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Bolouri-Roudsari A, Baghani M, Askari K, Mazaheri S, Haghparast A. The integrative role of orexin-1 and orexin-2 receptors within the hippocampal dentate gyrus in the modulation of the stress-induced antinociception in the formalin pain test in the rat. Behav Pharmacol 2024; 35:14-25. [PMID: 37578388 DOI: 10.1097/fbp.0000000000000737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
The stressful experiences, by triggering a cascade of hormonal and neural changes, can produce antinociception commonly referred to as stress-induced antinociception (SIA). Orexin neuropeptides have an essential role in stress responses and pain modulation. The dentate gyrus receives orexinergic projections and has been shown to be involved in pain processing. The current study investigated the possible role of orexin-1 and orexin-2 receptors (OX1r and OX2r, respectively) within the dentate gyrus in SIA in a rat model of formalin-induced pain behavior in one hind paw. Male Wistar rats weighing 230-250 g underwent stereotaxic surgery and a cannula was implanted in their brains, above the dentate gyrus region. Either SB334867 or TCS OX2 29 (OX1r and OX2r antagonists, respectively) was microinjected into the dentate gyrus region at a range of doses at 1, 3, 10, and 30 nmol (control group received DMSO 12% as vehicle), 5 min before the forced swim stress (FSS) exposure. The formalin test was performed to assess pain-related behaviors. The results indicated that FSS exposure relieves pain-related behavior in the early and late phases of the formalin test. Blockade of intra-dentate gyrus OX1 or OX2 receptors reduced the antinociceptive responses induced by FSS in the formalin test, with more impact during the late phase. Our findings support the potential role of intra-dentate gyrus orexin receptors as target sites of orexin neurons in painful and stressful situations. Therefore, understanding the exact mechanisms of SIA and the role of the orexinergic system in this phenomenon can lead to identifying the strategies to guide future research and offer a new approach to discovering new pain therapeutic agents.
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Affiliation(s)
- Arad Bolouri-Roudsari
- Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences
- Department of Physiology, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University
| | - Matin Baghani
- Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences
- Department of Physiology, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University
| | | | - Sajad Mazaheri
- Neurophysiology Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abbas Haghparast
- Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences
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Dezfouli RA, Mazaheri S, Mousavi Z, Haghparast A. Restraint stress induced the antinociceptive responses via the dopamine receptors within the hippocampal CA1 area in animal model of persistent inflammatory pain. Behav Brain Res 2023; 443:114307. [PMID: 36764008 DOI: 10.1016/j.bbr.2023.114307] [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: 11/19/2022] [Revised: 01/09/2023] [Accepted: 01/21/2023] [Indexed: 02/11/2023]
Abstract
It has been declared that dopamine receptors within the hippocampal formation are involved in emotion, memory, and pain processing. Remarkably, both CA1 and dentate gyrus (DG) areas of the hippocampal formation are involved in persistent peripheral nociceptive perception. A prior study showed that dopamine receptors within the hippocampal DG have a critical role in antinociception induced by forced swim stress (FSS), as a physical stressor, in the presence of formalin irritation. The present experiments were designed to assess whether dopaminergic receptors within the CA1 have any role in antinociceptive responses induced by restraint stress (RS) as a psychological stressor after applying the formalin test as an animal model of persistent inflammatory pain. The D1- and D2-like dopamine receptor antagonists, SCH23390 and Sulpiride (0.25, 1, and 4 μg/0.5 μl), were injected into the CA1 areas of ninety-six male albino Wistar rats 5 min before a 3-h period of restraint stress. Ten min after stress termination, a 50-μl formalin 2.5 % was subcutaneously injected into the plantar surface of the rat's hind paw to induce persistent inflammatory pain. Nociceptive behaviors in both phases of the formalin test were analyzed in the 5-min blocks for a 60-min period. The obtained results demonstrate that although RS could induce an antinociceptive response in both phases of the formalin test, microinjection of D1- and D2-like dopamine receptors, antagonists attenuated RS-induced analgesia. These results support the hypothesis that acute restraint stress could induce analgesia via dopaminergic projection to the CA1 region of the hippocampal formation.
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Affiliation(s)
- Ramin Abdi Dezfouli
- Pharmacology and Toxicology Department, Faculty of Pharmacy and Pharmaceutical Sciences, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Sajad Mazaheri
- Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Zahra Mousavi
- Pharmacology and Toxicology Department, Faculty of Pharmacy and Pharmaceutical Sciences, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Abbas Haghparast
- Neuroscience Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; School of Cognitive Sciences, Institute for Research in Fundamental Sciences, Tehran, Iran; Department of Basic Sciences, Iranian Academy of Medical Sciences, Tehran, Iran.
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Effects of Ozone on Hippocampus BDNF and Fos Expressions in Rats with Chronic Compression of Dorsal Root Ganglia. BIOMED RESEARCH INTERNATIONAL 2021; 2021:5572915. [PMID: 34869766 PMCID: PMC8642004 DOI: 10.1155/2021/5572915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 10/26/2021] [Indexed: 11/30/2022]
Abstract
The effects of ozone on hippocampal expression levels of brain-derived neurotrophic factor (BDNF) and c-fos protein (Fos) were evaluated in rats with chronic compression of dorsal root ganglia (CCD). Forty-eight adult female Sprague-Dawley rats were randomly divided into the following 4 groups (n = 12): sham operation (sham group), CCD group, CCD with 20 μg/ml of ozone (CCD + AO3 group), and CCD with 40 μg/ml of ozone (CCD + BO3 group). Except the sham group, unilateral L5 dorsal root ganglion (DRG) compression was performed on all other groups. On days 1, 2, and 4 after the operation, the CCD + AO3 and CCD + BO3 groups were injected with 100 μl of ozone with concentrations of 20 and 40 μg/ml, respectively. Thermal withdrawal latencies (TWLs) and mechanical withdrawal thresholds (MWTs) were measured at various time points before and after the operation. BDNF and Fos expressions were examined in the extracted hippocampi using immunohistochemistry. The TWLs and MWTs of CCD model rats that received ozone were lower with decreased BDNF and increased Fos expression levels, on day 21 after the operation, compared to those of the sham group (P < 0.05). The TWLs and MWTs of the CCD + AO3 and CCD + BO3 groups were higher with increased BDNF and decreased Fos expression levels, on day 21 after the operation, compared to those of the CCD group (P < 0.05). The TWLs were longer and the MWTs were higher in the CCD + BO3 group at each time point with increased BDNF and decreased Fos expression levels, on day 21 after the operation, compared to those of the CCD + AO3 group (P < 0.05). Our results revealed that ozone can relieve the neuropathic pain caused by the pathological neuralgia resulting from DRG compression in rats. The mechanism of action for ozone is likely associated with changes in BDNF and Fos expression levels in the hippocampus.
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Luo X, He T, Wang Y, Wang JL, Yan XB, Zhou HC, Wang RR, Du R, Wang XL, Chen J, Huang D. Ceftriaxone Relieves Trigeminal Neuropathic Pain Through Suppression of Spatiotemporal Synaptic Plasticity via Restoration of Glutamate Transporter 1 in the Medullary Dorsal Horn. Front Cell Neurosci 2020; 14:199. [PMID: 32714151 PMCID: PMC7340123 DOI: 10.3389/fncel.2020.00199] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 06/08/2020] [Indexed: 12/21/2022] Open
Abstract
Using a rat model of trigeminal neuropathic pain (TNP) produced by chronic compression of the infraorbital nerve (CCI-ION), we investigated the analgesic effect and the underlying mechanisms of ceftriaxone (Cef), a β-lactam antibiotic, that is thought to be a potent stimulator of glutamate transporter 1 (GLT-1). First, repeated intraperitoneal (i.p.) injections of Cef (200 mg/kg) for 5-days since Day 1 of CCI-ION could significantly relieve both mechanical and thermal pain hypersensitivity from day 10 after drug administration. Western blot and immunofluorescent results demonstrated that 5-days administration of Cef resulted in the restoration of GLT-1 expression to a level equivalent to the sham control which was dramatically lost under the TNP condition. Moreover, multi-electrode (8 × 8) array recordings of network field excitatory postsynaptic potentials (fEPSPs) were performed on the acutely dissociated medullary dorsal horn slice evoked by electrical stimulation of the trigeminal spinal tract. The results showed that the increased number of fEPSPs, induction rate, and maintenance of long-term potentiation caused by CCI-ION were significantly suppressed by 5-days administration of Cef. Taken together, the results indicate that Cef can relieve TNP through suppression of spatiotemporal synaptic plasticity via GLT-1 restoration in the medullary dorsal horn of the trigeminal nerve.
