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Kozyrev SA, Solntseva SV, Storozheva ZI, Nikitin VP. Epigenetic Processes of DNA Methylation Are Selectively Involved in the Mechanisms of Retrograde and Anteograde Amnesia. Bull Exp Biol Med 2023; 175:427-432. [PMID: 37768459 DOI: 10.1007/s10517-023-05879-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Indexed: 09/29/2023]
Abstract
The participation of DNA methylation processes in the mechanisms of anterograde and retrograde amnesia caused by impaired reconsolidation of conditioned food aversion memory by NMDA glutamate receptor antagonists or serotonin receptor antagonists, respectively, were studied on grape snails. Anterograde amnesia was characterized by impaired formation of long-term memory during repeated learning. Administration of a DNA methyltransferase (DNMT) inhibitor to amnestic animals resulted in accelerated formation of long-term memory during 1 day of repetitive training vs 3 days during initial training. In serotonin-dependent retrograde amnesia, repeated learning without DNMT inhibitor administration or after inhibitor injections led to the formation of long-term memory. The dynamics of memory formation was similar in both cases and did not differ from that during the initial training: the memory was formed within 3 days of training. Thus, epigenetic processes of DNA methylation are selectively involved in the mechanisms of anterograde amnesia, but do not participate in the mechanisms of retrograde amnesia.
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Affiliation(s)
- S A Kozyrev
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - S V Solntseva
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - Z I Storozheva
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - V P Nikitin
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia.
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Solntseva SV, Nikitin VP, Kozyrev SA, Nikitin PV. DNA methylation inhibition participates in the anterograde amnesia key mechanism through the suppression of the transcription of genes involved in memory formation in grape snails. Behav Brain Res 2023; 437:114118. [PMID: 36116736 DOI: 10.1016/j.bbr.2022.114118] [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: 07/12/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 11/16/2022]
Abstract
The study of the amnesia mechanisms is of both theoretical and practical importance. The mechanisms of anterograde amnesia are the least studied, due to the lack of an experimental model that allows studying this amnesia type molecular and cellular mechanisms. Previously, we found that conditional food aversion memory reconsolidation impairment in snails by NMDA glutamate receptor antagonists led to the amnesia induction, in the late stages of which (>10 days) repeated training did not cause long-term memory formation. In the same animals, long-term memory aversion to a new food type was formed. We characterized this amnesia as specific anterograde amnesia. In the present work we studied the role of epigenetic DNA methylation processes as well as protein and mRNA synthesis in the mechanisms of anterograde amnesia and memory recovery. DNMT methyltransferase inhibitors (iDNMT: zebularine, RG108 (N-Phthalyl-1-tryptophan), and 5-AZA (5-Aza-2'-deoxycytidine)) were used to alter DNA methylation. It was found that in amnesic animals the iDNMT administration before or after shortened repeated training led to the rapid long-term conditional food aversion formation (Ebbinghaus saving effect). This result suggests that amnestic animals retain a latent memory, which is the basis for accelerated memory formation during repeated training. Protein synthesis inhibitors administration (cycloheximide) before or immediately after repeated training or administration of RNA synthesis inhibitor (actinomycin D) after repeated training prevented memory formation under iDNMT action. The earlier protein synthesis inhibitor effect suggests that the proteins required for memory formation are translated from the pre-existing, translationally repressed mRNAs. Thus, we have shown for the first time that the anterograde amnesia key mechanism is DNMT-dependent suppression of the transcription of genes involved in memory mechanisms. Inhibition of DNMT during repeated training reversed these genes expression blockade, opening access to them by transcription factors synthesized during training from the pre-existing mRNAs.
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Affiliation(s)
- S V Solntseva
- Laboratory of Functional Neurochemistry, P.K. Anokhin Institute of Normal Physiology, Moscow 125315, Russia.
| | - V P Nikitin
- Laboratory of Functional Neurochemistry, P.K. Anokhin Institute of Normal Physiology, Moscow 125315, Russia.
| | - S A Kozyrev
- Laboratory of Functional Neurochemistry, P.K. Anokhin Institute of Normal Physiology, Moscow 125315, Russia.
| | - P V Nikitin
- Laboratory of Functional Neurochemistry, P.K. Anokhin Institute of Normal Physiology, Moscow 125315, Russia.
