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[Expression of KCNA2 in the dorsal root ganglia of rats with osteoarthritis pain induced by monoiodoacetate]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2019; 39:579-585. [PMID: 31140423 PMCID: PMC6743928 DOI: 10.12122/j.issn.1673-4254.2019.05.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
OBJECTIVE To investigate the changes in the expression of voltage-gated potassium channel subunit KCNA2 in the dorsal root ganglion (DRG) neurons of rats with osteoarthritis (OA) pain induced by sodium monoiodoacetate and explore the mechanism. METHODS A total of 156 adult male Sprague-Dawley rats were randomly divided into blank control group, saline group and intra-articular monoiodoacetate injection-induced OA group. The paw withdrawal mechanical threshold (PWMT) was measured before and at 1, 2, 4, and 6 weeks after monoiodoacetate injection. At 4 weeks after the injection, the pathological changes in the knee joints were analyzed using HE staining and Safranin O-Fast Green staining, and the expression of activating transcription factor 3 (ATF-3) and inducible nitric oxide synthase (iNOS) in the DRG neurons were detected by immunofluorescence staining. The expression of Kcna2 mRNA in the DRG neurons was detected by RT-qPCR at 1, 2, 4 and 6 weeks after the injection. The expression of KCNA2 in the DRG was measured by Western blotting, and the methylation level of Kcna2 promoter region was measured by MSPCR at 4 weeks after the injection. RESULTS The PWMT of the rats in OA group was significantly decreased at 2, 4, and 6 weeks after the injection as compared with the baseline (P < 0.05 or P < 0.001) as well as the control group (P < 0.05 or P < 0.001). Four weeks after the intra-articular injection, fractures and defects on the surface of the articular cartilage, bone hyperplasia, and blurred tidal line were observed in the rats in OA group, but no obvious pathological changes were detected in the control or saline groups. Compared with those in the control group, the expressions of ATF-3 and iNOS were significantly increased (P < 0.01) at 4 weeks after injection; the expression of Kcna2 mRNA at 2, 4 and 6 weeks and the expression of KCNA2 protein at 4 weeks were all significantly decreased (P < 0.05 or P < 0.01), and the methylation level of Kcna2 gene was significantly increased at 4 weeks after the injection in OA group (P < 0.01). CONCLUSIONS The expression of KCNA2 is decreased in the DRG neurons of rats with OA pain likely as a result of enhanced methylation of Kcna2 promoter region.
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Wu Q, Wei G, Ji F, Jia S, Wu S, Guo X, He L, Pan Z, Miao X, Mao Q, Yang Y, Cao M, Tao YX. TET1 Overexpression Mitigates Neuropathic Pain Through Rescuing the Expression of μ-Opioid Receptor and Kv1.2 in the Primary Sensory Neurons. Neurotherapeutics 2019; 16:491-504. [PMID: 30515739 PMCID: PMC6554405 DOI: 10.1007/s13311-018-00689-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Peripheral nerve injury downregulates the expression of the μ-opioid receptor (MOR) and voltage-gated potassium channel subunit Kv1.2 by increasing their DNA methylation in the dorsal root ganglion (DRG). Ten-eleven translocation methylcytosine dioxygenase 1 (TET1) causes DNA demethylation. Given that DRG MOR and Kv1.2 downregulation contribute to neuropathic pain genesis, this study investigated the effect of DRG TET1 overexpression on neuropathic pain. Overexpression of TET1 in the DRG through microinjection of herpes simplex virus expressing full-length TET1 mRNA into the injured rat DRG significantly alleviated the fifth lumbar spinal nerve ligation (SNL)-induced pain hypersensitivities during the development and maintenance periods, without altering acute pain or locomotor function. This microinjection also restored morphine analgesia and attenuated morphine analgesic tolerance development after SNL. Mechanistically, TET1 microinjection rescued the expression of MOR and Kv1.2 by reducing the level of 5-methylcytosine and increasing the level of 5-hydroxymethylcytosine in the promoter and 5' untranslated regions of the Oprml1 gene (encoding MOR) and in the promoter region of the Kcna2 gene (encoding Kv1.2) in the DRG ipsilateral to SNL. These findings suggest that DRG TET1 overexpression mitigated neuropathic pain likely through rescue of MOR and Kv1.2 expression in the ipsilateral DRG. Virus-mediated DRG delivery of TET1 may open a new avenue for neuropathic pain management.
