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Sequeira MK, Stachowicz KM, Seo EH, Yount ST, Gourley SL. Cocaine disrupts action flexibility via glucocorticoid receptors. iScience 2024; 27:110148. [PMID: 38989467 PMCID: PMC11233908 DOI: 10.1016/j.isci.2024.110148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 03/22/2024] [Accepted: 05/27/2024] [Indexed: 07/12/2024] Open
Abstract
Many addictive drugs increase stress hormone levels. They also alter the propensity of organisms to prospectively select actions based on long-term consequences. We hypothesized that cocaine causes inflexible action by increasing circulating stress hormone levels, activating the glucocorticoid receptor (GR). We trained mice to generate two nose pokes for food and then required them to update action-consequence associations when one response was no longer reinforced. Cocaine delivered in adolescence or adulthood impaired the capacity of mice to update action strategies, and inhibiting CORT synthesis rescued action flexibility. Next, we reduced Nr3c1, encoding GR, in the orbitofrontal cortex (OFC), a region of the brain responsible for interlacing new information into established routines. Nr3c1 silencing preserved action flexibility and dendritic spine abundance on excitatory neurons, despite cocaine. Spines are often considered substrates for learning and memory, leading to the discovery that cocaine degrades the representation of new action memories, obstructing action flexibility.
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Affiliation(s)
- Michelle K Sequeira
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, USA
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Departments of Pediatrics and Psychiatry and Behavioral Sciences, Emory University School of Medicine, Emory University, Atlanta, GA, USA
| | - Kathryn M Stachowicz
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Departments of Pediatrics and Psychiatry and Behavioral Sciences, Emory University School of Medicine, Emory University, Atlanta, GA, USA
| | - Esther H Seo
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Departments of Pediatrics and Psychiatry and Behavioral Sciences, Emory University School of Medicine, Emory University, Atlanta, GA, USA
| | - Sophie T Yount
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Departments of Pediatrics and Psychiatry and Behavioral Sciences, Emory University School of Medicine, Emory University, Atlanta, GA, USA
- Graduate Program in Molecular and Systems Pharmacology, Emory University, Atlanta, GA, USA
| | - Shannon L Gourley
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, USA
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Departments of Pediatrics and Psychiatry and Behavioral Sciences, Emory University School of Medicine, Emory University, Atlanta, GA, USA
- Graduate Program in Molecular and Systems Pharmacology, Emory University, Atlanta, GA, USA
- Children's Healthcare of Atlanta, Atlanta, GA, USA
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2
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Mottarlini F, Targa G, Rizzi B, Fumagalli F, Caffino L. Developmental activity-based anorexia alters hippocampal non-genomic stress response and induces structural instability and spatial memory impairment in female rats. Prog Neuropsychopharmacol Biol Psychiatry 2024; 134:111065. [PMID: 38901757 DOI: 10.1016/j.pnpbp.2024.111065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 05/18/2024] [Accepted: 06/17/2024] [Indexed: 06/22/2024]
Abstract
OBJECTIVE Anorexia nervosa (AN) is characterized by hyperactivation of the hypothalamic-pituitary-adrenal axis and cognitive deficits. However, little is known about the rapid non-genomic stress response involvement. This study investigates the molecular, structural and behavioral signatures of the anorexic phenotype induction in female rats on stress-related mechanisms in the hippocampus. METHOD Female adolescent rats, exposed to the combination of food restriction and wheel access, i.e., the activity-based anorexia (ABA) protocol, were sacrificed in the acute phase of the pathology (postnatal day [P]42) or following a 7-day recovery period (P49). RESULTS ABA rats, in addition to body weight loss and increased wheel activity, alter their pattern of activity over days, showing increased food anticipatory activity, a readout of their motivation to engage in intense physical activity. Corticosterone plasma levels were enhanced at P42 while reduced at P49 in ABA rats. In the membrane fraction of the hippocampus, we found reduced glucocorticoid receptor levels together with reduced expression of caldesmon, n-cadherin and neuroligin-1, molecular markers of cytoskeletal stability and glutamatergic homeostasis. Accordingly, structural analyses revealed reduced dendritic spine density, a reduced number of mushroom-shaped spines, together with an increased number of thin-shaped spines. These events are paralleled by impairment in spatial memory measured in the spatial order object recognition test. These effects persisted even when body weight of ABA rats was restored. DISCUSSION Our findings indicate that ABA induction orchestrates hippocampal maladaptive structural and functional plasticity, contributing to cognitive deficits, providing a putative mechanism that could be targeted in AN patients.
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Affiliation(s)
- Francesca Mottarlini
- Department of Pharmacological and Biomolecular Sciences 'Rodolfo Paoletti', Università degli Studi di Milano, Via Balzaretti 9, 20133 Milano, Italy
| | - Giorgia Targa
- Department of Pharmacological and Biomolecular Sciences 'Rodolfo Paoletti', Università degli Studi di Milano, Via Balzaretti 9, 20133 Milano, Italy
| | - Beatrice Rizzi
- Department of Pharmacological and Biomolecular Sciences 'Rodolfo Paoletti', Università degli Studi di Milano, Via Balzaretti 9, 20133 Milano, Italy; Center for Neuroscience, University of Camerino, Camerino, Italy
| | - Fabio Fumagalli
- Department of Pharmacological and Biomolecular Sciences 'Rodolfo Paoletti', Università degli Studi di Milano, Via Balzaretti 9, 20133 Milano, Italy
| | - Lucia Caffino
- Department of Pharmacological and Biomolecular Sciences 'Rodolfo Paoletti', Università degli Studi di Milano, Via Balzaretti 9, 20133 Milano, Italy.
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3
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Li DC, Hinton EA, Guo J, Knight KA, Sequeira MK, Wynne ME, Dighe NM, Gourley SL. Social experience in adolescence shapes prefrontal cortex structure and function in adulthood. Mol Psychiatry 2024:10.1038/s41380-024-02540-6. [PMID: 38580810 DOI: 10.1038/s41380-024-02540-6] [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: 03/15/2024] [Accepted: 03/18/2024] [Indexed: 04/07/2024]
Abstract
During adolescence, the prefrontal cortex (PFC) undergoes dramatic reorganization. PFC development is profoundly influenced by the social environment, disruptions to which may prime the emergence of psychopathology across the lifespan. We investigated the neurobehavioral consequences of isolation experienced in adolescence in mice, and in particular, the long-term consequences that were detectable even despite normalization of the social milieu. Isolation produced biases toward habit-like behavior at the expense of flexible goal seeking, plus anhedonic-like reward deficits. Behavioral phenomena were accompanied by neuronal dendritic spine over-abundance and hyper-excitability in the ventromedial PFC (vmPFC), which was necessary for the expression of isolation-induced habits and sufficient to trigger behavioral inflexibility in socially reared controls. Isolation activated cytoskeletal regulatory pathways otherwise suppressed during adolescence, such that repression of constituent elements prevented long-term isolation-induced neurosequelae. Altogether, our findings unveil an adolescent critical period and multi-model mechanism by which social experiences facilitate prefrontal cortical maturation.
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Affiliation(s)
- Dan C Li
- Medical Scientist Training Program, Emory University School of Medicine, Atlanta, GA, USA.
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA.
| | - Elizabeth A Hinton
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
| | - Jidong Guo
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Department of Psychiatry and Behavioral sciences, Emory University School of Medicine, Atlanta, GA, USA
| | | | - Michelle K Sequeira
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
| | - Meghan E Wynne
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
| | - Niharika M Dighe
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
| | - Shannon L Gourley
- Emory National Primate Research Center, Emory University, Atlanta, GA, USA.
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA.
- Department of Psychiatry and Behavioral sciences, Emory University School of Medicine, Atlanta, GA, USA.