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Affiliation(s)
- Xiao Luo
- Department of Pain Management, The Third Xiangya Hospital, Institute of Pain Medicine, Central South University, Changsha, China
| | - Ting He
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.,Key Laboratory of Brain Stress and Behavior, People's Liberation Army, Xi'an, China
| | - Yan Wang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.,Key Laboratory of Brain Stress and Behavior, People's Liberation Army, Xi'an, China
| | - Jiang-Lin Wang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.,Department of Pain Management, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Xue-Bin Yan
- Department of Pain Management, The Third Xiangya Hospital, Institute of Pain Medicine, Central South University, Changsha, China
| | - Hao-Cheng Zhou
- Department of Pain Management, The Third Xiangya Hospital, Institute of Pain Medicine, Central South University, Changsha, China
| | - Rui-Rui Wang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.,Key Laboratory of Brain Stress and Behavior, People's Liberation Army, Xi'an, China
| | - Rui Du
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
| | - Xiao-Liang Wang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.,Key Laboratory of Brain Stress and Behavior, People's Liberation Army, Xi'an, China
| | - Jun Chen
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.,Key Laboratory of Brain Stress and Behavior, People's Liberation Army, Xi'an, China
| | - Dong Huang
- Department of Pain Management, The Third Xiangya Hospital, Institute of Pain Medicine, Central South University, Changsha, China
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Medeiros P, de Freitas RL, Boccella S, Iannotta M, Belardo C, Mazzitelli M, Romano R, De Gregorio D, Coimbra NC, Palazzo E, Maione S. Characterization of the sensory, affective, cognitive, biochemical, and neuronal alterations in a modified chronic constriction injury model of neuropathic pain in mice. J Neurosci Res 2019; 98:338-352. [PMID: 31396990 DOI: 10.1002/jnr.24501] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/24/2019] [Accepted: 07/08/2019] [Indexed: 12/12/2022]
Abstract
The chronic constriction injury (CCI) of the sciatic nerve is a nerve injury-based model of neuropathic pain (NP). Comorbidities of NP such as depression, anxiety, and cognitive deficits are associated with a functional reorganization of the medial prefrontal cortex (mPFC). Here, we have employed an adapted model of CCI by placing one single loose ligature around the sciatic nerve in mice for investigating the alterations in sensory, motor, affective, and cognitive behavior and in electrophysiological and biochemical properties in the prelimbic division (PrL) of the mPFC. Our adapted model of CCI induced mechanical allodynia, motor, and cognitive impairments and anxiety- and depression-like behavior. In the PrL division of mPFC was observed an increase in GABA and a decrease in d-aspartate levels. Moreover an increase in the activity of neurons responding to mechanical stimulation with an excitation, mPFC (+), and a decrease in those responding with an inhibition, mPFC (-), was found. Altogether these findings demonstrate that a single ligature around the sciatic nerve was able to induce sensory, affective, cognitive, biochemical, and functional alterations already observed in other neuropathic pain models and it may be an appropriate and easily reproducible model for studying neuropathic pain mechanisms and treatments.
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Affiliation(s)
- Priscila Medeiros
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy.,Laboratory of Neurosciences of Pain & Emotions and Multi-User Centre of Neuroelectrophysiology, Department of Surgery and Anatomy, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), Ribeirão Preto (SP), Brazil.,Laboratory of Neuroanatomy and Neuropsychobiology, Department of Pharmacology, FMRP-USP, Ribeirão Preto, Brazil.,Behavioural Neurosciences Institute (INeC), Ribeirão Preto, Brazil
| | - Renato Leonardo de Freitas
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy.,Laboratory of Neurosciences of Pain & Emotions and Multi-User Centre of Neuroelectrophysiology, Department of Surgery and Anatomy, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), Ribeirão Preto (SP), Brazil.,Laboratory of Neuroanatomy and Neuropsychobiology, Department of Pharmacology, FMRP-USP, Ribeirão Preto, Brazil.,Behavioural Neurosciences Institute (INeC), Ribeirão Preto, Brazil.,Biomedical Sciences Institute, Federal University of Alfenas (UNIFAL), Alfenas (MG), Brazil
| | - Serena Boccella
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Monica Iannotta
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Carmela Belardo
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Mariacristina Mazzitelli
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Rosaria Romano
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Danilo De Gregorio
- Neurobiological Psychiatry Unit, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Norberto Cysne Coimbra
- Laboratory of Neurosciences of Pain & Emotions and Multi-User Centre of Neuroelectrophysiology, Department of Surgery and Anatomy, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), Ribeirão Preto (SP), Brazil.,Laboratory of Neuroanatomy and Neuropsychobiology, Department of Pharmacology, FMRP-USP, Ribeirão Preto, Brazil.,Behavioural Neurosciences Institute (INeC), Ribeirão Preto, Brazil
| | - Enza Palazzo
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Sabatino Maione
- Division of Pharmacology, Department of Experimental Medicine, Università degli Studi della Campania Luigi Vanvitelli, Naples, Italy
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Zhang YN, Huo JW, Huang YR, Hao Y, Chen ZY. Altered amplitude of low-frequency fluctuation and regional cerebral blood flow in females with primary dysmenorrhea: a resting-state fMRI and arterial spin labeling study. J Pain Res 2019; 12:1243-1250. [PMID: 31114306 PMCID: PMC6489567 DOI: 10.2147/jpr.s177502] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 02/14/2019] [Indexed: 12/12/2022] Open
Abstract
Purpose: The current study aimed to explore the central mechanism of primary dysmenorrhea (PD) by investigating the alterations in resting state amplitude of low-frequency fluctuation (ALFF) and regional cerebral blood flow (CBF) between PD patients and healthy controls (HCs). Patients and methods: A total of 34 female subjects including 20 PD patients and 14 HCs underwent resting-state functional magnetic resonance imaging (rs-fMRI) and arterial spin labeling technique (ASL) MRI during menstrual phase. Subsequently, the differences in ALFF and CBF were compared in the two groups. The visual analog scores for pain (VAS-P) and for anxiety (VAS-A) were applied to assess cramping pain and related symptoms in PD patients. Finally, Pearson's correlation analysis was performed to analyze relationships between the neuroimaging findings and clinical characteristics. Results: Compared to HCs, PD patients had decreased ALFF in the right cerebellum posterior lobe, right middle temporal gyrus, right parahippocampal gyrus, right hippocampus, right brainstem and left parietal lobe. In addition, elevated CBF values were observed in the right inferior frontal gyrus, right precentral gyrus, and right superior temporal gyrus. There was no significant correlation between ALFF, CBF values and clinical characteristics including onset age of dysmenorrhea, VAS-A, and VAS-P in PD patients. Conclusion: The preliminary alterations of ALFF and CBF values in PD patients were observed in different pain-related brain regions, which were involved in multiple dimensions of pain and pain modulation. The combination of rs-fMRI and ASL MRI might provide complementary information for a better understanding of the central mechanism in PD.
