1
|
Otsuka H, Sasaki-Hamada S, Ishibashi H, Oka JI. Hippocampal acetylcholine receptor activation-dependent long-term depression in streptozotocin-induced diabetic rats. Neurosci Lett 2024; 822:137650. [PMID: 38253285 DOI: 10.1016/j.neulet.2024.137650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/19/2024] [Accepted: 01/19/2024] [Indexed: 01/24/2024]
Abstract
Cholinergic innervation of the hippocampus correlates with memory formation. In a well-established animal model of type 1 diabetes mellitus, obtained by injecting young adult rats with streptozotocin (STZ), reductions have been reported in the expression of acetylcholine receptors and choline acetyltransferase. In this study, we showed that long-term synaptic depression (LTD) induced by carbachol (CCh), a nonselective cholinergic receptor agonist, at Schaffer collateral-CA1 synapses in hippocampal slices was significantly weaker in streptozotocin-induced diabetic rats (STZ rats) than in age-matched control rats. No significant change was observed in the paired-pulse ratio between before and 80 min after the application of CCh in control and STZ rats. Moreover, CCh-induced LTD in control and STZ rats was not affected by an NMDA receptor antagonist. Although the application of CCh down-regulated the surface expression of GluA2 in the hippocampus of control rats, but not STZ rats. Therefore, the present results suggest that acetylcholine receptor-mediated LTD in STZ rats requires the internalization of AMPA receptors on the postsynaptic surface and their intracellular effects in the hippocampus.
Collapse
Affiliation(s)
- Hayuma Otsuka
- Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan
| | - Sachie Sasaki-Hamada
- Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; Department of Physiology, School of Allied Health Sciences, Kitasato University, Kanagawa 252-0373, Japan.
| | - Hitoshi Ishibashi
- Department of Physiology, School of Allied Health Sciences, Kitasato University, Kanagawa 252-0373, Japan
| | - Jun-Ichiro Oka
- Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan.
| |
Collapse
|
2
|
Cyclin Y regulates spatial learning and memory flexibility through distinct control of the actin pathway. Mol Psychiatry 2023; 28:1351-1364. [PMID: 36434054 PMCID: PMC10005959 DOI: 10.1038/s41380-022-01877-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 11/02/2022] [Accepted: 11/08/2022] [Indexed: 11/27/2022]
Abstract
Spatial learning and memory flexibility are known to require long-term potentiation (LTP) and long-term depression (LTD), respectively, on a cellular basis. We previously showed that cyclin Y (CCNY), a synapse-remodeling cyclin, is a novel actin-binding protein and an inhibitory regulator of functional and structural LTP in vitro. In this study, we report that Ccny knockout (KO) mice exhibit enhanced LTP and weak LTD at Schaffer collateral-CA1 synapses in the hippocampus. In accordance with enhanced LTP, Ccny KO mice showed improved spatial learning and memory. However, although previous studies reported that normal LTD is necessary for memory flexibility, Ccny KO mice intriguingly showed improved memory flexibility, suggesting that weak LTD could exert memory flexibility when combined with enhanced LTP. At the molecular level, CCNY modulated spatial learning and memory flexibility by distinctively affecting the cofilin-actin signaling pathway in the hippocampus. Specifically, CCNY inhibited cofilin activation by original learning, but reversed such inhibition by reversal learning. Furthermore, viral-mediated overexpression of a phosphomimetic cofilin-S3E in hippocampal CA1 regions enhanced LTP, weakened LTD, and improved spatial learning and memory flexibility, thus mirroring the phenotype of Ccny KO mice. In contrast, the overexpression of a non-phosphorylatable cofilin-S3A in hippocampal CA1 regions of Ccny KO mice reversed the synaptic plasticity, spatial learning, and memory flexibility phenotypes observed in Ccny KO mice. Altogether, our findings demonstrate that LTP and LTD cooperatively regulate memory flexibility. Moreover, CCNY suppresses LTP while facilitating LTD in the hippocampus and negatively regulates spatial learning and memory flexibility through the control of cofilin-actin signaling, proposing CCNY as a learning regulator modulating both memorizing and forgetting processes.
