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Zhu M, Cui L, Liu G, Yu P, Hu Q, Chen H, Hou H. UHPLC-MS/MS combined with microdialysis for simultaneous determination of nicotine and neurotransmitter metabolites in the rat hippocampal brain region: application to pharmacokinetic and pharmacodynamic study. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:3815-3830. [PMID: 38738307 DOI: 10.1039/d4ay00522h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
Nicotine crosses the blood-brain barrier and interacts with nicotinic acetylcholine receptors, initiating a cascade of neurotransmitter effects with potential therapeutic implications for neurodegenerative conditions such as Alzheimer's and Parkinson's disease. The hippocampus, pivotal for cognitive processes, plays a crucial role in nicotine-mediated cognitive enhancement due to its abundant expression of nicotinic acetylcholine receptors, particularly the α7 subtype, which is heavily implicated in hippocampus-related behavioral functions and dysfunctions. However, the intricate process of nicotine metabolism within the hippocampus remains poorly understood, impeding our comprehension of how nicotine and its metabolites modulate neurotransmitter dynamics. To address this gap, we have developed and validated a novel methodology combining microdialysis with UHPLC-MS/MS, enabling simultaneous detection of 12 neurotransmitters, nicotine, and its seven metabolites within the rat hippocampus. The linearity range of the targeted compounds is satisfactory (R2 > 0.9970), with intra-day and inter-day precision not exceeding 12.7%, and accuracy ranging from -12.4% to 13.7%. Our findings reveal differential pharmacokinetics of nicotine and its metabolites in the α7KO group compared to the control group, characterized by heightened nicotine absorption and slower elimination and distribution in the former. Notably, the pharmacokinetic parameters of cotinine exhibit similarity across both groups. Studies investigating the impact of nicotine on monoamine neurotransmitters have elucidated its capacity to augment the release of dopamine, serotonin, norepinephrine, glutamate, and acetylcholine in the rat hippocampus. This integrated approach facilitates a comprehensive analysis of neurotransmitter alterations within the hippocampal region following nicotine administration, thereby providing robust technical support and scientific rationale for understanding the neurochemical effects of nicotine and its metabolites. Further exploration into the pharmacokinetics and pharmacodynamics of nicotine holds promise for uncovering novel therapeutic avenues in the management of neurodegenerative diseases such as Alzheimer's.
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Affiliation(s)
- Mingyu Zhu
- Institute of Biomedical Engineering, College of Life Sciences, Qingdao University, Qingdao, 266071, China
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
| | - Lili Cui
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
| | - Guanglin Liu
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
| | - Pengpeng Yu
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
| | - Qingyuan Hu
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
| | - Huan Chen
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
| | - Hongwei Hou
- China National Tobacco Quality Supervision and Test Center, Key Laboratory of Tobacco Biological Effects, Zhengzhou, 450001, China.
- Beijing Life Science Academy, Beijing, 100101, China
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2
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Ibrahim WW, Sayed RH, Abdelhameed MF, Omara EA, Nassar MI, Abdelkader NF, Farag MA, Elshamy AI, Afifi SM. Neuroprotective potential of Erigeron bonariensis ethanolic extract against ovariectomized/D-galactose-induced memory impairments in female rats in relation to its metabolite fingerprint as revealed using UPLC/MS. Inflammopharmacology 2024; 32:1091-1112. [PMID: 38294617 PMCID: PMC11006746 DOI: 10.1007/s10787-023-01418-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 12/22/2023] [Indexed: 02/01/2024]
Abstract
Erigeron bonariensis is widely distributed throughout the world's tropics and subtropics. In folk medicine, E. bonariensis has historically been used to treat head and brain diseases. Alzheimer's disease (AD) is the most widespread form of dementia initiated via disturbances in brain function. Herein, the neuroprotective effect of the chemically characterized E. bonariensis ethanolic extract is reported for the first time in an AD animal model. Chemical profiling was conducted using UPLC-ESI-MS analysis. Female rats underwent ovariectomy (OVX) followed by 42 days of D-galactose (D-Gal) administration (150 mg/kg/day, i.p) to induce AD. The OVX/D-Gal-subjected rats received either donepezil (5 mg/kg/day) or E. bonariensis at 50, 100, and 200 mg/kg/day, given 1 h prior to D-Gal. UPLC-ESI-MS analysis identified 42 chemicals, including flavonoids, phenolic acids, terpenes, and nitrogenous constituents. Several metabolites, such as isoschaftoside, casticin, velutin, pantothenic acid, xanthurenic acid, C18-sphingosine, linoleamide, and erucamide, were reported herein for the first time in Erigeron genus. Treatment with E. bonariensis extract mitigated the cognitive decline in the Morris Water Maze test and the histopathological alterations in cortical and hippocampal tissues of OVX/D-Gal-subjected rats. Moreover, E. bonariensis extract mitigated OVX/D-Gal-induced Aβ aggregation, Tau hyperphosphorylation, AChE activity, neuroinflammation (NF-κBp65, TNF-α, IL-1β), and apoptosis (Cytc, BAX). Additionally, E. bonariensis extract ameliorated AD by increasing α7-nAChRs expression, down-regulating GSK-3β and FOXO3a expression, and modulating Jak2/STAT3/NF-ĸB p65 and PI3K/AKT signaling cascades. These findings demonstrate the neuroprotective and memory-enhancing effects of E. bonariensis extract in the OVX/D-Gal rat model, highlighting its potential as a promising candidate for AD management.
