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Le Dréan ME, Le Berre-Scoul C, Paillé V, Caillaud M, Oullier T, Gonzales J, Hulin P, Neunlist M, Talon S, Boudin H. The regulation of enteric neuron connectivity by semaphorin 5A is affected by the autism-associated S956G missense mutation. iScience 2024; 27:109638. [PMID: 38650986 PMCID: PMC11033180 DOI: 10.1016/j.isci.2024.109638] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 02/29/2024] [Accepted: 03/26/2024] [Indexed: 04/25/2024] Open
Abstract
The neural network of the enteric nervous system (ENS) underlies gastrointestinal functions. However, the molecular mechanisms involved in enteric neuronal connectivity are poorly characterized. Here, we studied the role of semaphorin 5A (Sema5A), previously characterized in the central nervous system, on ENS neuronal connectivity. Sema5A is linked to autism spectrum disorder (ASD), a neurodevelopmental disorder frequently associated with gastrointestinal comorbidities, and potentially associated with ENS impairments. This study investigated in rat enteric neuron cultures and gut explants the role of Sema5A on enteric neuron connectivity and the impact of ASD-associated mutations on Sema5A activity. Our findings demonstrated that Sema5A promoted axonal complexity and reduced functional connectivity in enteric neurons. Strikingly, the ASD-associated mutation S956G in Sema5A strongly affected these activities. This study identifies a critical role of Sema5A in the ENS as a regulator of neuronal connectivity that might be compromised in ASD.
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Affiliation(s)
- Morgane E. Le Dréan
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Catherine Le Berre-Scoul
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Vincent Paillé
- Nantes Université, INRAE, UMR 1280, PhAN, IMAD, 44000 Nantes, France
| | - Martial Caillaud
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Thibauld Oullier
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Jacques Gonzales
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Philippe Hulin
- Plateforme MicroPICell Nantes Université, CHU Nantes, CNRS, INSERM, BioCore, US16, SFR Bonamy, Nantes, France
| | - Michel Neunlist
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Sophie Talon
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Hélène Boudin
- Nantes Université, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
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Caillaud M, Le Dréan ME, De-Guilhem-de-Lataillade A, Le Berre-Scoul C, Montnach J, Nedellec S, Loussouarn G, Paillé V, Neunlist M, Boudin H. A functional network of highly pure enteric neurons in a dish. Front Neurosci 2023; 16:1062253. [PMID: 36685225 PMCID: PMC9853279 DOI: 10.3389/fnins.2022.1062253] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/02/2022] [Indexed: 01/09/2023] Open
Abstract
The enteric nervous system (ENS) is the intrinsic nervous system that innervates the entire digestive tract and regulates major digestive functions. Recent evidence has shown that functions of the ENS critically rely on enteric neuronal connectivity; however, experimental models to decipher the underlying mechanisms are limited. Compared to the central nervous system, for which pure neuronal cultures have been developed for decades and are recognized as a reference in the field of neuroscience, an equivalent model for enteric neurons is lacking. In this study, we developed a novel model of highly pure rat embryonic enteric neurons with dense and functional synaptic networks. The methodology is simple and relatively fast. We characterized enteric neurons using immunohistochemical, morphological, and electrophysiological approaches. In particular, we demonstrated the applicability of this culture model to multi-electrode array technology as a new approach for monitoring enteric neuronal network activity. This in vitro model of highly pure enteric neurons represents a valuable new tool for better understanding the mechanisms involved in the establishment and maintenance of enteric neuron synaptic connectivity and functional networks.
