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Soma K, Hitomi S, Hayashi Y, Soma C, Otsuji J, Shibuta I, Furukawa A, Urata K, Kurisu R, Yonemoto M, Hojo Y, Shirakawa T, Iwata K, Shinoda M. Neonatal injury modulates incisional pain sensitivity in adulthood: An animal study. Neuroscience 2023; 519:60-72. [PMID: 36958596 DOI: 10.1016/j.neuroscience.2023.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 02/02/2023] [Accepted: 03/15/2023] [Indexed: 03/25/2023]
Abstract
Neonatal pain experiences including traumatic injury influences negatively on development of nociceptive circuit developments, resulting in persistent pain hypersensitivity in adults. However, the detailed mechanism is not yet well understood. In the present study, to clarify the pathogenesis of orofacial pain hypersensitivity associated with neonatal injury, the involvement of the voltage-gated sodium channel (Nav) 1.8 and the C-C chemokine ligand 2 (CCL2)/C-C chemokine receptor 2 (CCR2) signaling in the trigeminal ganglion (TG) in facial skin incisional pain hypersensitivity was examined in 190 neonatal facial-injured and sham male rats. The whisker pad skin was incised on postnatal day 4 and week 7 (Incision-Incision group). Compared to the group without neonatal incision (Sham-Incision group), mechanical hypersensitivity in the whisker pad skin was enhanced in Incision-Incision group. The number of Nav1.8-immunoreactive TG neurons and the amount of CCL2 expressed in the macrophages and satellite glial cells in the TG were increased on day 14 after re-incision in the Incision-Incision group, compared with Sham-Incision group. Blockages of Nav1.8 in the incised region and CCR2 in the TG suppressed the enhancement of mechanical hypersensitivity in the Incision-Incision group. Administration of CCL2 into the TG enhanced mechanical hypersensitivity in the Sham-Sham, Incision-Sham and Sham-Incision group. Our results suggest that neonatal facial injury accelerates the TG neuronal hyperexcitability following orofacial skin injury in adult in association with Nav1.8 overexpression via CCL2 signaling, resulting in the enhancement of orofacial incisional pain hypersensitivity in the adulthood.
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Affiliation(s)
- Kumi Soma
- Department of Pediatric Dentistry, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Suzuro Hitomi
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan.
| | - Yoshinori Hayashi
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Chihiro Soma
- Department of Pediatric Dentistry, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan; Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Jo Otsuji
- Department of Pediatric Dentistry, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan; Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Ikuko Shibuta
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Akihiko Furukawa
- Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Kentaro Urata
- Department of Complete Denture Prosthodontics, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Ryoko Kurisu
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan; Department of Orofacial Pain Clinic, Tokyo Medical and Dental University Hospital, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Mamiko Yonemoto
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Yasushi Hojo
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Tetsuo Shirakawa
- Department of Pediatric Dentistry, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Koichi Iwata
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
| | - Masamichi Shinoda
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo, 101-8310, Japan
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Zhang J, Si J, Liang R, Lu Y, Shang H, Li X, Sun S, Wu LA. Ligand-gated ion channel P2X7 regulates hypoxia-induced factor-1α mediated pain induced by dental pulpitis in the medullary dorsal horn. Front Mol Neurosci 2022; 15:1015751. [PMID: 36385758 PMCID: PMC9644926 DOI: 10.3389/fnmol.2022.1015751] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 09/27/2022] [Indexed: 12/02/2022] Open
Abstract
Dental pulpitis often induces severe pain, and the molecular immune response is remarkable in both peripheral and central nervous system. Accumulating evidence indicates that activated microglia in the medullary dorsal horn (MDH) contribute to dental pulpitis induced pain. The P2X7 receptor plays an important role in driving pain and inflammatory processes, and its downstream target hypoxia-induced factor-1α (HIF-1α) has a crucial role in maintaining inflammation. However, the relationship between P2X7 and HIF-1α in dental inflammatory pain remains unclear. This study demonstrated that the degree of inflammation in the dental pulp tissue became more severe in a time-dependent manner by establishing a rat dental pulpitis model via pulp exposure. Meanwhile, the expression of P2X7, HIF-1α, IL-1β, and IL-18 in the MDH increased most on the seventh day when the pain threshold was the lowest in the dental pulpitis model. Furthermore, lipopolysaccharides (LPS) increased P2X7-mediated HIF-1α expression in microglia. Notably, the suppression of P2X7 caused less IL-1β and IL-18 release and lower HIF-1α expression, and P2X7 antagonist Brilliant Blue G (BBG) could alleviate pain behaviors of the dental pulpitis rats. In conclusion, our results provide further evidence that P2X7 is a key molecule, which regulates HIF-1α expression and inflammation in dental pulpitis-induced pain.
