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Bai YZ, Zhang SQ. Selenium intake is an effective strategy for the improvement of cognitive decline in low cognition older Americans. Int J Food Sci Nutr 2024:1-8. [PMID: 39034505 DOI: 10.1080/09637486.2024.2380758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 07/09/2024] [Indexed: 07/23/2024]
Abstract
Age-related cognitive decline is a prominent concern in older adults and selenium (Se) deficiency has been found to be associated with cognitive deficits. For the first time, the present study explored the association between Se intake and cognitive performance in older people with/without cognitive impairment using the data from the National Health and Nutrition Examination Survey 2011-2014. Weighted linear regression models were conducted to evaluate the association between dietary Se/total Se intakes and cognitive assessments. A total of 2387 participants were included. The significant positive association between dietary Se/total Se intakes and total scores of cognitive functioning tests existed only in the older people with low cognitive performance (p < 0.001), not in those with normal cognitive performance. In conclusion, Se intake was beneficial for cognitive decline only in the low cognition older people but failed in normal cognition older people.
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Affiliation(s)
- Ya-Zhi Bai
- Department of Nutrition and Metabolism, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Shuang-Qing Zhang
- Department of Nutrition and Metabolism, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, China
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2
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Sircar R. Behavioral changes and dendritic remodeling of hippocampal neurons in adolescent alcohol-treated rats. ADVANCES IN DRUG AND ALCOHOL RESEARCH 2023; 3:11158. [PMID: 38389817 PMCID: PMC10880782 DOI: 10.3389/adar.2023.11158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 05/18/2023] [Indexed: 02/24/2024]
Abstract
Objective: Earlier, we and others have reported that alcohol exposure in adolescent rat impaired performance of a spatial memory task in the Morris water maze. The goal of the present study was to investigate the effects of acute adolescent alcohol treatment on the hippocampus-dependent (contextual fear conditioning) and hippocampus-independent (cued fear) memories. The study also looked at the structural changes in anterior CA1 hippocampal neurons in adolescent alcohol-treated rats. Methods: Adolescent female rats were administered with a single dose of alcohol (1.0, 1.5, or 2.0 g/kg) or vehicle either before training (pre-training) or after training (pre-testing). Experimental and control rats were trained in the fear conditioning paradigm, and 24 h later tested for both contextual fear conditioning as well as cued fear memory. Separate groups of rats were treated with either alcohol (2 g/kg) or vehicle and sacrificed 24 h later. Their brains were harvested and processed for rapid Golgi staining. Randomly selected CA1 pyramidal neurons were analyzed for dendritic branching and dendritic spine density. Results: Pre-training alcohol dose-dependently attenuated acquisition of hippocampus-dependent contextual fear conditioning but had no effect on the acquisition of amygdala-associated cued fear. When administered following training (pre-testing), alcohol did not alter either contextual conditioning or cued fear memory. Golgi stained CA1 pyramidal neurons in alcohol treated female rats had reduced basilar tree branching and less complex dendritic arborization. Conclusion: Alcohol specifically impaired hippocampal learning in adolescent rats but not amygdala-associated cued fear memory. Compared to vehicle-treated rats, CA1 hippocampal pyramidal neurons in alcohol-treated rats had less complex dendritic morphology. Together, these data suggest that adolescent alcohol exposure produces changes in the neuronal organization of the hippocampus, and these changes may be related to impairments in hippocampus-dependent memory formation.
