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Reed CH, Tystahl AC, Eo H, Buhr TJ, Bauer EE, Lee JH, Clark PJ, Valentine RJ. The Influence of Stress and Binge-Patterned Alcohol Drinking on Mouse Skeletal Muscle Protein Synthesis and Degradation Pathways. Biomolecules 2024; 14:527. [PMID: 38785934 PMCID: PMC11118922 DOI: 10.3390/biom14050527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/30/2024] [Accepted: 04/09/2024] [Indexed: 05/25/2024] Open
Abstract
Adverse experiences (e.g., acute stress) and alcohol misuse can both impair skeletal muscle homeostasis, resulting in reduced protein synthesis and greater protein breakdown. Exposure to acute stress is a significant risk factor for engaging in alcohol misuse. However, little is known about how these factors together might further affect skeletal muscle health. To that end, this study investigated the effects of acute stress exposure followed by a period of binge-patterned alcohol drinking on signaling factors along mouse skeletal muscle protein synthesis (MPS) and degradation (MPD) pathways. Young adult male C57BL/6J mice participated in the Drinking in the Dark paradigm, where they received 2-4 h of access to 20% ethanol (alcohol group) or water (control group) for four days to establish baseline drinking levels. Three days later, half of the mice in each group were either exposed to a single episode of uncontrollable tail shocks (acute stress) or remained undisturbed in their home cages (no stress). Three days after stress exposure, mice received 4 h of access to 20% ethanol (alcohol) to model binge-patterned alcohol drinking or water for ten consecutive days. Immediately following the final episode of alcohol access, mouse gastrocnemius muscle was extracted to measure changes in relative protein levels along the Akt-mTOR MPS, as well as the ubiquitin-proteasome pathway (UPP) and autophagy MPD pathways via Western blotting. A single exposure to acute stress impaired Akt singling and reduced rates of MPS, independent of alcohol access. This observation was concurrent with a potent increase in heat shock protein seventy expression in the muscle of stressed mice. Alcohol drinking did not exacerbate stress-induced alterations in the MPS and MPD signaling pathways. Instead, changes in the MPS and MPD signaling factors due to alcohol access were primarily observed in non-stressed mice. Taken together, these data suggest that exposure to a stressor of sufficient intensity may cause prolonged disruptions to signaling factors that impact skeletal muscle health and function beyond what could be further induced by periods of alcohol misuse.
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Affiliation(s)
- Carter H Reed
- Department of Biology, Grand View University, Des Moines, IA 50316, USA;
| | - Anna C. Tystahl
- Department of Kinesiology, Iowa State University, Ames, IA 50011, USA; (A.C.T.)
| | - Hyeyoon Eo
- Department of Kinesiology, Iowa State University, Ames, IA 50011, USA; (A.C.T.)
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA
| | - Trevor J. Buhr
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA
| | - Ella E. Bauer
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA
| | - Ji Heun Lee
- Department of Kinesiology, Iowa State University, Ames, IA 50011, USA; (A.C.T.)
| | - Peter J. Clark
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA
| | - Rudy J. Valentine
- Department of Physical Therapy and Kinesiology, University of Massachusetts Lowell, Lowell, MA 01854, USA
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2
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Favoretto CA, Bertagna NB, Righi T, Rodolpho BT, Anjos-Santos A, Silva FBR, Bianchi PC, Cruz FC. Impacts of maternal separation stress on ethanol-related responses, anxiety- and depressive-like behaviors in adolescent mice. Neurosci Lett 2023; 809:137295. [PMID: 37182574 DOI: 10.1016/j.neulet.2023.137295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/18/2023] [Accepted: 05/08/2023] [Indexed: 05/16/2023]
Abstract
The present work evaluated the consequences of chronic maternal separation (MS), an animal model of early-life stress, on ethanol intake and striatal Fos expression induced by ethanol consumption. Furthermore, we analyzed MS impacts on anxiety- and depressive-like behaviors and on locomotor and plasma corticosterone responses to intraperitoneal treatment with ethanol in adolescent mice. For that, male and female C57BL/6J mice were exposed or not to MS stress, for 3 h per day, from postnatal day (PND) 1 to 14, and submitted to behavioral tests from PND 28. In Experiment 1, MS and control groups of mice were submitted to an involuntary ethanol intake protocol, and striatal Fos expression following ethanol exposure was analyzed. In Experiment 2, mice behavior was assessed in elevated plus-maze, sucrose splash, saccharin preference, and open field tests. Locomotor and plasma corticosterone responses induced by a systemic dose of ethanol (1.75 g/kg) were also evaluated. Our results demonstrated that MS increased ethanol intake only in an acute manner and did not impact ethanol-induced Fos expression in the dorsal striatum and nucleus accumbens (NAc) core and shell subregions. MS did not change the parameters analyzed during elevated plus-maze, sucrose splash, preference for saccharin, and open field tests. MS did not affect locomotor activity following ethanol injection nor plasma corticosterone response to the drug. Thus, our data showed that MS transiently increased ethanol intake. However, early-life stress did not impact Fos, locomotor, or plasma corticosterone responses to the drug. In addition, MS did not affect anxiety- and depressive-like behaviors in adolescent mice.
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Affiliation(s)
- C A Favoretto
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - N B Bertagna
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - T Righi
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - B T Rodolpho
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - A Anjos-Santos
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - F B R Silva
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - P C Bianchi
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil
| | - F C Cruz
- Molecular and Behavioral Neuroscience Laboratory, Pharmacology Department, Universidade Federal de São Paulo, São Paulo, Brazil.