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Affiliation(s)
- Weam W Ibrahim
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., Cairo, 11562, Egypt
| | - Rabab H Sayed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., Cairo, 11562, Egypt
| | | | - Enayat A Omara
- Pathology Department, National Research Center, Dokki, Cairo, 12622, Egypt
| | - Mahmoud I Nassar
- Natural Compounds Chemistry Department, National Research Centre, Dokki, 12622, Giza, Egypt
| | - Noha F Abdelkader
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., Cairo, 11562, Egypt.
| | - Mohamed A Farag
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Kasr El Aini St., Cairo, 11562, Egypt
| | - Abdelsamed I Elshamy
- Natural Compounds Chemistry Department, National Research Centre, Dokki, 12622, Giza, Egypt.
| | - Sherif M Afifi
- Pharmacognosy Department, Faculty of Pharmacy, University of Sadat City, Sadat City, 32897, Egypt
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3
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Lopes PKF, Costa SDO, Simino LADP, Chaves WF, Silva FA, Costa CL, Milanski M, Ignacio-Souza LM, Torsoni AS, Torsoni MA. Hypothalamic inflammation and the development of an obese phenotype induced by high-fat diet consumption is exacerbated in alpha7 nicotinic cholinergic receptor knockout mice. Food Res Int 2024; 176:113808. [PMID: 38163714 DOI: 10.1016/j.foodres.2023.113808] [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: 09/14/2023] [Revised: 11/27/2023] [Accepted: 12/02/2023] [Indexed: 01/03/2024]
Abstract
Hypothalamic inflammation and metabolic changes resulting from the consumption of high-fat diets have been linked to low grade inflammation and obesity. Inflammation impairs the hypothalamic expression of α7 nicotinic acetylcholine receptor (α7nAChR). The α7nAChR is described as the main component of the anti-inflammatory cholinergic pathway in different inflammation models. To assess whether the reduction in α7nAChR expression exacerbates hypothalamic inflammation induced by a high-fat diet (HFD), were used male and female global α7nAChR knockout mouse line in normal or high-fat diet for 4 weeks. Body weight gain, adiposity, glucose homeostasis, hypothalamic inflammation, food intake, and energy expenditure were evaluated. Insulin sensitivity was evaluated in neuronal cell culture. Consumption of an HFD for 4 weeks resulted in body weight gain and adiposity in male Chrna7-/- mice and the hypothalamus of male Chrna7-/- mice showed neuroinflammatory markers, with increased gene expression of pro-inflammatory cytokines and dysregulation in the nuclear factor kappa B pathway. Moreover, male Chrna7-/- mice consuming an HFD showed alterations in glucose homeostasis and serum of Chrna7-/- mice that consumed an HFD impaired insulin signalling in neuronal cell culture experiments. In general, female Chrna7-/- mice that consumed an HFD did not show the phenotypic and molecular changes found in male mice, indicating that there is sexual dimorphism in the analysed parameters. Thus, receptor deletion resulted in increased susceptibility to hypothalamic inflammation and metabolic damage associated with HFD consumption in male mice.
