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Inagaki R, Yamakuni T, Saito T, Saido TC, Moriguchi S. Preventive effect of propolis on cognitive decline in Alzheimer's disease model mice. Neurobiol Aging 2024; 139:20-29. [PMID: 38583392 DOI: 10.1016/j.neurobiolaging.2024.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/20/2024] [Accepted: 03/11/2024] [Indexed: 04/09/2024]
Abstract
Brazilian green propolis (propolis) is a chemically complex resinous substance that is a potentially viable therapeutic agent for Alzheimer's disease. Herein, propolis induced a transient increase in intracellular Ca2+ concentration ([Ca2+]i) in Neuro-2A cells; moreover, propolis-induced [Ca2+]i elevations were suppressed prior to 24-h pretreatment with amyloid-β. To reveal the effect of [Ca2+]i elevation on impaired cognition, we performed memory-related behavioral tasks in APP-KI mice relative to WT mice at 4 and 12 months of age. Propolis, at 300-1000 mg/kg/d for 8 wk, significantly ameliorated cognitive deficits in APP-KI mice at 4 months, but not at 12 months of age. Consistent with behavioral observations, injured hippocampal long-term potentiation was markedly ameliorated in APP-KI mice at 4 months of age following repeated propolis administration. In addition, repeated administration of propolis significantly activated intracellular calcium signaling pathway in the CA1 region of APP-KI mice. These results suggest a preventive effect of propolis on cognitive decline through the activation of intracellular calcium signaling pathways in CA1 region of AD mice model.
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Affiliation(s)
- Ryo Inagaki
- Research Center for Pharmaceutical Development, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Tohru Yamakuni
- Research Center of Supercritical Fluid Technology, Graduate School of Engineering, Tohoku University, Sendai, Japan; New Industry Creation Hatchery Center, Tohoku University, Sendai, Japan
| | - Takashi Saito
- Department of Neurocognitive Science, Institute of Brain Science, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Takaomi C Saido
- Laboratory for Proteolytic Neuroscience, RIKEN Brain Science Institute, Saitama, Japan
| | - Shigeki Moriguchi
- Research Center for Pharmaceutical Development, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
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Kong H, Han YY, Yang GL, Li K, Yu L, Xie XK, Xia GY, Wei PJ, Zhang WR, Li CH. Tenuifolin improves learning and memory by regulating long-term potentiation and dendritic structure of hippocampal CA1 area in healthy female mice but not male mice. Behav Brain Res 2024; 466:114974. [PMID: 38554850 DOI: 10.1016/j.bbr.2024.114974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/25/2024] [Accepted: 03/26/2024] [Indexed: 04/02/2024]
Abstract
Polygala tenuifolia Wild is an ancient traditional Chinese medicine. Its main component, tenuifolin (TEN), has been proven to improve cognitive impairment caused by neurodegenerative diseases and ovariectomy. However, there was hardly any pharmacological research about TEN and its potential gender differences. Considering the reduction of TEN on learning and memory dysfunction in ovariectomized animals, therefore, we focused on the impact of TEN in different mice genders in the current study. Spontaneous alternation behavior (SAB), light-dark discrimination, and Morris water maze (MWM) tests were used to evaluate the mice's learning and memory abilities. The field excitatory postsynaptic potential (fEPSP) of the hippocampal CA1 region was recorded using an electrophysiological method, and the morphology of the dendritic structure was examined using Golgi staining. In the behavioral experiments, TEN improved the correct rate in female mice in the SAB test, the correct rate in the light-dark discrimination test, and the number of crossing platforms in the MWM test. Additionally, TEN reduced the latency of female mice rather than male mice in light-dark discrimination and MWM tests. Moreover, TEN could significantly increase the slope of fEPSP in hippocampal Schaffer-CA1 and enhance the total length and the number of intersections of dendrites in the hippocampal CA1 area in female mice but not in male mice. Collectively, the results of the current study showed that TEN improved learning and memory by regulating long-term potentiation (LTP) and dendritic structure of hippocampal CA1 area in female mice but not in males. These findings would help to explore the improvement mechanism of TEN on cognition and expand the knowledge of the potential therapeutic value of TEN in the treatment of cognitive impairment.
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Affiliation(s)
- Heng Kong
- School of Life Science, South China Normal University, Guangzhou, China
| | - Yuan-Yuan Han
- School of Life Science, South China Normal University, Guangzhou, China
| | - Gai-Ling Yang
- School of Life Science, South China Normal University, Guangzhou, China
| | - Kang Li
- School of Life Science, South China Normal University, Guangzhou, China
| | - Lu Yu
- School of Life Science, South China Normal University, Guangzhou, China
| | - Xun-Kai Xie
- School of Life Science, South China Normal University, Guangzhou, China
| | - Guang-Yuan Xia
- School of Life Science, South China Normal University, Guangzhou, China
| | - Peng-Ju Wei
- Institute of Biomedicine and Biotechnology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | | | - Chu-Hua Li
- School of Life Science, South China Normal University, Guangzhou, China.
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Asadi nejad H, Yousefi Nejad A, Akbari S, Naseh M, Shid Moosavi SM, Haghani M. The low and high doses administration of lutein improves memory and synaptic plasticity impairment through different mechanisms in a rat model of vascular dementia. PLoS One 2024; 19:e0302850. [PMID: 38748711 PMCID: PMC11095768 DOI: 10.1371/journal.pone.0302850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 04/12/2024] [Indexed: 05/19/2024] Open
Abstract
BACKGROUND AND AIM Vascular dementia (VD) is a common type of dementia. This study aimed to evaluate the effects of low and high doses of lutein administration in bilateral-carotid vessel occlusion (2VO) rats. EXPERIMENTAL PROCEDURE The rats were divided into the following groups: the control, sham-, vehicle (2VO+V) groups, and two groups after 2VO were treated with lutein 0.5 (2VO+LUT-o.5) and 5mg/kg (2VO+LUT-5). The passive-avoidance and Morris water maze were performed to examine fear and spatial memory. The field-potential recording was used to investigate the properties of basal synaptic transmission (BST), paired-pulse ratio (PPR), as an index for measurement of neurotransmitter release, and long-term potentiation (LTP). The hippocampus was removed to evaluate hippocampal cells, volume, and MDA level. RESULT Treatment with low and high doses improves spatial memory and LTP impairment in VD rats, but only the high dose restores the fear memory, hippocampal cell loss, and volume and MDA level. Interestingly, low-dose, but not high-dose, increased PPR. However, BST recovered only in the high-dose treated group. CONCLUSIONS Treatment with a low dose might affect neurotransmitter release probability, but a high dose affects postsynaptic processes. It seems likely that low and high doses improve memory and LTP through different mechanisms.
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Affiliation(s)
- Hamideh Asadi nejad
- Department of Physiology, The Medical School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Amirhossein Yousefi Nejad
- Faculty of Veterinary Medicine, Department of Veterinary Medicine Islamic Azad University of Kazeroon, Shiraz, Iran
| | - Somayeh Akbari
- Histomorphometry and Stereology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Maryam Naseh
- Histomorphometry and Stereology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | | | - Masoud Haghani
- Department of Physiology, The Medical School, Shiraz University of Medical Sciences, Shiraz, Iran
- Histomorphometry and Stereology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
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Zhang N, Sui Y, Jendrichovsky P, Feng H, Shi H, Zhang X, Xu S, Sun W, Zhang H, Chen X, Tortorella MD, He J. Cholecystokinin B receptor agonists alleviates anterograde amnesia in cholecystokinin-deficient and aged Alzheimer's disease mice. Alzheimers Res Ther 2024; 16:109. [PMID: 38750512 PMCID: PMC11094875 DOI: 10.1186/s13195-024-01472-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 05/01/2024] [Indexed: 05/19/2024]
Abstract
BACKGROUND As one major symptom of Alzheimer's disease (AD), anterograde amnesia describes patients with an inability in new memory formation. The crucial role of the entorhinal cortex in forming new memories has been well established, and the neuropeptide cholecystokinin (CCK) is reported to be released from the entorhinal cortex to enable neocortical associated memory and long-term potentiation. Though several studies reveal that the entorhinal cortex and CCK are related to AD, it is less well studied. It is unclear whether CCK is a good biomarker or further a great drug candidate for AD. METHODS mRNA expressions of CCK and CCK-B receptor (CCKBR) were examined in two mouse models, 3xTg AD and CCK knock-out (CCK-/-) mice. Animals' cognition was investigated with Morris water maze, novel object recognition test and neuroplasticity with in-vitro electrophysiological recording. Drugs were given intraperitoneally to animals to investigate the rescue effects on cognitive deficits, or applied to brain slices directly to explore the influence in inducement of long-term potentiation. RESULTS Aged 3xTg AD mice exhibited reduced CCK mRNA expression in the entorhinal cortex but reduced CCKBR expression in the neocortex and hippocampus, and impaired cognition and neuroplasticity comparable with CCK-/- mice. Importantly, the animals displayed improved performance and enhanced long-term potentiation after the treatment of CCKBR agonists. CONCLUSIONS Here we provide more evidence to support the role of CCK in learning and memory and its potential to treat AD. We elaborated on the rescue effect of a promising novel drug, HT-267, on aged 3xTg AD mice. Although the physiological etiology of CCK in AD still needs to be further investigated, this study sheds light on a potential pharmaceutical candidate for AD and dementia.
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Affiliation(s)
- Nan Zhang
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Hong Kong SAR, 0000, P.R. China
| | - Yixuan Sui
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
| | - Peter Jendrichovsky
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Hemin Feng
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- Department of Neurosurgery, Stanford University, Stanford, CA, 94305, USA
| | - Heng Shi
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Hong Kong SAR, 0000, P.R. China
| | - Xu Zhang
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- National Engineering Laboratory of Big Data System Computing Technology, Shenzhen University, Shenzhen, 518507, P.R. China
| | - Shenghui Xu
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- Laboratory Testing Division, WuXi AppTec (Suzhou) Co., Ltd, Suzhou, 215104, P.R. China
| | - Wenjian Sun
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
- Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA, 90033, USA
| | - Huatang Zhang
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Hong Kong SAR, 0000, P.R. China
| | - Xi Chen
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China
| | - Micky D Tortorella
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Hong Kong SAR, 0000, P.R. China.
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, P.R. China.
| | - Jufang He
- Department of Neuroscience and Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, 0000, P.R. China.
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Anvari S, Javan M, Mirnajafi-Zadeh J, Fathollahi Y. Repeated Morphine Exposure Alters Temporoamonic-CA1 Synaptic Plasticity in Male Rat Hippocampus. Neuroscience 2024; 545:148-157. [PMID: 38513764 DOI: 10.1016/j.neuroscience.2024.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 03/11/2024] [Accepted: 03/16/2024] [Indexed: 03/23/2024]
Abstract
In this study, the electrophysiological and biochemical consequences of repeated exposure to morphine in male rats on glutamatergic synaptic transmission, synaptic plasticity, the expression of GABA receptors and glutamate receptors at the temporoammonic-CA1 synapse along the longitudinal axis of the hippocampus (dorsal, intermediate, ventral, DH, IH, VH, respectively) were investigated. Slice electrophysiological methods, qRT-PCR, and western blotting techniques were used to characterize synaptic plasticity properties. We showed that repeated morphine exposure (RME) reduced excitatory synaptic transmission and ability for long-term potentiation (LTP) in the VH as well as eliminated the dorsoventral difference in paired-pulse responses. A decreased expression of NR2B subunit in the VH and an increased expression GABAA receptor of α1 and α5 subunits in the DH were observed following RME. Furthermore, RME did not affect the expression of NR2A, AMPA receptor subunits, and γ2GABAA and GABAB receptors in either segment of the hippocampus. In sum, the impact of morphine may differ depending on the region of the hippocampus studied. A distinct change in the short- and long-term synaptic plasticity along the hippocampus long axis due to repeated morphine exposure, partially mediated by a change in the expression profile of glutamatergic receptor subunits. These findings can be useful in further understanding the cellular mechanism underlying deficits in information storage and, more generally, cognitive processes resulting from chronic opioid abuse.
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Affiliation(s)
- Sohrab Anvari
- Department of Physiology, School of Medical Sciences, Tarbiat Modares University, PO Box 14115-111, Tehran, Iran
| | - Mohammad Javan
- Department of Physiology, School of Medical Sciences, Tarbiat Modares University, PO Box 14115-111, Tehran, Iran
| | - Javad Mirnajafi-Zadeh
- Department of Physiology, School of Medical Sciences, Tarbiat Modares University, PO Box 14115-111, Tehran, Iran
| | - Yaghoub Fathollahi
- Department of Physiology, School of Medical Sciences, Tarbiat Modares University, PO Box 14115-111, Tehran, Iran.
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He Y, Li J, Yi L, Li X, Luo M, Pang Y, Wang M, Li Z, Xu M, Dong Z, Du Y. Octadecaneuropeptide Ameliorates Cognitive Impairments Through Inhibiting Oxidative Stress in Alzheimer's Disease Models. J Alzheimers Dis 2023; 92:1413-1426. [PMID: 36911940 DOI: 10.3233/jad-221115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
BACKGROUND Alzheimer's disease (AD) is a neurodegenerative disorder characterized by amyloid-β peptide (Aβ) deposition. Aβ accumulation induces oxidative stress, leading to mitochondrial dysfunction, apoptosis, and so forth. Octadecaneuropeptide (ODN), a diazepam-binding inhibitor (DBI)-derived peptide, has been reported to have antioxidant properties. However, it is unclear whether ODN has neuroprotective effects in AD. OBJECTIVE To profile the potential effects of ODN on AD. METHODS We established a mouse model of AD via microinjection of Aβ in the lateral ventricle. Utilizing a combination of western blotting assays, electrophysiological recordings, and behavioral tests, we investigated the neuroprotective effects of ODN on AD. RESULTS DBI expression was decreased in AD model mice and cells. Meanwhile, ODN decreased Aβ generation by downregulating amyloidogenic AβPP processing in HEK-293 cells stably expressing human Swedish mutant APP695 and BACE1 (2EB2). Moreover, ODN could inhibit Aβ-induced oxidative stress in primary cultured cells and mice, as reflected by a dramatic increase in antioxidants and a decrease in pro-oxidants. We also found that ODN could reduce oxidative stress-induced apoptosis by restoring mitochondrial membrane potential, intracellular Ca2+ and cleaved caspase-3 levels in Aβ-treated primary cultured cells and mice. More importantly, intracerebroventricular injection of ODN attenuated cognitive impairments as well as long-term potentiation in Aβ-treated mice. CONCLUSION These results suggest that ODN may exert a potent neuroprotective effect against Aβ-induced neurotoxicity and memory decline via its antioxidant effects, indicating that ODN may be a potential therapeutic agent for AD.