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4
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Fraga DB, Camargo A, Olescowicz G, Padilha DA, Mina F, Budni J, Brocardo PS, Rodrigues ALS. Ketamine, but not fluoxetine, rapidly rescues corticosterone-induced impairments on glucocorticoid receptor and dendritic branching in the hippocampus of mice. Metab Brain Dis 2021; 36:2223-2233. [PMID: 33950381 DOI: 10.1007/s11011-021-00743-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 04/22/2021] [Indexed: 12/19/2022]
Abstract
Although numerous studies have investigated the mechanisms underlying the fast and sustained antidepressant-like effects of ketamine, the contribution of the glucocorticoid receptor (GR) and dendritic branching remodeling to its responses remain to be fully established. This study investigated the ability of a single administration of ketamine to modulate the GR and dendritic branching remodeling and complexity in the hippocampus of mice subjected to chronic corticosterone (CORT) administration. CORT was administered for 21 days, followed by a single administration of ketamine (1 mg ∕kg, i.p.) or fluoxetine (10 mg ∕kg, p.o., conventional antidepressant) in mice. On 22nd, 24 h after the treatments, GR immunocontent in the hippocampus was analyzed by western blotting, while the dendritic arborization and dendrite length in the ventral and dorsal dentate gyrus (DG) of the hippocampus was analyzed by Sholl analysis. Chronic CORT administration downregulated hippocampal GR immunocontent, but this alteration was completely reversed by a single administration of ketamine, but not fluoxetine. Moreover, CORT administration significantly decreased dendritic branching in the dorsal and ventral DG areas and caused a mild decrease in dendrite length in both regions. Ketamine, but not fluoxetine, reversed CORT-induced dendritic branching loss in the ventral and dorsal DG areas, regions associated with mood regulation and cognitive functions, respectively. This study provides novel evidence that a single administration of ketamine, but not fluoxetine, rescued the impairments on GR and dendritic branching in the hippocampus of mice subjected to chronic CORT administration, effects that may be associated with its rapid antidepressant response.
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Affiliation(s)
- Daiane B Fraga
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Anderson Camargo
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Gislaine Olescowicz
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Dayane Azevedo Padilha
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Francielle Mina
- Laboratory of Experimental Neurology, Graduate Program in Health Sciences, University of Southern Santa Catarina, Criciúma, SC, Brazil
| | - Josiane Budni
- Laboratory of Experimental Neurology, Graduate Program in Health Sciences, University of Southern Santa Catarina, Criciúma, SC, Brazil
| | - Patricia S Brocardo
- Department of Morphological Sciences, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Ana Lúcia S Rodrigues
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
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Caffino L, Mottarlini F, Zita G, Gawliński D, Gawlińska K, Wydra K, Przegaliński E, Fumagalli F. The effects of cocaine exposure in adolescence: Behavioural effects and neuroplastic mechanisms in experimental models. Br J Pharmacol 2021; 179:4233-4253. [PMID: 33963539 PMCID: PMC9545182 DOI: 10.1111/bph.15523] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 04/15/2021] [Accepted: 05/04/2021] [Indexed: 01/23/2023] Open
Abstract
Drug addiction is a devastating disorder with a huge economic and social burden for modern society. Although an individual may slip into drug abuse throughout his/her life, adolescents are at higher risk, but, so far, only a few studies have attempted to elucidate the underlying cellular and molecular bases of such vulnerability. Indeed, preclinical evidence indicates that psychostimulants and adolescence interact and contribute to promoting a dysfunctional brain. In this review, we have focused our attention primarily on changes in neuroplasticity brought about by cocaine, taking into account that there is much less evidence from exposure to cocaine in adolescence, compared with that from adults. This review clearly shows that exposure to cocaine during adolescence, acute or chronic, as well as contingent or non‐contingent, confers a vulnerable endophenotype, primarily, by causing changes in neuroplasticity. Given the close relationship between drug abuse and psychiatric disorders, we also discuss the translational implications providing an interpretative framework for clinical studies involving addictive as well as affective or psychotic behaviours.
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Affiliation(s)
- Lucia Caffino
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Francesca Mottarlini
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Gianmaria Zita
- Dipartimento di Salute Mentale e Dipendenze, ASST Fatebenefratelli-Sacco, Milan, Italy
| | - Dawid Gawliński
- Department of Drug Addiction Pharmacology, Maj Institute of Pharmacology Polish Academy of Sciences, Kraków, Poland
| | - Kinga Gawlińska
- Department of Drug Addiction Pharmacology, Maj Institute of Pharmacology Polish Academy of Sciences, Kraków, Poland
| | - Karolina Wydra
- Department of Drug Addiction Pharmacology, Maj Institute of Pharmacology Polish Academy of Sciences, Kraków, Poland
| | - Edmund Przegaliński
- Department of Drug Addiction Pharmacology, Maj Institute of Pharmacology Polish Academy of Sciences, Kraków, Poland
| | - Fabio Fumagalli
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
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HUZARD D, RAPPENEAU V, MEIJER OC, TOUMA C, ARANGO-LIEVANO M, GARABEDIAN MJ, JEANNETEAU F. Experience and activity-dependent control of glucocorticoid receptors during the stress response in large-scale brain networks. Stress 2021; 24:130-153. [PMID: 32755268 PMCID: PMC7907260 DOI: 10.1080/10253890.2020.1806226] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The diversity of actions of the glucocorticoid stress hormones among individuals and within organs, tissues and cells is shaped by age, gender, genetics, metabolism, and the quantity of exposure. However, such factors cannot explain the heterogeneity of responses in the brain within cells of the same lineage, or similar tissue environment, or in the same individual. Here, we argue that the stress response is continuously updated by synchronized neural activity on large-scale brain networks. This occurs at the molecular, cellular and behavioral levels by crosstalk communication between activity-dependent and glucocorticoid signaling pathways, which updates the diversity of responses based on prior experience. Such a Bayesian process determines adaptation to the demands of the body and external world. We propose a framework for understanding how the diversity of glucocorticoid actions throughout brain networks is essential for supporting optimal health, while its disruption may contribute to the pathophysiology of stress-related disorders, such as major depression, and resistance to therapeutic treatments.
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Affiliation(s)
- Damien HUZARD
- Department of Neuroscience and Physiology, University of Montpellier, CNRS, INSERM, Institut de Génomique Fonctionnelle, Montpellier, France
| | - Virginie RAPPENEAU
- Department of Behavioural Biology, University of Osnabrück, Osnabrück, Germany
| | - Onno C. MEIJER
- Division of Endocrinology, Department of Internal Medicine, Leiden University Medical Center, Leiden University, Leiden, the Netherlands
| | - Chadi TOUMA
- Department of Behavioural Biology, University of Osnabrück, Osnabrück, Germany
| | - Margarita ARANGO-LIEVANO
- Department of Neuroscience and Physiology, University of Montpellier, CNRS, INSERM, Institut de Génomique Fonctionnelle, Montpellier, France
| | | | - Freddy JEANNETEAU
- Department of Neuroscience and Physiology, University of Montpellier, CNRS, INSERM, Institut de Génomique Fonctionnelle, Montpellier, France
- Corresponding author:
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7
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Barfield ET, Sequeira MK, Parsons RG, Gourley SL. Morphological Responses of Excitatory Prelimbic and Orbitofrontal Cortical Neurons to Excess Corticosterone in Adolescence and Acute Stress in Adulthood. Front Neuroanat 2020; 14:45. [PMID: 33013327 PMCID: PMC7506158 DOI: 10.3389/fnana.2020.00045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 07/03/2020] [Indexed: 12/23/2022] Open
Abstract
Considerable evidence indicates that chronic stress and excess glucocorticoids induce neuronal remodeling in prefrontal cortical (PFC) regions. Adolescence is also characterized by a structural reorganization of PFC neurons, yet interactions between stress- and age-related structural plasticity are still being determined. We quantified dendritic spine densities on apical dendrites of excitatory neurons in the medial prefrontal cortex, prelimbic subregion (PL). Densities decreased across adolescent development, as expected, and spine volume increased. Unexpectedly, exposure to excess corticosterone (CORT) throughout adolescence did not cause additional dendritic spine loss detectable in adulthood. As a positive control dendrite population expected to be sensitive to CORT, we imaged neurons in the orbitofrontal cortex (OFC), confirming CORT-induced dendritic spine attrition on basal arbors of layer V neurons. We next assessed the effects of acute, mild stress in adulthood: On PL neurons, an acute stressor increased the density of mature, mushroom-shaped spines. Meanwhile, on OFC neurons, dendritic spine volumes and lengths were lower in mice exposed to both CORT and an acute stressor (also referred to as a "double hit"). In sum, prolonged exposure to excess glucocorticoids during adolescence can have morphological and also metaplastic consequences, but they are not global. Anatomical considerations are discussed.