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Affiliation(s)
| | - Suleyma de Oliveira Costa
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil
| | - Laís A de Paula Simino
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil
| | - Wenicios Ferreira Chaves
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil
| | - Franciely Alves Silva
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil
| | - Caroline Lobo Costa
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil
| | - Marciane Milanski
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil; Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Brazil
| | - Leticia Martins Ignacio-Souza
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil; Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Brazil
| | - Adriana Souza Torsoni
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil; Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Brazil
| | - Marcio Alberto Torsoni
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Brazil; Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Brazil.
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4
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Genetic deletion of α7 nicotinic acetylcholine receptors induces an age-dependent Alzheimer's disease-like pathology. Prog Neurobiol 2021; 206:102154. [PMID: 34453977 DOI: 10.1016/j.pneurobio.2021.102154] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 05/29/2021] [Accepted: 08/18/2021] [Indexed: 11/22/2022]
Abstract
The accumulation of amyloid-beta peptide (Aβ) and the failure of cholinergic transmission are key players in Alzheimer's disease (AD). However, in the healthy brain, Aβ contributes to synaptic plasticity and memory acting through α7 subtype nicotinic acetylcholine receptors (α7nAChRs). Here, we hypothesized that the α7nAChR deletion blocks Aβ physiological function and promotes a compensatory increase in Aβ levels that, in turn, triggers an AD-like pathology. To validate this hypothesis, we studied the age-dependent phenotype of α7 knock out mice. We found that α7nAChR deletion caused an impairment of hippocampal synaptic plasticity and memory at 12 months of age, paralleled by an increase of Amyloid Precursor Protein expression and Aβ levels. This was accompanied by other classical AD features such as a hyperphosphorylation of tau at residues Ser 199, Ser 396, Thr 205, a decrease of GSK-3β at Ser 9, the presence of paired helical filaments and neurofibrillary tangles, neuronal loss and an increase of GFAP-positive astrocytes. Our findings suggest that α7nAChR malfunction might precede Aβ and tau pathology, offering a different perspective to interpret the failure of anti-Aβ therapies against AD and to find novel therapeutical approaches aimed at restoring α7nAChRs-mediated Aβ function at the synapse.
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5
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Wong KY, Roy J, Fung ML, Heng BC, Zhang C, Lim LW. Relationships between Mitochondrial Dysfunction and Neurotransmission Failure in Alzheimer's Disease. Aging Dis 2020; 11:1291-1316. [PMID: 33014538 PMCID: PMC7505271 DOI: 10.14336/ad.2019.1125] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 11/25/2019] [Indexed: 12/12/2022] Open
Abstract
Besides extracellular deposition of amyloid beta and formation of phosphorylated tau in the brains of patients with Alzheimer's disease (AD), the pathogenesis of AD is also thought to involve mitochondrial dysfunctions and altered neurotransmission systems. However, none of these components can describe the diverse cognitive, behavioural, and psychiatric symptoms of AD without the pathologies interacting with one another. The purpose of this review is to understand the relationships between mitochondrial and neurotransmission dysfunctions in terms of (1) how mitochondrial alterations affect cholinergic and monoaminergic systems via disruption of energy metabolism, oxidative stress, and apoptosis; and (2) how different neurotransmission systems drive mitochondrial dysfunction via increasing amyloid beta internalisation, oxidative stress, disruption of mitochondrial permeabilisation, and mitochondrial trafficking. All these interactions are separately discussed in terms of neurotransmission systems. The association of mitochondrial dysfunctions with alterations in dopamine, norepinephrine, and histamine is the prospective goal in this research field. By unfolding the complex interactions surrounding mitochondrial dysfunction in AD, we can better develop potential treatments to delay, prevent, or cure this devastating disease.
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Affiliation(s)
- Kan Yin Wong
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.
| | - Jaydeep Roy
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.
| | - Man Lung Fung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.
| | - Boon Chin Heng
- Peking University School of Stomatology, Beijing, China.
| | - Chengfei Zhang
- Endodontology, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
| | - Lee Wei Lim
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.