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Affiliation(s)
- Ya-Nan Zhang
- Department of Radiology, Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University, Beijing 100010, People's Republic of China
| | - Jian-Wei Huo
- Department of Radiology, Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University, Beijing 100010, People's Republic of China
| | - Yi-Ran Huang
- School of Acupuncture-Moxibustion & Tuina, Beijing University of Chinese Medicine, Beijing, 100029, People's Republic of China
| | - Ying Hao
- Beijing International Center for Mathematical Research, Peking University, Beijing 100871, People's Republic of China
| | - Zi-Yue Chen
- Department of Acupuncture and Moxibustion, Yanshan Hospital, Beijing 102500, People's Republic of China
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Miladinovic T, Sharma M, Phan A, Geres H, Ungard RG, Linher-Melville K, Singh G. Activation of hippocampal microglia in a murine model of cancer-induced pain. J Pain Res 2019; 12:1003-1016. [PMID: 30936739 PMCID: PMC6430067 DOI: 10.2147/jpr.s191860] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Introduction Pain is a common and debilitating comorbidity of metastatic breast cancer. The hippocampus has been implicated in nociceptive processing, particularly relating to the subjective aspect of pain. Here, a syngeneic mouse model was used to characterize the effects of peripheral tumors on hippocampal microglial activation in relation to cancer-induced pain (CIP). Materials and methods Mice were systemically treated with the colony-stimulating factor 1 receptor inhibitor Pexidartinib prior to intrafemoral (IF) or subcutaneous 4T1 carcinoma cell inoculation. Spontaneous and evoked nociceptive responses were quantitated throughout tumor development, and contralateral hippocampi were collected via endpoint microdissection for RNA analysis. Additionally, IF tumor-bearing animals were sacrificed on days 5, 10, 15, and 20 post 4T1 cell inoculation, and brain sections were immunofluorescently stained for Iba1, a marker of activated microglia. Results Ablation of these neuroimmune cells with the CSF1R inhibitor Pexidartinib delayed the onset and severity of cancer-induced nociceptive behaviors in IF tumor-bearing animals, adding to the body of literature that demonstrates microglial contribution to the development and maintenance of CIP. Furthermore, in untreated IF tumor-bearing mice, nociceptive behaviors appeared to progress in parallel with microglial activation in hippocampal regions. Immunofluorescent Iba1+ microglia increased in the dentate gyrus and cornu ammonis 1 hippocampal regions in IF tumor-bearing animals over time, which was confirmed at the mRNA level using relevant microglial markers. Conclusion This is the first experimental evidence to demonstrate the effects of peripheral tumor-induced nociception on hippocampal microglial activation. The increase in hippocampal microglia observed in the present study may reflect the emotional and cognitive deficits reported by patients with CIP.
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Affiliation(s)
- Tanya Miladinovic
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
| | - Manu Sharma
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
| | - Andy Phan
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
| | - Hana Geres
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
| | - Robert G Ungard
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
| | - Katja Linher-Melville
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
| | - Gurmit Singh
- Michael G. DeGroote Institute for Pain Research and Care, Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada, .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4M1, Canada,
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Pampaloni NP, Giugliano M, Scaini D, Ballerini L, Rauti R. Advances in Nano Neuroscience: From Nanomaterials to Nanotools. Front Neurosci 2019; 12:953. [PMID: 30697140 PMCID: PMC6341218 DOI: 10.3389/fnins.2018.00953] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 11/30/2018] [Indexed: 01/04/2023] Open
Abstract
During the last decades, neuroscientists have increasingly exploited a variety of artificial, de-novo synthesized materials with controlled nano-sized features. For instance, a renewed interest in the development of prostheses or neural interfaces was driven by the availability of novel nanomaterials that enabled the fabrication of implantable bioelectronics interfaces with reduced side effects and increased integration with the target biological tissue. The peculiar physical-chemical properties of nanomaterials have also contributed to the engineering of novel imaging devices toward sophisticated experimental settings, to smart fabricated scaffolds and microelectrodes, or other tools ultimately aimed at a better understanding of neural tissue functions. In this review, we focus on nanomaterials and specifically on carbon-based nanomaterials, such as carbon nanotubes (CNTs) and graphene. While these materials raise potential safety concerns, they represent a tremendous technological opportunity for the restoration of neuronal functions. We then describe nanotools such as nanowires and nano-modified MEA for high-performance electrophysiological recording and stimulation of neuronal electrical activity. We finally focus on the fabrication of three-dimensional synthetic nanostructures, used as substrates to interface biological cells and tissues in vitro and in vivo.
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Affiliation(s)
| | - Michele Giugliano
- Department of Biomedical Sciences and Institute Born-Bunge, Molecular, Cellular, and Network Excitability, Universiteit Antwerpen, Antwerpen, Belgium
| | - Denis Scaini
- Neuroscience Area, International School for Advanced Studies (SISSA), Trieste, Italy
- ELETTRA Synchrotron Light Source, Nanoinnovation Lab, Trieste, Italy
| | - Laura Ballerini
- Neuroscience Area, International School for Advanced Studies (SISSA), Trieste, Italy
| | - Rossana Rauti
- Neuroscience Area, International School for Advanced Studies (SISSA), Trieste, Italy
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Intrathecal Injection of Dual Zipper Kinase shRNA Alleviating the Neuropathic Pain in a Chronic Constrictive Nerve Injury Model. Int J Mol Sci 2018; 19:ijms19082421. [PMID: 30115872 PMCID: PMC6121272 DOI: 10.3390/ijms19082421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 08/08/2018] [Accepted: 08/11/2018] [Indexed: 12/20/2022] Open
Abstract
Dual leucine zipper kinase (DLK) is a member of mitogen-activated protein kinase kinase kinase (MAP3K) family mainly involved in neuronal degeneration. However, the role of DLK signaling in the neuropathic pain has not yet been fully determined. Chronic constrictive injury (CCI) was conducted by four 3-0 chromic gut ligatures loosely ligated around the sciatic nerve. Escalated DLK expression over the dorsal root ganglion was observed from one to four rings of CCI. Remarkable expression of DLK was observed in primary dorsal root ganglion cells culture subjected to electrical stimulation and attenuated by DLK short hairpin RNA (shRNA) treatment. Intrathecal injection of DLK shRNA attenuates the expression of DLK over the dorsal root ganglion and hippocampus neurons and increased the threshold of mechanical allodynia and decreased thermal hyperalgesia. In CatWalk gait analysis, significant decreases of print area, maximum contact maximum intensity, stand phase, single stance, and regular index by CCI were alleviated by the DLK shRNA administration. In conclusion, the expression of DLK was up-regulated in chronic constrictive injury and attenuated by the administration of DLK shRNA, which paralleled the improvement of neurobehavior of neuropathic pain. The modulation of DLK expression is a potential clinic treatment option for neuropathic pain.
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10
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Wang RR, Wang Y, Guan SM, Li Z, Kokane S, Cao FL, Sun W, Li CL, He T, Yang Y, Lin Q, Chen J. Synaptic Homeostasis and Allostasis in the Dentate Gyrus Caused by Inflammatory and Neuropathic Pain Conditions. Front Synaptic Neurosci 2018; 10:1. [PMID: 29445338 PMCID: PMC5797731 DOI: 10.3389/fnsyn.2018.00001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/04/2018] [Indexed: 12/13/2022] Open
Abstract
It has been generally accepted that pain can cause imbalance between excitation and inhibition (homeostasis) at the synaptic level. However, it remains poorly understood how this imbalance (allostasis) develops in the CNS under different pain conditions. Here, we analyzed the changes in both excitatory and inhibitory synaptic transmission and modulation of the dentate gyrus (DG) under two pain conditions with different etiology and duration. First, it was revealed that the functions of the input-output (I/O) curves for evoked excitatory postsynaptic currents (eEPSCs) following the perforant path (PP) stimulation were gained under both acute inflammatory and chronic neuropathic pain conditions relative to the controls. However, the functions of I/O curves for the PP-evoked inhibitory postsynaptic currents (eIPSCs) differed between the two conditions, namely it was greatly gained under inflammatory condition, but was reduced under neuropathic condition in reverse. Second, both the frequency and amplitude of miniature IPSCs (mIPSCs) were increased under inflammatory condition, however a decrease in frequency of mIPSCs was observed under neuropathic condition. Finally, the spike discharge of the DG granule cells in response to current injection was significantly increased by neuropathic pain condition, however, no different change was found between inflammatory pain condition and the control. These results provide another line of evidence showing homeostatic and allostatic modulation of excitatory synaptic transmission by inhibitory controls under different pathological pain conditions, hence implicating use of different therapeutic approaches to maintain the homeostasis between excitation and inhibition while treating different conditions of pathological pain.
