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Fabian CB, Jordan ND, Cole RH, Carley LG, Thompson SM, Seney ML, Joffe ME. Parvalbumin interneuron mGlu 5 receptors govern sex differences in prefrontal cortex physiology and binge drinking. Neuropsychopharmacology 2024:10.1038/s41386-024-01889-0. [PMID: 38773314 DOI: 10.1038/s41386-024-01889-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 05/06/2024] [Accepted: 05/07/2024] [Indexed: 05/23/2024]
Abstract
Despite established sex differences in the prevalence and presentation of psychiatric disorders, little is known about the cellular and synaptic mechanisms that guide these differences under basal conditions. The proper function of the prefrontal cortex (PFC) is essential for the top-down regulation of motivated behaviors. The activity of the PFC is tightly controlled by parvalbumin-expressing interneurons (PV-INs), a key subpopulation of fast-spiking GABAergic cells that regulate cortical excitability through direct innervations onto the perisomatic regions of nearby pyramidal cells. Recent rodent studies have identified notable sex differences in PV-IN activity and adaptations to experiences such as binge drinking. Here, we investigated the cellular and molecular mechanisms that underlie sex-specific regulation of PFC PV-IN function. Using whole-cell patch-clamp electrophysiology and selective pharmacology, we report that PV-INs from female mice are more excitable than those from males. Moreover, we find that mGlu1 and mGlu5 metabotropic glutamate receptors regulate cell excitability, excitatory drive, and endocannabinoid signaling at PFC PV-INs in a sex-dependent manner. Genetic deletion of mGlu5 receptors from PV-expressing cells abrogates all sex differences observed in PV-IN membrane and synaptic physiology. Lastly, we report that female, but not male, PV-mGlu5-/- mice exhibit decreased voluntary drinking on an intermittent access schedule, which could be related to changes in ethanol's stimulant properties. Importantly, these studies identify mGlu1 and mGlu5 receptors as candidate signaling molecules involved in sex differences in PV-IN activity and behaviors relevant to alcohol use.
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Affiliation(s)
- Carly B Fabian
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA
| | - Nilah D Jordan
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA
| | - Rebecca H Cole
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA
| | - Lily G Carley
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA
| | - Shannon M Thompson
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA
| | - Marianne L Seney
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA
| | - Max E Joffe
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA.
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA, USA.
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA.
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Fabian CB, Jordan ND, Cole RH, Carley LG, Thompson SM, Seney ML, Joffe ME. Parvalbumin interneuron mGlu 5 receptors govern sex differences in prefrontal cortex physiology and binge drinking. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.11.20.567903. [PMID: 38045379 PMCID: PMC10690210 DOI: 10.1101/2023.11.20.567903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Despite established sex differences in the prevalence and presentation of psychiatric disorders, little is known about the cellular and synaptic mechanisms that guide these differences under basal conditions. Proper function of the prefrontal cortex (PFC) is essential for the top-down regulation of motivated behaviors. Activity of the PFC is tightly controlled by parvalbumin-expressing interneurons (PV-INs), a key subpopulation of fast-spiking GABAergic cells that regulate cortical excitability through direct innervations onto the perisomatic regions of nearby pyramidal cells. Recent rodent studies have identified notable sex differences in PV-IN activity and adaptations to experiences such as binge drinking. Here, we investigated the cellular and molecular mechanisms that underlie sex-specific regulation of PFC PV-IN function. Using whole-cell patch clamp electrophysiology and selective pharmacology, we report that PV-INs from female mice are more excitable than those from males. Moreover, we find that mGlu1 and mGlu5 metabotropic glutamate receptors regulate cell excitability, excitatory drive, and endocannabinoid signaling at PFC PV-INs in a sex-dependent manner. Genetic deletion of mGlu5 receptors from PV-expressing cells abrogates all sex differences observed in PV-IN membrane and synaptic physiology. Lastly, we report that female, but not male, PV-mGlu5-/- mice exhibit decreased voluntary drinking on an intermittent access schedule, which could be related to changes in ethanol's stimulant properties. Importantly, these studies identify mGlu1 and mGlu5 receptors as candidate signaling molecules involved in sex differences in PV-IN activity and behaviors relevant for alcohol use.