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Affiliation(s)
- Jing Zhang
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Jialin Si
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Rongrong Liang
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
- College of Life Sciences, Northwest University, Xi’an, China
| | - Yuxin Lu
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Hongwei Shang
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Xinwei Li
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Shukai Sun
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
- *Correspondence: Shukai Sun,
| | - Li-an Wu
- State Key Laboratory of Military Stomatology, Department of Pediatric Dentistry, National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi’an, China
- Li-an Wu,
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Oliveira JP, Abreu FF, Bispo JMM, Cerqueira ARA, dos Santos JR, Correa CB, Costa SKP, Camargo EA. Myrtenol Reduces Orofacial Nociception and Inflammation in Mice Through p38-MAPK and Cytokine Inhibition. Front Pharmacol 2022; 13:910219. [PMID: 35712716 PMCID: PMC9196033 DOI: 10.3389/fphar.2022.910219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 05/03/2022] [Indexed: 11/24/2022] Open
Abstract
Orofacial pain is one of the commonest and most complex complaints in dentistry, greatly impairing life quality. Preclinical studies using monoterpenes have shown pharmacological potential to treat painful conditions, but the reports of the effects of myrtenol on orofacial pain and inflammation are scarce. The aim of this study was to evaluate the effect of myrtenol in experimental models of orofacial pain and inflammation. Orofacial nociceptive behavior and the immunoreactivity of the phosphorylated p38 (P-p38)-MAPK in trigeminal ganglia (TG) and spinal trigeminal subnucleus caudalis (STSC) were determined after the injection of formalin in the upper lip of male Swiss mice pretreated with myrtenol (12.5 and 25 mg/kg, i.p.) or vehicle. Orofacial inflammation was induced by the injection of carrageenan (CGN) in the masseter muscle of mice pretreated with myrtenol (25 and 50 mg/kg, i.p.) or its vehicle (0.02% Tween 80 in saline). Myeloperoxidase (MPO) activity and histopathological changes in the masseter muscle and interleukin (IL)-1β levels in the TG and STSC were measured. The increase in face-rubbing behavior time induced by formalin and P-p38-MAPK immunostaining in trigeminal ganglia were significantly reduced by myrtenol treatment (12.5 and 25 mg/kg). Likewise, increased MPO activity and inflammatory histological scores in masseter muscle, as well as augmented levels of IL-1β in the TG AND STSC, observed after CGN injection, were significantly decreased by myrtenol (25 and 50 mg/kg). Myrtenol has potential to treat orofacial inflammation and pain, which is partially related to IL-1β levels in the trigeminal pathway and p38-MAPK modulation in trigeminal ganglia.
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Affiliation(s)
- Janaíne P. Oliveira
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Department of Pharmacology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Fabíula F. Abreu
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - José Marcos M. Bispo
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Anderson R. A. Cerqueira
- Department of Pharmacology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - José Ronaldo dos Santos
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Department of Biosciences, Federal University of Sergipe, Itabaiana, Brazil
| | - Cristiane B. Correa
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Department of Morphology, Federal University of Sergipe, São Cristóvão, Brazil
| | - Soraia K. P. Costa
- Department of Pharmacology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Enilton A. Camargo
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Department of Physiology, Federal University of Sergipe, São Cristóvão, Brazil
- *Correspondence: Enilton A. Camargo,
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Wang J, Wu XC, Zhang MM, Ren JH, Sun Y, Liu JZ, Wu XQ, He SY, Li YQ, Zhang JB. Spinal cord stimulation reduces cardiac pain through microglial deactivation in rats with chronic myocardial ischemia. Mol Med Rep 2021; 24:835. [PMID: 34608504 PMCID: PMC8503748 DOI: 10.3892/mmr.2021.12475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 09/07/2021] [Indexed: 01/14/2023] Open
Abstract
Angina pectoris is cardiac pain that is a common clinical symptom often resulting from myocardial ischemia. Spinal cord stimulation (SCS) is effective in treating refractory angina pectoris, but its underlying mechanisms have not been fully elucidated. The spinal dorsal horn is the first region of the central nervous system that receives nociceptive information; it is also the target of SCS. In the spinal cord, glial (astrocytes and microglia) activation is involved in the initiation and persistence of chronic pain. Thus, the present study investigated the possible cardiac pain-relieving effects of SCS on spinal dorsal horn glia in chronic myocardial ischemia (CMI). CMI was established by left anterior descending artery ligation surgery, which induced significant spontaneous/ongoing cardiac pain behaviors, as measured using the open field test in rats. SCS effectively improved such behaviors as shown by open field and conditioned place preference tests in CMI model rats. SCS suppressed CMI-induced spinal dorsal horn microglial activation, with downregulation of ionized calcium-binding adaptor protein-1 expression. Moreover, SCS inhibited CMI-induced spinal expression of phosphorylated-p38 MAPK, which was specifically colocalized with the spinal dorsal horn microglia rather than astrocytes and neurons. Furthermore, SCS could depress spinal neuroinflammation by suppressing CMI-induced IL-1β and TNF-α release. Intrathecal administration of minocycline, a microglial inhibitor, alleviated the cardiac pain behaviors in CMI model rats. In addition, the injection of fractalkine (microglia-activating factor) partially reversed the SCS-produced analgesic effects on CMI-induced cardiac pain. These results indicated that the therapeutic mechanism of SCS on CMI may occur partially through the inhibition of spinal microglial p38 MAPK pathway activation. The present study identified a novel mechanism underlying the SCS-produced analgesic effects on chronic cardiac pain.