Collapse
|
3
|
Li JB, Hu XY, Chen MW, Xiong CH, Zhao N, Ge YH, Wang H, Gao XL, Xu NJ, Zhao LX, Yu ZH, Chen HZ, Qiu Y. p85S6K sustains synaptic GluA1 to ameliorate cognitive deficits in Alzheimer's disease. Transl Neurodegener 2023; 12:1. [PMID: 36624510 PMCID: PMC9827685 DOI: 10.1186/s40035-022-00334-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 12/26/2022] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Ribosomal protein S6 kinase 1 (S6K1) is a serine-threonine kinase that has two main isoforms: p70S6K (70-kDa isoform) and p85S6K (85-kDa isoform). p70S6K, with its upstream mammalian target of rapamycin (mTOR), has been shown to be involved in learning and memory and participate in the pathophysiology of Alzheimer's disease (AD). However, the function of p85S6K has long been neglected due to its high similarity to p70S6k. The role of p85S6K in learning and memory is still largely unknown. METHODS We fractionated the postsynaptic densities to illustrate the differential distribution of p85S6K and p70S6K. Coimmunoprecipitation was performed to unveil interactions between p85S6K and the GluA1 subunit of AMPA receptor. The roles of p85S6K in synaptic targeting of GluA1 and learning and memory were evaluated by specific knockdown or overexpression of p85S6K followed by a broad range of methodologies including immunofluorescence, Western blot, in situ proximity ligation assay, morphological staining and behavioral examination. Further, the expression level of p85S6K was measured in brains from AD patients and AD model mice. RESULTS p85S6K, but not p70S6K, was enriched in the postsynaptic densities. Moreover, knockdown of p85S6K resulted in defective spatial and recognition memory. In addition, p85S6K could interact with the GluA1 subunit of AMPA receptor through synapse-associated protein 97 and A-kinase anchoring protein 79/150. Mechanistic studies demonstrated that p85S6K could directly phosphorylate GluA1 at Ser845 and increase the amount of GluA1 in synapses, thus sustaining synaptic function and spine densities. Moreover, p85S6K was found to be specifically decreased in the synaptosomal compartment in the brains of AD patients and AD mice. Overexpression of p85S6K ameliorated the synaptic deficits and cognitive impairment in transgenic AD model mice. CONCLUSIONS These results strongly imply a significant role for p85S6K in maintaining synaptic and cognitive function by interacting with GluA1. The findings provide an insight into the rational targeting of p85S6K as a therapeutic potential for AD.
Collapse
Affiliation(s)
- Jia-Bing Li
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Xiao-Yu Hu
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Mu-Wen Chen
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Cai-Hong Xiong
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Na Zhao
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Yan-Hui Ge
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Hao Wang
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Xiao-Ling Gao
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Nan-Jie Xu
- grid.16821.3c0000 0004 0368 8293Collaborative Innovation Center for Brain Science, Department of Anatomy and Physiology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Lan-Xue Zhao
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Zhi-Hua Yu
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Hong-Zhuan Chen
- Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China. .,Institute of Interdisciplinary Integrative Biomedical Research, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 201210, China.
| | - Yu Qiu
- Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.
| |
Collapse
|
4
|
Scott DN, Frank MJ. Adaptive control of synaptic plasticity integrates micro- and macroscopic network function. Neuropsychopharmacology 2023; 48:121-144. [PMID: 36038780 PMCID: PMC9700774 DOI: 10.1038/s41386-022-01374-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 06/23/2022] [Accepted: 06/24/2022] [Indexed: 11/09/2022]
Abstract
Synaptic plasticity configures interactions between neurons and is therefore likely to be a primary driver of behavioral learning and development. How this microscopic-macroscopic interaction occurs is poorly understood, as researchers frequently examine models within particular ranges of abstraction and scale. Computational neuroscience and machine learning models offer theoretically powerful analyses of plasticity in neural networks, but results are often siloed and only coarsely linked to biology. In this review, we examine connections between these areas, asking how network computations change as a function of diverse features of plasticity and vice versa. We review how plasticity can be controlled at synapses by calcium dynamics and neuromodulatory signals, the manifestation of these changes in networks, and their impacts in specialized circuits. We conclude that metaplasticity-defined broadly as the adaptive control of plasticity-forges connections across scales by governing what groups of synapses can and can't learn about, when, and to what ends. The metaplasticity we discuss acts by co-opting Hebbian mechanisms, shifting network properties, and routing activity within and across brain systems. Asking how these operations can go awry should also be useful for understanding pathology, which we address in the context of autism, schizophrenia and Parkinson's disease.
Collapse
Affiliation(s)
- Daniel N Scott
- Cognitive Linguistic, and Psychological Sciences, Brown University, Providence, RI, USA.
- Carney Institute for Brain Science, Brown University, Providence, RI, USA.
| | - Michael J Frank
- Cognitive Linguistic, and Psychological Sciences, Brown University, Providence, RI, USA.
- Carney Institute for Brain Science, Brown University, Providence, RI, USA.
| |
Collapse
|
5
|
Chandramouleeshwaran S, Ghazala Z, Nobrega JN, Raymond R, Gambino S, Pollock BG, Rajji TK. Cell-based serum anticholinergic activity assay and working memory in cognitively healthy older adults before and after scopolamine: An exploratory study. J Psychopharmacol 2022; 36:1070-1076. [PMID: 36112867 DOI: 10.1177/02698811221122019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND A new cell-based serum anticholinergic activity (cSAA) assay that measures anticholinergic activity specifically at muscarinic M1 receptors and eliminates many of the drawbacks of the existing assay was developed by our team. AIMS We aimed to study the relationship between changes in working memory and executive function with changes in cSAA using the new assay in cognitively healthy older adults. METHODS Cognitively healthy participants aged 50 years and above, received a single dose of 0.4 mg of intravenous scopolamine. Cognition and cSAA levels were measured before and 30 min after receiving scopolamine. Cognition was measured using the Cambridge Neuropsychological Test Automated Battery. RESULTS Ten participants were recruited, and nine (mean age = 69.8, SD = 9.5, range 59-86 years) completed the study. Following scopolamine, participants experienced an increase in cSAA (cSAA pre = 0.90 ± 0.97 vs cSAA post = 12.0 ± 3.70 pmol/L; t-test (df = (8) = -9.5, p < 0.001). In addition, there was an association between change in cSAA and changes in working memory (Spearman's ρ = 0.68, p = 0.042) and executive function (Spearman's ρ = 0.72, p = 0.027). CONCLUSIONS In our sample of cognitively healthy older adults, the new cSAA assay was able to quantify the scopolamine induced increase in anticholinergic load which correlated significantly with the observed decline in working memory and executive function.
