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Ciapała K, Mika J. Advances in Neuropathic Pain Research: Selected Intracellular Factors as Potential Targets for Multidirectional Analgesics. Pharmaceuticals (Basel) 2023; 16:1624. [PMID: 38004489 PMCID: PMC10675751 DOI: 10.3390/ph16111624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 11/13/2023] [Accepted: 11/15/2023] [Indexed: 11/26/2023] Open
Abstract
Neuropathic pain is a complex and debilitating condition that affects millions of people worldwide. Unlike acute pain, which is short-term and starts suddenly in response to an injury, neuropathic pain arises from somatosensory nervous system damage or disease, is usually chronic, and makes every day functioning difficult, substantially reducing quality of life. The main reason for the lack of effective pharmacotherapies for neuropathic pain is its diverse etiology and the complex, still poorly understood, pathophysiological mechanism of its progression. Numerous experimental studies, including ours, conducted over the last several decades have shown that the development of neuropathic pain is based on disturbances in cell activity, imbalances in the production of pronociceptive factors, and changes in signaling pathways such as p38MAPK, ERK, JNK, NF-κB, PI3K, and NRF2, which could become important targets for pharmacotherapy in the future. Despite the availability of many different analgesics, relieving neuropathic pain is still extremely difficult and requires a multidirectional, individual approach. We would like to point out that an increasing amount of data indicates that nonselective compounds directed at more than one molecular target exert promising analgesic effects. In our review, we characterize four substances (minocycline, astaxanthin, fisetin, and peimine) with analgesic properties that result from a wide spectrum of actions, including the modulation of MAPKs and other factors. We would like to draw attention to these selected substances since, in preclinical studies, they show suitable analgesic properties in models of neuropathy of various etiologies, and, importantly, some are already used as dietary supplements; for example, astaxanthin and fisetin protect against oxidative stress and have anti-inflammatory properties. It is worth emphasizing that the results of behavioral tests also indicate their usefulness when combined with opioids, the effectiveness of which decreases when neuropathy develops. Moreover, these substances appear to have additional, beneficial properties for the treatment of diseases that frequently co-occur with neuropathic pain. Therefore, these substances provide hope for the development of modern pharmacological tools to not only treat symptoms but also restore the proper functioning of the human body.
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Affiliation(s)
| | - Joanna Mika
- Department of Pain Pharmacology, Maj Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Str., 31-343 Kraków, Poland;
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2
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Atmani K, Wuestenberghs F, Baron M, Bouleté I, Guérin C, Bahlouli W, Vaudry D, do Rego JC, Cornu JN, Leroi AM, Coëffier M, Meleine M, Gourcerol G. Bladder-colon chronic cross-sensitization involves neuro-glial pathways in male mice. World J Gastroenterol 2022; 28:6935-6949. [PMID: 36632316 PMCID: PMC9827584 DOI: 10.3748/wjg.v28.i48.6935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 10/02/2022] [Accepted: 10/26/2022] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Irritable bowel syndrome and bladder pain syndrome often overlap and are both characterized by visceral hypersensitivity. Since pelvic organs share common sensory pathways, it is likely that those syndromes involve a cross-sensitization of the bladder and the colon. The precise pathophysiology remains poorly understood.
AIM To develop a model of chronic bladder-colon cross-sensitization and to investigate the mech-anisms involved.
METHODS Chronic cross-organ visceral sensitization was obtained in C57BL/6 mice using ultrasound-guided intravesical injections of acetic acid under brief isoflurane anesthesia. Colorectal sensitivity was assessed in conscious mice by measuring intracolonic pressure during isobaric colorectal distensions. Myeloperoxidase, used as a marker of colorectal inflammation, was measured in the colon, and colorectal permeability was measured using chambers. c-Fos protein expression, used as a marker of neuronal activation, was assessed in the spinal cord (L6-S1 level) using immunohistochemistry. Green fluorescent protein on the fractalkine receptor-positive mice were used to identify and count microglia cells in the L6-S1 dorsal horn of the spinal cord. The expression of NK1 receptors and MAPK-p38 were quantified in the spinal cord using western blot.