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Affiliation(s)
- Jian Wang
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China
| | - Xiao-Chen Wu
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China
| | - Ming-Ming Zhang
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Jia-Hao Ren
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Yi Sun
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Jing-Zhen Liu
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China
| | - Xi-Qiang Wu
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China
| | - Si-Yi He
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China
| | - Yun-Qing Li
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Jin-Bao Zhang
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China
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Duan-Mu CL, Zhang XN, Shi H, Su YS, Wan HY, Wang Y, Qu ZY, He W, Wang XY, Jing XH. Electroacupuncture-Induced Muscular Inflammatory Pain Relief Was Associated With Activation of Low-Threshold Mechanoreceptor Neurons and Inhibition of Wide Dynamic Range Neurons in Spinal Dorsal Horn. Front Neurosci 2021; 15:687173. [PMID: 34305519 PMCID: PMC8295590 DOI: 10.3389/fnins.2021.687173] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 06/04/2021] [Indexed: 12/29/2022] Open
Abstract
Acupuncture is an effective alternative therapy for pain management. Evidence suggests that acupuncture relieves pain by exciting somatic afferent nerve fibers. However, the mechanism underlying the interaction between neurons in different layers of the spinal dorsal horn induced by electroacupuncture (EA) remains unclear. The aim of this study was to explore the mechanism of EA relieving inflammatory muscle pain, which was associated with activation of the spontaneous firing of low-threshold mechanoreceptor (LTM) neurons and inhibition of wide dynamic range (WDR) neuronal activities in the spinal dorsal horn of rats. Inflammatory muscle pain was induced by injecting complete Freund’s adjuvant into the right biceps femoris muscle. EA with intensity of threshold of A fibers (Ta) in Liangqiu (ST34) muscle considerably inhibited the abnormal spontaneous activities of electromyography (EMG) due to muscle inflammation. While EA with intensity of C-fiber threshold (Tc) increased the abnormal activities of EMG. EA with Ta also ameliorated the imbalance of weight-bearing behavior. A microelectrode array with 750-μm depth covering 32 channels was used to record the neuronal activities of WDR and LTM in different layers of the spinal dorsal horn. The spontaneous firing of LTM neurons was enhanced by EA-Ta, while the spontaneous firing of WDR neurons was inhibited. Moreover, EA-Ta led to a significant inverse correlation between changes in the frequency of WDR and LTM neurons (r = −0.64, p < 0.05). In conclusion, the results indicated that EA could alleviate inflammatory muscle pain, which was associated with facilitation of the spontaneous firing of LTM neurons and inhibition of WDR neuronal activities. This provides a promising evidence that EA-Ta could be applied to relieve muscular inflammatory pain in clinical practice.
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Affiliation(s)
- Cheng-Lin Duan-Mu
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Xiao-Ning Zhang
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Hong Shi
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yang-Shuai Su
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Hong-Ye Wan
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yi Wang
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Zheng-Yang Qu
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Wei He
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Xiao-Yu Wang
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Xiang-Hong Jing
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
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Chronic Orofacial Pain: Models, Mechanisms, and Genetic and Related Environmental Influences. Int J Mol Sci 2021; 22:ijms22137112. [PMID: 34281164 PMCID: PMC8268972 DOI: 10.3390/ijms22137112] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 12/13/2022] Open
Abstract
Chronic orofacial pain conditions can be particularly difficult to diagnose and treat because of their complexity and limited understanding of the mechanisms underlying their aetiology and pathogenesis. Furthermore, there is considerable variability between individuals in their susceptibility to risk factors predisposing them to the development and maintenance of chronic pain as well as in their expression of chronic pain features such as allodynia, hyperalgesia and extraterritorial sensory spread. The variability suggests that genetic as well as environmental factors may contribute to the development and maintenance of chronic orofacial pain. This article reviews these features of chronic orofacial pain, and outlines findings from studies in animal models of the behavioural characteristics and underlying mechanisms related to the development and maintenance of chronic orofacial pain and trigeminal neuropathic pain in particular. The review also considers the role of environmental and especially genetic factors in these models, focussing on findings of differences between animal strains in the features and underlying mechanisms of chronic pain. These findings are not only relevant to understanding underlying mechanisms and the variability between patients in the development, expression and maintenance of chronic orofacial pain, but also underscore the importance for considering the strain of the animal to model and explore chronic orofacial pain processes.
