its derivatives obtained so far, exhibited partial coagonistic action at N-methyl-d-aspartate (NMDA) receptors, with no detectable agonist effect at other glutamate receptors, on cultured hippocampal neurons. This activity was retained on NMDA receptors expressed in Xenopus oocytes. In addition, both GluN2A and GluN2B containing NMDA receptors were equally modulated by l-theanine. The stereochemical change from l-theanine to d-theanine along with the substitution of the ethyl for a propyl moiety in the γ-N position of l- and d-theanine significantly enhanced the biological efficacy, as measured on cultured hippocampal neurons. l-Theanine structure thus represents an interesting backbone to develop novel NMDA receptor modulators.
Collapse
Affiliation(s)
- Fatiha Sebih
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
- Laboratoire de Synthèse Organique Appliquée LSOA, Département
de Chimie, Université d’Oran 1 Ahmed Ben Bella, BP 1524 El M’Naouer, Oran 31000, Algeria
| | - Matthieu Rousset
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Salima Bellahouel
- Laboratoire de Synthèse Organique Appliquée LSOA, Département
de Chimie, Université d’Oran 1 Ahmed Ben Bella, BP 1524 El M’Naouer, Oran 31000, Algeria
| | - Marc Rolland
- IEM-UMR5635, CNRS-UM-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | | | - Janique Guiramand
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | | | - Gérard Barbanel
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Thierry Cens
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Mohammed Abouazza
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Adrien Tassou
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Maud Gratuze
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Céline Meusnier
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Pierre Charnet
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Michel Vignes
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| | - Valérie Rolland
- *IBMM-UMR5247, UM-CNRS-ENSCM, Place E. Bataillon, 34095 Cedex 5 Montpellier, France
| |
Collapse
|
14
|
Rincent R, Kuhn E, Monod H, Oury FX, Rousset M, Allard V, Le Gouis J. Optimization of multi-environment trials for genomic selection based on crop models. Theor Appl Genet 2017; 130:1735-1752. [PMID: 28540573 PMCID: PMC5511605 DOI: 10.1007/s00122-017-2922-4] [Citation(s) in RCA: 10] [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] [Received: 01/23/2017] [Accepted: 05/11/2017] [Indexed: 05/20/2023]
Abstract
We propose a statistical criterion to optimize multi-environment trials to predict genotype × environment interactions more efficiently, by combining crop growth models and genomic selection models. Genotype × environment interactions (GEI) are common in plant multi-environment trials (METs). In this context, models developed for genomic selection (GS) that refers to the use of genome-wide information for predicting breeding values of selection candidates need to be adapted. One promising way to increase prediction accuracy in various environments is to combine ecophysiological and genetic modelling thanks to crop growth models (CGM) incorporating genetic parameters. The efficiency of this approach relies on the quality of the parameter estimates, which depends on the environments composing this MET used for calibration. The objective of this study was to determine a method to optimize the set of environments composing the MET for estimating genetic parameters in this context. A criterion called OptiMET was defined to this aim, and was evaluated on simulated and real data, with the example of wheat phenology. The MET defined with OptiMET allowed estimating the genetic parameters with lower error, leading to higher QTL detection power and higher prediction accuracies. MET defined with OptiMET was on average more efficient than random MET composed of twice as many environments, in terms of quality of the parameter estimates. OptiMET is thus a valuable tool to determine optimal experimental conditions to best exploit MET and the phenotyping tools that are currently developed.
Collapse
Affiliation(s)
- R Rincent
- INRA, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 5 chemin de Beaulieu, 63100, Clermont-Ferrand, France.
- Université Blaise Pascal, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 63178, Aubière Cedex, France.
| | - E Kuhn
- INRA, MaIAGE, INRA, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - H Monod
- INRA, MaIAGE, INRA, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - F-X Oury
- INRA, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 5 chemin de Beaulieu, 63100, Clermont-Ferrand, France
- Université Blaise Pascal, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 63178, Aubière Cedex, France
| | - M Rousset
- INRA, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 5 chemin de Beaulieu, 63100, Clermont-Ferrand, France
- Université Blaise Pascal, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 63178, Aubière Cedex, France
| | - V Allard
- INRA, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 5 chemin de Beaulieu, 63100, Clermont-Ferrand, France
- Université Blaise Pascal, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 63178, Aubière Cedex, France
| | - J Le Gouis
- INRA, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 5 chemin de Beaulieu, 63100, Clermont-Ferrand, France
- Université Blaise Pascal, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 63178, Aubière Cedex, France
| |
Collapse
|
15
|
Oury FX, Lasme P, Michelet C, Dubat A, Gardet O, Heumez E, Rolland B, Rousset M, Abecassis J, Bar L'Helgouac'h C, Lullien-Pellerin V. Bread wheat milling behavior: effects of genetic and environmental factors, and modeling using grain mechanical resistance traits. Theor Appl Genet 2017; 130:929-950. [PMID: 28204843 DOI: 10.1007/s00122-017-2861-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 01/17/2017] [Indexed: 06/06/2023]
Abstract
Genetic (Pinb-D1 alleles) and environment (through vitreousness) have important effects on bread wheat milling behavior. SKCS optimal values corresponding to soft vitreous or hard mealy grains were defined to obtain the highest total flour yield. Near-isogenic lines of bread wheat that differ in hardness, due to distinct puroindoline-b alleles (the wild type, Pinb-D1a, or the mutated forms, Pinb-D1b or Pinb-D1d), were grown in different environments and under two nitrogen fertilization levels, to study genetic and environmental effects on milling behavior. Milling tests used a prototype mill, equipped with two break steps, one sizing step, and two reduction steps, and this enabled 21 individual or aggregated milling fractions to be collected. Four current grain characters, thousand grain weight, test weight, grain diameter, and protein content, were measured, and three characters known to influence grain mechanical resistance, NIRS hardness, SKCS hardness index, and grain vitreousness (a character affecting the grain mechanical behavior but generally not studied). As expected, the wild type or mutated forms of Pinb-D1 alleles led to contrasted milling behavior: soft genotypes produced high quantities of break flour and low quantities of reduction flour, whereas reverse quantities were observed for hard genotypes. This different milling behavior had only a moderate influence on total flour production. NIRS hardness and vitreousness were, respectively, the most important and the second most important grain characters to explain milling behavior. However, contrary to NIRS hardness, vitreousness was only involved in endosperm reduction and not in the separation between the starchy endosperm and the outer layers. The highest flour yields were obtained for SKCS values comprised between 30 and 50, which corresponded either to soft vitreous or hard mealy grains. Prediction equations were defined and showed a good accuracy estimating break and reduction flours portions, but should be used more cautiously for total flour.
