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Jafari-Sabet M, Amiri S, Sheibani M, Fatahi N, Aghamiri H. Cross state-dependent memory retrieval between tramadol and ethanol: involvement of dorsal hippocampal GABAA receptors. Psychopharmacology (Berl) 2024; 241:139-152. [PMID: 37758936 DOI: 10.1007/s00213-023-06469-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
RATIONALE Tramadol and ethanol, as psychoactive agents, are often abused. Discovering the molecular pathways of drug-induced memory creation may contribute to preventing drug addiction and relapse. OBJECTIVE The tramadol- and ethanol-induced state-dependent memory (SDM) and cross-SDM retrieval between tramadol and ethanol were examined in this study. Moreover, because of the confirmed involvement of GABAA receptors and GABAergic neurotransmission in memory retrieval impairment, we assessed cross-SDM retrieval between tramadol and ethanol with a specific emphasis on the role of the GABAA receptors. The first hypothesis of this study was the presence of cross-SDM between tramadol and ethanol, and the second hypothesis was related to possible role of GABAA receptors in memory retrieval impairment within the dorsal hippocampus. The cannulae were inserted into the hippocampal CA1 area of NMRI mice, and a step-down inhibitory avoidance test was used to evaluate state dependence and memory recovery. RESULTS The post-training and/or pre-test administration of tramadol (2.5 and 5 mg/kg, i.p.) and/or ethanol (0.5 and 1 g/kg, i.p.) induced amnesia, which was restored after the administration of the drugs 24 h later during the pre-test period, proposing ethanol and tramadol SDM. The pre-test injection of ethanol (0.25 and 0.5 g/kg, i.p.) with tramadol at an ineffective dose (1.25 mg/kg) enhanced tramadol SDM. Moreover, tramadol injection (1.25 and 2.5 mg/kg) with ethanol at the ineffective dose (0.25 g/kg) promoted ethanol SDM. Furthermore, the pre-test intra-CA1 injection of bicuculline (0.0625, 0.125, and 0.25 μg/mouse), a GABAA receptor antagonist, 5 min before the injection of tramadol (5 mg/kg) or ethanol (1 g/kg) inhibited tramadol- and ethanol-induced SDM dose-dependently. CONCLUSION The findings strongly confirmed cross-SDM between tramadol and ethanol and the critical role of dorsal hippocampal GABAA receptors in the cross-SDM between tramadol and ethanol.
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Affiliation(s)
- Majid Jafari-Sabet
- Razi Drug Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Shiva Amiri
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Sheibani
- Razi Drug Research Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Navid Fatahi
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Helia Aghamiri
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
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Iannucci J, O’Neill K, Wang X, Mukherjee S, Wang J, Shapiro LA. Sex-Specific and Traumatic Brain Injury Effects on Dopamine Receptor Expression in the Hippocampus. Int J Mol Sci 2023; 24:16084. [PMID: 38003274 PMCID: PMC10671736 DOI: 10.3390/ijms242216084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 10/26/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023] Open
Abstract
Traumatic brain injury (TBI) is a major health concern. Each year, over 50 million individuals worldwide suffer from TBI, and this leads to a number of acute and chronic health issues. These include affective and cognitive impairment, as well as an increased risk of alcohol and drug use. The dopaminergic system, a key component of reward circuitry, has been linked to alcohol and other substance use disorders, and previous research indicates that TBI can induce plasticity within this system. Understanding how TBI modifies the dopaminergic system may offer insights into the heightened substance use and reward-seeking behavior following TBI. The hippocampus, a critical component of the reward circuit, is responsible for encoding and integrating the spatial and salient aspects of rewarding stimuli. This study explored TBI-related changes in neuronal D2 receptor expression within the hippocampus, examining the hypothesis that sex differences exist in both baseline hippocampal D2 receptor expression and its response to TBI. Utilizing D2-expressing tdTomato transgenic male and female mice, we implemented either a sham injury or the lateral fluid percussion injury (FPI) model of TBI and subsequently performed a region-specific quantification of D2 expression in the hippocampus. The results show that male mice exhibit higher baseline hippocampal D2 expression compared to female mice. Additionally, there was a significant interaction effect between sex and injury on the expression of D2 in the hippocampus, particularly in regions of the dentate gyrus. Furthermore, TBI led to significant reductions in hippocampal D2 expression in male mice, while female mice remained mostly unaffected. These results suggest that hippocampal D2 expression varies between male and female mice, with the female dopaminergic system demonstrating less susceptibility to TBI-induced plasticity.
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Affiliation(s)
- Jaclyn Iannucci
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University School of Medicine, Bryan, TX 77807, USA; (J.I.)
| | - Katherine O’Neill
- Department of Biological Science, Texas A&M University, College Station, TX 77843, USA
| | - Xuehua Wang
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University School of Medicine, Bryan, TX 77807, USA; (J.I.)
| | - Sanjib Mukherjee
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University School of Medicine, Bryan, TX 77807, USA; (J.I.)
| | - Jun Wang
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University School of Medicine, Bryan, TX 77807, USA; (J.I.)
| | - Lee A. Shapiro
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University School of Medicine, Bryan, TX 77807, USA; (J.I.)