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Affiliation(s)
- Elizabeth T. Barfield
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, Yerkes National Primate Research Center, Emory University, Atlanta, GA, United States
| | - Michelle K. Sequeira
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, Yerkes National Primate Research Center, Emory University, Atlanta, GA, United States
- Graduate Training Programs in Neuroscience, Emory University, Atlanta, GA, United States
| | - Ryan G. Parsons
- Graduate Program in Integrative Neuroscience, Department of Psychology, Stony Brook University, Stony Brook, NY, United States
| | - Shannon L. Gourley
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, Yerkes National Primate Research Center, Emory University, Atlanta, GA, United States
- Graduate Training Programs in Neuroscience, Emory University, Atlanta, GA, United States
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8
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Effects of stress on the structure and function of the medial prefrontal cortex: Insights from animal models. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2019; 150:129-153. [PMID: 32204829 DOI: 10.1016/bs.irn.2019.11.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Stress alters both cognitive and emotional function, and increases risk for a variety of psychological disorders, such as depression and posttraumatic stress disorder. The prefrontal cortex is critical for executive function and emotion regulation, is a target for stress hormones, and is implicated in many stress-influenced psychological disorders. Therefore, understanding how stress-induced changes in the structure and function of the prefrontal cortex are related to stress-induced changes in behavior may elucidate some of the mechanisms contributing to stress-sensitive disorders. This review focuses on data from rodent models to describe the effects of chronic stress on behaviors mediated by the medial prefrontal cortex, the effects of chronic stress on the morphology and physiology of the medial prefrontal cortex, mechanisms that may mediate these effects, and evidence for sex differences in the effects of stress on the prefrontal cortex. Understanding how stress influences prefrontal cortex and behaviors mediated by it, as well as sex differences in this effect, will elucidate potential avenues for novel interventions for stress-sensitive disorders characterized by deficits in executive function and emotion regulation.
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9
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Hinton EA, Li DC, Allen AG, Gourley SL. Social Isolation in Adolescence Disrupts Cortical Development and Goal-Dependent Decision-Making in Adulthood, Despite Social Reintegration. eNeuro 2019; 6:ENEURO.0318-19.2019. [PMID: 31527057 PMCID: PMC6757188 DOI: 10.1523/eneuro.0318-19.2019] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 08/19/2019] [Indexed: 12/18/2022] Open
Abstract
The social environment influences neurodevelopment. Investigations using rodents to study this phenomenon commonly isolate subjects, then assess neurobehavioral consequences while animals are still isolated. This approach precludes one from dissociating the effects of on-going versus prior isolation, hindering our complete understanding of the consequences of social experience during particular developmental periods. Here, we socially isolated adolescent mice from postnatal day (P)31 to P60, then re-housed them into social groups. We tested their ability to select actions based on expected outcomes using multiple reinforcer devaluation and instrumental contingency degradation techniques. Social isolation in adolescence (but not adulthood) weakened instrumental response updating, causing mice to defer to habit-like behaviors. Habit biases were associated with glucocorticoid insufficiency in adolescence, oligodendrocyte marker loss throughout cortico-striatal regions, and dendritic spine and synaptic marker excess in the adult orbitofrontal cortex (OFC). Artificial, chemogenetic stimulation of the ventrolateral OFC in typical, healthy mice recapitulated response biases following isolation, causing habit-like behaviors. Meanwhile, correcting dendritic architecture by inhibiting the cytoskeletal regulatory protein ROCK remedied instrumental response updating defects in socially isolated mice. Our findings suggest that adolescence is a critical period during which social experience optimizes one's ability to seek and attain goals later in life. Age-typical dendritic spine elimination appears to be an essential factor, and in its absence, organisms may defer to habit-based behaviors.
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Affiliation(s)
- Elizabeth A Hinton
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, 30329
- Center for Translational and Social Neuroscience, Emory University, Atlanta, GA, 30329
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, 30329
- Department of Pediatrics, Emory University, Atlanta, GA, 30329
- Department of Psychiatry, Emory University, Atlanta, GA, 30329
| | - Dan C Li
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, 30329
- Center for Translational and Social Neuroscience, Emory University, Atlanta, GA, 30329
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, 30329
- Department of Pediatrics, Emory University, Atlanta, GA, 30329
- Department of Psychiatry, Emory University, Atlanta, GA, 30329
| | - Aylet G Allen
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, 30329
- Department of Pediatrics, Emory University, Atlanta, GA, 30329
| | - Shannon L Gourley
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, 30329
- Center for Translational and Social Neuroscience, Emory University, Atlanta, GA, 30329
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, 30329
- Department of Pediatrics, Emory University, Atlanta, GA, 30329
- Department of Psychiatry, Emory University, Atlanta, GA, 30329
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10
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Gianessi CA, Groman SM, Taylor JR. Bi-directional modulation of food habit expression by the endocannabinoid system. Eur J Neurosci 2019; 49:1610-1622. [PMID: 30589475 DOI: 10.1111/ejn.14330] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 12/03/2018] [Accepted: 12/14/2018] [Indexed: 12/22/2022]
Abstract
The compulsive, habitual behaviors that have been observed in individuals diagnosed with substance use disorders may be due to disruptions in the neural circuits that mediate goal-directed actions. The endocannabinoid system has been shown to play a critical role in habit learning, but the role of this neuromodulatory system in habit expression is unclear. Here, we investigated the role of the endocannabinoid system in established habitual actions using contingency degradation in male C57BL/6 mice. We found that administration of the endocannabinoid transport inhibitor AM404 reduced habitual responding for food and that antagonism of cannabinoid receptor type 1 (CB1), but not transient receptor potential cation subfamily V (TRPV1), receptors produced a similar reduction in habitual responding. Moreover, pharmacological stimulation of CB1 receptors increased habitual responding for food. Co-administration of an enzyme inhibitor that selectively increases the endocannabinoid 2-arachidonoyl glycerol (2-AG) with AM404 partially restored habitual responding for food. Together, these findings demonstrate an important role for the endocannabinoid system in the expression of habits and provide novel insights into potential pharmacological strategies for reducing habitual behaviors in mental disorders.