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Affiliation(s)
- Qiang Wu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, Guangdong, China
| | - Guihua Wei
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
- Department of Pharmacy, Institute of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China
| | - Fengtao Ji
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, Guangdong, China
| | - Shushan Jia
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
- Department of Anesthesiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, 264003, Shandong, China
| | - Shaogen Wu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Xinying Guo
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Long He
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Zhiqiang Pan
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Xuerong Miao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Qingxiang Mao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Yong Yang
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA
| | - Minghui Cao
- Department of Anesthesiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, Guangdong, China.
| | - Yuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 S. Orange Ave., MSB, E-661, Newark, NJ, 07103, USA.
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Mao Q, Wu S, Gu X, Du S, Mo K, Sun L, Cao J, Bekker A, Chen L, Tao YX. DNMT3a-triggered downregulation of K 2p 1.1 gene in primary sensory neurons contributes to paclitaxel-induced neuropathic pain. Int J Cancer 2019; 145:2122-2134. [PMID: 30684388 DOI: 10.1002/ijc.32155] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 12/18/2018] [Accepted: 01/21/2019] [Indexed: 12/26/2022]
Abstract
Antineoplastic drugs induce dramatic transcriptional changes in dorsal root ganglion (DRG) neurons, which may contribute to chemotherapy-induced neuropathic pain. K2p 1.1 controls neuronal excitability by setting the resting membrane potential. Here, we report that systemic injection of the chemotherapy agent paclitaxel time-dependently downregulates the expression of K 2p 1.1 mRNA and its coding K2p 1.1 protein in the DRG neurons. Rescuing this downregulation mitigates the development and maintenance of paclitaxel-induced mechanical allodynia and heat hyperalgesia. Conversely, in the absence of paclitaxel administration, mimicking this downregulation decreases outward potassium current and increases excitability in the DRG neurons, leading to the enhanced responses to mechanical and heat stimuli. Mechanically, the downregulation of DRG K 2p 1.1 mRNA is attributed to paclitaxel-induced increase in DRG DNMT3a, as blocking this increase reverses the paclitaxel-induced the decrease of DRG K2p 1.1 and mimicking this increase reduces DRG K2p 1.1 expression. In addition, paclitaxel injection increases the binding of DNMT3a to the K 2p 1.1 gene promoter region and elevates the level of DNA methylation within this region in the DRG. These findings suggest that DNMT3a-triggered downregulation of DRG K2p 1.1 may contribute to chemotherapy-induced neuropathic pain.
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Affiliation(s)
- Qingxiang Mao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ.,Department of Anesthesiology, Daping Hospital, Institute of Surgery Research, Third Military Medical University (Army Medical University), Chongqing, China
| | - Shaogen Wu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
| | - Xiyao Gu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
| | - Shibin Du
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
| | - Kai Mo
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
| | - Linlin Sun
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
| | - Jing Cao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ.,Neuroscience Research Institute, Zhengzhou University Academy of Medical Sciences, Zhengzhou, Henan, China
| | - Alex Bekker
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
| | - Liyong Chen
- Department of Anesthesiology, Daping Hospital, Institute of Surgery Research, Third Military Medical University (Army Medical University), Chongqing, China
| | - Yuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ
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54
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Yuan J, Wen J, Wu S, Mao Y, Mo K, Li Z, Su S, Gu H, Ai Y, Bekker A, Zhang W, Tao YX. Contribution of dorsal root ganglion octamer transcription factor 1 to neuropathic pain after peripheral nerve injury. Pain 2019; 160:375-384. [PMID: 30247265 PMCID: PMC6344274 DOI: 10.1097/j.pain.0000000000001405] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Neuropathic pain genesis is related to gene alterations in the dorsal root ganglion (DRG) after peripheral nerve injury. Transcription factors control gene expression. In this study, we investigated whether octamer transcription factor 1 (OCT1), a transcription factor, contributed to neuropathic pain caused by chronic constriction injury (CCI) of the sciatic nerve. Chronic constriction injury produced a time-dependent increase in the level of OCT1 protein in the ipsilateral