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Affiliation(s)
- Carly B Fabian
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
| | - Nilah D Jordan
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
| | - Rebecca H Cole
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
| | - Lily G Carley
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
| | - Shannon M Thompson
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
| | - Marianne L Seney
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
| | - Max E Joffe
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Translational Neuroscience Program, University of Pittsburgh, Pittsburgh, PA
- Center for Neuroscience University of Pittsburgh, Pittsburgh, PA
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Nicoletti F, Di Menna L, Iacovelli L, Orlando R, Zuena AR, Conn PJ, Dogra S, Joffe ME. GPCR interactions involving metabotropic glutamate receptors and their relevance to the pathophysiology and treatment of CNS disorders. Neuropharmacology 2023; 235:109569. [PMID: 37142158 DOI: 10.1016/j.neuropharm.2023.109569] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 04/18/2023] [Accepted: 05/02/2023] [Indexed: 05/06/2023]
Abstract
Cellular responses to metabotropic glutamate (mGlu) receptor activation are shaped by mechanisms of receptor-receptor interaction. mGlu receptor subtypes form homodimers, intra- or inter-group heterodimers, and heteromeric complexes with other G protein-coupled receptors (GPCRs). In addition, mGlu receptors may functionally interact with other receptors through the βγ subunits released from G proteins in response to receptor activation or other mechanisms. Here, we discuss the interactions between (i) mGlu1 and GABAB receptors in cerebellar Purkinje cells; (ii) mGlu2 and 5-HT2Aserotonergic receptors in the prefrontal cortex; (iii) mGlu5 and A2A receptors or mGlu5 and D1 dopamine receptors in medium spiny projection neurons of the indirect and direct pathways of the basal ganglia motor circuit; (iv) mGlu5 and A2A receptors in relation to the pathophysiology of Alzheimer's disease; and (v) mGlu7 and A1 adenosine or α- or β1 adrenergic receptors. In addition, we describe in detail a novel form of non-heterodimeric interaction between mGlu3 and mGlu5 receptors, which appears to be critically involved in mechanisms of activity-dependent synaptic plasticity in the prefrontal cortex and hippocampus. Finally, we highlight the potential implication of these interactions in the pathophysiology and treatment of cerebellar disorders, schizophrenia, Alzheimer's disease, Parkinson's disease, l-DOPA-induced dyskinesias, stress-related disorders, and cognitive dysfunctions.
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Affiliation(s)
- Ferdinando Nicoletti
- Department of Physiology and Pharmacology, Sapienza University of Rome, Italy; IRCCS Neuromed, Pozzilli, Italy.
| | | | - Luisa Iacovelli
- Department of Physiology and Pharmacology, Sapienza University of Rome, Italy
| | - Rosamaria Orlando
- Department of Physiology and Pharmacology, Sapienza University of Rome, Italy; IRCCS Neuromed, Pozzilli, Italy
| | - Anna Rita Zuena
- Department of Physiology and Pharmacology, Sapienza University of Rome, Italy
| | - P Jeffrey Conn
- Department of Pharmacology, Italy; Warren Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, TN, 37232, USA
| | - Shalini Dogra
- Department of Pharmacology, Italy; Warren Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, TN, 37232, USA
| | - Max E Joffe
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, 15219, USA
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Ji C, Yang J, Lin L, Chen S. Evaluating the Cognitive Effects of Video-Induced Negative Affect in College Students: A Comparative Study between Acute Exercise and Music Listening. J Intell 2023; 11:jintelligence11010012. [PMID: 36662142 PMCID: PMC9861909 DOI: 10.3390/jintelligence11010012] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 12/15/2022] [Accepted: 01/03/2023] [Indexed: 01/07/2023] Open
Abstract
Background: Video-induced negative affect may have an impact on cognition. In this study, acute exercise and music listening are used to explore their impact on individual cognition with video-induced negative affect. Method: All the participants were randomly divided into six groups. Group 1 (n = 19, average age = 20.15) was not given any form of acute exercise or music listening; Group 2 (n = 20, average age = 21.33) was given music listening; Group 3 (n = 20, average age = 20.89) was given acute exercise; Group 4 (n = 20, average age = 21.03) only watched a video without being given any acute exercise or music listening; Group 5 (n = 19, average age = 20.68) was given music listening after watching a video; Group 6 (n = 18, average age = 21.32) was given acute exercise after watching a video. Results: In the pre-test, we found that there was no significant difference in negative affect, positive affect, and cognitive performance among the groups (p > .05). The post-test indicated that the negative affect of college students who watched the video (20.16 ± 8.34) was higher than that of college students who did not watch the video (11.12 ± 3.29). Acute exercise and music listening improved the cognitive performance of college students with video-induced negative affect. Acute exercise improved the cognitive performance of college students with non-video-induced negative affect, while music listening did not. Conclusion: The acute decline in the cognitive performance of college students caused by video-induced negative affect can be ameliorated by means of acute exercise and music listening.