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Affiliation(s)
- Yan He
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Junjie Li
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Liling Yi
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaohuan Li
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Man Luo
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Yayan Pang
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Maoju Wang
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Zhaolun Li
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Mingliang Xu
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Zhifang Dong
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Yehong Du
- Pediatric Research Institute, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
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Stojanovic T, Velarde Gamez D, Schuld GJ, Bormann D, Cabatic M, Uhrin P, Lubec G, Monje FJ. Age-Dependent and Pathway-Specific Bimodal Action of Nicotine on Synaptic Plasticity in the Hippocampus of Mice Lacking the miR-132/212 Genes. Cells 2022; 11:261. [PMID: 35053378 PMCID: PMC8774101 DOI: 10.3390/cells11020261] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 01/06/2022] [Accepted: 01/11/2022] [Indexed: 12/19/2022] Open
Abstract
Nicotine addiction develops predominantly during human adolescence through smoking. Self-administration experiments in rodents verify this biological preponderance to adolescence, suggesting evolutionary-conserved and age-defined mechanisms which influence the susceptibility to nicotine addiction. The hippocampus, a brain region linked to drug-related memory storage, undergoes major morpho-functional restructuring during adolescence and is strongly affected by nicotine stimulation. However, the signaling mechanisms shaping the effects of nicotine in young vs. adult brains remain unclear. MicroRNAs (miRNAs) emerged recently as modulators of brain neuroplasticity, learning and memory, and addiction. Nevertheless, the age-dependent interplay between miRNAs regulation and hippocampal nicotinergic signaling remains poorly explored. We here combined biophysical and pharmacological methods to examine the impact of miRNA-132/212 gene-deletion (miRNA-132/212-/-) and nicotine stimulation on synaptic functions in adolescent and mature adult mice at two hippocampal synaptic circuits: the medial perforant pathway (MPP) to dentate yrus (DG) synapses (MPP-DG) and CA3 Schaffer collaterals to CA1 synapses (CA3-CA1). Basal synaptic transmission and short-term (paired-pulse-induced) synaptic plasticity was unaltered in adolescent and adult miRNA-132/212-/- mice hippocampi, compared with wild-type controls. However, nicotine stimulation promoted CA3-CA1 synaptic potentiation in mature adult (not adolescent) wild-type and suppressed MPP-DG synaptic potentiation in miRNA-132/212-/- mice. Altered levels of CREB, Phospho-CREB, and acetylcholinesterase (AChE) expression were further detected in adult miRNA-132/212-/- mice hippocampi. These observations propose miRNAs as age-sensitive bimodal regulators of hippocampal nicotinergic signaling and, given the relevance of the hippocampus for drug-related memory storage, encourage further research on the influence of miRNAs 132 and 212 in nicotine addiction in the young and the adult brain.
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Affiliation(s)
- Tamara Stojanovic
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria; (D.V.G.); (G.J.S.); (D.B.); (M.C.)
| | - David Velarde Gamez
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria; (D.V.G.); (G.J.S.); (D.B.); (M.C.)
| | - Gabor Jorrid Schuld
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria; (D.V.G.); (G.J.S.); (D.B.); (M.C.)
| | - Daniel Bormann
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria; (D.V.G.); (G.J.S.); (D.B.); (M.C.)
- Laboratory for Cardiac and Thoracic Diagnosis, Department of Surgery, Regeneration and Applied Immunology, Medical University of Vienna, Research Laboratories Vienna General Hospital, Waehringer Guertel 18-20, 1090 Vienna, Austria
- Division of Thoracic Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria
| | - Maureen Cabatic
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria; (D.V.G.); (G.J.S.); (D.B.); (M.C.)
| | - Pavel Uhrin
- Center for Physiology and Pharmacology, Department of Vascular Biology and Thrombosis Research, Medical University of Vienna, 1090 Vienna, Austria;
| | - Gert Lubec
- Department of Neuroproteomics, Paracelsus Medical University, 5020 Salzburg, Austria;
| | - Francisco J. Monje
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria; (D.V.G.); (G.J.S.); (D.B.); (M.C.)
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Borkowski LF, Keilholz AN, Smith CL, Canda KA, Nichols NL. Nonsteroidal anti-inflammatory drug (ketoprofen) delivery differentially impacts phrenic long-term facilitation in rats with motor neuron death induced by intrapleural CTB-SAP injections. Exp Neurol 2022; 347:113892. [PMID: 34634309 PMCID: PMC10805451 DOI: 10.1016/j.expneurol.2021.113892] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 09/05/2021] [Accepted: 10/05/2021] [Indexed: 11/22/2022]
Abstract
Intrapleural injections of cholera toxin B conjugated to saporin (CTB-SAP) selectively eliminates respiratory (e.g., phrenic) motor neurons, and mimics motor neuron death and respiratory deficits observed in rat models of neuromuscular diseases. Additionally, microglial density increases in the phrenic motor nucleus following CTB-SAP. This CTB-SAP rodent model allows us to study the impact of motor neuron death on the output of surviving phrenic motor neurons, and the underlying mechanisms that contribute to enhancing or constraining their output at 7 days (d) or 28d post-CTB-SAP injection. 7d CTB-SAP rats elicit enhanced phrenic long-term facilitation (pLTF) through the Gs-pathway (inflammation-resistant in naïve rats), while pLTF is elicited though the Gq-pathway (inflammation-sensitive in naïve rats) in control and 28d CTB-SAP rats. In 7d and 28d male CTB-SAP rats and controls, we evaluated the effect of cyclooxygenase-1/2 enzymes on pLTF by delivery of the nonsteroidal anti-inflammatory drug, ketoprofen (IP), and we hypothesized that pLTF would be unaffected by ketoprofen in 7d CTB-SAP rats, but pLTF would be enhanced in 28d CTB-SAP rats. In anesthetized, paralyzed and ventilated rats, pLTF was surprisingly attenuated in 7d CTB-SAP rats and enhanced in 28d CTB-SAP rats (both p < 0.05) following ketoprofen delivery. Additionally in CTB-SAP rats: 1) microglia were more amoeboid in the phrenic motor nucleus; and 2) cervical spinal inflammatory-associated factor expression (TNF-α, BDNF, and IL-10) was increased vs. controls in the absence of ketoprofen (p < 0.05). Following ketoprofen delivery, TNF-α and IL-10 expression was decreased back to control levels, while BDNF expression was differentially affected over the course of motor neuron death in CTB-SAP rats. This study furthers our understanding of factors (e.g., cyclooxygenase-1/2-induced inflammation) that contribute to enhancing or constraining pLTF and its implications for breathing following respiratory motor neuron death.
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Affiliation(s)
- Lauren F Borkowski
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA
| | - Amy N Keilholz
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA
| | - Catherine L Smith
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA
| | - Kaylie A Canda
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA
| | - Nicole L Nichols
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA.
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Laha K, Zhu M, Gemperline E, Rau V, Li L, Fanselow MS, Lennertz R, Pearce RA. CPP impairs contextual learning at concentrations below those that block pyramidal neuron NMDARs and LTP in the CA1 region of the hippocampus. Neuropharmacology 2022; 202:108846. [PMID: 34687710 PMCID: PMC8627488 DOI: 10.1016/j.neuropharm.2021.108846] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/29/2021] [Accepted: 10/15/2021] [Indexed: 01/03/2023]
Abstract
Drugs that block N-methyl-d-aspartate receptors (NMDARs) suppress hippocampus-dependent memory formation; they also block long-term potentiation (LTP), a cellular model of learning and memory. However, the fractional block that is required to achieve these effects is unknown. Here, we measured the dose-dependent suppression of contextual memory in vivo by systemic administration of the competitive antagonist (R,S)-3-(2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP); in parallel, we measured the concentration-dependent block by CPP of NMDAR-mediated synapses and LTP of excitatory synapses in hippocampal brain slices in vitro. We found that the dose of CPP that suppresses contextual memory in vivo (EC50 = 2.3 mg/kg) corresponds to a free concentration of 53 nM. Surprisingly, applying this concentration of CPP to hippocampal brain slices had no effect on the NMDAR component of evoked field excitatory postsynaptic potentials (fEPSPNMDA), or on LTP. Rather, the IC50 for blocking the fEPSPNMDA was 434 nM, and for blocking LTP was 361 nM - both nearly an order of magnitude higher. We conclude that memory impairment produced by systemically administered CPP is not due primarily to its blockade of NMDARs on hippocampal pyramidal neurons. Rather, systemic CPP suppresses memory formation by actions elsewhere in the memory-encoding circuitry.
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Affiliation(s)
- Kurt Laha
- Department of Anesthesiology, University of Wisconsin-Madison, Madison, WI, USA.
| | - Mengwen Zhu
- Department of Anesthesiology, University of Wisconsin-Madison, Madison, WI, USA.
| | - Erin Gemperline
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA.
| | - Vinuta Rau
- Department of Anesthesiology, University of California-San Francisco, San Francisco, CA, USA.
| | - Lingjun Li
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA; School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA.
| | - Michael S Fanselow
- Departments of Psychology and Psychiatry, University of California, Los Angeles, Los Angeles, CA, USA.
| | - Richard Lennertz
- Department of Anesthesiology, University of Wisconsin-Madison, Madison, WI, USA.
| | - Robert A Pearce
- Department of Anesthesiology, University of Wisconsin-Madison, Madison, WI, USA.
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Postnikova TY, Diespirov GP, Amakhin DV, Vylekzhanina EN, Soboleva EB, Zaitsev AV. Impairments of Long-Term Synaptic Plasticity in the Hippocampus of Young Rats during the Latent Phase of the Lithium-Pilocarpine Model of Temporal Lobe Epilepsy. Int J Mol Sci 2021; 22:ijms222413355. [PMID: 34948152 PMCID: PMC8705146 DOI: 10.3390/ijms222413355] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/06/2021] [Accepted: 12/10/2021] [Indexed: 12/14/2022] Open
Abstract
Status epilepticus (SE) causes persistent abnormalities in the functioning of neuronal networks, often resulting in worsening epileptic seizures. Many details of cellular and molecular mechanisms of seizure-induced changes are still unknown. The lithium–pilocarpine model of epilepsy in rats reproduces many features of human temporal lobe epilepsy. In this work, using the lithium–pilocarpine model in three-week-old rats, we examined the morphological and electrophysiological changes in the hippocampus within a week following pilocarpine-induced seizures. We found that almost a third of the neurons in the hippocampus and dentate gyrus died on the first day, but this was not accompanied by impaired synaptic plasticity at that time. A diminished long-term potentiation (LTP) was observed following three days, and the negative effect of SE on plasticity increased one week later, being accompanied by astrogliosis. The attenuation of LTP was caused by the weakening of N-methyl-D-aspartate receptor (NMDAR)-dependent signaling. NMDAR-current was more than two-fold weaker during high-frequency stimulation in the post-SE rats than in the control group. Application of glial transmitter D-serine, a coagonist of NMDARs, allows the enhancement of the NMDAR-dependent current and the restoration of LTP. These results suggest that the disorder of neuron–astrocyte interactions plays a critical role in the impairment of synaptic plasticity.
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Xie Y, Song A, Zhu Y, Jiang A, Peng W, Zhang C, Meng X. Effects and mechanisms of probucol on aging-related hippocampus-dependent cognitive impairment. Biomed Pharmacother 2021; 144:112266. [PMID: 34634555 DOI: 10.1016/j.biopha.2021.112266] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/26/2021] [Accepted: 09/27/2021] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND In the present study, we aimed to investigate the effects of probucol on aging-related hippocampus-dependent cognitive impairment and explore the potential mechanisms. METHODS D-galactose (100 mg/kg, once daily for 6 weeks) was subcutaneously injected to induce aging in mice. Then the mice were administered with probucol or vehicle once a day for 2 weeks. The hippocampus-related cognition was evaluated with Morris water maze test, novel object recognition test, and contextual fear conditioning test. Moreover, synaptic plasticity was assessed, and RNA-sequencing was applied to further explore the molecular mechanisms. RESULTS Aging mice induced by D-galactose showed conspicuous learning and memory impairment, which was significantly ameliorated by probucol. Meanwhile, probucol enhanced the spine density and dendritic branches, improved long-term potentiation, and increased the expression of PSD95 of aging mice. Probucol regulated 70 differentially expressed genes compared to D-galactose group, of which 38 genes were upregulated and 32 genes were downregulated. At last, RNA-sequencing results were verified by quantitative reverse transcription-polymerase chain reaction. CONCLUSIONS Probucol improved learning and memory in aging mice through enhancing synaptic plasticity and regulating gene expression, indicating the potential application of probucol to prevent and treat aging-related disorders.
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Affiliation(s)
- Yaru Xie
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; Department of Neurobiology, Institute of Brain Research, School of Basic Medical Sciences, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Anni Song
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yuting Zhu
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Anni Jiang
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Wenpeng Peng
- Department of cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chun Zhang
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Xianfang Meng
- Department of Neurobiology, Institute of Brain Research, School of Basic Medical Sciences, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
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12
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Boondam Y, Tantisira MH, Tilokskulchai K, Tapechum S, Pakaprot N. Acute enhancing effect of a standardized extract of Centella asiatica (ECa 233) on synaptic plasticity: an investigation via hippocampal long-term potentiation. Pharm Biol 2021; 59:367-374. [PMID: 33789075 PMCID: PMC8018467 DOI: 10.1080/13880209.2021.1893348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 02/04/2021] [Accepted: 02/16/2021] [Indexed: 06/12/2023]
Abstract
CONTEXT ECa 233 is the standardized extract of Centella asiatica (L.) Urban. (Apiaceae). It contains at least 85% of triterpenoid glycosides and yields neuroprotective and memory-enhancing effects. However, the exact molecules exerting the effects might be triterpenic acid metabolites reproduced through gut metabolism after orally ingesting C. asiatica, not triterpenoid glycosides. OBJECTIVE This study demonstrates the effect of unmetabolized ECa 233 on hippocampal synaptic plasticity after directly perfusing ECa 233 over acute brain slices. MATERIALS AND METHODS The brain slices obtained from 7-week-old male Wistar rats were randomly divided into 4 groups. We perfused either artificial cerebrospinal fluid (ACSF), 0.01% DMSO, 10 µg/mL ECa 233, or 100 µg/mL on brain slices, and measured the long-term potentiation (LTP) magnitude to determine the synaptic plasticity of hippocampal circuits in each group. RESULTS The LTP magnitude of ACSF, DMSO, 10 ug/mL ECa 233, and 100 ug/mL ECa 233 groups increased from 100% to 181.26 ± 38.19%, 148.74 ± 5.40%, 273.71 ± 56.66%, 182.17 ± 18.61%, respectively. ECa 233 at the concentration of 10 µg/mL robustly and significantly enhanced hippocampal LTP magnitude. The data indicates an improvement of the hippocampal synaptic plasticity. DISCUSSION AND CONCLUSIONS This study emphasizes the effectiveness of triterpenoid glycosides in ECa 233 on synaptic plasticity enhancement. Therefore, this study supported and complimented the known effects of C. asiatica extract on the enhancement of synaptic plasticity, and subsequently, learning and memory, suggesting that ECa 233 could be a promising memory enhancing agent.