Collapse
Affiliation(s)
- Susmita Chandramouleeshwaran
- Centre for Addiction and Mental Health, Toronto, ON, Canada.,University of Toronto, Toronto, ON, Canada.,University of Ottawa, Ottawa, ON, Canada
| | - Zaid Ghazala
- Centre for Addiction and Mental Health, Toronto, ON, Canada.,University of Toronto, Toronto, ON, Canada
| | - José N Nobrega
- Centre for Addiction and Mental Health, Toronto, ON, Canada.,University of Toronto, Toronto, ON, Canada
| | - Roger Raymond
- Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Sara Gambino
- Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Bruce G Pollock
- Centre for Addiction and Mental Health, Toronto, ON, Canada.,University of Toronto, Toronto, ON, Canada
| | - Tarek K Rajji
- Centre for Addiction and Mental Health, Toronto, ON, Canada.,University of Toronto, Toronto, ON, Canada
| |
Collapse
|
6
|
Kumari A, Rahaman A, Zeng XA, Farooq MA, Huang Y, Yao R, Ali M, Ishrat R, Ali R. Temporal Cortex Microarray Analysis Revealed Impaired Ribosomal Biogenesis and Hyperactivity of the Glutamatergic System: An Early Signature of Asymptomatic Alzheimer's Disease. Front Neurosci 2022; 16:966877. [PMID: 35958988 PMCID: PMC9359077 DOI: 10.3389/fnins.2022.966877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 06/23/2022] [Indexed: 11/21/2022] Open
Abstract
Pathogenic aging is regarded as asymptomatic AD when there is no cognitive deficit except for neuropathology consistent with Alzheimer's disease. These individuals are highly susceptible to developing AD. Braak and Braak's theory specific to tau pathology illustrates that the brain's temporal cortex region is an initiation site for early AD progression. So, the hub gene analysis of this region may reveal early altered biological cascades that may be helpful to alleviate AD in an early stage. Meanwhile, cognitive processing also drags its attention because cognitive impairment is the ultimate result of AD. Therefore, this study aimed to explore changes in gene expression of aged control, asymptomatic AD (AsymAD), and symptomatic AD (symAD) in the temporal cortex region. We used microarray data sets to identify differentially expressed genes (DEGs) with the help of the R programming interface. Further, we constructed the protein-protein interaction (PPI) network by performing the STRING plugin in Cytoscape and determined the hub genes via the CytoHubba plugin. Furthermore, we conducted Gene Ontology (GO) enrichment analysis via Bioconductor's cluster profile package. Resultant, the AsymAD transcriptome revealed the early-stage changes of glutamatergic hyperexcitability. Whereas the connectivity of major hub genes in this network indicates a shift from initially reduced rRNA biosynthesis in the AsymAD group to impaired protein synthesis in the symAD group. Both share the phenomenon of breaking tight junctions and others. In conclusion, this study offers new understandings of the early biological vicissitudes that occur in the brain before the manifestation of symAD and gives new promising therapeutic targets for early AD intervention.