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Rezayof A, Ghasemzadeh Z, Sahafi OH. Addictive drugs modify neurogenesis, synaptogenesis and synaptic plasticity to impair memory formation through neurotransmitter imbalances and signaling dysfunction. Neurochem Int 2023; 169:105572. [PMID: 37423274 DOI: 10.1016/j.neuint.2023.105572] [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: 04/19/2023] [Revised: 07/01/2023] [Accepted: 07/05/2023] [Indexed: 07/11/2023]
Abstract
Drug abuse changes neurophysiological functions at multiple cellular and molecular levels in the addicted brain. Well-supported scientific evidence suggests that drugs negatively affect memory formation, decision-making and inhibition, and emotional and cognitive behaviors. The mesocorticolimbic brain regions are involved in reward-related learning and habitual drug-seeking/taking behaviors to develop physiological and psychological dependence on the drugs. This review highlights the importance of specific drug-induced chemical imbalances resulting in memory impairment through various neurotransmitter receptor-mediated signaling pathways. The mesocorticolimbic modifications in the expression levels of brain-derived neurotrophic factor (BDNF) and the cAMP-response element binding protein (CREB) impair reward-related memory formation following drug abuse. The contributions of protein kinases and microRNAs (miRNAs), along with the transcriptional and epigenetic regulation have also been considered in memory impairment underlying drug addiction. Overall, we integrate the research on various types of drug-induced memory impairment in distinguished brain regions and provide a comprehensive review with clinical implications addressing the upcoming studies.
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Affiliation(s)
- Ameneh Rezayof
- Department of Animal Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran.
| | - Zahra Ghasemzadeh
- Department of Animal Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - Oveis Hosseinzadeh Sahafi
- Department of Neurophysiology, Graduate School of Medicine, The University of Tokyo, Tokyo, 113-0033, Japan
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Zarrindast MR, Khakpai F. State-dependent memory and its modulation by different brain areas and neurotransmitters. EXCLI JOURNAL 2020; 19:1081-1099. [PMID: 33013265 PMCID: PMC7527511 DOI: 10.17179/excli2020-2612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 07/27/2020] [Indexed: 11/10/2022]
Abstract
The state-dependent memory defines as a state that the retrieval of recently obtained information may be potential if the subject exists in a similar physiological situation as for the period of the encoding stage. Studies revealed that exogenous and endogenous compounds could induce state-dependent memory. The state-dependent memory made it probable to differentiate the effects of drugs per se on learning from the effects due to alterations in drug state during the task. Studies proposed the role of regions beyond the limbic formation and illustrated that state-dependent memory produced by various neurotransmitter systems and pharmacological compounds. Our review of the literature revealed that: (a) re-administration of drugs on the same state induce state-dependent memory; (b) many neurotransmitters induce endogenous state-dependent memory; (c) there are cross state-dependent learning and memory between some drugs; (d) some sites of the brain including the CA1 areas of the hippocampus, central nucleus of the amygdala (CeA), septum, ventral tegmental area (VTA), and nucleus accumbens (NAC) are involved in state-dependent memory. See also Figure 1(Fig. 1).
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Affiliation(s)
- Mohammad-Reza Zarrindast
- Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.,Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Khakpai
- Cognitive and Neuroscience Research Center (CNRC), Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
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Garibbo M, Aylward J, Robinson OJ. The impact of threat of shock-induced anxiety on the neural substrates of memory encoding and retrieval. Soc Cogn Affect Neurosci 2020; 14:1087-1096. [PMID: 31680142 PMCID: PMC6970151 DOI: 10.1093/scan/nsz080] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 07/23/2019] [Accepted: 09/09/2019] [Indexed: 12/21/2022] Open
Abstract
Dysfunctional memory processes are widely reported in anxiety disorders, but the underlying neurocognitive mechanisms are unclear. Recent work shows that the impact of anxiety on memory depends on the context and memory modality. For instance, threat of shock, a translational within-subject anxiety induction, has been shown to impair the encoding of facial stimuli, while improving spatial working memory (WM) accuracy. The present study aimed to delineate the neural circuitry regulating these opposing behavioural effects. Thirty-three healthy volunteers performed the previously assessed facial recognition and a spatial WM tasks inside an fMRI scanner, under alternating within-subject conditions of threat or safe from shock across encoding and retrieval. Facial recognition impairments were replicated when threat was selectively induced at encoding. Neuroimaging results suggest that this effect was driven by increased competition for attentional resources within the anterior cingulate cortex, in which activation correlated positively with stress levels. The impact of threat on spatial WM performance did not, however, replicate in the fMRI environment. Nevertheless, state-dependent hippocampal activation was observed in both tasks. These findings suggest a neurocognitive mechanism by which anxiety impairs facial recognition as well as a state-dependent hippocampal activation pattern, which may putatively underline retrieval of negative experiences in anxiety.