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Affiliation(s)
- Ratna Sircar
- Department of Psychology, The City College of New York, City University of New York, New York, NY, United States
- Department of Psychiatry and Behavioral Sciences, Albert Einstein College of Medicine, Bronx, NY, United States
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Young CK, McNaughton N. Mixed Effects of Low-dose Ethanol on Cortical and Hippocampal Theta Oscillations. Neuroscience 2020; 429:213-224. [DOI: 10.1016/j.neuroscience.2020.01.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 01/02/2020] [Accepted: 01/06/2020] [Indexed: 12/14/2022]
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Van Skike CE, Goodlett C, Matthews DB. Acute alcohol and cognition: Remembering what it causes us to forget. Alcohol 2019; 79:105-125. [PMID: 30981807 DOI: 10.1016/j.alcohol.2019.03.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Revised: 03/14/2019] [Accepted: 03/18/2019] [Indexed: 12/17/2022]
Abstract
Addiction has been conceptualized as a specific form of memory that appropriates typically adaptive neural mechanisms of learning to produce the progressive spiral of drug-seeking and drug-taking behavior, perpetuating the path to addiction through aberrant processes of drug-related learning and memory. From that perspective, to understand the development of alcohol use disorders, it is critical to identify how a single exposure to alcohol enters into or alters the processes of learning and memory, so that involvement of and changes in neuroplasticity processes responsible for learning and memory can be identified early. This review characterizes the effects produced by acute alcohol intoxication as a function of brain region and memory neurocircuitry. In general, exposure to ethanol doses that produce intoxicating effects causes consistent impairments in learning and memory processes mediated by specific brain circuitry, whereas lower doses either have no effect or produce a facilitation of memory under certain task conditions. Therefore, acute ethanol does not produce a global impairment of learning and memory, and can actually facilitate particular types of memory, perhaps particular types of memory that facilitate the development of excessive alcohol use. In addition, the effects on cognition are dependent on brain region, task demands, dose received, pharmacokinetics, and tolerance. Additionally, we explore the underlying alterations in neurophysiology produced by acute alcohol exposure that help to explain these changes in cognition and highlight future directions for research. Through understanding the impact that acute alcohol intoxication has on cognition, the preliminary changes potentially causing a problematic addiction memory can better be identified.
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Affiliation(s)
- Candice E Van Skike
- Department of Cellular and Integrative Physiology and The Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78245, United States
| | - Charles Goodlett
- Department of Psychology, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46202, United States
| | - Douglas B Matthews
- Division of Psychology, University of Wisconsin - Eau Claire, Eau Claire, WI, 54702, United States.
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5
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Abstract
Compulsion and impulsivity are both primary features of drug addiction. Based on decades of animal research, we have a detailed understanding of the factors (both environmental and physiological) that influence compulsive drug use, but still know relatively little about the impulsive aspects of drug addiction. This review outlines our current knowledge of the relationship between impulsivity and drug addiction, focusing on cognitive and motor impulsivity, which are particularly relevant to this disorder. Topics to be discussed include the influence of chronic drug administration on impulsivity, the mechanisms that may explain drug-induced impulsivity, and the role of individual differences in the development of impulsive drug use. In addition, the manner in which contemporary theories of drug addiction conceptualize the relationship between impulsivity and compulsion is examined. Most importantly, this review emphasizes a critical role for animal research in understanding the role of impulsivity in the development and maintenance of drug addiction.
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Affiliation(s)
- Mary C Olmstead
- Department of Psychology, Queen's University, Kingston, Ontario, Canada.
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6
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Gawel K, Labuz K, Gibula-Bruzda E, Jenda M, Marszalek-Grabska M, Filarowska J, Silberring J, Kotlinska JH. Cholinesterase inhibitors, donepezil and rivastigmine, attenuate spatial memory and cognitive flexibility impairment induced by acute ethanol in the Barnes maze task in rats. Naunyn Schmiedebergs Arch Pharmacol 2016; 389:1059-71. [PMID: 27376896 PMCID: PMC5021718 DOI: 10.1007/s00210-016-1269-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 06/20/2016] [Indexed: 12/11/2022]
Abstract
Central cholinergic dysfunction contributes to acute spatial memory deficits produced by ethanol administration. Donepezil and rivastigmine elevate acetylcholine levels in the synaptic cleft through the inhibition of cholinesterases—enzymes involved in acetylcholine degradation. The aim of our study was to reveal whether donepezil (acetylcholinesterase inhibitor) and rivastigmine (also butyrylcholinesterase inhibitor) attenuate spatial memory impairment as induced by acute ethanol administration in the Barnes maze task (primary latency and number of errors in finding the escape box) in rats. Additionally, we compared the influence of these drugs on ethanol-disturbed memory. In the first experiment, the dose of ethanol (1.75 g/kg, i.p.) was selected that impaired spatial memory, but did not induce motor impairment. Next, we studied the influence of donepezil (1 and 3 mg/kg, i.p.), as well as rivastigmine (0.5 and 1 mg/kg, i.p.), given either before the probe trial or the reversal learning on ethanol-induced memory impairment. Our study demonstrated that these drugs, when given before the probe trial, were equally effective in attenuating ethanol-induced impairment in both test situations, whereas rivastigmine, at both doses (0.5 and 1 mg/kg, i.p.), and donepezil only at a higher dose (3 mg/kg, i.p.) given prior the reversal learning, attenuated the ethanol-induced impairment in cognitive flexibility. Thus, rivastigmine appears to exert more beneficial effect than donepezil in reversing ethanol-induced cognitive impairments—probably due to its wider spectrum of activity. In conclusion, the ethanol-induced spatial memory impairment may be attenuated by pharmacological manipulation of central cholinergic neurotransmission.