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6
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Shenkarev ZO, Shulepko MA, Bychkov ML, Kulbatskii DS, Shlepova OV, Vasilyeva NA, Andreev-Andrievskiy AA, Popova AS, Lagereva EA, Loktyushov EV, Koshelev SG, Thomsen MS, Dolgikh DA, Kozlov SA, Balaban PM, Kirpichnikov MP, Lyukmanova EN. Water-soluble variant of human Lynx1 positively modulates synaptic plasticity and ameliorates cognitive impairment associated with α7-nAChR dysfunction. J Neurochem 2020; 155:45-61. [PMID: 32222974 DOI: 10.1111/jnc.15018] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 02/18/2020] [Accepted: 03/18/2020] [Indexed: 11/30/2022]
Abstract
Lynx1 is a GPI-tethered protein colocalized with nicotinic acetylcholine receptors (nAChRs) in the brain areas important for learning and memory. Previously, we demonstrated that at low micromolar concentrations the water-soluble Lynx1 variant lacking GPI-anchor (ws-Lynx1) acts on α7-nAChRs as a positive allosteric modulator. We hypothesized that ws-Lynx1 could be used for improvement of cognitive processes dependent on nAChRs. Here we showed that 2 µM ws-Lynx1 increased the acetylcholine-evoked current at α7-nAChRs in the rat primary visual cortex L1 interneurons. At higher concentrations ws-Lynx1 inhibits α7-nAChRs expressed in Xenopus laevis oocytes with IC50 ~ 50 µM. In mice, ws-Lynx1 penetrated the blood-brain barrier upon intranasal administration and accumulated in the cortex, hippocampus, and cerebellum. Chronic ws-Lynx1 treatment prevented the olfactory memory and motor learning impairment induced by the α7-nAChRs inhibitor methyllycaconitine (MLA). Enhanced long-term potentiation and increased paired-pulse facilitation ratio were observed in the hippocampal slices incubated with ws-Lynx1 and in the slices from ws-Lynx1-treated mice. Long-term potentiation blockade observed in MLA-treated mice was abolished by ws-Lynx1 co-administration. To understand the mechanism of ws-Lynx1 action, we studied the interaction of ws-Lynx1 and MLA at α7-nAChRs, measured the basal concentrations of endogenous Lynx1 and the α7 nAChR subunit and their association in the mouse brain. Our findings suggest that endogenous Lynx1 limits α7-nAChRs activation in the adult brain. Ws-Lynx1 partially displaces Lynx1 causing positive modulation of α7-nAChRs and enhancement of synaptic plasticity. Ws-Lynx1 and similar compounds may constitute useful hits for treatment of cognitive deficits associated with the cholinergic system dysfunction.
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Affiliation(s)
- Zakhar O Shenkarev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia.,Moscow Institute of Physics and Technology, Moscow region, Russia
| | - Mikhail A Shulepko
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Maxim L Bychkov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Dmitrii S Kulbatskii
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Olga V Shlepova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia.,Moscow Institute of Physics and Technology, Moscow region, Russia
| | - Nathalia A Vasilyeva
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia.,Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia
| | - Alexander A Andreev-Andrievskiy
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia.,Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Anfisa S Popova
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia.,Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Evgeniya A Lagereva
- Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | | | - Sergey G Koshelev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | | | - Dmitry A Dolgikh
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Sergey A Kozlov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Pavel M Balaban
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia.,Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia
| | - Mikhail P Kirpichnikov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia.,Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Ekaterina N Lyukmanova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia.,Moscow Institute of Physics and Technology, Moscow region, Russia
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Positive allosteric modulation of the α7 nicotinic acetylcholine receptor as a treatment for cognitive deficits after traumatic brain injury. PLoS One 2019; 14:e0223180. [PMID: 31581202 PMCID: PMC6776323 DOI: 10.1371/journal.pone.0223180] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 09/16/2019] [Indexed: 11/19/2022] Open
Abstract