Collapse
Affiliation(s)
- François-Xavier Oury
- INRA, UMR 1095, Génétique Diversité et Ecophysiologie des Céréales, 5 Chemin de Beaulieu, 63100, Clermont-Ferrand, France.
| | - P Lasme
- UMR IATE, CIRAD, INRA, Montpellier SupAgro, Université de Montpellier, 34060, Montpellier, France
| | - C Michelet
- UFS, 17 Rue du Louvre, 75001, Paris, France
| | - A Dubat
- CHOPIN Technologies, 20 Avenue Marcellin Berthelot, 92390, Villeneuve-la-Garenne, France
| | - O Gardet
- URAO63, Domaine de Crouelle, 5 Chemin de Beaulieu, 63100, Clermont-Ferrand, France
| | - E Heumez
- INRA, UE 972, Grandes Cultures Innovation Environnement, 2 Chaussée Brunehaut, 80200, Estrées-Mons, France
| | - B Rolland
- INRA, UMR 1349, Institut de Génétique Environnement et Protection des Plantes, Domaine de la Motte, 35653, Le Rheu, France
| | - M Rousset
- INRA, UMR 320, Génétique Quantitative et Evolution, Ferme du Moulon, 91190, Gif-sur-Yvette, France
| | - J Abecassis
- UMR IATE, CIRAD, INRA, Montpellier SupAgro, Université de Montpellier, 34060, Montpellier, France
| | - C Bar L'Helgouac'h
- ARVALIS-Institut du végétal, Station Expérimentale, 91720, Boigneville, France
| | - V Lullien-Pellerin
- UMR IATE, CIRAD, INRA, Montpellier SupAgro, Université de Montpellier, 34060, Montpellier, France
| |
Collapse
|
16
|
Lapierre A, Lorchel F, Boisselier P, Fleury B, Craighero F, Deberne M, Gascou G, Rousset M, Favrel V, Pialat J, Ardiet J, Céruse P, Chapet O. EP-1029: Improved interobserver reproducibility in nasopharyngeal tumor delineation using a reference GTV. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31465-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
17
|
Gosselin-Badaroudine P, Moreau A, Simard L, Cens T, Rousset M, Collet C, Charnet P, Chahine M. Biophysical characterization of the honeybee DSC1 orthologue reveals a novel voltage-dependent Ca2+ channel subfamily: CaV4. J Gen Physiol 2016; 148:133-45. [PMID: 27432995 PMCID: PMC4969797 DOI: 10.1085/jgp.201611614] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 06/29/2016] [Indexed: 12/19/2022] Open
Abstract
Insect DSC1 channels have sequences that are intermediate between voltage-gated Na+ and Ca2+ channels but have hitherto been classified as the former. Gosselin-Badaroudine et al. clone and characterize honeybee DSC1, revealing high selectivity for Ca2+ and suggesting reclassification of DSC1 homologues as Ca2+ channels. Bilaterian voltage-gated Na+ channels (NaV) evolved from voltage-gated Ca2+ channels (CaV). The Drosophila melanogaster Na+ channel 1 (DSC1), which features a D-E-E-A selectivity filter sequence that is intermediate between CaV and NaV channels, is evidence of this evolution. Phylogenetic analysis has classified DSC1 as a Ca2+-permeable Na+ channel belonging to the NaV2 family because of its sequence similarity with NaV channels. This is despite insect NaV2 channels (DSC1 and its orthologue in Blatella germanica, BSC1) being more permeable to Ca2+ than Na+. In this study, we report the cloning and molecular characterization of the honeybee (Apis mellifera) DSC1 orthologue. We reveal several sequence variations caused by alternative splicing, RNA editing, and genomic variations. Using the Xenopus oocyte heterologous expression system and the two-microelectrode voltage-clamp technique, we find that the channel exhibits slow activation and inactivation kinetics, insensitivity to tetrodotoxin, and block by Cd2+ and Zn2+. These characteristics are reminiscent of CaV channels. We also show a strong selectivity for Ca2+ and Ba2+ ions, marginal permeability to Li+, and impermeability to Mg2+ and Na+ ions. Based on current ion channel nomenclature, the D-E-E-A selectivity filter, and the properties we have uncovered, we propose that DSC1 homologues should be classified as CaV4 rather than NaV2. Indeed, channels that contain the D-E-E-A selectivity sequence are likely to feature the same properties as the honeybee’s channel, namely slow activation and inactivation kinetics and strong selectivity for Ca2+ ions.
Collapse
Affiliation(s)
| | - Adrien Moreau
- Centre de Recherche, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec G1J 2G3, Canada
| | - Louis Simard
- Centre de Recherche, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec G1J 2G3, Canada
| | - Thierry Cens
- Institut des Biomolécules Max Mousseron, Centre National de la Recherche Scientifique UMR 5247, 1919 Montpellier, France
| | - Matthieu Rousset
- Institut des Biomolécules Max Mousseron, Centre National de la Recherche Scientifique UMR 5247, 1919 Montpellier, France
| | - Claude Collet
- INRA UR 406, Abeilles et Environnement, Domaine Saint Paul - Site Agroparc, 84914 Avignon, France
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron, Centre National de la Recherche Scientifique UMR 5247, 1919 Montpellier, France
| | - Mohamed Chahine
- Centre de Recherche, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec G1J 2G3, Canada Department of Medicine, Université Laval, Quebec City, Quebec G1K 7P4, Canada
| |
Collapse
|
18
|
Dauvilliers Y, Evangelista E, Lopez R, Barateau L, Jaussent I, Cens T, Rousset M, Charnet P. Absence of γ-aminobutyric acid-a receptor potentiation in central hypersomnolence disorders. Ann Neurol 2016; 80:259-68. [DOI: 10.1002/ana.24710] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 06/07/2016] [Accepted: 06/07/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Yves Dauvilliers
- National Reference Network for Narcolepsy, Department of Neurology, Guy de Chauliac Hospital; Montpellier University Hospital Center
- Inserm, U1061, Montpellier; Université Montpellier; France
| | - Elisa Evangelista
- National Reference Network for Narcolepsy, Department of Neurology, Guy de Chauliac Hospital; Montpellier University Hospital Center
| | - Regis Lopez
- National Reference Network for Narcolepsy, Department of Neurology, Guy de Chauliac Hospital; Montpellier University Hospital Center
- Inserm, U1061, Montpellier; Université Montpellier; France
| | - Lucie Barateau
- National Reference Network for Narcolepsy, Department of Neurology, Guy de Chauliac Hospital; Montpellier University Hospital Center
- Inserm, U1061, Montpellier; Université Montpellier; France
| | | | - Thierry Cens
- IBMM CNRS UMR 5247, Université Montpellier; France
| | | | | |
Collapse
|
19
|
Collet C, Kadala A, Vaissière B, Rousset M, Cens T, Le Conte Y, Chahine M, Thibaud JB, Charnet P. Differential Action of Pyrethroids on Honey Bee and Bumble Bee Voltage-Gated Sodium Channels. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
20
|
Gosselin-Badaroudine P, Moreau A, Simard L, Cens T, Rousset M, Charnet P, Chahine M. Biophysical Characterization of the Honeybee's DSC1 Ortholog Highlights a New Voltage Dependant Calcium Channel Subfamily. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
21
|
Canavese F, Samba A, Rousset M. Pathological fractures in children: Diagnosis and treatment options. Orthop Traumatol Surg Res 2016; 102:S149-59. [PMID: 26774903 DOI: 10.1016/j.otsr.2015.05.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 05/12/2015] [Accepted: 05/20/2015] [Indexed: 02/02/2023]
Abstract
A fracture is defined as pathological when it arises in a bone tissue that has been modified and reshaped by a local or systemic pathological process. In children, pathological fractures can be secondary to several conditions, ranging from metabolic diseases to tumors, infections or neuromuscular pathologies. History, clinical examination and radiologic assessment are essential to making a diagnosis, to identifying the underlying cause and to planning the right treatment of a pathological fracture. Treatment must be tailored to both the fracture and the underlying cause. The objective of this work is to present the diagnostic approach and the course to follow when a child presents with a pathological fracture. The most common causes of pathological fractures, as well as their characteristics, will be described. Pathological fractures occurring in osteogenesis imperfecta and in abused children as well as stress fractures will not be discussed.