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Buhr TJ, Reed CH, Wee OM, Lee JH, Yuan LL, Fleshner M, Valentine RJ, Clark PJ. The persistence of stress-induced physical inactivity in rats: an investigation of central monoamine neurotransmitters and skeletal muscle oxidative stress. Front Behav Neurosci 2023; 17:1169151. [PMID: 37273279 PMCID: PMC10237271 DOI: 10.3389/fnbeh.2023.1169151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Accepted: 04/24/2023] [Indexed: 06/06/2023] Open
Abstract
Introduction Sedentary lifestyles have reached epidemic proportions world-wide. A growing body of literature suggests that exposures to adverse experiences (e.g., psychological traumas) are a significant risk factor for the development of physically inactive lifestyles. However, the biological mechanisms linking prior stress exposure and persistent deficits in physical activity engagement remains poorly understood. Methods The purpose of this study was twofold. First, to identify acute stress intensity thresholds that elicit long-term wheel running deficits in rats. To that end, young adult male rats were exposed to a single episode of 0, 50, or 100 uncontrollable tail shocks and then given free access to running wheels for 9 weeks. Second, to identify stress-induced changes to central monoamine neurotransmitters and peripheral muscle physiology that may be maladaptive to exercise output. For this study, rats were either exposed to a single episode of uncontrollable tail shocks (stress) or left undisturbed in home cages (unstressed). Eight days later, monoamine-related neurochemicals were quantified by ultra-high performance liquid chromatography (UHPLC) across brain reward, motor, and emotion structures immediately following a bout of graded treadmill exercise controlled for duration and intensity. Additionally, protein markers of oxidative stress, inflammation, and metabolic activity were assessed in the gastrocnemius muscle by Western blot. Results For experiment 1, stress exposure caused a shock number-dependent two to fourfold decrease in wheel running distance across the entire duration of the study. For experiment 2, stress exposure curbed an exercise-induced increase of dopamine (DA) turnover measures in the prefrontal cortex and hippocampus, and augmented serotonin (5HT) turnover in the hypothalamus and remaining cortical area. However, stress exposure also caused several monoaminergic changes independent of exercise that could underlie impaired motivation for physical activity, including a mild dopamine deficiency in the striatal area. Finally, stress potently increased HSP70 and lowered SOD2 protein concentrations in the gastrocnemius muscle, which may indicate prolonged oxidative stress. Discussion These data support some of the possible central and peripheral mechanisms by which exposure to adverse experiences may chronically impair physical activity engagement.
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Affiliation(s)
- Trevor J. Buhr
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
- Interdepartmental Neuroscience Program, Iowa State University, Ames, IA, United States
| | - Carter H. Reed
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
- Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - Olivia M. Wee
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
| | - Ji Heun Lee
- Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - Li-Lian Yuan
- Physiology and Pharmacology, Des Moines University, Des Moines, IA, United States
| | - Monika Fleshner
- Department of Integrative Physiology, University of Colorado, Boulder, Boulder, CO, United States
| | - Rudy J. Valentine
- Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - Peter J. Clark
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
- Interdepartmental Neuroscience Program, Iowa State University, Ames, IA, United States
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Chen H, Dong G, Li K. Overview on brain function enhancement of Internet addicts through exercise intervention: Based on reward-execution-decision cycle. Front Psychiatry 2023; 14:1094583. [PMID: 36816421 PMCID: PMC9933907 DOI: 10.3389/fpsyt.2023.1094583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Accepted: 01/13/2023] [Indexed: 02/05/2023] Open
Abstract
Internet addiction (IA) has become an impulse control disorder included in the category of psychiatric disorders. The IA trend significantly increased after the outbreak of the new crown epidemic. IA damages some brain functions in humans. Emerging evidence suggests that exercise exerts beneficial effects on the brain function and cognitive level damaged by IA. This work reviews the neurobiological mechanisms of IA and describes the brain function impairment by IA from three systems: reward, execution, and decision-making. Furthermore, we sort out the research related to exercise intervention on IA and its effect on improving brain function. The internal and external factors that produce IA must be considered when summarizing movement interventions from a behavioral perspective. We can design exercise prescriptions based on exercise interests and achieve the goal of quitting IA. This work explores the possible mechanisms of exercise to improve IA through systematic analysis. Furthermore, this work provides research directions for the future targeted design of exercise prescriptions.