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Affiliation(s)
- Michele Garibbo
- Institute of Cognitive Neuroscience, University College London, WC1N 3AZ, London, United Kingdom
| | - Jessica Aylward
- Institute of Cognitive Neuroscience, University College London, WC1N 3AZ, London, United Kingdom
| | - Oliver J Robinson
- Institute of Cognitive Neuroscience, University College London, WC1N 3AZ, London, United Kingdom
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Nasehi M, Hasanvand S, Khakpai F, Zarrindast MR. The effect of CA1 dopaminergic system on amnesia induced by harmane in mice. Acta Neurol Belg 2019; 119:369-377. [PMID: 29767374 DOI: 10.1007/s13760-018-0926-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 04/16/2018] [Indexed: 12/28/2022]
Abstract
In the present study, the effects of bilateral injections of dopaminergic drugs into the hippocampal CA1 regions (intra-CA1) on harmane-induced amnesia were examined in mice. We used a single-trial step-down inhibitory avoidance task for the assessment of memory acquisition in adult male mice. Our data indicated that pre-training intra-peritoneal (i.p.) administration of harmane (12 mg/kg) impaired memory acquisition. Moreover, intra-CA1 administration of dopamine D1 receptor agonist, SKF38393 (0.25 µg/mouse), dopamine D1 receptor antagonist, SCH23390 (0.25 µg/mouse), dopamine D2 receptor agonist, quinpirole (0.125 and 0.25 µg/mouse) and dopamine D2 receptor antagonist, sulpiride (0.2 and 0.4 µg/mouse) decreased the learning of a single-trial inhibitory avoidance task. Furthermore, pre-training intra-CA1 injection of sub-threshold doses of SKF38393 (0.0625 µg/mouse) or sulpiride (0.1 µg/mouse) increased pre-training harmane (4 and 8 mg/kg, i.p.)-induced amnesia. On the other hand, pre-training intra-CA1 injection of a sub-threshold dose of SCH23390 (0.0625 µg/mouse) reversed amnesia induced by an effective dose of harmane (12 mg/kg; i.p.). In addition, Pre-training intra-CA1 injection of quinpirole (0.0625 µg/mouse) had no effect on memory impairment induced by harmane. These findings indicate the involvement of CA1 dopaminergic system on harmane-induced impairment of memory acquisition.
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Bashiri H, Hosseini-Chegeni H, Alsadat Sharifi K, Sahebgharani M, Salari AA. Activation of TRPV1 receptors affects memory function and hippocampal TRPV1 and CREB mRNA expression in a rat model of biliary cirrhosis. Neurol Res 2018; 40:938-947. [PMID: 30079821 DOI: 10.1080/01616412.2018.1504158] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Memory impairment induced by biliary cirrhosis is associated with abnormalities in the function of different neurotransmitter systems. However, the exact molecular mechanisms involved in the learning and memory dysfunctions following biliary cirrhosis is largely unknown. This study set out to determine whether activation of transient receptor potential vanilloid type 1 (TRPV1) in the CA1 area of the hippocampus in rats improve memory impairment induced by biliary cirrhosis. METHODS To assess learning and memory, passive avoidance task was carried out using a shuttle box. The mRNA expression of TRPV1 and cAMP response element binding (CREB) protein in the hippocampus were also evaluated by qT-PCR. RESULTS Our results indicated that activation of TRPV1 channels by capsaicin significantly decreased memory impairment and increased mRNA expression of the TRPV1 and CREB in the hippocampus of rats with biliary cirrhosis. Our findings also demonstrated that a positive correlation existed between mRNA expression of TRPV1 and CREB, and between memory function and TRPV1 expression. DISCUSSION Taken together, the results of this study support the view that TRPV1 receptor may play an important role in the regulation of learning and memory functions, and suggest that activation of TRPV1 channels seems to be a promising therapeutic target for learning and memory impairments following biliary cirrhosis.
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Affiliation(s)
- Hamideh Bashiri
- a Neuroscience Research Center, Institute of Neuropharmacology , Department of Physiology and Pharmacology, Afzalipour School of Medical, Kerman University of Medical Sciences , Kerman , Iran
| | | | - Khadijeh Alsadat Sharifi
- c Department of Neuroscience , School of Advanced Technologies in Medicine, Tehran University of Medical Sciences , Tehran , Iran
| | - Mousa Sahebgharani
- d Department of Pharmacology , School of Medicine, Tehran University of Medical Sciences , Tehran , Iran
| | - Ali-Akbar Salari
- e Drug Applied Research Center, Tabriz University of Medical Sciences , Tabriz , Iran
- f Salari Institute of Cognitive and Behavioral Disorders (SICBD) , Alborz , Iran
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8
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Michalak A, Pekala K, Budzynska B, Kruk-Slomka M, Biala G. The role of verapamil and SL-327 in morphine- and ethanol-induced state-dependent and cross state-dependent memory. Eur J Pharmacol 2018; 834:318-326. [DOI: 10.1016/j.ejphar.2018.07.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 07/20/2018] [Accepted: 07/26/2018] [Indexed: 11/24/2022]
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9
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Nasehi M, Mafi F, Ebrahimi-Ghiri M, Zarrindast MR. Function of opioidergic and dopaminergic antagonists on both spatial and object novelty detection deficits induced in rodent model of hepatic encephalopathy. Behav Brain Res 2016; 313:58-66. [DOI: 10.1016/j.bbr.2016.07.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 07/05/2016] [Accepted: 07/07/2016] [Indexed: 01/27/2023]
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10
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Nasehi M, Meskarian M, Khakpai F, Zarrindast MR. Harmaline-induced amnesia: Possible role of the amygdala dopaminergic system. Neuroscience 2015; 312:1-9. [PMID: 26556066 DOI: 10.1016/j.neuroscience.2015.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 11/03/2015] [Accepted: 11/03/2015] [Indexed: 11/16/2022]
Abstract
In this study, we examined the effect of bilateral intra-basolateral amygdala (intra-BLA) microinjections of dopamine receptor agents on amnesia induced by a β-carboline alkaloid, harmaline in mice. We used a step-down method to assess memory and then, hole-board method to assess exploratory behaviors. The results showed that pre-training intra-BLA injections of dopamine D1 receptor antagonist and agonist (SCH23390 (0.5μg/mouse) and SKF38393 (0.5μg/mouse), respectively) impaired memory acquisition. In contrast, pre-training intra-BLA injections of dopamine D2 receptor antagonist and agonist (sulpiride and quinpirole, respectively) have no significant effect on memory acquisition. Pre-training intra-peritoneal (i.p.) injection of harmaline (1mg/kg) decreased memory acquisition. However, co-administration of SCH 23390 (0.01μg/mouse) with different doses of harmaline did not alter amnesia. Conversely, pre-training intra-BLA injection of SKF38393 (0.1μg/mouse), sulpiride (0.25μg/mouse) or quinpirole (0.1μg/mouse) reversed harmaline (1mg/kg, i.p.)-induced amnesia. Furthermore, all above doses of drugs had no effect on locomotor activity. In conclusion, the dopamine D1 and D2 receptors of the BLA may be involved in the impairment of memory acquisition induced by harmaline.