Cognitive impairments are a common consequence of traumatic brain injury (TBI). The hippocampus is a subcortical structure that plays a key role in the formation of declarative memories and is highly vulnerable to TBI. The α7 nicotinic acetylcholine receptor (nAChR) is highly expressed in the hippocampus and reduced expression and function of this receptor are linked with cognitive impairments in Alzheimer's disease and schizophrenia. Positive allosteric modulation of α7 nAChRs with AVL-3288 enhances receptor currents and improves cognitive functioning in naïve animals and healthy human subjects. Therefore, we hypothesized that targeting the α7 nAChR with the positive allosteric modulator AVL-3288 would enhance cognitive functioning in the chronic recovery period of TBI. To test this hypothesis, adult male Sprague Dawley rats received moderate parasagittal fluid-percussion brain injury or sham surgery. At 3 months after recovery, animals were treated with vehicle or AVL-3288 at 30 min prior to cue and contextual fear conditioning and the water maze task. Treatment of TBI animals with AVL-3288 rescued learning and memory deficits in water maze retention and working memory. AVL-3288 treatment also improved cue and contextual fear memory when tested at 24 hr and 1 month after training, when TBI animals were treated acutely just during fear conditioning at 3 months post-TBI. Hippocampal atrophy but not cortical atrophy was reduced with AVL-3288 treatment in the chronic recovery phase of TBI. AVL-3288 application to acute hippocampal slices from animals at 3 months after TBI rescued basal synaptic transmission deficits and long-term potentiation (LTP) in area CA1. Our results demonstrate that AVL-3288 improves hippocampal synaptic plasticity, and learning and memory performance after TBI in the chronic recovery period. Enhancing cholinergic transmission through positive allosteric modulation of the α7 nAChR may be a novel therapeutic to improve cognition after TBI.
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8
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Lykhmus O, Kalashnyk O, Koval L, Voytenko L, Uspenska K, Komisarenko S, Deryabina O, Shuvalova N, Kordium V, Ustymenko A, Kyryk V, Skok M. Mesenchymal Stem Cells or Interleukin-6 Improve Episodic Memory of Mice Lacking α7 Nicotinic Acetylcholine Receptors. Neuroscience 2019; 413:31-44. [DOI: 10.1016/j.neuroscience.2019.06.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/20/2019] [Accepted: 06/04/2019] [Indexed: 12/11/2022]
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9
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Cecon E, Dam J, Luka M, Gautier C, Chollet AM, Delagrange P, Danober L, Jockers R. Quantitative assessment of oligomeric amyloid β peptide binding to α7 nicotinic receptor. Br J Pharmacol 2019; 176:3475-3488. [PMID: 30981214 DOI: 10.1111/bph.14688] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 03/14/2019] [Accepted: 03/19/2019] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND AND PURPOSE Progressive dysfunction of cholinergic transmission is a well-known characteristic of Alzheimer's disease (AD). Amyloid β (Aβ) peptide oligomers are known to play a central role in AD and are suggested to impair the function of the cholinergic nicotinic ACh receptor α7 (α7nAChR). However, the mechanism underlying the effect of Aβ on α7nAChR function is not fully understood, limiting the therapeutic exploration of this observation in AD. Here, we aimed to detect and characterize Aβ binding to α7nAChR, including the possibility of interfering with this interaction for therapeutic purposes. EXPERIMENTAL APPROACH We developed a specific and quantitative time-resolved FRET (TR-FRET)-based binding assay for Aβ to α7nAChR and pharmacologically characterized this interaction. KEY RESULTS We demonstrated specific and high-affinity (low nanomolar) binding of Aβ to the orthosteric binding site of α7nAChR. Aβ binding was prevented and reversed by the well-characterized orthosteric ligands of α7nAChR (epibatidine, α-bungarotoxin, methylylcaconitine, PNU-282987, S24795, and EVP6124) and by the type II positive allosteric modulator (PAM) PNU-120596 but not by the type I PAM NS1738. CONCLUSIONS AND IMPLICATIONS Our TR-FRET Aβ binding assay demonstrates for the first time the specific binding of Aβ to α7nAChR, which will be a crucial tool for the development, testing, and selection of a novel generation of AD drug candidates targeting Aβ/α7nAChR complexes with high specificity and fewer side effects compared to currently approved α7nAChR drugs. LINKED ARTICLES This article is part of a themed section on Therapeutics for Dementia and Alzheimer's Disease: New Directions for Precision Medicine. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v176.18/issuetoc.
