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Ahmadi M, Rouhi N, Fathollahi Y, Shojaei A, Rezaei M, Rostami S, Saab BJ, Mirnajafi-Zadeh J. A Dual Effect of Dopamine on Hippocampal LTP and Cognitive Functions in Control and Kindled Mice. J Neurosci 2024; 44:e0926212023. [PMID: 38124004 PMCID: PMC10860576 DOI: 10.1523/jneurosci.0926-21.2023] [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: 05/01/2021] [Revised: 11/02/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023] Open
Abstract
The impact of dopamine on synaptic plasticity and cognitive function following seizure is not well understood. Here, using optogenetics in the freely behaving animal, we examined exploratory behavior and short-term memory in control and kindled male mice during tonic stimulation of dopaminergic neurons within the ventral tegmental area (VTA). Furthermore, using field potential recording, we compared the effect of dopamine on synaptic plasticity in stratum radiatum and stratum oriens layers of both ventral and dorsal hippocampal CA1 regions, and again in both control and kindled male mice. Our results demonstrate that tonic stimulation of VTA dopaminergic neurons enhances novelty-driven exploration and short-term spatial memory in kindled mice, essentially rescuing the seizure-induced cognitive impairment. In addition, we found that dopamine has a dual effect on LTP in control versus kindled mice, such that application of dopamine prevented LTP induction in slices from control mice, but rescued LTP in slices taken from the kindled animal. Taken together, our results highlight the potential for dopaminergic modulation in improving synaptic plasticity and cognitive function following seizure.
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Affiliation(s)
- Mahboubeh Ahmadi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
| | - Nahid Rouhi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
| | - Yaghoub Fathollahi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
| | - Amir Shojaei
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
| | - Mahmoud Rezaei
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
| | - Sareh Rostami
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
| | - Bechara J Saab
- Preclinical Laboratory for Translational Research into Affective Disorders, DPPP, Psychiatric Hospital, University of Zurich, Zurich CH-8008, Switzerland
- Neuroscience Center Zurich, University of Zurich and ETH, Zurich 8057, Switzerland
- Mobio Interactive Pte. Ltd., 389637, Singapore, Republic of Singapore
| | - Javad Mirnajafi-Zadeh
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 1411713116, Iran
- Institute for Brain Sciences and Cognition, Tarbiat Modares University, Tehran 1411713116, Iran
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Aghdash SN, Foroughi G. Chemical Kindling as an Experimental Model to Assess the Conventional Drugs in the Treatment of Post-traumatic Epilepsy. CNS & NEUROLOGICAL DISORDERS DRUG TARGETS 2023; 22:1417-1428. [PMID: 36443981 DOI: 10.2174/1871527322666221128155813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 09/06/2022] [Accepted: 09/09/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Traumatic brain injury (TBI) is one of the leading causes of morbidity and mortality today, which will surpass many infectious diseases in the coming years/decades. Posttraumatic epilepsy (PTE) is one of the most common debilitating consequences of TBI. PTE is a secondary, acquired epilepsy that causes recurrent, spontaneous seizures more than a week after TBI. The extent of head injury in individuals who develop PTE is unknown; however, trauma is thought to account for 20% of symptomatic epilepsy worldwide. Understanding the mechanisms of epilepsy following TBI is crucial for the discovery of new anticonvulsant drugs for the treatment of PTE, as well as for improving the quality of life of patients with PTE. OBJECTIVE This review article explains the rationale for the usage of a chemical model to access new treatments for post-traumatic epilepsy. RESULTS There are multiple methods to control and manage PTE. The essential and available remedy for the management of epilepsy is the use of antiepileptic drugs. Antiepileptic drugs (AEDs) decrease the frequency of seizures without affecting the disease's causality. Antiepileptic drugs are administrated for the prevention and treatment of PTE; however, 30% of epilepsy patients are drug-resistant, and AED side effects are significant in PTE patients. There are different types of animal models, such as the liquid percussion model, intracortical ferric chloride injection, and cortical subincision model, to study PTE and neurophysiological mechanisms underlying the development of epilepsy after head injury. However, these animal models do not easily mimic the pathological events occurring in epilepsy. Therefore, animal models of PTE are an inappropriate tool for screening new and putatively effective AEDs. Chemical kindling is the most common animal model used to study epilepsy. There is a strong similarity between the kindling model and different types of human epilepsy. CONCLUSION Today, researchers use experimental animal models to evaluate new anticonvulsant drugs. The chemical kindling models, such as pentylenetetrazol, bicuculline, and picrotoxin-induced seizures, are important experimental models to analyze the impact of putative antiepileptic drugs.