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Affiliation(s)
- Kinga Gawel
- Department of Pharmacology and Pharmacodynamics, Medical University, Chodzki 4A, 20-093, Lublin, Poland
| | | | - Ewa Gibula-Bruzda
- Department of Pharmacology and Pharmacodynamics, Medical University, Chodzki 4A, 20-093, Lublin, Poland
| | - Malgorzata Jenda
- Department of Pharmacology and Pharmacodynamics, Medical University, Chodzki 4A, 20-093, Lublin, Poland
| | - Marta Marszalek-Grabska
- Department of Pharmacology and Pharmacodynamics, Medical University, Chodzki 4A, 20-093, Lublin, Poland
| | - Joanna Filarowska
- Department of Pharmacology and Pharmacodynamics, Medical University, Chodzki 4A, 20-093, Lublin, Poland
| | - Jerzy Silberring
- Department of Biochemistry and Neurobiology, AGH University of Science and Technology, Mickiewicza 30, 30-059, Krakow, Poland
| | - Jolanta H Kotlinska
- Department of Pharmacology and Pharmacodynamics, Medical University, Chodzki 4A, 20-093, Lublin, Poland.
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Liu Z, Yang Y, Shi Z, Liu J, Wang Y. The risk of male adult alcohol dependence: The role of the adverse childhood experiences and ecological executive function. Compr Psychiatry 2016; 68:129-33. [PMID: 27234193 DOI: 10.1016/j.comppsych.2016.04.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 04/05/2016] [Accepted: 04/05/2016] [Indexed: 10/22/2022] Open
Abstract
OBJECTIVE To explore the association between male adult alcohol dependence and their adverse childhood experiences as well as ecological executive function. METHODS The questionnaires of Adverse Childhood Experiences (ACEs) and Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) were adopted for the assessments of 102 alcohol dependent patients who were diagnosed according to the criteria defined by the International Classification of diseases and related health problems (ICD-10) and 106 healthy volunteers, and the differences between patients and healthy volunteers were analyzed. RESULTS The percentage of adverse childhood experiences in alcohol dependent patients was significantly higher than that in healthy volunteers (χ(2)=17.28, P<0.01); and the incidences of emotional abuse, physical neglect, violence witness, and substance abuse were significantly higher in alcohol dependent patients than those in healthy volunteers (χ(2)=4.59, 4.46, 10.51, and 44.09 respectively; P<0.05). The ecological executive function analysis showed that the BRIEF total score and scores for each item were all significantly higher in alcohol dependent patients than those of healthy volunteers (P<0.01). CONCLUSIONS The adult alcohol dependence was associated with their adverse childhood experiences and ecological executive function. Then physical neglect and substance abuse of parents in childhood, and emotional control defect in the ecological executive function showed strong association with adult alcohol dependence.
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Affiliation(s)
- Zengxun Liu
- Department of Psychiatry, Shandong University School of Medicine, No. 44 Wenhua Xi Road, Jinan, 250012, Shandong, China; Department of Psychiatry, Shandong Mental Health Center, Jinan, 250014, Shandong, China
| | - Ying Yang
- Department of Psychiatry, Shandong University School of Medicine, No. 44 Wenhua Xi Road, Jinan, 250012, Shandong, China; Department of Psychiatry, Shandong Mental Health Center, Jinan, 250014, Shandong, China
| | - Zhenchun Shi
- Department of Psychiatry, Shandong Mental Health Center, Jinan, 250014, Shandong, China
| | - Jintong Liu
- Department of Psychiatry, Shandong University School of Medicine, No. 44 Wenhua Xi Road, Jinan, 250012, Shandong, China.
| | - Yang Wang
- Department of Psychiatry, Shandong University School of Medicine, No. 44 Wenhua Xi Road, Jinan, 250012, Shandong, China.