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Affiliation(s)
- Hao Chen
- Department of Sports, Quzhou University, Quzhou, China.,Department of Graduate School of Education, Shandong Sport University, Jinan, China
| | - Guijun Dong
- Department of Sports, Quzhou University, Quzhou, China.,Department of Graduate School of Education, Shandong Sport University, Jinan, China
| | - Kefeng Li
- Department of Medicine, Quzhou College of Technology, Quzhou, China
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Bauer EE, Reed CH, Lyte M, Clark PJ. An evaluation of the rat intestinal monoamine biogeography days following exposure to acute stress. Front Physiol 2022; 13:1021985. [PMID: 36582358 PMCID: PMC9792511 DOI: 10.3389/fphys.2022.1021985] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 11/16/2022] [Indexed: 12/15/2022] Open
Abstract
Stress-induced abnormalities in gut monoamine levels (e.g., serotonin, dopamine, norepinephrine) have been linked to gastrointestinal (GI) dysfunction, as well as the worsening of symptoms in GI disorders. However, the influence of stress on changes across the entire intestinal monoamine biogeography has not been well-characterized, especially in the days following stress exposure. Therefore, the aim of this study was to comprehensively assess changes to monoamine neurochemical signatures across the entire rat intestinal tract days after exposure to an acute stressor. To the end, adult male F344 rats were subjected to an episode of unpredictable tail shocks (acute stress) or left undisturbed. Forty-eight hours later rats were euthanized either following a 12 h period of fasting or 30 min of food access to evaluate neurochemical profiles during the peri- and early postprandial periods. Monoamine-related neurochemicals were measured via UHPLC in regions of the small intestine (duodenum, jejunum, ileum), large intestine (cecum, proximal colon, distal colon), cecal contents, fecal contents, and liver. The results suggest a relatively wide-spread increase in measures of serotonin activity across intestinal regions can be observed 48 h after exposure to acute stress, however some evidence was found supporting localized differences in serotonin metabolization. Moreover, acute stress exposure reduced catecholamine-related neurochemical concentrations most notably in the ileum, and to a lesser extent in the cecal contents. Next, stress-related fecal serotonin concentrations were consistent with intestinal profiles. However, fecal dopamine was elevated in association with stress, which did not parallel findings in any other intestinal area. Finally, stress exposure and the food access period together only had minor effects on intestinal monoamine profiles. Taken together, these data suggest nuanced differences in monoaminergic profiles exist across intestinal regions the days following exposure to an acute stressor, highlighting the importance of assessments that consider the entire intestinal tract biogeography when investigating stress-related biological outcomes that may be relevant to GI pathophysiology.
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Affiliation(s)
- Ella E. Bauer
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
| | - Carter H. Reed
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
- Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - Mark Lyte
- Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA, United States
| | - Peter J. Clark
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
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6
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Reed CH, Bauer EE, Shoeman A, Buhr TJ, Clark PJ. Acute Stress Exposure Alters Food-Related Brain Monoaminergic Profiles in a Rat Model of Anorexia. J Nutr 2021; 151:3617-3627. [PMID: 34522956 PMCID: PMC8643607 DOI: 10.1093/jn/nxab298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/02/2021] [Accepted: 08/12/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Adverse life experiences are a major risk factor for anorexia nervosa (AN). Eating-provoked anxiousness associated with AN is postulated to be due to food-related exaggerated serotonin activity in the brain and imbalances of monoamine neurotransmitters. OBJECTIVES Using a rodent model of stress-induced hypophagia, we investigated if stress exposure augments food-related serotonin turnover and imbalances in measures of brain serotonin and dopamine activity in manners consistent with anxiousness toward food and restricted eating. METHODS Adult male F344 rats were conditioned to associate an audio cue with daily food over 2 weeks, after which half of the rats were exposed to a single episode of tail shocks (stress) or left undisturbed (nonstressed). All rats were killed 48 h later, during a control period, the food-associated cue, or a period of food access. Serotonin, dopamine, and norepinephrine, as well as metabolite concentrations, were assessed across brain regions comprising reward, emotion, and feeding circuits relevant to AN in acutely stressed and nonstressed rats using HPLC. Statistical significance level was 5%. RESULTS Stress-induced rat hypophagia paralleled an augmented serotonin turnover in response to the food-associated cue in the hypothalamus and hippocampus, as well as food access in the hypothalamus and cortical areas (all P < 0.05). Stress exposure increased the ratio of serotonin to dopamine metabolites across several brain areas, but the magnitude of this imbalance was further augmented during the food-associated cue and food access in the brainstem, hippocampus, and cortical areas (all P < 0.05). Finally, stress lowered norepinephrine concentrations by 18% in the hypothalamus (P < 0.05). CONCLUSIONS The observed stress-induced changes to monoamine profiles in rats could have key implications for physiological states that contribute to restricted eating and may hold relevance for the development of AN precipitated by adverse life experiences.
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Affiliation(s)
- Carter H Reed
- Interdepartmental Graduate Program in Nutritional Sciences, Iowa State University, Ames, IA, USA,Department of Kinesiology, Iowa State University, Ames, IA, USA
| | - Ella E Bauer
- Interdepartmental Graduate Program in Nutritional Sciences, Iowa State University, Ames, IA, USA,Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA,Neuroscience Program, Iowa State University, Ames, IA, USA
| | - Allyse Shoeman
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
| | - Trevor J Buhr
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA,Neuroscience Program, Iowa State University, Ames, IA, USA
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7
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Proteome profile of telencephalon associates attenuated neurogenesis with chronic stress induced mood disorder phenotypes in zebrafish model. Pharmacol Biochem Behav 2021; 204:173170. [DOI: 10.1016/j.pbb.2021.173170] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 02/28/2021] [Accepted: 02/28/2021] [Indexed: 02/07/2023]
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8
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Buhr TJ, Reed CH, Shoeman A, Bauer EE, Valentine RJ, Clark PJ. The Influence of Moderate Physical Activity on Brain Monoaminergic Responses to Binge-Patterned Alcohol Ingestion in Female Mice. Front Behav Neurosci 2021; 15:639790. [PMID: 33716684 PMCID: PMC7947191 DOI: 10.3389/fnbeh.2021.639790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 01/25/2021] [Indexed: 01/16/2023] Open
Abstract
Monoamine neurotransmitter activity in brain reward, limbic, and motor areas play key roles in the motivation to misuse alcohol and can become modified by exercise in a manner that may affect alcohol craving. This study investigated the influence of daily moderate physical activity on monoamine-related neurochemical concentrations across the mouse brain in response to high volume ethanol ingestion. Adult female C57BL/6J mice were housed with or without 2.5 h of daily access to running wheels for 30 days. On the last 5 days, mice participated in the voluntary binge-like ethanol drinking procedure, “Drinking in the dark” (DID). Mice were sampled immediately following the final episode of DID. Monoamine-related neurochemical concentrations were measured across brain regions comprising reward, limbic, and motor circuits using ultra High-Performance Liquid Chromatography (UHPLC). The results suggest that physical activity status did not influence ethanol ingestion during DID. Moreover, daily running wheel access only mildly influenced alcohol-related norepinephrine concentrations in the hypothalamus and prefrontal cortex, as well as serotonin turnover in the hippocampus. However, access to alcohol during DID eliminated wheel running-related decreases of norepinephrine, serotonin, and 5-HIAA content in the hypothalamus, but also to a lesser extent for norepinephrine in the hippocampus and caudal cortical areas. Finally, alcohol access increased serotonin and dopamine-related neurochemical turnover in the striatum and brainstem areas, regardless of physical activity status. Together, these data provide a relatively thorough assessment of monoamine-related neurochemical levels across the brain in response to voluntary binge-patterned ethanol drinking, but also adds to a growing body of research questioning the utility of moderate physical activity as an intervention to curb alcohol abuse.