Collapse
Affiliation(s)
- F Canavese
- CHU Estaing, université d'Auvergne, service de chirurgie infantile, 1, place Lucie-et-Raymond-Aubrac, 63003 Clermont-Ferrand, France.
| | - A Samba
- CHU Estaing, université d'Auvergne, service de chirurgie infantile, 1, place Lucie-et-Raymond-Aubrac, 63003 Clermont-Ferrand, France
| | - M Rousset
- CHU Estaing, université d'Auvergne, service de chirurgie infantile, 1, place Lucie-et-Raymond-Aubrac, 63003 Clermont-Ferrand, France
| |
Collapse
|
22
|
Charnet P, Cens T, Rousset M, Restituito S, Menard C, Thibaud JB. Voltage-gated calcium channels: Structure, permeability and inactivation properties. BIO Web of Conferences 2016. [DOI: 10.1051/bioconf/20160601001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
23
|
Guttmann CR, Rousset M, Roch JA, Hannoun S, Durand-Dubief F, Belaroussi B, Cavallari M, Rabilloud M, Sappey-Marinier D, Vukusic S, Cotton F. Multiple sclerosis lesion formation and early evolution revisited: A weekly high-resolution magnetic resonance imaging study. Mult Scler 2015; 22:761-9. [PMID: 26362901 DOI: 10.1177/1352458515600247] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 07/13/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND Several magnetic resonance imaging (MRI) studies investigated the evolution of multiple sclerosis (MS) lesions to understand the pathophysiological mechanisms leading to blood-brain barrier breakdown and lesion formation. Only a few assessed the early natural history of MS lesions using short-interval longitudinal MRI. OBJECTIVE The purpose of this study was to characterize MS lesion occurrence and early evolution on high-resolution MRI acquired at weekly intervals. METHODS Active lesions were characterized on 3D fluid attenuation inversion recovery (FLAIR) and gadolinium-enhanced 3D T1-weighted MRI performed weekly (seven weeks) on five untreated patients with relapsing-remitting MS (RRMS). RESULTS Active lesions (n=212) were detected in all patients. All showed contrast-enhancement on at least one time-point. Most new lesions (83.5%) were visible on FLAIR and post-contrast T1-weighted images at first detection; 11.2% showed activity on FLAIR images, one or more weeks before the appearance of contrast-enhancement; 12.5% enhanced before being apparent on FLAIR. CONCLUSION Blood brain barrier disruption is a constant step in the natural history of active MS lesions, but does not always constitute the initial event. These findings are consistent with the existence of a subpopulation of lesions with an 'inside-out' genesis, where neurodegenerative processes might precede microglial activation, and a subsequent adaptive immune response.
Collapse
Affiliation(s)
| | | | - Jean A Roch
- Service de Radiologie, Centre Hospitalier Lyon-Sud, France/CREATIS, Université de Lyon, France
| | | | | | | | | | | | | | | | - François Cotton
- Service de Radiologie, Centre Hospitalier Lyon-Sud, France/CREATIS, Université de Lyon, France
| |
Collapse
|
24
|
Rousset M, Cens T, Menard C, Bowerman M, Bellis M, Brusés J, Raoul C, Scamps F, Charnet P. Regulation of neuronal high-voltage activated Ca(V)2 Ca(2+) channels by the small GTPase RhoA. Neuropharmacology 2015; 97:201-9. [PMID: 26044639 DOI: 10.1016/j.neuropharm.2015.05.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 05/12/2015] [Accepted: 05/16/2015] [Indexed: 11/29/2022]
Abstract
High-Voltage-Activated (HVA) Ca(2+) channels are known regulators of synapse formation and transmission and play fundamental roles in neuronal pathophysiology. Small GTPases of Rho and RGK families, via their action on both cytoskeleton and Ca(2+) channels are key molecules for these processes. While the effects of RGK GTPases on neuronal HVA Ca(2+) channels have been widely studied, the effects of RhoA on the HVA channels remains however elusive. Using heterologous expression in Xenopus laevis oocytes, we show that RhoA activity reduces Ba(2+) currents through CaV2.1, CaV2.2 and CaV2.3 Ca(2+) channels independently of CaVβ subunit. This inhibition occurs independently of RGKs activity and without modification of biophysical properties and global level of expression of the channel subunit. Instead, we observed a marked decrease in the number of active channels at the plasma membrane. Pharmacological and expression studies suggest that channel expression at the plasma membrane is impaired via a ROCK-sensitive pathway. Expression of constitutively active RhoA in primary culture of spinal motoneurons also drastically reduced HVA Ca(2+) current amplitude. Altogether our data revealed that HVA Ca(2+) channels regulation by RhoA might govern synaptic transmission during development and potentially contribute to pathophysiological processes when axon regeneration and growth cone kinetics are impaired.
Collapse
Affiliation(s)
- Matthieu Rousset
- IBMM, CNRS UMR 5247, Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
| | - Thierry Cens
- IBMM, CNRS UMR 5247, Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
| | - Claudine Menard
- IBMM, CNRS UMR 5247, Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
| | - Melissa Bowerman
- Institut des Neurosciences, INSERM U1051, 80 rue Augustin Fliche, 34091 Montpellier, France
| | - Michel Bellis
- IBMM, CNRS UMR 5247, Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
| | - Juan Brusés
- Department of Natural Sciences, Mercy College, Dobbs Ferry, NY 10522, USA; Institute for Cell Biology and Neuroscience (CONICET-UBA), Buenos Aires, Argentina
| | - Cedric Raoul
- Institut des Neurosciences, INSERM U1051, 80 rue Augustin Fliche, 34091 Montpellier, France
| | - Frédérique Scamps
- Institut des Neurosciences, INSERM U1051, 80 rue Augustin Fliche, 34091 Montpellier, France
| | - Pierre Charnet
- IBMM, CNRS UMR 5247, Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France.
| |
Collapse
|
25
|
Oury FX, Lasme P, Michelet C, Rousset M, Abecassis J, Lullien-Pellerin V. Relationships between wheat grain physical characteristics studied through near-isogenic lines with distinct puroindoline-b allele. Theor Appl Genet 2015; 128:913-929. [PMID: 25716819 DOI: 10.1007/s00122-015-2479-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 02/09/2015] [Indexed: 06/04/2023]
Abstract
Genetic (different forms of puroindoline-b) and environment (through variations in vitreousness), have important effects on wheat grain mechanical properties. The two methods of hardness measurements (NIRS, SKCS) do not give the same information. Bread wheat near-isogenic lines differing in hardness, due to distinct puroindoline-b alleles (the wild type, Pinb-D1a, or the mutated forms, Pinb-D1b or Pinb-D1d), were grown for three years in seven sites and under two nitrogen fertilization levels, to study genetic and environmental effects on grain mechanical properties. Two methods, Near-Infrared Reflectance Spectroscopy (NIRS) and Single Kernel Characterization System (SKCS), currently used for grain hardness characterization, were carried out. Grain vitreousness, which is known to affect the grain mechanical behavior but is generally not studied, was also measured, as well as three other characters (Thousand Grain Weight, Test Weight and protein content). The relationships between the different characters were studied. Results revealed a clear effect of the different Pinb-D1 alleles on NIRS hardness, and a marked impact of the environmental conditions on vitreousness. SKCS hardness was influenced by both Pinb-D1 alleles and environmental conditions. The relationship between SKCS and NIRS hardness was strong when considering together soft and hard genotypes, but moderate within a class of genetical hardness. Vitreousness had only a weak effect on NIRS hardness, whereas vitreousness and SKCS values were strongly correlated, with two distinct regressions for soft and hard genotypes. Vitreousness was positively related to protein content, especially in the case of hard genotypes, which were able to reach high vitreousness values never observed for soft genotypes.