RESULTS Visceral hypersensitivity to colorectal distension was observed after the intravesical injection of acetic acid vs saline (P < 0.0001). This effect started 1 h post-injection and lasted up to 7 d post-injection. No increased permeability or inflammation was shown in the bladder or colon 7 d post-injection. Visceral hypersensitivity was associated with the increased expression of c-Fos protein in the spinal cord (P < 0.0001). In green fluorescent protein on the fractalkine receptor-positive mice, intravesical acetic acid injection resulted in an increased number of microglia cells in the L6-S1 dorsal horn of the spinal cord (P < 0.0001). NK1 receptor and MAPK-p38 levels were increased in the spinal cord up to 7 d after injection (P = 0.007 and 0.023 respectively). Colorectal sensitization was prevented by intrathecal or intracerebroventricular injections of minocycline, a microglia inhibitor, by intracerebroventricular injection of CP-99994 dihydrochloride, a NK1 antagonist, and by intracerebroventricular injection of SB203580, a MAPK-p38 inhibitor.
CONCLUSION We describe a new model of cross-organ visceral sensitization between the bladder and the colon in mice. Intravesical injections of acetic acid induced a long-lasting colorectal hypersensitivity to distension, mediated by neuroglial interactions, MAPK-p38 phosphorylation and the NK1 receptor.
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Affiliation(s)
- Karim Atmani
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
| | - Fabien Wuestenberghs
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Department of Gastroenterology and Hepatology, Université Catholique de Louvain, CHU UCL Namur, Yvoir 5530, Belgium
- Department of Physiology, CHU Rouen, Université de Rouen Normandie, Rouen 76031, France
| | - Maximilien Baron
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Department of Urology, CHU Rouen, Université de Rouen Normandie, Rouen 76000, France
| | - Illona Bouleté
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
| | - Charlène Guérin
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
| | - Wafa Bahlouli
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
| | - David Vaudry
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Inserm, UMR 1245, Team Epigenetics and Pathophysiology of Neuro-developmental Disorders, Université de Rouen Normandie, Rouen 76000, France
| | - Jean Claude do Rego
- Behavioural Analysis Platform (SCAC), HeRacLeS Inserm US51-CNRS UAR2026, Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
| | - Jean-Nicolas Cornu
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Department of Urology, CHU Rouen, Université de Rouen Normandie, Rouen 76000, France
| | - Anne-Marie Leroi
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Department of Physiology, CHU Rouen, Université de Rouen Normandie, Rouen 76031, France
| | - Moïse Coëffier
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Department of Nutrition, CHU Rouen, Université de Rouen Normandie, Rouen 76000, France
| | - Mathieu Meleine
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Inserm U1107, NeuroDol, Clermont Auvergne University, Clermont-Ferrand 63000, France
| | - Guillaume Gourcerol
- Nutrition, Gut and Brain Unit (Inserm U1073), Institute for Research and Innovation in Biomedicine, Université de Rouen Normandie, Rouen 76000, France
- Department of Physiology, CHU Rouen, Université de Rouen Normandie, Rouen 76031, France
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3
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Huang ST, Chen BB, Song ZJ, Tang HL, Hua R, Zhang YM. Unraveling the role of Epac1-SOCS3 signaling in the development of neonatal-CRD-induced visceral hypersensitivity in rats. CNS Neurosci Ther 2022; 28:1393-1408. [PMID: 35702948 PMCID: PMC9344090 DOI: 10.1111/cns.13880] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 05/18/2022] [Accepted: 05/20/2022] [Indexed: 11/28/2022] Open
Abstract
Aims Visceral hypersensitivity in irritable bowel syndrome (IBS) is widespread, but effective therapies for it remain elusive. As a canonical anti‐inflammatory protein, suppressor of cytokine signaling 3 (SOCS3) reportedly relays exchange protein 1 directly activated by cAMP (Epac1) signaling and inhibits the intracellular response to inflammatory cytokines. Despite the inhibitory effect of SOCS3 on the pro‐inflammatory response and neuroinflammation in PVN, the systematic investigation of Epac1‐SOCS3 signaling involved in visceral hypersensitivity remains unknown. This study aimed to explore Epac1‐SOCS3 signaling in the activity of hypothalamic paraventricular nucleus (PVN) corticotropin‐releasing factor (CRF) neurons and visceral hypersensitivity in adult rats experiencing neonatal colorectal distension (CRD). Methods Rats were subjected to neonatal CRD to simulate visceral hypersensitivity to investigate the effect of Epac1‐SOCS3 signaling on PVN CRF neurons. The expression and activity of Epac1 and SOCS3 in nociceptive hypersensitivity were determined by western