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Affiliation(s)
- Martial Caillaud
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France,*Correspondence: Martial Caillaud,
| | - Morgane E. Le Dréan
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | | | - Catherine Le Berre-Scoul
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Jérôme Montnach
- Nantes Université, CNRS, INSERM, L’institut du Thorax, Nantes, France
| | - Steven Nedellec
- Nantes Université, CHU Nantes, CNRS, INSERM, BioCore, US16, SFR Bonamy, Nantes, France
| | - Gildas Loussouarn
- Nantes Université, CNRS, INSERM, L’institut du Thorax, Nantes, France
| | - Vincent Paillé
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, Nantes, France
| | - Michel Neunlist
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Hélène Boudin
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
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Bodin R, Paillé V, Oullier T, Durand T, Aubert P, Le Berre-Scoul C, Hulin P, Neunlist M, Cissé M. The ephrin receptor EphB2 regulates the connectivity and activity of enteric neurons. J Biol Chem 2021; 297:101300. [PMID: 34648765 PMCID: PMC8569587 DOI: 10.1016/j.jbc.2021.101300] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 10/01/2021] [Accepted: 10/08/2021] [Indexed: 11/29/2022] Open
Abstract
Highly organized circuits of enteric neurons are required for the regulation of gastrointestinal functions, such as peristaltism or migrating motor complex. However, the factors and molecular mechanisms that regulate the connectivity of enteric neurons and their assembly into functional neuronal networks are largely unknown. A better understanding of the mechanisms by which neurotrophic factors regulate this enteric neuron circuitry is paramount to understanding enteric nervous system (ENS) physiology. EphB2, a receptor tyrosine kinase, is essential for neuronal connectivity and plasticity in the brain, but so far its presence and function in the ENS remain largely unexplored. Here we report that EphB2 is expressed preferentially by enteric neurons relative to glial cells throughout the gut in rats. We show that in primary enteric neurons, activation of EphB2 by its natural ligand ephrinB2 engages ERK signaling pathways. Long-term activation with ephrinB2 decreases EphB2 expression and reduces molecular and functional connectivity in enteric neurons without affecting neuronal density, ganglionic fiber bundles, or overall neuronal morphology. This is highlighted by a loss of neuronal plasticity markers such as synapsin I, PSD95, and synaptophysin, and a decrease of spontaneous miniature synaptic currents. Together, these data identify a critical role for EphB2 in the ENS and reveal a unique EphB2-mediated molecular program of synapse regulation in enteric neurons.
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Affiliation(s)
- Raphael Bodin
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France
| | - Vincent Paillé
- UMR 1280 Physiologie des Adaptations Nutritionnelles, INRA, Institut des Maladies de l'Appareil Digestif, Université de Nantes, Nantes, France
| | - Thibauld Oullier
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France
| | - Tony Durand
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France
| | - Philippe Aubert
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France
| | - Catherine Le Berre-Scoul
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France
| | | | - Michel Neunlist
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France
| | - Moustapha Cissé
- Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Université de Nantes, Nantes, France.
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Piette C, Vandecasteele M, Bosch-Bouju C, Goubard V, Paillé V, Cui Y, Mendes A, Perez S, Valtcheva S, Xu H, Pouget P, Venance L. Intracellular Properties of Deep-Layer Pyramidal Neurons in Frontal Eye Field of Macaque Monkeys. Front Synaptic Neurosci 2021; 13:725880. [PMID: 34621162 PMCID: PMC8490863 DOI: 10.3389/fnsyn.2021.725880] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 08/24/2021] [Indexed: 11/13/2022] Open
Abstract
Although many details remain unknown, several positive statements can be made about the laminar distribution of primate frontal eye field (FEF) neurons with different physiological properties. Most certainly, pyramidal neurons in the deep layer of FEF that project to the brainstem carry movement and fixation signals but clear evidence also support that at least some deep-layer pyramidal neurons projecting to the superior colliculus carry visual responses. Thus, deep-layer neurons in FEF are functionally heterogeneous. Despite the useful functional distinctions between neuronal responses in vivo, the underlying existence of distinct cell types remain uncertain, mostly due to methodological limitations of extracellular recordings in awake behaving primates. To substantiate the functionally defined cell types encountered in the deep layer of FEF, we measured the biophysical properties of pyramidal neurons recorded intracellularly in brain slices issued from macaque monkey biopsies. Here, we found that biophysical properties recorded in vitro permit us to distinguish two main subtypes of regular-spiking neurons, with, respectively, low-resistance and low excitability vs. high-resistance and strong excitability. These results provide useful constraints for cognitive models of visual attention and saccade production by indicating that at least two distinct populations of deep-layer neurons exist.