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Affiliation(s)
- Carol A Gianessi
- Department of Psychiatry, Division of Molecular Psychiatry, Yale University School of Medicine, New Haven, Connecticut.,Interdepartmental Neuroscience Program, Yale University Graduate School of Arts and Sciences, New Haven, Connecticut
| | - Stephanie M Groman
- Department of Psychiatry, Division of Molecular Psychiatry, Yale University School of Medicine, New Haven, Connecticut
| | - Jane R Taylor
- Department of Psychiatry, Division of Molecular Psychiatry, Yale University School of Medicine, New Haven, Connecticut.,Interdepartmental Neuroscience Program, Yale University Graduate School of Arts and Sciences, New Haven, Connecticut.,Department of Psychology, Yale University, New Haven, Connecticut
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11
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Wellman CL, Moench KM. Preclinical studies of stress, extinction, and prefrontal cortex: intriguing leads and pressing questions. Psychopharmacology (Berl) 2019; 236:59-72. [PMID: 30225660 PMCID: PMC6374178 DOI: 10.1007/s00213-018-5023-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 09/03/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND Stress is associated with cognitive and emotional dysfunction, and increases risk for a variety of psychological disorders, including depression and posttraumatic stress disorder. Prefrontal cortex is critical for executive function and emotion regulation, is a target for stress hormones, and is implicated in many stress-influenced psychological disorders. Extinction of conditioned fear provides an excellent model system for examining how stress-induced changes in corticolimbic structure and function are related to stress-induced changes in neural function and behavior, as the neural circuitry underlying this behavior is well characterized. OBJECTIVES This review examines how acute and chronic stress influences extinction and describes how stress alters the structure and function of the medial prefrontal cortex, a potential neural substrate for these effects. In addition, we identify important unanswered questions about how stress-induced change in prefrontal cortex may mediate extinction deficits and avenues for future research. KEY FINDINGS A substantial body of work demonstrates deficits in extinction after either acute or chronic stress. A separate and substantial literature demonstrates stress-induced neuronal remodeling in medial prefrontal cortex, along with several key neurohormonal contributors to this remodeling, and there is substantial overlap in prefrontal mechanisms underlying extinction and the mechanisms implicated in stress-induced dysfunction of-and neuronal remodeling in-medial prefrontal cortex. However, data directly examining the contribution of changes in prefrontal structure and function to stress-induced extinction deficits is currently lacking. CONCLUSIONS Understanding how stress influences extinction and its neural substrates as well as individual differences in this effect will elucidate potential avenues for novel interventions for stress-sensitive disorders characterized by deficits in extinction.
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Affiliation(s)
- Cara L. Wellman
- Department of Psychological & Brain Sciences, Indiana University,Department of Psychological, Center for the Integrative Study of Animal Behavior, Indiana University,Department of Psychological, Program in Neuroscience, Indiana University
| | - Kelly M. Moench
- Department of Psychological & Brain Sciences, Indiana University,Department of Psychological, Center for the Integrative Study of Animal Behavior, Indiana University,Department of Psychological, Program in Neuroscience, Indiana University
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12
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Barfield ET, Gourley SL. Prefrontal cortical trkB, glucocorticoids, and their interactions in stress and developmental contexts. Neurosci Biobehav Rev 2018; 95:535-558. [PMID: 30477984 PMCID: PMC6392187 DOI: 10.1016/j.neubiorev.2018.10.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 09/14/2018] [Accepted: 10/23/2018] [Indexed: 02/07/2023]
Abstract
The tropomyosin/tyrosine receptor kinase B (trkB) and glucocorticoid receptor (GR) regulate neuron structure and function and the hormonal stress response. Meanwhile, disruption of trkB and GR activity (e.g., by chronic stress) can perturb neuronal morphology in cortico-limbic regions implicated in stressor-related illnesses like depression. Further, several of the short- and long-term neurobehavioral consequences of stress depend on the developmental timing and context of stressor exposure. We review how the levels and activities of trkB and GR in the prefrontal cortex (PFC) change during development, interact, are modulated by stress, and are implicated in depression. We review evidence that trkB- and GR-mediated signaling events impact the density and morphology of dendritic spines, the primary sites of excitatory synapses in the brain, highlighting effects in adolescents when possible. Finally, we review the role of neurotrophin and glucocorticoid systems in stress-related metaplasticity. We argue that better understanding the long-term effects of developmental stressors on PFC trkB, GR, and related factors may yield insights into risk for chronic, remitting depression and related neuropsychiatric illnesses.
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Affiliation(s)
- Elizabeth T Barfield
- Department of Pediatrics, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Graduate Program in Neuroscience, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Yerkes National Primate Research Center, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Department of Psychiatry and Behavioral Sciences, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA.
| | - Shannon L Gourley
- Department of Pediatrics, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Graduate Program in Neuroscience, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Yerkes National Primate Research Center, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Department of Psychiatry and Behavioral Sciences, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA; Molecular and Systems Pharmacology Program, Emory University, 954 Gatewood Rd. NE, Atlanta, GA, 30329, USA.
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13
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The Stress-Induced Transcription Factor NR4A1 Adjusts Mitochondrial Function and Synapse Number in Prefrontal Cortex. J Neurosci 2018; 38:1335-1350. [PMID: 29295823 PMCID: PMC5815341 DOI: 10.1523/jneurosci.2793-17.2017] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 11/10/2017] [Accepted: 12/08/2017] [Indexed: 12/28/2022] Open
Abstract
The energetic costs of behavioral chronic stress are unlikely to be sustainable without neuronal plasticity. Mitochondria have the capacity to handle synaptic activity up to a limit before energetic depletion occurs. Protective mechanisms driven by the induction of neuronal genes likely evolved to buffer the consequences of chronic stress on excitatory neurons in prefrontal cortex (PFC), as this circuitry is vulnerable to excitotoxic insults. Little is known about the genes involved in mitochondrial adaptation to the buildup of chronic stress. Using combinations of genetic manipulations and stress for analyzing structural, transcriptional, mitochondrial, and behavioral outcomes, we characterized NR4A1 as a stress-inducible modifier of mitochondrial energetic competence and dendritic spine number in PFC. NR4A1 acted as a transcription factor for changing the expression of target genes previously involved in mitochondrial uncoupling, AMP-activated protein kinase activation, and synaptic growth. Maintenance of NR4A1 activity by chronic stress played a critical role in the regressive synaptic organization in PFC of mouse models of stress (male only). Knockdown, dominant-negative approach, and knockout of Nr4a1 in mice and rats (male only) protected pyramidal neurons against the adverse effects of chronic stress. In human PFC tissues of men and women, high levels of the transcriptionally active NR4A1 correlated with measures of synaptic loss and cognitive impairment. In the context of chronic stress, prolonged expression and activity of NR4A1 may lead to responses of mitochondria and synaptic connectivity that do not match environmental demand, resulting in circuit malfunction between PFC and other brain regions, constituting a pathological feature across disorders. SIGNIFICANCE STATEMENT The bioenergetic cost of chronic stress is too high to be sustainable by pyramidal prefrontal neurons. Cellular checkpoints have evolved to adjust the responses of mitochondria and synapses to the buildup of chronic stress. NR4A1 plays such a role by controlling the energetic competence of mitochondria with respect to synapse number. As an immediate-early gene, Nr4a1 promotes neuronal plasticity, but sustained expression or activity can be detrimental. NR4A1 expression and activity is sustained by chronic stress in animal models and in human studies of neuropathologies sensitive to the buildup of chronic stress. Therefore, antagonism of NR4A1 is a promising avenue for preventing the regressive synaptic reorganization in cortical systems in the context of chronic stress.