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Affiliation(s)
- Yingrak Boondam
- Department of Physiology, Faculty of Pharmacy, Mahidol University, Bangkok, Thailand
| | | | - Kanokwan Tilokskulchai
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Sompol Tapechum
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Narawut Pakaprot
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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13
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Lee YY, Wang M, Son Y, Yang EJ, Kang MS, Kim HJ, Kim HS, Jo J. Oat Extract Avenanthramide-C Reverses Hippocampal Long-Term Potentiation Decline in Tg2576 Mice. Molecules 2021; 26:molecules26206105. [PMID: 34684684 PMCID: PMC8541156 DOI: 10.3390/molecules26206105] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/01/2021] [Accepted: 10/02/2021] [Indexed: 11/16/2022] Open
Abstract
Memory deterioration in Alzheimer’s disease (AD) is thought to be underpinned by aberrant amyloid β (Aβ) accumulation, which contributes to synaptic plasticity impairment. Avenanthramide-C (Avn-C), a polyphenol compound found predominantly in oats, has a range of biological properties. Herein, we performed methanolic extraction of the Avns-rich fraction (Fr. 2) from germinated oats using column chromatography, and examined the effects of Avn-C on synaptic correlates of memory in a mouse model of AD. Avn-C was identified in Fr. 2 based on 1H-NMR analysis. Electrophysiological recordings were performed to examine the effects of Avn-C on the hippocampal long-term potentiation (LTP) in a Tg2576 mouse model of AD. Avn-C from germinated oats restored impaired LTP in Tg2576 mouse hippocampal slices. Furthermore, Avn-C-facilitated LTP was associated with changes in the protein levels of phospho-glycogen synthase kinase-3β (p-GSK3β-S9) and cleaved caspase 3, which are involved in Aβ-induced synaptic impairment. Our findings suggest that the Avn-C extract from germinated oats may be beneficial for AD-related synaptic plasticity impairment and memory decline.
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Affiliation(s)
- Yu-Young Lee
- Department of Central Area, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Korea; (Y.S.); (M.-S.K.); (H.-J.K.)
- Correspondence: (Y.-Y.L.); (H.-S.K.); (J.J.)
| | - Ming Wang
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju 501-757, Korea;
| | - Yurim Son
- Department of Central Area, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Korea; (Y.S.); (M.-S.K.); (H.-J.K.)
| | - Eun-Ju Yang
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, 80 Daehak-ro, Daegu 41566, Korea;
| | - Moon-Seok Kang
- Department of Central Area, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Korea; (Y.S.); (M.-S.K.); (H.-J.K.)
| | - Hyun-Joo Kim
- Department of Central Area, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Korea; (Y.S.); (M.-S.K.); (H.-J.K.)
| | - Hyung-Seok Kim
- Department of Forensic Medicine, Chonnam National University Medical School, Gwangju 501-757, Korea
- Center for Creative Biomedical Scientists, Chonnam National University Medical School, Gwangju 501-757, Korea
- Correspondence: (Y.-Y.L.); (H.-S.K.); (J.J.)
| | - Jihoon Jo
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju 501-757, Korea;
- Correspondence: (Y.-Y.L.); (H.-S.K.); (J.J.)
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14
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Sanderson JL, Freund RK, Gorski JA, Dell'Acqua ML. β-Amyloid disruption of LTP/LTD balance is mediated by AKAP150-anchored PKA and Calcineurin regulation of Ca 2+-permeable AMPA receptors. Cell Rep 2021; 37:109786. [PMID: 34610314 PMCID: PMC8530450 DOI: 10.1016/j.celrep.2021.109786] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 07/02/2021] [Accepted: 09/10/2021] [Indexed: 01/28/2023] Open
Abstract
Regulated insertion and removal of postsynaptic AMPA glutamate receptors (AMPARs) mediates hippocampal long-term potentiation (LTP) and long-term depression (LTD) synaptic plasticity underlying learning and memory. In Alzheimer’s disease β-amyloid (Aβ) oligomers may impair learning and memory by altering AMPAR trafficking and LTP/LTD balance. Importantly, Ca2+-permeable AMPARs (CP-AMPARs) assembled from GluA1 subunits are excluded from hippocampal synapses basally but can be recruited rapidly during LTP and LTD to modify synaptic strength and signaling. By employing mouse knockin mutations that disrupt anchoring of the kinase PKA or phosphatase Calcineurin (CaN) to the postsynaptic scaffold protein AKAP150, we find that local AKAP-PKA signaling is required for CP-AMPAR recruitment, which can facilitate LTP but also, paradoxically, prime synapses for Aβ impairment of LTP mediated by local AKAP-CaN LTD signaling that promotes subsequent CP-AMPAR removal. These findings highlight the importance of PKA/CaN signaling balance and CP-AMPARs in normal plasticity and aberrant plasticity linked to disease. In Alzheimer’s disease, Aβ oligomers disrupt hippocampal neuronal plasticity and cognition. Sanderson et al. show how the postsynaptic scaffold protein AKAP150 coordinates PKA and Calcineurin regulation of Ca2+-permeable AMPA-type glutamate receptors to mediate disruption of synaptic plasticity by Aβ oligomers.
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Affiliation(s)
- Jennifer L Sanderson
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Ronald K Freund
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Jessica A Gorski
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Mark L Dell'Acqua
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA; University of Colorado Alzheimer's and Cognition Center, Anschutz Medical Campus, Aurora, CO 80045, USA; Linda Crnic Institute for Down Syndrome, Anschutz Medical Campus, Aurora, CO 80045, USA.
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15
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Wang C, Yu Q, Li D, Sun N, Huang Y, Zhang YX, Zhou WX. Reduced D-Serine Release May Contribute to Impairment of Long-Term Potentiation by Corticosterone in the Perforant Path-Dentate Gyrus. Neurochem Res 2021; 46:2359-2375. [PMID: 34146194 DOI: 10.1007/s11064-021-03380-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 05/17/2021] [Accepted: 06/15/2021] [Indexed: 01/24/2023]
Abstract
Long-term potentiation (LTP) is a neurobiological mechanism of cognitive function, and the N-methyl-D-aspartate (NMDA) receptors is fundamental for LTP. Previous studies showed that over activation of NMDA receptors may be a crucial cause of LTP and cognitive impairment induced by stress or corticosterone. However, other studies showed that the function of NMDA receptors is insufficient since the NMDA receptors co-agonist D-serine could improve stress-induced cognitive impairment. The purpose of this study is to clarify whether over activation of NMDA receptors or hypofunction of NMDA receptors is involved in hippocampal impairment of LTP by corticosterone and the underlying mechanisms. Results showed that hippocampal LTP and object location recognition memory were impaired in corticosterone-treated mice. Corticosterone increased the glutamate level in hippocampal tissues, neither NMDA receptors antagonist nor its subtype antagonists alleviated impairment of LTP, while enhancing the function of NMDA receptors by D-serine did alleviate impairment of LTP by corticosterone, suggesting that hypofunction of NMDA receptors might be one of the main reasons for impairment of LTP by corticosterone. Further results showed that the level of D-serine and its precursor L-serine did not change. D-serine release-related protein Na+-independent alanine-serine-cysteine transporter-1 (ASC-1) in the cell membrane was decreased and increasing D-serine release by the selective activator of ASC-1 antiporter activity alleviated impairment of LTP by corticosterone. Taken together, this study demonstrates that hypofunction of NMDA receptors may be involved in impairment of LTP by corticosterone and reduced D-serine release may be an important reason for its hypofunction, which is an important complement to existing mechanisms of corticosterone-induced LTP and cognitive impairment.
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Affiliation(s)
- Chen Wang
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China
| | - Qi Yu
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China
| | - Dong Li
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China
| | - Na Sun
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China
| | - Yan Huang
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China.
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China.
| | - Yong-Xiang Zhang
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China.
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China.
| | - Wen-Xia Zhou
- Beijing Institute of Pharmacology and Toxicology, Tai Ping Road 27, Beijing, 100850, China.
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing, China.
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16
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Bilecki W, Wawrzczak-Bargieła A, Majcher-Maślanka I, Chmelova M, Maćkowiak M. Inhibition of BET Proteins during Adolescence Affects Prefrontal Cortical Development: Relevance to Schizophrenia. Int J Mol Sci 2021; 22:ijms22168710. [PMID: 34445411 PMCID: PMC8395847 DOI: 10.3390/ijms22168710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/06/2021] [Accepted: 08/09/2021] [Indexed: 01/10/2023] Open
Abstract
Background: The present study investigated the role of proteins from the bromodomain and extra-terminal (BET) family in schizophrenia-like abnormalities in a neurodevelopmental model of schizophrenia induced by prenatal methylazoxymethanol (MAM) administration (MAM-E17). Methods: An inhibitor of BET proteins, JQ1, was administered during adolescence on postnatal days (P) 23–P29, and behavioural responses (sensorimotor gating, recognition memory) and prefrontal cortical (mPFC) function (long-term potentiation (LTP), molecular and proteomic analyses) studies were performed in adult males and females. Results: Deficits in sensorimotor gating and recognition memory were observed only in MAM-treated males. However, adolescent JQ1 treatment affected animals of both sexes in the control but not MAM-treated groups and reduced behavioural responses in both sexes. An electrophysiological study showed LTP impairments only in male MAM-treated animals, and JQ1 did not affect LTP in the mPFC. In contrast, MAM did not affect activity-dependent gene expression, but JQ1 altered gene expression in both sexes. A proteomic study revealed alterations in MAM-treated groups mainly in males, while JQ1 affected both sexes. Conclusions: MAM-induced schizophrenia-like abnormalities were observed only in males, while adolescent JQ1 treatment affected memory recognition and altered the molecular and proteomic landscape in the mPFC of both sexes. Thus, transient adolescent inhibition of the BET family might prompt permanent alterations in the mPFC.
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17
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Ahmadi N, Mirazi N, Komaki A, Safari S, Hosseini A. Vanillic acid attenuates amyloid β1-40-induced long-term potentiation deficit in male rats: an in vivo investigation. Neurol Res 2021; 43:562-569. [PMID: 33627050 DOI: 10.1080/01616412.2021.1893565] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 02/17/2021] [Indexed: 12/17/2022]
Abstract
Objectives: Alzheimer disease (AD) is a neurodegenerative disorderliness that involves deductible progressive cognition function caused by amyloid-beta (Aβ) peptide accumulation in the interstitial space. The increase of Aβ stimulates all kinds of active oxygen and causes oxidative stress and apoptosis. In this investigation, we researched the neuroprotective impacts of vanillic acid (VA) on the Aβ-induced (Aβ1-40) long-term potentiation (LTP) of the hippocampus - a commonly probed synaptic plasticity model that happens at the same time as memory and learning - in the AD rats.Methods: Forty-five male Wistar rats were categorized into five groups (n = 8 rats/group, 200-220 g), and studied as control (standard diet), sham (vehicle), VA (50 mg/kg), Aβ and Aβ + VA (50 mg/kg) groups. In vivo electrophysiological recordings were implemented after the stereotaxic surgery to gauge the excitatory postsynaptic potential (EPSP) slope and population spike (PS) amplitude in the dentate gyrus of the hippocampus. By the stimulation at high-frequency of the perforate pathway, long-term potentiation (LTP) was induced. To assess the plasma levels of malondialdehyde (MDA) and total thiol group (TTG), blood samples were garnered.Results: In the Aβ-injected rats, EPSP slope, and PS amplitude were significantly reduced after the induction of LTP. Thus, the findings demonstrate that VA decreases the impacts of Aβ on LTP; also, the treatments through VA neuroprotective against the negative effects of Aβ on the synaptic plasticity of the hippocampus can decrease the MDA levels and also increase the TTG levels significantly.Discussion: Therefore, based on this experiment on male rats, VA has neuroprotective effects and antioxidants benefits against the Aβ-mediated inhibition of long-term potentiation.
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Affiliation(s)
- Nesa Ahmadi
- Department of Biology, Faculty of Basic Sciences, Bu-Ali Sina University, Hamedan, Iran
| | - Naser Mirazi
- Department of Biology, Faculty of Basic Sciences, Bu-Ali Sina University, Hamedan, Iran
| | - Alireza Komaki
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Samaneh Safari
- Department of Biology, Faculty of Basic Sciences, Bu-Ali Sina University, Hamedan, Iran
| | - Abdolkarim Hosseini
- Department of Animal Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
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18
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Li XH, Matsuura T, Xue M, Chen QY, Liu RH, Lu JS, Shi W, Fan K, Zhou Z, Miao Z, Yang J, Wei S, Wei F, Chen T, Zhuo M. Oxytocin in the anterior cingulate cortex attenuates neuropathic pain and emotional anxiety by inhibiting presynaptic long-term potentiation. Cell Rep 2021; 36:109411. [PMID: 34289348 DOI: 10.1016/j.celrep.2021.109411] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 05/14/2021] [Accepted: 06/25/2021] [Indexed: 01/29/2023] Open
Abstract
Oxytocin is a well-known neurohypophysial hormone that plays an important role in behavioral anxiety and nociception. Two major forms of long-term potentiation, presynaptic LTP (pre-LTP) and postsynaptic LTP (post-LTP), have been characterized in the anterior cingulate cortex (ACC). Both pre-LTP and post-LTP contribute to chronic-pain-related anxiety and behavioral sensitization. The roles of oxytocin in the ACC have not been studied. Here, we find that microinjections of oxytocin into the ACC attenuate nociceptive responses and anxiety-like behavioral responses in animals with neuropathic pain. Application of oxytocin selectively blocks the maintenance of pre-LTP but not post-LTP. In addition, oxytocin enhances inhibitory transmission and excites ACC interneurons. Similar results are obtained by using selective optical stimulation of oxytocin-containing projecting terminals in the ACC in animals with neuropathic pain. Our results demonstrate that oxytocin acts on central synapses and reduces chronic-pain-induced anxiety by reducing pre-LTP.
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Affiliation(s)
- Xu-Hui Li
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China; Department of Physiology, Faculty of Medicine, University of Toronto, Medical Science Building, 1 King's College Circle, Toronto, ON M5S 1A8, Canada; Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong, China
| | - Takanori Matsuura
- Department of Physiology, Faculty of Medicine, University of Toronto, Medical Science Building, 1 King's College Circle, Toronto, ON M5S 1A8, Canada; Department of Orthopaedics, School of Medicine, University of Occupational and Environmental Health, Yahatanishi-ku, Kitakyushu 807-8555, Japan
| | - Man Xue
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Qi-Yu Chen
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China; Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong, China
| | - Ren-Hao Liu
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Jing-Shan Lu
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China; Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong, China
| | - Wantong Shi
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Kexin Fan
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zhaoxiang Zhou
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zhuang Miao
- Department of Physiology, Faculty of Medicine, University of Toronto, Medical Science Building, 1 King's College Circle, Toronto, ON M5S 1A8, Canada
| | - Jiale Yang
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD 20201, USA
| | - Sara Wei
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD 20201, USA
| | - Feng Wei
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD 20201, USA
| | - Tao Chen
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China; Department of Anatomy, Histology, Embryology & K.K. Leung Brain Research Centre, Fourth Military Medical University, Xi'an 710032, China
| | - Min Zhuo
- Center for Neuron and Disease, Frontier Institutes of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China; Department of Physiology, Faculty of Medicine, University of Toronto, Medical Science Building, 1 King's College Circle, Toronto, ON M5S 1A8, Canada; Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong, China.