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Affiliation(s)
- Erika Cecon
- Inserm U1016, Institut Cochin, Dept Endocrinology, Metabolism and Diabetes, Paris, France.,CNRS UMR 8104, Paris, France.,University Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Julie Dam
- Inserm U1016, Institut Cochin, Dept Endocrinology, Metabolism and Diabetes, Paris, France.,CNRS UMR 8104, Paris, France.,University Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Marine Luka
- Inserm U1016, Institut Cochin, Dept Endocrinology, Metabolism and Diabetes, Paris, France.,CNRS UMR 8104, Paris, France.,University Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Clément Gautier
- Institut de Recherches SERVIER, Division Therapeutic Innovation in Neuropsychiatry, Croissy-sur-Seine, France
| | - Anne-Marie Chollet
- Institut de Recherches SERVIER, Division Therapeutic Innovation in Neuropsychiatry, Croissy-sur-Seine, France
| | - Philippe Delagrange
- Institut de Recherches SERVIER, Division Therapeutic Innovation in Neuropsychiatry, Croissy-sur-Seine, France
| | - Laurence Danober
- Institut de Recherches SERVIER, Division Therapeutic Innovation in Neuropsychiatry, Croissy-sur-Seine, France
| | - Ralf Jockers
- Inserm U1016, Institut Cochin, Dept Endocrinology, Metabolism and Diabetes, Paris, France.,CNRS UMR 8104, Paris, France.,University Paris Descartes, Sorbonne Paris Cité, Paris, France
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10
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Xu KL, Liu XQ, Yao YL, Ye MR, Han YG, Zhang T, Chen G, Lei M. Effect of dexmedetomidine on rats with convulsive status epilepticus and association with activation of cholinergic anti-inflammatory pathway. Biochem Biophys Res Commun 2017; 495:421-426. [PMID: 29080744 DOI: 10.1016/j.bbrc.2017.10.124] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 10/24/2017] [Indexed: 11/08/2022]
Abstract
Convulsive status epilepticus (CSE) is a neurological disease with contraction and extension of limbs, leading to damage of hippocampus and cognition. This study aimed to explore the effects of dexmedetomidine (DEX) on the cognitive function and neuroinflammation in CSE rats. All rats were divided into control group, CSE group and DEX group. Morris water maze test was used to measure cognitive function. Acute hippocampal slices were made to detect long-term potentiation (LTP). Immunohistochemistry was used to determine the expression of α7-nicotinic acetylcholine receptor (α7-nAChR) and interleukin-1β (IL-1β). Enzyme-linked immunosorbent assay (ELISA) was used to measure serum levels of IL-1β, tumor necrosis factor-α (TNF-α), S-100β and brain-derived neurotrophic factor (BDNF). Our results showed that DEX improved the memory damage caused by CSE. DEX reduced seizure severity and increased the amplitudes and sustainable time of LTP, and also inhibited the hippocampal expression of α7-nAChR and IL-1β in CSE rats. DEX treatment decreased serum IL-1β, TNF-α and S-100β levels and increased BDNF levels. The effects of DEX on seizure severity and LTP could be simulated by nicotine or attenuated by concurrent α-bungarotoxin (α-BGT) treatment. In conclusions, DEX significantly improved spatial cognitive dysfunction, reduced seizure severity and increased LTP in CSE rats. Improvements by DEX were closely related to enhancement of cholinergic anti-inflammatory pathway.
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Affiliation(s)
- Kai-Liang Xu
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China
| | - Xin-Qiu Liu
- Shanghai Institute of Medical Genetics, Shanghai Children's Hospital Affiliated to Shanghai Jiao-Tong University, Shanghai 200040, PR China
| | - Yu-Long Yao
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China
| | - Ming-Rong Ye
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China
| | - Yao-Guo Han
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China
| | - Tao Zhang
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China
| | - Gang Chen
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China
| | - Ming Lei
- Department of Critical Care Medicine, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, PR China.