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Affiliation(s)
- Charlotte Piette
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Marie Vandecasteele
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Clémentine Bosch-Bouju
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Valérie Goubard
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Vincent Paillé
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Yihui Cui
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Alexandre Mendes
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Sylvie Perez
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Silvana Valtcheva
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Hao Xu
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
| | - Pierre Pouget
- INSERM, CNRS, Institut du Cerveau, Sorbonne Université, Paris, France
| | - Laurent Venance
- Dynamics and Pathophysiology of Neuronal Networks Team, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, PSL University, Paris, France
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Frapin M, Guignard S, Meistermann D, Grit I, Moullé VS, Paillé V, Parnet P, Amarger V. Maternal Protein Restriction in Rats Alters the Expression of Genes Involved in Mitochondrial Metabolism and Epitranscriptomics in Fetal Hypothalamus. Nutrients 2020; 12:nu12051464. [PMID: 32438566 PMCID: PMC7284977 DOI: 10.3390/nu12051464] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/12/2020] [Accepted: 05/13/2020] [Indexed: 12/18/2022] Open
Abstract
Fetal brain development is closely dependent on maternal nutrition and metabolic status. Maternal protein restriction (PR) is known to be associated with alterations in the structure and function of the hypothalamus, leading to impaired control of energy homeostasis and food intake. The objective of this study was to identify the cellular and molecular systems underlying these effects during fetal development. We combined a global transcriptomic analysis on the fetal hypothalamus from a rat model of maternal PR with in vitro neurosphere culture and cellular analyses. Several genes encoding proteins from the mitochondrial respiratory chain complexes were overexpressed in the PR group and mitochondrial metabolic activity in the fetal hypothalamus was altered. The level of the N6-methyladenosine epitranscriptomic mark was reduced in the PR fetuses, and the expression of several genes involved in the writing/erasing/reading of this mark was indeed altered, as well as genes encoding several RNA-binding proteins. Additionally, we observed a higher number of neuronal-committed progenitors at embryonic day 17 (E17) in the PR fetuses. Together, these data strongly suggest a metabolic adaptation to the amino acid shortage, combined with the post-transcriptional control of protein expression, which might reflect alterations in the control of the timing of neuronal progenitor differentiation.
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Affiliation(s)
- Morgane Frapin
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
| | - Simon Guignard
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
| | | | - Isabelle Grit
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
| | - Valentine S. Moullé
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
| | - Vincent Paillé
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
| | - Patricia Parnet
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
| | - Valérie Amarger
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, F-44000 Nantes, France; (M.F.); (S.G.); (I.G.); (V.S.M.); (V.P.); (P.P.)