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19
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Khodaverdi M, Rahdar M, Davoudi S, Hajisoltani R, Tavassoli Z, Ghasemi Z, Amini AE, Hosseinmardi N, Behzadi G, Janahmadi M. 5-HT7 receptor activation rescues impaired synaptic plasticity in an autistic-like rat model induced by prenatal VPA exposure. Neurobiol Learn Mem 2021; 183:107462. [PMID: 34015444 DOI: 10.1016/j.nlm.2021.107462] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 05/07/2021] [Accepted: 05/12/2021] [Indexed: 01/06/2023]
Abstract
Autism spectrum disorder (ASD) is a severe life-long neuropsychiatric disorder. Alterations and imbalance of several neurochemical systems may be involved in ASD pathophysiology, of them, serotonergic neurotransmission dysfunction and deficiency may underlie behavioral abnormalities associated with ASD. However, the functional importance of serotonergic receptors, particularly 5HT7 receptors in ASD pathology remains poorly defined. Serotonin receptor subtype 7 (5-HT7R) plays a direct regulatory role in the development and also for the mature function of the brain, therefore, further studies are necessary to elucidate the role of these receptors in the etiology of autism. To address this issue, we combined here behavioral, electrophysiological methods to further characterize the contribution of 5-HT7Rs in the prenatal valproic acid (VPA) exposure-induced impairment in synaptic plasticity and their impact on the associated behavioral changes. This may help to unravel the underlying cellular mechanisms involved in ASD and can lead to new treatment and/or prevention therapies based on the role of the serotonergic system for autism. Findings revealed that compared to control, autistic-like offspring showed increased anxiety-like behavior, reduced social interaction, decreased locomotor activity, and impaired identification of the novel object. However, administration of 5-HT7Rs agonist, LP-211, for 7 consecutive days before testing from postnatal day 21 to 27 reversed all behavioral deficits induced by prenatal exposure to VPA in offspring. Also, both short-term depression and long-term potentiation were impaired in the autistic-like pups, but activation of 5-HT7Rs rescued the LTP impairment in the autistic-like group so that there was no significant difference between the two groups. Blockade of 5-HT7Rs caused LTP impairment following HFS in the autistic-like group. Besides, there was a significant difference in LTD induction following SB-269970 application between the control and the autistic-like groups measured at first 10 min following TPS. Moreover, both the number and the size of retrograde fast blue-labelled neurons in the raphe nuclei were reduced. Overall, these results provide for the first time, as far as we know, functional evidence for the restorative role of 5-HT7Rs activation against prenatal VPA exposure induced behavioral deficits and hippocampal synaptic plasticity impairment. Therefore, these receptors could be a potential and promising pharmacotherapy target for the treatment of autism.
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Affiliation(s)
- Maryam Khodaverdi
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mona Rahdar
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Shima Davoudi
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Razieh Hajisoltani
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Zohreh Tavassoli
- Department of Physiology, School of Medicine, Tarbiat Modares University, Tehran, Iran
| | - Zahra Ghasemi
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Aeen Ebrahim Amini
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada; Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Canada
| | - Narges Hosseinmardi
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Gila Behzadi
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mahyar Janahmadi
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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20
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Yao H, Liu W, Liao H, Sheng T, Chen P, Zhou H, Pan Y, Xie J, Zhang Q, Zou Z, Chen Z. Geniposide attenuates postischemic long-term potentiation via GluN2A. Pak J Pharm Sci 2021; 34:909-914. [PMID: 34602413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
N-Methyl-D-aspartate receptor (NMDAR)-induced antioxidation is a significant cause of neuronal injury after ischemic stroke. In a previous work, we verified the neuroprotective roles of geniposide during tMCAO in vivo. However, it remains unknown whether geniposide ameliorates injury to hippocampal neurons during Ischemic Long Term Potentiation (iLTP) induction in vitro. After induction of cells oxygen-glucose deprivation or hydrogen peroxide, the protection of geniposide evaluated by MTT assay and electrophysiological tests. In this study, we suggested neuronal cell apoptosis was attenuated by geniposide. Furthermore, field excitatory postsynaptic potentials (fEPSCs) following postischemic LTP were assessed by electrophysiological tests. Finally, we determined that medium and high doses of geniposide attenuated oxidative stress insult and improved iLTP. Importantly, these effects were abolished by cotreatment with geniposide and the GluN2A antagonist NVP. In contrast, the GluN2B inhibitor ifenprodil failed to have an effect. In conclusion, we suggest for the first time that treatment with geniposide can attenuate postischemic LTP induction in a concentration-dependent manner. We infer that GluN2A-containing NMDARs are involved in the neuroprotection induced by geniposide treatment in ischemia.
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Affiliation(s)
- Hua Yao
- Guangxi Key laboratory of Brain and Cognitive Neuroscience, Guilin Medical University, Guilin, China
| | - Weiqin Liu
- The Affiliated Ganzhou Hospital of Nanchang University, Nanchang, China
| | - Haikang Liao
- College of Life and Environmental Sciences, Wenzhou University, China
| | - Tao Sheng
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China
| | - Panhong Chen
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China
| | - Hongchang Zhou
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China/ Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou Central Hospital, China
| | - Yongliang Pan
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China/ Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou Central Hospital, China
| | - Jinlu Xie
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China
| | - Qinghua Zhang
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China
| | - Zhenyou Zou
- Guangxi Key laboratory of Brain and Cognitive Neuroscience, Guilin Medical University, Guilin, China
| | - Zheng Chen
- Schools of Medicine, Huzhou University, Huzhou Central Hospital, China/ Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou Central Hospital, China
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21
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Hosseini M, Salmani H, Baghcheghi Y. Losartan improved hippocampal long-term potentiation impairment induced by repeated LPS injection in rats. Physiol Rep 2021; 9:e14874. [PMID: 34042283 PMCID: PMC8157761 DOI: 10.14814/phy2.14874] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 04/19/2021] [Accepted: 04/23/2021] [Indexed: 11/24/2022] Open
Abstract
Cognitive impairment has been known as a common consequence of brain inflammation. Long-term potentiation (LTP), the generally accepted cellular mechanism for memory formation in the mammalian brain, has been shown to be suppressed by inflammation. Studies have shown that angiotensin II (Ang II) through the Ang II type 1 receptor (AT1R) has a role in brain and peripheral immune system communication and brain inflammation. Here, the effect of AT1R blockade on hippocampal LTP in rats undergoing repeated lipopolysaccharide (LPS) injection was investigated. Rats received intraperitoneal (ip) injections of LPS (250 μg kg-1 day-1 ) for seven days. Treatment with losartan (ip; 3 mg kg-1 day-1 ) was started 3 days before LPS injection and continued during the LPS injections. Rats were anesthetized, and field excitatory postsynaptic potential (fEPSP) was recorded from the stratum radiatum of the CA1 area of the hippocampus in response to stimulation of the Schaffer collateral pathway. Results showed that LTP was suppressed in the LPS-injected rats as no significant differences were found in the fEPSP slope and amplitude before and after the LTP induction. AT1R blockade by losartan restored fEPSP to the control levels. These findings indicate that Ang II, through AT1R, has a role in LTP suppression induced by systemic inflammation.
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Affiliation(s)
- Mahmoud Hosseini
- Division of Neurocognitive Sciences, Psychiatry and Behavioral Sciences Research CenterMashhad University of Medical SciencesMashhadIran
- Neuroscience Research CenterMashhad University of Medical SciencesMashhadIran
| | - Hossein Salmani
- Applied Biomedical Research CenterMashhad University of Medical SciencesMashhadIran
| | - Yousef Baghcheghi
- Student Research CommitteeJiroft University of Medical SciencesJiroftIran
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22
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Karimi SA, Komaki S, Taheri M, Omidi G, Kourosh-Arami M, Salehi I, Komaki A. Effects of the hydroalcoholic extract of Rosa damascena on hippocampal long-term potentiation in rats fed high-fat diet. J Physiol Sci 2021; 71:14. [PMID: 33926383 PMCID: PMC10717342 DOI: 10.1186/s12576-021-00797-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 03/29/2021] [Indexed: 02/07/2023]
Abstract
High-fat diets (HFDs) and obesity can cause serious health problems, such as neurodegenerative diseases and cognitive impairments. Consumption of HFD is associated with reduction in hippocampal synaptic plasticity. Rosa damascena (R. damascena) is traditionally used as a dietary supplement for many disorders. This study was carried out to determine the beneficial effect of hydroalcoholic extract of R. damascena on in vivo hippocampal synaptic plasticity (long-term potentiation, LTP) in the perforant pathway (PP)-dentate gyrus (DG) pathway in rats fed with an HFD. Male Wistar rats were randomly assigned to four groups: Control, R. damascena extract (1 g/kg bw daily for 30 days), HFD (for 90 days) and HFD + extract. The population spike (PS) amplitude and slope of excitatory post-synaptic potentials (EPSP) were measured in DG area in response to stimulation applied to the PP. Serum oxidative stress biomarkers [total thiol group (TTG) and superoxide dismutase (SOD)] were measured. The results showed the HFD impaired LTP induction in the PP-DG synapses. This conclusion is supported by decreased EPSP slope and PS amplitude of LTP. R. damascena supplementation in HFD animals enhanced EPSP slope and PS amplitude of LTP in the granular cell of DG. Consumption of HFD decreased TTG and SOD. R. damascena extract consumption in the HFD animals enhanced TTG and SOD. These data indicate that R. damascena dietary supplementation can ameliorate HFD-induced alteration of synaptic plasticity, probably through its significant antioxidant effects and activate signalling pathways, which are critical in controlling synaptic plasticity.
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Affiliation(s)
- Seyed Asaad Karimi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
- Department of Neuroscience, School of Science and Advanced Technologies in Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Somayeh Komaki
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Masoumeh Taheri
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Ghazaleh Omidi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Masoumeh Kourosh-Arami
- Department of Neuroscience, School of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
- Neuroscience Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Iraj Salehi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Alireza Komaki
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
- Department of Neuroscience, School of Science and Advanced Technologies in Medicine, Hamadan University of Medical Sciences, Hamadan, Iran.
- Department of Physiology, School of Medicine, Hamadan University of Medical Sciences, Shahid Fahmideh Street, 65178/518, Hamadan, Iran.
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23
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Oh SY, Jang MJ, Choi YH, Hwang H, Rhim H, Lee B, Choi CW, Kim MS. Central administration of afzelin extracted from Ribes fasciculatum improves cognitive and memory function in a mouse model of dementia. Sci Rep 2021; 11:9182. [PMID: 33911138 PMCID: PMC8080596 DOI: 10.1038/s41598-021-88463-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 04/13/2021] [Indexed: 02/07/2023] Open
Abstract
Neurodegenerative disorders are characterized by the decline of cognitive function and the progressive loss of memory. The dysfunctions of the cognitive and memory system are closely related to the decreases in brain-derived neurotrophic factor (BDNF) and cAMP response element-binding protein (CREB) signalings. Ribes fasciculatum, a medicinal plant grown in diverse countries, has been reported to pharmacological effects for autoimmune diseases and aging recently. Here we found that afzelin is a major compound in Ribes fasciculatum. To further examine its neuroprotective effect, the afzelin (100 ng/µl, three times a week) was administered into the third ventricle of the hypothalamus of C57BL/6 mice for one month and scopolamine was injected (i.p.) to these mice to impair cognition and memory before each behavior experiment. The electrophysiology to measure long-term potentiation and behavior tests for cognitive and memory functions were performed followed by investigating related molecular signaling pathways. Chronic administration of afzelin into the brain ameliorated synaptic plasticity and cognitive/memory behaviors in mice given scopolamine. Studies of mice's hippocampi revealed that the response of afzelin was accountable for the restoration of the cholinergic systems and molecular signal transduction via CREB-BDNF pathways. In conclusion, the central administration of afzelin leads to improved neurocognitive and neuroprotective effects on synaptic plasticity and behaviors partly through the increase in CREB-BDNF signaling.
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Affiliation(s)
- So-Young Oh
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Infectious Disease Research Center, Citizen's Health Bureau, Seoul Metropolitan Government, 110, Sejong-daero, Jung-gu, Seoul, 04524, Republic of Korea
| | - Min Jun Jang
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Yun-Hyeok Choi
- Natural Product Research Team, Gyeonggi Biocenter, Gyeonggido Business and Science Accelerator, Gyeonggi-Do, Republic of Korea
| | - Hongik Hwang
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Hyewhon Rhim
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Division of Bio-Medical Science & Technology, University of Science and Technology KIST School, Seoul, Republic of Korea
| | - Bonggi Lee
- Department of Food Science and Nutrition, Pukyong National University, Busan, Republic of Korea
| | - Chun Whan Choi
- Natural Product Research Team, Gyeonggi Biocenter, Gyeonggido Business and Science Accelerator, Gyeonggi-Do, Republic of Korea.
| | - Min Soo Kim
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea.
- Division of Bio-Medical Science & Technology, University of Science and Technology KIST School, Seoul, Republic of Korea.
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24
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Phasuk S, Jasmin S, Pairojana T, Chang HK, Liang KC, Liu IY. Lack of the peroxiredoxin 6 gene causes impaired spatial memory and abnormal synaptic plasticity. Mol Brain 2021; 14:72. [PMID: 33874992 PMCID: PMC8056661 DOI: 10.1186/s13041-021-00779-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 04/06/2021] [Indexed: 02/07/2023] Open
Abstract
Peroxiredoxin 6 (PRDX6) is expressed dominantly in the astrocytes and exerts either neuroprotective or neurotoxic effects in the brain. Although PRDX6 can modulate several signaling cascades involving cognitive functions, its physiological role in spatial memory has not been investigated yet. This study aims to explore the function of the Prdx6 gene in spatial memory formation and synaptic plasticity. We first tested Prdx6-/- mice on a Morris water maze task and found that their memory performance was defective, along with reduced long-term potentiation (LTP) in CA3-CA1 hippocampal synapses recorded from hippocampal sections of home-caged mice. Surprisingly, after the probe test, these knockout mice exhibited elevated hippocampal LTP, higher phosphorylated ERK1/2 level, and decreased reactive astrocyte markers. We further reduced ERK1/2 phosphorylation by administering MEK inhibitor, U0126, into Prdx6-/- mice before the probe test, which reversed their spatial memory deficit. This study is the first one to report the role of PRDX6 in spatial memory and synaptic plasticity. Our results revealed that PRDX6 is necessary for maintaining spatial memory by modulating ERK1/2 phosphorylation and astrocyte activation.