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Fu J, Mu G, Qiu L, Zhao J, Ou C. c-Abl-p38 α signaling pathway mediates dopamine neuron loss in trigeminal neuralgia. Mol Pain 2021; 16:1744806920930855. [PMID: 32498644 PMCID: PMC7278317 DOI: 10.1177/1744806920930855] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Trigeminal neuralgia is a common neuropathic pain in the head and face. The pathogenesis of trigeminal neuralgia is complex, and so far, the pathogenesis of trigeminal neuralgia involving peripheral and central nervous inflammation theory has not been explained clearly. The loss of dopamine neurons in striatum may play an important role in the development of trigeminal nerve, but the reason is not clear. C-Abl is a nonreceptor tyrosine kinase, which can be activated abnormally in the environment of neuroinflammation and cause neuron death. We found that in the rat model of infraorbital nerve ligation trigeminal neuralgia, the pain threshold decreased, the expression of c-Abl increased significantly, the downstream activation product p38 was also activated abnormally and the loss of dopamine neurons in striatum increased. When treated with imatinib mesylate (STI571), a specific c-Abl family kinase inhibitor, the p38 expression was decreased and the loss of dopaminergic neurons was reduced. The mechanical pain threshold of rats was also improved. In conclusion, c-abl-p38 signaling pathway may play an important role in the pathogenesis of trigeminal neuralgia, and it is one of the potential targets for the treatment of trigeminal neuralgia.
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Affiliation(s)
- Jia Fu
- Department of Pain, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Guo Mu
- Department of Pain, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Ling Qiu
- Department of Pain, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Jiaomei Zhao
- Department of Pain, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Cehua Ou
- Department of Pain, The Affiliated Hospital of Southwest Medical University, Luzhou, China.,Laboratory of Anesthesiology, The Affiliated Hospital of Southwest Medical University, Luzhou, China
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Glia and Orofacial Pain: Progress and Future Directions. Int J Mol Sci 2021; 22:ijms22105345. [PMID: 34069553 PMCID: PMC8160907 DOI: 10.3390/ijms22105345] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/12/2021] [Accepted: 05/14/2021] [Indexed: 12/14/2022] Open
Abstract
Orofacial pain is a universal predicament, afflicting millions of individuals worldwide. Research on the molecular mechanisms of orofacial pain has predominately focused on the role of neurons underlying nociception. However, aside from neural mechanisms, non-neuronal cells, such as Schwann cells and satellite ganglion cells in the peripheral nervous system, and microglia and astrocytes in the central nervous system, are important players in both peripheral and central processing of pain in the orofacial region. This review highlights recent molecular and cellular findings of the glia involvement and glia–neuron interactions in four common orofacial pain conditions such as headache, dental pulp injury, temporomandibular joint dysfunction/inflammation, and head and neck cancer. We will discuss the remaining questions and future directions on glial involvement in these four orofacial pain conditions.
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Matsui T, Hitomi S, Hayashi Y, Shibuta I, Otsuji J, Ando M, Inada T, Soma K, Iwata K, Shirakawa T, Shinoda M. Microglial activation in the trigeminal spinal subnucleus interpolaris/caudalis modulates orofacial incisional mechanical pain hypersensitivity associated with orofacial injury in infancy. J Oral Sci 2021; 63:170-173. [PMID: 33731507 DOI: 10.2334/josnusd.20-0648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
PURPOSE Infantile tissue injury induces sensory deficits in adulthood. Infantile facial incision (IFI) was reported to cause an enhancement of incision-induced mechanical hypersensitivity in adulthood due to acceleration of the trigeminal ganglion neuronal excitability. However, the effects of IFI on activation of microglia in the spinal trigeminal nucleus and its involvement in facial pain sensitivity is not well known. METHODS A facial skin incision was made in the left whisker pad in infant (IFI) and/or adult rats (AFI). Mechanical head withdrawal threshold and microglial activation in the trigeminal spinal nucleus were analyzed. RESULTS Mechanical pain hypersensitivity induced by AFI was significantly exacerbated and prolonged by IFI. The number of Iba1-immunoreactive cells in the trigeminal spinal nucleus following AFI was increased by IFI, suggesting that IFI facilitates microglial hyperactivation following AFI. Intraperitoneal administration of minocycline, a microglial activation inhibitor, suppressed the facial incision-induced microglial hyperactivation in the trigeminal spinal nucleus and the exacerbation of the facial mechanical pain hypersensitivity induced by IFI. CONCLUSION These results suggest that facial trauma in infants causes hyperactivation of microglia in the trigeminal spinal nucleus following AFI, leading to the prolongation of the facial mechanical pain hypersensitivity.