blot, RT‐PCR, immunofluorescence, radioimmunoassay, electrophysiology, and pharmacology. Results In neonatal‐CRD‐induced visceral hypersensitivity model, Epac1 and SOCS3 expressions were downregulated and IL‐6 levels elevated in PVN. However, infusion of Epac agonist 8‐pCPT in PVN reduced CRF neuronal firing rates, and overexpression of SOCS3 in PVN by AAV‐SOCS3 inhibited the activation of PVN neurons, reduced visceral hypersensitivity, and precluded pain precipitation. Intervention with IL‐6 neutralizing antibody also alleviated the visceral hypersensitivity. In naïve rats, Epac antagonist ESI‐09 in PVN increased CRF neuronal firing. Consistently, genetic knockdown of Epac1 or SOCS3 in PVN potentiated the firing rate of CRF neurons, functionality of HPA axis, and sensitivity of visceral nociception. Moreover, pharmacological intervention with exogenous IL‐6 into PVN simulated the visceral hypersensitivity. Conclusions Inactivation of Epac1‐SOCS3 pathway contributed to the neuroinflammation accompanied by the sensitization of CRF neurons in PVN, precipitating visceral hypersensitivity and pain in rats experiencing neonatal CRD.
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Affiliation(s)
- Si-Ting Huang
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University, Xuzhou, China.,Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou Medical University, Xuzhou, China.,NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou, China
| | - Bin-Bin Chen
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University, Xuzhou, China.,Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou Medical University, Xuzhou, China.,NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou, China
| | - Zhi-Jing Song
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University, Xuzhou, China.,Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou Medical University, Xuzhou, China.,NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou, China
| | - Hui-Li Tang
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University, Xuzhou, China.,Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou Medical University, Xuzhou, China.,NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou, China
| | - Rong Hua
- Department of Emergency, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
| | - Yong-Mei Zhang
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University, Xuzhou, China.,Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou Medical University, Xuzhou, China.,NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou, China
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Zhan MX, Tang L, Lu YF, Wu HH, Guo ZB, Shi ZM, Yang CL, Zou YQ, Yang F, Chen GZ. Ulinastatin Exhibits Antinociception in Rat Models of Acute Somatic and Visceral Pain Through Inhibiting the Local and Central Inflammation. J Pain Res 2021; 14:1201-1214. [PMID: 33976570 PMCID: PMC8106509 DOI: 10.2147/jpr.s303595] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 03/31/2021] [Indexed: 12/28/2022] Open
Abstract
Introduction Ulinastatin, a broad-spectrum serine protease inhibitor, has been widely used to treat various diseases clinically. However, so far, the antinociceptive effect of ulinastatin remains less studied experimentally and the underlying mechanisms of ulinastatin for pain relief remain unclear. This study aimed to find evidence of the analgesic effect of ulinastatin on acute somatic and visceral pain. Methods The analgesic effect of ulinastatin on acute somatic and visceral pain was evaluated by using formalin and acetic acid-induced writhing test. The analgesic mechanism of ulinastatin was verified by detecting the peripheral inflammatory cell infiltration and spinal glial activation with hematoxylin-eosin (H&E) and immunohistochemistry staining. Results We found that both of intraperitoneal (i.p.) pre-administration and post-administration of ulinastatin could reduce the total number of flinching and the licking duration following intraplantar formalin injection in a dose-related manner. However, the inhibitory effect of ulinastatin existed only in the second phase (Phase 2) of formalin-induced spontaneous pain response, with no effect in the first phase (Phase 1). The formalin-induced edema and ulcer were also improved by i.p. administration of ulinastatin. Moreover, i.p. administration of ulinastatin was also able to delay the occurrence of acetic acid-induced writhing and reduced the total number of writhes dose-dependently. We further demonstrated that ulinastatin significantly decreased the local inflammatory cell infiltration in injured paw and peritoneum tissue under formalin and acetic acid test separately. The microglial and astrocytic activation in the spinal dorsal horn induced by intraplantar formalin and i.p. acetic acid injection were also dramatically inhibited by i.p. administration of ulinastatin. Conclusion Our results for the first time provided a new line of evidence showing that ulinastatin could attenuate acute somatic and visceral pain by inhibiting the peripheral and spinal inflammatory reaction.