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Changes in the Electrical Characteristics of Premotor Interneurons and Serotonin-Containing Modulator Snail Neurons upon Developing a Contextual Conditioned Reflex and Its Reconsolidation. BIONANOSCIENCE 2023. [DOI: 10.1007/s12668-023-01062-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Raut SB, Marathe PA, van Eijk L, Eri R, Ravindran M, Benedek DM, Ursano RJ, Canales JJ, Johnson LR. Diverse therapeutic developments for post-traumatic stress disorder (PTSD) indicate common mechanisms of memory modulation. Pharmacol Ther 2022; 239:108195. [PMID: 35489438 DOI: 10.1016/j.pharmthera.2022.108195] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/19/2022] [Accepted: 04/20/2022] [Indexed: 12/20/2022]
Abstract
Post-traumatic stress disorder (PTSD), characterized by abnormally persistent and distressing memories, is a chronic debilitating condition in need of new treatment options. Current treatment guidelines recommend psychotherapy as first line management with only two drugs, sertraline and paroxetine, approved by U.S. Food and Drug Administration (FDA) for treatment of PTSD. These drugs have limited efficacy as they only reduce symptoms related to depression and anxiety without producing permanent remission. PTSD remains a significant public health problem with high morbidity and mortality requiring major advances in therapeutics. Early evidence has emerged for the beneficial effects of psychedelics particularly in combination with psychotherapy for management of PTSD, including psilocybin, MDMA, LSD, cannabinoids, ayahuasca and ketamine. MDMA and psilocybin reduce barrier to therapy by increasing trust between therapist and patient, thus allowing for modification of trauma related memories. Furthermore, research into the memory reconsolidation mechanisms has allowed for identification of various pharmacological targets to disrupt abnormally persistent memories. A number of pre-clinical and clinical studies have investigated novel and re-purposed pharmacological agents to disrupt fear memory in PTSD. Novel therapeutic approaches like neuropeptide Y, oxytocin, cannabinoids and neuroactive steroids have also shown potential for PTSD treatment. Here, we focus on the role of fear memory in the pathophysiology of PTSD and propose that many of these new therapeutic strategies produce benefits through the effect on fear memory. Evaluation of recent research findings suggests that while a number of drugs have shown promising results in preclinical studies and pilot clinical trials, the evidence from large scale clinical trials would be needed for these drugs to be incorporated in clinical practice.
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Affiliation(s)
- Sanket B Raut
- Schools of Psychological Sciences, College of Health and Medicine, University of Tasmania, TAS 7250, Australia
| | - Padmaja A Marathe
- Department of Pharmacology and Therapeutics, Seth GS Medical College & KEM Hospital, Parel, Mumbai 400 012, India
| | - Liza van Eijk
- Department of Psychology, College of Healthcare Sciences, James Cook University, QLD 4811, Australia
| | - Rajaraman Eri
- Health Sciences, College of Health and Medicine, University of Tasmania, TAS 7250, Australia
| | - Manoj Ravindran
- Medicine, College of Health and Medicine, University of Tasmania, TAS 7250, Australia; Department of Psychiatry, North-West Private Hospital, Burnie TAS 7320, Australia
| | - David M Benedek
- Centre for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services University School of Medicine, Bethesda, MD 20814, USA
| | - Robert J Ursano
- Centre for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services University School of Medicine, Bethesda, MD 20814, USA
| | - Juan J Canales
- Schools of Psychological Sciences, College of Health and Medicine, University of Tasmania, TAS 7250, Australia
| | - Luke R Johnson
- Schools of Psychological Sciences, College of Health and Medicine, University of Tasmania, TAS 7250, Australia; Centre for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services University School of Medicine, Bethesda, MD 20814, USA.