L4/5 DRG, but not in the spinal cord. Blocking this increase through microinjection of OCT1 siRNA into the ipsilateral L4/5 DRG attenuated the initiation and maintenance of CCI-induced mechanical allodynia, heat hyperalgesia, and cold allodynia and improved morphine analgesia after CCI, without affecting basal responses to acute mechanical, heat, and cold stimuli as well as locomotor functions. Mimicking this increase through microinjection of recombinant adeno-associated virus 5 harboring full-length OCT1 into the unilateral L4/5 DRG led to marked mechanical allodynia, heat hyperalgesia, and cold allodynia in naive rats. Mechanistically, OCT1 participated in CCI-induced increases in Dnmt3a mRNA and its protein and DNMT3a-mediated decreases in Oprm1 and Kcna2 mRNAs and their proteins in the injured DRG. These findings indicate that OCT1 may participate in neuropathic pain at least in part by transcriptionally activating Dnmt3a and subsequently epigenetic silencing of Oprm1 and Kcan2 in the DRG. OCT1 may serve as a potential target for therapeutic treatments against neuropathic pain.
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MESH Headings
- Analgesics, Opioid/pharmacology
- Analgesics, Opioid/therapeutic use
- Animals
- DNA (Cytosine-5-)-Methyltransferases/metabolism
- DNA Methyltransferase 3A
- Disease Models, Animal
- Ganglia, Spinal/drug effects
- Ganglia, Spinal/metabolism
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/physiology
- Glial Fibrillary Acidic Protein/metabolism
- Hyperalgesia/drug therapy
- Hyperalgesia/etiology
- Kv1.2 Potassium Channel/metabolism
- Male
- Microinjections
- Morphine/therapeutic use
- Octamer Transcription Factor-1/genetics
- Octamer Transcription Factor-1/metabolism
- Pain Measurement/drug effects
- Pain Threshold/drug effects
- Pain Threshold/physiology
- RNA, Messenger/metabolism
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptors, Opioid, mu/genetics
- Receptors, Opioid, mu/metabolism
- Sciatica/complications
- Sciatica/drug therapy
- Sciatica/pathology
- Signal Transduction/drug effects
- Transduction, Genetic
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Affiliation(s)
- Jingjing Yuan
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Jing Wen
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Shaogen Wu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Yuanyuan Mao
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Kai Mo
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Zhisong Li
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
- Neuroscience Research Institute, Zhengzhou University Academy of Medical Sciences, Zhengzhou, Henan 45001, China
| | - Songxue Su
- Neuroscience Research Institute, Zhengzhou University Academy of Medical Sciences, Zhengzhou, Henan 45001, China
| | - Hanwen Gu
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
| | - Yanqiu Ai
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
- Neuroscience Research Institute, Zhengzhou University Academy of Medical Sciences, Zhengzhou, Henan 45001, China
| | - Alex Bekker
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Wei Zhang
- Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
- Neuroscience Research Institute, Zhengzhou University Academy of Medical Sciences, Zhengzhou, Henan 45001, China
| | - Yuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
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Oliveira AMM, Litke C, Paldy E, Hagenston AM, Lu J, Kuner R, Bading H, Mauceri D. Epigenetic control of hypersensitivity in chronic inflammatory pain by the de novo DNA methyltransferase Dnmt3a2. Mol Pain 2019; 15:1744806919827469. [PMID: 30638145 PMCID: PMC6362517 DOI: 10.1177/1744806919827469] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 01/07/2019] [Indexed: 01/08/2023] Open
Abstract
Chronic pain is a pathological manifestation of neuronal plasticity supported by altered gene transcription in spinal cord neurons that results in long-lasting hypersensitivity. Recently, the concept that epigenetic regulators might be important in pathological pain has emerged, but a clear understanding of the molecular players involved in the process is still lacking. In this study, we linked Dnmt3a2, a synaptic activity-regulated de novo DNA methyltransferase, to chronic inflammatory pain. We observed that Dnmt3a2 levels are increased in the spinal cord of adult mice following plantar injection of Complete Freund's Adjuvant, an in vivo model of chronic inflammatory pain. In vivo knockdown of Dnmt3a2 expression in dorsal horn neurons blunted the induction of genes triggered by Complete Freund's Adjuvant injection. Among the genes whose transcription was found to be influenced by Dnmt3a2 expression in the spinal cord is Ptgs2, encoding for Cox-2, a prime mediator of pain processing. Lowering the levels of Dnmt3a2 prevented the establishment of long-lasting inflammatory hypersensitivity. These results identify Dnmt3a2 as an important epigenetic regulator needed for the establishment of central sensitization. Targeting expression or function of Dnmt3a2 may be suitable for the treatment of chronic pain.