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Cacace S, Plescia F, La Barbera M, Cannizzaro C. Evaluation of chronic alcohol self-administration by a 3-bottle choice paradigm in adult male rats. Effects on behavioural reactivity, spatial learning and reference memory. Behav Brain Res 2011; 219:213-20. [DOI: 10.1016/j.bbr.2011.01.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Revised: 12/30/2010] [Accepted: 01/10/2011] [Indexed: 11/30/2022]
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Anstey KJ, Mack HA, Cherbuin N. Alcohol consumption as a risk factor for dementia and cognitive decline: meta-analysis of prospective studies. Am J Geriatr Psychiatry 2009; 17:542-55. [PMID: 19546653 DOI: 10.1097/jgp.0b013e3181a2fd07] [Citation(s) in RCA: 277] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The relationships between alcohol consumption and dementia and cognitive decline were investigated in a systematic review including meta-analyses of 15 prospective studies. Follow-ups ranged from 2 to 8 years. Meta-analyses were conducted on samples including 14,646 participants evaluated for Alzheimer disease (AD), 10,225 participants evaluated for vascular dementia (VaD), and 11,875 followed for any type of dementia (Any dementia). The pooled relative risks (RRs) of AD, VaD, and Any dementia for light to moderate drinkers compared with nondrinkers were 0.72 (95% CI = 0.61-0.86), 0.75 (95% CI = 0.57-0.98), and 0.74 (95% CI = 0.61-0.91), respectively. When the more generally classified "drinkers," were compared with "nondrinkers," they had a reduced risk of AD (RR = 0.66, 95% CI = 0.47-0.94) and Any dementia (RR = 0.53, 95% CI = 0.53-0.82) but not cognitive decline. There were not enough data to examine VaD risk among "drinkers." Those classified as heavy drinkers did not have an increased risk of Any dementia compared with nondrinkers, but this may reflect sampling bias. Our results suggest that alcohol drinkers in late life have reduced risk of dementia. It is unclear whether this reflects selection effects in cohort studies commencing in late life, a protective effect of alcohol consumption throughout adulthood, or a specific benefit of alcohol in late life.
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Affiliation(s)
- Kaarin J Anstey
- Centre for Mental Health Research, Australian National University, Canberra, Australia
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10
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Repeated ethanol exposure affects the acquisition of spatial memory in adolescent female rats. Behav Brain Res 2009; 202:225-31. [PMID: 19463705 DOI: 10.1016/j.bbr.2009.03.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2008] [Revised: 02/19/2009] [Accepted: 03/28/2009] [Indexed: 01/29/2023]
Abstract
Ethanol has been reported to disrupt spatial learning and memory in adolescent male rats. The present study was undertaken to determine the effects of ethanol on the acquisition of spatial memory in adolescent female rats. Adolescent female rats were subjected to repeated ethanol or saline treatments, and spatial learning was tested in the Morris water maze. For comparison, adult female rats were subjected to similar ethanol treatment and behavioral assessments as for adolescent rats. Ethanol-treated adolescent rats took longer and swam greater distances to find the hidden platform than saline controls. In the probe trial, ethanol-treated adolescent rats showed a trend towards reduced time spent in the target quadrant, and made significantly fewer target location crossings than saline-treated controls. Adult saline-treated control rats did not learn the spatial memory task as well as the adolescent saline-treated rats. Although ethanol in adult rats increased both latency and swim distance to find the platform, in the probe trial there was no difference between ethanol-treated adult rats and age-matched saline controls. Ethanol did not alter swim speed or performance in the cued visual task at either age. Together, these data suggest that ethanol specifically impairs the acquisition of spatial memory in adolescent female rats. Since adult females did not learn the task, ethanol-induced alterations in water maze performance may not reflect true learning and memory dysfunction.