Collapse
Affiliation(s)
- Ankita Kumari
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Key Laboratory of Food Intelligent Manufacturing, Foshan University, Foshan, China
- Overseas Expertise Introduction Centre for Discipline Innovation of Food Nutrition and Human Health (111 Centre), Guangzhou, China
| | - Abdul Rahaman
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Key Laboratory of Food Intelligent Manufacturing, Foshan University, Foshan, China
- Overseas Expertise Introduction Centre for Discipline Innovation of Food Nutrition and Human Health (111 Centre), Guangzhou, China
- Abdul Rahaman
| | - Xin-An Zeng
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Key Laboratory of Food Intelligent Manufacturing, Foshan University, Foshan, China
- Overseas Expertise Introduction Centre for Discipline Innovation of Food Nutrition and Human Health (111 Centre), Guangzhou, China
- *Correspondence: Xin-An Zeng
| | - Muhammad Adil Farooq
- Institute of Food Science and Technology, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan
| | - Yanyan Huang
- Guangdong Key Laboratory of Food Intelligent Manufacturing, Foshan University, Foshan, China
| | - Runyu Yao
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Overseas Expertise Introduction Centre for Discipline Innovation of Food Nutrition and Human Health (111 Centre), Guangzhou, China
| | - Murtaza Ali
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Key Laboratory of Food Intelligent Manufacturing, Foshan University, Foshan, China
- Overseas Expertise Introduction Centre for Discipline Innovation of Food Nutrition and Human Health (111 Centre), Guangzhou, China
| | - Romana Ishrat
- Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
- Romana Ishrat
| | - Rafat Ali
- Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| |
Collapse
|
7
|
Chandramouleeshwaran S, Ahsan N, Raymond R, Nobrega JN, Wang W, Fischer CE, Flint AJ, Herrmann N, Kumar S, Lanctôt K, Mah L, Mulsant BH, Pollock BG, Rajji TK. Relationships Between a New Cultured Cell-Based Serum Anticholinergic Activity Assay and Anticholinergic Burden Scales or Cognitive Performance in Older Adults. Am J Geriatr Psychiatry 2021; 29:1239-1252. [PMID: 33846084 DOI: 10.1016/j.jagp.2021.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/10/2021] [Accepted: 03/12/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES Anticholinergic burden has been associated with deleterious effects on cognition particularly in those with an underlying brain disorder. We developed a new assay based on cultured cells to measure serum anticholinergic activity (cSAA). We report on its relationships with established anticholinergic burden rating scales and cognitive assessments in older patients with mild cognitive impairment (MCI) or major depressive disorder (MDD) in remission or both. DESIGN The study was cross sectional in nature. SETTING This was a five-centre study conducted in Toronto, Canada. PARTICIPANTS Serum samples were collected and cSAA levels were measured in 311 participants aged 60 years or older (154 with MCI, 57 with MDD, and 100 with MCI + MDD). MEASUREMENTS The cSAA assay uses radio-ligand binding to cultured cells stably expressing the muscarinic M1 receptors, with an added procedure to remove potential confounds associated with serum proteins. Lists of medications were used to calculate Anticholinergic Burden and Anticholinergic Drug Scale total scores. Participants also completed a comprehensive cognitive battery. RESULTS Higher cSAA levels were associated with higher anticholinergic burden and anticholinergic drug scale scores, and also with lower performance on executive function tests, after adjusting for age, gender, education, and diagnosis. CONCLUSIONS These results support the use of the cSAA assay as a laboratory measure of anticholinergic burden.
Collapse
Affiliation(s)
- Susmita Chandramouleeshwaran
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada
| | - Naba Ahsan
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada
| | - Roger Raymond
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada
| | - Jose N Nobrega
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada
| | - Wei Wang
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada
| | - Corinne E Fischer
- Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Keenan Research Centre for Biomedical Science, St. Michael's Hospital (CEF), Toronto, Canada; Toronto Dementia Research Alliance (CEF, SK, KL, BHM, BGP, TKR), University of Toronto, Canada
| | - Alastair J Flint
- Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Centre for Mental Health (AJF), University Health Network, Toronto, Canada
| | - Nathan Herrmann
- Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Sunnybrook Health Sciences Centre, (NH, KL) Toronto, Canada
| | - Sanjeev Kumar
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Toronto Dementia Research Alliance (CEF, SK, KL, BHM, BGP, TKR), University of Toronto, Canada
| | - Krista Lanctôt
- Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Toronto Dementia Research Alliance (CEF, SK, KL, BHM, BGP, TKR), University of Toronto, Canada; Sunnybrook Health Sciences Centre, (NH, KL) Toronto, Canada
| | - Linda Mah
- Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Rotman Research Institute, Baycrest Health Sciences Centre, (LM) Toronto, Canada
| | - Benoit H Mulsant
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Toronto Dementia Research Alliance (CEF, SK, KL, BHM, BGP, TKR), University of Toronto, Canada
| | - Bruce G Pollock
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Toronto Dementia Research Alliance (CEF, SK, KL, BHM, BGP, TKR), University of Toronto, Canada
| | - Tarek K Rajji
- Centre for Addiction and Mental Health (SC, NA, RR, JNN, WW, SK, BHM, BGP, TKR), Toronto, Canada; Department of Psychiatry (JNB, WW, CEF, AJF, NH, SK, KL, LM, BHM, BGP, TKR), University of Toronto, Toronto, Canada; Toronto Dementia Research Alliance (CEF, SK, KL, BHM, BGP, TKR), University of Toronto, Canada.