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Nikitin VP, Kozyrev SA, Solntseva SV, Nikitin PV. Protein synthesis inhibitor administration before a reminder caused recovery from amnesia induced by memory reconsolidation impairment with NMDA glutamate receptor antagonist. Brain Res Bull 2021; 171:44-55. [PMID: 33722648 DOI: 10.1016/j.brainresbull.2021.03.008] [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: 10/23/2020] [Revised: 01/19/2021] [Accepted: 03/09/2021] [Indexed: 11/15/2022]
Abstract
Memory recovery in amnestic animals is one of the most poorly studied processes. In this paper, we examine the role of protein synthesis and a reminder in the mechanisms of amnesia and memory recovery in grape snails trained to conditioned food aversion. Amnesia was induced by the impairment of memory reconsolidation using NMDA (N-methyl d-aspartate) glutamate receptor antagonists. In an early stage of amnesia (day 3), injections of protein synthesis inhibitors into animals combined with a reminder by a conditioned stimulus (CS) led to the recovery of aversive reactions to its presentation. Two types of changes in reactions to CS were revealed. In most animals, a persistent recovery of memory retrieval was found that lasted for at least 10 days. In other snails, aversive responses to CS persisted for 24 h. Isolated injections of inhibitors, injections of inhibitors and a reminder by the learning environment (without presenting a CS), usage of a differentiating stimulus instead of a CS, or inhibitor injections after the reminder did not affect the development of amnesia. The administration of protein synthesis inhibitors and a reminder in the late period after amnesia induction (10 days) did not affect its development or caused a short-term memory recovery. We suggest that amnesia is an active process that develops over time. The reminder induces the reactivation of the amnesia process dependent on protein synthesis, while the administration of protein synthesis inhibitors leads to the impairment of amnesia reactivation and recovery of the state formed before amnesia induction (i.e., recovery of conditioned food aversion memory).
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Affiliation(s)
- V P Nikitin
- P.K. Anokhin Institute of Normal Physiology, 125315, Baltiyskaya Street, 8, Moscow, Russia.
| | - S A Kozyrev
- P.K. Anokhin Institute of Normal Physiology, 125315, Baltiyskaya Street, 8, Moscow, Russia.
| | - S V Solntseva
- P.K. Anokhin Institute of Normal Physiology, 125315, Baltiyskaya Street, 8, Moscow, Russia.
| | - P V Nikitin
- P.K. Anokhin Institute of Normal Physiology, 125315, Baltiyskaya Street, 8, Moscow, Russia.
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Thangaleela S, Ragu Varman D, Sivasangari K, Rajan KE. Inhibition of monoamine oxidase attenuates social defeat-induced memory impairment in goldfish, (Carassius auratus): A possible involvement of synaptic proteins and BDNF. Comp Biochem Physiol C Toxicol Pharmacol 2021; 239:108873. [PMID: 32805442 DOI: 10.1016/j.cbpc.2020.108873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 08/11/2020] [Accepted: 08/12/2020] [Indexed: 01/12/2023]
Abstract
Social defeat (SD) has been implicated in different modulatory effects of physiology and behaviour including learning and memory. We designed an experiment to test the functional role of monoamine oxidase (MAO) in regulation of synaptic transmission, synaptic plasticity and memory in goldfish Carassius auratus. To test this, individuals were divided into three groups: (i) control; (ii) social defeat (SD) group (individuals were subjected to social defeat for 10 min by Pseudotropheus demasoni) and (iii) SD + MAO inhibitor pre-treated group. All experimental groups were subjected to spatial learning and then memory. Our results suggest that SD affects a spatial learning and memory, whereas SD exerts no influence on MAOI pre-treated group. In addition, we noted that the expression of monoamine oxidase-A (MAO-A) was up-regulated and level of serotonin (5-hydroxytryptamine; 5-HT), expression of serotonin transporter (SERT), synaptophysin (SYP), synaptotagmin -1 (SYT-1), N-methyl-D-asparate (NMDA) receptors subunits (NR2A and NR2B), postsynaptic density-95 (PSD-95) and brain-derived neurotrophic factor (BDNF) were reduced by SD, while MAOIs pretreatment protects the effect of SD. Taken together, our results suggest that MAO is an essential component in the serotonergic system that finely tunes the level of 5-HT, which further regulates the molecules involving in synaptic transmission, synaptic plasticity and memory.
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Affiliation(s)
- Subramanian Thangaleela
- Behavioural Neuroscience Laboratory, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli 620 024, India
| | - Durairaj Ragu Varman
- Behavioural Neuroscience Laboratory, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli 620 024, India; Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, United States
| | - Karunanithi Sivasangari
- Behavioural Neuroscience Laboratory, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli 620 024, India
| | - Koilmani Emmanuvel Rajan
- Behavioural Neuroscience Laboratory, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli 620 024, India.