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14
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Swanson AM, DePoy LM, Gourley SL. Inhibiting Rho kinase promotes goal-directed decision making and blocks habitual responding for cocaine. Nat Commun 2017; 8:1861. [PMID: 29187752 PMCID: PMC5707361 DOI: 10.1038/s41467-017-01915-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Accepted: 10/25/2017] [Indexed: 01/04/2023] Open
Abstract
The prelimbic prefrontal cortex is necessary for associating actions with their consequences, enabling goal-directed decision making. We find that the strength of action–outcome conditioning correlates with dendritic spine density in prelimbic cortex, suggesting that new action–outcome learning involves dendritic spine plasticity. To test this, we inhibited the cytoskeletal regulatory factor Rho kinase. We find that the inhibitor fasudil enhances action–outcome memory, resulting in goal-directed behavior in mice that would otherwise express stimulus-response habits. Fasudil transiently reduces prelimbic cortical dendritic spine densities during a period of presumed memory consolidation, but only when paired with new learning. Fasudil also blocks habitual responding for cocaine, an effect that persists over time, across multiple contexts, and depends on actin polymerization. We suggest that Rho kinase inhibition promotes goal-oriented action selection by augmenting the plasticity of prelimbic cortical dendritic spines during the formation of new action–outcome memories. Action-outcome learning requires the prelimbic prefrontal cortex. Here the authors report that fasudil, a Rho kinase inhibitor, reduces dendritic spine densities on prelimbic neurons in an activity-dependent manner, stimulating goal-directed actions, and reducing habitual responding for cocaine.
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Affiliation(s)
- Andrew M Swanson
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, 954 Gatewood Road NE, Atlanta, GA, 30329, USA.,Yerkes National Primate Research Center, Graduate Program in Neuroscience, Emory University, 954 Gatewood Road NE, Atlanta, GA, 30329, USA
| | - Lauren M DePoy
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, 954 Gatewood Road NE, Atlanta, GA, 30329, USA.,Yerkes National Primate Research Center, Graduate Program in Neuroscience, Emory University, 954 Gatewood Road NE, Atlanta, GA, 30329, USA
| | - Shannon L Gourley
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, 954 Gatewood Road NE, Atlanta, GA, 30329, USA. .,Yerkes National Primate Research Center, Graduate Program in Neuroscience, Emory University, 954 Gatewood Road NE, Atlanta, GA, 30329, USA.
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15
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Barfield ET, Gerber KJ, Zimmermann KS, Ressler KJ, Parsons RG, Gourley SL. Regulation of actions and habits by ventral hippocampal trkB and adolescent corticosteroid exposure. PLoS Biol 2017; 15:e2003000. [PMID: 29186135 PMCID: PMC5724896 DOI: 10.1371/journal.pbio.2003000] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 12/11/2017] [Accepted: 11/07/2017] [Indexed: 12/24/2022] Open
Abstract
In humans and rodents, stress promotes habit-based behaviors that can interfere with action-outcome decision-making. Further, developmental stressor exposure confers long-term habit biases across rodent-primate species. Despite these homologies, mechanisms remain unclear. We first report that exposure to the primary glucocorticoid corticosterone (CORT) in adolescent mice recapitulates multiple neurobehavioral consequences of stressor exposure, including long-lasting biases towards habit-based responding in a food-reinforced operant conditioning task. In both adolescents and adults, CORT also caused a shift in the balance between full-length tyrosine kinase receptor B (trkB) and a truncated form of this neurotrophin receptor, favoring the inactive form throughout multiple corticolimbic brain regions. In adolescents, phosphorylation of the trkB substrate extracellular signal-regulated kinase 42/44 (ERK42/44) in the ventral hippocampus was also diminished, a long-term effect that persisted for at least 12 wk. Administration of the trkB agonist 7,8-dihydroxyflavone (7,8-DHF) during adolescence at doses that stimulated ERK42/44 corrected long-lasting corticosterone-induced behavioral abnormalities. Meanwhile, viral-mediated overexpression of truncated trkB in the ventral hippocampus reduced local ERK42/44 phosphorylation and was sufficient to induce habit-based and depression-like behaviors. Together, our findings indicate that ventral hippocampal trkB is essential to goal-directed action selection, countering habit-based behavior otherwise facilitated by developmental stress hormone exposure. They also reveal an early-life sensitive period during which trkB-ERK42/44 tone determines long-term behavioral outcomes.
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Affiliation(s)
- Elizabeth T. Barfield
- Department of Pediatrics, Emory University, Atlanta, Georgia, United States of America
- Graduate Program in Neuroscience, Emory University, Atlanta, Georgia, United States of America
- Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia, United States of America
| | - Kyle J. Gerber
- Graduate Program in Molecular and Systems Pharmacology, Emory University, Atlanta, Georgia, United States of America
| | - Kelsey S. Zimmermann
- Department of Pediatrics, Emory University, Atlanta, Georgia, United States of America
- Graduate Program in Neuroscience, Emory University, Atlanta, Georgia, United States of America
- Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia, United States of America
| | - Kerry J. Ressler
- Graduate Program in Neuroscience, Emory University, Atlanta, Georgia, United States of America
- Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia, United States of America
| | - Ryan G. Parsons
- Department of Psychology, Graduate Program in Integrative Neuroscience and Program in Neuroscience, Stony Brook University, Stony Brook, New York, United States of America
| | - Shannon L. Gourley
- Department of Pediatrics, Emory University, Atlanta, Georgia, United States of America
- Graduate Program in Neuroscience, Emory University, Atlanta, Georgia, United States of America
- Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia, United States of America
- Graduate Program in Molecular and Systems Pharmacology, Emory University, Atlanta, Georgia, United States of America
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16
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Barker JM, Bryant KG, Osborne JI, Chandler LJ. Age and Sex Interact to Mediate the Effects of Intermittent, High-Dose Ethanol Exposure on Behavioral Flexibility. Front Pharmacol 2017; 8:450. [PMID: 28736526 PMCID: PMC5500662 DOI: 10.3389/fphar.2017.00450] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 06/22/2017] [Indexed: 11/18/2022] Open
Abstract
Human alcoholics have been shown to have impaired cognitive control over actions and increased reliance on habitual response strategies. While it is unclear in humans whether these differences predate ethanol exposure or result from chronic drinking, data from animal studies suggest that ethanol acts to promote the development of inflexible behaviors. Here, we investigated how intermittent exposure to high doses of ethanol impacts the ability to flexibly regulate behavior in a habit model. As adolescence, may represent a period of increased drug taking and developmental vulnerability that may impact adult behavior, we compared the effects of high-dose ethanol exposure during adolescence to exposure during adulthood in male and female rats. Our findings indicated that the effects of intermittent, high-dose ethanol exposure on habitual behavior is mediated by age and sex such that ethanol exposure during adolescence promoted the use of habitual response strategies in adult females, but not males, and that the opposite pattern emerged following intermittent, high-dose ethanol exposure in adult rats.
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Affiliation(s)
- Jacqueline M. Barker
- Department of Neuroscience, Medical University of South Carolina, CharlestonSC, United States
| | | | | | - L. J. Chandler
- Department of Neuroscience, Medical University of South Carolina, CharlestonSC, United States
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17
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DePoy LM, Zimmermann KS, Marvar PJ, Gourley SL. Induction and Blockade of Adolescent Cocaine-Induced Habits. Biol Psychiatry 2017; 81:595-605. [PMID: 27871669 PMCID: PMC5359769 DOI: 10.1016/j.biopsych.2016.09.023] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 09/14/2016] [Accepted: 09/25/2016] [Indexed: 11/28/2022]
Abstract
BACKGROUND Cocaine use during adolescence increases vulnerability to drug dependence and decreases the likelihood that individuals will seek treatment as adults. Understanding how early-life cocaine exposure influences decision-making processes in adulthood is thus critically important. METHODS Adolescent or adult mice were exposed to subchronic cocaine, then behavioral sensitivity to changes in the predictive relationship between actions and their consequences was tested. Dendritic spines on the principal pyramidal neurons of the orbitofrontal prefrontal cortex (oPFC) were also imaged and enumerated. To determine whether cytoskeletal regulatory systems in the oPFC influenced decision-making strategies, we then inhibited the activity of Abl family and Rho kinases as well as NR2B-containing N-methyl-D-aspartate receptors. We also attempted to block the reinstatement of cocaine seeking in cocaine self-administering mice. RESULTS Adult mice with a history of subchronic cocaine exposure in adolescence engaged habit-based response strategies at the expense of goal-directed decision-making strategies and had fewer dendritic spines in the oPFC. Inhibition of the cytoskeletal regulatory Abl family kinases in the oPFC recapitulated these neurobehavioral deficiencies, whereas Rho kinase inhibition corrected response strategies. Additionally, the NR2B-selective N-methyl-D-aspartate receptor antagonists ifenprodil and CP-101,606 blocked cocaine-induced habits; this was dependent on Abl family signaling in the oPFC. Ifenprodil also mitigated cue-induced reinstatement of cocaine seeking in mice self-administering cocaine. CONCLUSIONS We suggest that adolescent cocaine exposure confers a bias toward habit-based behavior in adulthood via long-term cellular structural modifications in the oPFC. Treatments aimed at mitigating the durable consequences of early-life cocaine use may benefit from targeting cytoskeletal regulatory systems.