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Affiliation(s)
- Trevor J Buhr
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States.,Neuroscience Program, Iowa State University, Ames, IA, United States
| | - Carter H Reed
- Interdepartmental Graduate Program in Nutritional Sciences, Iowa State University, Ames, IA, United States.,Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - Allyse Shoeman
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States.,Neuroscience Program, Iowa State University, Ames, IA, United States
| | - Ella E Bauer
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States.,Neuroscience Program, Iowa State University, Ames, IA, United States.,Interdepartmental Graduate Program in Nutritional Sciences, Iowa State University, Ames, IA, United States
| | - Rudy J Valentine
- Interdepartmental Graduate Program in Nutritional Sciences, Iowa State University, Ames, IA, United States.,Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - Peter J Clark
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States.,Neuroscience Program, Iowa State University, Ames, IA, United States.,Interdepartmental Graduate Program in Nutritional Sciences, Iowa State University, Ames, IA, United States
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9
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Wang KS, Delgado MR. The Protective Effects of Perceived Control During Repeated Exposure to Aversive Stimuli. Front Neurosci 2021; 15:625816. [PMID: 33613186 PMCID: PMC7887306 DOI: 10.3389/fnins.2021.625816] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 01/11/2021] [Indexed: 01/10/2023] Open
Abstract
The ability to perceive and exercise control is a major contributor to our mental and physical wellbeing. When faced with uncontrollable aversive stimuli, organisms develop heightened anxiety and become unwilling to exert effort to avoid the stimuli. In contrast, when faced with controllable aversive stimuli, organisms demonstrate behavioral vigor via avoidance attempts toward trying to seek and exercise control over the environment. As such, controllability confers protective effects against reduced avoidance motivation trigged by aversive environments. These observations beg the question of whether controllability can be potent enough to reverse passivity following repeated exposure to uncontrollable aversive stimuli and how this protective effect is encoded neurally. Human participants performed a Control in Aversive Domain (CAD) task where they were first subjected to a series of repeated uncontrollable aversive stimuli (i.e., aversive tones) across several contexts that were followed by a series of controllable aversive stimuli in a novel context. Faced with persistent uncontrollability, participants significantly reduced their avoidance attempts over time and biased toward giving up. However, the subsequent presence of controllability rescued participants' avoidance behavior. Strikingly, participants who responded more strongly to the protective effects of control also had greater ventromedial prefrontal cortical (vmPFC) activation-a region previously observed to be associated with encoding the subjective value of control. Taken together, these findings highlighted the protective effect conferred by perceived control against passivity and offered insights into the potential role of the vmPFC in controllable environments, with implications for understanding the beneficial influence of perceived control on adaptive behavior.
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Affiliation(s)
- Kainan S. Wang
- McLean Imaging Center, McLean Hospital, Belmont, MA, United States
- Harvard Medical School, Boston, MA, United States
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10
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Marrocco J, Verhaeghe R, Bucci D, Di Menna L, Traficante A, Bouwalerh H, Van Camp G, Ghiglieri V, Picconi B, Calabresi P, Ravasi L, Cisani F, Bagheri F, Pittaluga A, Bruno V, Battaglia G, Morley-Fletcher S, Nicoletti F, Maccari S. Maternal stress programs accelerated aging of the basal ganglia motor system in offspring. Neurobiol Stress 2020; 13:100265. [PMID: 33344718 PMCID: PMC7739146 DOI: 10.1016/j.ynstr.2020.100265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 10/11/2020] [Accepted: 10/22/2020] [Indexed: 11/26/2022] Open
Abstract
Early-life stress involved in the programming of stress-related illnesses can have a toxic influence on the functioning of the nigrostriatal motor system during aging. We examined the effects of perinatal stress (PRS) on the neurochemical, electrophysiological, histological, neuroimaging, and behavioral correlates of striatal motor function in adult (4 months of age) and old (21 months of age) male rats. Adult PRS offspring rats showed reduced dopamine (DA) release in the striatum associated with reductions in tyrosine hydroxylase-positive (TH+) cells and DA transporter (DAT) levels, with no loss of striatal dopaminergic terminals as assessed by positron emission tomography analysis with fluorine-18-l-dihydroxyphenylalanine. Striatal levels of DA and its metabolites were increased in PRS rats. In contrast, D2 DA receptor signaling was reduced and A2A adenosine receptor signaling was increased in the striatum of adult PRS rats. This indicated enhanced activity of the indirect pathway of the basal ganglia motor circuit. Adult PRS rats also showed poorer performance in the grip strength test and motor learning tasks. The aged PRS rats also showed a persistent reduction in striatal DA release and defective motor skills in the pasta matrix and ladder rung walking tests. In addition, the old rats showed large increases in the levels of SNAP-25 and synaptophysin, which are synaptic vesicle-related proteins in the striatum, and in the PRS group only, reductions in Syntaxin-1 and Rab3a protein levels were observed. Our findings indicated that the age-dependent threshold for motor dysfunction was lowered in PRS rats. This area of research is underdeveloped, and our study suggests that early-life stress can contribute to an increased understanding of how aging diseases are programmed in early-life.