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Manganiello-Terra FA, Correa-Netto NF, Masukawa MY, Ruzzi A, Linardi A, Santos-Junior JG. Inhaled Lavandula angustifolia essential oil enhances extinction learning and inhibits memory updating in mice submitted to the contextual fear conditioning. JOURNAL OF ETHNOPHARMACOLOGY 2020; 260:113048. [PMID: 32525067 DOI: 10.1016/j.jep.2020.113048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 05/04/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Lavender (Lavandula angustifolia) essential oil (EO) has a long history of use in emotional illness, including anxiety disorders. Cognitive mechanisms of learning and memory play a pivotal role in the etiology and maintenance of anxiety since exposure to cues related to aversive situations induces high arousal and anticipatory anxiety. Memory become labile after its reactivation and can be modulated by reconsolidation or extinction. Inhibition of memory reconsolidation or facilitation of memory extinction may be effective in preventing or minimizing the effect of contextual cues on anticipatory anxiety. AIM OF THE STUDY We investigated the effect of Lavandula angustifolia EO in the memory updating of conditioned contextual fear. MATERIALS AND METHODS Adult male C57Bl6 mice were submitted to fear conditioning. Two days after conditioning the mice underwent a reactivation session in a hybrid context and were then immediately exposed to vaporized water or essential oil at concentrations of 1%, 2.5% or 5% for 3 h. Two days later, the mice were tested in the original or an altered context and their freezing behavior was measured. In addition, mice were subjected to a fear memory recovery protocol followed by a reinstatement session. RESULTS In the contextual fear test, 1% essential oil, but not 2.5% or 5%, reduced the freezing behavior response, whereas after a reinstatement session, exposure to 1% essential oil increased the freezing behavior response. CONCLUSIONS These results suggest that Lavandula angustifolia essential oil enhances memory extinction and, consequently, inhibits memory updating.
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Affiliation(s)
- Fabiana Aparecida Manganiello-Terra
- Department of Physiological Sciences, Santa Casa of São Paulo Medical School, Rua Cesário Mota Junior, 61, Vila Buarque, 01221-020, São Paulo, SP, Brazil
| | - Nelson Francisco Correa-Netto
- Department of Physiological Sciences, Santa Casa of São Paulo Medical School, Rua Cesário Mota Junior, 61, Vila Buarque, 01221-020, São Paulo, SP, Brazil
| | - Márcia Yuriko Masukawa
- Department of Physiological Sciences, Santa Casa of São Paulo Medical School, Rua Cesário Mota Junior, 61, Vila Buarque, 01221-020, São Paulo, SP, Brazil
| | - André Ruzzi
- Department of Physiological Sciences, Santa Casa of São Paulo Medical School, Rua Cesário Mota Junior, 61, Vila Buarque, 01221-020, São Paulo, SP, Brazil
| | - Alessandra Linardi
- Department of Physiological Sciences, Santa Casa of São Paulo Medical School, Rua Cesário Mota Junior, 61, Vila Buarque, 01221-020, São Paulo, SP, Brazil
| | - Jair Guilherme Santos-Junior
- Department of Physiological Sciences, Santa Casa of São Paulo Medical School, Rua Cesário Mota Junior, 61, Vila Buarque, 01221-020, São Paulo, SP, Brazil.