Collapse
Affiliation(s)
- François-Xavier Oury
- INRA, UMR 1095 Génétique Diversité et Ecophysiologie des Céréales, 234 avenue du Brézet, 63100, Clermont-Ferrand, France,
| | | | | | | | | | | |
Collapse
|
26
|
Rousset M, Chevalier G, Rousset JP, Robine-Leon S, Dussaulx E, Zweibaum A. Kinetics of glycogen levels in asynchronous and synchronous cultures of a human colon carcinoma cell line, HT 29. Front Gastrointest Res 2015; 4:73-9. [PMID: 428897 DOI: 10.1159/000402287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
27
|
Rousset M, Robine-Leon S, Dussaulx E, Chevalier G, Zweibaum A. Glycogen storage in foetal and malignant epithelial cells of the human colon. Front Gastrointest Res 2015; 4:80-5. [PMID: 428898 DOI: 10.1159/000402288] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
28
|
Cens T, Rousset M, Collet C, Charreton M, Garnery L, Le Conte Y, Chahine M, Sandoz JC, Charnet P. Molecular characterization and functional expression of the Apis mellifera voltage-dependent Ca2+ channels. Insect Biochem Mol Biol 2015; 58:12-27. [PMID: 25602183 DOI: 10.1016/j.ibmb.2015.01.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 01/09/2015] [Accepted: 01/09/2015] [Indexed: 06/04/2023]
Abstract
Voltage-gated Ca(2+) channels allow the influx of Ca(2+) ions from the extracellular space upon membrane depolarization and thus serve as a transducer between membrane potential and cellular events initiated by Ca(2+) transients. Most insects are predicted to possess three genes encoding Cavα, the main subunit of Ca(2+) channels, and several genes encoding the two auxiliary subunits, Cavβ and Cavα2δ; however very few of these genes have been cloned so far. Here, we cloned three full-length cDNAs encoding the three Cavα subunits (AmelCav1a, AmelCav2a and AmelCav3a), a cDNA encoding a novel variant of the Cavβ subunit (AmelCavβc), and three full-length cDNAs encoding three Cavα2δ subunits (AmelCavα2δ1 to 3) of the honeybee Apis mellifera. We identified several alternative or mutually exclusive exons in the sequence of the AmelCav2 and AmelCav3 genes. Moreover, we detected a stretch of glutamine residues in the C-terminus of the AmelCav1 subunit that is reminiscent of the motif found in the human Cav2.1 subunit of patients with Spinocerebellar Ataxia type 6. All these subunits contain structural domains that have been identified as functionally important in their mammalian homologues. For the first time, we could express three insect Cavα subunits in Xenopus oocytes and we show that AmelCav1a, 2a and 3a form Ca(2+) channels with distinctive properties. Notably, the co-expression of AmelCav1a or AmelCav2a with AmelCavβc and AmCavα2δ1 produces High Voltage-Activated Ca(2+) channels. On the other hand, expression of AmelCav3a alone leads to Low Voltage-Activated Ca(2+) channels.
Collapse
Affiliation(s)
- Thierry Cens
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR 5247, Place Eugène Bataillon, 34095 Montpellier cedex 5, France; Centre de Recherche de Biochimie Macromoléculaire (CRBM), CNRS UMR 5237, 1919 Route de Mende, 34293 Montpellier cedex 5, France; Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.
| | - Matthieu Rousset
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR 5247, Place Eugène Bataillon, 34095 Montpellier cedex 5, France; Centre de Recherche de Biochimie Macromoléculaire (CRBM), CNRS UMR 5237, 1919 Route de Mende, 34293 Montpellier cedex 5, France; Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.
| | - Claude Collet
- INRA UR 406 Abeilles et Environnement, 228 Route de l'aérodrome, Domaine Saint Paul, Site Agroparc, CS40509, 84914 Avignon cedex 9, France.
| | - Mercedes Charreton
- INRA UR 406 Abeilles et Environnement, 228 Route de l'aérodrome, Domaine Saint Paul, Site Agroparc, CS40509, 84914 Avignon cedex 9, France.
| | - Lionel Garnery
- Laboratoire Evolution Génome et Spéciation (LEGS), CNRS UPR 9034, Avenue de la Terrasse, Bâtiment 13, 91198 Gif sur Yvette, France.
| | - Yves Le Conte
- INRA UR 406 Abeilles et Environnement, 228 Route de l'aérodrome, Domaine Saint Paul, Site Agroparc, CS40509, 84914 Avignon cedex 9, France.
| | - Mohamed Chahine
- Centre de recherche, Institut universitaire en santé mentale de Québec, 2601 Chemin de la Canardière, Québec Québec G1J 2G3, Canada.
| | - Jean-Christophe Sandoz
- Laboratoire Evolution Génome et Spéciation (LEGS), CNRS UPR 9034, Avenue de la Terrasse, Bâtiment 13, 91198 Gif sur Yvette, France.
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR 5247, Place Eugène Bataillon, 34095 Montpellier cedex 5, France; Centre de Recherche de Biochimie Macromoléculaire (CRBM), CNRS UMR 5237, 1919 Route de Mende, 34293 Montpellier cedex 5, France; Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.
| |
Collapse
|
29
|
Kadala A, Charreton M, Jakob I, Cens T, Rousset M, Chahine M, Le Conte Y, Charnet P, Collet C. Pyrethroids differentially alter voltage-gated sodium channels from the honeybee central olfactory neurons. PLoS One 2014; 9:e112194. [PMID: 25390654 PMCID: PMC4229128 DOI: 10.1371/journal.pone.0112194] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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: 07/16/2014] [Accepted: 10/13/2014] [Indexed: 11/29/2022] Open
Abstract
The sensitivity of neurons from the honey bee olfactory system to pyrethroid insecticides was studied using the patch-clamp technique on central ‘antennal lobe neurons’ (ALNs) in cell culture. In these neurons, the voltage-dependent sodium currents are characterized by negative potential for activation, fast kinetics of activation and inactivation, and the presence of cumulative inactivation during train of depolarizations. Perfusion of pyrethroids on these ALN neurons submitted to repetitive stimulations induced (1) an acceleration of cumulative inactivation, and (2) a marked slowing of the tail current recorded upon repolarization. Cypermethrin and permethrin accelerated cumulative inactivation of the sodium current peak in a similar manner and tetramethrin was even more effective. The slow-down of channel deactivation was markedly dependent on the type of pyrethroid. With cypermethrin, a progressive increase of the tail current amplitude along with successive stimulations reveals a traditionally described use-dependent recruitment of modified sodium channels. However, an unexpected decrease in this tail current was revealed with tetramethrin. If one considers the calculated percentage of modified channels as an index of pyrethroids effects, ALNs are significantly more susceptible to tetramethrin than to permethrin or cypermethrin for a single depolarization, but this difference attenuates with repetitive activity. Further comparison with peripheral neurons from antennae suggest that these modifications are neuron type specific. Modeling the sodium channel as a multi-state channel with fast and slow inactivation allows to underline the effects of pyrethroids on a set of rate constants connecting open and inactivated conformations, and give some insights to their specificity. Altogether, our results revealed a differential sensitivity of central olfactory neurons to pyrethroids that emphasize the ability for these compounds to impair detection and processing of information at several levels of the bees olfactory pathway.