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Affiliation(s)
- Jordan Marrocco
- Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology, The Rockefeller University, 10065, NY, USA
| | - Remy Verhaeghe
- IRCCS Neuromed, Località Camerelle, 86077, Pozzilli, Italy
| | - Domenico Bucci
- IRCCS Neuromed, Località Camerelle, 86077, Pozzilli, Italy
| | - Luisa Di Menna
- IRCCS Neuromed, Località Camerelle, 86077, Pozzilli, Italy
| | | | - Hammou Bouwalerh
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France.,International Associated Laboratory (LIA) "Perinatal Stress and Neurodegenerative Diseases": University of Lille - CNRS, UMR 8576, Sapienza University of Rome and IRCCS Neuromed, Italy
| | - Gilles Van Camp
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France.,International Associated Laboratory (LIA) "Perinatal Stress and Neurodegenerative Diseases": University of Lille - CNRS, UMR 8576, Sapienza University of Rome and IRCCS Neuromed, Italy
| | - Veronica Ghiglieri
- IRCCS Santa Lucia Foundation, Laboratory of Neurophysiology, via del Fosso di Fiorano, 64, 00143, Rome, Italy.,Department of Medicine, University of Perugia, Italy
| | - Barbara Picconi
- Laboratory of Experimental Neurophysiology, IRCCS San Raffaele Pisana, Rome, Italy
| | - Paolo Calabresi
- Neurologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Piazzale Agostino Gemelli 8, 00168, Rome, Italy
| | - Laura Ravasi
- EA1046, IMPRT-IFR114, Faculty of Medicine, University of Lille, 59000, Lille, France
| | - Francesca Cisani
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France.,Dept. of Pharmacology, School of Medical and Pharmaceutical Sciences, Center of Excellence for Biochemical Research (CEBR), University of Genova, Italy
| | - Farzaneh Bagheri
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France.,School of Biology, Damghan University, Damghan, Iran
| | - Anna Pittaluga
- Dept. of Pharmacology, School of Medical and Pharmaceutical Sciences, Center of Excellence for Biochemical Research (CEBR), University of Genova, Italy.,IRCCS San Martino Hospital Genova Italy, Italy
| | - Valeria Bruno
- IRCCS Neuromed, Località Camerelle, 86077, Pozzilli, Italy.,Departments of Physiology and Pharmacology "V. Erspamer", University Sapienza of Rome, 00185, Rome, Italy
| | - Giuseppe Battaglia
- IRCCS Neuromed, Località Camerelle, 86077, Pozzilli, Italy.,Departments of Physiology and Pharmacology "V. Erspamer", University Sapienza of Rome, 00185, Rome, Italy
| | - Sara Morley-Fletcher
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France.,International Associated Laboratory (LIA) "Perinatal Stress and Neurodegenerative Diseases": University of Lille - CNRS, UMR 8576, Sapienza University of Rome and IRCCS Neuromed, Italy
| | - Ferdinando Nicoletti
- IRCCS Neuromed, Località Camerelle, 86077, Pozzilli, Italy.,Departments of Physiology and Pharmacology "V. Erspamer", University Sapienza of Rome, 00185, Rome, Italy
| | - Stefania Maccari
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France.,Science and Medical - Surgical Biotechnology, University Sapienza of Rome, 00185, Rome, Italy
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11
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Li S, Wu Q, Tang C, Chen Z, Liu L. Exercise-Based Interventions for Internet Addiction: Neurobiological and Neuropsychological Evidence. Front Psychol 2020; 11:1296. [PMID: 32670157 PMCID: PMC7330165 DOI: 10.3389/fpsyg.2020.01296] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 05/18/2020] [Indexed: 12/24/2022] Open
Abstract
With the increase in the number of internet users, the problems associated with excessive internet use have become increasingly obvious. Internet addiction can alter neurobiology, and its symptoms can be alleviated through exercise, but whether exercise exerts these effects through neurobiological pathways is unclear. Here, we reviewed the neurobiological mechanisms of exercise-based interventions against internet addiction by searching PubMed and Google Scholar for relevant research using such keywords as “exercise”, “internet addiction”, “hypothalamic-pituitary-adrenal axis”, “neurotrophin”, and “dopamine”. This review summarizes advances in our understanding of the neurobiological processes through which exercise can reduce internet addiction, and our analysis strengthens the idea that exercise-based interventions can be effective in this regard. The available evidence suggests that exercise can increase the levels of neurotrophic factors, cortisol, and neurotransmitters; improve the morphology of specific parts of the central nervous system, such as by stimulating hippocampal neurogenesis; protect the autonomic nervous system; and control the reward urge. In other words, exercise appears to mitigate internet addiction by regulating the neurobiology of the central and autonomic nervous systems. In this way, exercise-based interventions can be recommended for reducing internet addiction.