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Affiliation(s)
- Rui-Rui Wang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Yan Wang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Su-Min Guan
- School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Zhen Li
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Saurabh Kokane
- Department of Psychology, University of Texas at Arlington, Arlington, TX, United States
| | - Fa-Le Cao
- Department of Neurology, The 88th Hospital of People’s Liberation Army, Tai’an, China
| | - Wei Sun
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Chun-Li Li
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Ting He
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Yan Yang
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
| | - Qing Lin
- Department of Psychology, University of Texas at Arlington, Arlington, TX, United States
| | - Jun Chen
- Institute for Biomedical Sciences of Pain, Tangdu Hospital, The Fourth Military Medical University, Xi’an, China
- Key Laboratory of Brain Stress and Behavior, People’s Liberation Army, Xi’an, China
- Beijing Institute for Brain Disorders, Beijing, China
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11
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Zhen J, Qian Y, Weng X, Su W, Zhang J, Cai L, Dong L, An H, Su R, Wang J, Zheng Y, Wang X. Gamma rhythm low field magnetic stimulation alleviates neuropathologic changes and rescues memory and cognitive impairments in a mouse model of Alzheimer's disease. ALZHEIMERS & DEMENTIA-TRANSLATIONAL RESEARCH & CLINICAL INTERVENTIONS 2017; 3:487-497. [PMID: 29124106 PMCID: PMC5671620 DOI: 10.1016/j.trci.2017.07.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Introduction The abnormal amyloid β (Aβ) accumulation and Aβ-related neural network dysfunction are considered central to the pathogenesis of Alzheimer's disease (AD) at the early stage. Deep-brain reachable low field magnetic stimulation (DMS), a novel noninvasive approach that was designed to intervene the network activity in brains, has been found to alleviate stress-related cognitive impairments. Methods Amyloid precursor protein/presenilin-1 transgenic mice (5XFAD) were treated with DMS, and cognitive behavior and AD-like pathologic changes in the neurochemical and electrophysiological properties in 5XFAD mice were assessed. Results We demonstrate that DMS treatment enhances cognitive performances, attenuates Aβ load, upregulates postsynaptic density protein 95 level, and promotes hippocampal long-term potentiation in 5XFAD mouse brain. Intriguingly, the gamma burst magnetic stimulation reverses the aberrant gamma oscillations in the transgenic hippocampal network. Discussion This work establishes a solid foundation for the effectiveness of DMS in treating AD and proposes a future study of gamma rhythm stimulation on reorganizing rhythmic neural activity in AD brain.
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Affiliation(s)
- Junli Zhen
- Department of Neurobiology, Capital Medical University, Beijing, China.,Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China.,The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China
| | - Yanjing Qian
- Department of Neurobiology, Capital Medical University, Beijing, China.,Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China
| | - Xiechuan Weng
- Department of Neurobiology and State Key Laboratory of Proteomics, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Wenting Su
- Beijing Institute for Brain Disorders, Beijing, China
| | - Jianliang Zhang
- Department of Neurobiology, Capital Medical University, Beijing, China
| | - Lihui Cai
- School of Electrical Engineering and Automation, Tianjin University, Tianjin, China
| | - Lin Dong
- Department of Neurobiology, Capital Medical University, Beijing, China.,Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China
| | - Haiting An
- Department of Neurobiology, Capital Medical University, Beijing, China.,Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China
| | - Ruijun Su
- Department of Neurobiology, Capital Medical University, Beijing, China.,Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China
| | - Jiang Wang
- School of Electrical Engineering and Automation, Tianjin University, Tianjin, China
| | - Yan Zheng
- Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China.,Department of Physiology, Capital Medical University, Beijing, China
| | - Xiaomin Wang
- Department of Neurobiology, Capital Medical University, Beijing, China.,Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Beijing, China
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12
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Chen RW, Liu H, An JX, Qian XY, Jiang YD, Cope DK, Williams JP, Zhang R, Sun LN. Cognitive effects of electro-acupuncture and pregabalin in a trigeminal neuralgia rat model induced by cobra venom. J Pain Res 2017; 10:1887-1897. [PMID: 28860844 PMCID: PMC5558586 DOI: 10.2147/jpr.s140840] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Objective The objective of this study was to investigate the effects of electro-acupuncture (EA) and pregabalin on cognition impairment induced by chronic trigeminal neuralgia (TN) in rats. Design Controlled animal study. Setting Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University. Subjects Forty adult male Sprague Dawley rats. Methods Rats were randomly divided into four groups. The TN model was induced by administration of cobra venom to the left infraorbital nerve. On postoperative day 14, either EA or pregabalin was administered, free behavioral activities were observed. Spatial learning and memory abilities were determined in the Morris water maze. The ultrastructural alterations of the Gasserian ganglion, medulla oblongata and hippocampus were examined by electron microscopy. The changes on long-term potentiation were investigated. Results After treatment, the exploratory behavior increased and the grooming behavior decreased (P<0.05) for the EA group and pregabalin group compared with the cobra venom group; moreover, demyelination of neurons in Gasserian ganglion and medulla oblongata was reversed. The number of platform site crossings, the average percentages of time in the target quadrant and the field excitatory postsynaptic potential slopes increased (P<0.05) in the EA group compared to the cobra venom group. However, the pregabalin group showed no differences compared to the cobra venom group (P>0.05). Vacuolar degeneration in the hippocampal neurons was mild in the EA group, while it was severe in the pregabalin group. Conclusion EA and pregabalin could alleviate TN induced by cobra venom. EA could also inhibit the cognition deficit induced by TN, while pregabalin could not.
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Affiliation(s)
- Ruo-Wen Chen
- Department of Anesthesiology, Weifang Medical University, Weifang City, Shandong.,Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing, China
| | - Hui Liu
- Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing, China
| | - Jian-Xiong An
- Department of Anesthesiology, Weifang Medical University, Weifang City, Shandong.,Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing, China
| | - Xiao-Yan Qian
- Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing, China
| | - Yi-De Jiang
- Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing, China
| | - Doris K Cope
- Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - John P Williams
- Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Rui Zhang
- Department of Anesthesiology, Weifang Medical University, Weifang City, Shandong
| | - Li-Na Sun
- Department of Anesthesiology, Weifang Medical University, Weifang City, Shandong
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13
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Chen A, Chen Y, Tang Y, Bao C, Cui Z, Xiao M, Lin C. Hippocampal AMPARs involve the central sensitization of rats with irritable bowel syndrome. Brain Behav 2017; 7:e00650. [PMID: 28293483 PMCID: PMC5346530 DOI: 10.1002/brb3.650] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 11/29/2016] [Accepted: 12/22/2016] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE The roles of hippocampal AMPARs were investigated in irritable bowel syndrome (IBS)-like rats to clarify the central sensitization mechanisms. METHODS IBS model was induced by neonatal maternal separation. The effects of AMPARs on visceral hypersensitivity were examined by the responses of abdominal muscle to colorectal distension after the bilateral intrahippocampal injections of CNQX (an AMPAR inhibitor). The expressions of hippocampal AMPARs (GluR1 and GluR2) were determined by Western blot. RESULTS The IBS-like rats showed visceral hypersensitivity when compared with controls. Bilateral intrahippocampal injections of CNQX alleviated the visceral pain in IBS-like rats. The maximal effect appeared at the time point of 30 min, and the duration lasted for 90 min after CNQX application, under 40 and 60 mmHg CRD. The expressions of hippocampal GluR2 significantly increased in IBS-like rats when compared with controls (p < .05). However, the levels of hippocampal GluR1 had no significant differences in rats. Hippocampal LTP induced by HFS was significantly enhanced when compared with controls (p < .05). The expressions of GluR2 significantly increased in the control and IBS-like rats after 60 min LTP of recordings (p < .05), but not GluR1. CONCLUSION Neonatal maternal separation enhances the expression of GluR2 and facilitates the LTP in the hippocampus, which could lead to the formation of visceral hypersensitivity when grown up.