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Affiliation(s)
- Lauren M. DePoy
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine,Yerkes National Primate Research Center, Graduate Program in Neuroscience, Emory University
| | - Kelsey S. Zimmermann
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine,Yerkes National Primate Research Center, Graduate Program in Neuroscience, Emory University
| | - Paul J. Marvar
- Department of Pharmacology and Physiology, Department of Psychiatry and Behavioral Sciences, GW Institute for Neuroscience, The George Washington University
| | - Shannon L. Gourley
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine,Yerkes National Primate Research Center, Graduate Program in Neuroscience, Emory University,Contact: Shannon L. Gourley, PhD, Department of Pediatrics
- Graduate Program in Neuroscience, Yerkes National Primate Research Center, Emory University, 954 Gatewood Rd. NE, Atlanta GA 30329, 404-727-2482,
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18
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Zimmermann KS, Yamin JA, Rainnie DG, Ressler KJ, Gourley SL. Connections of the Mouse Orbitofrontal Cortex and Regulation of Goal-Directed Action Selection by Brain-Derived Neurotrophic Factor. Biol Psychiatry 2017; 81:366-377. [PMID: 26786312 PMCID: PMC4871791 DOI: 10.1016/j.biopsych.2015.10.026] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 10/27/2015] [Accepted: 10/27/2015] [Indexed: 01/30/2023]
Abstract
BACKGROUND Distinguishing between actions that are more likely or less likely to be rewarded is a critical aspect of goal-directed decision making. However, neuroanatomic and molecular mechanisms are not fully understood. METHODS We used anterograde tracing, viral-mediated gene silencing, functional disconnection strategies, pharmacologic rescue, and designer receptors exclusively activated by designer drugs (DREADDs) to determine the anatomic and functional connectivity between the orbitofrontal cortex (OFC) and the amygdala in mice. In particular, we knocked down brain-derived neurotrophic factor (Bdnf) bilaterally in the OFC or generated an OFC-amygdala "disconnection" by pairing unilateral OFC Bdnf knockdown with lesions of the contralateral amygdala. We characterized decision-making strategies using a task in which mice selected actions based on the likelihood that they would be reinforced. Additionally, we assessed the effects of DREADD-mediated OFC inhibition on the consolidation of action-outcome conditioning. RESULTS As in other species, the OFC projects to the basolateral amygdala and dorsal striatum in mice. Bilateral Bdnf knockdown within the ventrolateral OFC and unilateral Bdnf knockdown accompanied by lesions of the contralateral amygdala impede goal-directed response selection, implicating BDNF-expressing OFC projection neurons in selecting actions based on their consequences. The tyrosine receptor kinase B agonist 7,8-dihydroxyflavone rescues action selection and increases dendritic spine density on excitatory neurons in the OFC. Rho-kinase inhibition also rescues goal-directed response strategies, linking neural remodeling with outcome-based decision making. Finally, DREADD-mediated OFC inhibition weakens new action-outcome memory. CONCLUSIONS Activity-dependent and BDNF-dependent neuroplasticity within the OFC coordinate outcome-based decision making through interactions with the amygdala. These interactions break reward-seeking habits, a putative factor in multiple psychopathologies.
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Affiliation(s)
- Kelsey S. Zimmermann
- Department of Pediatrics, Emory University, Atlanta, GA USA,Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA USA,Yerkes National Primate Research Center, Emory University, Atlanta, GA USA,Graduate Program in Neuroscience, Emory University, Atlanta, GA USA
| | - John A. Yamin
- Department of Pediatrics, Emory University, Atlanta, GA USA,Yerkes National Primate Research Center, Emory University, Atlanta, GA USA
| | - Donald G. Rainnie
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA USA,Yerkes National Primate Research Center, Emory University, Atlanta, GA USA,Graduate Program in Neuroscience, Emory University, Atlanta, GA USA
| | - Kerry J. Ressler
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA USA,Yerkes National Primate Research Center, Emory University, Atlanta, GA USA,Graduate Program in Neuroscience, Emory University, Atlanta, GA USA,Howard Hughes Medical Institute, Bethesda, MD, USA
| | - Shannon L. Gourley
- Department of Pediatrics, Emory University, Atlanta, GA USA,Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA USA,Yerkes National Primate Research Center, Emory University, Atlanta, GA USA,Graduate Program in Neuroscience, Emory University, Atlanta, GA USA
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19
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Anderson RM, Glanz RM, Johnson SB, Miller MM, Romig-Martin SA, Radley JJ. Prolonged corticosterone exposure induces dendritic spine remodeling and attrition in the rat medial prefrontal cortex. J Comp Neurol 2016; 524:3729-3746. [PMID: 27113541 PMCID: PMC5063662 DOI: 10.1002/cne.24027] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 03/31/2016] [Accepted: 04/20/2016] [Indexed: 12/24/2022]
Abstract
The stress-responsive hypothalamo-pituitary-adrenal (HPA) axis plays a central role in promoting adaptations acutely, whereas adverse effects on physiology and behavior following chronic challenges may result from overactivity of this system. Elevations in glucocorticoids, the end-products of HPA activation, play roles in adaptive and maladaptive processes by targeting cognate receptors throughout neurons in limbic cortical networks to alter synaptic functioning. Because previous work has shown that chronic stress leads to functionally relevant regressive alterations in dendritic spine shape and number in pyramidal neurons in the medial prefrontal cortex (mPFC), this study examines the capacity of sustained increases in circulating corticosterone (B) alone to alter dendritic spine morphology and density in this region. Subcutaneous B pellets were implanted in rats to provide continuous exposure to levels approximating the circadian mean or peak of the steroid for 1, 2, or 3 weeks. Pyramidal neurons in the prelimbic area of the mPFC were selected for intracellular fluorescent dye filling, followed by high-resolution three-dimensional imaging and analysis of dendritic arborization and spine morphometry. Two or more weeks of B exposure decreased dendritic spine volume in the mPFC, whereas higher dose exposure of the steroid resulted in apical dendritic retraction and spine loss in the same cell population, with thin spine subtypes showing the greatest degree of attrition. Finally, these structural alterations were noted to persist following a 3-week washout period and corresponding restoration of circadian HPA rhythmicity. These studies suggest that prolonged disruptions in adrenocortical functioning may be sufficient to induce enduring regressive structural and functional alterations in the mPFC. J. Comp. Neurol. 524:3729-3746, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Rachel M Anderson
- Department of Psychological and Brain Sciences and Program in Neuroscience, University of Iowa, Iowa City, Iowa, 52242
| | - Ryan M Glanz
- Department of Psychological and Brain Sciences and Program in Neuroscience, University of Iowa, Iowa City, Iowa, 52242
| | - Shane B Johnson
- Department of Psychological and Brain Sciences and Program in Neuroscience, University of Iowa, Iowa City, Iowa, 52242
| | - Mary M Miller
- Department of Psychological and Brain Sciences and Program in Neuroscience, University of Iowa, Iowa City, Iowa, 52242
| | - Sara A Romig-Martin
- Department of Psychological and Brain Sciences and Program in Neuroscience, University of Iowa, Iowa City, Iowa, 52242
| | - Jason J Radley
- Department of Psychological and Brain Sciences and Program in Neuroscience, University of Iowa, Iowa City, Iowa, 52242.