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12
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Kameda SR, Frussa-Filho R, Carvalho RC, Takatsu-Coleman AL, Ricardo VP, Patti CL, Calzavara MB, Lopez GB, Araujo NP, Abílio VC, Ribeiro RDA, D'Almeida V, Silva RH. Dissociation of the effects of ethanol on memory, anxiety, and motor behavior in mice tested in the plus-maze discriminative avoidance task. Psychopharmacology (Berl) 2007; 192:39-48. [PMID: 17242924 DOI: 10.1007/s00213-006-0684-9] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Accepted: 12/18/2006] [Indexed: 10/23/2022]
Abstract
RATIONALE Several studies have shown the amnestic effects of ethanol (ETOH). However, while memory tasks in rodents can be markedly influenced by anxiety-like behavior and motor function, ETOH induces anxiolysis and different effects on locomotion, depending on the dose. OBJECTIVE Verify the effects of ETOH in mice tested in the plus-maze discriminative avoidance task (PMDAT) concomitantly evaluating memory, anxiety-like behavior, and motor behavior. METHODS ETOH acutely or repeatedly treated mice were submitted to the training session in a modified elevated plus-maze with two open and two enclosed arms, aversive stimuli in one of the enclosed arms, and tested 24 h later without aversive stimuli. Learning/memory, locomotion, and anxiety-related behavior were evaluated by aversive arm exploration, number of entries in all the arms and open arms exploration, respectively. RESULTS Acute ETOH: (1) either increased (1.2-1.8 g/kg) or decreased (3.0 g/kg) locomotion; (2) decreased anxiety levels (1.2-3.0 g/kg); and (3) induced learning deficits (1.2-3.0 g/kg) and memory deficits (0.3-3.0 g/kg). After repeated treatment, sensitization and tolerance to hyperlocomotion and anxiolysis induced by 1.8 g/kg ETOH were observed, respectively, and tolerance to the amnestic effect of 0.6 (but not 1.8) g/kg ETOH occurred. CONCLUSION Neither the anxiolytic nor the locomotor effects of ETOH seem to be related to its amnestic effect in the PMDAT. Additionally, data give support to the effectiveness of the PMDAT in simultaneously evaluating learning, memory, anxiety-like behavior, and motor activity by different parameters. Possible relationships between the behavioral alterations found are discussed.
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Affiliation(s)
- S R Kameda
- Departamento de Pediatria, Universidade Federal de São Paulo, São Paulo, Brazil
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Olmstead MC, Hellemans KGC, Paine TA. Alcohol-induced impulsivity in rats: an effect of cue salience? Psychopharmacology (Berl) 2006; 184:221-8. [PMID: 16378218 DOI: 10.1007/s00213-005-0215-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2005] [Accepted: 09/20/2005] [Indexed: 10/25/2022]
Abstract
RATIONALE There is a common assumption that alcohol produces impulsive behaviors, thereby increasing the preference for immediate over delayed rewards. An alternative explanation, provided by alcohol myopia theory, is that alcohol alters attentional processes such that intoxicated individuals respond exclusively to the most salient cues in their environment. OBJECTIVES We tested these two hypotheses in rats using standard (impulsivity) and modified (cue salience) versions of the delayed reinforcement task. METHODS In the impulsivity paradigm, rats were trained to choose between a small immediate reward (2 sucrose pellets) and a large delayed reward (12 sucrose pellets after 10 s) in a T-maze. In the cue salience paradigm, a light in one arm predicted either the small or the large reward, but the arm paired with the light varied across trials. In separate experiments, we examined how changes in delay to the large reward, alcohol administration, or alcohol combined with either a serotonin agonist [para-chloroamphetamine (pCA) at doses of 0.1, 0.4, 0.7, and 1.0 mg/kg, s.c.)] or a dopamine antagonist [cis-(Z)-flupenthixol dihydrochloride (alpha-flupenthixol) at doses of 0.0125, 0.025, 0.05, and 0.1 mg/kg, i.p.] affected performance in each task. RESULTS Increasing the delay to the large reward increased impulsivity in both paradigms, but it had no effect on responding to a salient cue. Alcohol (0.6, 0.9, 1.2, and 1.8 g/kg, i.p.) increased the choice of the immediate reward and increased the choice of the lit arm, regardless of whether it signaled the small or the large reward. pCA selectively reduced alcohol-induced impulsivity, whereas alpha-flupenthixol selectively reduced responding to a salient cue. CONCLUSIONS Rats, like humans, are influenced by cue salience when intoxicated. Although this alcohol myopia effect could explain alcohol-induced impulsivity, the two processes are probably distinct because they are mediated by dissociable pharmacological mechanisms.