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Affiliation(s)
- Sarayut Phasuk
- Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Sureka Jasmin
- Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien, Taiwan
| | - Tanita Pairojana
- Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan
| | - Hsueh-Kai Chang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Kai-Chi Liang
- Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan
| | - Ingrid Y Liu
- Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan.
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25
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Mai ZF, Cao ZP, Huang SY, Yan WW, Huang JN, Wu BY, Li CH. The metaplastic effects of cordycepin in hippocampal CA1 area of rats. Eur J Pharmacol 2021; 897:173946. [PMID: 33607106 DOI: 10.1016/j.ejphar.2021.173946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/28/2021] [Accepted: 02/11/2021] [Indexed: 11/24/2022]
Abstract
Metaplasticity is referred to adjustment in the requirements for induction of synaptic plasticity based on the prior history of activity. Synaptic plasticity, including long-term potentiation (LTP) and long-term depression (LTD), has been considered to be the neural processes underlying learning and memory. Previous observations that cordycepin (an adenosine derivative) improved learning and memory seemed to be contradictory to the findings that cordycepin inhibited LTP. Therefore, we speculated that the conflicting reports of cordycepin might be related to metaplasticity. In the current study, population spike (PS) in hippocampal CA1 area of rats was recorded by using electrophysiological method in vivo. The results showed that cordycepin reduced PS amplitude in hippocampal CA1 with a concentration-dependent relationship, and high frequency stimulation (HFS) failed to induce LTP when cordycepin was intrahippocampally administrated but improved LTP magnitude when cordycepin was pre-treated. Cordycepin increased LTD induced by activating N-Methyl-D-aspartate (NMDA) receptors and subsequently facilitated LTP induced by HFS. Furthermore, we found that 1,3-dipropyl-8-cyclopentylxanthine (DPCPX), an adenosine A1 receptors antagonist, could block the roles of cordycepin on LTD and LTP. Collectively, cordycepin was able to modulate metaplasticity in hippocampal CA1 area of rats through adenosine A1 receptors. These findings would be helpful to reconcile the conflicting reports in the literatures and provided new insights into the mechanisms underlying cognitive function promotions with cordycepin treatment.
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Affiliation(s)
- Zi-Fan Mai
- School of Life Science, South China Normal University, Guangzhou, 510631, China
| | - Zhi-Ping Cao
- School of Life Science, South China Normal University, Guangzhou, 510631, China
| | - Shu-Yi Huang
- School of Life Science, South China Normal University, Guangzhou, 510631, China
| | - Wen-Wen Yan
- School of Life Science, South China Normal University, Guangzhou, 510631, China
| | - Jun-Ni Huang
- School of Life Science, South China Normal University, Guangzhou, 510631, China
| | - Bao-Yan Wu
- MOE Key Laboratory of Laser Life Science, Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China.
| | - Chu-Hua Li
- School of Life Science, South China Normal University, Guangzhou, 510631, China.
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26
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Zheng Y, Tian C, Dong L, Tian L, Glabonjat RA, Xiong C. Effect of arsenic-containing hydrocarbon on the long-term potentiation at Schaffer Collateral-CA1 synapses from infantile male rat. Neurotoxicology 2021; 84:198-207. [PMID: 33848561 DOI: 10.1016/j.neuro.2021.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/25/2021] [Accepted: 04/07/2021] [Indexed: 01/01/2023]
Abstract
Arsenic-containing hydrocarbons (AsHCs) are common constituents of marine organisms and have potential toxicity to human health. This work is to study the effect of AsHCs on long-term potentiation (LTP) for the first time. A multi-electrode array (MEA) system was used to record the field excitatory postsynaptic potential (fEPSP) of CA1 before and after treatment with AsHC 360 in hippocampal slices from infantile male rats. The element content of Na, K, Ca, Mg, Mn, Cu, Zn, and As in the hippocampal slices were analyzed by elemental mass spectrometry after the neurophysiological experiment. The results showed that low AsHC 360 (1.5 μg As L-1) had no effect on the LTP, moderate AsHC 360 (3.75-15 μg As L-1) enhanced the LTP, and high AsHC 360 (45-150 μg As L-1) inhibited the LTP. The enhancement of the LTP by promoting Ca2+ influx was proved by a Ca2+ gradient experiment. The inhibition of the LTP was likely due to damage of synaptic cell membrane integrity. This study on the neurotoxicity of AsHCs showed that high concentrations have a strong toxic effect on the LTP in hippocampus slices of the infantile male rat, which may lead to a negative effect on the development, learning, and memory.
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Affiliation(s)
- Yu Zheng
- School of Life Sciences, Tiangong University, Tianjin, 300387, China
| | - Chunxiao Tian
- School of Life Sciences, Tiangong University, Tianjin, 300387, China
| | - Lei Dong
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, 300072, China
| | - Lei Tian
- School of Life Sciences, Tiangong University, Tianjin, 300387, China
| | - Ronald A Glabonjat
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032, USA; Institute of Chemistry, NAWI Graz, University of Graz, 8010, Graz, Austria
| | - Chan Xiong
- Institute of Chemistry, NAWI Graz, University of Graz, 8010, Graz, Austria.
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27
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Field M, Dorovykh V, Thomas P, Smart TG. Physiological role for GABA A receptor desensitization in the induction of long-term potentiation at inhibitory synapses. Nat Commun 2021; 12:2112. [PMID: 33837214 PMCID: PMC8035410 DOI: 10.1038/s41467-021-22420-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 03/03/2021] [Indexed: 01/03/2023] Open
Abstract
GABAA receptors (GABAARs) are pentameric ligand-gated ion channels distributed throughout the brain where they mediate synaptic and tonic inhibition. Following activation, these receptors undergo desensitization which involves entry into long-lived agonist-bound closed states. Although the kinetic effects of this state are recognised and its structural basis has been uncovered, the physiological impact of desensitization on inhibitory neurotransmission remains unknown. Here we describe an enduring form of long-term potentiation at inhibitory synapses that elevates synaptic current amplitude for 24 h following desensitization of GABAARs in response to agonist exposure or allosteric modulation. Using receptor mutants and allosteric modulators we demonstrate that desensitization of GABAARs facilitates their phosphorylation by PKC, which increases the number of receptors at inhibitory synapses. These observations provide a physiological relevance to the desensitized state of GABAARs, acting as a signal to regulate the efficacy of inhibitory synapses during prolonged periods of inhibitory neurotransmission.
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Affiliation(s)
- Martin Field
- Department of Neuroscience, Physiology and Pharmacology, UCL, London, UK
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - Valentina Dorovykh
- Department of Neuroscience, Physiology and Pharmacology, UCL, London, UK
| | - Philip Thomas
- Department of Neuroscience, Physiology and Pharmacology, UCL, London, UK
| | - Trevor G Smart
- Department of Neuroscience, Physiology and Pharmacology, UCL, London, UK.
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28
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Speck AE, Aguiar AS, Ferreira SG, Silva HB, Tomé ÂR, Agostinho P, Cunha RA, Prediger RD. Exercise decreases aberrant corticostriatal plasticity in an animal model of l-DOPA-induced dyskinesia. Am J Physiol Regul Integr Comp Physiol 2021; 320:R541-R546. [PMID: 33533311 DOI: 10.1152/ajpregu.00295.2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 01/27/2021] [Indexed: 11/22/2022]
Abstract
Physical exercise attenuates the development of l-3,4-dihydroxyphenylalanine (l-DOPA)-induced dyskinesia (LID) in 6-hydroxydopamine-induced hemiparkinsonian mice through unknown mechanisms. We now tested if exercise normalizes the aberrant corticostriatal neuroplasticity associated with experimental murine models of LID. C57BL/6 mice received two unilateral intrastriatal injections of 6-hydroxydopamine (12 μg) and were treated after 3 wk with l-DOPA/benserazide (25/12.5 mg/kg) for 4 wk, with individualized moderate-intensity running (60%-70% V̇o2peak) or not (untrained). l-DOPA converted the pattern of plasticity in corticostriatal synapses from a long-term depression (LTD) into a long-term potentiation (LTP). Exercise reduced LID severity and decreased aberrant LTP. These results suggest that exercise attenuates abnormal corticostriatal plasticity to decrease LID.
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Affiliation(s)
- Ana E Speck
- Experimental Laboratory of Neurodegenerative Disease, Department of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Aderbal S Aguiar
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Biology of Exercise Lab, Department of Health Sciences, Federal University of Santa Catarina (UFSC), Araranguá, Brazil
| | - Samira G Ferreira
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Henrique B Silva
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Ângelo R Tomé
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Paula Agostinho
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Rodrigo A Cunha
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Rui D Prediger
- Experimental Laboratory of Neurodegenerative Disease, Department of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
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Chen G, Yu G, Yong Z, Yan H, Su R, Wang H. A large dose of methamphetamine inhibits drug‑evoked synaptic plasticity via ER stress in the hippocampus. Mol Med Rep 2021; 23:278. [PMID: 33576466 DOI: 10.3892/mmr.2021.11917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 01/13/2021] [Indexed: 11/06/2022] Open
Abstract
Drug addiction is a chronic and recurrent disease associated with learning and memory. Shaped by drug use and cues from the environment, drug memory serves a key role in drug‑seeking behaviour. Methamphetamine (MA), a globally abused drug, causes cognitive impairment, and endoplasmic reticulum (ER) stress is one of the mechanisms via which this occurs. In the current study, it was hypothesized that ER stress may serve a role in the disturbance of drug memory. The present study demonstrated that 5 mg/kg MA inhibited conditioned place preference behaviour via ER stress, which caused a disruption in long‑term potentiation in the hippocampus. When mice were pre‑treated with the ER stress inhibitors 4‑phenyl butyric acid or tauroursodeoxycholic acid, drug‑evoked synaptic plasticity was induced. Western blotting results indicated that treatment with 5 mg/kg MA enhanced the expression of cyclin‑dependent kinase‑5 and decreased the expression of Ca2+/calmodulin‑dependent protein kinase II α via ER stress. Collectively, the present results suggested that a large dose of MA inhibited drug‑evoked synaptic plasticity and disrupted drug memory by inducing ER stress.
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Affiliation(s)
- Guang Chen
- School of Forensic Medicine, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Gang Yu
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, P.R. China
| | - Zheng Yong
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, P.R. China
| | - Hui Yan
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, P.R. China
| | - Ruibin Su
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, P.R. China
| | - Huijun Wang
- School of Forensic Medicine, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
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Lee U, Ryu SH, Chang S. SCAMP5 mediates activity-dependent enhancement of NHE6 recruitment to synaptic vesicles during synaptic plasticity. Mol Brain 2021; 14:47. [PMID: 33663553 PMCID: PMC7934559 DOI: 10.1186/s13041-021-00763-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 02/24/2021] [Indexed: 01/02/2023] Open
Abstract
Na+(K+)/H+ exchanger 6 (NHE6) on synaptic vesicle (SV) is critical for the presynaptic regulation of quantal size at the glutamatergic synapses by converting the chemical gradient (ΔpH) into membrane potential (Δψ) across the SV membrane. We recently found that NHE6 directly interacts with secretory carrier membrane protein 5 (SCAMP5), and SCAMP5-dependent recruitment of NHE6 to SVs controls the strength of synaptic transmission by modulation of quantal size of glutamate release at rest. It is, however, unknown whether NHE6 recruitment by SCAMP5 plays a role during synaptic plasticity. Here, we found that the number of NHE6-positive presynaptic boutons was significantly increased by the chemical long-term potentiation (cLTP). Since cLTP involves new synapse formation, our results indicated that NHE6 was recruited not only to the existing presynaptic boutons but also to the newly formed presynaptic boutons. Knock down of SCAMP5 completely abrogated the enhancement of NHE6 recruitment by cLTP. Interestingly, despite an increase in the number of NHE6-positive boutons by cLTP, the quantal size of glutamate release at the presynaptic terminals remained unaltered. Together with our recent results, our findings indicate that SCAMP5-dependent recruitment of NHE6 plays a critical role in manifesting presynaptic efficacy not only at rest but also during synaptic plasticity. Since both are autism candidate genes, reduced presynaptic efficacy by interfering with their interaction may underlie the molecular mechanism of synaptic dysfunction observed in autism.
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Affiliation(s)
- Unghwi Lee
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, # 309 Medical Science Bldg, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - Seung Hyun Ryu
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, # 309 Medical Science Bldg, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - Sunghoe Chang
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, # 309 Medical Science Bldg, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.
- Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, 03080, South Korea.
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Liao Z, Li J, Miao L, Huang Z, Huang W, Liu Y, Li Y. Inhibition of RhoA Activity Does Not Rescue Synaptic Development Abnormalities and Long-Term Cognitive Impairment After Sevoflurane Exposure. Neurochem Res 2021; 46:468-481. [PMID: 33237472 DOI: 10.1007/s11064-020-03180-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 11/09/2020] [Accepted: 11/12/2020] [Indexed: 12/23/2022]
Abstract
General anesthetics interfere with dendritic development and synaptogenesis, resulting in cognitive impairment in the developing animals. RhoA signal pathway plays important roles in dendritic development by regulating cytoskeleton protein such as tubulin and actin. However, it's not clear whether RhoA pathway is involved in inhaled general anesthetics sevoflurane-induced synaptic development abnormalities and long-term cognitive dysfunction. Rats at postnatal day 7 (PND7) were injected intraperitoneally with RhoA pathway inhibitor Y27632 or saline 20 min before exposed to 2.8% sevoflurane for 4 h. The apoptosis-related proteins and RhoA/CRMP2 pathway proteins in the hippocampus were measured 6 h after sevoflurane exposure. Cognitive functions were evaluated by the open field test on PND25 rats and contextual fear conditioning test on PND32-33 rats. The dendritic morphology and density of dendritic spines in the pyramidal neurons of hippocampus were determined by Golgi staining and the synaptic plasticity-related proteins were also measured on PND33 rats. Long term potentiation (LTP) from hippocampal slices was recorded on PND34-37 rats. Sevoflurane induced caspase-3 activation, decreased the ratio of Bcl-2/Bax and increased TUNEL-positive neurons in hippocampus of PND7 rats, which were attenuated by inhibition of RhoA. However, sevoflurane had no significant effects on activity of RhoA/CRMP2 pathway. Sevoflurane disturbed dendritic morphogenesis, reduced the number of dendritic spines, decreased proteins expression of PSD-95, drebrin and synaptophysin, inhibited LTP in hippocampal slices and impaired memory ability in the adolescent rats, while inhibition of RhoA activity did not rescue the changes above induced by sevoflurane. RhoA signal pathway did not participate in sevoflurane-induced dendritic and synaptic development abnormalities and cognitive dysfunction in developing rats.