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Affiliation(s)
- Mei-Xiang Zhan
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China.,Department of Anesthesiology and Perioperative Medicine, Dongfang Hospital, Xiamen University, Fuzhou, Fujian, 350025, People's Republic of China
| | - Li Tang
- Department of Stomatology, Beijing Friendship Hospital, Capital Medical University, Beijing, 100050, People's Republic of China
| | - Yun-Fei Lu
- Department of Anesthesiology, Fifth Medical Center of Chinese PLA General Hospital, Beijing, 100039, People's Republic of China
| | - Huang-Hui Wu
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China
| | - Zhi-Bin Guo
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China
| | - Zhong-Mou Shi
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China
| | - Chen-Long Yang
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China
| | - Yi-Qing Zou
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China.,Department of Anesthesiology and Perioperative Medicine, Dongfang Hospital, Xiamen University, Fuzhou, Fujian, 350025, People's Republic of China
| | - Fei Yang
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China.,Department of Anesthesiology and Perioperative Medicine, Dongfang Hospital, Xiamen University, Fuzhou, Fujian, 350025, People's Republic of China.,Laboratory of Pain Research, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian, 350122, People's Republic of China
| | - Guo-Zhong Chen
- Department of Anesthesiology and Perioperative Medicine, Clinical Medical College, (900 Hospital of the Joint Logistic Support Force), Fujian Medical University, Fuzhou, Fujian, 350025, People's Republic of China.,Department of Anesthesiology and Perioperative Medicine, Dongfang Hospital, Xiamen University, Fuzhou, Fujian, 350025, People's Republic of China
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Liu Q, Min T, Dong J, Wang X. Minocycline alleviates the symptoms of morphine withdrawal via the CaMKII-Ras-ERK signaling pathway. Neurosci Lett 2021; 752:135825. [PMID: 33727130 DOI: 10.1016/j.neulet.2021.135825] [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: 11/11/2020] [Revised: 02/18/2021] [Accepted: 03/08/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To investigate the effect of minocycline on morphine withdrawal symptoms. METHODS We established a rat model of morphine dependence, then injected the animals with naloxone to induce withdrawal symptoms. Minocycline was injected into the midbrain periaqueductal gray and its effect on withdrawal symptoms and Ca2+-dependent protein kinase (CaMKII), Ras, and phospho-extracellular signal-regulated kinase (p-ERK) expression was observed. RESULTS Minocycline inhibited withdrawal symptoms such as "wet dog" shakes, teeth chatter, and ptosis, perhaps by inhibiting the activation of microglia and the expression of CaMKII, Ras, and p-ERK. Minocycline had no effect on the behavior of control rats or on CaMKII, Ras, or p-ERK expression. CONCLUSION Minocycline alleviates morphine withdrawal symptoms by inhibiting the activation of microglia and downregulating the expression of CaMKII, Ras, and p-ERK.
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Affiliation(s)
- Qiaofeng Liu
- Department of Pathology and Pathophysiology, Chengdu Medical College, Chengdu, China; Department of Pathogenic Biology, Chengdu Medical College, Chengdu, China
| | - Ting Min
- Department of Pathology and Pathophysiology, Chengdu Medical College, Chengdu, China; Department of Pathogenic Biology, Chengdu Medical College, Chengdu, China
| | - Jun Dong
- Department of Pathology and Pathophysiology, Chengdu Medical College, Chengdu, China; Department of Pathogenic Biology, Chengdu Medical College, Chengdu, China
| | - Xin Wang
- Department of Pathology and Pathophysiology, Chengdu Medical College, Chengdu, China; Department of Pathogenic Biology, Chengdu Medical College, Chengdu, China.