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Affiliation(s)
- Ana MM Oliveira
- Department of Neurobiology, Interdisciplinary Centre for
Neurosciences, Heidelberg University, Heidelberg, Germany
| | - Christian Litke
- Department of Neurobiology, Interdisciplinary Centre for
Neurosciences, Heidelberg University, Heidelberg, Germany
| | - Eszter Paldy
- Institute of Pharmacology, Heidelberg University, Heidelberg,
Germany
| | - Anna M Hagenston
- Department of Neurobiology, Interdisciplinary Centre for
Neurosciences, Heidelberg University, Heidelberg, Germany
| | - Jianning Lu
- Institute of Pharmacology, Heidelberg University, Heidelberg,
Germany
| | - Rohini Kuner
- Institute of Pharmacology, Heidelberg University, Heidelberg,
Germany
| | - Hilmar Bading
- Department of Neurobiology, Interdisciplinary Centre for
Neurosciences, Heidelberg University, Heidelberg, Germany
| | - Daniela Mauceri
- Department of Neurobiology, Interdisciplinary Centre for
Neurosciences, Heidelberg University, Heidelberg, Germany
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MBD1 Contributes to the Genesis of Acute Pain and Neuropathic Pain by Epigenetic Silencing of Oprm1 and Kcna2 Genes in Primary Sensory Neurons. J Neurosci 2018; 38:9883-9899. [PMID: 30266739 DOI: 10.1523/jneurosci.0880-18.2018] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 09/12/2018] [Accepted: 09/24/2018] [Indexed: 02/06/2023] Open
Abstract
The transmission of normal sensory and/or acute noxious information requires intact expression of pain-associated genes within the pain pathways of nervous system. Expressional changes of these genes after peripheral nerve injury are also critical for neuropathic pain induction and maintenance. Methyl-CpG-binding domain protein 1 (MBD1), an epigenetic repressor, regulates gene transcriptional activity. We report here that MBD1 in the primary sensory neurons of DRG is critical for the genesis of acute pain and neuropathic pain as DRG MBD1-deficient mice exhibit the reduced responses to acute mechanical, heat, cold, and capsaicin stimuli and the blunted nerve injury-induced pain hypersensitivities. Furthermore, DRG overexpression of MBD1 leads to spontaneous pain and evoked pain hypersensitivities in the WT mice and restores acute pain sensitivities in the MBD1-deficient mice. Mechanistically, MDB1 represses Oprm1 and Kcna2 gene expression by recruiting DNA methyltransferase DNMT3a into these two gene promoters in the DRG neurons. DRG MBD1 is likely a key player under the conditions of acute pain and neuropathic pain.SIGNIFICANCE STATEMENT In the present study, we revealed that the mice with deficiency of methyl-CpG-binding domain protein 1 (MBD1), an epigenetic repressor, in the DRG displayed the reduced responses to acute noxious stimuli and the blunted neuropathic pain. We also showed that DRG overexpression of MBD1 produced the hypersensitivities to noxious stimuli in the WT mice and rescued acute pain sensitivities in the MBD1-deficient mice. We have also provided the evidence that MDB1 represses Oprm1 and Kcna2 gene expression by recruiting DNA methyltransferase DNMT3a into these two gene promoters in the DRG neurons. DRG MBD1 may participate in the genesis of acute pain and neuropathic pain likely through regulating DNMT3a-controlled Oprm1 and Kcna2 gene expression in the DRG neurons.