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Affiliation(s)
- Shanshan Li
- Institute of Sport Science, Sichuan University, Chengdu, China
| | - Qianjin Wu
- Institute of Sport Science, Sichuan University, Chengdu, China
| | - Cheng Tang
- Institute of Sport Science, Sichuan University, Chengdu, China
| | - Zichao Chen
- Institute of Sport Science, Sichuan University, Chengdu, China
| | - Li Liu
- Institute of Sport Science, Sichuan University, Chengdu, China
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12
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Effects of exercise on proactive interference in memory: potential neuroplasticity and neurochemical mechanisms. Psychopharmacology (Berl) 2020; 237:1917-1929. [PMID: 32488351 DOI: 10.1007/s00213-020-05554-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 05/11/2020] [Indexed: 02/07/2023]
Abstract
Proactive interference occurs when consolidated memory traces inhibit new learning. This kind of interference decreases the efficiency of new learning and also causes memory errors. Exercise has been shown to facilitate some types of cognitive function; however, whether exercise reduces proactive interference to enhance learning efficiency is not well understood. Thus, this review discusses the effects of exercise on proactive memory interference and explores potential mechanisms, such as neurogenesis and neurochemical changes, mediating any effect.
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13
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Exercise-Induced Adaptations to the Mouse Striatal Adenosine System. Neural Plast 2020; 2020:5859098. [PMID: 32399024 PMCID: PMC7204111 DOI: 10.1155/2020/5859098] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 12/18/2019] [Accepted: 12/27/2019] [Indexed: 12/13/2022] Open
Abstract
Adenosine acts as a key regulator of striatum activity, in part, through the antagonistic modulation of dopamine activity. Exercise can increase adenosine activity in the brain, which may impair dopaminergic functions in the striatum. Therefore, long-term repeated bouts of exercise may subsequently generate plasticity in striatal adenosine systems in a manner that promotes dopaminergic activity. This study investigated the effects of long-term voluntary wheel running on adenosine 1 (A1R), adenosine 2A (A2AR), dopamine 1 (D1R), and dopamine 2 (D2R) receptor protein expression in adult mouse dorsal and ventral striatum structures using immunohistochemistry. In addition, equilibrative nucleoside transporter 1 (ENT1) protein expression was examined after wheel running, as ENT1 regulates the bidirectional flux of adenosine between intra- and extracellular space. The results suggest that eight weeks of running wheel access spared age-related increases of A1R and A2AR protein concentrations across the dorsal and ventral striatal structures. Wheel running mildly reduced ENT1 protein levels in ventral striatum subregions. Moreover, wheel running mildly increased D2R protein density within striatal subregions in the dorsal medial striatum, nucleus accumbens core, and the nucleus accumbens shell. However, D1R protein expression in the striatum was unchanged by wheel running. These data suggest that exercise promotes adaptations to striatal adenosine systems. Exercise-reduced A1R and A2AR and exercise-increased D2R protein levels may contribute to improved dopaminergic signaling in the striatum. These findings may have implications for cognitive and behavioral processes, as well as motor and psychiatric diseases that involve the striatum.
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14
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Greenwood BN. The role of dopamine in overcoming aversion with exercise. Brain Res 2019; 1713:102-108. [DOI: 10.1016/j.brainres.2018.08.030] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/24/2018] [Accepted: 08/28/2018] [Indexed: 12/18/2022]
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15
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Greenwood BN, Fleshner M. Voluntary Wheel Running: A Useful Rodent Model for Investigating the Mechanisms of Stress Robustness and Neural Circuits of Exercise Motivation. Curr Opin Behav Sci 2019; 28:78-84. [PMID: 32766411 DOI: 10.1016/j.cobeha.2019.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Despite evidence that exercise reduces the negative impacts of stressor exposure and promotes stress robustness, health and well-being, most people fail to achieve recommended levels of physical activity. One reason for this failure could be our fundamental lack of understanding the brain motivational and motor circuits underlying voluntary exercise behavior. Wheel running is an animal model used to reveal mechanisms of exercise-induced stress robustness. Here we detail the strengths and weakness of wheel running as a model; and propose that running begins as a purposeful, goal-directed behavior that becomes habitual with continued access. This fresh perspective could aid in the development of novel strategies to motivate and sustain exercise behavior and maximize the stress-robust phenotype.
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Affiliation(s)
- Benjamin N Greenwood
- University of Colorado-Denver, Department of Psychology, Campus Box 173, PO Box 173364, Denver, CO 80217-3364,
| | - Monika Fleshner
- University of Colorado-Boulder, Department of Integrative Physiology, Center for Neuroscience, UCB 354, Boulder, CO 80303.,University of Colorado-Boulder, Center for Neuroscience, UCB 354, Boulder, CO 80303,
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16
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Matikainen-Ankney BA, Kravitz AV. Persistent effects of obesity: a neuroplasticity hypothesis. Ann N Y Acad Sci 2018; 1428:221-239. [PMID: 29741270 DOI: 10.1111/nyas.13665] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 02/06/2018] [Accepted: 02/13/2018] [Indexed: 12/21/2022]
Abstract
The obesity epidemic is a leading cause of health problems in the United States, increasing the risk of cardiovascular, endocrine, and psychiatric diseases. Although many people lose weight through changes in diet and lifestyle, keeping the weight off remains a challenge. Here, we discuss a hypothesis that seeks to explain why obesity is so persistent. There is a great degree of overlap in the circuits implicated in substance use disorder and obesity, and neural plasticity of these circuits in response to drugs of abuse is well documented. We hypothesize that obesity is also associated with neural plasticity in these circuits, and this may underlie persistent changes in behavior, energy balance, and body weight. Here, we discuss how obesity-associated reductions in motivation and physical activity may be rooted in neurophysiological alterations in these circuits. Such plasticity may alter how humans and animals use, expend, and store energy, even after weight loss.