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Sensory neuron-associated macrophages as novel modulators of neuropathic pain. Pain Rep 2021; 6:e873. [PMID: 33981924 PMCID: PMC8108583 DOI: 10.1097/pr9.0000000000000873] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/13/2020] [Accepted: 10/19/2020] [Indexed: 12/28/2022] Open
Abstract
The peripheral nervous system comprises an infinity of neural networks that act in the communication between the central nervous system and the most diverse tissues of the body. Along with the extension of the primary sensory neurons (axons and cell bodies), a population of resident macrophages has been described. These newly called sensory neuron-associated macrophages (sNAMs) seem to play an essential role in physiological and pathophysiological processes, including infection, autoimmunity, nerve degeneration/regeneration, and chronic neuropathic pain. After different types of peripheral nerve injury, there is an increase in the number and activation of sNAMs in the sciatic nerve and sensory ganglia. The activation of sNAMs and their participation in neuropathic pain development depends on the stimulation of pattern recognition receptors such as Toll-like receptors and Nod-like receptors, chemokines/cytokines, and microRNAs. On activation, sNAMs trigger the production of critical inflammatory mediators such as proinflammatory cytokines (eg, TNF and IL-1β) and reactive oxygen species that can act in the amplification of primary sensory neurons sensitization. On the other hand, there is evidence that sNAMs can produce antinociceptive mediators (eg, IL-10) that counteract neuropathic pain development. This review will present the cellular and molecular mechanisms behind the participation of sNAMs in peripheral nerve injury-induced neuropathic pain development. Understanding how sNAMs are activated and responding to nerve injury can help set novel targets for the control of neuropathic pain.
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7
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Shu B, He SQ, Guan Y. Spinal Cord Stimulation Enhances Microglial Activation in the Spinal Cord of Nerve-Injured Rats. Neurosci Bull 2020; 36:1441-1453. [PMID: 32889636 DOI: 10.1007/s12264-020-00568-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 07/23/2020] [Indexed: 12/14/2022] Open
Abstract
Microglia can modulate spinal nociceptive transmission. Yet, their role in spinal cord stimulation (SCS)-induced pain inhibition is unclear. Here, we examined how SCS affects microglial activation in the lumbar cord of rats with chronic constriction injury (CCI) of the sciatic nerve. Male rats received conventional SCS (50 Hz, 80% motor threshold, 180 min, 2 sessions/day) or sham stimulation on days 18-20 post-CCI. SCS transiently attenuated the mechanical hypersensitivity in the ipsilateral hind paw and increased OX-42 immunoreactivity in the bilateral dorsal horns. SCS also upregulated the mRNAs of M1-like markers, but not M2-like markers. Inducible NOS protein expression was increased, but brain-derived neurotrophic factor was decreased after SCS. Intrathecal minocycline (1 μg-100 μg), which inhibits microglial activation, dose-dependently attenuated the mechanical hypersensitivity. Pretreatment with low-dose minocycline (1 μg, 30 min) prolonged the SCS-induced pain inhibition. These findings suggest that conventional SCS may paradoxically increase spinal M1-like microglial activity and thereby compromise its own ability to inhibit pain.
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Affiliation(s)
- Bin Shu
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA.,Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Shao-Qiu He
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Yun Guan
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA. .,Department of Neurological Surgery, School of Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA.
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Inhibiting the LPS-induced enhancement of mEPSC frequency in superficial dorsal horn neurons may serve as an electrophysiological model for alleviating pain. Sci Rep 2019; 9:16032. [PMID: 31690742 PMCID: PMC6831605 DOI: 10.1038/s41598-019-52405-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 10/10/2019] [Indexed: 12/30/2022] Open
Abstract
Pain is a major primary health care problem. Emerging studies show that inhibition of spinal microglial activation reduces pain. However, the precise mechanisms by which microglial activation contributes to nociceptive synaptic transmission remain unclear. In this study, we measured spontaneous synaptic activity of miniature excitatory postsynaptic currents (mEPSCs) in rat spinal cord superficial dorsal horn (SDH, laminae I and II) neurons. Lipopolysaccharide (LPS) and adenosine triphosphate (ATP) increased the frequency, but not amplitude, of mEPSCs in SDH neurons. Microglial inhibitors minocycline and paeonol, as well as an astrocyte inhibitor, a P2Y1 receptor (P2Y1R) antagonist, and a metabotropic glutamate receptor 5 (mGluR5) antagonist, all prevented LPS-induced enhancement of mEPSC frequency. In mouse behavioral testing, minocycline and paeonol effectively reduced acetic acid-induced writhing and LPS-induced hyperalgesia. These results indicate that LPS-activated microglia release ATP, which stimulates astrocyte P2Y1Rs to release glutamate, triggering presynaptic mGluR5 receptors and increasing presynaptic glutamate release, leading to an increase in mEPSC frequency and enhancement of nociceptive transmission in SDH neurons. We propose that these effects can serve as a new electrophysiological model for evaluating pain. Moreover, we predict that pharmacologic agents capable of inhibiting the LPS-induced enhancement of mEPSC frequency in SDH neurons will have analgesic effects.