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20
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Li G, Ling S. MiR-124 Promotes Newborn Olfactory Bulb Neuron Dendritic Morphogenesis and Spine Density. J Mol Neurosci 2016; 61:159-168. [PMID: 27924451 DOI: 10.1007/s12031-016-0873-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/29/2016] [Indexed: 12/13/2022]
Abstract
Using microarray analysis, we detected microRNA-124 (miR-124) to be abundantly expressed in the olfactory bulb (OB). miR-124 regulates adult neurogenesis in the subventricular zone (SVZ). However, much less is known about its role in newborn OB neurons. Here, using both gain-of-function and loss-of-function approaches, we demonstrate that brain-specific miR-124 affects dendritic morphogenesis and spine density in newborn OB neurons. Functional Annotation Clustering of miR-124 targets was enriched in "cell morphogenesis involved in neuron differentiation."
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Affiliation(s)
- Guifa Li
- Department of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Shucai Ling
- Department of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China.
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21
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DePoy LM, Allen AG, Gourley SL. Adolescent cocaine self-administration induces habit behavior in adulthood: sex differences and structural consequences. Transl Psychiatry 2016; 6:e875. [PMID: 27576164 PMCID: PMC5022090 DOI: 10.1038/tp.2016.150] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 06/02/2015] [Accepted: 06/30/2016] [Indexed: 12/15/2022] Open
Abstract
Adolescent cocaine use increases the likelihood of drug abuse and addiction in adulthood, and etiological factors may include a cocaine-induced bias towards so-called 'reward-seeking' habits. To determine whether adolescent cocaine exposure indeed impacts decision-making strategies in adulthood, we trained adolescent mice to orally self-administer cocaine. In adulthood, males with a history of escalating self-administration developed a bias towards habit-based behaviors. In contrast, escalating females did not develop habit biases; rather, low response rates were associated with later behavioral inflexibility, independent of cocaine dose. We focused the rest of our report on understanding how individual differences in young-adolescent females predicted long-term behavioral outcomes. Low, 'stable' cocaine-reinforced response rates during adolescence were associated with cocaine-conditioned object preference and enlarged dendritic spine head size in the medial (prelimbic) prefrontal cortex in adulthood. Meanwhile, cocaine resilience was associated with enlarged spine heads in deep-layer orbitofrontal cortex. Re-exposure to the cocaine-associated context in adulthood energized responding in 'stable responders', which could then be reduced by the GABAB agonist baclofen and the putative tyrosine receptor kinase B (trkB) agonist, 7,8-dihydroxyflavone. Together, our findings highlight resilience to cocaine-induced habits in females relative to males when intake escalates. However, failures in instrumental conditioning in adolescent females may precipitate reward-seeking behaviors in adulthood, particularly in the context of cocaine exposure.
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Affiliation(s)
- L M DePoy
- Department of Pediatrics, Emory School of Medicine, Emory University, Atlanta, GA, USA
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, USA
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, USA
| | - A G Allen
- Department of Pediatrics, Emory School of Medicine, Emory University, Atlanta, GA, USA
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, USA
| | - S L Gourley
- Department of Pediatrics, Emory School of Medicine, Emory University, Atlanta, GA, USA
- Yerkes National Primate Research Center, Emory University, Atlanta, GA, USA
- Graduate Program in Neuroscience, Emory University, Atlanta, GA, USA
- Department of Psychiatry and Behavioral Sciences, Emory School of Medicine, Emory University, Atlanta, GA, USA
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22
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Zimmermann KS, Hsu CC, Gourley SL. Strain commonalities and differences in response-outcome decision making in mice. Neurobiol Learn Mem 2016; 131:101-8. [PMID: 27003118 DOI: 10.1016/j.nlm.2016.03.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 02/26/2016] [Accepted: 03/18/2016] [Indexed: 01/08/2023]
Abstract
The ability to select between actions that are more vs. less likely to be reinforced is necessary for survival and navigation of a changing environment. A task termed "response-outcome contingency degradation" can be used in the laboratory to determine whether rodents behave according to such goal-directed response strategies. In one iteration of this task, rodents are trained to perform two food-reinforced behaviors, then the predictive relationship between one instrumental response and the associated outcome is modified by providing the reinforcer associated with that response non-contingently. During a subsequent probe test, animals can select between the two trained responses. Preferential engagement of the behavior most likely to be reinforced is considered goal-directed, while non-selective responding is considered a failure in response-outcome conditioning, or "habitual." This test has largely been used with rats, and less so with mice. Here we compiled data collected from several cohorts of mice tested in our lab between 2012 and 2015. Mice were bred on either a C57BL/6 or predominantly BALB/c strain background. We report that both strains of mice can use information acquired as a result of instrumental contingency degradation training to select amongst multiple response options the response most likely to be reinforced. Mice differ, however, during the training sessions when the familiar response-outcome contingency is being violated. BALB/c mice readily generate perseverative or habit-like response strategies when the only available response is unlikely to be reinforced, while C57BL/6 mice more readily inhibit responding. These findings provide evidence of strain differences in response strategies when an anticipated reinforcer is unlikely to be delivered.
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Affiliation(s)
- Kelsey S Zimmermann
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, United States; Graduate Program in Neuroscience, Emory University, United States; Yerkes National Primate Research Center, Emory University, United States
| | - Chia-Chun Hsu
- Graduate Program in Neuroscience, Emory University, United States; Yerkes National Primate Research Center, Emory University, United States
| | - Shannon L Gourley
- Departments of Pediatrics and Psychiatry, Emory University School of Medicine, United States; Graduate Program in Neuroscience, Emory University, United States; Yerkes National Primate Research Center, Emory University, United States.
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23
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Short-term withdrawal from developmental exposure to cocaine activates the glucocorticoid receptor and alters spine dynamics. Eur Neuropsychopharmacol 2015; 25:1832-41. [PMID: 26004981 DOI: 10.1016/j.euroneuro.2015.05.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 04/27/2015] [Accepted: 05/05/2015] [Indexed: 01/19/2023]
Abstract
Although glucocorticoid receptors (GRs) contribute to the action of cocaine, their role following developmental exposure to the psychostimulant is still unknown. To address this issue, we exposed adolescent male rats to cocaine (20mg/kg/day) from post-natal day (PND) 28 to PND 42 and sacrificed them at PND 45 or 90. We studied the medial prefrontal cortex (mPFC), a brain region that is still developing during adolescence. In PND 45 rats we found enhanced GR transcription and translation as well as increased trafficking toward the nucleus of the receptor, with no alteration in plasma corticosterone levels. We also showed reduced expression of the GR co-chaperone FKBP51, that normally keeps the receptor in the cytoplasm, and increased expression of Src1, which cooperates in the activation of GR transcriptional activity, revealing that short withdrawal alters the finely tuned mechanisms regulating GR action. Since activation of GRs regulate dendritic spine morphology, we next investigated spine dynamics in cocaine-withdrawn rats. We found that PSD95, cofilin and F-actin, molecules regulating spine actin network, are reduced in the mPFC of PND 45 rats suggesting reduced spine density, confirmed by confocal imaging. Further, formation of filopodia, i.e. the inactive spines, is enhanced suggesting the formation of non-functional spines. Of note, no changes were found in molecules related to GR machinery or spine dynamics following long-term abstinence, i.e. in adult rats (PND 90). These findings demonstrate that short withdrawal promotes plastic changes in the developing brain via the dysregulation of the GR system and alterations in the spine network.