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Affiliation(s)
- Tomoyuki Matsui
- Department of Pediatric Dentistry, Nihon University School of Dentistry
| | - Suzuro Hitomi
- Department of Physiology, Nihon University School of Dentistry
| | | | - Ikuko Shibuta
- Department of Physiology, Nihon University School of Dentistry
| | - Jo Otsuji
- Department of Pediatric Dentistry, Nihon University School of Dentistry
| | - Masatoshi Ando
- Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry
| | - Takanobu Inada
- Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry
| | - Kumi Soma
- Department of Pediatric Dentistry, Nihon University School of Dentistry
| | - Koichi Iwata
- Department of Physiology, Nihon University School of Dentistry
| | - Tetsuo Shirakawa
- Department of Pediatric Dentistry, Nihon University School of Dentistry
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Mai L, Zhu X, Huang F, He H, Fan W. p38 mitogen-activated protein kinase and pain. Life Sci 2020; 256:117885. [PMID: 32485175 DOI: 10.1016/j.lfs.2020.117885] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 05/23/2020] [Accepted: 05/28/2020] [Indexed: 12/18/2022]
Abstract
Inflammatory and neuropathic pain is initiated by tissue inflammation and nerve injury, respectively. Both are characterized by increased activity in the peripheral and central nervous system, where multiple inflammatory cytokines and other active molecules activate different signaling pathways that involve in the development and/or maintenance of pain. P38 mitogen-activated protein kinase (MAPK) is one member of the MAPK family, which is activated in neurons and glia and contributes importantly to inflammatory and neuropathic pain. The aim of this review is to summarize the latest advances made about the implication of p38 MAPK signaling cascade in pain. It can deepen our understanding of the molecular mechanisms of pain and may help to offer new targets for pain treatment.
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Affiliation(s)
- Lijia Mai
- Department of Anesthesiology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
| | - Xiao Zhu
- The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang 524023, China
| | - Fang Huang
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
| | - Hongwen He
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
| | - Wenguo Fan
- Department of Anesthesiology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China.
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11
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Suppression of Superficial Microglial Activation by Spinal Cord Stimulation Attenuates Neuropathic Pain Following Sciatic Nerve Injury in Rats. Int J Mol Sci 2020; 21:ijms21072390. [PMID: 32235682 PMCID: PMC7177766 DOI: 10.3390/ijms21072390] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 03/27/2020] [Accepted: 03/27/2020] [Indexed: 12/29/2022] Open
Abstract
We evaluated the mechanisms underlying the spinal cord stimulation (SCS)-induced analgesic effect on neuropathic pain following spared nerve injury (SNI). On day 3 after SNI, SCS was performed for 6 h by using electrodes paraspinally placed on the L4-S1 spinal cord. The effects of SCS and intraperitoneal minocycline administration on plantar mechanical sensitivity, microglial activation, and neuronal excitability in the L4 dorsal horn were assessed on day 3 after SNI. The somatosensory cortical responses to electrical stimulation of the hind paw on day 3 following SNI were examined by using in vivo optical imaging with a voltage-sensitive dye. On day 3 after SNI, plantar mechanical hypersensitivity and enhanced microglial activation were suppressed by minocycline or SCS, and L4 dorsal horn nociceptive neuronal hyperexcitability was suppressed by SCS. In vivo optical imaging also revealed that electrical stimulation of the hind paw-activated areas in the somatosensory cortex was decreased by SCS. The present findings suggest that SCS could suppress plantar SNI-induced neuropathic pain via inhibition of microglial activation in the L4 dorsal horn, which is involved in spinal neuronal hyperexcitability. SCS is likely to be a potential alternative and complementary medicine therapy to alleviate neuropathic pain following nerve injury.
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12
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Shinoda M, Hayashi Y, Kubo A, Iwata K. Pathophysiological mechanisms of persistent orofacial pain. J Oral Sci 2020; 62:131-135. [PMID: 32132329 DOI: 10.2334/josnusd.19-0373] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Nociceptive stimuli to the orofacial region are typically received by the peripheral terminal of trigeminal ganglion (TG) neurons, and noxious orofacial information is subsequently conveyed to the trigeminal spinal subnucleus caudalis and the upper cervical spinal cord (C1-C2). This information is further transmitted to the cortical somatosensory regions and limbic system via the thalamus, which then leads to the perception of pain. It is a well-established fact that the presence of abnormal pain in the orofacial region is etiologically associated with neuroplastic changes that may occur at any point in the pain transmission pathway from the peripheral to the central nervous system (CNS). Recently, several studies have reported that functional plastic changes in a large number of cells, including TG neurons, glial cells (satellite cells, microglia, and astrocytes), and immune cells (macrophages and neutrophils), contribute to the sensitization and disinhibition of neurons in the peripheral and CNS, which results in orofacial pain hypersensitivity.