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Affiliation(s)
- Chaoxin Ji
- Physical Education Department, Northeastern University, Shenyang 110819, China
- Correspondence: (C.J.); (S.C.)
| | - Jun Yang
- College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Lin Lin
- School of Social and Political Science, University of Glasgow, Glasgow G12 8QQ, UK
| | - Song Chen
- Physical Education Department, Northeastern University, Shenyang 110819, China
- Correspondence: (C.J.); (S.C.)
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An inpatient human laboratory study assessing the safety and tolerability, pharmacokinetics, and biobehavioral effect of GET 73 when co-administered with alcohol in individuals with alcohol use disorder. Psychopharmacology (Berl) 2022; 239:35-46. [PMID: 34731268 PMCID: PMC8865311 DOI: 10.1007/s00213-021-06008-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 10/08/2021] [Indexed: 12/17/2022]
Abstract
RATIONALE Previous work suggests that GET 73, a novel compound with putative activity on the metabotropic glutamate receptor subtype 5 (mGluR5), may represent a novel pharmacological treatment for alcohol use disorder (AUD). OBJECTIVE In this study, we investigated the safety, tolerability, pharmacokinetics, and biobehavioral effects of GET 73, when co-administered with alcohol, in individuals with alcohol dependence (AD). METHODS This was an inpatient, cross-over, randomized, double-blind, placebo-controlled, human laboratory study with non-treatment-seeking, alcohol-dependent individuals. The study used a within-subject design, with two counterbalanced stages, during which participants received GET 73 and then placebo, or vice versa. During each stage, participants underwent an alcohol interaction session and, on a separate day, an alcohol cue reactivity, followed by an alcohol self-administration session. RESULTS Safety outcomes of GET 73 were excellent with no serious adverse events, nor adverse events of severe grade. The co-administration of alcohol and GET 73 did not affect the pharmacokinetics of GET 73 or alcohol. GET 73, compared to placebo, did not affect the alcohol-related stimulation effects, but increased the subjective sedative effects of alcohol. GET 73 did not affect alcohol cue-induced craving, or alcohol self-administration in the laboratory. CONCLUSIONS The study confirms the safety and tolerability of GET 73 when co-administered with alcohol. Although, under this experimental condition, we did not detect an effect on alcohol craving and consumption in the laboratory, additional studies should be conducted administering GET 73 for an extended period in an outpatient setting.
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Genetic and Brain Mechanisms of Addictive Behavior and Neuroadaptation. Brain Sci 2021; 12:brainsci12010051. [PMID: 35053795 PMCID: PMC8773497 DOI: 10.3390/brainsci12010051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 12/29/2021] [Indexed: 11/23/2022] Open
Abstract
Genetic differences play a role in the susceptibility to addictive drug use, the probability that the use of these drugs will escalate and result in a drug use disorder, and whether relapse to use will occur during or after treatment [...].
