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Jones MJ, Uzuneser TC, Clement T, Wang H, Ojima I, Rushlow WJ, Laviolette SR. Inhibition of fatty acid binding protein-5 in the basolateral amygdala induces anxiolytic effects and accelerates fear memory extinction. Psychopharmacology (Berl) 2024; 241:119-138. [PMID: 37747506 DOI: 10.1007/s00213-023-06468-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 09/11/2023] [Indexed: 09/26/2023]
Abstract
RATIONALE The endocannabinoid (eCB) system critically controls anxiety and fear-related behaviours. Anandamide (AEA), a prominent eCB ligand, is a hydrophobic lipid that requires chaperone proteins such as Fatty Acid Binding Proteins (FABPs) for intracellular transport. Intracellular AEA transport is necessary for degradation, so blocking FABP activity increases AEA neurotransmission. OBJECTIVE To investigate the effects of a novel FABP5 inhibitor (SBFI-103) in the basolateral amygdala (BLA) on anxiety and fear memory. METHODS We infused SBFI-103 (0.5 μg-5 μg) to the BLA of adult male Sprague Dawley rats and ran various anxiety and fear memory behavioural assays, neurophysiological recordings, and localized molecular signaling analyses. We also co-infused SBFI-103 with the AEA inhibitor, LEI-401 (3 μg and 10 μg) to investigate the potential role of AEA in these phenomena. RESULTS Acute intra-BLA administration of SBFI-103 produced strong anxiolytic effects across multiple behavioural tests. Furthermore, animals exhibited acute and long-term accelerated associative fear memory extinction following intra-BLA FABP5 inhibition. In addition, BLA FABP5 inhibition induced strong modulatory effects on putative PFC pyramidal neurons along with significantly increased gamma oscillation power. Finally, we observed local BLA changes in the phosphorylation activity of various anxiety- and fear memory-related molecular biomarkers in the PI3K/Akt and MAPK/Erk signaling pathways. At all three levels of analyses, we found the functional effects of SBFI-103 depend on availability of the AEA ligand. CONCLUSIONS These findings demonstrate a novel intra-BLA FABP5 signaling mechanism regulating anxiety and fear memory behaviours, neuronal activity states, local anxiety-related molecular pathways, and functional AEA modulation.
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Affiliation(s)
- Matthew J Jones
- Department of Neuroscience, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St, London, ON, Canada
| | - Taygun C Uzuneser
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St, London, ON, Canada
| | - Timothy Clement
- Institute of Chemical Biology and Drug Discoveries, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, USA
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, USA
| | - Hehe Wang
- Institute of Chemical Biology and Drug Discoveries, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, USA
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, USA
| | - Iwao Ojima
- Institute of Chemical Biology and Drug Discoveries, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, USA
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, USA
| | - Walter J Rushlow
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St, London, ON, Canada
- Department of Psychiatry, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St, London, ON, Canada
| | - Steven R Laviolette
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St, London, ON, Canada.
- Department of Psychiatry, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St, London, ON, Canada.
- Lawson Health Research Institute, 268 Grosvenor St, London, ON, Canada.