| |
Collapse
|
8
|
Grafe EL, Fontaine CJ, Thomas JD, Christie BR. Effects of prenatal ethanol exposure on choline-induced long-term depression in the hippocampus. J Neurophysiol 2021; 126:1622-1634. [PMID: 34495785 DOI: 10.1152/jn.00136.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Choline is an essential nutrient under evaluation as a cognitive enhancing treatment for fetal alcohol spectrum disorders (FASD) in clinical trials. As a result, there is increased pressure to identify therapeutic mechanism(s) of action. Choline is not only a precursor for several essential cell membrane components and signaling molecules but also has the potential to directly affect synaptic mechanisms that are believed important for cognitive processes. In the current work, we study how the direct application of choline can affect synaptic transmission in the dentate gyrus (DG) of hippocampal slices obtained from adolescent (postnatal days 21-28) Sprague-Dawley rats (Rattus norvegicus). The acute administration of choline chloride (2 mM) reliably induced a long-term depression (LTD) of field excitatory postsynaptic potentials (fEPSPs) in the DG in vitro. The depression required the involvement of M1 receptors, and the magnitude of the effect was similar in slices obtained from male and female animals. To further study the impact of choline in an animal model of FASD, we examined offspring from dams fed an ethanol-containing diet (35.5% ethanol-derived calories) throughout gestation. In slices from the adolescent animals that experienced prenatal ethanol exposure (PNEE), we found that the choline induced an LTD that uniquely involved the activation of N-methyl-d-aspartate (NMDA) and M1 receptors. This study provides a novel insight into how choline can modulate hippocampal transmission at the level of the synapse and that it can have unique effects following PNEE.NEW & NOTEWORTHY Choline supplementation is a nutraceutical therapy with significant potential for a variety of developmental disorders; however, the mechanisms involved in its therapeutic effects remain poorly understood. Our research shows that choline directly impacts synaptic communication in the brain, inducing a long-term depression of synaptic efficacy in brain slices. The depression is equivalent in male and female animals, involves M1 receptors in control animals, but uniquely involves NMDA receptors in a model of FASD.
Collapse
Affiliation(s)
- Erin L Grafe
- Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada
| | - Christine J Fontaine
- Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada
| | - Jennifer D Thomas
- Department of Psychology, San Diego State University, San Diego, California
| | - Brian R Christie
- Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada.,Island Medical Program, Department of Cellular and Physiological Sciences, University of British Columbia, Victoria, British Columbia, Canada
| |
Collapse
|
9
|
Chronic administration of ketamine induces cognitive deterioration by restraining synaptic signaling. Mol Psychiatry 2021; 26:4702-4718. [PMID: 32488127 DOI: 10.1038/s41380-020-0793-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 05/06/2020] [Accepted: 05/18/2020] [Indexed: 12/20/2022]
Abstract
The discovery of the rapid antidepressant effects of ketamine has arguably been the most important advance in depression treatment. Recently, it was reported that repeated long-term ketamine administration is effective in preventing relapse of depression, which may broaden the clinical use of ketamine. However, long-term treatment with ketamine produces cognitive impairments, and the underlying molecular mechanisms for these impairments are largely unknown. Here, we found that chronic in vivo exposure to ketamine for 28 days led to decreased expression of the glutamate receptor subunits GluA1, GluA2, GluN2A, and GluN2B; decreased expression of the synaptic proteins Syn and PSD-95; decreased dendrite spine density; impairments in long-term potentiation (LTP) and synaptic transmission in the hippocampal CA1 area; and deterioration of learning and memory in mice. Furthermore, the reduced glutamate receptor subunit and synaptic protein expression and the LTP deficits were still observed on day 28 after the last injection of ketamine. We found that the expression and phosphorylation of CaMKIIβ, ERK1/2, CREB, and NF-κB were inhibited by ketamine. The reductions in glutamate receptor subunit expression and dendritic spine density and the deficits in LTP, synaptic transmission, and cognition were alleviated by overexpression of CaMKIIβ. Our study indicates that inhibition of CaMKIIβ-ERK1/2-CREB/NF-κB signaling may mediate chronic ketamine use-associated cognitive impairments by restraining synaptic signaling. Hypofunction of the glutamatergic system might be the underlying mechanism accounting for chronic ketamine use-associated cognitive impairments. Our findings may suggest possible strategies to alleviate ketamine use-associated cognitive deficits and broaden the clinical use of ketamine in depression treatment.
Collapse
|
10
|
Zhao X, Tran H, DeRosa H, Roderick RC, Kentner AC. Hidden talents: Poly (I:C)-induced maternal immune activation improves mouse visual discrimination performance and reversal learning in a sex-dependent manner. GENES BRAIN AND BEHAVIOR 2021; 20:e12755. [PMID: 34056840 DOI: 10.1111/gbb.12755] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/28/2021] [Accepted: 05/29/2021] [Indexed: 12/13/2022]
Abstract
While there is a strong focus on the negative consequences of maternal immune activation (MIA) on developing brains, very little attention is directed towards potential advantages of early life challenges. In this study, we utilized a polyinosine-polycytidylic acid (poly(I:C)) MIA model to test visual pairwise discrimination (PD) and reversal learning (RL) in mice using touchscreen technology. Significant sex differences emerged in that MIA reduced the latency for males to make a correct choice in the PD task while females reached criterion sooner, made fewer errors, and utilized fewer correction trials in RL compared to saline controls. These surprising improvements were accompanied by the sex-specific upregulation of several genes critical to cognitive functioning, indicative of compensatory plasticity in response to MIA. In contrast, when exposed to a 'two-hit' stress model (MIA + loss of the social component of environmental enrichment [EE]), mice did not display anhedonia but required an increased number of PD and RL correction trials. These animals also had significant reductions of CamK2a mRNA in the prefrontal cortex. Appropriate functioning of synaptic plasticity, via mediators such as this protein kinase and others, are critical for behavioral flexibility. Although EE has been implicated in, delaying the appearance of symptoms associated with certain brain disorders, these findings are in line with evidence that it also makes individuals more vulnerable to its loss. Overall, with the right 'dose', early life stress exposure can confer at least some functional advantages, which are lost when the number or magnitude of these exposures become too great.