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Saunders J, Hore Z, Gentry C, McMahon S, Denk F. Negative Evidence for a Functional Role of Neuronal DNMT3a in Persistent Pain. Front Mol Neurosci 2018; 11:332. [PMID: 30258352 PMCID: PMC6143791 DOI: 10.3389/fnmol.2018.00332] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 08/27/2018] [Indexed: 11/13/2022] Open
Abstract
Traditionally, neuroscience has had to rely on mixed tissue analysis to examine transcriptional and epigenetic changes in the context of nervous system function or pathology. However, particularly when studying chronic pain conditions, this approach can be flawed, since it neglects to take into account the shifting contribution of different cell types across experimental conditions. Here, we demonstrate this using the example of DNA methyltransferases (DNMTs) – a group of epigenetic modifiers consisting of Dnmt1, Dnmt3a, and Dnmt3b in mammalian cells. We used sensory neuron-specific knockout mice for Dnmt3a/3b as well as pharmacological blockade of Dnmt1 to study their role in nociception. In contrast to previous analyses on whole tissue, we find that Dnmt3a and 3b protein is not expressed in adult DRG neurons, that none of the DNA methyltransferases are regulated with injury and that interfering with their function has no effect on nociception. Our results therefore currently do not support a role for neuronal DNA methyltransferases in pain processing in adult animals.
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Affiliation(s)
- Jessica Saunders
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - Zoe Hore
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - Clive Gentry
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - Stephen McMahon
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - Franziska Denk
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
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Miao XR, Fan LC, Wu S, Mao Q, Li Z, Lutz B, Xu JT, Lu Z, Tao YX. DNMT3a contributes to the development and maintenance of bone cancer pain by silencing Kv1.2 expression in spinal cord dorsal horn. Mol Pain 2018; 13:1744806917740681. [PMID: 29056068 PMCID: PMC5676500 DOI: 10.1177/1744806917740681] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Metastatic bone tumor-induced changes in gene transcription and translation in pain-related regions of the nervous system may participate in the development and maintenance of bone cancer pain. Epigenetic modifications including DNA methylation regulate gene transcription. Here, we report that intrathecal injection of decitabine, a DNA methyltransferase (DNMT) inhibitor, dose dependently attenuated the development and maintenance of bone cancer pain induced by injecting prostate cancer cells into the tibia. The level of the de novo DNMT3a, but not DNMT3b, time dependently increased in the ipsilateral L4/5 dorsal horn (not L4/5 dorsal root ganglion) after prostate cancer cells injection. Blocking this increase through microinjection of recombinant adeno-associated virus 5 (AAV5) expressing Dnmt3a shRNA into dorsal horn rescued prostate cancer cells-induced downregulation of dorsal horn Kv1.2 expression and impaired prostate cancer cells-induced pain hypersensitivity. In turn, mimicking this increase through microinjection of AAV5 expressing full-length Dnmt3a into dorsal horn reduced dorsal horn Kv1.2 expression and produced pain hypersensitivity in the absence of prostate cancer cells injection. Administration of neither decitabine nor virus affected locomotor function and acute responses to mechanical, thermal, or cold stimuli. Given that Dnmt3a mRNA is co-expressed with Kcna2 mRNA (encoding Kv1.2) in individual dorsal horn neurons, our findings suggest that increased dorsal horn DNMT3a contributes to bone cancer pain through silencing dorsal horn Kv1.2 expression. DNMT3a may represent a potential new target for cancer pain management.