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9
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Yang H, Gao XJ, Li YJ, Su JB, E TZ, Zhang X, Ni W, Gu YX. Minocycline reduces intracerebral hemorrhage-induced white matter injury in piglets. CNS Neurosci Ther 2019; 25:1195-1206. [PMID: 31556245 PMCID: PMC6776747 DOI: 10.1111/cns.13220] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 08/11/2019] [Accepted: 08/28/2019] [Indexed: 12/21/2022] Open
Abstract
Aims White matter (WM) injury after intracerebral hemorrhage (ICH) results in poor or even fatal outcomes. As an anti‐inflammatory drug, minocycline has been considered a promising choice to treat brain injury after ICH. However, whether minocycline can reduce WM injury after ICH is still controversial. In the present study, we investigate the effect and underlying mechanism of minocycline on WM injury after ICH. Methods An ICH model was induced by an injection of autologous blood into the right frontal lobe of piglets. First, transcriptional analysis was performed at day 1 or 3 to investigate the dynamic changes in neuroinflammatory gene expression in WM after ICH. Second, ICH piglets were treated either with minocycline or with vehicle alone. All piglets then underwent magnetic resonance imaging to measure brain swelling. Brain tissue was used for real‐time polymerase chain reaction (RT‐PCR), immunohistochemistry, Western blot, and electron microscopy. Results Transcriptional analysis demonstrated that transforming growth factor‐β (TGF‐β)/mitogen‐activated protein kinase (MAPK) signaling is associated with microglia/macrophage‐mediated inflammation activation after ICH and is then involved in WM injury after ICH in piglets. Minocycline treatment results in less ICH‐induced brain swelling, fewer neurological deficits, and less WM injury in comparison with the vehicle alone. In addition, minocycline reduces microglial activation and alleviates demyelination in white matter after ICH. Finally, we found that minocycline attenuates WM injury by increasing the expression of TGF‐β and suppressing MAPK activation after ICH. Conclusion These results indicate that TGF‐β–mediated MAPK signaling contributes to WM injury after ICH, which can be altered by minocycline treatment.
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Affiliation(s)
- Heng Yang
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Xin-Jie Gao
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Yan-Jiang Li
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Jia-Bin Su
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Tong-Zhou E
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Xin Zhang
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Wei Ni
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Yu-Xiang Gu
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
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Liu HY, Yue J, Hu LN, Cheng LF, Wang XS, Wang XJ, Feng B. Chronic minocycline treatment reduces the anxiety-like behaviors induced by repeated restraint stress through modulating neuroinflammation. Brain Res Bull 2018; 143:19-26. [DOI: 10.1016/j.brainresbull.2018.08.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/08/2018] [Accepted: 08/22/2018] [Indexed: 12/20/2022]
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11
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Litvin DG, Dick TE, Smith CB, Jacono FJ. Lung-injury depresses glutamatergic synaptic transmission in the nucleus tractus solitarii via discrete age-dependent mechanisms in neonatal rats. Brain Behav Immun 2018; 70:398-422. [PMID: 29601943 PMCID: PMC6075724 DOI: 10.1016/j.bbi.2018.03.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 03/20/2018] [Accepted: 03/26/2018] [Indexed: 12/26/2022] Open
Abstract
Transition periods (TPs) are brief stages in CNS development where neural circuits can exhibit heightened vulnerability to pathologic conditions such as injury or infection. This susceptibility is due in part to specialized mechanisms of synaptic plasticity, which may become activated by inflammatory mediators released under pathologic conditions. Thus, we hypothesized that the immune response to lung injury (LI) mediated synaptic changes through plasticity-like mechanisms that depended on whether LI occurred just before or after a TP. We studied the impact of LI on brainstem 2nd-order viscerosensory neurons located in the nucleus tractus solitarii (nTS) during a TP for respiratory control spanning (postnatal day (P) 11-15). We injured the lungs of Sprague-Dawley rats by intratracheal instillation of Bleomycin (or saline) just before (P9-11) or after (P17-19) the TP. A week later, we prepared horizontal slices of the medulla and recorded spontaneous and evoked excitatory postsynaptic currents (sEPSCs/eEPSCs) in vitro from neurons in the nTS that received monosynaptic glutamatergic input from the tractus solitarii (TS). In rats injured before the TP (pre-TP), neurons exhibited blunted sEPSCs and TS-eEPSCs compared to controls. The