Collapse
Affiliation(s)
- Aklesso Kadala
- INRA, UR 406 Abeilles et Environnement, Toxicologie Environnementale, Avignon, France
| | - Mercedes Charreton
- INRA, UR 406 Abeilles et Environnement, Toxicologie Environnementale, Avignon, France
- UMT Protection des Abeilles dans l'Environnement, Avignon, France
| | - Ingrid Jakob
- INRA, UR 406 Abeilles et Environnement, Toxicologie Environnementale, Avignon, France
| | - Thierry Cens
- CNRS, UMR 5237, Centre de Recherche de Biochimie Macromoléculaire, Université Montpellier 2, Montpellier, France
| | - Matthieu Rousset
- CNRS, UMR 5237, Centre de Recherche de Biochimie Macromoléculaire, Université Montpellier 2, Montpellier, France
| | - Mohamed Chahine
- Department of medicine, Laval University, Québec city, Canada
| | - Yves Le Conte
- INRA, UR 406 Abeilles et Environnement, Toxicologie Environnementale, Avignon, France
- UMT Protection des Abeilles dans l'Environnement, Avignon, France
| | - Pierre Charnet
- CNRS, UMR 5237, Centre de Recherche de Biochimie Macromoléculaire, Université Montpellier 2, Montpellier, France
| | - Claude Collet
- INRA, UR 406 Abeilles et Environnement, Toxicologie Environnementale, Avignon, France
- UMT Protection des Abeilles dans l'Environnement, Avignon, France
- * E-mail:
| |
Collapse
|
30
|
Canavese F, Charles YP, Dimeglio A, Schuller S, Rousset M, Samba A, Pereira B, Steib JP. A comparison of the simplified olecranon and digital methods of assessment of skeletal maturity during the pubertal growth spurt. Bone Joint J 2014; 96-B:1556-60. [DOI: 10.1302/0301-620x.96b11.33995] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Assessment of skeletal age is important in children’s orthopaedics. We compared two simplified methods used in the assessment of skeletal age. Both methods have been described previously with one based on the appearance of the epiphysis at the olecranon and the other on the digital epiphyses. We also investigated the influence of assessor experience on applying these two methods. Our investigation was based on the anteroposterior left hand and lateral elbow radiographs of 44 boys (mean: 14.4; 12.4 to 16.1 ) and 78 girls (mean: 13.0; 11.1 to14.9) obtained during the pubertal growth spurt. A total of nine observers examined the radiographs with the observers assigned to three groups based on their experience (experienced, intermediate and novice). These raters were required to determined skeletal ages twice at six-week intervals. The correlation between the two methods was determined per assessment and per observer groups. Interclass correlation coefficients (ICC) evaluated the reproducibility of the two methods. The overall correlation between the two methods was r = 0.83 for boys and r = 0.84 for girls. The correlation was equal between first and second assessment, and between the observer groups (r ≥ 0.82). There was an equally strong ICC for the assessment effect (ICC ≤ 0.4%) and observer effect (ICC ≤ 3%) for each method. There was no significant (p < 0.05) difference between the levels of experience. The two methods are equally reliable in assessing skeletal maturity. The olecranon method offers detailed information during the pubertal growth spurt, while the digital method is as accurate but less detailed, making it more useful after the pubertal growth spurt once the olecranon has ossified. Cite this article: Bone Joint J 2014;3:1556–60
Collapse
Affiliation(s)
- F. Canavese
- CHU Clermont-Ferrand, Department
of Pediatric Surgery, 1 Place Lucie et Raymond
Aubrac, 63003 Clermont-Ferrand, France
| | - Y. P. Charles
- Hôpitaux Universitaires de Strasbourg, Department
of Spine Surgery, 1 Place de l’hôpital, BP 426, 67091
Strasbourg Cedex, France
| | - A. Dimeglio
- Université de Montpellier, Faculty
of Medicine, 2 Rue de l’école de Médecine, 34060 Montpellier, France
| | - S. Schuller
- Hôpitaux Universitaires de Strasbourg, Department
of Spine Surgery, 1 Place de l’hôpital, BP 426, 67091
Strasbourg Cedex, France
| | - M. Rousset
- CHU Clermont-Ferrand, Department
of Pediatric Surgery, 1 Place Lucie et Raymond
Aubrac, 63003 Clermont-Ferrand, France
| | - A. Samba
- CHU Clermont-Ferrand, Department
of Pediatric Surgery, 1 Place Lucie et Raymond
Aubrac, 63003 Clermont-Ferrand, France
| | - B. Pereira
- CHU Clermont-Ferrand, Biostatistics
Unit (DRCI), 58 Rue Montalembert, 63000
Clermont-Ferrand, France
| | - J-P. Steib
- Hôpitaux Universitaires de Strasbourg, Department
of Spine Surgery, 1 Place de l’hôpital, BP 426, 67091
Strasbourg Cedex, France
| |
Collapse
|
31
|
Catherine Z, Isaac S, Cotton F, Roch J, Rousset M, Bouletreau P, Breton P. [Giant ameloblastoma of the mandible]. ACTA ACUST UNITED AC 2013; 114:97-101. [PMID: 23838249 DOI: 10.1016/j.revsto.2013.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 09/06/2012] [Accepted: 01/04/2013] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Giant ameloblastomas are more common in developing countries. They raise a serious problem of management. We present the case of one of the largest ameloblastoma ever reported. CASE REPORT A 48-year-old Congolese female patient was referred for mandibular swelling having begun 23 years before and now inducing severe functional disorders. A cephalic CT scan revealed a multicystic mass, 30×18×10cm in size, with a typical "soap bubble" presentation, and with thinned and inflated cortical bone. The treatment was sub-total segmental mandibulectomy with immediate reconstruction using a fibular free flap, modeled on the sampling site by four ostectomies. The pathological examination confirmed the diagnosis of a benign follicular and plexiform ameloblastoma. The excess of soft tissue was treated with a right commissuroplasty on the 15th postoperative day. There was no complication. DISCUSSION Radical treatment followed by immediate reconstruction using a free flap is the treatment of choice for giant mandibular ameloblastomas, when considering immediate functional and esthetic benefits. This is a prime concern for patients with a difficult access to health care and for whom long-term follow-up is not feasible.
Collapse
Affiliation(s)
- Z Catherine
- Service de stomatologie, chirurgie maxillo-faciale et chirurgie plastique de la face, centre hospitalier Lyon-Sud, 165 chemin du Grand-Revoyet, Pierre-Bénite, France
| | | | | | | | | | | | | |
Collapse
|
32
|
Canavese F, Rousset M, Girard G. Scoliose et douleurs dorsales. Mythe ou réalité ? Que faire ? L’avis de l’orthopédiste. Arch Pediatr 2013; 20:H1-220. [DOI: 10.1016/s0929-693x(13)71291-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
33
|
Cens T, Rousset M, Collet C, Raymond V, Démares F, Quintavalle A, Bellis M, Le Conte Y, Chahine M, Charnet P. Characterization of the first honeybee Ca²⁺ channel subunit reveals two novel species- and splicing-specific modes of regulation of channel inactivation. Pflugers Arch 2013; 465:985-96. [PMID: 23588376 DOI: 10.1007/s00424-013-1223-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 01/18/2013] [Accepted: 01/21/2013] [Indexed: 10/27/2022]
Abstract
The honeybee is a model system to study learning and memory, and Ca(2+) signals play a key role in these processes. We have cloned, expressed, and characterized the first honeybee Ca(2+) channel subunit. We identified two splice variants of the Apis CaVβ Ca(2+) channel subunit (Am-CaVβ) and demonstrated expression in muscle and neurons. Although AmCaVβ shares with vertebrate CaVβ subunits the SH3 and GK domains, it beholds a unique N terminus that is alternatively spliced in the first exon to produce a long (a) and short (b) variant. When expressed with the CaV2 channels both, AmCaVβa and AmCaVβb, increase current amplitude, shift the voltage-sensitivity of the channel, and slow channel inactivation as the vertebrate CaVβ2a subunit does. However, as opposed to CaVβ2a, slow inactivation induced by Am-CaVβa was insensitive to palmitoylation but displayed a unique PI3K sensitivity. Inactivation produced by the b variant was PI3K-insensitive but staurosporine/H89-sensitive. Deletion of the first exon suppressed the sensitivity to PI3K inhibitors, staurosporine, or H89. Recording of Ba(2+) currents in Apis neurons or muscle cells evidenced a sensitivity to PI3K inhibitors and H89, suggesting that both AmCaVβ variants may be important to couple cell signaling to Ca(2+) entry in vivo. Functional interactions with phospho-inositide and identification of phosphorylation sites in AmCaVβa and AmCaVβb N termini, respectively, suggest that AmCaVβ splicing promoted two novel and alternative modes of regulation of channel activity with specific signaling pathways. This is the first description of a splicing-dependent kinase switch in the regulation of Ca(2+) channel activity by CaVβ subunit.