Collapse
Affiliation(s)
- Xin Zhao
- School of Arts & Sciences, Health Psychology Program, Massachusetts College of Pharmacy and Health Sciences, Boston, Massachusetts, USA
| | - Hieu Tran
- School of Arts & Sciences, Health Psychology Program, Massachusetts College of Pharmacy and Health Sciences, Boston, Massachusetts, USA
| | - Holly DeRosa
- School of Arts & Sciences, Health Psychology Program, Massachusetts College of Pharmacy and Health Sciences, Boston, Massachusetts, USA
| | - Ryland C Roderick
- School of Arts & Sciences, Health Psychology Program, Massachusetts College of Pharmacy and Health Sciences, Boston, Massachusetts, USA
| | - Amanda C Kentner
- School of Arts & Sciences, Health Psychology Program, Massachusetts College of Pharmacy and Health Sciences, Boston, Massachusetts, USA
| |
Collapse
|
11
|
Mineur YS, Picciotto MR. The role of acetylcholine in negative encoding bias: Too much of a good thing? Eur J Neurosci 2021; 53:114-125. [PMID: 31821620 PMCID: PMC7282966 DOI: 10.1111/ejn.14641] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 11/19/2019] [Accepted: 11/26/2019] [Indexed: 12/28/2022]
Abstract
Optimal acetylcholine (ACh) signaling is important for sustained attention and facilitates learning and memory. At the same time, human and animal studies have demonstrated increased levels of ACh in the brain during depressive episodes and increased symptoms of anxiety, depression, and reactivity to stress when ACh breakdown is impaired. While it is possible that the neuromodulatory roles of ACh in cognitive and affective processes are distinct, one possibility is that homeostatic levels of ACh signaling are necessary for appropriate learning, but overly high levels of cholinergic signaling promote encoding of stressful events, leading to the negative encoding bias that is a core symptom of depression. In this review, we outline this hypothesis and suggest potential neural pathways and underlying mechanisms that may support a role for ACh signaling in negative encoding bias.
Collapse
Affiliation(s)
- Yann S. Mineur
- Department of Psychiatry, Yale University School of Medicine, 34 Park Street, 3 Floor Research, New Haven, CT 06508, USA
| | - Marina R. Picciotto
- Department of Psychiatry, Yale University School of Medicine, 34 Park Street, 3 Floor Research, New Haven, CT 06508, USA
| |
Collapse
|
12
|
Effects of exercise on proactive interference in memory: potential neuroplasticity and neurochemical mechanisms. Psychopharmacology (Berl) 2020; 237:1917-1929. [PMID: 32488351 DOI: 10.1007/s00213-020-05554-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 05/11/2020] [Indexed: 02/07/2023]
Abstract
Proactive interference occurs when consolidated memory traces inhibit new learning. This kind of interference decreases the efficiency of new learning and also causes memory errors. Exercise has been shown to facilitate some types of cognitive function; however, whether exercise reduces proactive interference to enhance learning efficiency is not well understood. Thus, this review discusses the effects of exercise on proactive memory interference and explores potential mechanisms, such as neurogenesis and neurochemical changes, mediating any effect.
Collapse
|
13
|
Prevention of age-associated neuronal hyperexcitability with improved learning and attention upon knockout or antagonism of LPAR2. Cell Mol Life Sci 2020; 78:1029-1050. [PMID: 32468095 PMCID: PMC7897625 DOI: 10.1007/s00018-020-03553-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 04/16/2020] [Accepted: 05/13/2020] [Indexed: 12/20/2022]
Abstract
Recent studies suggest that synaptic lysophosphatidic acids (LPAs) augment glutamate-dependent cortical excitability and sensory information processing in mice and humans via presynaptic LPAR2 activation. Here, we studied the consequences of LPAR2 deletion or antagonism on various aspects of cognition using a set of behavioral and electrophysiological analyses. Hippocampal neuronal network activity was decreased in middle-aged LPAR2−/− mice, whereas hippocampal long-term potentiation (LTP) was increased suggesting cognitive advantages of LPAR2−/− mice. In line with the lower excitability, RNAseq studies revealed reduced transcription of neuronal activity markers in the dentate gyrus of the hippocampus in naïve LPAR2−/− mice, including ARC, FOS, FOSB, NR4A, NPAS4 and EGR2. LPAR2−/− mice behaved similarly to wild-type controls in maze tests of spatial or social learning and memory but showed faster and accurate responses in a 5-choice serial reaction touchscreen task requiring high attention and fast spatial discrimination. In IntelliCage learning experiments, LPAR2−/− were less active during daytime but normally active at night, and showed higher accuracy and attention to LED cues during active times. Overall, they maintained equal or superior licking success with fewer trials. Pharmacological block of the LPAR2 receptor recapitulated the LPAR2−/− phenotype, which was characterized by economic corner usage, stronger daytime resting behavior and higher proportions of correct trials. We conclude that LPAR2 stabilizes neuronal network excitability upon aging and allows for more efficient use of resting periods, better memory consolidation and better performance in tasks requiring high selective attention. Therapeutic LPAR2 antagonism may alleviate aging-associated cognitive dysfunctions.