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Affiliation(s)
- Aiqin Chen
- Fujian Provincial Key Laboratory of Neuroglia and DiseasesLaboratory of Pain ResearchDepartment of Physiology and PathophysiologyFujian Medical UniversityFuzhouFujianChina
| | - Yu Chen
- Fujian Provincial Key Laboratory of Neuroglia and DiseasesLaboratory of Pain ResearchDepartment of Physiology and PathophysiologyFujian Medical UniversityFuzhouFujianChina
| | - Ying Tang
- Fujian Provincial Key Laboratory of Neuroglia and DiseasesLaboratory of Pain ResearchDepartment of Physiology and PathophysiologyFujian Medical UniversityFuzhouFujianChina
| | - Chengjia Bao
- Fujian Provincial Key Laboratory of Neuroglia and DiseasesLaboratory of Pain ResearchDepartment of Physiology and PathophysiologyFujian Medical UniversityFuzhouFujianChina
| | - Zizhi Cui
- Fujian Provincial Key Laboratory of Neuroglia and DiseasesLaboratory of Pain ResearchDepartment of Physiology and PathophysiologyFujian Medical UniversityFuzhouFujianChina
| | - Meng Xiao
- 2013 Seven‐year Clinical MedicineFujian Medical UniversityFuzhouFujianChina
| | - Chun Lin
- Fujian Provincial Key Laboratory of Neuroglia and DiseasesLaboratory of Pain ResearchDepartment of Physiology and PathophysiologyFujian Medical UniversityFuzhouFujianChina
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14
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Moriarty O, Gorman CL, McGowan F, Ford GK, Roche M, Thompson K, Dockery P, McGuire BE, Finn DP. Impaired recognition memory and cognitive flexibility in the rat L5-L6 spinal nerve ligation model of neuropathic pain. Scand J Pain 2016; 10:61-73. [PMID: 28361775 DOI: 10.1016/j.sjpain.2015.09.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 09/29/2015] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND AIMS Although neuropathic pain is known to negatively affect cognition, the neural mechanisms involved are poorly understood. Chronic pain is associated with changes in synaptic plasticity in the brain which may impact on cognitive functioning. The aim of this study was to model neuropathic pain in mid-aged rats using spinal nerve ligation (SNL). Following establishment of allodynia and hyperalgesia, behaviour was assessed in a battery of cognitive tests. Expression of the presynaptic protein, synaptophysin, and its colocalisation with the vesicular GABA and glutamate transporters (vGAT and vGLUT, respectively), was investigated in the medial prefrontal cortex (mPFC) and hippocampus. METHODS Nine month old male Sprague Dawley rats underwent L5-L6 spinal nerve ligation or a sham procedure. Mechanical and cold allodynia and thermal hyperalgesia were assessed using von Frey, acetone and Hargreaves tests, respectively. Cognition was assessed in the novel-object recognition, air-puff passive avoidance and Morris water maze behavioural tasks. Immunohistochemistry was used to examine the expression of synaptophysin in the mPFC and CA1 region of the hippocampus and double labelling of synaptophysin and the vesicular transporters vGAT and vGlut was used to investigate the distribution of synaptophysin on GABAergic and glutamatergic neurons. RESULTS SNL rats displayed impaired performance in the novel-object recognition task. Passive-avoidance responding, and spatial learning and memory in the Morris water maze, were unaffected by SNL surgery. However, in the water maze reversal task, pain-related impairments were evident during training and probe trials. SNL surgery was not associated with any differences in the expression of synaptophysin or its colocalisation with vGAT or vGLUT in the mPFC or the hippocampal CA1 region. CONCLUSIONS These results suggest that the SNL model of neuropathic pain is associated with deficits in recognition memory and cognitive flexibility, but these deficits are not associated with altered synaptophysin expression or distribution in the mPFC and CA1. IMPLICATIONS Cognitive complaints are common amongst chronic pain patients. Here we modelled cognitive impairment in a well-established animal model of neuropathic pain and investigated the neural mechanisms involved. A better understanding of this phenomenon is an important prerequisite for the development of improved treatment of patients affected.
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Affiliation(s)
- Orla Moriarty
- Pharmacology and Therapeutics, School of Medicine, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Pain Research, National University of Ireland, Galway, Ireland
| | - Claire L Gorman
- Pharmacology and Therapeutics, School of Medicine, National University of Ireland, Galway, Ireland
| | - Fiona McGowan
- Pharmacology and Therapeutics, School of Medicine, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Pain Research, National University of Ireland, Galway, Ireland
| | - Gemma K Ford
- Pharmacology and Therapeutics, School of Medicine, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Pain Research, National University of Ireland, Galway, Ireland
| | - Michelle Roche
- Physiology, School of Medicine, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Pain Research, National University of Ireland, Galway, Ireland
| | - Kerry Thompson
- Anatomy, School of Medicine, National University of Ireland, Galway, Ireland
- Centre for Microscopy and Imaging, National University of Ireland, Galway, Ireland
| | - Peter Dockery
- Anatomy, School of Medicine, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Microscopy and Imaging, National University of Ireland, Galway, Ireland
| | - Brian E McGuire
- School of Psychology, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Pain Research, National University of Ireland, Galway, Ireland
| | - David P Finn
- Pharmacology and Therapeutics, School of Medicine, National University of Ireland, Galway, Ireland
- NCBES Neuroscience Centre, National University of Ireland, Galway, Ireland
- Centre for Pain Research, National University of Ireland, Galway, Ireland
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15
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Xu Q, Liu T, Chen S, Gao Y, Wang J, Qiao L, Liu J. The cumulative analgesic effect of repeated electroacupuncture involves synaptic remodeling in the hippocampal CA3 region. Neural Regen Res 2015; 7:1378-85. [PMID: 25657670 PMCID: PMC4308787 DOI: 10.3969/j.issn.1673-5374.2012.18.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 05/03/2012] [Indexed: 11/18/2022] Open
Abstract
In the present study, we examined the analgesic effect of repeated electroacupuncture at bilateral Zusanli (ST36) and Yanglingquan (GB34) once a day for 14 consecutive days in a rat model of chronic sciatic nerve constriction injury-induced neuropathic pain. In addition, concomitant changes in calcium/calmodulin-dependent protein kinase II expression and synaptic ultrastructure of neurons in the hippocampal CA3 region were examined. The thermal pain threshold (paw withdrawal latency) was increased significantly in both groups at 2 weeks after electroacupuncture intervention compared with 2 days of electroacupuncture. In ovariectomized rats with chronic constriction injury, the analgesic effect was significantly reduced. Electroacupuncture for 2 weeks significantly diminished the injury-induced increase in synaptic cleft width and thinning of the postsynaptic density, and it significantly suppressed the down-regulation of intracellular calcium/calmodulin-dependent protein kinase II expression in the hippocampal CA3 region. Repeated electroacupuncture intervention had a cumulative analgesic effect on injury-induced neuropathic pain reactions, and it led to synaptic remodeling of hippocampal neurons and upregulated calcium/calmodulin-dependent protein kinase II expression in the hippocampal CA3 region.
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Affiliation(s)
- Qiuling Xu
- Hainan Medical University, Haikou 571101, Hainan Province, China
| | - Tao Liu
- Hainan Medical University, Haikou 571101, Hainan Province, China
| | - Shuping Chen
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Yonghui Gao
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Junying Wang
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Lina Qiao
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Junling Liu
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing 100700, China
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16
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Yalcin I, Barthas F, Barrot M. Emotional consequences of neuropathic pain: insight from preclinical studies. Neurosci Biobehav Rev 2014; 47:154-64. [PMID: 25148733 DOI: 10.1016/j.neubiorev.2014.08.002] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 07/15/2014] [Accepted: 08/03/2014] [Indexed: 01/12/2023]
Abstract
Mood disorders such as depression and anxiety are frequently observed in patients suffering from chronic pain, including neuropathic pain. While this comorbidity is clinically well established, the underlying mechanism(s) remained unclear. The recent development of animal models now allows addressing the consequences of neuropathic pain. In this review, we report the preclinical evidences from anatomical, neuroimaging, behavioral, pharmacological and biochemical studies that address the anxiodepressive consequences of neuropathic pain. We present an overview of rodent models of these consequences and we discuss the challenges and parameters to consider for generating these models. We then discuss the possible mechanism(s) underlying anxiodepressive consequences by describing morphological and functional changes. Information is provided concerning neuroanatomical changes and plasticity, including LTP and LTD, in the anterior cingulate cortex, the insula, the hippocampus, the amygdala and the mesolimbic system, neuroendocrine parameters concerning the hypothalamo-pituitary-adrenal axis, neuroimmune response including the role of glial cells and cytokines, monoamine systems and changes in locus coeruleus noradrenergic system, and neurotrophic factors such as BDNF.