- Correspondence:
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Paradis J, Boureau P, Moyon T, Nicklaus S, Parnet P, Paillé V. Perinatal Western Diet Consumption Leads to Profound Plasticity and GABAergic Phenotype Changes within Hypothalamus and Reward Pathway from Birth to Sexual Maturity in Rat. Front Endocrinol (Lausanne) 2017; 8:216. [PMID: 28900415 PMCID: PMC5581815 DOI: 10.3389/fendo.2017.00216] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/11/2017] [Indexed: 12/24/2022] Open
Abstract
Perinatal maternal consumption of energy dense food increases the risk of obesity in children. This is associated with an overconsumption of palatable food that is consumed for its hedonic property. The underlying mechanism that links perinatal maternal diet and offspring preference for fat is still poorly understood. In this study, we aim at studying the influence of maternal high-fat/high-sugar diet feeding [western diet (WD)] during gestation and lactation on the reward pathways controlling feeding in the rat offspring from birth to sexual maturity. We performed a longitudinal follow-up of WD and Control offspring at three critical time periods (childhood, adolescence, and adulthood) and focus on investigating the influence of perinatal exposure to palatable diet on (i) fat preference, (ii) gene expression profile, and (iii) neuroanatomical/architectural changes of the mesolimbic dopaminergic networks. We showed that WD feeding restricted to the perinatal period has a clear long-lasting influence on the organization of homeostatic and hedonic brain circuits but not on fat preference. We demonstrated a period specific evolution of the preference for fat that we correlated with specific brain molecular signatures. In offspring from WD fed dams, we observed during childhood the existence of fat preference associated with a higher expression of key gene involved in the dopamine (DA) systems; at adolescence, a high-fat preference for both groups, progressively reduced during the 3 days test for the WD group and associated with a reduced expression of key gene involved in the DA systems for the WD group that could suggest a compensatory mechanism to protect them from further high-fat exposure; and finally at adulthood, a preference for fat that was identical to control rats but associated with profound modification in key genes involved in the γ-aminobutyric acid network, serotonin receptors, and polysialic acid-NCAM-dependent remodeling of the hypothalamus. Altogether, these data reveal that maternal WD, restricted to the perinatal period, has no sustained impact on energy homeostasis and fat preference later in life even though a strong remodeling of the hypothalamic homeostatic and reward pathway involved in eating behavior occurred. Further functional experiments would be needed to understand the relevance of these circuits remodeling.
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Affiliation(s)
- Julie Paradis
- UMR 1280 Physiologie des Adaptations Nutritionnelles (PhAN), INRA, Université de Nantes, Institut des Maladies de l’Appareil Digestif (IMAD), Nantes, France
| | - Pierre Boureau
- UMR 1280 Physiologie des Adaptations Nutritionnelles (PhAN), INRA, Université de Nantes, Institut des Maladies de l’Appareil Digestif (IMAD), Nantes, France
| | - Thomas Moyon
- UMR 1280 Physiologie des Adaptations Nutritionnelles (PhAN), INRA, Université de Nantes, Institut des Maladies de l’Appareil Digestif (IMAD), Nantes, France
| | - Sophie Nicklaus
- UMR 1324 Centre des Sciences du Goût et de l’Alimentation (CSGA), INRA, CNRS, Université de Bourgogne, Dijon, France
| | - Patricia Parnet
- UMR 1280 Physiologie des Adaptations Nutritionnelles (PhAN), INRA, Université de Nantes, Institut des Maladies de l’Appareil Digestif (IMAD), Nantes, France
- *Correspondence: Patricia Parnet, ; Vincent Paillé,
| | - Vincent Paillé
- UMR 1280 Physiologie des Adaptations Nutritionnelles (PhAN), INRA, Université de Nantes, Institut des Maladies de l’Appareil Digestif (IMAD), Nantes, France
- *Correspondence: Patricia Parnet, ; Vincent Paillé,
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Parnet P, Paillé V, Bolaños Jimenez F, Kaeffer B, Schaal B, Bouret SG, Amarger V. L’expérience sensorielle et nutritionnelle des parents et leur état métabolique orientent le comportement alimentaire de leur descendance. Med Sci (Paris) 2016; 32:85-92. [DOI: 10.1051/medsci/20163201014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Cui Y, Paillé V, Xu H, Genet S, Delord B, Fino E, Berry H, Venance L. Endocannabinoids mediate bidirectional striatal spike-timing-dependent plasticity. J Physiol 2015; 593:2833-49. [PMID: 25873197 DOI: 10.1113/jp270324] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 04/10/2015] [Indexed: 01/27/2023] Open