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Affiliation(s)
| | | | - Asako Kubo
- Department of Physiology, Nihon University School of Dentistry
| | - Koichi Iwata
- Department of Physiology, Nihon University School of Dentistry
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13
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Wong SSC, Lee UM, Wang XM, Chung SK, Cheung CW. Role of DLC2 and RhoA/ROCK pathway in formalin induced inflammatory pain in mice. Neurosci Lett 2019; 709:134379. [DOI: 10.1016/j.neulet.2019.134379] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 07/01/2019] [Accepted: 07/15/2019] [Indexed: 12/30/2022]
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14
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Zhou KX, He XT, Hu XF, Zhao WJ, Li CX, Zhang C, Zhang T, Gu ZX, Deng JP, Dong YL. XPro1595 ameliorates bone cancer pain in rats via inhibiting p38-mediated glial cell activation and neuroinflammation in the spinal dorsal horn. Brain Res Bull 2019; 149:137-147. [DOI: 10.1016/j.brainresbull.2019.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 03/14/2019] [Accepted: 04/09/2019] [Indexed: 12/11/2022]
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15
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Wang Y, Cao P, Mei L, Yin W, Mao Y, Niu C, Zhang Z, Tao W. Microglia in the Primary Somatosensory Barrel Cortex Mediate Trigeminal Neuropathic Pain. Neuroscience 2019; 414:299-310. [PMID: 31181369 DOI: 10.1016/j.neuroscience.2019.05.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 05/16/2019] [Accepted: 05/17/2019] [Indexed: 02/07/2023]
Abstract
Trigeminal neuropathic pain (TGN) is an attacking, abrupt, electric-shock headache involving abnormal cortical activity. The neural mechanism underlying TGN remains elusive. In this study, we explored the role of microglia in the primary somatosensory barrel cortex (S1BF), which is a critical region for TGN, of a mouse model of TGN that displayed significant pain-related behaviors. Using electrophysiological recordings, we found robust neuronal hyperactivity in glutamatergic neurons of S1BF (GluS1BF). Chemogenetic inhibition of GluS1BF neurons significantly relieved mechanical allodynia in TGN mice. In naïve mice, chemogenetic activation of GluS1BF neurons induced pain sensitization. In addition, we found that microglia in the S1BF (microgliaS1BF) were significantly activated, with density and morphology changes. Intraperitoneal administration of minocycline, a microglia inhibitor, attenuated pain sensitization, and decreased GluS1BF neuronal activity. Together, these findings demonstrate the putative importance of microglia as a key regulator in TGN through actions on GluS1BF neuronal adaptation.
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Affiliation(s)
- Yuping Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China
| | - Peng Cao
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China
| | - Lisheng Mei
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China
| | - Weiwei Yin
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China
| | - Yu Mao
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China; Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230022, PR China
| | - Chaoshi Niu
- Department of Neurosurgery, The First Affiliated Hospital of University of Science and Technology of China, Hefei 230001, PR China
| | - Zhi Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China.
| | - Wenjuan Tao
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Brain Function and Disease, Department of Biophysics and Neurobiology, University of Science and Technology of China, Hefei 230027, PR China; Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230022, PR China.
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16
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Turcato F, Almeida C, Mota C, Kusuda R, Carvalho A, Nascimento GC, Zanon S, Leite-Panissi CR, Lucas G. Dynamic expression of glial fibrillary acidic protein and ionized calcium binding adaptor molecule 1 in the mouse spinal cord dorsal horn under pathological pain states. Neurol Res 2019; 41:633-643. [DOI: 10.1080/01616412.2019.1603804] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Flavia Turcato
- Department of Physiology, Laboratory of Pain Neurobiology, Ribeirão Preto School of Medicine, University of São Paulo, Ribeirão Preto, Brazil
| | - Cayo Almeida
- Federal University of ABC, São Bernardo do Campo, Brazil
| | - Clarissa Mota
- Department of Physiology, Laboratory of Pain Neurobiology, Ribeirão Preto School of Medicine, University of São Paulo, Ribeirão Preto, Brazil
| | - Ricardo Kusuda
- Department of Physiology, Laboratory of Pain Neurobiology, Ribeirão Preto School of Medicine, University of São Paulo, Ribeirão Preto, Brazil
| | - Andrea Carvalho
- Department of Experimental Psychology, Neuroscience and Behavior Training Program, Institute of Psychology, University of São Paulo, São Paulo, Brazil