Collapse
Affiliation(s)
- Thierry Cens
- CRBM, UMR 5237, CNRS, Université de Montpellier I&II, Montpellier, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Tadmouri A, Kiyonaka S, Barbado M, Rousset M, Fablet K, Sawamura S, Bahembera E, Pernet-Gallay K, Arnoult C, Miki T, Sadoul K, Gory-Faure S, Lambrecht C, Lesage F, Akiyama S, Khochbin S, Baulande S, Janssens V, Andrieux A, Dolmetsch R, Ronjat M, Mori Y, De Waard M. Cacnb4 directly couples electrical activity to gene expression, a process defective in juvenile epilepsy. EMBO J 2012; 31:3730-44. [PMID: 22892567 DOI: 10.1038/emboj.2012.226] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 07/17/2012] [Indexed: 12/11/2022] Open
Abstract
Calcium current through voltage-gated calcium channels (VGCC) controls gene expression. Here, we describe a novel signalling pathway in which the VGCC Cacnb4 subunit directly couples neuronal excitability to transcription. Electrical activity induces Cacnb4 association to Ppp2r5d, a regulatory subunit of PP2A phosphatase, followed by (i) nuclear translocation of Cacnb4/Ppp2r5d/PP2A, (ii) association with the tyrosine hydroxylase (TH) gene promoter through the nuclear transcription factor thyroid hormone receptor alpha (TRα), and (iii) histone binding through association of Cacnb4 with HP1γ concomitantly with Ser(10) histone H3 dephosphorylation by PP2A. This signalling cascade leads to TH gene repression by Cacnb4 and is controlled by the state of interaction between the SH3 and guanylate kinase (GK) modules of Cacnb4. The human R482X CACNB4 mutation, responsible for a form of juvenile myoclonic epilepsy, prevents association with Ppp2r5 and nuclear targeting of the complex by altering Cacnb4 conformation. These findings demonstrate that an intact VGCC subunit acts as a repressor recruiting platform to control neuronal gene expression.
Collapse
Affiliation(s)
- Abir Tadmouri
- Unité Inserm U, Grenoble Institute of Neuroscience, Université Joseph Fourier, La Tronche, France
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Le Gouis J, Bordes J, Ravel C, Heumez E, Faure S, Praud S, Galic N, Remoué C, Balfourier F, Allard V, Rousset M. Genome-wide association analysis to identify chromosomal regions determining components of earliness in wheat. Theor Appl Genet 2012; 124:597-611. [PMID: 22065067 DOI: 10.1007/s00122-011-1732-3] [Citation(s) in RCA: 28] [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] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 10/14/2011] [Indexed: 05/18/2023]
Abstract
The modification of flowering date is considered an important way to escape the current or future climatic constraints that affect wheat crops. A better understanding of its genetic bases would enable a more efficient and rapid modification through breeding. The objective of this study was to identify chromosomal regions associated with earliness in wheat. A 227-wheat core collection chosen to be highly contrasted for earliness was characterized for heading date. Experiments were conducted in controlled conditions and in the field for 3 years to break down earliness in the component traits: photoperiod sensitivity, vernalization requirement and narrow-sense earliness. Whole-genome association mapping was carried out using 760 molecular markers and taking into account the five ancestral group structure. We identified 62 markers individually associated to earliness components corresponding to 33 chromosomal regions. In addition, we identified 15 other significant markers and seven more regions by testing marker pair interactions. Co-localizations were observed with the Ppd-1, Vrn-1 and Rht-1 candidate genes. Using an independent set of lines to validate the model built for heading date, we were able to explain 34% of the variation using the structure and the significant markers. Results were compared with already published data using bi-parental populations giving an insight into the genetic architecture of flowering time in wheat.
Collapse
Affiliation(s)
- J Le Gouis
- INRA, UMR 1095 Génétique, Diversité et Ecophysiologie des Céréales, 234 Avenue du Brézet, 63 100, Clermont-Ferrand, France.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Gillard L, Benkouhi A, Gandhour F, Larroque B, Rousset M, Lacorte JM, Le Beyec J, Joly F. O11 Augmentation de la sécrétion à jeun et postprandiale des entéropeptides GLP-2, GLP-1 et PYY chez des patients avec syndrome de grêle court avec colon en continuité comparés à des sujets contrôles. NUTR CLIN METAB 2011. [DOI: 10.1016/s0985-0562(11)70015-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
37
|
Frochot V, Alqub M, Cattin AL, Carrière V, Houiller A, Barbot L, Saint-Just S, Ribeiro-Pillet A, Cardot P, Chambaz J, Rousset M, Lacorte JM. 443 THE TRANSCRIPTION FACTOR HNF-4α: A KEY ACTOR OF THE INTESTINAL UPTAKE OF FATTY ACIDS IN MOUSE. ATHEROSCLEROSIS SUPP 2011. [DOI: 10.1016/s1567-5688(11)70444-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
38
|
Abstract
Voltage-gated Ca(2+) channels (VGCCs) play a key role in neuronal signaling but can also contribute to cellular dysfunction and death under pathological conditions such as stroke and neurodegenerative diseases. We report that activation of N-methyl-D-aspartic acid receptors causes internalization and degradation of Ca(V)1.2 channels, resulting in decreased Ca(2+) entry and reduced toxicity. Ca(V)1.2 internalization and degradation requires binding to phosphatidylinositol 3-phosphate 5-kinase (PIKfyve), a lipid kinase which generates phosphatidylinositol (3,5)-bisphosphate (PtdIns(3,5)P(2)) and regulates endosome and lysosome function. Sustained activation of glutamate receptors recruits PIKfyve to Ca(V)1.2 channels, increases cellular levels of PtdIns(3,5)P(2), and promotes targeting of Ca(V)1.2 to lysosomes. Knockdown of PIKfyve prevents Ca(V)1.2 degradation and increases neuronal susceptibility to excitotoxicity. These experiments identify a novel mechanism by which neurons are protected from excitotoxicity and provide a possible explanation for neuronal death in diseases caused by mutations that affect PtdIns(3,5)P(2) regulation.
Collapse
Affiliation(s)
- Fuminori Tsuruta
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | | | | | | |
Collapse
|
39
|
Leyris JP, Gondeau C, Charnet A, Delattre C, Rousset M, Cens T, Charnet P. RGK GTPase-dependent CaV2.1 Ca2+ channel inhibition is independent of CaVbeta-subunit-induced current potentiation. FASEB J 2009; 23:2627-38. [PMID: 19332647 DOI: 10.1096/fj.08-122135] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
RGK (Rad-Gem-Rem) GTPases have been described as potent negative regulators of the Ca(2+) influx via high-threshold voltage-activated Ca(2+) channels. Recent work, mostly performed on Ca(V)1.2 Ca(2+) channels, has highlighted the crucial role played by the channel auxiliary Ca(V)beta subunits and identified several GTPase and beta-subunit protein domains involved in this regulation. We now extend these conclusions by producing the first complete characterization of the effects of Gem, Rem, and Rem2 on the neuronal Ca(V)2.1 Ca(2+) channels expressed with Ca(V)beta(1) or Ca(V)beta(2) subunits. Current inhibition is limited to a decrease in amplitude with no modification in the voltage dependence or kinetics of the current. We demonstrate that this inhibition can occur for Ca(V)beta constructs with impaired capacity to induce current potentiation, but that it is lost for Ca(V)beta constructs deleted for their beta-interaction domain. The RGK C-terminal last approximately 80 amino acids are sufficient to allow potent current inhibition and in vivo beta-subunit/Gem interaction. Interestingly, although Gem and Gem carboxy-terminus induce a completely different pattern of beta-subunit cellular localization, they both potently inhibit Ca(V)2.1 channels. These data therefore set the status of neuronal Ca(V)2.1 Ca(2+) channel inhibition by RGK GTPases, emphasizing the role of short amino acid sequences of both proteins in beta-subunit binding and channel inhibition and revealing a new mechanism for channel inhibition.