Abstract
KEY POINTS Although learning can arise from few or even a single trial, synaptic plasticity is commonly assessed under prolonged activation. Here, we explored the existence of rapid responsiveness of synaptic plasticity at corticostriatal synapses in a major synaptic learning rule, spike-timing-dependent plasticity (STDP). We found that spike-timing-dependent depression (tLTD) progressively disappears when the number of paired stimulations (below 50 pairings) is decreased whereas spike-timing-dependent potentiation (tLTP) displays a biphasic profile: tLTP is observed for 75-100 pairings, is absent for 25-50 pairings and re-emerges for 5-10 pairings. This tLTP induced by low numbers of pairings (5-10) depends on activation of the endocannabinoid system, type-1 cannabinoid receptor and the transient receptor potential vanilloid type-1. Endocannabinoid-tLTP may represent a physiological mechanism operating during the rapid learning of new associative memories and behavioural rules characterizing the flexible behaviour of mammals or during the initial stages of habit learning. ABSTRACT Synaptic plasticity, a main substrate for learning and memory, is commonly assessed with prolonged stimulations. Since learning can arise from few or even a single trial, synaptic strength is expected to adapt rapidly. However, whether synaptic plasticity occurs in response to limited event occurrences remains elusive. To answer this question, we investigated whether a low number of paired stimulations can induce plasticity in a major synaptic learning rule, spike-timing-dependent plasticity (STDP). It is known that 100 pairings induce bidirectional STDP, i.e. spike-timing-dependent potentiation (tLTP) and depression (tLTD) at most central synapses. In rodent striatum, we found that tLTD progressively disappears when the number of paired stimulations is decreased (below 50 pairings) whereas tLTP displays a biphasic profile: tLTP is observed for 75-100 pairings, absent for 25-50 pairings and re-emerges for 5-10 pairings. This tLTP, induced by very few pairings (∼5-10) depends on the endocannabinoid (eCB) system. This eCB-dependent tLTP (eCB-tLTP) involves postsynaptic endocannabinoid synthesis, requires paired activity (post- and presynaptic) and the activation of type-1 cannabinoid receptor (CB1R) and transient receptor potential vanilloid type-1 (TRPV1). eCB-tLTP occurs in both striatopallidal and striatonigral medium-sized spiny neurons (MSNs) and is dopamine dependent. Lastly, we show that eCB-LTP and eCB-LTD can be induced sequentially in the same neuron, depending on the cellular conditioning protocol. Thus, while endocannabinoids are usually thought simply to depress synaptic function, they also constitute a versatile system underlying bidirectional plasticity. Our results reveal a novel form of synaptic plasticity, eCB-tLTP, which may underlie rapid learning capabilities characterizing behavioural flexibility.
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Affiliation(s)
- Yihui Cui
- Centre for Interdisciplinary Research in Biology, College de France, INSERM U1050, CNRS UMR7241, Labex Memolife, Paris, France.,University Pierre et Marie Curie, ED 158, Paris, France
| | - Vincent Paillé
- Centre for Interdisciplinary Research in Biology, College de France, INSERM U1050, CNRS UMR7241, Labex Memolife, Paris, France.,University Pierre et Marie Curie, ED 158, Paris, France
| | - Hao Xu
- Centre for Interdisciplinary Research in Biology, College de France, INSERM U1050, CNRS UMR7241, Labex Memolife, Paris, France.,University Pierre et Marie Curie, ED 158, Paris, France
| | - Stéphane Genet
- University Pierre et Marie Curie, ED 158, Paris, France.,Institute of Intelligent Systems and Robotics (ISIR), Paris, France
| | - Bruno Delord
- University Pierre et Marie Curie, ED 158, Paris, France.,Institute of Intelligent Systems and Robotics (ISIR), Paris, France
| | - Elodie Fino
- Centre for Interdisciplinary Research in Biology, College de France, INSERM U1050, CNRS UMR7241, Labex Memolife, Paris, France.,University Pierre et Marie Curie, ED 158, Paris, France
| | - Hugues Berry
- INRIA, Villeurbanne, France.,University of Lyon, LIRIS UMR5205, Villeurbanne, France
| | - Laurent Venance
- Centre for Interdisciplinary Research in Biology, College de France, INSERM U1050, CNRS UMR7241, Labex Memolife, Paris, France.,University Pierre et Marie Curie, ED 158, Paris, France