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Affiliation(s)
- Zhaoxia Liao
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Junhua Li
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Liping Miao
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Zeqi Huang
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Wujian Huang
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Yafang Liu
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Yujuan Li
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang West Road, Guangzhou, 510120, China.
- Guangdong Province Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China.
- Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China.
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Guo Y, Zou G, Qi K, Jin J, Yao L, Pan Y, Xiong W. Simvastatin impairs hippocampal synaptic plasticity and cognitive function in mice. Mol Brain 2021; 14:41. [PMID: 33627175 PMCID: PMC7905661 DOI: 10.1186/s13041-021-00758-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 02/19/2021] [Indexed: 12/11/2022] Open
Abstract
Lipophilic statins which are blood brain barrier (BBB) permeable are speculated to affect the cholesterol synthesis and neural functions in the central nervous system. However, whether these statins can affect cholesterol levels and synaptic plasticity in hippocampus and the in vivo consequence remain unclear. Here, we report that long-term subcutaneous treatments of simvastatin significantly impair mouse hippocampal synaptic plasticity, reflected by the attenuated long-term potentiation of field excitatory postsynaptic potentials. The simvastatin administration causes a deficiency in recognition and spatial memory but fails to affect motor ability and anxiety behaviors in the mice. Mass spectrometry imaging indicates a significant decrease in cholesterol intensity in hippocampus of the mice receiving chronic simvastatin treatments. Such effects of simvastatin are transient because drug discontinuation can restore the hippocampal cholesterol level and synaptic plasticity and the memory function. These findings may provide further clues to elucidate the mechanisms of neurological side effects, especially the brain cognitive function impairment, caused by long-term usage of BBB-permeable statins.
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Affiliation(s)
- Yujun Guo
- Department of Neurosurgery, Institute On Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Hefei National Laboratory for Physical Sciences At the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Guichang Zou
- Department of Neurosurgery, Institute On Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Hefei National Laboratory for Physical Sciences At the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Keke Qi
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China
| | - Jin Jin
- Department of Neurosurgery, Institute On Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Hefei National Laboratory for Physical Sciences At the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Lei Yao
- Department of Neurosurgery, Institute On Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Hefei National Laboratory for Physical Sciences At the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Yang Pan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China
| | - Wei Xiong
- Department of Neurosurgery, Institute On Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Hefei National Laboratory for Physical Sciences At the Microscale, University of Science and Technology of China, Hefei, 230026, China.
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, 100070, China.
- Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, 200031, China.
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Boccella S, Guida F, Iannotta M, Iannotti FA, Infantino R, Ricciardi F, Cristiano C, Vitale RM, Amodeo P, Marabese I, Belardo C, de Novellis V, Paino S, Palazzo E, Calignano A, Di Marzo V, Maione S, Luongo L. 2-Pentadecyl-2-oxazoline ameliorates memory impairment and depression-like behaviour in neuropathic mice: possible role of adrenergic alpha2- and H3 histamine autoreceptors. Mol Brain 2021; 14:28. [PMID: 33557888 PMCID: PMC7871413 DOI: 10.1186/s13041-020-00724-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 12/28/2020] [Indexed: 12/20/2022] Open
Abstract
Neuropathic pain (NP) remains an untreatable disease due to the complex pathophysiology that involves the whole pain neuraxis including the forebrain. Sensory dysfunctions such as allodynia and hyperalgesia are only part of the symptoms associated with neuropathic pain that extend to memory and affectivity deficits. The development of multi-target molecules might be a promising therapeutic strategy against the symptoms associated with NP. 2-pentadecyl-2-oxazoline (PEA-OXA) is a plant-derived agent, which has shown effectiveness against chronic pain and associated neuropsychiatric disorders. The molecular mechanisms by which PEA-OXA exerts its effects are, however, only partially known. In the current study, we show that PEA-OXA, besides being an alpha2 adrenergic receptor antagonist, also acts as a modulator at histamine H3 receptors, and report data on its effects on sensory, affective and cognitive symptoms associated with the spared nerve injury (SNI) model of neuropathic pain in mice. Treatment for 14 days with PEA-OXA after the onset of the symptoms associated with neuropathic pain resulted in the following effects: (i) allodynia was decreased; (ii) affective/cognitive impairment associated with SNI (depression, spatial, and working memories) was counteracted; (iii) long-term potentiation in vivo in the lateral entorhinal cortex-dentate gyrus (perforant pathway, LPP) was ameliorated, (iv) hippocampal glutamate, GABA, histamine, norepinephrine and dopamine level alterations after peripheral nerve injury were reversed, (v) expression level of the TH positive neurons in the Locus Coeruleus were normalized. Thus, a 16-day treatment with PEA-OXA alleviates the sensory, emotional, cognitive, electrophysiological and neurochemical alterations associated with SNI-induced neuropathic pain.
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Affiliation(s)
- Serena Boccella
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Francesca Guida
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Monica Iannotta
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Fabio Arturo Iannotti
- Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy
| | - Rosmara Infantino
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Flavia Ricciardi
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Claudia Cristiano
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Naples, Italy
| | | | - Pietro Amodeo
- Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy
| | - Ida Marabese
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Carmela Belardo
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Vito de Novellis
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Salvatore Paino
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Enza Palazzo
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
| | - Antonio Calignano
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Naples, Italy
| | - Vincenzo Di Marzo
- Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy
- Canada Excellence Research Chair on the Microbiome-Endocannabinoidome Axis in Metabolic Health, Université Laval, Quebec City, Canada
| | - Sabatino Maione
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy
- IRCSS, Neuromed, Pozzilli, Italy
| | - Livio Luongo
- Department of Experimental Medicine, Pharmacology Division, University of Campania "L. Vanvitelli", 80138, Naples, Italy.
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry, CNR, Pozzuoli, Italy.
- IRCSS, Neuromed, Pozzilli, Italy.
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Yu J, Cho E, Kwon H, Jeon J, Seong Sin J, Kwon Park J, Kim JS, Woong Choi J, Jin Park S, Jun M, Choon Lee Y, Hoon Ryu J, Lee J, Moon M, Lee S, Hyun Cho J, Hyun Kim D. Akt and calcium-permeable AMPA receptor are involved in the effect of pinoresinol on amyloid β-induced synaptic plasticity and memory deficits. Biochem Pharmacol 2021; 184:114366. [PMID: 33310049 DOI: 10.1016/j.bcp.2020.114366] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/08/2020] [Accepted: 12/08/2020] [Indexed: 12/22/2022]
Abstract
Alzheimer's disease (AD) is one of the most prevalent neurodegenerative disorders characterized by memory deficits. Although no drug has given promising results, synaptic dysfunction-modulating agents might be considered potential candidates for alleviating this disorder. Pinoresinol, a lignan found in Forsythia suspensa, is a memory-enhancing agent with excitatory synaptic activation. In the present study, we tested whether pinoresinol reduces learning and memory and excitatory synaptic deficits in an amyloid β (Aβ)-induced AD-like mouse model. Pinoresinol enhanced hippocampal long-term potentiation (LTP) through calcium-permeable AMPA receptor, which was mediated by Akt activation. Moreover, pinoresinol ameliorated LTP deficits in amyloid β (Aβ)-treated hippocampal slices via Akt signaling. Oral administration of pinoresinol ameliorated Aβ-induced memory deficits without sensory dysfunction. Moreover, AD-like pathology, including neuroinflammation and synaptic deficit, were ameliorated by pinoresinol administration. Collectively, pinoresinol may be a good candidate for AD therapy by modulating synaptic functions.
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Affiliation(s)
- Jimin Yu
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Eunbi Cho
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Huiyoung Kwon
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Jieun Jeon
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Jae Seong Sin
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Jun Kwon Park
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Ji-Su Kim
- Primate Resources Center (PRC), Korea Research Institute of Bioscience and Biotechnology (KRIBB), Jeongup-si, Jeollabuk-do 56216, Republic of Korea
| | - Ji Woong Choi
- College of Pharmacy and Gachon Institute of Pharmaceutical Sciences, Gachon University, Incheon 21936, Republic of Korea
| | - Se Jin Park
- School of Natural Resources and Environmental Sciences, Kangwon National University, Chuncheon, Republic of Korea
| | - Mira Jun
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Young Choon Lee
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea; Department of Biochemistry, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea
| | - Jong Hoon Ryu
- Department of Oriental Pharmaceutical Science, College of Pharmacy, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jeongwon Lee
- Department of Marine Life Science, Jeju National University, Jeju, Republic of Korea
| | - Minho Moon
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea
| | - Seungheon Lee
- Department of Marine Life Science, Jeju National University, Jeju, Republic of Korea.
| | - Jong Hyun Cho
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea; Laboratory of Anti-viral Drug Discovery, Dong-A University, Busan, Republic of Korea.
| | - Dong Hyun Kim
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea; Laboratory of Anti-viral Drug Discovery, Dong-A University, Busan, Republic of Korea; Institute of Convergence Bio-Health, Dong-A University, Busan, Republic of Korea.
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Garad M, Edelmann E, Leßmann V. Impairment of Spike-Timing-Dependent Plasticity at Schaffer Collateral-CA1 Synapses in Adult APP/PS1 Mice Depends on Proximity of Aβ Plaques. Int J Mol Sci 2021; 22:1378. [PMID: 33573114 PMCID: PMC7866519 DOI: 10.3390/ijms22031378] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 12/16/2022] Open
Abstract
Alzheimer's disease (AD) is a multifaceted neurodegenerative disorder characterized by progressive and irreversible cognitive decline, with no disease-modifying therapy until today. Spike timing-dependent plasticity (STDP) is a Hebbian form of synaptic plasticity, and a strong candidate to underlie learning and memory at the single neuron level. Although several studies reported impaired long-term potentiation (LTP) in the hippocampus in AD mouse models, the impact of amyloid-β (Aβ) pathology on STDP in the hippocampus is not known. Using whole cell patch clamp recordings in CA1 pyramidal neurons of acute transversal hippocampal slices, we investigated timing-dependent (t-) LTP induced by STDP paradigms at Schaffer collateral (SC)-CA1 synapses in slices of 6-month-old adult APP/PS1 AD model mice. Our results show that t-LTP can be induced even in fully developed adult mice with different and even low repeat STDP paradigms. Further, adult APP/PS1 mice displayed intact t-LTP induced by 1 presynaptic EPSP paired with 4 postsynaptic APs (6× 1:4) or 1 presynaptic EPSP paired with 1 postsynaptic AP (100× 1:1) STDP paradigms when the position of Aβ plaques relative to recorded CA1 neurons in the slice were not considered. However, when Aβ plaques were live stained with the fluorescent dye methoxy-X04, we observed that in CA1 neurons with their somata <200 µm away from the border of the nearest Aβ plaque, t-LTP induced by 6× 1:4 stimulation was significantly impaired, while t-LTP was unaltered in CA1 neurons >200 µm away from plaques. Treatment of APP/PS1 mice with the anti-inflammatory drug fingolimod that we previously showed to alleviate synaptic deficits in this AD mouse model did not rescue the impaired t-LTP. Our data reveal that overexpression of APP and PS1 mutations in AD model mice disrupts t-LTP in an Aβ plaque distance-dependent manner, but cannot be improved by fingolimod (FTY720) that has been shown to rescue conventional LTP in CA1 of APP/PS1 mice.
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Affiliation(s)
- Machhindra Garad
- Institute of Physiology, Medical Faculty, Otto-von-Guericke University Magdeburg, 39120 Magdeburg, Germany; (M.G.); (E.E.)
| | - Elke Edelmann
- Institute of Physiology, Medical Faculty, Otto-von-Guericke University Magdeburg, 39120 Magdeburg, Germany; (M.G.); (E.E.)
- Center for Behavioral Brain Sciences (CBBS), 39120 Magdeburg, Germany
| | - Volkmar Leßmann
- Institute of Physiology, Medical Faculty, Otto-von-Guericke University Magdeburg, 39120 Magdeburg, Germany; (M.G.); (E.E.)
- Center for Behavioral Brain Sciences (CBBS), 39120 Magdeburg, Germany
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Sonneborn A, Greene RW. Norepinephrine transporter antagonism prevents dopamine-dependent synaptic plasticity in the mouse dorsal hippocampus. Neurosci Lett 2021; 740:135450. [PMID: 33127445 PMCID: PMC7725138 DOI: 10.1016/j.neulet.2020.135450] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/14/2020] [Accepted: 10/08/2020] [Indexed: 12/13/2022]
Abstract
The rodent dorsal hippocampus is essential for episodic memory consolidation, a process heavily modulated by dopamine D1-like receptor (D1/5R) activation. It was previously thought that the ventral tegmental area provided the only supply of dopamine release to dorsal hippocampus, but several recent studies have established the locus coeruleus (LC) as the major source for CA1. Here we show that selective blockade of the norepinephrine transporter (NET) prevents dopamine-dependent, late long-term synaptic potentiation (LTP) in dorsal CA1, a neural correlate of memory formation that relies on LC-mediated activation of D1/5Rs. Since dopamine activation of D1/5Rs by vesicular release is expected to be enhanced by NET antagonism, our data identify NET reversal as a plausible mechanism for LC-mediated DA release. We also show that genetic deletion of LC NMDA receptors (NMDARs) blocks D1R-mediated LTP, suggesting the requirement of both a functional NET and presynaptic NMDARs for this release. As LC activity is highly correlated with attentional processes and memory, these experiments provide insight into how selective attention influences memory formation at the synaptic and circuit levels.
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Affiliation(s)
- Alex Sonneborn
- Department of Psychiatry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75205, USA; Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75205, USA.
| | - Robert W Greene
- Department of Psychiatry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75205, USA; Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75205, USA.
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Li Y, Rong J, Zhong H, Liang M, Zhu C, Chang F, Zhou R. Prenatal Stress Leads to the Altered Maturation of Corticostriatal Synaptic Plasticity and Related Behavioral Impairments Through Epigenetic Modifications of Dopamine D2 Receptor in Mice. Mol Neurobiol 2021; 58:317-328. [PMID: 32935231 DOI: 10.1007/s12035-020-02127-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 09/08/2020] [Indexed: 12/31/2022]
Abstract
Prenatal stress (PRS) had a long-term adverse effect on motor behaviors. Corticostriatal synaptic plasticity, a cellular basis for motor controlling, has been proven to participate in the pathogenesis of many behavior disorders. Based on the reports about the involvement of epigenetic DNA alterations in PRS-induced long-term effects, this research investigated the influence of PRS on the development and maturation of corticostriatal synaptic plasticity and related behaviors and explored the underlying epigenetic mechanism. Subjects were male offspring of dams that were exposed to stress three times per day from the 10th day of pregnancy until delivery. The development and maturation of plasticity at corticostriatal synapses, dopamine signaling, behavioral habituation, and DNA methylation were examined and analyzed. Control mice expressed long-term potentiation (LTP) at corticostriatal synapses during postnatal days (PD) 12-14 and produced long-term depression (LTD) during PD 20-60. However, PRS mice exhibited sustained LTP during PD 12-60. The treatment with dopamine 2 receptor (D2R) agonist quinpirole recovered striatal LTD and improved the impaired behavioral habituation in PD 45 adult PRS mice. Additionally, adult PRS mice showed reduced D2R, excess DNA methyltransferase 1 (DNMT1), increased binding of DNMT1 to D2R promoter, and hypermethylation at D2R promoter in the striatum. The DNMT1 inhibitor 5-aza-deoxycytidine restored striatal synaptic plasticity and improved behavioral habituation in adult PRS mice via D2R-mediated dopamine signaling. DNMT1-associated D2R hypermethylation is responsible for altering the maturation of plasticity at corticostriatal synapses and impairing the behavioral habituation in PRS mice.