Collapse
Affiliation(s)
- J-P Leyris
- CRBM, CNRS UMR 5237, Université de Montpellier 1, 34293 Montpellier cedex, France
| | | | | | | | | | | | | |
Collapse
|
40
|
|
41
|
Mikheenko IP, Rousset M, Dementin S, Macaskie LE. Bioaccumulation of palladium by Desulfovibrio fructosivorans wild-type and hydrogenase-deficient strains. Appl Environ Microbiol 2008; 74:6144-6. [PMID: 18689514 PMCID: PMC2565964 DOI: 10.1128/aem.02538-07] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2007] [Accepted: 08/01/2008] [Indexed: 11/20/2022] Open
Abstract
Wild-type Desulfovibrio fructosivorans and three hydrogenase-negative mutants reduced Pd(II) to Pd(0). The location of Pd(0) nanoparticles on the cytoplasmic membrane of the mutant retaining only cytoplasmic membrane-bound hydrogenase was strong evidence for the role of hydrogenases in Pd(0) deposition. Hydrogenase activity was retained at acidic pH, shown previously to favor Pd(0) deposition.
Collapse
Affiliation(s)
- I P Mikheenko
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, England, United Kingdom
| | | | | | | |
Collapse
|
42
|
Abstract
Voltage-gated Ca2+ channels (VGCC) play a key role in many physiological functions by their high selectivity for Ca2+ over other divalent and monovalent cations in physiological situations. Divalent/monovalent selection is shared by all VGCC and is satisfactorily explained by the existence, within the pore, of a set of four conserved glutamate/aspartate residues (EEEE locus) coordinating Ca2+ ions. This locus however does not explain either the choice of Ca2+ among other divalent cations or the specific conductances encountered in the different VGCC. Our systematic analysis of high- and low-threshold VGCC currents in the presence of Ca2+ and Ba2+ reveals highly specific selectivity profiles. Sequence analysis, molecular modeling, and mutational studies identify a set of nonconserved charged residues responsible for these profiles. In HVA (high voltage activated) channels, mutations of this set modify divalent cation selectivity and channel conductance without change in divalent/monovalent selection, activation, inactivation, and kinetics properties. The CaV2.1 selectivity profile is transferred to CaV2.3 when exchanging their residues at this location. Numerical simulations suggest modification in an external Ca2+ binding site in the channel pore directly involved in the choice of Ca2+, among other divalent physiological cations, as the main permeant cation for VGCC. In LVA (low voltage activated) channels, this locus (called DCS for divalent cation selectivity) also influences divalent cation selection, but our results suggest the existence of additional determinants to fully recapitulate all the differences encountered among LVA channels. These data therefore attribute to the DCS a unique role in the specific shaping of the Ca2+ influx between the different HVA channels.
Collapse
Affiliation(s)
- Thierry Cens
- Centre de Recherche de Biochimie Macromoléculaire, UMR 5237 Centre National de la Recherche Scientifique, 34293 Montpellier, France
| | | | | | | |
Collapse
|
43
|
Greffeuille V, Mabille F, Rousset M, Oury FX, Abecassis J, Lullien-Pellerin V. Mechanical properties of outer layers from near-isogenic lines of common wheat differing in hardness. J Cereal Sci 2007. [DOI: 10.1016/j.jcs.2006.09.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
44
|
Greffeuille V, Abecassis J, Rousset M, Oury FX, Faye A, L'Helgouac'h CB, Lullien-Pellerin V. Grain characterization and milling behaviour of near-isogenic lines differing by hardness. Theor Appl Genet 2006; 114:1-12. [PMID: 17006691 DOI: 10.1007/s00122-006-0403-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2006] [Accepted: 08/22/2006] [Indexed: 05/12/2023]
Abstract
Wheat grain hardness is a major factor affecting the milling behaviour and end-product quality although its exact structural and biochemical basis is still not understood. This study describes the development of new near-isogenic lines selected on hardness. Hard and soft sister lines were characterised by near infrared reflectance (NIR) and particle size index (PSI) hardness index, grain protein content, thousand kernel weight and vitreousness. The milling behaviour of these wheat lines was evaluated on an instrumented micromill which also measures the grinding energy and flour particle size distribution was investigated by laser diffraction. Endosperm mechanical properties were measured using compression tests. Results pointed out the respective effect of hardness and vitreousness on those characteristics. Hardness was shown to influence both the mode of fracture and the mechanical properties of the whole grain and endosperm. Thus, this parameter also acts on milling behaviour. On the other hand, vitreousness was found to mainly play a role on the energy required to break the grain. This study allows us to distinguish between consequences of hardness and vitreousness. Hardness is suggested to influence the adhesion forces between starch granules and protein matrix whereas vitreousness would rather be related to the endosperm microstructure.
Collapse
Affiliation(s)
- V Greffeuille
- UMR Ingénierie des Agropolymères et Technologies Emergentes, INRA-ENSAM, 2 Place Viala, 34060, Montpellier Cedex 01, France
| | | | | | | | | | | | | |
Collapse
|
45
|
Cens T, Rousset M, Leyris JP, Fesquet P, Charnet P. Voltage- and calcium-dependent inactivation in high voltage-gated Ca2+ channels. Progress in Biophysics and Molecular Biology 2006; 90:104-17. [PMID: 16038964 DOI: 10.1016/j.pbiomolbio.2005.05.013] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Calcium influx into cardiac myocytes via voltage-gated Ca channels is a key step in initiating the contractile response. During prolonged depolarizations, toxic Ca(2+) overload is prevented by channel inactivation occurring through two different processes identified by their primary trigger: voltage or intracellular Ca(2+). In physiological situations, cardiac L-type (Ca(V)1.2) Ca(2+) channels inactivate primarily via Ca(2+)-dependent inactivation (CDI), while neuronal P/Q (Ca(V)2.1) Ca(2+) channels use preferentially voltage-dependent inactivation (VDI). In certain situations however, these two types of channels have been shown to be able to inactivate by both processes. From a structural view point, the rearrangement occurring during CDI and VDI is not precisely known, but functional studies have underlined the role played by at least 2 channel sequences: a C-terminal binding site for the Ca(2+) sensor calmodulin, essential for CDI, and the loop connecting domains I and II, essential for VDI. The conserved regulation of VDI and CDI by the auxiliary channel beta subunit strongly suggests that these two mechanisms may use a set of common protein-protein interactions that are influenced by the auxiliary subunit. We will review our current knowledge of these interactions. New data are presented on L-P/Q (Ca(V)1.2/Ca(V)2.1) channel chimera that confirm the role of the I-II loop in VDI and CDI, and reveal some of the essential steps in Ca(2+) channel inactivation.