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Picconi B, Paillé V, Ghiglieri V, Bagetta V, Barone I, Lindgren HS, Bernardi G, Angela Cenci M, Calabresi P. l-DOPA dosage is critically involved in dyskinesia via loss of synaptic depotentiation. Neurobiol Dis 2008; 29:327-35. [DOI: 10.1016/j.nbd.2007.10.001] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Revised: 09/27/2007] [Accepted: 10/01/2007] [Indexed: 10/22/2022] Open
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10
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Paillé V, Henry V, Lescaudron L, Brachet P, Damier P. Rat model of Parkinson's disease with bilateral motor abnormalities, reversible with levodopa, and dyskinesias. Mov Disord 2007; 22:533-9. [PMID: 17230470 DOI: 10.1002/mds.21308] [Citation(s) in RCA: 51] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Parkinson's disease (PD) is characterized by the bilateral degeneration of the midbrain dopamine-containing neurons with the most severe lesion in the posterolateral part of the substantia nigra pars compacta (SNpc). In humans, such lesions lead to specific motor abnormalities (i.e., akinesia, rigidity, and tremor) that are greatly improved by levodopa treatment. After a few years, the beneficial effect of the treatment is frequently offset by the development of dyskinesias. To improve treatment strategies, an animal model showing most of the histological and clinical characteristics of the human disease is mandatory. Ten rats received a bilateral injection of small doses of 6-OHDA in the medial forebrain bundle (MFB) and were compared with five sham-lesioned rats. The 6-OHDA-lesioned rats progressively developed abnormal motor behavior (assessed by the stepping test) compared with the sham-lesioned rats. The lesioned rats greatly improved under levodopa treatment, but developed concomitant dyskinesias. All 6-OHDA-lesioned animals had bilateral partial lesions of the SNpc, with the most severe lesion being in its posterolateral part. There was a significant correlation between the severity of the dopaminergic cell loss and the severity of the levodopa-induced dyskinesias. These rats constitute an interesting model of PD, sharing some of the main characteristics of the human disease.
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Affiliation(s)
- Vincent Paillé
- INSERM, UMR 643 and Institut de Transplantation et de Recherche en Transplantation, CHU, Nantes, France
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Abstract
The pathogenesis of the motor fluctuations and dyskinesias that complicate levodopa treatment for Parkinson's disease (PD) remains uncertain. To evaluate the relationship between the degree of dopamine neuron loss and the severity of dyskinesias in a rodent model of PD, Sprague-Dawley rats were lesioned unilaterally using different doses of 6-hydroxydopamine injected into the substantia nigra pars compacta (SNc). All rats received two daily oral doses of levodopa for one month. In most of the animals chronic levodopa administration induced abnormal involuntary movements (AIMs), which were in some respects similar to human dyskinesias. We found that a minimum dopamine cell loss of around 95% was required for the development of dyskinesias after one-month of levodopa treatment. Moreover, we observed a positive relationship between the percentage dopaminergic cell loss in the SNc and the severity of levodopa-induced AIMs.
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Affiliation(s)
- Vincent Paillé
- INSERM, Unité 437, CHU de Nantes, 30 bd Jean Monnet, 44093 Nantes, France.
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Abstract
Inflammatory processes in the brain may trigger specific neuroprotective responses in glial cells. Here, we show that bacterial lipopolysaccharide strongly up-regulates glial derived neurotrophic factor (GDNF) mRNA while it down-regulates that of neurturin. Tumor necrosis factor alpha (TNFalpha) had different effects since it stimulated neurturin expression without enhancing GDNF mRNA. Interestingly, both lipopolysaccharide and TNFalpha triggered a significant decrease in the expression of the GDNF receptor, GFRalpha1, in glial cells. While the significance of such down-regulation during inflammatory processes remains to be characterised, the differential regulation of GDNF and neurturin following lipopolysaccharide and TNFalpha treatments suggest specific neuroprotective responses of glial cells in case of bacterial infection, trauma, transplantation or neurodegenerative diseases.
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Affiliation(s)
- Séverine Rémy
- Institut National de la Santé et de la Recherche Médicale, Unite 437, Centre Hospitalier Universitaire de Nantes, 30 Boulevard Jean Monnet, 44093 Nantes, France
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