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Affiliation(s)
- Simin Namvar Aghdash
- Department of Biology, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
| | - Golsa Foroughi
- Department of Biology, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
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Lagard C, Vodovar D, Chevillard L, Callebert J, Caillé F, Pottier G, Liang H, Risède P, Tournier N, Mégarbane B. Investigation of the Mechanisms of Tramadol-Induced Seizures in Overdose in the Rat. Pharmaceuticals (Basel) 2022; 15:ph15101254. [PMID: 36297366 PMCID: PMC9607071 DOI: 10.3390/ph15101254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 10/09/2022] [Accepted: 10/10/2022] [Indexed: 11/16/2022] Open
Abstract
Tramadol overdose is frequently associated with the onset of seizures, usually considered as serotonin syndrome manifestations. Recently, the serotoninergic mechanism of tramadol-attributed seizures has been questioned. This study’s aim was to identify the mechanisms involved in tramadol-induced seizures in overdose in rats. The investigations included (1) the effects of specific pretreatments on tramadol-induced seizure onset and brain monoamine concentrations, (2) the interaction between tramadol and γ-aminobutyric acid (GABA)A receptors in vivo in the brain using positron emission tomography (PET) imaging and 11C-flumazenil. Diazepam abolished tramadol-induced seizures, in contrast to naloxone, cyproheptadine and fexofenadine pretreatments. Despite seizure abolishment, diazepam significantly enhanced tramadol-induced increase in the brain serotonin (p < 0.01), histamine (p < 0.01), dopamine (p < 0.05) and norepinephrine (p < 0.05). No displacement of 11C-flumazenil brain kinetics was observed following tramadol administration in contrast to diazepam, suggesting that the observed interaction was not related to a competitive mechanism between tramadol and flumazenil at the benzodiazepine-binding site. Our findings do not support the involvement of serotoninergic, histaminergic, dopaminergic, norepinephrine or opioidergic pathways in tramadol-induced seizures in overdose, but they strongly suggest a tramadol-induced allosteric change of the benzodiazepine-binding site of GABAA receptors. Management of tramadol-poisoned patients should take into account that tramadol-induced seizures are mainly related to a GABAergic pathway.
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Affiliation(s)
- Camille Lagard
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
| | - Dominique Vodovar
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
- Department of Medical and Toxicological Critical Care, AP-HP, Lariboisière Hospital, 75010 Paris, France
- Imagerie Moléculaire In Vivo, IMIV, CEA, INSERM, CNRS, Universités Paris-Sud et Paris-Saclay, 91471 Orsay, France
| | - Lucie Chevillard
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
| | - Jacques Callebert
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
- Laboratory of Biochemistry and Molecular Biology, AP-HP, Lariboisière Hospital, 75010 Paris, France
| | - Fabien Caillé
- Imagerie Moléculaire In Vivo, IMIV, CEA, INSERM, CNRS, Universités Paris-Sud et Paris-Saclay, 91471 Orsay, France
| | - Géraldine Pottier
- Imagerie Moléculaire In Vivo, IMIV, CEA, INSERM, CNRS, Universités Paris-Sud et Paris-Saclay, 91471 Orsay, France
| | - Hao Liang
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
| | - Patricia Risède
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
| | - Nicolas Tournier
- Imagerie Moléculaire In Vivo, IMIV, CEA, INSERM, CNRS, Universités Paris-Sud et Paris-Saclay, 91471 Orsay, France
| | - Bruno Mégarbane
- Inserm, UMRS-1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université Paris Cité, F-75006 Paris, France
- Department of Medical and Toxicological Critical Care, AP-HP, Lariboisière Hospital, 75010 Paris, France
- Correspondence: ; Tel.: +33-149-958-961; Fax: +33-149-956-578
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Alachkar A, Ojha SK, Sadeq A, Adem A, Frank A, Stark H, Sadek B. Experimental Models for the Discovery of Novel Anticonvulsant Drugs: Focus on Pentylenetetrazole-Induced Seizures and Associated Memory Deficits. Curr Pharm Des 2020; 26:1693-1711. [PMID: 32003682 DOI: 10.2174/1381612826666200131105324] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 12/30/2019] [Indexed: 02/07/2023]
Abstract