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Winters ND, Bedse G, Astafyev AA, Patrick TA, Altemus M, Morgan AJ, Mukerjee S, Johnson KD, Mahajan VR, Uddin MJ, Kingsley PJ, Centanni SW, Siciliano CA, Samuels DC, Marnett LJ, Winder DG, Patel S. Targeting diacylglycerol lipase reduces alcohol consumption in preclinical models. J Clin Invest 2021; 131:146861. [PMID: 34292886 PMCID: PMC8409586 DOI: 10.1172/jci146861] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 07/20/2021] [Indexed: 12/13/2022] Open
Abstract
Alcohol use disorder (AUD) is associated with substantial morbidity, mortality, and societal cost, and pharmacological treatment options for AUD are limited. The endogenous cannabinoid (eCB) signaling system is critically involved in reward processing and alcohol intake is positively correlated with release of the eCB ligand 2-Arachidonoylglycerol (2-AG) within reward neurocircuitry. Here we show that genetic and pharmacological inhibition of diacylglycerol lipase (DAGL), the rate limiting enzyme in the synthesis of 2-AG, reduces alcohol consumption in a variety of preclinical models ranging from a voluntary free-access model to aversion resistant-drinking and dependence-like drinking induced via chronic intermittent ethanol vapor exposure in mice. DAGL inhibition during either chronic alcohol consumption or protracted withdrawal was devoid of anxiogenic and depressive-like behavioral effects. Lastly, DAGL inhibition also prevented ethanol-induced suppression of GABAergic transmission onto midbrain dopamine neurons, providing mechanistic insight into how DAGL inhibition could affect alcohol reward. These data suggest reducing 2-AG signaling via inhibition of DAGL could represent an effective approach to reduce alcohol consumption across the spectrum of AUD severity.
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Affiliation(s)
- Nathan D. Winters
- Department of Psychiatry and Behavioral Sciences
- Vanderbilt Center for Addiction Research
- Department of Pharmacology
| | - Gaurav Bedse
- Department of Psychiatry and Behavioral Sciences
- Vanderbilt Center for Addiction Research
| | | | | | | | | | - Snigdha Mukerjee
- Vanderbilt Center for Addiction Research
- Department of Pharmacology
| | | | | | - Md Jashim Uddin
- Departments of Biochemistry and Chemistry, A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Vanderbilt Institute of Chemical Biology
| | - Philip J. Kingsley
- Departments of Biochemistry and Chemistry, A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Vanderbilt Institute of Chemical Biology
| | - Samuel W. Centanni
- Vanderbilt Center for Addiction Research
- Department of Molecular Physiology and Biophysics
- Vanderbilt Brain Institute, and
| | - Cody A. Siciliano
- Vanderbilt Center for Addiction Research
- Department of Pharmacology
- Vanderbilt Brain Institute, and
| | - David C. Samuels
- Department of Molecular Physiology and Biophysics
- Vanderbilt Genetics Institute, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Lawrence J. Marnett
- Department of Pharmacology
- Departments of Biochemistry and Chemistry, A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Vanderbilt Institute of Chemical Biology
| | - Danny G. Winder
- Vanderbilt Center for Addiction Research
- Department of Molecular Physiology and Biophysics
- Vanderbilt Brain Institute, and
| | - Sachin Patel
- Department of Psychiatry and Behavioral Sciences
- Vanderbilt Center for Addiction Research
- Department of Pharmacology
- Department of Molecular Physiology and Biophysics
- Vanderbilt Brain Institute, and
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Kasten CR, Holmgren EB, Lerner MR, Wills TA. BNST specific mGlu5 receptor knockdown regulates sex-dependent expression of negative affect produced by adolescent ethanol exposure and adult stress. Transl Psychiatry 2021; 11:178. [PMID: 33731684 PMCID: PMC7969933 DOI: 10.1038/s41398-021-01285-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 01/21/2021] [Accepted: 02/18/2021] [Indexed: 12/11/2022] Open
Abstract
Adolescent alcohol use is one of the strongest predictors for the development of an alcohol use disorder (AUD). Notably, this period of risk coincides with the development of affective disorders, which disproportionately impact and drive problematic drinking behavior in women. Stress is a particularly salient factor that drives relapse during periods of abstinence. Previous work in our lab has shown that adolescent intermittent ethanol vapor (AIE) produces sex-dependent changes in glutamatergic activity in the bed nucleus of the stria terminalis (BNST) and behavioral outcomes following acute restraint stress in adulthood. In females, AIE disrupts group 1 metabotropic glutamate (mGlu1/5) receptor activity and enhances anhedonia-like behavior. The current study site-specifically knocked down mGlu5 receptors in the BNST of male and female Grm5loxp mice, exposed them to AIE, and observed the interaction of AIE and stress on negative affect-like behaviors in adulthood. These negative affect-like behaviors included the novelty-induced hypophagia task following acute restraint stress, open field activity, and contextual fear conditioning. Overall, we replicated our previous findings that AIE enhanced anhedonia-like activity in the novelty-induced hypophagia task in females and fear acquisition in males. The primary effect of BNST-mGlu5 receptor knockdown was that it independently enhanced anhedonia-like activity in females. Correlation analyses revealed that behavior in these paradigms showed poor interdependence. These results indicate that preclinical models of negative affective-like states encompass distinct features that may have independent, clinically relevant mechanisms. Further, modulating mGlu5 receptors is a prospective treatment target for females experiencing anhedonic-like states that make them susceptible to alcohol relapse.