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Butkovich LM, DePoy LM, Allen AG, Shapiro LP, Swanson AM, Gourley SL. Adolescent-onset GABAA α1 silencing regulates reward-related decision making. Eur J Neurosci 2015; 42:2114-2121. [PMID: 26096050 DOI: 10.1111/ejn.12995] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 06/11/2015] [Accepted: 06/17/2015] [Indexed: 11/30/2022]
Abstract
The GABAA receptor mediates fast, inhibitory signaling, and cortical expression of the α1 subunit increases during postnatal development. Certain pathological stimuli such as stressors or prenatal cocaine exposure can interfere with this process, but causal relationships between GABAA α1 deficiency and complex behavioral outcomes remain unconfirmed. We chronically reduced GABAA α1 expression selectively in the medial prefrontal cortex (prelimbic subregion) of mice using viral-mediated gene silencing of Gabra1. Adolescent-onset Gabra1 knockdown delayed the acquisition of a cocaine-reinforced instrumental response but spared cocaine seeking in extinction and in a cue-induced reinstatement procedure. To determine whether response acquisition deficits could be associated with impairments in action-outcome associative learning and memory, we next assessed behavioral sensitivity to instrumental contingency degradation. In this case, the predictive relationship between familiar actions and their outcomes is violated. Adolescent-onset knockdown, although not adult-onset knockdown, delayed the expression of goal-directed response strategies in this task, resulting instead in inflexible habit-like modes of response. Thus, the maturation of medial prefrontal cortex GABAA α1 systems during adolescence appears necessary for goal-directed reward-related decision making in adulthood. These findings are discussed in the light of evidence that prolonged Gabra1 deficiency may impair synaptic plasticity.
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Affiliation(s)
| | - Lauren M DePoy
- Graduate Program in Neuroscience, Emory University.,Department of Pediatrics, Emory University.,Yerkes National Primate Research Center, Emory University
| | - Amanda G Allen
- Department of Pediatrics, Emory University.,Yerkes National Primate Research Center, Emory University
| | - Lauren P Shapiro
- Department of Pediatrics, Emory University.,Yerkes National Primate Research Center, Emory University.,Molecular and Systems Pharmacology, Emory University
| | - Andrew M Swanson
- Graduate Program in Neuroscience, Emory University.,Department of Pediatrics, Emory University.,Yerkes National Primate Research Center, Emory University
| | - Shannon L Gourley
- Graduate Program in Neuroscience, Emory University.,Department of Pediatrics, Emory University.,Yerkes National Primate Research Center, Emory University.,Department of Psychiatry and Behavioral Sciences, Emory University
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McKlveen JM, Myers B, Herman JP. The medial prefrontal cortex: coordinator of autonomic, neuroendocrine and behavioural responses to stress. J Neuroendocrinol 2015; 27:446-56. [PMID: 25737097 PMCID: PMC4580281 DOI: 10.1111/jne.12272] [Citation(s) in RCA: 150] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 02/10/2015] [Accepted: 02/26/2015] [Indexed: 12/13/2022]
Abstract
Responding to real or potential threats in the environment requires the coordination of autonomic, neuroendocrine and behavioural processes to promote adaptation and survival. These diverging systems necessitate input from the limbic forebrain to integrate and modulate functional output in accordance with contextual demand. In the present review, we discuss the potential role of the medial prefrontal cortex (mPFC) as a coordinator of behavioural and physiological stress responses across multiple temporal and contextual domains. Furthermore, we highlight converging evidence from rodent and human research indicating the necessity of the mPFC for modulating physiological energetic systems to mobilise or limit energetic resources as needed to ultimately promote behavioural adaptation in the face of stress. We review the literature indicating that glucocorticoids act as one of the primary messengers in the reallocation of energetic resources having profound effects locally within the mPFC, as well as shaping how the mPFC acts within a network of brain structures to modulate responses to stress. Finally, we discuss how both rodent and human studies point toward a critical role of the mPFC in the coordination of anticipatory responses to stress and why this distinction is an important one to make in stress neurobiology.
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Affiliation(s)
- Jessica M. McKlveen
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH, 45237, USA
- Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH, 45267, USA
| | - Brent Myers
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH, 45237, USA
| | - James P. Herman
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH, 45237, USA
- Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH, 45267, USA
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26
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GABAAα1-mediated plasticity in the orbitofrontal cortex regulates context-dependent action selection. Neuropsychopharmacology 2015; 40:1027-36. [PMID: 25348603 PMCID: PMC4330518 DOI: 10.1038/npp.2014.292] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 10/21/2014] [Accepted: 10/22/2014] [Indexed: 01/04/2023]
Abstract
An essential aspect of goal-directed action selection is differentiating between behaviors that are more, or less, likely to be reinforced. Habits, by contrast, are stimulus-elicited behaviors insensitive to action-outcome contingencies and are considered an etiological factor in several neuropsychiatric disorders. Thus, isolating the neuroanatomy and neurobiology of goal-directed action selection on the one hand, and habit formation on the other, is critical. Using in vivo viral-mediated gene silencing, we knocked down Gabra1 in the orbitofrontal prefrontal cortex (oPFC) in mice, decreasing oPFC GABAAα1 expression, as well as expression of the synaptic marker PSD-95. Mice expressing Green Fluorescent Protein or Gabra1 knockdown in the adjacent M2 motor cortex served as comparison groups. Using instrumental response training followed by action-outcome contingency degradation, we then found that oPFC GABAAα1 deficiency impaired animals' ability to differentiate between actions that were more or less likely to be reinforced, though sensitivity to outcome devaluation and extinction were intact. Meanwhile, M2 GABAAα1 deficiency enhanced sensitivity to action-outcome relationships. Behavioral abnormalities following oPFC GABAAα1 knockdown were rescued by testing mice in a distinct context relative to that in which they had been initially trained. Together, our findings corroborate evidence that chronic GABAAα1 deficiency remodels cortical synapses and suggest that neuroplasticity within the healthy oPFC gates the influence of reward-related contextual stimuli. These stimuli might otherwise promote maladaptive habit-based behavioral response strategies that contribute to-or exacerbate-neuropsychiatric illness.
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Barker JM, Taylor JR. Habitual alcohol seeking: modeling the transition from casual drinking to addiction. Neurosci Biobehav Rev 2014; 47:281-94. [PMID: 25193245 PMCID: PMC4258136 DOI: 10.1016/j.neubiorev.2014.08.012] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 07/17/2014] [Accepted: 08/25/2014] [Indexed: 12/29/2022]
Abstract
The transition from goal-directed actions to habitual ethanol seeking models the development of addictive behavior that characterizes alcohol use disorders. The progression to habitual ethanol-seeking behavior occurs more rapidly than for natural rewards, suggesting that ethanol may act on habit circuit to drive the loss of behavioral flexibility. This review will highlight recent research that has focused on the formation and expression of habitual ethanol seeking, and the commonalities and distinctions between ethanol and natural reward-seeking habits, with the goal of highlighting important, understudied research areas that we believe will lead toward the development of novel treatment and prevention strategies for uncontrolled drinking.
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Affiliation(s)
- Jacqueline M Barker
- Department of Psychiatry, Yale University School of Medicine, Ribicoff Labs, New Haven, CT, USA; Interdepartmental Neuroscience Program, Yale University School of Medicine, New Haven, CT, USA
| | - Jane R Taylor
- Interdepartmental Neuroscience Program, Yale University School of Medicine, New Haven, CT, USA.
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