Epilepsy is a chronic neurological disorder characterized by irregular, excessive neuronal excitability, and recurrent seizures that affect millions of patients worldwide. Currently, accessible antiepileptic drugs (AEDs) do not adequately support all epilepsy patients, with around 30% patients not responding to the existing therapies. As lifelong epilepsy treatment is essential, the search for new and more effective AEDs with an enhanced safety profile is a significant therapeutic goal. Seizures are a combination of electrical and behavioral events that can induce biochemical, molecular, and anatomic changes. Therefore, appropriate animal models are required to evaluate novel potential AEDs. Among the large number of available animal models of seizures, the acute pentylenetetrazole (PTZ)-induced myoclonic seizure model is the most widely used model assessing the anticonvulsant effect of prospective AEDs, whereas chronic PTZ-kindled seizure models represent chronic models in which the repeated administration of PTZ at subconvulsive doses leads to the intensification of seizure activity or enhanced seizure susceptibility similar to that in human epilepsy. In this review, we summarized the memory deficits accompanying acute or chronic PTZ seizure models and how these deficits were evaluated applying several behavioral animal models. Furthermore, major advantages and limitations of the PTZ seizure models in the discovery of new AEDs were highlighted. With a focus on PTZ seizures, the major biochemicals, as well as morphological alterations and the modulated brain neurotransmitter levels associated with memory deficits have been illustrated. Moreover, numerous medicinal compounds with concurrent anticonvulsant, procognitive, antioxidant effects, modulating effects on several brain neurotransmitters in rodents, and several newly developed classes of compounds applying computer-aided drug design (CADD) have been under development as potential AEDs. The article details the in-silico approach following CADD, which can be utilized for generating libraries of novel compounds for AED discovery. Additionally, in vivo studies could be useful in demonstrating efficacy, safety, and novel mode of action of AEDs for further clinical development.
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Affiliation(s)
- Alaa Alachkar
- Department of Pharmacology & Therapeutics, College of Medicine & Health Sciences, United Arab Emirates University, P.O. Box 17666 Al Ain, United States.,Zayed Centre for Health Sciences, United Arab Emirates University, Al Ain, United States
| | - Shreesh K Ojha
- Department of Pharmacology & Therapeutics, College of Medicine & Health Sciences, United Arab Emirates University, P.O. Box 17666 Al Ain, United States.,Zayed Centre for Health Sciences, United Arab Emirates University, Al Ain, United States
| | - Adel Sadeq
- College of Pharmacy, Al Ain University, Al Ain, United Arab Emirates
| | - Abdu Adem
- Department of Pharmacology & Therapeutics, College of Medicine & Health Sciences, United Arab Emirates University, P.O. Box 17666 Al Ain, United States.,Zayed Centre for Health Sciences, United Arab Emirates University, Al Ain, United States
| | - Annika Frank
- Institute of Pharmaceutical and Medicinal Chemistry, Heinrich Heine University Düsseldorf, Universitaetsstr. 1, 40225 Düsseldorf, Germany
| | - Holger Stark
- Institute of Pharmaceutical and Medicinal Chemistry, Heinrich Heine University Düsseldorf, Universitaetsstr. 1, 40225 Düsseldorf, Germany
| | - Bassem Sadek
- Department of Pharmacology & Therapeutics, College of Medicine & Health Sciences, United Arab Emirates University, P.O. Box 17666 Al Ain, United States.,Zayed Centre for Health Sciences, United Arab Emirates University, Al Ain, United States
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Khalifeh S, Khodamoradi M, Hajali V, Ghazvini H, Eliasy L, Kheradmand A, Farnia V, Akhtari J, Shahveisi K, Ghalehnoei H. Naloxone Ameliorates Spatial Memory Deficits and Hyperthermia Induced by a Neurotoxic Methamphetamine Regimen in Male Rats. Galen Med J 2019; 8:e1182. [PMID: 34466469 PMCID: PMC8343598 DOI: 10.31661/gmj.v0i0.1182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 08/13/2018] [Accepted: 09/03/2018] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Methamphetamine (METH) as a synthetic psychostimulant is being increasingly recognized as a worldwide problem, which may induce memory impairment. On the other hand, it is well established that naloxone, an opiate antagonist, has some beneficial effects on learning and memory. The present research aimed at evaluating naloxone effects on spatial learning and memory impairment triggered by