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Affiliation(s)
- M Nasehi
- Cognitive and Neruroscience Research Center, CNRC, Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran.
| | - M Meskarian
- Department of Biology, Faculty of Basic Sciences, Northern Branch, Islamic Azad University, Tehran, Iran
| | - F Khakpai
- Institute for Cognitive Science Studies (ICSS), Tehran, Iran
| | - M-R Zarrindast
- Cognitive and Neruroscience Research Center, CNRC, Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran; Institute for Cognitive Science Studies (ICSS), Tehran, Iran; Department of Pharmacology and Iranian National Center for Addiction Studies, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran.
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Hunt PS, Barnet RC. Adolescent and adult rats differ in the amnesic effects of acute ethanol in two hippocampus-dependent tasks: Trace and contextual fear conditioning. Behav Brain Res 2015; 298:78-87. [PMID: 26192910 DOI: 10.1016/j.bbr.2015.06.046] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Revised: 06/22/2015] [Accepted: 06/23/2015] [Indexed: 12/11/2022]
Abstract
Experience-produced deficits in trace conditioning and context conditioning have been useful tools for examining the role of the hippocampus in learning. It has also been suggested that learning in these tasks is especially vulnerable to neurotoxic effects of alcohol during key developmental periods such as adolescence. In five experiments we systematically examined the presence and source of age-dependent vulnerability to the memory-disrupting effects of acute ethanol in trace conditioning and contextual fear conditioning. In Experiment 1a pre-training ethanol disrupted trace conditioning more strongly in adolescent (postnatal day, PD30-35) than adult rats (PD65-75). In Experiment 1b when pre-training ethanol was accompanied by pre-test ethanol no deficit in trace conditioning was observed in adolescents, suggesting that state-dependent retrieval failure mediated ethanol's disruption of trace conditioning at this age. Experiment 2a and b examined the effect of ethanol pretreatment on context conditioning. Here, adult but not adolescent rats were impaired in conditioned freezing to context cues. Experiment 2c explored state-dependency of this effect. Pre-training ethanol continued to disrupt context conditioning in adults even when ethanol was also administered prior to test. Collectively these findings reveal clear age-dependent and task-dependent vulnerabilities in ethanol's disruptive effects on hippocampus-dependent memory. Adolescents were more disrupted by ethanol in trace conditioning than adults, and adults were more disrupted by ethanol in context conditioning than adolescents. We suggest that adolescents may be more susceptible to changes in internal state (state-dependent retrieval failure) than adults and that ethanol disrupted performance in trace and context conditioning through different mechanisms. Relevance of these findings to theories of hippocampus function is discussed.
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Affiliation(s)
- Pamela S Hunt
- Department of Psychology, College of William & Mary, United States.
| | - Robert C Barnet
- Department of Psychology, College of William & Mary, United States
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12
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Alterations in the hippocampal phosphorylated CREB expression in drug state-dependent learning. Behav Brain Res 2015; 292:109-15. [PMID: 26055203 DOI: 10.1016/j.bbr.2015.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 06/01/2015] [Accepted: 06/03/2015] [Indexed: 01/08/2023]
Abstract
The present study investigated the possible alterations of hippocampal CREB phosphorylation in drug state-dependent memory retrieval. One-trial step-down passive avoidance task was used to assess memory retrieval in adult male NMRI mice. Pre-training administration of ethanol (1g/kg, i.p.) induced amnesia. Pre-test administration of ethanol (1g/kg, i.p) or nicotine (0.7 mg/kg, s.c.) reversed ethanol-induced amnesia, indicating ethanol- or ethanol-nicotine induced state-dependent learning (STD). Using Western blot analysis, it was found that the p-CREB/CREB ratio in the hippocampus increased in the mice that showed successful memory retrieval as compared with untrained mice. In contrast, pre-training administration of ethanol (1g/kg, i.p.) decreased the hippocampal p-CREB/CREB ratio in comparison with the control group. The hippocampal p-CREB/CREB ratio enhanced in ethanol- and ethanol-nicotine induced STD. Moreover, memory impairment induced by pre-training administration of WIN (1 mg/kg, i.p.) improved in the animals that received pre-test administration of WIN (1 mg/kg, i.p.), ethanol (0.5 g/kg, i.p.) or nicotine (0.7 mg/kg, s.c.), suggesting a cross STD between the drugs. The p-CREB/CREB ratio in the hippocampus decreased in the of WIN-induced amnesia and STD groups in comparison with the control group. In addition, cross state-dependent learning between WIN and ethanol or nicotine was associated with the increase of the hippocampal p-CREB/CREB ratio. It can be concluded that phosphorylation of CREB in the hippocampus is a critical event underlying the interaction of co-administration of drugs on memory retrieval in passive avoidance learning.