Collapse
|
14
|
Hu JH, Malloy C, Tabor GT, Gutzmann JJ, Liu Y, Abebe D, Karlsson RM, Durell S, Cameron HA, Hoffman DA. Activity-dependent isomerization of Kv4.2 by Pin1 regulates cognitive flexibility. Nat Commun 2020; 11:1567. [PMID: 32218435 PMCID: PMC7099064 DOI: 10.1038/s41467-020-15390-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 02/29/2020] [Indexed: 11/28/2022] Open
Abstract
Voltage-gated K+ channels function in macromolecular complexes with accessory subunits to regulate brain function. Here, we describe a peptidyl-prolyl cis-trans isomerase NIMA-interacting 1 (Pin1)-dependent mechanism that regulates the association of the A-type K+ channel subunit Kv4.2 with its auxiliary subunit dipeptidyl peptidase 6 (DPP6), and thereby modulates neuronal excitability and cognitive flexibility. We show that activity-induced Kv4.2 phosphorylation triggers Pin1 binding to, and isomerization of, Kv4.2 at the pThr607-Pro motif, leading to the dissociation of the Kv4.2-DPP6 complex. We generated a novel mouse line harboring a knock-in Thr607 to Ala (Kv4.2TA) mutation that abolished dynamic Pin1 binding to Kv4.2. CA1 pyramidal neurons of the hippocampus from these mice exhibited altered Kv4.2-DPP6 interaction, increased A-type K+ current, and reduced neuronal excitability. Behaviorally, Kv4.2TA mice displayed normal initial learning but improved reversal learning in both Morris water maze and lever press paradigms. These findings reveal a Pin1-mediated mechanism regulating reversal learning and provide potential targets for the treatment of neuropsychiatric disorders characterized by cognitive inflexibility.
Collapse
Affiliation(s)
- Jia-Hua Hu
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA
| | - Cole Malloy
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA
| | - G Travis Tabor
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA
- Medical Scientist Training Program, Washington University School of Medicine in St. Louis, St. Louis, MO, 63110, USA
| | - Jakob J Gutzmann
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA
| | - Ying Liu
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA
| | - Daniel Abebe
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA
| | - Rose-Marie Karlsson
- Section on Neuroplasticity, National Institute of Mental Health, Bethesda, MD, 20892, USA
| | - Stewart Durell
- Laboratory of Cell Biology, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Heather A Cameron
- Section on Neuroplasticity, National Institute of Mental Health, Bethesda, MD, 20892, USA
| | - Dax A Hoffman
- Section on Molecular Neurophysiology and Biophysics, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, 20892, USA.
| |
Collapse
|
15
|
Walker LC, Lawrence AJ. Allosteric modulation of muscarinic receptors in alcohol and substance use disorders. FROM STRUCTURE TO CLINICAL DEVELOPMENT: ALLOSTERIC MODULATION OF G PROTEIN-COUPLED RECEPTORS 2020; 88:233-275. [DOI: 10.1016/bs.apha.2020.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
16
|
Moran SP, Maksymetz J, Conn PJ. Targeting Muscarinic Acetylcholine Receptors for the Treatment of Psychiatric and Neurological Disorders. Trends Pharmacol Sci 2019; 40:1006-1020. [PMID: 31711626 DOI: 10.1016/j.tips.2019.10.007] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 10/17/2019] [Accepted: 10/17/2019] [Indexed: 12/12/2022]
Abstract
Muscarinic acetylcholine receptors (mAChR) play important roles in regulating complex behaviors such as cognition, movement, and reward, making them ideally situated as potential drug targets for the treatment of several brain disorders. Recent advances in the discovery of subtype-selective allosteric modulators for mAChRs has provided an unprecedented opportunity for highly specific modulation of signaling by individual mAChR subtypes in the brain. Recently, mAChR allosteric modulators have entered clinical development for Alzheimer's disease (AD) and schizophrenia, and have potential utility for other brain disorders. However, mAChR allosteric modulators can display a diverse array of pharmacological properties, and a more nuanced understanding of the mAChR will be necessary to best translate preclinical findings into successful clinical treatments.