a neurotoxic regimen of METH in male rats. MATERIALS AND METHODS The animals received the subcutaneous (sc) regimen of METH (4×6 mg/kg at 2-h intervals), intraperitoneal (ip) naloxone (4×1 mg/kg at 2-h intervals), or normal saline at four events. The Nal-METH group of rats received four naloxone injections (1 mg/ kg, ip) 30 min before each METH injection (6 mg/kg, sc) at 2-h intervals. Seven days later, they were evaluated for spatial learning and memory in the Morris Water Maze (MWM) task. RESULTS METH regimen induced hyperthermia, as well as a poor performance, in the acquisition and retention phases of the task, indicating spatial learning and memory impairment compared to the controls. Naloxone administration (1 mg/kg, ip) before each METH injection led to significant attenuations of both hyperthermia and METH adverse effects on the rat performance in the MWM task. CONCLUSION The results revealed that pretreatment with the opiate antagonist naloxone could prevent METH adverse effects on body temperature and memory performance. It seems that the opioidergic system and hyperthermia may, at least partially, be involved in METH effects on spatial memory.
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Affiliation(s)
- Solmaz Khalifeh
- Cognitive and Neuroscience Research Center (CNRC), Amiralmomenin Hospital, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Mehdi Khodamoradi
- Substance Abuse Prevention Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Vahid Hajali
- Quchan Higher Health Education Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hamed Ghazvini
- Psychiatry and Behavioral Sciences Research Center, Addiction Institute, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran
- Molecular and Cell Biology Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Lelia Eliasy
- Department of Anatomical Sciences, Golestan University of Medical Sciences, Golestan, Iran
| | - Afshin Kheradmand
- Department of Pharmacology and Toxicology, school of pharmacy, International campus, Iran University of medical sciences, Tehran, Iran
| | - Vahid Farnia
- Substance Abuse Prevention Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Javad Akhtari
- Immunogenetic Research Center, Mazandaran University of medical science, Sari, Iran
| | - Kaveh Shahveisi
- Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Hossein Ghalehnoei
- Molecular and Cell Biology Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
- Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
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Lagard C, Malissin I, Indja W, Risède P, Chevillard L, Mégarbane B. Is naloxone the best antidote to reverse tramadol-induced neuro-respiratory toxicity in overdose? An experimental investigation in the rat. Clin Toxicol (Phila) 2017; 56:737-743. [PMID: 29148295 DOI: 10.1080/15563650.2017.1401080] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
CONTEXT Since the banning of dextropropoxyphene from the market, overdoses, and fatalities attributed to tramadol, a WHO step-2 opioid analgesic, have increased markedly. Tramadol overdose results not only in central nervous system (CNS) depression attributed to its opioid properties but also in seizures, possibly related to non-opioidergic pathways, thus questioning the efficiency of naloxone to reverse tramadol-induced CNS toxicity. OBJECTIVE To investigate the most efficient antidote to reverse tramadol-induced seizures and respiratory depression in overdose. MATERIALS AND METHODS Sprague-Dawley rats overdosed with 75 mg/kg intraperitoneal (IP) tramadol were randomized into four groups to receive solvent (control group), diazepam (1.77 mg/kg IP), naloxone (2 mg/kg intravenous bolus followed by 4 mg/kg/h infusion), and diazepam/naloxone combination. Sedation depth, temperature, number of seizures, and intensity, whole-body plethysmography parameters and electroencephalography activity were measured. RESULTS Naloxone reversed tramadol-induced respiratory depression (p < .05) but significantly increased seizures (p < .01) and prolonged their occurrence time. Diazepam abolished seizures but significantly deepened rat sedation (p < .05) without improving ventilation. Diazepam/naloxone combination completely abolished seizures, significantly improved rat ventilation by reducing inspiratory time (p < .05) but did not worsen sedation. None of these treatments significantly modified rat temperature. CONCLUSIONS Diazepam/naloxone combination is the most efficient antidote to reverse tramadol-induced CNS toxicity in the rat.
