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Nikitin V, Solntseva S, Kozyrev S, Nikitin P. Long-term memory consolidation or reconsolidation impairment induces amnesia with key characteristics that are similar to key learning characteristics. Neurosci Biobehav Rev 2020; 108:542-558. [DOI: 10.1016/j.neubiorev.2019.12.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 09/16/2019] [Accepted: 12/03/2019] [Indexed: 02/07/2023]
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Nikitin VP, Solntseva SV, Kozyrev SA, Nikitin PV. Proteins or RNA synthesis inhibitors suppressed induction of amnesia developing under impairment of memory reconsolidation by serotonin receptors antagonist. Neurochem Int 2019; 131:104520. [PMID: 31400436 DOI: 10.1016/j.neuint.2019.104520] [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: 05/09/2019] [Revised: 08/03/2019] [Accepted: 08/07/2019] [Indexed: 10/26/2022]
Abstract
Studies have shown that retrieval of long-term memory can cause memory reconsolidation, and impaired reconsolidation leads to amnesia development. However, the mechanisms of amnesia induction due to impaired memory reconsolidation remains poorly described. Using experiments involving grape snails trained to conditioned food aversion, we studied the role of translation and transcription processes and the role of serotonin receptors in the mechanisms of amnesia induction. We found that administration of a serotonin receptor antagonist or a protein synthesis inhibitor before the administration of a reminder using a conditioned food stimulus induced amnesia development, whereas injections of mRNA synthesis inhibitor did not affect memory safety. Moreover, combined injections of an antagonist of serotonin receptor and inhibitors of protein or mRNA synthesis before reminder administration completely prevented amnesia development. In addition, inhibitors of protein or mRNA synthesis prevented amnesia development 3 h but not 9 h after the administration of a serotonin receptor antagonist/reminder. We hypothesize that the mechanisms of amnesia induction caused by impaired memory reconsolidation depend on protein and mRNA syntheses within a certain time window, similar to the mechanisms of induction of other long-term plastic brain rearrangements.
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Affiliation(s)
- Vladimir P Nikitin
- P.K. Anokhin Research Institute of Normal Physiology, Laboratory of Functional Neurochemistry, Baltiyskala Str. 8, 125315, Moscow, Russian Federation.
| | - Svetlana V Solntseva
- P.K. Anokhin Research Institute of Normal Physiology, Laboratory of Functional Neurochemistry, Baltiyskala Str. 8, 125315, Moscow, Russian Federation
| | - Sergey A Kozyrev
- P.K. Anokhin Research Institute of Normal Physiology, Laboratory of Functional Neurochemistry, Baltiyskala Str. 8, 125315, Moscow, Russian Federation
| | - Pavel V Nikitin
- P.K. Anokhin Research Institute of Normal Physiology, Laboratory of Functional Neurochemistry, Baltiyskala Str. 8, 125315, Moscow, Russian Federation; N.N. Burdenko National Medical Research Center of Neurosurgery, Department of Neuropathology and Molecular Diagnostics, Moscow, Russian Federation
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Administration of Protein Synthesis Inhibitor before Reminder Reverses Amnesia Induced by Memory Reconsolidation Impairment with 5-HT Receptors Antagonist. Bull Exp Biol Med 2019; 167:1-6. [PMID: 31177445 DOI: 10.1007/s10517-019-04448-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Indexed: 10/26/2022]
Abstract
Administration of 5-HT receptor antagonist to snails trained in conditioned food aversion prior to reminding of the conditioning stimulus caused amnesia. At the early period of amnesia (day 3), injections of protein synthesis inhibitor cycloheximide without reminder or reminder alone were ineffective. At the same time, injections of the inhibitor combined with reminder led to memory recovery; this effect in most animals persisted for at least 10 days. In the rest snails, aversive responses to presentations of the conditioning stimulus persisted for 2 days. Cycloheximide injection and reminder in 10 days after induction of amnesia did not affect its development or caused a transient memory recovery (2 days). We hypothesized that amnesia is an active process unfolding in time. One of mechanism of this process is reminder-induced and protein synthesis-depended reactivation of amnesia. Inhibitor of protein synthesis disturbed this reactivation and led to recovery of the initial memory of conditioned food aversion.