Collapse
Affiliation(s)
- Sean P Moran
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN 37232, USA; Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA; Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, TN 37232, USA
| | - James Maksymetz
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA; Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, TN 37232, USA
| | - P Jeffrey Conn
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN 37232, USA; Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA; Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, TN 37232, USA.
| |
Collapse
|
17
|
Hopper S, Pavey GM, Gogos A, Dean B. Widespread Changes in Positive Allosteric Modulation of the Muscarinic M1 Receptor in Some Participants With Schizophrenia. Int J Neuropsychopharmacol 2019; 22:640-650. [PMID: 31428788 PMCID: PMC6822142 DOI: 10.1093/ijnp/pyz045] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/22/2019] [Accepted: 08/15/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Preclinical and some human data suggest allosteric modulation of the muscarinic M1 receptor (CHRM1) is a promising approach for the treatment of schizophrenia. However, it is suggested there is a subgroup of participants with schizophrenia who have profound loss of cortical CHRM1 (MRDS). This raises the possibility that some participants with schizophrenia may not respond optimally to CHRM1 allosteric modulation. Here we describe a novel methodology to measure positive allosteric modulation of CHRM1 in human CNS and the measurement of that response in the cortex, hippocampus, and striatum from participants with MRDS, non-MRDS and controls. METHODS The cortex (Brodmann's area 6), hippocampus, and striatum from 40 participants with schizophrenia (20 MRDS and 20 non-MRDS) and 20 controls were used to measure benzyl quinolone carboxylic acid-mediated shift in acetylcholine displacement of [3H]N-methylscopolamine using a novel in situ radioligand binding with autoradiography methodology. RESULTS Compared with controls, participants with schizophrenia had lower levels of specific [3H]N-methylscopolamine binding in all CNS regions, whilst benzyl quinolone carboxylic acid-modulated binding was less in the striatum, Brodmann's area 6, dentate gyrus, and subiculum. When divided by subgroup, only in MRDS was there lower specific [3H]N-methylscopolamine binding and less benzyl quinolone carboxylic acid-modulated binding in all cortical and subcortical regions studied. CONCLUSIONS In a subgroup of participants with schizophrenia, there is a widespread decreased responsiveness to a positive allosteric modulator at the CHRM1. This finding may have ramifications it positive allosteric modulators of the CHRM1 are used in clinical trials to treat schizophrenia as some participants may not have an optimal response.
Collapse
Affiliation(s)
- Shaun Hopper
- The Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia,Cooperative Research Centre for Mental Health, Parkville, Victoria, Australia
| | - Geoffrey Mark Pavey
- The Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia
| | - Andrea Gogos
- The Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia
| | - Brian Dean
- The Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia,Cooperative Research Centre for Mental Health, Parkville, Victoria, Australia,The Centre for Mental Health, Swinburne University, Hawthorn, Victoria, Australia,Correspondence: Professor Brian Dean, Head, The Molecular Psychiatry Laboratories, The Florey Institute for Neuroscience and Mental Health, 30 Royal Parade, Parkville, VIC 3010, Australia ()
| |
Collapse
|
18
|
Zhao LX, Chen MW, Qian Y, Yang QH, Ge YH, Chen HZ, Qiu Y. M1 Muscarinic Receptor Activation Rescues β-Amyloid-Induced Cognitive Impairment through AMPA Receptor GluA1 Subunit. Neuroscience 2019; 408:239-247. [PMID: 30981860 DOI: 10.1016/j.neuroscience.2019.04.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/15/2019] [Accepted: 04/02/2019] [Indexed: 10/27/2022]
Abstract
M1 muscarinic receptors have long been identified as a potential therapeutic target for the treatment of cognitive impairment in Alzheimer's disease (AD). Our previous study has shown that M1 receptors promote membrane insertion and synaptic delivery of AMPA receptor GluA1 subunit. In this study, we sought to determine whether activation of M1 receptor would rescue the cognitive impairment in AD model mice through modulation of GluA1 subunit. For the mice injected with aggregated β-amyloid (Aβ) fragments to impair learning and memory, activation of M1 receptors could rescue it by reducing the latency to find the platform and spending more time in the target quadrant in the probe test in the Morris water maze. However, such an effect was ablated in mice with Ser845 residue of GluA1 mutated to alanine. Furthermore, the activation of M1 receptors enhanced the expression of GluA1 and its phosphorylation at Ser845 and drove GluA1 to incorporate with PSD95, a postsynaptic marker, in the hippocampi from Aβ-injected wild type mice but not from the mutant mice. Moreover, for 9-month-old APP/PS1 transgenic AD model mice, which may resemble the late AD, M1 receptor activation could not improve the cognitive impairment significantly. In addition, the enhancement of GluA1 expression and its phosphorylation at Ser845 were not observed in their hippocampi. Taken together, the study indicated that M1 receptor activation rescued the cognitive deficit through modulating the trafficking of GluA1-containing AMPA receptors and the therapeutics targeting M1 receptors should aim at mild AD or even pre-AD.
Collapse
Affiliation(s)
- Lan-Xue Zhao
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Mu-Wen Chen
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Yue Qian
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Qian-Hao Yang
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Yan-Hui Ge
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Hong-Zhuan Chen
- Institute of Interdisciplinary Integrative Biomedical Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201210, China.
| | - Yu Qiu
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| |
Collapse
|