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Affiliation(s)
- Camille Lagard
- a Inserm UMR-S 1144, Paris-Descartes and Paris-Diderot Universities , Paris , France
| | - Isabelle Malissin
- b Department of Medical and Toxicological Critical Care , Lariboisière Hospital , Paris , France
| | - Wassila Indja
- a Inserm UMR-S 1144, Paris-Descartes and Paris-Diderot Universities , Paris , France
| | - Patricia Risède
- a Inserm UMR-S 1144, Paris-Descartes and Paris-Diderot Universities , Paris , France
| | - Lucie Chevillard
- a Inserm UMR-S 1144, Paris-Descartes and Paris-Diderot Universities , Paris , France
| | - Bruno Mégarbane
- a Inserm UMR-S 1144, Paris-Descartes and Paris-Diderot Universities , Paris , France.,b Department of Medical and Toxicological Critical Care , Lariboisière Hospital , Paris , France
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Zhao X, Zhang RX, Tang S, Ren YY, Yang WX, Liu XM, Tang JY. Orexin-A-induced ERK1/2 activation reverses impaired spatial learning and memory in pentylenetetrazol-kindled rats via OX1R-mediated hippocampal neurogenesis. Peptides 2014; 54:140-7. [PMID: 24321199 DOI: 10.1016/j.peptides.2013.11.019] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Revised: 11/15/2013] [Accepted: 11/15/2013] [Indexed: 01/07/2023]
Abstract
Epilepsy is characterized by the occurrence of repetitive seizures and can greatly affect a patient's cognition, particularly in terms of learning and memory. Orexin-A is an excitatory neuropeptide produced by the lateral hypothalamus that has been shown to be involved in learning and memory. A reduction in the levels of orexin-A after seizures may underlie the learning and memory impairments induced by epilepsy. Thus, we used pentylenetetrazol (PTZ)-kindled rats to investigate the effects of orexin-A on learning and memory and the involvement of neurogenesis in the dentate gyrus in OX1R-mediated ERK1/2 activation. A Morris water maze test revealed reduced escape latencies, prolonged times in the target quadrant and an increased number of platform crossings in PTZ-kindled rats exposed to orexin-A. These ameliorating effects of orexin-A on spatial learning and memory were attenuated by the intracerebroventricular injection of the OX1R antagonist SB334867 or the ERK1/2 inhibitor U0126. Further studies using bromodeoxyuridine (BrdU) revealed that orexin-A increased the number of BrdU-positive cells, doublecortin (DCX)/BrdU levels and the number of NeuN/BrdU double-positive nuclei in the dentate gyrus of PTZ-kindled rats. However, these effects were inhibited by treatment with SB334867 or U0126. Taken together, these data suggest that orexin-A attenuated the impairment of spatial learning and memory in PTZ-kindled rats and that this attenuation involved neurogenesis in the dentate gyrus via OX1R-mediated ERK1/2 activation.
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Affiliation(s)
- Xuan Zhao
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China
| | - Rui xue Zhang
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China
| | - Shi Tang
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China
| | - Yan yan Ren
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China
| | - Wei xia Yang
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China
| | - Xiao min Liu
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China
| | - Ji you Tang
- Department of Neurology, Qianfoshan Hospital, Shandong University, 16766 Jingshi Road, Jinan, Shandong 250014, PR China.