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Affiliation(s)
- Bridget A Matikainen-Ankney
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Alexxai V Kravitz
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland.,National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland
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17
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Nazario LR, da Silva RS, Bonan CD. Targeting Adenosine Signaling in Parkinson's Disease: From Pharmacological to Non-pharmacological Approaches. Front Neurosci 2017; 11:658. [PMID: 29217998 PMCID: PMC5703841 DOI: 10.3389/fnins.2017.00658] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/10/2017] [Indexed: 12/29/2022] Open
Abstract
Parkinson's disease (PD) is one of the most prevalent neurodegenerative disease displaying negative impacts on both the health and social ability of patients and considerable economical costs. The classical anti-parkinsonian drugs based in dopaminergic replacement are the standard treatment, but several motor side effects emerge during long-term use. This mini-review presents the rationale to several efforts from pre-clinical and clinical studies using adenosine receptor antagonists as a non-dopaminergic therapy. As several studies have indicated that the monotherapy with adenosine receptor antagonists reaches limited efficacy, the usage as a co-adjuvant appeared to be a promising strategy. The formulation of multi-targeted drugs, using adenosine receptor antagonists and other neurotransmitter systems than the dopaminergic one as targets, have been receiving attention since Parkinson's disease presents a complex biological impact. While pharmacological approaches to cure or ameliorate the conditions of PD are the leading strategy in this area, emerging positive aspects have arisen from non-pharmacological approaches and adenosine function inhibition appears to improve both strategies.
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Affiliation(s)
- Luiza R Nazario
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rosane S da Silva
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Carla D Bonan
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
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18
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Impulsivity, Stimulant Abuse, and Dopamine Receptor Signaling. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2016; 76:67-84. [PMID: 27288074 DOI: 10.1016/bs.apha.2016.01.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The nonmedical use of amphetamine-type stimulants is a worldwide problem, with substantial medical and social consequences. Nonetheless, the identification of a pharmacological treatment for amphetamine use disorder remains elusive. Stimulant users exhibit neurochemical evidence of dopamine-system dysfunction as well as impulsive behaviors that may interfere with the success of treatments for their addiction. This review focuses on the potential role of dopaminergic neurotransmission in impulsivity, both in healthy individuals and chronic stimulant users who meet criteria for methamphetamine dependence. Presented are findings related to the potential contributions of signaling through dopamine D1- and D2-type receptors to self-control impulsivity in methamphetamine- dependent users. The information available points to signaling through striatal D2-type dopamine receptors as a potential therapeutic target for stimulant use disorders, but medications that target D2-type dopamine receptors have not been successful in treating stimulant-use disorders, possibly because D2-type receptors are downregulated. Other means to augment D2-type receptor signaling are therefore under consideration, and one promising approach is the addition of exercise training as an adjunct to behavioral treatment for addiction.
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19
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Herrera JJ, Fedynska S, Ghasem PR, Wieman T, Clark PJ, Gray N, Loetz E, Campeau S, Fleshner M, Greenwood BN. Neurochemical and behavioural indices of exercise reward are independent of exercise controllability. Eur J Neurosci 2016; 43:1190-202. [PMID: 26833814 DOI: 10.1111/ejn.13193] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 01/18/2016] [Accepted: 01/26/2016] [Indexed: 11/27/2022]
Abstract
Brain reward circuits are implicated in stress-related psychiatric disorders. Exercise reduces the incidence of stress-related disorders, but the contribution of exercise reward to stress resistance is unknown. Exercise-induced stress resistance is independent of exercise controllability; both voluntary running (VR) and forced running (FR) protect rats against the anxiety-like and depression-like behavioural consequences of stress. Voluntary exercise is a natural reward, but whether rats find FR rewarding is unknown. Moreover, the contribution of dopamine (DA) and striatal reward circuits to exercise reward is not well characterized. Adult, male rats were assigned to locked wheels, VR, or FR groups. FR rats were forced to run in a pattern resembling the natural wheel running behavior of rats. Both VR and FR increased the reward-related plasticity marker ΔFosB in the dorsal striatum and nucleus accumbens, and increased the activity of DA neurons in the lateral ventral tegmental area, as revealed by immunohistochemistry for tyrosine hydroxylase and pCREB. Both VR and FR rats developed conditioned place preference (CPP) to the side of a CPP chamber paired with exercise. Re-exposure to the exercise-paired side of the CPP chamber elicited conditioned increases in cfos mRNA in direct-pathway (dynorphin-positive) neurons in the dorsal striatum and nucleus accumbens in both VR and FR rats, and in tyrosine hydroxylase-positive neurons in the lateral ventral tegmental area of VR rats only. The results suggest that the rewarding effects of exercise are independent of exercise controllability and provide insight into the DA and striatal circuitries involved in exercise reward and exercise-induced stress resistance.