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Affiliation(s)
- Ipek Yalcin
- Institut des Neurosciences Cellulaires et Intégratives, Centre National de la Recherche Scientifique, 67084 Strasbourg, France.
| | - Florent Barthas
- Institut des Neurosciences Cellulaires et Intégratives, Centre National de la Recherche Scientifique, 67084 Strasbourg, France; Université de Strasbourg, 67084 Strasbourg, France
| | - Michel Barrot
- Institut des Neurosciences Cellulaires et Intégratives, Centre National de la Recherche Scientifique, 67084 Strasbourg, France
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17
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Zhao DJ, Wang ZY, Huang L, Jia YP, Leng JQ. Spatio-temporal mapping of variation potentials in leaves of Helianthus annuus L. seedlings in situ using multi-electrode array. Sci Rep 2014; 4:5435. [PMID: 24961469 PMCID: PMC4069705 DOI: 10.1038/srep05435] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 06/05/2014] [Indexed: 12/30/2022] Open
Abstract
Damaging thermal stimuli trigger long-lasting variation potentials (VPs) in higher plants. Owing to limitations in conventional plant electrophysiological recording techniques, recorded signals are composed of signals originating from all of the cells that are connected to an electrode. This limitation does not enable detailed spatio-temporal distributions of transmission and electrical activities in plants to be visualised. Multi-electrode array (MEA) enables the recording and imaging of dynamic spatio-temporal electrical activities in higher plants. Here, we used an 8 × 8 MEA with a polar distance of 450 μm to measure electrical activities from numerous cells simultaneously. The mapping of the data that were recorded from the MEA revealed the transfer mode of the thermally induced VPs in the leaves of Helianthus annuus L. seedlings in situ. These results suggest that MEA can enable recordings with high spatio-temporal resolution that facilitate the determination of the bioelectrical response mode of higher plants under stress.
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Affiliation(s)
- Dong-Jie Zhao
- College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
| | - Zhong-Yi Wang
- College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
| | - Lan Huang
- College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
| | | | - John Q. Leng
- Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06520, USA
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18
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Hippocampal NR2B-containing NMDA receptors enhance long-term potentiation in rats with chronic visceral pain. Brain Res 2014; 1570:43-53. [DOI: 10.1016/j.brainres.2014.05.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 03/13/2014] [Accepted: 05/02/2014] [Indexed: 02/06/2023]
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19
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Noradrenergic mechanism involved in the nociceptive modulation of hippocampal CA3 region of normal rats. Neurosci Lett 2014; 574:31-5. [PMID: 24846417 DOI: 10.1016/j.neulet.2014.05.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 05/06/2014] [Accepted: 05/12/2014] [Indexed: 11/21/2022]
Abstract
Norepinephrine (NE) is an important neurotransmitter in the brain, and regulates antinociception. However, the mechanism of action of NE on pain-related neurons in the hippocampal CA3 region is not clear. This study examines the effects of NE, phentolamine on the electrical activities of pain-excited neurons (PENs) and pain-inhibited neurons (PINs) in the hippocampal CA3 region of rats. Trains of electric impulses applied to the right sciatic nerve were used as noxious stimulation. The electrical activities of PENs or PINs in the hippocampal CA3 region were recorded by using a glass microelectrode. Our results revealed that, in the hippocampal CA3 region, the intra-CA3 region microinjection of NE decreased the pain-evoked discharged frequency and prolonged the discharged latency of PEN, and increased the pain-evoked discharged frequency and shortened discharged inhibitory duration (ID) of PIN, exhibiting the specific analgesic effect of NE. While intra-CA3 region microinjection of phentolamine produced the opposite response. It implies that phentolamine can block the effect of endogenous NE to cause the enhanced response of PEN and PIN to noxious stimulation. On the basis of above findings we can deduce that NE, phentolamine and alpha-adrenoceptor are involved in the modulation of nociceptive information transmission in the hippocampal CA3 region.
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Liu MG, Chen J. Preclinical research on pain comorbidity with affective disorders and cognitive deficits: Challenges and perspectives. Prog Neurobiol 2014; 116:13-32. [DOI: 10.1016/j.pneurobio.2014.01.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 12/31/2013] [Accepted: 01/02/2014] [Indexed: 12/12/2022]
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21
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Lu YF, Wang Y, He Y, Zhang FK, He T, Wang RR, Chen XF, Yang F, Gong KR, Chen J. Spatial and temporal plasticity of synaptic organization in anterior cingulate cortex following peripheral inflammatory pain: multi-electrode array recordings in rats. Neurosci Bull 2014; 30:1-20. [PMID: 23686522 PMCID: PMC5561851 DOI: 10.1007/s12264-013-1344-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 04/19/2013] [Indexed: 12/23/2022] Open
Abstract
To explore whether experiencing inflammatory pain has an impact upon intracortical synaptic organization, the planar multi-electrode array (MEA) technique and 2-dimensional current source density (2D-CSD) imaging were used in slice preparations of the anterior cingulate cortex (ACC) from rats. Synaptic activity across different layers of the ACC was evoked by deep layer stimulation through one electrode. The layer-localization of both local field potentials (LFPs) and the spread of current sink calculated by 2D-CSD analysis was characterized pharmacologically. Moreover, the induction of long-term potentiation (LTP) and changes in LTP magnitude were also evaluated. We found that under naïve conditions, the current sink was initially generated in layer VI, then spread to layer V and finally confined to layers II-III. This spatial pattern of current sink movement typically reflected changes in depolarized sites from deep layers (V-VI) to superficial layers (II-III) where intra- and extracortical inputs terminate. In the ACC slices from rats in an inflamed state (for 2 h) caused by intraplantar bee-venom injection, the spatial profile of intra-ACC synaptic organization was significantly changed, showing an enlarged current sink distribution and a leftward shift of the stimulus-response curves relative to the naïve and saline controls. The change was more distinct in the superficial layers (II-III) than in the deep site. In terms of temporal properties, the rate of LTP induction was significantly increased in layers II-III by inflammatory pain. However, the magnitude of LTP was not significantly enhanced by this treatment. Taken together, these results show that inflammatory pain results in distinct spatial and temporal plasticity of synaptic organization in the ACC, which may lead to altered synaptic transmission and modulation.
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Affiliation(s)
- Yun-Fei Lu
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
| | - Yan Wang
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
| | - Ying He
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing, 100069 China
| | - Fu-Kang Zhang
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing, 100069 China
| | - Ting He
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
| | - Rui-Rui Wang
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing, 100069 China
| | - Xue-Feng Chen
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
| | - Fei Yang
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
| | - Ke-Rui Gong
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing, 100069 China
| | - Jun Chen
- Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders, Tangdu Hospital, The Fourth Military Medical University, Xi’an, 710038 China
- Key Laboratory of Brain Stress and Behavior, PLA, Xi’an, 710038 China
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing, 100069 China
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Liu MG, Zhuo M. Loss of long-term depression in the insular cortex after tail amputation in adult mice. Mol Pain 2014; 10:1. [PMID: 24398034 PMCID: PMC3912895 DOI: 10.1186/1744-8069-10-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 12/30/2013] [Indexed: 01/01/2023] Open
Abstract
The insular cortex (IC) is an important forebrain structure involved in pain perception and taste memory formation. Using a 64-channel multi-electrode array system, we recently identified and characterized two major forms of synaptic plasticity in the adult mouse IC: long-term potentiation (LTP) and long-term depression (LTD). In this study, we investigate injury-related metaplastic changes in insular synaptic plasticity after distal tail amputation. We found that tail amputation in adult mice produced a selective loss of low frequency stimulation-induced LTD in the IC, without affecting (RS)-3,5-dihydroxyphenylglycine (DHPG)-evoked LTD. The impaired insular LTD could be pharmacologically rescued by priming the IC slices with a lower dose of DHPG application, a form of metaplasticity which involves activation of protein kinase C but not protein kinase A or calcium/calmodulin-dependent protein kinase II. These findings provide important insights into the synaptic mechanisms of cortical changes after peripheral amputation and suggest that restoration of insular LTD may represent a novel therapeutic strategy against the synaptic dysfunctions underlying the pathophysiology of phantom pain.