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Guedes RCA, Rocha-de-Melo AP, de Lima KR, de Albuquerque JDMS, Francisco EDS. Early malnutrition attenuates the impairing action of naloxone on spreading depression in young rats. Nutr Neurosci 2013; 16:142-6. [DOI: 10.1179/1476830512y.0000000046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Aniol VA, Ivanova-Dyatlova AY, Keren O, Guekht AB, Sarne Y, Gulyaeva NV. A single pentylenetetrazole-induced clonic-tonic seizure episode is accompanied by a slowly developing cognitive decline in rats. Epilepsy Behav 2013; 26:196-202. [PMID: 23318024 DOI: 10.1016/j.yebeh.2012.12.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 11/04/2012] [Accepted: 12/08/2012] [Indexed: 12/13/2022]
Abstract
According to different studies, between 5% and 10% of people suffer a single isolated seizure episode at some time in their life. However, little is known about the effects of a single seizure episode on cognitive function, and clinical investigations of this issue are not easy to perform. In this situation, animal models may be a reasonable choice. The aim of our study was to follow the time course of delayed effects of generalized clonic-tonic convulsions on learning and memory functions in rats. A clonic-tonic seizure episode was induced by a single i.p. injection of pentylenetetrazole (70 mg/kg). Different behavioral tests were performed between days 10 and 100 after the convulsant administration. A single seizure episode resulted in a gradual decline in short-term memory function as assessed by novel object recognition and social recognition tests. The seizure episode induced a quick increase in hippocampal cell proliferation; however, the excessive newly generated cells seemed to be eliminated by the time of obvious cognitive impairment. These observations are indicative of a slowly developing and long-lasting influence of a single seizure episode on cognitive function. A rather long time period between the seizure episode and the manifestations of cognitive decline provides a window for a possible therapeutic intervention, and an elaboration of such "post-conditioning" treatments may be a promising opportunity to prevent subsequent mental impairments in patients.
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Affiliation(s)
- Victor A Aniol
- Department of Functional Biochemistry of the Nervous System, Institute of Higher Nervous Activity and Neurophysiology, RAS, Butlerov Street 5A, Moscow 117485, Russia
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Astrocyte- neuron interaction as a mechanism responsible for generation of neural synchrony: a study based on modeling and experiments. J Comput Neurosci 2012; 34:489-504. [DOI: 10.1007/s10827-012-0432-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 09/29/2012] [Accepted: 10/11/2012] [Indexed: 10/27/2022]
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Effect of medroxyprogesterone on development of pentylenetetrazole-induced kindling in mice. Neuroscience 2012; 207:283-7. [DOI: 10.1016/j.neuroscience.2012.01.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Revised: 01/13/2012] [Accepted: 01/14/2012] [Indexed: 11/21/2022]
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Singh P, Mohammad F, Sharma A. Transcriptomic analysis in a Drosophila model identifies previously implicated and novel pathways in the therapeutic mechanism in neuropsychiatric disorders. Front Neurosci 2011; 5:161. [PMID: 21503142 PMCID: PMC3071501 DOI: 10.3389/fnins.2011.00161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Accepted: 02/23/2011] [Indexed: 12/19/2022] Open
Abstract
We have taken advantage of a newly described Drosophila model to gain insights into the potential mechanism of antiepileptic drugs (AEDs), a group of drugs that are widely used in the treatment of several neurological and psychiatric conditions besides epilepsy. In the recently described Drosophila model that is inspired by pentylenetetrazole (PTZ) induced kindling epileptogenesis in rodents, chronic PTZ treatment for 7 days causes a decreased climbing speed and an altered CNS transcriptome, with the latter mimicking gene expression alterations reported in epileptogenesis. In the model, an increased climbing speed is further observed 7 days after withdrawal from chronic PTZ. We used this post-PTZ withdrawal regime to identify potential AED mechanism. In this regime, treatment with each of the five AEDs tested, namely, ethosuximide, gabapentin, vigabatrin, sodium valproate, and levetiracetam, resulted in rescuing of the altered climbing behavior. The AEDs also normalized PTZ withdrawal induced transcriptomic perturbation in fly heads; whereas AED untreated flies showed a large number of up- and down-regulated genes which were enriched in several processes including gene expression and cell communication, the AED treated flies showed differential expression of only a small number of genes that did not enrich gene expression and cell communication processes. Gene expression and cell communication related upregulated genes in AED untreated flies overrepresented several pathways – spliceosome, RNA degradation, and ribosome in the former category, and inositol phosphate metabolism, phosphatidylinositol signaling, endocytosis, and hedgehog signaling in the latter. Transcriptome remodeling effect of AEDs was overall confirmed by microarray clustering that clearly separated the profiles of AED treated and untreated flies. Besides being consistent with previously implicated pathways, our results provide evidence for a role of other pathways in psychiatric drug mechanism. Overall, we provide an amenable model to understand neuropsychiatric mechanism in cellular and molecular terms.