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Affiliation(s)
- Jonathan J Herrera
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - Sofiya Fedynska
- Department of Psychology, University of Colorado Denver, CB 173, PO Box 173364, Denver, 80217, CO, USA
| | - Parsa R Ghasem
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - Tyler Wieman
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - Peter J Clark
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - Nathan Gray
- Department of Psychology, University of Colorado Denver, CB 173, PO Box 173364, Denver, 80217, CO, USA
| | - Esteban Loetz
- Department of Psychology, University of Colorado Denver, CB 173, PO Box 173364, Denver, 80217, CO, USA
| | - Serge Campeau
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO, USA.,Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - Monika Fleshner
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.,Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - Benjamin N Greenwood
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.,Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
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20
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Abstract
This paper is the thirty-seventh consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2014 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (endogenous opioids and receptors), and the roles of these opioid peptides and receptors in pain and analgesia (pain and analgesia); stress and social status (human studies); tolerance and dependence (opioid mediation of other analgesic responses); learning and memory (stress and social status); eating and drinking (stress-induced analgesia); alcohol and drugs of abuse (emotional responses in opioid-mediated behaviors); sexual activity and hormones, pregnancy, development and endocrinology (opioid involvement in stress response regulation); mental illness and mood (tolerance and dependence); seizures and neurologic disorders (learning and memory); electrical-related activity and neurophysiology (opiates and conditioned place preferences (CPP)); general activity and locomotion (eating and drinking); gastrointestinal, renal and hepatic functions (alcohol and drugs of abuse); cardiovascular responses (opiates and ethanol); respiration and thermoregulation (opiates and THC); and immunological responses (opiates and stimulants). This paper is the thirty-seventh consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2014 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (endogenous opioids and receptors), and the roles of these opioid peptides and receptors in pain and analgesia (pain and analgesia); stress and social status (human studies); tolerance and dependence (opioid mediation of other analgesic responses); learning and memory (stress and social status); eating and drinking (stress-induced analgesia); alcohol and drugs of abuse (emotional responses in opioid-mediated behaviors); sexual activity and hormones, pregnancy, development and endocrinology (opioid involvement in stress response regulation); mental illness and mood (tolerance and dependence); seizures and neurologic disorders (learning and memory); electrical-related activity and neurophysiology (opiates and conditioned place preferences (CPP)); general activity and locomotion (eating and drinking); gastrointestinal, renal and hepatic functions (alcohol and drugs of abuse); cardiovascular responses (opiates and ethanol); respiration and thermoregulation (opiates and THC); and immunological responses (opiates and stimulants).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY 11367, United States.
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21
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Mika A, Bouchet CA, Bunker P, Hellwinkel JE, Spence KG, Day HEW, Campeau S, Fleshner M, Greenwood BN. Voluntary exercise during extinction of auditory fear conditioning reduces the relapse of fear associated with potentiated activity of striatal direct pathway neurons. Neurobiol Learn Mem 2015; 125:224-35. [PMID: 26454156 PMCID: PMC4648665 DOI: 10.1016/j.nlm.2015.10.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 09/22/2015] [Accepted: 10/01/2015] [Indexed: 12/22/2022]
Abstract
Relapse of previously extinguished fear presents a significant, pervasive obstacle to the successful long-term treatment of anxiety and trauma-related disorders. Thus, identification of a novel means to enhance fear extinction to stand the passage of time and generalize across contexts is of the utmost importance. Acute bouts of exercise can be used as inexpensive, noninvasive treatment strategies to reduce anxiety, and have been shown to enhance memory for extinction when performed in close temporal proximity to the extinction session. However, it is unclear whether acute exercise can be used to prevent relapse of fear, and the neural mechanisms underlying this potential effect are unknown. The current study therefore examined whether acute exercise during extinction of auditory fear can protect against the later relapse of fear. Male F344 rats lacking an extended history of wheel running were conditioned to fear a tone CS and subsequently extinguished within either a freely mobile running wheel, a locked wheel, or a control context lacking a wheel. Rats exposed to fear extinction within a freely mobile wheel ran during fear extinction, and demonstrated reduced fear as well as attenuated corticosterone levels during re-exposure to the extinguished CS during the relapse test in a novel context 1week later. Examination of cfos mRNA patterns elicited by re-exposure to the extinguished CS during the relapse test revealed that acute exercise during extinction decreased activation of brain circuits classically involved in driving fear expression and interestingly, increased activity within neurons of the direct striatal pathway involved in reward signaling. These data suggest that exercise during extinction reduces relapse through a mechanism involving the direct pathway of the striatum. It is suggested that a positive affective state could become associated with the CS during exercise during extinction, thus resulting in a relapse-resistant extinction memory.
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Affiliation(s)
- Agnieszka Mika
- Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, Boulder, CO 80309, United States; Center for Neuroscience, University of Colorado Boulder, UCB Boulder 80309, United States
| | - Courtney A Bouchet
- Department of Integrative Biology, University of Colorado Denver, Denver, CO 80217, United States
| | - Preston Bunker
- Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, Boulder, CO 80309, United States
| | - Justin E Hellwinkel
- Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, Boulder, CO 80309, United States
| | - Katie G Spence
- Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, Boulder, CO 80309, United States
| | - Heidi E W Day
- Department of Psychology and Neuroscience, University of Colorado Boulder, 345 UCB Boulder CO 80309, United States; Center for Neuroscience, University of Colorado Boulder, UCB Boulder 80309, United States
| | - Serge Campeau
- Department of Psychology and Neuroscience, University of Colorado Boulder, 345 UCB Boulder CO 80309, United States; Center for Neuroscience, University of Colorado Boulder, UCB Boulder 80309, United States
| | - Monika Fleshner
- Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, Boulder, CO 80309, United States; Center for Neuroscience, University of Colorado Boulder, UCB Boulder 80309, United States
| | - Benjamin N Greenwood
- Department of Psychology, University of Colorado Denver, CO 80217, United States.
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