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Affiliation(s)
- Yingchun Li
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China
| | - Jing Rong
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China
| | - Haiquan Zhong
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China
| | - Min Liang
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China
| | - Chunting Zhu
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China
| | - Fei Chang
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China
| | - Rong Zhou
- Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, 211166, Jiangsu Province, China.
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Rushmore RJ, McGaughy JA, Amaral AC, Mokler DJ, Morgane PJ, Galler JR, Rosene DL. The neural basis of attentional alterations in prenatally protein malnourished rats. Cereb Cortex 2021; 31:497-512. [PMID: 33099611 PMCID: PMC7947171 DOI: 10.1093/cercor/bhaa239] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 07/29/2020] [Accepted: 08/01/2020] [Indexed: 11/13/2022] Open
Abstract
Protein malnutrition during gestation alters brain development and produces specific behavioral and cognitive changes that persist into adulthood and increase the risks of neuropsychiatric disorders. Given evidence for the role of the prefrontal cortex in such diseases, it is significant that studies in humans and animal models have shown that prenatal protein malnutrition specifically affects functions associated with prefrontal cortex. However, the neural basis underlying these changes is unclear. In the current study, prenatally malnourished and control rats performed a sustained attention task with an unpredictable distractor, a task that depends on intact prefrontal cortical function. Radiolabeled 2-deoxyglucose was used to measure neural and brain network activity during the task. Results confirmed that adult prenatally malnourished rats were more distractible than controls and exhibited lower functional activity in prefrontal cortices. Thus, prefrontal activity was a predictor of task performance in controls but not prenatally malnourished animals. Instead, prenatally malnourished animals relied on different brain networks involving limbic structures such as the hippocampus. These results provide evidence that protein reduction during brain development has more wide-reaching effects on brain networks than previously appreciated, resulting in the formation of brain networks that may reflect compensatory responses in prenatally malnourished brains.
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Affiliation(s)
- R J Rushmore
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston MA
- Psychiatry Neuroimaging Laboratory, Department of Psychiatry, Brigham and Women's Hospital, Boston, MA
- Department of Psychiatry, Harvard Medical School, Boston, MA
| | - J A McGaughy
- Department of Psychology, University of New Hampshire, Durham, NH
| | - A C Amaral
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston MA
| | - D J Mokler
- Department of Biomedical Sciences, University of New England, Biddeford ME
| | - P J Morgane
- Department of Biomedical Sciences, University of New England, Biddeford ME
| | - J R Galler
- Department of Psychiatry, Harvard Medical School, Boston, MA
- Division of Pediatric Gastroenterology and Nutrition, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital for Children, Boston, MA, USA
| | - D L Rosene
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston MA
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Toyoda H, Katagiri A, Kato T, Sato H. Intranasal Administration of Rotenone Reduces GABAergic Inhibition in the Mouse Insular Cortex Leading to Impairment of LTD and Conditioned Taste Aversion Memory. Int J Mol Sci 2020; 22:ijms22010259. [PMID: 33383859 PMCID: PMC7795793 DOI: 10.3390/ijms22010259] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/18/2020] [Accepted: 12/27/2020] [Indexed: 12/21/2022] Open
Abstract
The pesticide rotenone inhibits mitochondrial complex I and is thought to cause neurological disorders such as Parkinson’s disease and cognitive disorders. However, little is known about the effects of rotenone on conditioned taste aversion memory. In the present study, we investigated whether intranasal administration of rotenone affects conditioned taste aversion memory in mice. We also examined how the intranasal administration of rotenone modulates synaptic transmission and plasticity in layer V pyramidal neurons of the mouse insular cortex that is critical for conditioned taste aversion memory. We found that the intranasal administration of rotenone impaired conditioned taste aversion memory to bitter taste. Regarding its cellular mechanisms, long-term depression (LTD) but not long-term potentiation (LTP) was impaired in rotenone-treated mice. Furthermore, spontaneous inhibitory synaptic currents and tonic GABA currents were decreased in layer V pyramidal neurons of rotenone-treated mice compared to the control mice. The impaired LTD observed in pyramidal neurons of rotenone-treated mice was restored by a GABAA receptor agonist muscimol. These results suggest that intranasal administration of rotenone decreases GABAergic synaptic transmission in layer V pyramidal neurons of the mouse insular cortex, the result of which leads to impairment of LTD and conditioned taste aversion memory.
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Song J, Xia XY, Gao T, Yuan CM, Lu XT, Wang LP, Zhang HF. Palmitoylation of AMPA Receptors is Involved in the Inhibition of Hippocampal Long-term Potentiation by Aluminum Exposure in Rats. Biomed Environ Sci 2020; 33:959-963. [PMID: 33472739 DOI: 10.3967/bes2020.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 07/22/2020] [Indexed: 06/12/2023]
Affiliation(s)
- Jing Song
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
| | - Xin Yu Xia
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
| | - Ting Gao
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
| | - Chun Man Yuan
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
| | - Xiao Ting Lu
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
| | - Lin Ping Wang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
| | - Hui Fang Zhang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, Shanxi, China
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Borkowski LF, Nichols NL. Differential mechanisms are required for phrenic long-term facilitation over the course of motor neuron loss following CTB-SAP intrapleural injections. Exp Neurol 2020; 334:113460. [PMID: 32916172 PMCID: PMC10823911 DOI: 10.1016/j.expneurol.2020.113460] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/28/2020] [Accepted: 09/01/2020] [Indexed: 01/25/2023]
Abstract
Selective elimination of respiratory motor neurons using intrapleural injections of cholera toxin B fragment conjugated to saporin (CTB-SAP) mimics motor neuron death and respiratory deficits observed in rat models of neuromuscular diseases. This CTB-SAP model allows us to study the impact of motor neuron death on the output of surviving phrenic motor neurons. After 7(d) days of CTB-SAP, phrenic long-term facilitation (pLTF, a form of respiratory plasticity) is enhanced, but returns towards control levels at 28d. However, the mechanism responsible for this difference in magnitude of pLTF is unknown. In naïve rats, pLTF predominately requires 5-HT2 receptors, the new synthesis of BDNF, and MEK/ERK signaling; however, pLTF can alternatively be induced via A2A receptors, the new synthesis of TrkB, and PI3K/Akt signaling. Since A2A receptor-dependent pLTF is enhanced in naïve rats, we suggest that 7d CTB-SAP treated rats utilize the alternative mechanism for pLTF. Here, we tested the hypothesis that pLTF following CTB-SAP is: 1) TrkB and PI3K/Akt, not BDNF and MEK/ERK, dependent at 7d; and 2) BDNF and MEK/ERK, not TrkB and PI3K/Akt, dependent at 28d. Adult Sprague Dawley male rats were anesthetized, paralyzed, ventilated, and were exposed to acute intermittent hypoxia (AIH; 3, 5 min bouts of 10.5% O2) following bilateral, intrapleural injections at 7d and 28d of: 1) CTB-SAP (25 μg), or 2) un-conjugated CTB and SAP (control). Intrathecal C4 delivery included either: 1) small interfering RNA that targeted BDNF or TrkB mRNA; 2) UO126 (MEK/ERK inhibitor); or 3) PI828 (PI3K/Akt inhibitor). Our data suggest that pLTF in 7d CTB-SAP treated rats is elicited primarily through TrkB and PI3K/Akt-dependent mechanisms, whereas BDNF and MEK/ERK-dependent mechanisms induce pLTF in 28d CTB-SAP treated rats. This project increases our understanding of respiratory plasticity and its implications for breathing following motor neuron death.
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Affiliation(s)
- Lauren F Borkowski
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, United States of America
| | - Nicole L Nichols
- Department of Biomedical Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, United States of America.
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Docq S, Spoelder M, Wang W, Homberg JR. The Protective and Long-Lasting Effects of Human Milk Oligosaccharides on Cognition in Mammals. Nutrients 2020; 12:nu12113572. [PMID: 33233361 PMCID: PMC7700157 DOI: 10.3390/nu12113572] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/19/2020] [Accepted: 11/19/2020] [Indexed: 12/22/2022] Open
Abstract
Over the last few years, research indicated that Human Milk Oligosaccharides (HMOs) may serve to enhance cognition during development. HMOs hereby provide an exciting avenue in the understanding of the molecular mechanisms that contribute to cognitive development. Therefore, this review aims to summarize the reported observations regarding the effects of HMOs on memory and cognition in rats, mice and piglets. Our main findings illustrate that the administration of fucosylated (single or combined with Lacto-N-neoTetraose (LNnT) and other oligosaccharides) and sialylated HMOs results in marked improvements in spatial memory and an accelerated learning rate in operant tasks. Such beneficial effects of HMOs on cognition already become apparent during infancy, especially when the behavioural tasks are cognitively more demanding. When animals age, its effects become increasingly more apparent in simpler tasks as well. Furthermore, the combination of HMOs with other oligosaccharides yields different effects on memory performance as opposed to single HMO administration. In addition, an enhanced hippocampal long-term potentiation (LTP) response both at a young and at a mature age are reported as well. These results point towards the possibility that HMOs administered either in singular or combination forms have long-lasting, beneficial effects on memory and cognition in mammals.
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Affiliation(s)
- Sylvia Docq
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6525 EN Nijmegen, The Netherlands; (S.D.); (M.S.)
| | - Marcia Spoelder
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6525 EN Nijmegen, The Netherlands; (S.D.); (M.S.)
| | - Wendan Wang
- Inner Mongolia Yili Industrial Group, Co., Ltd., Jinshan road 1, Hohhot 010110, China;
| | - Judith R. Homberg
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6525 EN Nijmegen, The Netherlands; (S.D.); (M.S.)
- Correspondence: ; Tel.: +31-24-3610906
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43
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Avchalumov Y, Trenet W, Piña-Crespo J, Mandyam C. SCH23390 Reduces Methamphetamine Self-Administration and Prevents Methamphetamine-Induced Striatal LTD. Int J Mol Sci 2020; 21:E6491. [PMID: 32899459 PMCID: PMC7554976 DOI: 10.3390/ijms21186491] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/01/2020] [Accepted: 09/02/2020] [Indexed: 12/21/2022] Open
Abstract
Extended-access methamphetamine self-administration results in unregulated intake of the drug; however, the role of dorsal striatal dopamine D1-like receptors (D1Rs) in the reinforcing properties of methamphetamine under extended-access conditions is unclear. Acute (ex vivo) and chronic (in vivo) methamphetamine exposure induces neuroplastic changes in the dorsal striatum, a critical region implicated in instrumental learning. For example, methamphetamine exposure alters high-frequency stimulation (HFS)-induced long-term depression in the dorsal striatum; however, the effect of methamphetamine on HFS-induced long-term potentiation (LTP) in the dorsal striatum is unknown. In the current study, dorsal striatal infusion of SCH23390, a D1R antagonist, prior to extended-access methamphetamine self-administration reduced methamphetamine addiction-like behavior. Reduced behavior was associated with reduced expression of PSD-95 in the dorsal striatum. Electrophysiological findings demonstrate that superfusion of methamphetamine reduced basal synaptic transmission and HFS-induced LTP in dorsal striatal slices, and SCH23390 prevented this effect. These results suggest that alterations in synaptic transmission and synaptic plasticity induced by acute methamphetamine via D1Rs could assist with methamphetamine-induced modification of corticostriatal circuits underlying the learning of goal-directed instrumental actions and formation of habits, mediating escalation of methamphetamine self-administration and methamphetamine addiction-like behavior.
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Affiliation(s)
- Yosef Avchalumov
- VA San Diego Healthcare System, San Diego, CA 92161, USA; (Y.A.); (W.T.)
| | - Wulfran Trenet
- VA San Diego Healthcare System, San Diego, CA 92161, USA; (Y.A.); (W.T.)
| | - Juan Piña-Crespo
- Department of Molecular Medicine, Scripps Research, La Jolla, CA 92037, USA;
| | - Chitra Mandyam
- VA San Diego Healthcare System, San Diego, CA 92161, USA; (Y.A.); (W.T.)
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92161, USA
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Sumner RL, McMillan R, Spriggs MJ, Campbell D, Malpas G, Maxwell E, Deng C, Hay J, Ponton R, Sundram F, Muthukumaraswamy SD. Ketamine improves short-term plasticity in depression by enhancing sensitivity to prediction errors. Eur Neuropsychopharmacol 2020; 38:73-85. [PMID: 32763021 DOI: 10.1016/j.euroneuro.2020.07.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 06/02/2020] [Accepted: 07/16/2020] [Indexed: 12/17/2022]
Abstract
Major depressive disorder negatively impacts the sensitivity and adaptability of the brain's predictive coding framework. The current electroencephalography study into the antidepressant properties of ketamine investigated the downstream effects of ketamine on predictive coding and short-term plasticity in thirty patients with depression using the auditory roving mismatch negativity (rMMN). The rMMN paradigm was run 3-4 h after a single 0.44 mg/kg intravenous dose of ketamine or active placebo (remifentanil infused to a target plasma concentration of 1.7 ng/mL) in order to measure the neural effects of ketamine in the period when an improvement in depressive symptoms emerges. Depression symptomatology was measured using the Montgomery-Asberg Depression Rating Scale (MADRS); 70% of patients demonstrated at least a 50% reduction their MADRS global score. Ketamine significantly increased the MMN and P3a event related potentials, directly contrasting literature demonstrating ketamine's acute attenuation of the MMN. This effect was only reliable when all repetitions of the post-deviant tone were used. Dynamic causal modelling showed greater modulation of forward connectivity in response to a deviant tone between right primary auditory cortex and right inferior temporal cortex, which significantly correlated with antidepressant response to ketamine at 24 h. This is consistent with the hypothesis that ketamine increases sensitivity to unexpected sensory input and restores deficits in sensitivity to prediction error that are hypothesised to underlie depression. However, the lack of repetition suppression evident in the MMN evoked data compared to studies of healthy adults suggests that, at least within the short term, ketamine does not improve deficits in adaptive internal model calibration.