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Affiliation(s)
| | - Min Zhuo
- Center for Neuron and Disease, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
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Lyu D, Yu W, Tang N, Wang R, Zhao Z, Xie F, He Y, Du H, Chen J. The mTOR signaling pathway regulates pain-related synaptic plasticity in rat entorhinal-hippocampal pathways. Mol Pain 2013; 9:64. [PMID: 24313960 PMCID: PMC3892125 DOI: 10.1186/1744-8069-9-64] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 11/22/2013] [Indexed: 01/01/2023] Open
Abstract
Background Our previous work demonstrated that persistent peripheral nociception (PPN) leads to synaptic plasticity and functional changes in the rat hippocampus. The protein kinase mTOR is a critical regulator of protein synthesis-dependent synaptic plasticity in the hippocampus as well as synaptic plasticity associated with central and peripheral pain sensitization. We examined the role of mTOR signaling in pain-associated entorhinal cortex (EC) - hippocampal synaptic plasticity to reveal possible cellular mechanisms underlying the effects of chronic pain on cognition and emotion. Results Subcutaneous injection of bee venom (BV) into one hind paw to induce PPN resulted in sustained (> 8 h) mTOR phospho-activation and enhanced phosphorylation of the mTOR target p70 S6 kinase (S6K) in the hippocampus. The magnitude and duration of long-term potentiation (LTP) in both EC - dentate gyrus (DG) and EC - CA1 synaptic pathways were elevated in BV-treated rats as measured by microelectrode array recording. Moreover, the number of potentiated synapses in the hippocampus was markedly upregulated by BV-induced PPN. Both elevated mTOR-S6K signaling and enhanced LTP induced by BV injection were reversed by systemic injection of the mTOR inhibitor rapamycin (RAPA). Rats injected with BV exhibited markedly reduced ambulation and exploratory activity in the open field (signs of depression and anxiety) compared to controls, and these effects were also reversed by RAPA. Conclusion We suggest that PPN-induced enhancement of synaptic plasticity in EC - hippocampal pathways and the behavioral effects of PPN are dependent on mTOR-S6K signaling.
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Affiliation(s)
| | | | | | | | | | | | | | - Hongyin Du
- Department of Anesthesiology, Tianjin First Center Hospital, TianJin 300192, China.
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Neuronal cell patterning on a multi-electrode array for a network analysis platform. Biomaterials 2013; 34:5210-7. [DOI: 10.1016/j.biomaterials.2013.03.042] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 03/15/2013] [Indexed: 11/18/2022]
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25
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Use of multi-electrode array recordings in studies of network synaptic plasticity in both time and space. Neurosci Bull 2012; 28:409-22. [PMID: 22833039 DOI: 10.1007/s12264-012-1251-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Simultaneous multisite recording using multi-electrode arrays (MEAs) in cultured and acutely-dissociated brain slices and other tissues is an emerging technique in the field of network electrophysiology. Over the past 40 years, great efforts have been made by both scientists and commercial concerns, to advance this technique. The MEA technique has been widely applied to many regions of the brain, retina, heart and smooth muscle in various studies at the network level. The present review starts from the development of MEA techniques and their uses in brain preparations, and then specifically concentrates on the use of MEA recordings in studies of synaptic plasticity at the network level in both the temporal and spatial domains. Because the MEA technique helps bridge the gap between single-cell recordings and behavioral assays, its wide application will undoubtedly shed light on the mechanisms underlying brain functions and dysfunctions at the network level that remained largely unknown due to the technical difficulties before it matured.
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Ning N, Hu JF, Sun JD, Han N, Zhang JT, Chen NH. (−)Clausenamide facilitates synaptic transmission at hippocampal Schaffer collateral-CA1 synapses. Eur J Pharmacol 2012; 682:50-5. [DOI: 10.1016/j.ejphar.2012.02.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 02/02/2012] [Accepted: 02/08/2012] [Indexed: 10/28/2022]
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Ma X, Shi TF, Zhang M, Lu XY, Yang CX, Zhu D, Shi DX, Yang Y, Wang CL, Zhang S, Xu MY. Modulatory role of glutamic acid on the electrical activities of pain-related neurons in the hippocampal CA3 region. Neurosci Lett 2012; 513:67-71. [PMID: 22343020 DOI: 10.1016/j.neulet.2012.02.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2011] [Revised: 02/02/2012] [Accepted: 02/02/2012] [Indexed: 10/14/2022]
Abstract
Glutamic acid (Glu) participates in pain modulation of the central nervous system. The CA3 region of the hippocampal formation has been suggested to be involved in nociceptive perception. However, it is unknown whether Glu could modulate the electrical activities of pain-related neurons in the hippocampal CA3 region. The present study aimed to determine the effects of Glu and its receptor antagonist MK-801 in the pain-evoked response of both pain-excited neurons (PENs) and pain-inhibited neurons (PINs) in the hippocampal CA3 region of normal rats. We used a train of electric impulses applied to the sciatic nerve as noxious stimulation. The electrical activities of either PENs or PINs in the hippocampal CA3 region were recorded by a glass microelectrode. The results revealed that intra-CA3 region microinjection of Glu (0.5 μg/1 μl) increased the evoked firing frequency and shortened the firing latency of PEN, while decreased the evoked firing frequency and prolonged the inhibitory duration of PIN in the hippocampal CA3 region of rat evoked by the noxious stimulation. Intra-CA3 region administration of MK-801 (0.25 μg/1 μl) produced the opposite response. These results suggest that Glu and its receptors in hippocampal CA3 region are involved in the modulation of nociceptive information transmission by affecting the electric activities of PENs and PINs.
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Affiliation(s)
- Xu Ma
- Department of Neurology and Surgery of Second Affiliated Hospital, Harbin Medical University, 194 Xuefu Road, Nangang District, Harbin, Heilongjiang 150081, China
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Counteracting roles of metabotropic glutamate receptor subtypes 1 and 5 in regulation of pain-related spatial and temporal synaptic plasticity in rat entorhinal-hippocampal pathways. Neurosci Lett 2011; 507:38-42. [PMID: 22172929 DOI: 10.1016/j.neulet.2011.11.046] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 11/21/2011] [Accepted: 11/23/2011] [Indexed: 11/22/2022]
Abstract
It was previously found that persistent inflammatory pain state resulted in enhancement of synaptic connections and efficacy in direct entorhinal-hippocampal (EC-HIP) pathways. In the current study, the roles of two subtypes of group I metabotropic glutamate receptors in the above processes were evaluated. Similarly, pain-related spatial and temporal synaptic enhancement model was stably achieved by the multi-electrode array (8×8) recordings in the hippocampal slices of rats pre-treated with intraplantar (i.pl.) bee venom (BV) injection. I.pl. saline injection was used as control. Inhibition of mGluR1 by a selective antagonist 7-hydroxyiminocyclopropan [b] chromen-1α-carboxylic acid ethyl ester (CPCCOEt) resulted in a dramatic increase in synaptic connections in the hippocampal slices of rats treated by BV, but not by saline. However, inhibition of mGluR5 by a selective antagonist 2-methyl-6-(phenylethynyl)-pyridine (MPEP) produced no spatial change from either of the two groups. Temporally, the BV-enhanced LTP could be further incremented by antagonism of mGluR1 with CPCCOEt perfusion when plateau LTP was well established. However, the BV-enhanced LTP was significantly suppressed by antagonism of mGluR5 with MPEP. Neither of the two drugs affected magnitude of LTP in rats treated by i.pl. saline. Taken together with our previous results, it is suggested that mGluR1 be involved in tonic inhibition of EC-HIP synaptic enhancement, while mGluR5 be involved in maintenance of persistent inflammatory pain-associated EC-HIP synaptic enhancement that is largely based upon activation of ionic glutamate receptors.