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11
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Electroacupuncture alleviates surgery-induced cognitive dysfunction by increasing α7-nAChR expression and inhibiting inflammatory pathway in aged rats. Neurosci Lett 2017; 659:1-6. [PMID: 28842280 DOI: 10.1016/j.neulet.2017.08.043] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 08/01/2017] [Accepted: 08/15/2017] [Indexed: 12/27/2022]
Abstract
Postoperative cognitive dysfunction (POCD) is a common disorder of cognitive functions in aged patients following anesthesia and surgery. α7-nicotinic acetylcholine receptors (α7-nAChR) plays a regulatory role in cognitive processes and is involved in cognitive deficits. This study aims to observe the effect of electroacupuncture (EA) on the cognitive function in aged POCD rats, and its regulation on expressions of hippocampal α7-nAChR and proinflammatory factors. Ninety healthy Sprague-Dawley male aged rats were randomly divided into three groups (each n=30): control group (sham operation), model group (partial hepatectomy), and electroacupuncture (EA) group. The cognitive function was detected by Morris water-maze test, and the changes of hippocampal expressions of α7-nAChR, tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) were detected by immunohistochemical method. Our results showed that compared with the model group, the EA group had significantly shorter escape latency and decreased crossing platform times at 1d, 3d and 7d after operation (P<0.05). α7-nAChR positive neurons in the hippocampus decreased and TNF-α and IL-1β positive neurons increased on postoperative days 1, 3 and 7. Compared with the model group, the α7-nAChR positive neurons were increased and TNF-α and IL-1β positive neurons were decreased in the EA group at the same time points (P<0.05). In conclusion, the electroacupuncture regulation can improve the learning and memory abilities in POCD rats, and its mechanism may be related to upregulation of α7-nAChR and downregulation of TNF-α and IL-1β in hippocampus.
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Lombardo S, Catteau J, Besson M, Maskos U. A role for β2* nicotinic receptors in a model of local amyloid pathology induced in dentate gyrus. Neurobiol Aging 2016; 46:221-34. [DOI: 10.1016/j.neurobiolaging.2016.06.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 05/22/2016] [Accepted: 06/09/2016] [Indexed: 12/22/2022]
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Stoiljkovic M, Kelley C, Nagy D, Leventhal L, Hajós M. Selective activation of α7 nicotinic acetylcholine receptors augments hippocampal oscillations. Neuropharmacology 2016; 110:102-108. [PMID: 27422408 DOI: 10.1016/j.neuropharm.2016.07.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 05/26/2016] [Accepted: 07/10/2016] [Indexed: 01/09/2023]
Abstract
Neural α7 nicotinic acetylcholine receptors (α7 nAChRs) emerged as a potential pharmacologic target for treating cognitive deficits in schizophrenia and Alzheimer's disease. Experiments modeling these dysfunctions, as well as clinical evidence, demonstrate the relatively consistent procognitive effects of α7 nAChR agonists. One preclinical observation supporting the procognitive role of α7 nAChRs is their ability to modulate neuronal network oscillations closely associated with learning and memory, especially hippocampal oscillations. Due to the high degree of structural similarity between α7 nACh and 5-HT receptors, the majority of α7 nAChR agonists to date also act as 5-HT3 antagonists. To address this confounding property and determine the relevance of α7 nAChR agonist binding to 5-HT3 receptors in modulating hippocampal activity, we tested two well-described α7 nAChR agonists, PNU-282987 and FRM-17874, in mice lacking α7 nAChRs (α7 knock-out, α7KO) using the brainstem simulation-elicited hippocampal theta oscillation assay. Under urethane anesthesia both agonists at equivalent doses demonstrated efficacy in wild-type (WT) mice, significantly enhancing theta power and theta phase-gamma amplitude coupling as compared to saline treated control mice. These effects are comparable to those seen with drugs clinically used to treat Alzheimer's disease. Although α7KO mice showed no alterations in elicited hippocampal oscillations, both α7 nAChR agonists failed to enhance theta power or theta phase - gamma amplitude coupling in these mice. Our findings demonstrate that selective activation of α7 nAChRs can modulate hippocampal oscillation, and these receptors are the primary targets of the tested agonists, PNU-282987 and FRM-17874 and likely underlies their observed procognitive activity.
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Affiliation(s)
- Milan Stoiljkovic
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, New Haven, CT, 06520, USA
| | - Craig Kelley
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, New Haven, CT, 06520, USA
| | - Dávid Nagy
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, New Haven, CT, 06520, USA
| | | | - Mihály Hajós
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, New Haven, CT, 06520, USA.