Collapse
Affiliation(s)
- T Cens
- CNRS CRBM FRE 2593, 1919 Route de Mende, 34293 Montpellier, France
| | | | | | | | | |
Collapse
|
46
|
Abstract
New functions for voltage-gated Ca(2+) channel auxiliary beta subunits have recently been identified. These functions appear to be regulated by the beta subunit alone, independently of any effects on the Ca(2+) influx; hence, the beta subunit may not be truly "auxiliary" and may play more fundamental roles in Ca(2+) homeostasis or gene regulation. These new findings raise important questions and open new, exciting research avenues.
Collapse
Affiliation(s)
- Matthieu Rousset
- Neurobiologie Moléculaire, CRBM FRE 2593, CNRS, 1919 Route de Mende, 34293 Montpellier Cedex, France
| | | | | |
Collapse
|
47
|
Abstract
Voltage-gated calcium channels are key players in a number of fundamental physiological functions including contraction, secretion, transmitter release or gene activation. They allow a flux of calcium into the cell that constitutes a switch-on signal for most of these functions. The structures responsible for the shaping of these fluxes by the membrane voltage belong to the channel itself, but a number of associated proteins are known to more precisely tune this calcium entry and adapt it to the cellular demand. The calcium channel regulatory beta subunit is undoubtedly the most important one, being influent on the expression, the kinetics, the voltage-dependence of channel opening and closing and on the pharmacology of the channel. Heterologous expression, combined to mutagenesis and electrophysiological and biochemical experiments have revealed the roles of short sequences of the beta subunit, including the BID (beta-interaction domain), in the physical and functional interactions with the channel pore. The resolved crystal structure of the beta subunit now sheds new light on these sequences and their interactions with the rest of the protein. The presence of a type 3 src-homology (SH3) domain and a guanylate kinase (GK) domain confirms that the subunit belongs to the MAGUK protein family. Consistently, the polyproline binding site and the kinase function of the SH3 and the GK domains, respectively, are non functional, and the BID appears to be buried in the structure, preserving the SH3-GK interaction but not directly available for interactions with the channel pore subunit. Anchoring of the beta subunit to the channel occurs via a hydrophobic grove in the GK domain, leaving a large surface of the subunit open to other protein-protein interactions. To what extent the intramolecular SH3-GK interaction is necessary for the stabilisation of this grove in a functional unit remains to be understood. The beta subunit may thus play a key role in scaffolding multiple proteins around the channel and organizing diverse calcium-dependent signalling pathways directly linked to voltage-gated calcium entry. These findings will undoubtedly vitalize the search for new beta-specific partners and functions.
Collapse
Affiliation(s)
- Matthieu Rousset
- Equipe de Neurobiologie moléculaire, Centre de Recherche de Biochimie macromoléculaire, CNRS FRE 2593, 1919, route de Mende, 34293 Montpellier, France
| | | | | |
Collapse
|
48
|
Hanocq E, Niarquin M, Heumez E, Rousset M, Le Gouis J. Detection and mapping of QTL for earliness components in a bread wheat recombinant inbred lines population. Theor Appl Genet 2004; 110:106-15. [PMID: 15551039 DOI: 10.1007/s00122-004-1799-1] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2003] [Accepted: 08/12/2004] [Indexed: 05/02/2023]
Abstract
Earliness, an adaptative trait and factor of variation for agronomic characters, is a major trait in plant breeding. Its constituent traits, photoperiod sensitivity (PS), vernalization requirement (VR) and intrinsic earliness (IE), are largely under independent genetic controls. Mapping of major genes and quantitative trait loci (QTL) controlling these components is in progress. Most of the studies focusing on earliness considered it as a whole or through one (or two) of its components. The purpose of this study was to detect and map QTL for the three traits together through an experimental design combining field trials and controlled growth conditions. QTL were mapped in a population of F(7) recombinant inbred lines derived by single-seed descent from a cross between two French varieties, 'Renan' and 'Recital'. A map was previously constructed, based on 194 lines and 254 markers, covering about 77% of the genome. Globally, 13 QTL with a LOD>2.5 were detected, of which four control PS, five control VR and four control IE. Two major photoperiod sensitive QTL, together explaining more than 31% of the phenotypic variation, were mapped on chromosomes 2B and 2D, at the same position as the two major genes Ppd-B1 and Ppd-D1. One major VR QTL explaining (depending on the year) 21.8-39.6% of the phenotypic variation was mapped on 5A. Among the other QTL, two QTL of PS and VR not referenced so far were detected on 5A and 6D, respectively. A VR QTL already detected on 2B in a connected population was confirmed.
Collapse
Affiliation(s)
- E Hanocq
- Institut National de la Recherche Agronomique (INRA), Unité de Génétique et Amélioration des Plantes, B.P. 50136, 80203 Péronne Cedex, France.
| | | | | | | | | |
Collapse
|
49
|
Abstract
Starting from a comparative study of different Ca2+ chelators on the G-protein-induced inhibition of the CaV2.1 Ca channels, we demonstrate that BAPTA and DM-nitrophen are able to interact, in a Ca2+- and lipid-dependent manner, with phospholipid monolayers. Critical insertion pressure and sensitivity to charged lipids indicated that insertion in the lipid film may occur in biological membranes as those found on Xenopus oocytes. This novel property is not found for EGTA and EDTA and may participate to the unusual ability of BAPTA-related molecules to chelate Ca2+ ions in the very close vicinity of the plasma membrane, where most of the Ca2+-dependent signalling triggered by voltage-gated Ca2+ currents occurs.
Collapse
Affiliation(s)
- M Rousset
- CRBM, CNRS FRE2593, 1919 Route de Mende, 34293 Montpellier, France
| | | | | | | |
Collapse
|
50
|
Rousset M, Cens T, Gouin-Charnet A, Scamps F, Charnet P. Ca2+ and phosphatidylinositol 4,5-bisphosphate stabilize a Gbeta gamma-sensitive state of Ca V2 Ca 2+ channels. J Biol Chem 2004; 279:14619-30. [PMID: 14722074 DOI: 10.1074/jbc.m313284200] [Citation(s) in RCA: 23] [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: 11/06/2022] Open
Abstract
Direct interactions between G-protein betagamma subunits and N- or P/Q-type Ca(2+) channels mediate the inhibitory action of several neurotransmitters in the brain. Membrane potential, channel phosphorylation, or auxiliary subunit association tightly regulate these interactions and the consequent inhibition of Ca(2+) current. We now provide evidence that intracellular Ca(2+) concentration and phosphoinositides play a stabilizing role in this direct voltage-dependent inhibition. Lowering resting cytosolic Ca(2+) concentration in Xenopus oocytes expressing Ca(V)2Ca(2+) channels strongly decreased basal as well as phasic, agonist-dependent inhibition of Ca(2+) channels by G-proteins. Decreasing phosphoinositide levels also suppressed G-protein inhibition and completely occluded the effects of a subsequent injection of Ca(2+) chelator. Similar regulations are observed in mouse dorsal root ganglia neurons. Alteration of G-protein block by these agents is independent of protein phosphorylation, cytoskeleton dynamics, and GTPase or GDP/GTP exchange activity, suggesting a direct action at the level of the Ca(2+) channel/Gbetagamma-protein interaction. Moreover, affinity binding experiments of intracellular loops of the Ca(V)2.1 Ca(2+) channels to different phospholipids revealed specific interactions between the C-terminal tail of the channel and phosphoinositides. Taken together these data indicate that a Ca(2+)-sensitive interaction of the C-terminal tail of P/Q channels with the plasma membrane is important for G-protein regulation.
Collapse
Affiliation(s)
- Matthieu Rousset
- Centre de Recherche de Biochimie Macromoléculaire, CNRS-FRE 2593, 1919 Route de Mende, 34293 Montpellier, France
| | | | | | | | | |
Collapse
|