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The effect of CA1 dopaminergic system in harmaline-induced amnesia. Neuroscience 2015; 285:47-59. [DOI: 10.1016/j.neuroscience.2014.11.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 10/31/2014] [Accepted: 11/04/2014] [Indexed: 11/19/2022]
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Zarrindast MR, Ownegh V, Rezayof A, Ownegh F. The involvement of dorsal hippocampus in dextromethorphan-induced state-dependent learning in mice. Pharmacol Biochem Behav 2014; 116:90-5. [DOI: 10.1016/j.pbb.2013.11.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 11/10/2013] [Accepted: 11/14/2013] [Indexed: 10/26/2022]
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Blockade of the dorsal hippocampal dopamine D1 receptors inhibits the scopolamine-induced state-dependent learning in rats. Neuroscience 2013; 252:460-7. [PMID: 23933216 DOI: 10.1016/j.neuroscience.2013.08.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Revised: 07/27/2013] [Accepted: 08/01/2013] [Indexed: 02/06/2023]
Abstract
In the present study, we investigated the possible role of the dorsal hippocampal (CA1) dopamine D1 receptors on scopolamine-induced amnesia as well as scopolamine state-dependent memory in adult male Wistar rats. Animals were bilaterally implanted with chronic cannulae in the CA1 regions of the dorsal hippocampus, trained in a step-through type inhibitory avoidance task, and tested 24h after training for their step-through latency. Results indicated that pre-training or pre-test intra-CA1 administration of scopolamine (1.5 and 3 μg/rat) dose-dependently reduced the step-through latency, showing an amnestic response. The pre-training scopolamine-induced amnesia (3 μg/rat) was reversed by the pre-test administration of scopolamine, indicating a state-dependent effect. Similarly, the pre-test administration of dopamine D1 receptor agonist, 1-phenyl-7,8-dihydroxy-2,3,4,5-tetrahydro-1H-3-benzazepine hydrochloride (SKF38393; 1, 2 and 4 μg/rat, intra-CA1), could significantly reverse the scopolamine-induced amnesia. Interestingly, administration of an ineffective dose of scopolamine (0.25 μg/rat, intra-CA1) before different doses of SKF38393, blocked the reversal effect of SKF38393 on the pre-training scopolamine-induced amnesia. Moreover, while the pre-test intra-CA1 injection of the dopamine D1 receptor antagonist, R(+)-7-chloro-8-hydroxy-3-methyl-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine hydrochloride (SCH23390; 0.1 and 0.5 μg/rat, intra-CA1), resulted in apparent memory impairment, microinjection of the same doses of this agent inhibited the scopolamine-induced state-dependent memory. These results indicate that the CA1 dopamine D1 receptors may potentially play an important role in scopolamine-induced amnesia as well as the scopolamine state-dependent memory. Furthermore, our results propose that dopamine D1 receptor agonist, SKF38393 reverses the scopolamine-induced amnesia via acetylcholine release and possibly through the activation of muscarinic receptors.
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Nasehi M, Ahmadzadeh O, Rezayof A, Zarrindast MR. Does CA1 dopaminergic system play a role in cholestasis induced hypothermia? PATHOPHYSIOLOGY 2013; 20:181-9. [DOI: 10.1016/j.pathophys.2013.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 08/05/2013] [Accepted: 08/08/2013] [Indexed: 01/08/2023] Open
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López-Cruz L, Salamone JD, Correa M. The Impact of Caffeine on the Behavioral Effects of Ethanol Related to Abuse and Addiction: A Review of Animal Studies. JOURNAL OF CAFFEINE RESEARCH 2013; 3:9-21. [PMID: 24761272 PMCID: PMC3643311 DOI: 10.1089/jcr.2013.0003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The impact of caffeine on the behavioral effects of ethanol, including ethanol consumption and abuse, has become a topic of great interest due to the rise in popularity of the so-called energy drinks. Energy drinks high in caffeine are frequently taken in combination with ethanol under the popular belief that caffeine can offset some of the intoxicating effects of ethanol. However, scientific research has not universally supported the idea that caffeine can reduce the effects of ethanol in humans or in rodents, and the mechanisms mediating the caffeine-ethanol interactions are not well understood. Caffeine and ethanol have a common biological substrate; both act on neurochemical processes related to the neuromodulator adenosine. Caffeine acts as a nonselective adenosine A1 and A2A receptor antagonist, while ethanol has been demonstrated to increase the basal adenosinergic tone via multiple mechanisms. Since adenosine transmission modulates multiple behavioral processes, the interaction of both drugs can regulate a wide range of effects related to alcohol consumption and the development of ethanol addiction. In the present review, we discuss the relatively small number of animal studies that have assessed the interactions between caffeine and ethanol, as well as the interactions between ethanol and subtype-selective adenosine receptor antagonists, to understand the basic findings and determine the possible mechanisms of action underlying the caffeine-ethanol interactions.