| | - Glauce C Nascimento
- Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dentistry School, University of São Paulo, Ribeirão Preto, Brazil
| | - Sonia Zanon
- Department of Physiology, Laboratory of Pain Neurobiology, Ribeirão Preto School of Medicine, University of São Paulo, Ribeirão Preto, Brazil
| | - Christie R Leite-Panissi
- Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dentistry School, University of São Paulo, Ribeirão Preto, Brazil
| | - Guilherme Lucas
- Department of Physiology, Laboratory of Pain Neurobiology, Ribeirão Preto School of Medicine, University of São Paulo, Ribeirão Preto, Brazil
- Department of Experimental Psychology, Neuroscience and Behavior Training Program, Institute of Psychology, University of São Paulo, São Paulo, Brazil
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17
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Photobiomodulation-induced analgesia in experimental temporomandibular disorder involves central inhibition of fractalkine. Lasers Med Sci 2019; 34:1841-1847. [DOI: 10.1007/s10103-019-02785-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 04/03/2019] [Indexed: 12/19/2022]
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18
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Iwata K, Katagiri A, Shinoda M. Neuron-glia interaction is a key mechanism underlying persistent orofacial pain. J Oral Sci 2018. [PMID: 28637974 DOI: 10.2334/josnusd.16-0858] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Excitability of neurons in the trigeminal ganglion (TG), trigeminal spinal subnucleus caudalis (Vc), and upper cervical spinal cord (C1-C2) is greatly enhanced after orofacial inflammation and trigeminal nerve injury, and TG, Vc, and C1-C2 neurons remain sensitized long after such episodes. Sensitized neurons generate various molecules, which are released from nociceptive neurons in these areas and are involved in modulating the excitability of TG, Vc, and C1-C2 nociceptive neurons. Hyperexcitable nociceptive neurons also activate satellite glial cells in the TG and microglial cells and astrocytes in the Vc and C1-C2. Glial cell activation spreads throughout the TG, Vc, and C1-C2 and triggers the release of various molecules involved in modulating nociceptive neurons in TG, Vc, and C1-C2 neurons. These findings suggest that functional interaction between neurons and glial cells is critical in persistent orofacial pain associated with orofacial inflammation and trigeminal nerve injury.
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Affiliation(s)
- Koichi Iwata
- Department of Physiology, Nihon University School of Dentistry
| | - Ayano Katagiri
- Department of Physiology, Nihon University School of Dentistry
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19
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Chi B, Wang S, Bi S, Qin W, Wu D, Luo Z, Gui S, Wang D, Yin X, Wang F. Effects of ganoderic acid A on lipopolysaccharide-induced proinflammatory cytokine release from primary mouse microglia cultures. Exp Ther Med 2017; 15:847-853. [PMID: 29399089 PMCID: PMC5772755 DOI: 10.3892/etm.2017.5472] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 08/24/2017] [Indexed: 01/13/2023] Open
Abstract
For several thousand years, Ganoderma lucidum (Ling-Zhi in Chinese and Reishi in Japanese) has been widely used as a traditional medication for the prevention and treatment of various diseases in Asia. Its major biologically active components, ganoderic acids (GAs), exhibit significant medicinal value due to their anti-inflammatory effects. Dysregulation of microglial function may cause seizures or promote epileptogenesis through release of proinflammatory cytokines, including interleukin (IL)-1β, IL-6 and tumor necrosis factor (TNF)-α. At present, only little information is available on the effects of GAs on microglia-mediated inflammation in vitro and/or in vivo. The present study aimed to investigate the role of GA-A on microglia-mediated inflammation in vitro. In addition, the effect of GA-A on lipopolysaccharide (LPS)-evoked alterations in mitochondrial metabolic activity of microglia was evaluated. The results of the present study demonstrated that GA-A significantly decreased LPS-induced IL-1β, IL-6 and TNF-α release from mouse-derived primary cortical microglial cells in a concentration-dependent manner. GA-A treatment reduced LPS-induced expression of nuclear factor (NF)-κB (p65) and its inhibitor, demonstrating that non-toxic suppression of IL-1β, IL-6 and TNF-α production by GA-A is, at least in part, due to suppression of the NF-κB signaling pathway. In addition, the LPS-induced stimulation of mitochondrial activity of microglial cells was abolished by co-treatment with GA-A. Thus, GA-A treatment may be a potential therapeutic strategy for epilepsy prevention by suppressing microglia-derived proinflammatory mediators.