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Affiliation(s)
- Mary C Olmstead
- Department of Psychology, Queen's University, 62 Arch Street, Kingston, ON, Canada, K7L 3N6.
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Escher T, Mittleman G. Effects of ethanol and GABAB drugs on working memory in C57BL/6J and DBA/2J mice. Psychopharmacology (Berl) 2004; 176:166-74. [PMID: 15064920 DOI: 10.1007/s00213-004-1875-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2004] [Accepted: 03/08/2004] [Indexed: 11/30/2022]
Abstract
RATIONALE It has been suggested that GABA(B) receptors may be part of a neural substrate mediating some of the effects of ethanol. OBJECTIVE The purpose of this experiment was to investigate, in mice, the effects of ethanol on working memory in a delayed matching-to position (DMTP) task, and additionally to determine if these effects were modulated by GABA(B) receptors. METHODS Female C57BL/6J and DBA/2J mice were trained in the DMTP task, and after asymptotic levels of performance accuracy were achieved, injections (IP) of ethanol, baclofen, or phaclofen were administered. Baclofen or phaclofen were then co-administered with ethanol. Each test was repeated twice. RESULTS Ethanol caused deficits in working memory at 2.0 g/kg and higher. The highest dose (2.5 g/kg) produced additional non-specific effects, indicative of sedation. Baclofen increased performance accuracy (2.5 mg/kg), while decreasing the total number of trials completed. When combined with ethanol (1.5 g/kg), baclofen increased memory deficits at the highest dose (7.5 mg/kg). Phaclofen increased performance accuracy at 10 and 30 mg/kg but had no effect on the total number of trials completed. When combined with ethanol (2.5 g/kg), phaclofen did not significantly alter ethanol-induced deficits in performance. CONCLUSIONS Analyses of performance accuracy, total trials completed and variables indexing bias and motor impairment indicated that GABA(B) drugs modulate working memory in a behaviorally specific manner. Overall, these receptors may be part of a neural substrate that modulates some of the effects of ethanol.
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Affiliation(s)
- T Escher
- Department of Psychology, University of Memphis, Memphis, TN 38152, USA
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Ivester P, Shively CA, Register TC, Grant KA, Reboussin DM, Cunningham CC. The effects of moderate ethanol consumption on the liver of the monkey, Macaca fascicularis. Alcohol Clin Exp Res 2004; 27:1831-7. [PMID: 14634501 DOI: 10.1097/01.alc.0000095633.26284.fa] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Although evidence has accumulated for the cardioprotective effects of moderate ethanol consumption, little is known about the effects on the liver of consuming the equivalent of two drinks per day. The objective of this study was to determine the effects of moderate ethanol administration on the hepatic content of enzymes involved in ethanol oxidation, on hepatic lipid accumulation, and on serum markers of liver function/damage in the monkey, Macaca fascicularis. METHODS Ovariectomized, adult monkeys were maintained for 34 months on an atherogenic diet containing cholesterol 1.21 mg/kJ. They were trained to drink ethanol plus vehicle at a dose of 0.5 g/kg body weight, which was administered 5 days a week for 2 years. Blood was collected for ethanol concentrations (1 hr after ethanol administration) and was also assayed for gamma-glutamyltransferase, alanine aminotransferase (ALT), and alkaline phosphatase (ALP) activities. Liver obtained at necropsy was analyzed for triglyceride and cholesterol contents and for alcohol dehydrogenase, cytochrome P450 2E1, and cytochrome P450 3A4 by Western blots. RESULTS The blood ethanol concentrations measured 1 hr after ethanol administration were relatively constant over the 2-year dosing period. Hepatic levels of alcohol dehydrogenase and the cytochrome P450s were not significantly different between ethanol-consuming animals and control animals. Ethanol-associated increases in liver triglyceride were not significant due to high variability in hepatic lipid content in both the controls and ethanol consumers. However, covariance analyses using pretreatment concentrations of plasma cholesterol and apolipoprotein A-I suggested that the ethanol-related increase in hepatic free cholesterol was significant. Relative to controls, alcohol consumers had higher levels of serum ALT and a transient increase in ALP at 5 months. CONCLUSIONS The observations made in this study on primates administered an atherogenic diet suggest that moderate ethanol ingestion has modest effects on the liver, including slightly increased ALT and ALP values. However, additional studies will be required to verify that this level of consumption is hepatotoxic when ingested over extended periods. This is still a concern because some human studies suggest that levels of ethanol considered to be cardioprotective cause liver injury when consumed over a lifetime.