decreased TS-eEPSCs were mediated by differences in postsynaptic α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic-acid receptors (AMPAR). Specifically, compared to controls, LI rats had more Ca2+-impermeable AMPARs (CI-AMPARs) as indicated by: 1) the absence of current-rectification, 2) decreased sensitivity to polyamine, 1-Naphthyl-acetyl-spermine-trihydrochloride (NASPM) and 3) augmented immunoreactive staining for the CI-AMPAR GluA2. Thus, pre-TP-LI acts postsynaptically to blunt glutamatergic transmission. The neuroimmune response to pre-TP-LI included microglia hyper-ramification throughout the nTS. Daily intraperitoneal administration of minocycline, an inhibitor of microglial/macrophage function prevented hyper-ramification and abolished the pre-TP-LI evoked synaptic changes. In contrast, rat-pups injured after the TP (post-TP) exhibited microglia hypo-ramification in the nTS and had increased sEPSC amplitudes/frequencies, and decreased TS-eEPSC amplitudes compared to controls. These synaptic changes were not associated with changes in CI-AMPARs, and instead involved greater TS-evoked use-dependent depression (reduced paired pulse ratio), which is a hallmark of presynaptic plasticity. Thus we conclude that LI regulates the efficacy of TS → nTS synapses through discrete plasticity-like mechanisms that are immune-mediated and depend on whether the injury occurs before or after the TP for respiratory control.
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Affiliation(s)
- David G Litvin
- Department of Physiology & Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States; Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States; Division of Pulmonary, Critical Care and Sleep Medicine, Louis Stokes VA Medical Center, Cleveland, OH 44106, United States
| | - Thomas E Dick
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States; Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States
| | - Corey B Smith
- Department of Physiology & Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States
| | - Frank J Jacono
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States; Division of Pulmonary, Critical Care and Sleep Medicine, Louis Stokes VA Medical Center, Cleveland, OH 44106, United States.
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12
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Upregulation of BDNF and Interleukin-1ß in rat spinal cord following noxious hind paw stimulation. Neurosci Lett 2018; 665:152-155. [DOI: 10.1016/j.neulet.2017.12.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 11/28/2017] [Accepted: 12/03/2017] [Indexed: 02/07/2023]
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13
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Huang Q, Mao XF, Wu HY, Liu H, Sun ML, Wang X, Wang YX. Cynandione A attenuates neuropathic pain through p38β MAPK-mediated spinal microglial expression of β-endorphin. Brain Behav Immun 2017; 62:64-77. [PMID: 28189715 DOI: 10.1016/j.bbi.2017.02.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 01/23/2017] [Accepted: 02/07/2017] [Indexed: 12/27/2022] Open
Abstract
Cynanchi Wilfordii Radix (baishouwu), a medicinal herb, has been widely used in Asia to treat a variety of diseases or illnesses. Cynandione A isolated from C. Wilfordii is the principle acetophenone and exhibits neuroprotective and anti-inflammatory activities. This study aims to evaluate the antihypersensitivity activities of cynandione A in neuropathy and explored its mechanisms of action. Intrathecal injection of cynandione A dose-dependently attenuated spinal nerve ligation-induced mechanical allodynia and thermal hyperalgesia, with maximal possible effects of 57% and 59%, ED50s of 14.9μg and 6.5μg, respectively. Intrathecal injection of cynandione A significantly increased β-endorphin levels in spinal cords of neuropathic rats and its treatment concentration-dependently induced β-endorphin expression in cultured primary microglia (but not in neurons or astrocytes), with EC50s of 38.8 and 20.0μM, respectively. Cynandione A also non-selectively upregulated phosphorylation of mitogen-activated protein kinases (MAPKs), including p38, extracellular signal regulated kinase (ERK1/2), and extracellular signal regulated kinase (JNK) in primary microglial culture; however, cynandione A-stimulated β-endorphin expression was completely inhibited by the specific p38 activation inhibitor SB203580, but not by the ERK1/2 or JNK activation inhibitors. Knockdown of spinal p38β but not p38α using siRNA also completely blocked cynandione A-induced β-endorphin expression in cultured microglial cells. Furthermore, cynandione A-induced antiallodynia in neuropathy was totally inhibited by the microglial inhibitor minocycline, SB203580, anti-β-endorphin antibody, and μ-opioid receptor antagonist CTAP (but not the κ- or δ-opioid receptor antagonist). These results suggest that cynandione A attenuates neuropathic pain through upregulation of spinal microglial expression β-endorphin via p38β MAPK activation.