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Grizzell JA, Vanbaelinghem M, Westerman J, Saddoris MP. Voluntary alcohol consumption during distinct phases of adolescence differentially alters adult fear acquisition, extinction and renewal in male and female rats. Stress 2023; 26:2278315. [PMID: 37916300 PMCID: PMC11042498 DOI: 10.1080/10253890.2023.2278315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 10/25/2023] [Indexed: 11/03/2023] Open
Abstract
Alcohol use during adolescence coincides with elevated risks of stress-related impairment in adults, particularly via disrupted developmental trajectories of vulnerable corticolimbic and mesolimbic systems involved in fear processing. Prior work has investigated the impact of binge-like alcohol consumption on adult fear and stress, but less is known about whether voluntarily consumed alcohol imparts differential effects based on adolescence phases and biological sex. Here, adolescent male and female Long Evans rats were granted daily access to alcohol (15%) during either early (Early-EtOH; P25-45) or late adolescence (Late-EtOH; P45-55) using a modified drinking-in-the-dark design. Upon adulthood (P75-80), rats were exposed to a three-context (ABC) fear renewal procedure. We found that male and female Early-EtOH rats showed faster acquisition of fear but less freezing during early phases of extinction and throughout fear renewal. In the extinction period specifically, Early-EtOH rats showed normal levels of freezing in the presence of fear-associated cues, but abnormally low freezing immediately after cue offset, suggesting a key disruption in contextual processing and/or novelty seeking brought by early adolescent binge consumption. While the effects of alcohol were most pronounced in the Early-EtOH rats (particularly in females), Late-EtOH rats displayed some changes in fear behavior including slower fear acquisition, faster extinction, and reduced renewal compared with controls, but primarily in males. Our results suggest that early adolescence in males and females and, to a lesser extent, late adolescence in males is a particularly vulnerable period wherein alcohol use can promote stress-related dysfunction in adulthood. Furthermore, our results provide multiple bases for future research focused on developmental correlates of alcohol mediated disruption in the brain.
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Affiliation(s)
- J Alex Grizzell
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
- Dept of Neuroscience and Behavioral Biology, Emory University, Atlanta GA 30322
| | - Maryam Vanbaelinghem
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
| | - Jessica Westerman
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
| | - Michael P Saddoris
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
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3
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Alex Grizzell J, Vanbaelinghem M, Westerman J, Saddoris MP. Voluntary alcohol consumption during distinct phases of adolescence differentially alters adult fear acquisition, extinction and renewal in male and female rats. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.03.560757. [PMID: 37873067 PMCID: PMC10592894 DOI: 10.1101/2023.10.03.560757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Alcohol use during adolescence coincides with elevated risks of stress-related impairment in adults, particularly via disrupted developmental trajectories of vulnerable corticolimbic and mesolimbic systems involved in fear processing. Prior work has investigated the impact of binge-like alcohol consumption on adult fear and stress, but less is known about whether voluntarily consumed alcohol imparts differential effects based on adolescence phases and biological sex. Here, adolescent male and female Long Evans rats were granted daily access to alcohol (15%) during either early (Early-EtOH; P25-45) or late adolescence (Late-EtOH; P45-55) using a modified drinking-in-the-dark design. Upon adulthood (P75-80), rats were exposed to a three-context (ABC) fear renewal procedure. We found that male and female Early-EtOH rats showed faster acquisition of fear but less freezing during early phases of extinction and throughout fear renewal. In the extinction period specifically, Early-EtOH rats showed normal levels of freezing in the presence of fear-associated cues, but abnormally low freezing immediately after cue offset, suggesting a key disruption in contextual processing and/or novelty seeking brought by early adolescent binge consumption. While the effects of alcohol were most pronounced in the Early-EtOH rats (particularly in females), Late-EtOH rats displayed some changes in fear behavior including slower fear acquisition, faster extinction, and reduced renewal compared with controls, but primarily in males. Our results suggest that early adolescence in males and females and, to a lesser extent, late adolescence in males is a particularly vulnerable period wherein alcohol use can promote stress-related dysfunction in adulthood. Furthermore, our results provide multiple bases for future research focused on developmental correlates of alcohol mediated disruption in the brain.