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Affiliation(s)
- Baojin Chi
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China.,Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Shuqiu Wang
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| | - Sheng Bi
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Wenbo Qin
- Department of Urology, The Second Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
| | - Dongmei Wu
- Material College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| | - Zhenguo Luo
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Shiliang Gui
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Dongwei Wang
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Xingzhong Yin
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| | - Fangfang Wang
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
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20
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Nijs J, Loggia ML, Polli A, Moens M, Huysmans E, Goudman L, Meeus M, Vanderweeën L, Ickmans K, Clauw D. Sleep disturbances and severe stress as glial activators: key targets for treating central sensitization in chronic pain patients? Expert Opin Ther Targets 2017; 21:817-826. [DOI: 10.1080/14728222.2017.1353603] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jo Nijs
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physical Medicine and Physiotherapy, University Hospital Brussels, Brussels, Belgium
| | - Marco L. Loggia
- MGH/HST A. A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA
| | - Andrea Polli
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
| | - Maarten Moens
- Department of Neurosurgery and Radiology, University Hospital Brussels, Brussels, Belgium
- Department of Manual Therapy, Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium
| | - Eva Huysmans
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
| | - Lisa Goudman
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Neurosurgery and Radiology, University Hospital Brussels, Brussels, Belgium
| | - Mira Meeus
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Rehabilitation Sciences and Physiotherapy, Ghent University, Ghent, Belgium
- Department of Rehabilitation Sciences and Physiotherapy, University of Antwerp, Antwerp, Belgium
| | - Luc Vanderweeën
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
- Private Practice for Spinal Manual Therapy, Schepdaal-Dilbeek, Belgium
| | - Kelly Ickmans
- Department of physiotherapy, human physiology and anatomy, Pain in Motion International Research Group, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Physical Medicine and Physiotherapy, University Hospital Brussels, Brussels, Belgium
| | - Daniel Clauw
- Chronic Pain and Fatigue Research Center, University of Michigan, Ann Arbor, USA
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21
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Zhang Q, Zhu MD, Cao DL, Bai XQ, Gao YJ, Wu XB. Chemokine CXCL13 activates p38 MAPK in the trigeminal ganglion after infraorbital nerve injury. Inflammation 2017; 40:762-769. [DOI: 10.1007/s10753-017-0520-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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22
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Jing L, Liu XD, Yang HX, Zhang M, Wang Y, Duan L, Zhang J, Lu L, Yang T, Wang DM, Chen LW, Wang MQ. ERK potentiates p38 in central sensitization induced by traumatic occlusion. Neuroscience 2016; 340:445-454. [PMID: 27865869 DOI: 10.1016/j.neuroscience.2016.11.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 10/22/2016] [Accepted: 11/08/2016] [Indexed: 12/28/2022]
Abstract
This study was to investigate the role of p38 activation via ERK1/2 phosphorylation in neurons and microglia of the spinal trigeminal subnucleus caudalis (Vc) in the promotion of orofacial hyperalgesia induced by unilateral anterior crossbite (UAC) traumatic occlusion in adult rats. U0126, a p-ERK1/2 inhibitor, was injected intracisternally before UAC implant. The effects of the U0126 injection were compared to those following the injection of SB203580, a p-p38 inhibitor. Mechanical hyperalgesia was evaluated via pressure pain threshold measurements. Brain stem tissues were processed for a Western blot analysis to evaluate the activation of ERK1/2 and p38. Double immunofluorescence was also performed to observe the expression of p-ERK1/2 and p-p38 in neurons (labeled by NeuN) and microglia (labeled by OX42). The data showed that UAC caused orofacial hyperalgia ipsilaterally on d1 to d7, peaking on d3 (P<0.05). An upregulation of p-ERK1/2 was observed in the ipsilateral Vc on d1 to d3, peaking on d1. An upregulation of p-p38 was also observed on d1 to d7, peaking on d3 (P<0.05). p-ERK1/2 primarily co-localized with NeuN and, to a lesser extent, with OX42, while p-p38 co-localized with both NeuN and OX42. Pretreatment with U0126 prevented the upregulation of both p-ERK1/2 and p-p38. Similarly to an intracisternal injection of SB203580, U0126 pretreatment attenuated the UAC-induced orofacial hyperalgesia. These data indicate that UAC caused orofacial hyperalgesia by inducing central sensitization via the activation of ERK1/2 and p38 in both neurons and microglia in the Vc, potentially impacting the effects of p-ERK1/2 during p38 activation.
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Affiliation(s)
- Lei Jing
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Xiao-Dong Liu
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Hong-Xu Yang
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Mian Zhang
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Ying Wang
- State Key Laboratory of Military Stomatology, Shaanxi Engineering Research Center for Dental Materials and Advanced Manufacture, Department of Periodontal Disease, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Li Duan
- Institute of Neurosciences, Fourth Military Medical University, 169 Changlexi Road, Xi'an 710032, China
| | - Jing Zhang
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Lei Lu
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Ting Yang
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Dong-Mei Wang
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China
| | - Liang-Wei Chen
- Institute of Neurosciences, Fourth Military Medical University, 169 Changlexi Road, Xi'an 710032, China.
| | - Mei-Qing Wang
- State Key Laboratory of Military Stomatology, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, 145 Changlexi Road, Xi'an 710032, China.
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