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Peculiarities in Synthesis of Proteins Implicated in Memory Reconsolidation and Induction of Amnesia. Bull Exp Biol Med 2020; 169:187-191. [DOI: 10.1007/s10517-020-04847-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Indexed: 10/23/2022]
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Deryabina IB, Andrianov VV, Muranova LN, Bogodvid TK, Gainutdinov KL. Effects of Thryptophan Hydroxylase Blockade by P-Chlorophenylalanine on Contextual Memory Reconsolidation after Training of Different Intensity. Int J Mol Sci 2020; 21:E2087. [PMID: 32197439 PMCID: PMC7139692 DOI: 10.3390/ijms21062087] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/13/2020] [Accepted: 03/16/2020] [Indexed: 01/09/2023] Open
Abstract
The processes of memory formation and its storage are extremely dynamic. Therefore, the determination of the nature and temporal evolution of the changes that underlie the molecular mechanisms of retrieval and cause reconsolidation of memory is the key to understanding memory formation. Retrieval induces the plasticity, which may result in reconsolidation of the original memory and needs critical molecular events to stabilize the memory or its extinction. 4-Chloro-DL-phenylalanine (P-chlorophenylalanine-PCPA) depresses the most limiting enzyme of serotonin synthesis the tryptophan hydroxylase. It is known that PCPA reduces the serotonin content in the brain up to 10 times in rats (see Methods). We hypothesized that the PCPA could behave the similar way in snails and could reduce the content of serotonin in snails. Therefore, we investigated the effect of PCPA injection on contextual memory reconsolidation using a protein synthesis blocker in snails after training according to two protocols of different intensities. The results obtained in training according to the first protocol using five electrical stimuli per day for 5 days showed that reminding the training environment against the background of injection of PCPA led to a significant decrease in contextual memory. At the same time, the results obtained in training according to the second protocol using three electrical stimuli per day for 5 days showed that reminding the training environment against the injection of PCPA did not result in a significant change in contextual memory. The obtain results allowed us to conclude that the mechanisms of processes developed during the reconsolidation of contextual memory after a reminding depend both on the intensity of learning and on the state of the serotonergic system.
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Affiliation(s)
- Irina B. Deryabina
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420000 Kazan, Russia; (I.B.D.); (V.V.A.); (L.N.M.); (T.K.B.)
| | - Viatcheslav V. Andrianov
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420000 Kazan, Russia; (I.B.D.); (V.V.A.); (L.N.M.); (T.K.B.)
- Laboratory of Spin Physics and Spin Chemistry, Zavoisky Physical-Technical Institute of the Russian Academy of Sciences, 420000 Kazan, Russia
| | - Lyudmila N. Muranova
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420000 Kazan, Russia; (I.B.D.); (V.V.A.); (L.N.M.); (T.K.B.)
| | - Tatiana K. Bogodvid
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420000 Kazan, Russia; (I.B.D.); (V.V.A.); (L.N.M.); (T.K.B.)
- Department of Biomedical Sciences, Volga Region State Academy of Physical Culture, Sport and Tourism, 420000 Kazan, Russia
| | - Khalil L. Gainutdinov
- Laboratory of Neuroreabilitation of Motor Disorders, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420000 Kazan, Russia; (I.B.D.); (V.V.A.); (L.N.M.); (T.K.B.)
- Laboratory of Spin Physics and Spin Chemistry, Zavoisky Physical-Technical Institute of the Russian Academy of Sciences, 420000 Kazan, Russia
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Aonuma H, Mezheritskiy M, Boldyshev B, Totani Y, Vorontsov D, Zakharov I, Ito E, Dyakonova V. The Role of Serotonin in the Influence of Intense Locomotion on the Behavior Under Uncertainty in the Mollusk Lymnaea stagnalis. Front Physiol 2020; 11:221. [PMID: 32256385 PMCID: PMC7091490 DOI: 10.3389/fphys.2020.00221] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 02/26/2020] [Indexed: 12/24/2022] Open
Abstract
The role of serotonin in the immediate and delayed influence of physical exercise on brain functions has been intensively studied in mammals. Recently, immediate effects of intense locomotion on the decision-making under uncertainty were reported in the Great Pond snail, Lymnaea stagnalis (Korshunova et al., 2016). In this animal, serotonergic neurons control locomotion, and serotonin modulates many processes underlying behavior, including cognitive ones (memory and learning). Whether serotonin mediates the behavioral effects of intense locomotion in mollusks, as it does in vertebrates, remains unknown. Here, the delayed facilitating effects of intense locomotion on the decision-making in the novel environment are described in Lymnaea. Past exercise was found to alter the metabolism of serotonin, namely the content of serotonin precursor and its catabolites in the cerebral and pedal ganglia, as measured by high-performance liquid chromatography. The immediate and delayed effects of exercise on serotonin metabolism were different. Moreover, serotonin metabolism was regulated differently in different ganglia. Pharmacological manipulations of the serotonin content and receptor availability suggests that serotonin is likely to be responsible for the locomotor acceleration in the test of decision-making under uncertainty performed after exercise. However, the exercise-induced facilitation of decision-making (manifested in a reduced number of turns during the orienting behavior) cannot be attributed to the effects of serotonin.