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Affiliation(s)
| | - John D. Salamone
- Department of Psychology, University of Connecticut, Storrs, Connecticut
| | - Mercè Correa
- Àrea de Psicobiologia, Universitat Jaume I, Castelló, Spain
- Department of Psychology, University of Connecticut, Storrs, Connecticut
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Zarrindast MR, Mashayekhi M, Rezayof A, Ahmadi S. β-Adrenoceptors in the dorsal hippocampus are involved in ethanol-induced state-dependent retrieval in mice. Neurobiol Learn Mem 2013; 100:12-7. [DOI: 10.1016/j.nlm.2012.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 11/28/2012] [Accepted: 11/28/2012] [Indexed: 11/27/2022]
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19
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Raoufi N, Piri M, Moshfegh A, Shahin MS. Nicotine improves ethanol-induced impairment of memory: Possible involvement of nitric oxide in the dorsal hippocampus of mice. Neuroscience 2012; 219:82-91. [DOI: 10.1016/j.neuroscience.2012.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 06/02/2012] [Accepted: 06/04/2012] [Indexed: 02/03/2023]
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20
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Sanday L, Patti CL, Zanin KA, Fernandes-Santos L, Oliveira LC, Kameda SR, Tufik S, Frussa-Filho R. Ethanol-Induced Memory Impairment in a Discriminative Avoidance Task is State-Dependent. Alcohol Clin Exp Res 2012; 37 Suppl 1:E30-9. [DOI: 10.1111/j.1530-0277.2012.01905.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Accepted: 06/06/2012] [Indexed: 11/27/2022]
Affiliation(s)
- Leandro Sanday
- Departamento de Farmacologia; Universidade Federal de São Paulo; São Paulo; SP; Brasil
| | | | | | | | - Larissa C. Oliveira
- Departamento de Farmacologia; Universidade Federal de São Paulo; São Paulo; SP; Brasil
| | | | - Sergio Tufik
- Departamento de Psicobiologia; Universidade Federal de São Paulo; São Paulo; SP; Brasil
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Nazari-Serenjeh F, Rezayof A, Zarrindast MR. Functional correlation between GABAergic and dopaminergic systems of dorsal hippocampus and ventral tegmental area in passive avoidance learning in rats. Neuroscience 2011; 196:104-14. [PMID: 21925239 DOI: 10.1016/j.neuroscience.2011.08.073] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2011] [Revised: 08/27/2011] [Accepted: 08/29/2011] [Indexed: 01/09/2023]
Abstract
The aim of the present study was to investigate the existence of possible functional correlation between GABA-A and dopamine (DA) receptors of the dorsal hippocampus and the ventral tegmental area (VTA) in passive avoidance learning. Two guide cannulas were stereotaxically implanted in the CA1 region of the dorsal hippocampus and the VTA of male Wistar rats. In order to measure memory retrieval, the animals were trained in a step-through type passive avoidance task and tested 24 h after training. Post-training intra-CA1 administration of a GABA-A receptor agonist, muscimol (0.01-0.02 μg/rat) dose-dependently impaired memory retrieval. Post-training intra-VTA administration of SCH23390 (a dopamine D1 receptor antagonist; 0.1-0.8 μg/rat) or sulpiride (a D2 receptor antagonist; 0.5-1.5 μg/rat) decreased the inhibitory effect of muscimol (0.02 μg/rat, intra-CA1) on memory retrieval. Intra-VTA administration of the same doses of SCH23390, but not sulpiride, decreased the step-through latencies. On the other hand, post-training administration of muscimol (0.02 μg/rat) into the VTA inhibited memory retrieval. The administration of SCH23390 (0.01-0.2 μg/rat) or sulpiride (0.1-1 μg/rat) into the CA1 region, immediately after training, had no effect on memory retrieval. Furthermore, the amnesic effect of intra-VTA administration of muscimol was significantly decreased by intra-CA1 administration of sulpiride (0.5 and 1 μg/rat, intra-CA1), but not SCH23390. The practical conclusion is that the relationship between the hippocampus and the VTA may regulate memory formation in passive avoidance learning. Also, the correlation between the hippocampus and VTA by a dopaminergic system may be involved in mediating muscimol-induced amnesia.