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Affiliation(s)
- Chelsea R Kasten
- Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA, USA
| | - Eleanor B Holmgren
- Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA, USA
| | - Mollie R Lerner
- Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA, USA
| | - Tiffany A Wills
- Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA, USA.
- Neuroscience Center of Excellence, LSU Health Sciences Center New Orleans, New Orleans, LA, USA.
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Joffe ME, Winder DG, Conn PJ. Increased Synaptic Strength and mGlu 2/3 Receptor Plasticity on Mouse Prefrontal Cortex Intratelencephalic Pyramidal Cells Following Intermittent Access to Ethanol. Alcohol Clin Exp Res 2021; 45:518-529. [PMID: 33434325 DOI: 10.1111/acer.14546] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 01/04/2021] [Indexed: 12/23/2022]
Abstract
BACKGROUND The medial prefrontal cortex (PFC) is crucial for regulating craving and alcohol seeking in alcohol use disorder (AUD) patients and alcohol seeking in animal models. Maladaptive changes in volitional ethanol (EtOH) intake have been associated with PFC function, yet synaptic adaptations within PFC have not been consistently detected in voluntary drinking rodent models. At least 80% of the neurons in PFC are glutamatergic pyramidal cells. Pyramidal cells provide the predominant cortical output to several brain regions relevant to AUD, including structures within the telencephalon (IT: e.g., basal ganglia, amygdala, other neocortical regions) and outside the telencephalon (ET: e.g., lateral hypothalamus, midbrain monoaminergic structures, thalamus). METHODS In addition to their anatomical distinctions, studies from several laboratories have revealed that prefrontal cortical IT and ET pyramidal cells may be differentiated by specific electrophysiological parameters. These distinguishable parameters make it possible to readily classify pyramidal cells into separable subtypes. Here, we employed and validated the hyperpolarization sag ratio as a diagnostic proxy for separating ET (type A) and IT (type B) neurons. We recorded from deep-layer prelimbic PFC pyramidal cells of mice 1 day after 4 to 5 weeks of intermittent access (IA) EtOH exposure. RESULTS Membrane properties were not altered by IA EtOH, but excitatory postsynaptic strength onto IT type B neurons was selectively enhanced in slices from IA EtOH mice. The increased excitatory drive was accompanied by enhanced mGlu2/3 receptor plasticity on IT type B neurons, providing a potential translational approach to mitigate cognitive and motivational changes to PFC function related to binge drinking. CONCLUSIONS Together, these studies provide insight into the specific PFC neurocircuits altered by voluntary drinking. In addition, the findings provide an additional rationale for developing compounds that potentiate mGlu2 and/or mGlu3 receptor function as potential treatments for AUD.