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Affiliation(s)
- Priyanka Singh
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi University Campus Delhi, India
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Effect of prenatal pentylenetetrazol-induced kindling on learning and memory of male offspring. Neuroscience 2011; 172:205-11. [DOI: 10.1016/j.neuroscience.2010.11.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 11/01/2010] [Accepted: 11/02/2010] [Indexed: 11/18/2022]
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Uhelski ML, Fuchs PN. Naltrexone fails to increase pain affect in response to inflammatory pain in a novel escape/avoidance paradigm. Physiol Behav 2009; 98:263-7. [PMID: 19505486 DOI: 10.1016/j.physbeh.2009.05.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 04/10/2009] [Accepted: 05/26/2009] [Indexed: 11/30/2022]
Abstract
The non-specific opioid antagonist naltrexone has traditionally been used as treatment for opioid overdose, as well as in research settings as an antagonist to examine opioid and non-opioid mediated analgesia. However, the mechanisms by which this drug operates are not well understood, and its exact effects on sensory and affective pain processes remain uncertain. Various studies have demonstrated that naltrexone behaves in a paradoxical manner, leading to analgesia, no discernable changes, or an increase in pain, depending on the circumstances of the study. This imprecise spectrum of effects leads to difficulty in interpreting results in studies where naltrexone was utilized as an antagonist. Therefore, the purpose of this experiment was to further examine whether naltrexone elicits dose-dependent effects in behavioral tests designed to quantify the sensory and affective components of pain. Naltrexone was not expected to have an effect on carrageenan-induced inflammatory pain in sensory pain measures, but a dose-dependent increase was predicted in behavior related to the affective component of pain. Eighty-eight male Sprague-Dawley rats were used to test these hypotheses by measuring Mechanical Paw Withdrawal Thresholds before and after naltrexone injection and by assessing performance in the Place Escape Avoidance Paradigm test, a novel paradigm to test pain affect, in which naltrexone had not been utilized. The results demonstrated that naltrexone failed to increase place/escape avoidance behavior as anticipated, but rather produced a slight, but non-significant, decrease in escape avoidance behavior. Further research is needed to elucidate the differential effects of naltrexone on various aspects of pain-related behavior.
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Affiliation(s)
- Megan L Uhelski
- University of Texas at Arlington, Department of Psychology, Box 19528, Arlington, TX 76019, United States
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Kim Y, Lee Y, Lee H, Jung MW, Lee C. Impaired avoidance learning and increased hsp70 mRNA expression in pentylenetetrazol‐treated zebrafish. Anim Cells Syst (Seoul) 2009. [DOI: 10.1080/19768354.2009.9647219] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Abstract
This paper is the thirtieth consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2007 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior, and the roles of these opioid peptides and receptors in pain and analgesia; stress and social status; tolerance and dependence; learning and memory; eating and drinking; alcohol and drugs of abuse; sexual activity and hormones, pregnancy, development and endocrinology; mental illness and mood; seizures and neurologic disorders; electrical-related activity and neurophysiology; general activity and locomotion; gastrointestinal, renal and hepatic functions; cardiovascular responses; respiration and thermoregulation; and immunological responses.
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, 65-30 Kissena Blvd.,Flushing, NY 11367, United States.
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Rocha-de-Melo AP, de Lima KR, de Albuquerque JDMS, de Oliveira AKP, Guedes RCA. Chronic neonatal exposure of rats to the opioid antagonist naloxone impairs propagation of cortical spreading depression in adulthood. Neurosci Lett 2008; 441:315-8. [DOI: 10.1016/j.neulet.2008.06.057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 06/17/2008] [Accepted: 06/23/2008] [Indexed: 11/29/2022]
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