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Affiliation(s)
- J Alex Grizzell
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
- Dept of Neuroscience and Behavioral Biology, Emory University, Atlanta GA 30322
| | - Maryam Vanbaelinghem
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
| | - Jessica Westerman
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
| | - Michael P Saddoris
- Dept Psychology & Neuroscience, University of Colorado Boulder, Boulder CO, 80301
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4
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Antonoudiou P, Stone B, Colmers PLW, Evans-Strong A, Walton N, Maguire J. Influence of chronic stress on network states governing valence processing: Potential relevance to the risk for psychiatric illnesses. J Neuroendocrinol 2023; 35:e13274. [PMID: 37186481 PMCID: PMC11025365 DOI: 10.1111/jne.13274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 03/23/2023] [Accepted: 03/29/2023] [Indexed: 05/17/2023]
Abstract
Stress is a major risk factor for psychiatric illnesses and understanding the mechanisms through which stress disrupts behavioral states is imperative to understanding the underlying pathophysiology of mood disorders. Both chronic stress and early life stress alter valence processing, the process of assigning value to sensory inputs and experiences (positive or negative), which determines subsequent behavior and is essential for emotional processing and ultimately survival. Stress disrupts valence processing in both humans and preclinical models, favoring negative valence processing and impairing positive valence processing. Valence assignment involves neural computations performed in emotional processing hubs, including the amygdala, prefrontal cortex, and ventral hippocampus, which can be influenced by neuroendocrine mediators. Oscillations within and between these regions are critical for the neural computations necessary to perform valence processing functions. Major advances in the field have demonstrated a role for oscillatory states in valence processing under physiological conditions and emerging studies are exploring how these network states are altered under pathophysiological conditions and impacted by neuroendocrine factors. The current review highlights what is currently known regarding the impact of stress and the role of neuroendocrine mediators on network states and valence processing. Further, we propose a model in which chronic stress alters information routing through emotional processing hubs, resulting in a facilitation of negative valence processing and a suppression of positive valence processing.
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Affiliation(s)
| | - Bradly Stone
- Tufts University School of Medicine, Boston, Massachusetts, USA
| | | | | | - Najah Walton
- Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Jamie Maguire
- Tufts University School of Medicine, Boston, Massachusetts, USA
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5
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Ferrara NC, Opendak M. Amygdala circuit transitions supporting developmentally-appropriate social behavior. Neurobiol Learn Mem 2023; 201:107762. [PMID: 37116857 PMCID: PMC10204580 DOI: 10.1016/j.nlm.2023.107762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/30/2023] [Accepted: 04/22/2023] [Indexed: 04/30/2023]
Abstract
Social behaviors dynamically change throughout the lifespan alongside the maturation of neural circuits. The basolateral region of the amygdala (BLA), in particular, undergoes substantial maturational changes from birth throughout adolescence that are characterized by changes in excitation, inhibition, and dopaminergic modulation. In this review, we detail the trajectory through which BLA circuits mature and are influenced by dopaminergic systems to guide transitions in social behavior in infancy and adolescence using data from rodents. In early life, social behavior is oriented towards approaching the attachment figure, with minimal BLA involvement. Around weaning age, dopaminergic innervation of the BLA introduces avoidance of novel peers into rat pups' behavioral repertoire. In adolescence, social behavior transitions towards peer-peer interactions with a high incidence of social play-related behaviors. This transition coincides with an increasing role of the BLA in the regulation of social behavior. Adolescent BLA maturation can be characterized by an increasing integration and function of local inhibitory GABAergic circuits and their engagement by the medial prefrontal cortex (mPFC). Manipulation of these transitions using viral circuit dissection techniques and early adversity paradigms reveals the sensitivity of this system and its role in producing age-appropriate social behavior.
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Affiliation(s)
- Nicole C Ferrara
- Discipline of Physiology and Biophysics, Department of Foundational Sciences and Humanities, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA; Center for Neurobiology of Stress Resilience and Psychiatric Disorders, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Maya Opendak
- Kennedy Krieger Institute, Baltimore, MD, USA; Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Johns Hopkins Kavli Neuroscience Discovery Institute, Baltimore, MD, USA.