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Totani Y, Aonuma H, Oike A, Watanabe T, Hatakeyama D, Sakakibara M, Lukowiak K, Ito E. Monoamines, Insulin and the Roles They Play in Associative Learning in Pond Snails. Front Behav Neurosci 2019; 13:65. [PMID: 31001093 PMCID: PMC6454038 DOI: 10.3389/fnbeh.2019.00065] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 03/14/2019] [Indexed: 12/28/2022] Open
Abstract
Molluscan gastropods have long been used for studying the cellular and molecular mechanisms underlying learning and memory. One such gastropod, the pond snail Lymnaea stagnalis, exhibits long-term memory (LTM) following both classical and operant conditioning. Using Lymnaea, we have successfully elucidated cellular mechanisms of learning and memory utilizing an aversive classical conditioning procedure, conditioned taste aversion (CTA). Here, we present the behavioral changes following CTA training and show that the memory score depends on the duration of food deprivation. Then, we describe the relationship between the memory scores and the monoamine contents of the central nervous system (CNS). A comparison of learning capability in two different strains of Lymnaea, as well as the filial 1 (F1) cross from the two strains, presents how the memory scores are correlated in these populations with monoamine contents. Overall, when the memory scores are better, the monoamine contents of the CNS are lower. We also found that as the insulin content of the CNS decreases so does the monoamine contents which are correlated with higher memory scores. The present review deepens the relationship between monoamine and insulin contents with the memory score.
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Affiliation(s)
- Yuki Totani
- Department of Biology, Waseda University, Tokyo, Japan
| | - Hitoshi Aonuma
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Japan
| | - Akira Oike
- Department of Biology, Waseda University, Tokyo, Japan
| | - Takayuki Watanabe
- Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo, Japan
| | - Dai Hatakeyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, Japan
| | - Manabu Sakakibara
- Research Organization for Nano and Life Innovation, Waseda University, Tokyo, Japan
| | - Ken Lukowiak
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Etsuro Ito
- Department of Biology, Waseda University, Tokyo, Japan
- Research Organization for Nano and Life Innovation, Waseda University, Tokyo, Japan
- Graduate Institute of Medicine, School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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Deryabina IB, Muranova LN, Andrianov VV, Gainutdinov KL. Impairing of Serotonin Synthesis by P-Chlorphenylanine Prevents the Forgetting of Contextual Memory After Reminder and the Protein Synthesis Inhibition. Front Pharmacol 2018; 9:607. [PMID: 29946257 PMCID: PMC6005873 DOI: 10.3389/fphar.2018.00607] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 05/21/2018] [Indexed: 12/16/2022] Open
Abstract
HIGHLIGHTSThe injection of p-chlorophenylalanine, specific blocker of 5-HT synthesis 3 days before reminder with anisomycin administration prevented forgetting.
It is known that the reminder cause reactivation of the long-term memory and it leads to reconsolidation of memory. We showed earlier that the disruption of the reconsolidation of contextual memory in terrestrial snail was caused by anisomycin, the inhibitor of protein syntheses (Gainutdinova et al., 2005; Balaban et al., 2014). In this paper we investigated the possible changes of the memory reconsolidation under the conditions of serotonin deficit, caused by administration of p-chlorophenylalanine, the inhibitor of tryptophan hydroxylase synthesis (intermediate stage of the synthesis of serotonin). It was shown that the forgetting process for contextual memory after reminder and inhibition of protein synthesis did not occur if the serotonin transmission in nervous system was impaired. This effect was significantly different from the direct action of anisomycin, which blocked the reconsolidation of contextual memory. We concluded that the serotonin system was included to the process of memory reconsolidation.