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Freund RK, Graw S, Choo KS, Stevens KE, Leonard S, Dell'Acqua ML. Genetic knockout of the α7 nicotinic acetylcholine receptor gene alters hippocampal long-term potentiation in a background strain-dependent manner. Neurosci Lett 2016; 627:1-6. [PMID: 27233215 DOI: 10.1016/j.neulet.2016.05.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 05/18/2016] [Accepted: 05/21/2016] [Indexed: 12/01/2022]
Abstract
Reduced α7 nicotinic acetylcholine receptor (nAChR) function is linked to impaired hippocampal-dependent sensory processing and learning and memory in schizophrenia. While knockout of the Chrna7 gene encoding the α7nAChR on a C57/Bl6 background results in changes in cognitive measures, prior studies found little impact on hippocampal synaptic plasticity in these mice. However, schizophrenia is a multi-genic disorder where complex interactions between specific genetic mutations and overall genetic background may play a prominent role in determining phenotypic penetrance. Thus, we compared the consequences of knocking out the α7nAChR on synaptic plasticity in C57/Bl6 and C3H mice, which differ in their basal α7nAChR expression levels. Homozygous α7 deletion in C3H mice, which normally express higher α7nAChR levels, resulted in impaired long-term potentiation (LTP) at hippocampal CA1 synapses, while C3H α7 heterozygous mice maintained robust LTP. In contrast, homozygous α7 deletion in C57 mice, which normally express lower α7nAChR levels, did not alter LTP, as had been previously reported for this strain. Thus, the threshold of Chrna7 expression required for LTP may be different in the two strains. Measurements of auditory gating, a hippocampal-dependent behavioral paradigm used to identify schizophrenia-associated sensory processing deficits, was abnormal in C3H α7 knockout mice confirming that auditory gating also requires α7nAChR expression. Our studies highlight the importance of genetic background on the regulation of synaptic plasticity and could be relevant for understanding genetic and cognitive heterogeneity in human studies of α7nAChR dysfunction in mental disorders.
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Affiliation(s)
- Ronald K Freund
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
| | - Sharon Graw
- Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Kevin S Choo
- Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Karen E Stevens
- Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, CO, USA; Medical Research Service, Veterans Affairs Medical Center, Denver, CO, USA
| | - Sherry Leonard
- Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, CO, USA; Medical Research Service, Veterans Affairs Medical Center, Denver, CO, USA
| | - Mark L Dell'Acqua
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA; Neuroscience Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
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Fedele E, Rivera D, Marengo B, Pronzato MA, Ricciarelli R. Amyloid β: Walking on the dark side of the moon. Mech Ageing Dev 2015; 152:1-4. [DOI: 10.1016/j.mad.2015.09.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 08/31/2015] [Accepted: 09/03/2015] [Indexed: 12/20/2022]
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Stoiljkovic M, Kelley C, Nagy D, Hajós M. Modulation of hippocampal neuronal network oscillations by α7 nACh receptors. Biochem Pharmacol 2015. [DOI: 10.1016/j.bcp.2015.06.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Cheng Q, Yakel JL. The effect of α7 nicotinic receptor activation on glutamatergic transmission in the hippocampus. Biochem Pharmacol 2015. [PMID: 26212541 DOI: 10.1016/j.bcp.2015.07.015] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are expressed widely in the CNS, and mediate both synaptic and perisynaptic activities of endogenous cholinergic inputs and pharmacological actions of exogenous compounds (e.g., nicotine and choline). Behavioral studies indicate that nicotine improves such cognitive functions as learning and memory, however the cellular mechanism of these actions remains elusive. With help from newly developed biosensors and optogenetic tools, recent studies provide new insights on signaling mechanisms involved in the activation of nAChRs. Here we will review α7 nAChR's action in the tri-synaptic pathway in the hippocampus. The effects of α7 nAChR activation via either exogenous compounds or endogenous cholinergic innervation are detailed for spontaneous and evoked glutamatergic synaptic transmission and synaptic plasticity, as well as the underlying signaling mechanisms. In summary, α7 nAChRs trigger intracellular calcium rise and calcium-dependent signaling pathways to enhance glutamate release and induce glutamatergic synaptic plasticity.
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Affiliation(s)
- Qing Cheng
- Neurobiology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA
| | - Jerrel L Yakel
- Neurobiology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA
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