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Affiliation(s)
- Max E Joffe
- Department of Pharmacology, Vanderbilt University, Nashville, TN, USA.,Warren Center for Neuroscience Drug Discovery, Nashville, TN, USA.,Vanderbilt Center for Addiction Research, Nashville, TN, USA
| | - Danny G Winder
- Department of Pharmacology, Vanderbilt University, Nashville, TN, USA.,Vanderbilt Center for Addiction Research, Nashville, TN, USA.,Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA
| | - P Jeffrey Conn
- Department of Pharmacology, Vanderbilt University, Nashville, TN, USA.,Warren Center for Neuroscience Drug Discovery, Nashville, TN, USA.,Vanderbilt Center for Addiction Research, Nashville, TN, USA
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The infralimbic cortex and mGlu5 mediate the effects of chronic intermittent ethanol exposure on fear learning and memory. Psychopharmacology (Berl) 2020; 237:3417-3433. [PMID: 32767063 PMCID: PMC7572878 DOI: 10.1007/s00213-020-05622-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 07/27/2020] [Indexed: 01/19/2023]
Abstract
RATIONALE AND OBJECTIVES Alcohol use disorder (AUD) and post-traumatic stress disorder (PTSD) often occur comorbidly. While the incidence of these disorders is increasing, there is little investigation into the interacting neural mechanisms between these disorders. These studies aim to identify cognitive deficits that occur as a consequence of fear and ethanol exposure, implement a novel pharmaceutical intervention, and determine relevant underlying neurocircuitry. Additionally, due to clinical sex differences in PTSD prevalence and alcohol abuse, these studies examine the nature of this relationship in rodent models. METHODS Animals were exposed to a model of PTSD+AUD using auditory fear conditioning followed by chronic intermittent ethanol exposure (CIE). Then, rats received extinction training consisting of multiple conditioned stimulus presentations in absence of the shock. Extinction recall and context-induced freezing were measured in subsequent tests. CDPPB, a metabotropic glutamate receptor 5 (mGlu5) positive allosteric modulator, was used to treat these deficits, and region-specific effects were determined using microinjections. RESULTS These studies determined that CIE exposure led to deficits in fear extinction learning and heightened context-induced freezing while sex differences emerged in fear conditioning and extinction cue recall tests. Furthermore, using CDPPB, these studies found that enhancement of infralimbic (IfL) mGlu5 activity was able to recover CIE-induced deficits in both males and females. CONCLUSIONS These studies show that CIE induces deficits in fear-related behaviors and that enhancement of IfL glutamatergic activity can facilitate learning during extinction. Additionally, we identify novel pharmacological targets for the treatment of individuals who suffer from PTSD and AUD.
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Kasten CR, Carzoli KL, Sharfman NM, Henderson T, Holmgren EB, Lerner MR, Miller MC, Wills TA. Adolescent alcohol exposure produces sex differences in negative affect-like behavior and group I mGluR BNST plasticity. Neuropsychopharmacology 2020; 45:1306-1315. [PMID: 32268346 PMCID: PMC7297734 DOI: 10.1038/s41386-020-0670-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 03/27/2020] [Accepted: 03/31/2020] [Indexed: 12/13/2022]
Abstract
Adolescent alcohol exposure increases the risk of developing alcohol use disorders (AUDs), yet the mechanisms responsible for this vulnerability remain largely unknown. One potential target for alcohol-induced changes is the circuitry that modulates negative affect and stress, two sexually dependent drivers of alcohol relapse. The bed nucleus of the stria terminalis (BNST) is a sexually dimorphic region that critically regulates negative affective- and stress-induced relapse. Group I metabotropic glutamate receptors (mGluR) are a target of interest due to their regulation of stress, anxiety behaviors, and BNST plasticity. The current studies investigate sex-dependent sensitivity to the effects of adolescent intermittent ethanol vapor exposure (AIE) on negative affect during acute and protracted alcohol withdrawal and following stress in adulthood. This work also assessed whether BNST group I mGluR-mediated long-term depression (LTD) was disrupted at these timepoints. During acute withdrawal, AIE altered LTD induced by the group I mGluR antagonist DHPG in females, but not males. During adulthood, stress unmasked persistent changes in DHPG-induced LTD and behavior that were not present under basal conditions. Females with an AIE history demonstrated enhanced negative affective-like behavior in the novelty-induced hypophagia test following restraint stress-a phenotype that could be blocked with systemic mGluR5 allosteric antagonism via MTEP. Conversely, males with an AIE history demonstrated elevated freezing in a contextual fear conditioning paradigm. These studies demonstrate long-lasting, sex-dependent phenotypes produced by AIE and suggest pharmaceutical interventions for alcohol use and comorbid disorders may be more effective if designed with sex differences in mind.