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Sase A, Khan D, Höger H, Lubec G. Intraperitoneal injection of saline modulates hippocampal brain receptor complex levels but does not impair performance in the Morris Water Maze. Amino Acids 2011; 43:783-92. [DOI: 10.1007/s00726-011-1130-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 10/19/2011] [Indexed: 01/03/2023]
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Simultaneous multisite recordings of neural ensemble responses in the motor cortex of behaving rats to peripheral noxious heat and chemical stimuli. Behav Brain Res 2011; 223:192-202. [DOI: 10.1016/j.bbr.2011.04.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 04/13/2011] [Accepted: 04/20/2011] [Indexed: 11/24/2022]
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Cardoso-Cruz H, Lima D, Galhardo V. Instability of spatial encoding by CA1 hippocampal place cells after peripheral nerve injury. Eur J Neurosci 2011; 33:2255-64. [PMID: 21615562 DOI: 10.1111/j.1460-9568.2011.07721.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Several authors have shown that the hippocampus responds to painful stimulation and suggested that prolonged painful conditions could lead to abnormal hippocampal functioning. The aim of the present study was to evaluate whether the induction of persistent peripheral neuropathic pain would affect basic hippocampal processing such as the spatial encoding performed by CA1 place cells. These place cells fire preferentially in a certain spatial position in the environment, and this spatial mapping remains stable across multiple experimental sessions even when the animal is removed from the testing environment. To address the effect of prolonged pain on the stability of place cell encoding, we chronically implanted arrays of electrodes in the CA1 hippocampal region of adult rats and recorded the multichannel neuronal activity during a simple food-reinforced alternation task in a U-shaped runway. The activity of place cells was followed over a 3-week period before and after the establishment of an animal model of neuropathy, spared nerve injury. Our results show that the nerve injury increased the number of place fields encoded per cell and the mapping size of the place fields. In addition, there was an increase in in-field coherence while the amount of spatial information content that a single spike conveyed about the animal location decreased over time. Other measures of spatial tuning (in-field firing rate, firing peak and number of spikes) were unchanged between the experimental groups. These results demonstrate that the functioning of spatial place cells is altered during neuropathic pain conditions.
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Affiliation(s)
- Helder Cardoso-Cruz
- Instituto de Biologia Molecular e Celular (IBMC), Grupo de Morfofisiologia do Sistema Somatosensitivo, Universidade do Porto, 4150-180 Porto, Portugal
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Differential roles of ERK, JNK and p38 MAPK in pain-related spatial and temporal enhancement of synaptic responses in the hippocampal formation of rats: Multi-electrode array recordings. Brain Res 2011; 1382:57-69. [DOI: 10.1016/j.brainres.2011.01.076] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 11/21/2010] [Accepted: 01/24/2011] [Indexed: 12/30/2022]
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The effect of acetylcholine on pain-related electric activities in the hippocampal CA3 of rats. J Neural Transm (Vienna) 2011; 118:555-61. [PMID: 21246223 DOI: 10.1007/s00702-010-0545-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2010] [Accepted: 11/29/2010] [Indexed: 11/30/2022]
Abstract
Acetylcholine (ACh) regulates pain perception in the central nervous system. However, the mechanism of action of ACh on pain-related neurons in the hippocampal CA3 is not clear. The present study aimed to determine the effect of ACh, muscarinic ACh receptors (mAChRs) agonist pilocarpine and mAChRs antagonist atropine on the pain-evoked responses of pain-excited neuron (PEN) and pain-inhibited neuron (PIN) in the hippocampal CA3 of normal rats. The trains of electric impulses applied to the sciatic nerve were used as noxious stimulation. The electric activities of PEN or PIN in the hippocampal CA3 were recorded by using a glass microelectrode. Our results showed that, in the hippocampal CA3, the intra-CA3 microinjection of ACh (2 μg/1 μl) or pilocarpine (2 μg/1 μl) decreased the discharge frequency and prolonged firing latency of PEN, and increased the discharge frequency and shortened firing inhibitory duration (ID) of PIN, i.e. exhibiting the analgesic effect of ACh or pilocarpine. The intra-CA3 administration of atropine (0.5 μg/1 μl) produced an opposite effect. On the basis of the above-mentioned findings, we can deduce that ACh and mAChRs in the hippocampal CA3 are involved in the modulation of nociceptive response by regulating the electric activities of PEN and PIN.
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Gong KR, Cao FL, He Y, Gao CY, Wang DD, Li H, Zhang FK, An YY, Lin Q, Chen J. Enhanced excitatory and reduced inhibitory synaptic transmission contribute to persistent pain-induced neuronal hyper-responsiveness in anterior cingulate cortex. Neuroscience 2010; 171:1314-25. [DOI: 10.1016/j.neuroscience.2010.10.028] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 10/08/2010] [Accepted: 10/12/2010] [Indexed: 12/31/2022]
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Wang DD, Li Z, Chang Y, Wang RR, Chen XF, Zhao ZY, Cao FL, Jin JH, Liu MG, Chen J. Neural circuits and temporal plasticity in hindlimb representation of rat primary somatosensory cortex: revisited by multi-electrode array on brain slices. Neurosci Bull 2010; 26:175-87. [PMID: 20502495 DOI: 10.1007/s12264-010-0308-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVE The well-established planar multi-electrode array recording technique was used to investigate neural circuits and temporal plasticity in the hindlimb representation of the rat primary somatosensory cortex (S1 area). METHODS Freshly dissociated acute brain slices of rats were subject to constant perfusion with oxygenated artificial cerebrospinal fluid (95% O(2) and 5% CO(2)), and were mounted on a Med64 probe (64 electrodes, 8x8 array) for simultaneous multi-site electrophysiological recordings. Current sources and sinks across all the 64 electrodes were transformed into two-dimensional current source density images by bilinear interpolation at each point of the 64 electrodes. RESULTS The local intracortical connection, which is involved in mediation of downward information flow across layers II-VI, was identified by electrical stimulation (ES) at layers II-III. The thalamocortical connection, which is mainly involved in mediation of upward information flow across layers II-IV, was also characterized by ES at layer IV. The thalamocortical afferent projections were likely to make more synaptic contacts with S1 neurons than the intracortical connections did. Moreover, the S1 area was shown to be more easily activated and more intensively innervated by the thalamocortical afferent projections than by the intracortical connections. Finally, bursting conditioning stimulus (CS) applied within layer IV of the S1 area could successfully induce long-term potentiation (LTP) in 5 of the 6 slices (83.3%), while the same CS application at layers II-III induced no LTP in any of the 6 tested slices. CONCLUSION The rat hindlimb representation of S1 area is likely to have at least 2 patterns of neural circuits on brain slices: one is the intracortical circuit (ICC) formed by interlaminar connections from layers II-III, and the other is the thalamocortical circuit (TCC) mediated by afferent connections from layer IV. Besides, ICC of the S1 area is spatially limited, with less plasticity, while TCC is spatially extensive and exhibits a better plasticity in response to somatosensory afferent stimulation. The present data provide a useful experimental model for further studying microcircuit properties in S1 cortex at the network level in vitro.
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Affiliation(s)
- Dan-Dan Wang
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing 100069, China
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Abstract
Pain is a complex experience consisting of sensory-discriminative, affective-motivational, and cognitive-evaluative dimensions. Now it has been gradually known that noxious information is processed by a widely-distributed, hierarchically- interconnected neural network, referred to as neuromatrix, in the brain. Thus, identifying the multiple neural networks subserving these functional aspects and harnessing this knowledge to manipulate the pain response in new and beneficial ways are challenging tasks. Albeit with elaborate research efforts on the cortical responses to painful stimuli or clinical pain, involvement of the hippocampal formation (HF) in pain is still a matter of controversy. Here, we integrate previous animal and human studies from the viewpoint of HF and pain, sequentially representing anatomical, behavioral, electrophysiological, molecular/biochemical and functional imaging evidence supporting the role of HF in pain processing. At last, we further expound on the relationship between pain and memory and present some unresolved issues.
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Affiliation(s)
- Ming-Gang Liu
- Institute for Biomedical Sciences of Pain, Capital Medical University, Beijing 100069, China
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