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Affiliation(s)
- Priscilla Ivester
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1016, USA
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Stancampiano R, Carta M, Cocco S, Curreli R, Rossetti ZL, Fadda F. Biphasic effects of ethanol on acetylcholine release in the rat prefrontal cortex. Brain Res 2004; 997:128-32. [PMID: 14715158 DOI: 10.1016/j.brainres.2003.09.078] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Low doses of ethanol (0.5 g/kg i.p.) increased, while higher doses (1 g/kg i.p.) reduced acetylcholine (ACh) release in the rat prefrontal cortex (PFC). Ethanol (50-300 mM) applied in the nucleus basalis through a second dialysis probe caused concentration-dependent biphasic changes in prefrontocortical ACh release. Ethanol apparently acts on cholinergic fibers to modulate ACh transmission in the PFC. These results could be of relevance for the bidirectional modulation of working memory by ethanol.
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Affiliation(s)
- Roberto Stancampiano
- Department of Applied Sciences for Biosystems, Division of Human Physiology, Via Porcell 4, I-09124 Cagliari, Italy
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Carta M, Ariwodola OJ, Weiner JL, Valenzuela CF. Alcohol potently inhibits the kainate receptor-dependent excitatory drive of hippocampal interneurons. Proc Natl Acad Sci U S A 2003; 100:6813-8. [PMID: 12732711 PMCID: PMC164529 DOI: 10.1073/pnas.1137276100] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Kainate receptors (KA-Rs) are members of the glutamate-gated family of ionotropic receptors, which also includes N-methyl-d-aspartate (NMDA) and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA) receptors. KA-Rs are important modulators of interneuron excitability in the CA1 region of the hippocampus. Activation of these receptors enhances interneuron firing, which robustly increases spontaneous inhibitory postsynaptic currents in pyramidal neurons. We report here that ethanol (EtOH) potently inhibits this KA-R-mediated effect at concentrations as low as those that can be achieved in blood after the ingestion of just 1-2 drinks (5-10 mM). Pressure application of kainate, in the presence of AMPA and NMDA receptor antagonists, evoked depolarizing responses in interneurons that triggered repetitive action potential firing. EtOH potently inhibited these responses to a degree that was sufficient to abolish action potential firing. This effect appears to be specific for KA-Rs, as EtOH did not affect action potential firing triggered by AMPA receptor-mediated depolarizing responses. Importantly, EtOH inhibited interneuron action potential firing in response to KA-R activation by synaptically released glutamate, suggesting that our findings are physiologically relevant. KA-R-dependent modulation of glutamate release onto pyramidal neurons was not affected by EtOH. Thus, EtOH increases excitability of pyramidal neurons indirectly by inhibiting the KA-R-dependent drive of gamma-aminobutyric acid (GABA)ergic interneurons. We postulate that this effect may explain, in part, some of the paradoxical excitatory actions of this widely abused substance. The excitatory actions of EtOH may be perceived as positive by some individuals, which could contribute to the development of alcoholism.
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Affiliation(s)
- Mario Carta
- Department of Neurosciences, University of New Mexico Health Sciences Center, Albuquerque 87131, USA
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Matthews DB, Morrow AL, Tokunaga S, McDaniel JR. Acute Ethanol Administration and Acute Allopregnanolone Administration Impair Spatial Memory in the Morris Water Task. Alcohol Clin Exp Res 2002. [DOI: 10.1111/j.1530-0277.2002.tb02479.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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