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Affiliation(s)
| | | | | | - Qingxiang Mao
- Xinqiao Hospital, The Third Military Medical University
| | | | | | | | - Zhijie Lu
- Eastern Hepatobiliary Surgery Hospital, Second Military Medical University
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59
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Kononenko O, Mityakina I, Galatenko V, Watanabe H, Bazov I, Gerashchenko A, Sarkisyan D, Iatsyshyna A, Yakovleva T, Tonevitsky A, Marklund N, Ossipov MH, Bakalkin G. Differential effects of left and right neuropathy on opioid gene expression in lumbar spinal cord. Brain Res 2018; 1695:78-83. [DOI: 10.1016/j.brainres.2018.05.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/23/2018] [Accepted: 05/27/2018] [Indexed: 12/17/2022]
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60
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Wang W, Li C, Cai Y, Pan ZZ. Pain vulnerability and DNA methyltransferase 3a involved in the affective dimension of chronic pain. Mol Pain 2018; 13:1744806917726713. [PMID: 28849714 PMCID: PMC5580851 DOI: 10.1177/1744806917726713] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Chronic pain with comorbid emotional disorders is a prevalent neurological disease in patients under various pathological conditions, yet patients show considerable difference in their vulnerability to developing chronic pain. Understanding the neurobiological basis underlying this pain vulnerability is essential to develop targeted therapies of higher efficiency in pain treatment of precision medicine. However, this pain vulnerability has not been addressed in preclinical pain research in animals to date. In this study, we investigated individual variance in both sensory and affective/emotional dimensions of pain behaviors in response to chronic neuropathic pain condition in a mouse model of chronic pain. We found that mice displayed considerably diverse sensitivities in the chronic pain-induced anxiety- and depression-like behaviors of affective pain. Importantly, the mouse group that was more vulnerable to developing anxiety was also more vulnerable to developing depressive behavior under the chronic pain condition. In contrast, there was relatively much less variance in individual responses in the sensory dimension of pain sensitization. Molecular analysis revealed that those mice vulnerable to developing the emotional disorders showed a significant reduction in the protein level of DNA methyltransferase 3a in the emotion-processing central nucleus of the amygdala. In addition, social stress also revealed significant individual variance in anxiety behavior in mice. These findings suggest that individual pain vulnerability may be inherent mostly in the emotional/affective component of chronic pain and remain consistent in different aspects of negative emotion, in which adaptive changes in the function of DNA methyltransferase 3a for DNA methylation in central amygdala may play an important role. This may open a new avenue of basic research into the neurobiological mechanisms underlying pain vulnerability.
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Affiliation(s)
- Wei Wang
- 1 Department of Anesthesiology and Pain Medicine, 4002 The University of Texas MD Anderson Cancer Center , Houston, TX, USA
| | - Caiyue Li
- 1 Department of Anesthesiology and Pain Medicine, 4002 The University of Texas MD Anderson Cancer Center , Houston, TX, USA
| | - Youqing Cai
- 1 Department of Anesthesiology and Pain Medicine, 4002 The University of Texas MD Anderson Cancer Center , Houston, TX, USA
| | - Zhizhong Z Pan
- 1 Department of Anesthesiology and Pain Medicine, 4002 The University of Texas MD Anderson Cancer Center , Houston, TX, USA
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Penas C, Navarro X. Epigenetic Modifications Associated to Neuroinflammation and Neuropathic Pain After Neural Trauma. Front Cell Neurosci 2018; 12:158. [PMID: 29930500 PMCID: PMC5999732 DOI: 10.3389/fncel.2018.00158] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 05/22/2018] [Indexed: 12/20/2022] Open
Abstract
Accumulating evidence suggests that epigenetic alterations lie behind the induction and maintenance of neuropathic pain. Neuropathic pain is usually a chronic condition caused by a lesion, or pathological change, within the nervous system. Neuropathic pain appears frequently after nerve and spinal cord injuries or diseases, producing a debilitation of the patient and a decrease of the quality of life. At the cellular level, neuropathic pain is the result of neuronal plasticity shaped by an increase in the sensitivity and excitability of sensory neurons of the central and peripheral nervous system. One of the mechanisms thought to contribute to hyperexcitability and therefore to the ontogeny of neuropathic pain is the altered expression, trafficking, and functioning of receptors and ion channels expressed by primary sensory neurons. Besides, neuronal and glial cells, such as microglia and astrocytes, together with blood borne macrophages, play a critical role in the induction and maintenance of neuropathic pain by releasing powerful neuromodulators such as pro-inflammatory cytokines and chemokines, which enhance neuronal excitability. Altered gene expression of neuronal receptors, ion channels, and pro-inflammatory cytokines and chemokines, have been associated to epigenetic adaptations of the injured tissue. Within this review, we discuss the involvement of these epigenetic changes, including histone modifications, DNA methylation, non-coding RNAs, and alteration of chromatin modifiers, that have been shown to trigger modification of nociception after neural lesions. In particular, the function on these processes of EZH2, JMJD3, MeCP2, several histone deacetylases (HDACs) and histone acetyl transferases (HATs), G9a, DNMT, REST and diverse non-coding RNAs, are described. Despite the effort on developing new therapies, current treatments have only produced limited relief of this pain in a portion of patients. Thus, the present review aims to contribute to find novel targets for chronic neuropathic pain treatment.