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6
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Bercum FM, Gomez MJN, Saddoris MP. Prefrontal cortex neurons in adult rats exposed to early life stress fail to appropriately signal the consequences of motivated actions. Physiol Behav 2023; 263:114107. [PMID: 36740134 PMCID: PMC10023442 DOI: 10.1016/j.physbeh.2023.114107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 01/12/2023] [Accepted: 02/01/2023] [Indexed: 02/05/2023]
Abstract
Early life stress (ELS) can set the stage for susceptibility to cognitive and emotional dysfunction in adulthood by disrupting typical neural development. The prefrontal cortex (PFC) continues to mature during early life, making this region particularly vulnerable to disruption for animals who experience ELS. Despite this, the effects of ELS experience on in vivo PFC function in awake and behaving adult animals are currently poorly understood. To assess this, we employed an instrumental conflict task to assess how hungry adult rats, either ELS (wet bedding) or unstressed Controls, were able to flexibly alter their motivation for food reward seeking (lever presses) in situations that were either threatening or safe. During this task, in vivo electrophysiological recordings (both single unit and local field potentials [LFPs]) were made in the rats' ventral-medial PFC (vmPFC). We found that ELS rats were less motivated to lever press for rewards than Controls in the threat situations during repeated extinction sessions. In recordings taken during this suppression task, Control vmPFC neurons displayed reliable differences between motivated actions, such as between rewarded and unrewarded presses, but ELS neurons failed to differentiate these action-outcome differences. We also found differences in task-related LFP activity between groups; in particular, prior ELS experience appears to induce abnormal changes in low-frequency oscillations during shock-associated threat stimuli prior to presses, as well as diminished higher-frequency oscillations following rewarded presses. Collectively, we demonstrate that ELS experience produces persistent impairment in motivational regulation that is associated with significant changes in in vivo PFC signals. Specifically, ELS-experienced adults fail to appropriately update motivated action strategies under threat conditions, and likewise fail to appropriately monitor and update action/outcome relationships in motivated behavior. These ELS-related changes may therefore lay the foundation for heightened susceptibility to mental-health disorders in adults such as substance abuse and post-traumatic stress disorder.
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Affiliation(s)
- Florencia M Bercum
- Department Psychology & Neuroscience, University of Colorado Boulder, 2860 Wilderness Place, Boulder, CO, 80301, USA
| | - Maria J Navarro Gomez
- Department Psychology & Neuroscience, University of Colorado Boulder, 2860 Wilderness Place, Boulder, CO, 80301, USA
| | - Michael P Saddoris
- Department Psychology & Neuroscience, University of Colorado Boulder, 2860 Wilderness Place, Boulder, CO, 80301, USA.
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7
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Karst H, Droogers WJ, van der Weerd N, Damsteegt R, van Kroonenburg N, Sarabdjitsingh RA, Joëls M. Acceleration of GABA-switch after early life stress changes mouse prefrontal glutamatergic transmission. Neuropharmacology 2023; 234:109543. [PMID: 37061088 DOI: 10.1016/j.neuropharm.2023.109543] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/06/2023] [Accepted: 04/09/2023] [Indexed: 04/17/2023]
Abstract
Early life stress (ELS) alters the excitation-inhibition-balance (EI-balance) in various rodent brain areas and may be responsible for behavioral impairment later in life. The EI-balance is (amongst others) influenced by the switch of GABAergic transmission from excitatory to inhibitory, the so-called "GABA-switch". Here, we investigated how ELS affects the GABA-switch in mouse infralimbic Prefrontal Cortex layer 2/3 neurons, using the limited-nesting-and-bedding model. In ELS mice, the GABA-switch occurred already between postnatal day (P) 6 and P9, as opposed to P15-P21 in controls. This was associated with increased expression of the inward chloride transporter NKCC1, compared to the outward chloride transporter KCC2, both of which are important for the intracellular chloride concentration and, hence, the GABA reversal potential (Erev). Chloride transporters are not only important for regulating chloride concentration postsynaptically, but also presynaptically. Depending on the Erev of GABA, presynaptic GABAA receptor stimulation causes a depolarization or hyperpolarization, and thereby enhanced or reduced fusion of glutamate vesicles respectively, in turn changing the frequency of miniature postsynaptic currents (mEPSCs). In accordance, bumetanide, a blocker of NKCC1, shifted the Erev GABA towards more hyperpolarized levels in P9 control mice and reduced the mEPSC frequency. Other modulators of chloride transporters, e.g. VU0463271 (a KCC2 antagonist) and aldosterone -which increases NKCC1 expression-did not affect postsynaptic Erev in ELS P9 mice, but did increase the mEPSC frequency. We conclude that the mouse GABA-switch is accelerated after ELS, affecting both the pre- and postsynaptic chloride homeostasis, the former altering glutamatergic transmission. This may considerably affect brain development.