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Affiliation(s)
- F Nazari-Serenjeh
- Department of Animal Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
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23
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Rezayof A, Zare-Chahoki A, Zarrindast MR, Rassouli Y. Inhibition of dorsal hippocampal nitric oxide synthesis potentiates ethanol-induced state-dependent memory in mice. Behav Brain Res 2010; 209:189-95. [DOI: 10.1016/j.bbr.2010.01.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2009] [Revised: 01/15/2010] [Accepted: 01/20/2010] [Indexed: 11/30/2022]
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Zarrindast MR, Dorrani M, Lachinani R, Rezayof A. Blockade of dorsal hippocampal dopamine receptors inhibits state-dependent learning induced by cannabinoid receptor agonist in mice. Neurosci Res 2010; 67:25-32. [DOI: 10.1016/j.neures.2010.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 01/28/2010] [Accepted: 02/01/2010] [Indexed: 10/19/2022]
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Involvement of dopamine D1/D2 receptors on harmane-induced amnesia in the step-down passive avoidance test. Eur J Pharmacol 2010; 634:77-83. [PMID: 20188725 DOI: 10.1016/j.ejphar.2010.02.027] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Revised: 01/19/2010] [Accepted: 02/08/2010] [Indexed: 11/22/2022]
Abstract
Ingestion of harmane and other alkaloids derived from plant Peganum harmala has been shown to elicit profound behavioural and toxic effects in humans, including hallucinations, excitation, feelings of elation, and euphoria. These alkaloids in the high doses can cause a toxic syndrome characterized by tremors and convulsions. Harmane has also been shown to act on a variety of receptor systems in the mammalian brain, including those for serotonin, dopamine and benzodiazepines. In animals, it has been reported to affect short and long term memory. In the present study, effects of dopamine D1 and D2 receptor antagonists on the harmane (HA)-induced amnesia and exploratory behaviors were examined in mice. One-trial step-down and hole-board paradigms were used for the assessment of memory retention and exploratory behaviors in adult male NMRI mice respectively. Intraperitoneal (i.p.) administration of HA (5 and 10 mg/kg) immediately after training decreased memory consolidation, while had no effect on anxiety-like behavior. Memory retrieval was not altered by 15- or 30 min pre-testing administration of the D1 (SCH23390, 0.025, 0.05 and 0.1 mg/kg) or D2 (sulpiride 12.5, 25 and 50 mg/kg) receptor antagonists, respectively. In contrast, SCH23390 (0.05 and 0.1 mg/kg) or sulpiride (25 and 50 mg/kg) pre-test administration fully reversed HA-induced impairment of memory consolidation. Finally, neither D1 nor D2 receptor blockade affected exploratory behaviors in the hole-board paradigm. Altogether, these findings strongly suggest an involvement of D1 and D2 receptors modulation in the HA-induced impairment of memory consolidation.
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Rezayof A, Shirazi-Zand Z, Zarrindast MR, Nayer-Nouri T. Nicotine improves ethanol-induced memory impairment: The role of dorsal hippocampal NMDA receptors. Life Sci 2010; 86:260-6. [DOI: 10.1016/j.lfs.2009.12.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 10/29/2009] [Accepted: 12/17/2009] [Indexed: 11/25/2022]
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27
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Intradorsal hippocampal microinjection of lithium reverses morphine-induced impairment of memory in mice: interactions with dopamine receptor mechanism(s). Behav Pharmacol 2009; 20:680-7. [DOI: 10.1097/fbp.0b013e3283323c75] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Ricoy UM, Martinez JL. Local hippocampal methamphetamine-induced reinforcement. Front Behav Neurosci 2009; 3:47. [PMID: 19949457 PMCID: PMC2783399 DOI: 10.3389/neuro.08.047.2009] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Accepted: 10/29/2009] [Indexed: 11/13/2022] Open
Abstract
Drug abuse and addiction are major problems in the United States. In particular methamphetamine (METH) use has increased dramatically. A greater understanding of how METH acts on the brain to induce addiction may lead to better therapeutic targets for this problem. The hippocampus is recognized as an important structure in learning and memory, but is not typically associated with drug reinforcement or reward processes. Here, the focus is on the hippocampus which has been largely ignored in the addiction literature as compared to the nucleus accumbens (NAc), ventral tegmental area (VTA), and prefrontal cortex (PFC). The results show that METH administered unilaterally via a microdialysis probe to rats’ right dorsal hippocampus will induce drug-seeking (place preference) and drug-taking (lever-pressing) behavior. Furthermore, both of these responses are dependent on local dopamine (DA) receptor activation, as they are impaired by a selective D1/D5 receptor antagonist. The results suggest that the hippocampus is part of the brain's reward circuit that underlies addiction.
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Affiliation(s)
- Ulises M Ricoy
- Department of Biology, University of Texas at San Antonio San Antonio, TX, USA.
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29
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Rezayof A, Sharifi K, Zarrindast MR, Rassouli Y. Modulation of ethanol state-dependent learning by dorsal hippocampal NMDA receptors in mice. Alcohol 2008; 42:667-74. [PMID: 18774674 DOI: 10.1016/j.alcohol.2008.05.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Revised: 05/09/2008] [Accepted: 05/23/2008] [Indexed: 01/31/2023]
Abstract
The possible role of N-methyl-D-aspartate (NMDA) receptors of dorsal hippocampus on ethanol state-dependent learning was studied in adult male mice (Pasteur Institute, Iran). As a model of memory, a single-trial step-down passive avoidance task was used. All animals were bilaterally implanted with cannulae into the CA1 regions of dorsal hippocampi. Results show that intraperitoneal (i.p.) administration of ethanol (0.5 and 1 g/kg) 30 min before training impaired memory performance in animals when tested 24h later. Pretest administration of the same doses of ethanol-induced state-dependent retrieval of the memory acquired under pretraining ethanol (1 g/kg, i.p.) influence. Pretest intra-CA1 microinjection of NMDA (0.001, 0.01, and 0.1 microg/mouse) by itself had no effect on memory retrieval and ethanol-induced amnesia. However, pretest intra-CA1 administration of the same doses of NMDA with an ineffective dose of ethanol (0.25 g/kg, i.p.) significantly restored the retrieval and potentiated ethanol state-dependent learning. On the other hand, pretest administration of a competitive NMDA receptor antagonist D-AP5 (D-(-)-2-Amino-5-phosphonopentanoic acid) (0.01, 0.1, and 1 microg/mouse, intra-CA1) or a noncompetitive NMDA receptor antagonist MK-801 maleate [(5S, 10R)-(+)-5-Methyl-10, 11-dihydro-5H-dibenzo [a, d] cyclohepten-5, 10-imine maleate] (0.25, 0.5, and 1 g/mouse, intra-CA1) 5 min before the administration of ethanol (1 g/kg, i.p.) significantly inhibited ethanol state-dependent learning. Intra-CA1 pretest administration of D-AP5 (0.01, 0.1, and 1 microg/mouse) or MK-801 maleate [5S, 10R)-(+)-5-Methyl-10, 11-dihydro-5H-dibenzo [a, d] cyclohepten-5, 10-imine maleate] (0.25, 0.5, and 1 microg/mouse) alone did not affect memory retention. It may be concluded that dorsal hippocampal NMDA receptors are involved in mediating ethanol state-dependent learning.