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Affiliation(s)
- Hitoshi Aonuma
- Research Center of Mathematics for Social Creativity, Research Institute for Electronic Science, Hokkaido University, Hokkaido, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Saitama, Japan
| | - Maxim Mezheritskiy
- Koltzov Institute of Developmental Biology of the Russian Academy of Sciences (RAS), Moscow, Russia
| | - Boris Boldyshev
- Trapeznikov Institute of Control Sciences of Russian Academy of Sciences (RAS), Moscow, Russia
| | - Yuki Totani
- Department of Biology, Waseda University, Tokyo, Japan
| | - Dmitry Vorontsov
- Koltzov Institute of Developmental Biology of the Russian Academy of Sciences (RAS), Moscow, Russia
| | - Igor Zakharov
- Koltzov Institute of Developmental Biology of the Russian Academy of Sciences (RAS), Moscow, Russia
| | - Etsuro Ito
- Department of Biology, Waseda University, Tokyo, Japan
| | - Varvara Dyakonova
- Koltzov Institute of Developmental Biology of the Russian Academy of Sciences (RAS), Moscow, Russia
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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. Changes in Amnesia Parameters over Time after Long-Term Memory Disruption with Protein Kinase Mζ Inhibitor. Bull Exp Biol Med 2019; 167:711-715. [PMID: 31655990 DOI: 10.1007/s10517-019-04605-x] [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: 11/28/2018] [Indexed: 11/29/2022]
Abstract
We studied the involvement of protein kinase Mζ (PKMζ) in the mechanisms of amnesia development within 10 days after disruption of conditioned food aversion memory with ZIP (a PKMζ inhibitor). Repeated training performed in 3 days after amnesia induction with ZIP, led to the formation of conditioned food aversion memory, but the number of combined presentations of food and reinforcer stimuli was lower than during the initial training. Repeated training performed in 10 days after amnesia induction also led to memory formation, but the number of combined presentations of the stimuli was similar to that during the initial training. It was hypothesized that at the early stages of ZIP-induced amnesia, residual memory trace can be restored and amplified during repeated training, which led to memory expression at the behavioral level. At the late stages of amnesia, this memory trace was completely erased and repeated training led to the formation of a new memory. Thus, PKMζ inhibition results in the relatively fast impairment of memory retrieval and induces long-term process of memory erasing.
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Affiliation(s)
- V P Nikitin
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia.
| | - S V Solntseva
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - S A Kozyrev
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
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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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Nikitin VP, Solntseva SV, Nikitin PV. Protein synthesis inhibitors induce both memory impairment and its recovery. Behav Brain Res 2018; 360:202-208. [PMID: 30528939 DOI: 10.1016/j.bbr.2018.11.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 11/08/2018] [Accepted: 11/29/2018] [Indexed: 01/03/2023]
Abstract
The involvement of protein synthesis in the mechanisms of conditioned food aversion memory impairment and recovery in grape snails was studied. It was found that protein synthesis inhibitor (cycloheximide) injections before a reminder by the conditioned stimulus (CS) caused amnesia development. Three days after amnesia induction, injections of cycloheximide or another protein synthesis inhibitor, anisomycin, combined with a reminder by four CSs resulted in memory retrieval, which was saved for 24 h. Cycloheximide injections and the administration of one CS as a reminder to an amnestic animals caused the memory expression only in response to this CS, while it was absent the next day. The isolated administration of a reminder or inhibitor injections without a reminder was not effective. It is suggested that amnesia is an active process and that one of its mechanisms may be a protein-dependent amnesia reactivation caused by a reminder. The administration of protein synthesis inhibitors led to impairment of amnesia reactivation and to recovery of the state formed before amnesia induction and thus to the recovery of conditioned food aversion memory.
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Affiliation(s)
- V P Nikitin
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russia
| | - S V Solntseva
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russia
| | - P V Nikitin
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russia; N.N. Burdenko Neurosurgical Institute, Moscow, Russia.
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Wideman CE, Jardine KH, Winters BD. Involvement of classical neurotransmitter systems in memory reconsolidation: Focus on destabilization. Neurobiol Learn Mem 2018; 156:68-79. [DOI: 10.1016/j.nlm.2018.11.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 10/09/2018] [Accepted: 11/01/2018] [Indexed: 10/27/2022]
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