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Affiliation(s)
- Henk Karst
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands.
| | - Wouter J Droogers
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Nelleke van der Weerd
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Ruth Damsteegt
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Nicky van Kroonenburg
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands
| | - R Angela Sarabdjitsingh
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Marian Joëls
- Dept Translational Neuroscience, University Medical Center Utrecht, Utrecht University, the Netherlands; University Medical Center Groningen, University of Groningen, the Netherlands
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8
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The lifetime impact of stress on fear regulation and cortical function. Neuropharmacology 2023; 224:109367. [PMID: 36464208 DOI: 10.1016/j.neuropharm.2022.109367] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 11/22/2022] [Accepted: 11/30/2022] [Indexed: 12/03/2022]
Abstract
A variety of stressful experiences can influence the ability to form and subsequently inhibit fear memory. While nonsocial stress can impact fear learning and memory throughout the lifespan, psychosocial stressors that involve negative social experiences or changes to the social environment have a disproportionately high impact during adolescence. Here, we review converging lines of evidence that suggest that development of prefrontal cortical circuitry necessary for both social experiences and fear learning is altered by stress exposure in a way that impacts both social and fear behaviors throughout the lifespan. Further, we suggest that psychosocial stress, through its impact on the prefrontal cortex, may be especially detrimental during early developmental periods characterized by higher sociability. This article is part of the Special Issue on 'Fear, Anxiety and PTSD'.
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Niedringhaus M, West EA. Prelimbic cortex neural encoding dynamically tracks expected outcome value. Physiol Behav 2022; 256:113938. [PMID: 35944659 DOI: 10.1016/j.physbeh.2022.113938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 11/24/2022]
Abstract
Animals must modify their behavior based on updated expected outcomes in a changing environment. Prelimbic cortex (PrL) neural encoding during learning predicts, and is necessary for, appropriately altering behavior based on a new expected outcome value following devaluation. We aimed to determine how PrL neural activity encodes reward predictive cues after the expected outcome value of those cues is decreased following conditioned taste aversion. In one post-devaluation session, rats were tested under extinction to determine their ability to alter their behavior to the expected outcome values (i.e., extinction test). In a second post-devaluation session, rats were tested with the newly devalued outcome delivered so that the rats experienced the updated outcome value within the session (i.e., re-exposure test). We found that PrL neural encoding of the cue associated with the devalued reward predicted the ability of rats to suppress behavior in the extinction test session, but not in the re-exposure test session. While all rats were able to successfully devalue the outcome during conditioned taste aversion, a subset of rats continued to consume the devalued outcome in the re-exposure test session. We found differential patterns of PrL neural encoding in the population of rats that did not avoid the devalued outcome during the re-exposure test compared to the rats that successfully avoided the devalued outcome. Our findings suggest that PrL neural encoding dynamically tracks expected outcome values, and differential neural encoding in the PrL to reward predictive cues following expected outcome value changes may contribute to distinct behavioral phenotypes.
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Affiliation(s)
- Mark Niedringhaus
- Cell Biology and Neuroscience, Rowan University School of Osteopathic Medicine, Stratford, NJ, 08084
| | - Elizabeth A West
- Cell Biology and Neuroscience, Rowan University School of Osteopathic Medicine, Stratford, NJ, 08084; Graduate School of Biomedical Sciences, Rowan University School of Osteopathic Medicine, Stratford, NJ, 08084.
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Todd TP, Leaton RN, Helmstetter FJ. Introduction to the Special Issue to Commemorate the Scientific Legacy of David J. Bucci. Neurobiol Learn Mem 2022; 190:107612. [DOI: 10.1016/j.nlm.2022.107612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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