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Affiliation(s)
- Irina B Deryabina
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Lyudmila N Muranova
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Vyatcheslav V Andrianov
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Khalil L Gainutdinov
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
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Nikitin VP, Solntseva SV, Kozyrev SA, Nikitin PV, Shevelkin AV. NMDA or 5-HT receptor antagonists impair memory reconsolidation and induce various types of amnesia. Behav Brain Res 2018; 345:72-82. [PMID: 29499285 DOI: 10.1016/j.bbr.2018.02.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Revised: 02/10/2018] [Accepted: 02/26/2018] [Indexed: 12/12/2022]
Abstract
Elucidation of amnesia mechanisms is one of the central problems in neuroscience with immense practical application. Previously, we found that conditioned food presentation combined with injection of a neurotransmitter receptor antagonist or protein synthesis inhibitor led to amnesia induction. In the present study, we investigated the time course and features of two amnesias: induced by impairment of memory reconsolidation using an NMDA glutamate receptor antagonist (MK-801) and a serotonin receptor antagonist (methiothepin, MET) on snails trained with food aversion conditioning. During the early period of amnesia (<10th day), the unpaired presentation of conditioned stimuli (CS) or unconditioned stimuli (US) in the same training context did not have an effect on both types of amnesia. Retraining an on 1st or 3rd day of amnesia induction facilitated memory formation, i.e. the number of CS + US pairings was lower than at initial training. On the 10th or 30th day after the MET/reminder, the number of CS + US pairings did not change between initial training and retraining. Retraining on the 10th or 30th day following the MK-801/reminder in the same or a new context of learning resulted in short, but not long-term, memory, and the number of CS + US pairings was higher than at the initial training. This type of amnesia was specific to the CS we used at initial training, since long-term memory for another kind of CS could be formed in the same snails. The attained results suggest that disruption of memory reconsolidation using antagonists of serotonin or NMDA glutamate receptors induced amnesias with different abilities to form long-term memory during the late period of development.
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Affiliation(s)
- V P Nikitin
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russian Federation.
| | - S V Solntseva
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russian Federation
| | - S A Kozyrev
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russian Federation
| | - P V Nikitin
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russian Federation; Burdenko Neurosurgical Institute, Moscow, Russian Federation
| | - A V Shevelkin
- Department of Psychiatry and Behavioral Sciences, John Hopkins University School of Medicine, Baltimore, MD
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Nikitin VP, Solntseva SV, Kozyrev SA. Anterograde Amnesia Induced by Disruption of Consolidation or Reconsolidation of Long-Term Memory. Bull Exp Biol Med 2017; 164:1-5. [DOI: 10.1007/s10517-017-3912-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Indexed: 01/20/2023]
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Impairment of the serotonergic neurons underlying reinforcement elicits extinction of the repeatedly reactivated context memory. Sci Rep 2016; 6:36933. [PMID: 27841309 PMCID: PMC5107893 DOI: 10.1038/srep36933] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/24/2016] [Indexed: 12/23/2022] Open
Abstract
We analyzed changes in the activity of individually identifiable neurons involved in the networks underlying feeding and withdrawal behaviors in snails before, during, and after aversive learning in vitro. Responses to food in the “reinforcing” serotonergic neurons involved in withdrawal changed significantly after training, implying that these serotonergic cells participate in the reactivation of memory and are involved in the reconsolidation process. In behavioral experiments it was shown that impairment of the functioning of the serotonergic system with the selective neurotoxin 5,7-DiHT did not change the memory, when tested once, but resulted in a complete extinction of the contextual memory after repeated reactivation of memory. Conversely, the cued memory to a specific type of food was significantly reduced but still present. Thus, we conclude that it is only for the context memory, that participation of the “reinforcing” serotonergic neurons in memory retrieval may be the gate condition for the choice between extinction/reconsolidation.
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