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Affiliation(s)
- Clara Penas
- Institut de Neurociències, Departament de Biologia Cellular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
| | - Xavier Navarro
- Institut de Neurociències, Departament de Biologia Cellular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
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62
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Opioid Exposure is Associated with Aberrant DNA Methylation of OPRM1 Promoter Region in a Chinese Han Population. Biochem Genet 2018; 56:451-458. [DOI: 10.1007/s10528-018-9852-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 03/01/2018] [Indexed: 12/30/2022]
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63
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Abstract
Neuropathic pain is the result of neuroplastic and neuroinflammatory changes from trauma or diseases that damage the somatosensory system. Cancer-related neuropathic pain is caused by treatment, cancer, or paraneoplastic reactions to cancer. Approximately 30% of patients with cancer have neuropathic pain, mostly mixed nociceptive and neuropathic pain. History, physical examination, quantitative sensory testing, skin punch biopsies, and functional MRIs help to divide pain into phenotypes that may facilitate analgesic choices. Guidelines for treating cancer-related neuropathic pain are not consistent and are highly dependent on trials in patients without cancer. Combinations of analgesics are promising, whereas evidence for cannabinoids is meager.
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Affiliation(s)
- Mellar P Davis
- Department of Palliative Care, Geisinger Medical Center, 100 North Academy Avenue, Danville, PA 17822, USA.
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64
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Xu B, Cao J, Zhang J, Jia S, Wu S, Mo K, Wei G, Liang L, Miao X, Bekker A, Tao YX. Role of MicroRNA-143 in Nerve Injury-Induced Upregulation of Dnmt3a Expression in Primary Sensory Neurons. Front Mol Neurosci 2017; 10:350. [PMID: 29170626 PMCID: PMC5684171 DOI: 10.3389/fnmol.2017.00350] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Accepted: 10/13/2017] [Indexed: 12/02/2022] Open
Abstract
Peripheral nerve injury increased the expression of the DNA methyltransferase 3A (Dnmt3a) mRNA and its encoding Dnmt3a protein in injured dorsal root ganglia (DRG). This increase is considered as an endogenous instigator in neuropathic pain genesis through epigenetic silencing of pain-associated genes (such as Oprm1) in injured DRG. However, how DRG DNMT3a is increased following peripheral nerve injury is still elusive. We reported here that peripheral nerve injury caused by the fifth spinal nerve ligation (SNL) downregulated microRNA (miR)-143 expression in injured DRG. This downregulation was required for SNL-induced DRG Dnmt3a increase as rescuing miR-143 downregulation through microinjection of miR-143 mimics into injured DRG blocked the SNL-induced increase in Dnmt3a and restored the SNL-induced decreases in Oprm1 mRNA and its encoding mu opioid receptor (MOR) in injured DRG, impaired spinal cord central sensitization and neuropathic pain, and improved morphine analgesic effects following SNL. Mimicking SNL-induced DRG miR-143 downregulation through DRG microinjection of miR143 inhibitors in naive rats increased the expression of Dnmt3a and reduced the expression of Oprm1 mRNA and MOR in injected DRG and produced neuropathic pain-like symptoms. These findings suggest that miR-143 is a negative regulator in Dnmt3a expression in the DRG under neuropathic pain conditions and may be a potential target for therapeutic management of neuropathic pain.