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Affiliation(s)
| | | | - Meg J Spriggs
- Centre for Psychedelic Research, Department of Medicine, Imperial College London, UK; Brain Research New Zealand; School of Psychology, University of Auckland, New Zealand
| | - Doug Campbell
- Department of Anaesthesia and Perioperative Medicine, Auckland District Health Board, New Zealand
| | - Gemma Malpas
- Department of Anaesthesia and Perioperative Medicine, Auckland District Health Board, New Zealand
| | - Elizabeth Maxwell
- Department of Anaesthesia and Perioperative Medicine, Auckland District Health Board, New Zealand
| | - Carolyn Deng
- Department of Anaesthesia and Perioperative Medicine, Auckland District Health Board, New Zealand
| | - John Hay
- Department of Anaesthesia and Perioperative Medicine, Auckland District Health Board, New Zealand
| | - Rhys Ponton
- School of Pharmacy, University of Auckland, New Zealand
| | - Frederick Sundram
- Department of Psychological Medicine, University of Auckland, New Zealand
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Lyu Y, Ren XK, Zhang HF, Tian FJ, Mu JB, Zheng JP. Sub-chronic administration of benzo[a]pyrene disrupts hippocampal long-term potentiation via inhibiting CaMK II/PKC/PKA-ERK-CREB signaling in rats. Environ Toxicol 2020; 35:961-970. [PMID: 32255272 DOI: 10.1002/tox.22932] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 03/25/2020] [Accepted: 03/27/2020] [Indexed: 06/11/2023]
Abstract
Benzo[a]pyrene (B[a]P) is recognized as a neurotoxic pollutant to mammals, which could impair learning and memory function. Although there is some evidence to suggest that N-methyl-d-aspartate receptor (NMDAR), a glutamate receptor and ion channel protein in nerve cells, is involved into the B[a]P induced neurotoxicity, the exact molecular mechanisms remain to be elucidated, particularly the effects of B[a]P on the NMDAR downstream signaling transduction pathways. In the present study, we examined the neurotoxicity of sub-chronic administrated B[a]P on male Sprague-Dawley rats. Our data suggested that B[a]P exposure caused significant deficits in learning and memory function and the impairment of hippocampal LTP in rats. Further mechanistic studies indicate that B[a]P-induced learning and memory deficits are associated with the inhibition of NMDAR NR1 subunit transcription and protein phosphorylation. More importantly, the inactivation of CaMK II/PKC/PKA-ERK-CREB signaling pathways in hippocampus was detected at both the 2.5 and 6.25 mg/kg B[a]P-treated groups, indicating that multiple targets in NMDAR and downstream signaling pathways are involved in the B[a]P-induced neurotoxicity.
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Affiliation(s)
- Yi Lyu
- Department of Health Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China
- Department of Biochemistry and Molecular Biology, School of Preclinical Medicine, Shanxi Medical University, Taiyuan, China
| | - Xue-Ke Ren
- Department of Health Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Hui-Fang Zhang
- Department of Health Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Feng-Jie Tian
- Department of Health Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Jian-Bing Mu
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institute of Health, Rockville, Maryland, USA
| | - Jin-Ping Zheng
- Department of Health Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China
- Department of Public Health and Preventive Medicine, Changzhi Medical College, Changzhi, China
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Perim RR, Kubilis PS, Seven YB, Mitchell GS. Hypoxia-induced hypotension elicits adenosine-dependent phrenic long-term facilitation after carotid denervation. Exp Neurol 2020; 333:113429. [PMID: 32735873 DOI: 10.1016/j.expneurol.2020.113429] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/06/2020] [Accepted: 07/25/2020] [Indexed: 11/19/2022]
Abstract
Moderate acute intermittent hypoxia (AIH) elicits a persistent, serotonin-dependent increase in phrenic amplitude, known as phrenic long-term facilitation (pLTF). Although pLTF was originally demonstrated by carotid sinus nerve stimulation, AIH still elicits residual pLTF in carotid denervated (CBX) rats via a distinct, but unknown mechanism. We hypothesized that exaggerated hypoxia-induced hypotension after carotid denervation leads to greater spinal tissue hypoxia and extracellular adenosine accumulation, thereby triggering adenosine 2A receptor (A2A)-dependent pLTF. Phrenic activity, arterial pressure and spinal tissue oxygen pressure were measured in anesthetized CBX rats. Exaggerated hypoxia-induced hypotension after CBX was prevented via intravenous phenylephrine; without the hypotension, spinal tissue hypoxia during AIH was normalized, and residual pLTF was no longer observed. Spinal A2A (MSX-3), but not serotonin 2 receptor (5-HT2) inhibition (ketanserin), abolished residual pLTF in CBX rats. Thus, pLTF regulation may be altered in conditions impairing sympathetic activity and arterial pressure regulation, such as spinal cord injury.
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Affiliation(s)
- Raphael R Perim
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA
| | - Paul S Kubilis
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA
| | - Yasin B Seven
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA
| | - Gordon S Mitchell
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA.
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Srivastava I, Vazquez-Juarez E, Henning L, Gómez-Galán M, Lindskog M. Blocking Astrocytic GABA Restores Synaptic Plasticity in Prefrontal Cortex of Rat Model of Depression. Cells 2020; 9:cells9071705. [PMID: 32708718 PMCID: PMC7408154 DOI: 10.3390/cells9071705] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/06/2020] [Accepted: 07/13/2020] [Indexed: 12/15/2022] Open
Abstract
A decrease in synaptic plasticity and/or a change in excitation/inhibition balance have been suggested as mechanisms underlying major depression disorder. However, given the crucial role of astrocytes in balancing synaptic function, particular attention should be given to the contribution of astrocytes in these mechanisms, especially since previous findings show that astrocytes are affected and exhibit reactive-like features in depression. Moreover, it has been shown that reactive astrocytes increase the synthesis and release of GABA, contributing significantly to tonic GABA inhibition. In this study we found decreased plasticity and increased tonic GABA inhibition in the prelimbic area in acute slices from the medial prefrontal cortex in the Flinders Sensitive Line (FSL) rat model of depression. The tonic inhibition can be reduced by either blocking astrocytic intracellular Ca2+ signaling or by reducing astrocytic GABA through inhibition of the synthesizing enzyme MAO-B with Selegiline. Blocking GABA synthesis also restores the impaired synaptic plasticity in the FSL prefrontal cortex, providing a new antidepressant mechanism of Selegiline.
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Affiliation(s)
- Ipsit Srivastava
- Dep. Neurobiology, Care Sciences and Society, Karolinska Institutet, 171 77 Stockholm, Sweden; (I.S.); (E.V.-J.); (L.H.)
| | - Erika Vazquez-Juarez
- Dep. Neurobiology, Care Sciences and Society, Karolinska Institutet, 171 77 Stockholm, Sweden; (I.S.); (E.V.-J.); (L.H.)
| | - Lukas Henning
- Dep. Neurobiology, Care Sciences and Society, Karolinska Institutet, 171 77 Stockholm, Sweden; (I.S.); (E.V.-J.); (L.H.)
| | - Marta Gómez-Galán
- Dep. Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
- Correspondence: (M.G.-G.); (M.L.)
| | - Maria Lindskog
- Dep. Neurobiology, Care Sciences and Society, Karolinska Institutet, 171 77 Stockholm, Sweden; (I.S.); (E.V.-J.); (L.H.)
- Correspondence: (M.G.-G.); (M.L.)
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Guo KF, Dai M, Liu YM, Zhang JC, Chen YM, Ye H, Li MB, Mao RR, Cao J. Acute Administration of Methyleugenol Impairs Hippocampus-Dependent Contextual Fear Memory and Increases Anxiety-like Behavior in Mice. J Agric Food Chem 2020; 68:7490-7497. [PMID: 32551566 DOI: 10.1021/acs.jafc.0c01863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Methyleugenol (ME) as a natural essential oil in many plant species is widely used in human food and beverage for its fragrance and possible beneficial health effects. Previous chronic or subacute studies in rodents show that ME mainly causes liver toxicity. However, whether and how acute ME affects the central nervous system still remain elusive. Here, we found that ME administrated into the hippocampus impaired the acquisition of hippocampus-dependent contextual fear memory in mice (ME vs control: repeated-measures two-way ANOVA, F(5,70) = 2.937, p < 0.05; Fisher test, p < 0.05, respectively, 53 ± 5.2% vs 73 ± 7.6% during trial 4 and 46.8 ± 6% vs 74.5 ± 9.3% during trial 5). Meanwhile, acute ME impaired hippocampal CA1 long-term potentiation (LTP; ME vs control: independent t-test, p < 0.01, 110.6 ± 1.8% vs 133.3 ± 5.6%) while facilitated long-term depression (LTD; p < 0.01, 75.7 ± 3.4% vs 88.6 ± 1.7%) in mice brain slices and inducing a decrease in learning-dependent phosphorylation of Ser831 (ME vs control: independent t-test, p < 0.001, 0.87 ± 0.03 vs 1.23 ± 0.03) and Ser845 (p < 0.01, 0.42 ± 0.07 vs 0.97 ± 0.14) sites of excitatory glutamate AMPA receptor subunit 1 (GluA1) in the hippocampus, which may be the underlying mechanisms of impairment of hippocampus-dependent learning. In addition, intrahippocampal infusion of ME also increased anxiety-like behaviors in mice. These results suggested that acute ME impaired the hippocampus function at behavioral, cellular, and molecular levels, indicating the potential risks of ME on the central nervous system.
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Affiliation(s)
- Kai-Fei Guo
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology and School of Ecology and Environmental Science, Yunnan University, Kunming, Yunnan 650504, China
- School of Agriculture, Yunnan University, Kunming, Yunnan 650504, China
| | - Man Dai
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology and School of Ecology and Environmental Science, Yunnan University, Kunming, Yunnan 650504, China
| | - Yi-Miao Liu
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology and School of Ecology and Environmental Science, Yunnan University, Kunming, Yunnan 650504, China
| | - Ji-Chuan Zhang
- Department of Basic Medicine, Medical School, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Yan-Mei Chen
- Department of Basic Medicine, Medical School, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Hui Ye
- School of Agriculture, Yunnan University, Kunming, Yunnan 650504, China
| | - Man-Bi Li
- Yunnan Institute of Environmental Sciences, Kunming, Yunnan 650034, China
| | - Rong-Rong Mao
- Department of Pathology and Pathophysiology, School of Basic Medical Science, Kunming Medical University, Kunming, Yunnan 650500, China
| | - Jun Cao
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology and School of Ecology and Environmental Science, Yunnan University, Kunming, Yunnan 650504, China
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49
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Beyer MMS, Lonnemann N, Remus A, Latz E, Heneka MT, Korte M. Enduring Changes in Neuronal Function upon Systemic Inflammation Are NLRP3 Inflammasome Dependent. J Neurosci 2020; 40:5480-5494. [PMID: 32499379 PMCID: PMC7343321 DOI: 10.1523/jneurosci.0200-20.2020] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 05/25/2020] [Accepted: 05/28/2020] [Indexed: 01/21/2023] Open
Abstract
Neuroinflammation can be caused by various insults to the brain and represents an important pathologic hallmark of neurodegenerative diseases including Alzheimer's disease (AD). Infection-triggered acute systemic inflammation is able to induce neuroinflammation and may negatively affect neuronal morphology, synaptic plasticity, and cognitive function. In contrast to acute effects, persisting consequences for the brain on systemic immune stimulation remain largely unexplored. Here, we report an age-dependent vulnerability of wild-type (WT) mice of either sex toward a systemic immune stimulation by Salmonella typhimurium lipopolysaccharide (LPS). Decreased neuronal complexity three months after peripheral immune stimulation is accompanied by impairment in long-term potentiation (LTP) and spatial learning. Aged APP/PS1 mice reveal an increased sensitivity also to LPS of Escherichia coli, which had no effect in WT mice. We further report that these effects are mediated by NOD-like receptor family, pyrin domain containing 3 (NLRP3) inflammasome activation, since the genetic ablation and pharmacological inhibition using the NLRP3 inhibitor MCC950 rescue the morphological and electrophysiological phenotype.SIGNIFICANCE STATEMENT Acute peripheral immune stimulation has been shown to have both positive and negative effects on Aβ deposition. Improvements or worsening may be possible in acute inflammation. However, there is still no evidence of effects longer than a month after stimulation. The data are pointing to an important role of the NOD-like receptor family, pyrin domain containing 3 (NLRP3) inflammasome for mediating the long-term consequences of systemic immune stimulation, which in addition turns out to be age dependent.
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Affiliation(s)
- Marianna M S Beyer
- Division of Cellular Neurobiology, Zoological Institute, Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Research Group Neuroinflammation and Neurodegeneration, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
| | - Niklas Lonnemann
- Division of Cellular Neurobiology, Zoological Institute, Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Research Group Neuroinflammation and Neurodegeneration, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
| | - Anita Remus
- Division of Cellular Neurobiology, Zoological Institute, Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Research Group Neuroinflammation and Neurodegeneration, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
| | - Eicke Latz
- German Center for Neurodegenerative Disease (DZNE), 53127 Bonn, Germany
- Institute of Innate Immunity, University of Bonn, Bonn 53127, Germany
| | - Michael T Heneka
- Institute of Innate Immunity, University of Bonn, Bonn 53127, Germany
- Department of Neurodegenerative Disorders and Gerontopsychiatry, University of Bonn, Bonn 53127, Germany
| | - Martin Korte
- Division of Cellular Neurobiology, Zoological Institute, Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Research Group Neuroinflammation and Neurodegeneration, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
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50
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Abstract
Chronic pain is a major health problem and the effective treatment for chronic pain is still lacking. The recent crisis created by the overuse of opioids for pain treatment has clearly shown the need for non-addictive novel pain medicine. Conventional pain medicines usually inhibit peripheral nociceptive transmission and reduce central transmission, especially pain-related excitatory transmission. For example, both opioids and gabapentin produce analgesic effects by inhibiting the release of excitatory transmitters and reducing neuronal excitability. Here, we will review recent studies of central synaptic plasticity contributing to central sensitization in chronic pain. Neuronal selective adenylyl cyclase subtype 1 (AC1) is proposed to be a key intracellular protein that causes both presynaptic and postsynaptic forms of long-term potentiation (LTP). Inhibiting the activity of AC1 by selective inhibitor NB001 blocks behavioral sensitization and injury-related anxiety in animal models of chronic pain. We propose that inhibiting injury-related LTPs will provide new mechanisms for designing novel medicines for the treatment of chronic pain and its related emotional disorders.
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Affiliation(s)
- Xu-Hui Li
- Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong China
- Center for Neuron and Disease, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710049 Shaanxi China
- Department of Physiology, Faculty of Medicine, University of Toronto, Medical Science Building, 1 King’s College Circle, Toronto, Ontario M5S 1A8 Canada
| | - Qi-Yu Chen
- Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong China
- Center for Neuron and Disease, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710049 Shaanxi China
| | - Min Zhuo
- Institute of Brain Research, Qingdao International Academician Park, Qingdao, Shandong China
- Center for Neuron and Disease, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710049 Shaanxi China
- Department of Physiology, Faculty of Medicine, University of Toronto, Medical Science Building, 1 King’s College Circle, Toronto, Ontario M5S 1A8 Canada
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