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Affiliation(s)
- Ameneh Rezayof
- Department of Animal Biology, School of Biology, College of Science, University of Tehran, P. O. Box 4155-6455, Tehran, Iran.
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Rezayof A, Alijanpour S, Zarrindast MR, Rassouli Y. Ethanol state-dependent memory: Involvement of dorsal hippocampal muscarinic and nicotinic receptors. Neurobiol Learn Mem 2008; 89:441-7. [DOI: 10.1016/j.nlm.2007.10.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2007] [Revised: 10/14/2007] [Accepted: 10/31/2007] [Indexed: 11/17/2022]
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31
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Khajehpour L, Rezayof A, Zarrindast MR. Involvement of dorsal hippocampal nicotinic receptors in the effect of morphine on memory retrieval in passive avoidance task. Eur J Pharmacol 2008; 584:343-51. [PMID: 18316071 DOI: 10.1016/j.ejphar.2008.02.030] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2007] [Revised: 01/30/2008] [Accepted: 02/13/2008] [Indexed: 11/29/2022]
Abstract
The present study evaluated the possible role of nicotinic acetylcholine receptors of the dorsal hippocampus on morphine-induced amnesia and morphine state-dependent memory in adult male Wistar rats. The animals were bilaterally implanted with chronic cannulas in the CA1 regions of the dorsal hippocampi, trained in a step-through type passive avoidance task, and tested 24 h after training to measure step-through latency. Results indicate that post-training subcutaneous (s.c.) administration of morphine (2.5-7.5 mg/kg) dose-dependently reduced the step-through latency, showing an amnestic response. Post-training intra-CA1 microinjection of nicotine (0.5-1 microg/rat) decreased significantly the amnesia induced by post-training morphine (7.5 mg/kg). Moreover, co-treatment of mecamylamine (0.5 and 1 microg/rat, intra-CA1) with an ineffective dose of morphine (2.5 mg/kg), immediately after training, caused inhibition of memory retrieval. On the other hand, amnesia produced by post-training morphine (7.5 mg/kg) was reversed by pre-test administration of the opioid that is due to a state-dependent effect. Interestingly, pre-test intra-CA1 microinjection of nicotine (0.25 and 0.5 microg/rat) improved post-training morphine (7.5 mg/kg)-induced retrieval impairment. Moreover, pre-test administration of the same doses of nicotine in combination with a lower dose of morphine (0.5 mg/kg), which had no effects alone, synergistically improved memory performance impaired by post-training morphine. Pre-test injection of mecamylamine (0.5-2 microg/rat) prevented the restoration of memory by pre-test morphine. It is important to note that post-training or pre-test intra-CA1 administration of the same doses of nicotine or mecamylamine, alone did not affect memory retrieval. These results suggest that nicotinic acetylcholine receptors of the hippocampal CA1 regions may play an important role in morphine-induced amnesia and morphine state-dependent memory.
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Affiliation(s)
- Lotfollah Khajehpour
- Department of Animal Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
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Yin HH, Park BS, Adermark L, Lovinger DM. Ethanol reverses the direction of long-term synaptic plasticity in the dorsomedial striatum. Eur J Neurosci 2007; 25:3226-32. [PMID: 17552991 DOI: 10.1111/j.1460-9568.2007.05606.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The striatum is a critical structure for the control of voluntary behaviour, and striatal synaptic plasticity has been implicated in instrumental learning. As ethanol consumption can cause impairments in cognition, learning, and action selection, it is important to understand the effects of this drug on striatal function. In this study we examined the effects of ethanol on long-term synaptic plasticity in the dorsomedial striatum (DMS), a striatal subregion that plays a central role in the acquisition and selection of goal-directed actions. Ethanol was found to impair N-methyl-d-aspartic acid receptor (NMDAR)-dependent long-term potentiation (LTP) dose-dependently in the DMS, and to promote long-term depression (LTD) at the highest concentration (50 mm) used. These results suggest that ethanol, at a concentration usually associated with mild intoxication, could significantly change experience-dependent modification of corticostriatal circuits underlying the learning of goal-directed instrumental actions.
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Affiliation(s)
- Henry H Yin
- Section on Synaptic Pharmacology, Laboratory for Integrative Neuroscience, NIAAA/NIH, 5625 Fishers Lane, TS-13, Bethesda, Maryland 20892, USA
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