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Affiliation(s)
- C. R. Kasten
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - K. L. Carzoli
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - N. M. Sharfman
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - T. Henderson
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - E. B. Holmgren
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - M. R. Lerner
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - M. C. Miller
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA
| | - T. A. Wills
- 0000 0000 8954 1233grid.279863.1Department of Cell Biology and Anatomy, LSU Health Sciences Center New Orleans, New Orleans, LA USA ,0000 0000 8954 1233grid.279863.1Neuroscience Center of Excellence, LSU Health Sciences Center New Orleans, New Orleans, LA USA
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Effects of the Positive Allosteric Modulator of Metabotropic Glutamate Receptor 5, VU-29, on Maintenance Association between Environmental Cues and Rewarding Properties of Ethanol in Rats. Biomolecules 2020; 10:biom10050793. [PMID: 32443872 PMCID: PMC7277181 DOI: 10.3390/biom10050793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 05/16/2020] [Accepted: 05/18/2020] [Indexed: 12/28/2022] Open
Abstract
: Metabotropic glutamate subtype 5 (mGlu5) receptors are implicated in various forms of synaptic plasticity, including drugs of abuse. In drug-addicted individuals, associative memories can drive relapse to drug use. The present study investigated the potential of the mGlu5 receptor positive allosteric modulator (PAM), VU-29 (30 mg/kg, i.p.), to inhibit the maintenance of a learned association between ethanol and environmental context by using conditioned place preference (CPP) in rats. The ethanol-CPP was established by the administration of ethanol (1.0 g/kg, i.p. × 10 days) using an unbiased procedure. Following ethanol conditioning, VU-29 was administered at various post-conditioning times (ethanol free state at the home cage) to ascertain if there was a temporal window during which VU-29 would be effective. Our experiments indicated that VU-29 did not affect the expression of ethanol-induced CPP when it was given over two post-conditioning days. However, the expression of ethanol-CPP was inhibited by 10-day home cage administration of VU-29, but not by first 2-day or last 2-day injection of VU-29 during the 10-day period. These findings reveal that VU-29 can inhibit the maintenance of ethanol-induced CPP, and that treatment duration contributes to this effect of VU-29. Furthermore, VU-29 effect was reversed by pretreatment with either MTEP (the mGlu5 receptor antagonist), or MK-801 (the N-methyl-D-aspartate-NMDA receptor antagonist). Thus, the inhibitory effect of VU-29 is dependent on the functional interaction between mGlu5 and NMDA receptors. Because a reduction in ethanol-associated cues can reduce relapse, mGlu5 receptor PAM would be useful for therapy of alcoholism. Future research is required to confirm the current findings.
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Johnson KA, Lovinger DM. Allosteric modulation of metabotropic glutamate receptors in alcohol use disorder: Insights from preclinical investigations. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2020; 88:193-232. [PMID: 32416868 DOI: 10.1016/bs.apha.2020.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Metabotropic glutamate (mGlu) receptors are family C G protein-coupled receptors (GPCRs) that modulate neuronal excitability and synaptic transmission throughout the nervous system. Owing to recent advances in development of subtype-selective allosteric modulators of mGlu receptors, individual members of the mGlu receptor family have been proposed as targets for treating a variety of neurological and psychiatric disorders, including substance use disorders. In this chapter, we highlight preclinical evidence that allosteric modulators of mGlu receptors could be useful for reducing alcohol consumption and preventing relapse in alcohol use disorder (AUD). We begin with an overview of the preclinical models that are used to study mGlu receptor involvement in alcohol-related behaviors. Alcohol exposure causes adaptations in both expression and function of various mGlu receptor subtypes, and pharmacotherapies aimed at reversing these adaptations have the potential to reduce alcohol consumption and seeking. Positive allosteric modulators (PAMs) of mGlu2 and negative allosteric modulators of mGlu5 show particular promise for reducing alcohol intake and/or preventing relapse. Finally, this chapter discusses important considerations for translating preclinical findings toward the development of clinically useful drugs, including the potential for PAMs to avoid tolerance issues that are frequently observed with repeated administration of GPCR agonists.
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Affiliation(s)
- Kari A Johnson
- Department of Pharmacology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States.
| | - David M Lovinger
- Laboratory for Integrative Neuroscience, National Institute on Alcohol Abuse and Alcoholism, US National Institutes of Health, Rockville, MD, United States
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