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Affiliation(s)
- Bo Xu
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States.,Department of Anesthesiology, General Hospital of Guangzhou Military Command, Guangzhou, China
| | - Jing Cao
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States.,Neuroscience Research Institute, College of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Jun Zhang
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States.,Department of Anesthesiology, Union Medical Center, Tianjin, China
| | - Shushan Jia
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States.,Department of Anesthesiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, China
| | - Shaogen Wu
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
| | - Kai Mo
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
| | - Guihua Wei
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
| | - Lingli Liang
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
| | - Xuerong Miao
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
| | - Alex Bekker
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
| | - Yuan-Xiang Tao
- Department of Anesthesiology, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States.,Neuroscience Research Institute, College of Basic Medicine, Zhengzhou University, Zhengzhou, China.,Departments of Cell Biology & Molecular Medicine and Physiology, Pharmacology & Neuroscience, Rutgers New Jersey Medical School, The State University of New Jersey, Newark, NJ, United States
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65
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Di Cesare Mannelli L, Ghelardini C, Micheli L, Del Bello F, Giannella M, Piergentili A, Pigini M, Quaglia W. Synergic stimulation of serotonin 5-HT1A receptor and α2-adrenoceptors for neuropathic pain relief: Preclinical effects of 2-substituted imidazoline derivatives. Eur J Pharmacol 2017. [DOI: 10.1016/j.ejphar.2017.06.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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66
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Li Z, Mao Y, Liang L, Wu S, Yuan J, Mo K, Cai W, Mao Q, Cao J, Bekker A, Zhang W, Tao YX. The transcription factor C/EBPβ in the dorsal root ganglion contributes to peripheral nerve trauma-induced nociceptive hypersensitivity. Sci Signal 2017; 10:10/487/eaam5345. [PMID: 28698219 DOI: 10.1126/scisignal.aam5345] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Changes in gene transcription in the dorsal root ganglion (DRG) after nerve trauma contribute to the genesis of neuropathic pain. We report that peripheral nerve trauma caused by chronic constriction injury (CCI) increased the abundance of the transcription factor C/EBPβ (CCAAT/enhancer binding protein β) in the DRG. Blocking this increase mitigated the development and maintenance of CCI-induced mechanical, thermal, and cold pain hypersensitivities without affecting basal responses to acute pain and locomotor activity. Conversely, mimicking this increase produced hypersensitivity to mechanical, thermal, or cold pain. In the ipsilateral DRG, C/EBPβ promoted a decrease in the abundance of the voltage-gated potassium channel subunit Kv1.2 and μ opioid receptor (MOR) at the mRNA and protein levels, which would be predicted to increase excitability in the ipsilateral DRG neurons and reduce the efficacy of morphine analgesia. These effects required C/EPBβ-mediated transcriptional activation of Ehmt2 (euchromatic histone-lysine N-methyltransferase 2), which encodes G9a, an epigenetic silencer of the genes encoding Kv1.2 and MOR. Blocking the increase in C/EBPβ in the DRG improved morphine analgesia after CCI. These results suggest that C/EBPβ is an endogenous initiator of neuropathic pain and could be a potential target for the prevention and treatment of this disorder.
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Affiliation(s)
- Zhisong Li
- Department of Anesthesiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China.,Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Yuanyuan Mao
- Department of Anesthesiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China.,Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Lingli Liang
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Shaogen Wu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Jingjing Yuan
- Department of Anesthesiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China.,Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Kai Mo
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Weihua Cai
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA.,Pain Research Institute, College of Basic Medicine, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Qingxiang Mao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Jing Cao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA.,Pain Research Institute, College of Basic Medicine, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Alex Bekker
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Wei Zhang
- Department of Anesthesiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China.
| | - Yuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA.,Department of Anesthesiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China. .,Departments of Cell Biology and Molecular Medicine and Physiology, Pharmacology, and Neuroscience, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
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