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Affiliation(s)
- Qian Huang
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China.
| | - Xiao-Fang Mao
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China.
| | - Hai-Yun Wu
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China.
| | - Hao Liu
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China.
| | - Ming-Li Sun
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China.
| | - Xiao Wang
- Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan 250014, Shandong, China.
| | - Yong-Xiang Wang
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China.
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14
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Li TF, Wu HY, Wang YR, Li XY, Wang YX. Molecular signaling underlying bulleyaconitine A (BAA)-induced microglial expression of prodynorphin. Sci Rep 2017; 7:45056. [PMID: 28327597 PMCID: PMC5361206 DOI: 10.1038/srep45056] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 02/20/2017] [Indexed: 12/30/2022] Open
Abstract
Bulleyaconitine (BAA) has been shown to possess antinociceptive activities by stimulation of dynorphin A release from spinal microglia. This study investigated its underlying signal transduction mechanisms. The data showed that (1) BAA treatment induced phosphorylation of CREB (rather than NF-κB) and prodynorphin expression in cultured primary microglia, and antiallodynia in neuropathy, which were totally inhibited by the CREB inhibitor KG-501; (2) BAA upregulated phosphorylation of p38 (but not ERK or JNK), and the p38 inhibitor SB203580 (but not ERK or JNK inhibitor) and p38β gene silencer siRNA/p38β (but not siRNA/p38α) completely blocked BAA-induced p38 phosphorylation and/or prodynorphin expression, and antiallodynia; (3) BAA stimulated cAMP production and PKA phosphorylation, and the adenylate cyclase inhibitor DDA and PKA inhibitor H-89 entirely antagonized BAA-induced prodynorphin expression and antiallodynia; (4) The Gs-protein inhibitor NF449 completely inhibited BAA-increased cAMP level, prodynorphin expression and antiallodynia, whereas the antagonists of noradrenergic, corticotrophin-releasing factor, A1 adenosine, formyl peptide, D1/D2 dopamine, and glucagon like-peptide-1 receptors failed to block BAA-induced antiallodynia. The data indicate that BAA-induced microglial expression of prodynorphin is mediated by activation of the cAMP-PKA-p38β-CREB signaling pathway, suggesting that its possible target is a Gs-protein-coupled receptor - "aconitine receptor", although the chemical identity is not illustrated.
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Affiliation(s)
- Teng-Fei Li
- King’s Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China
| | - Hai-Yun Wu
- King’s Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China
| | - Yi-Rui Wang
- King’s Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China
| | - Xin-Yan Li
- King’s Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China
| | - Yong-Xiang Wang
- King’s Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai 200240, China
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15
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Huang Q, Mao XF, Wu HY, Li TF, Sun ML, Liu H, Wang YX. Bullatine A stimulates spinal microglial dynorphin A expression to produce anti-hypersensitivity in a variety of rat pain models. J Neuroinflammation 2016; 13:214. [PMID: 27577933 PMCID: PMC5006272 DOI: 10.1186/s12974-016-0696-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 08/20/2016] [Indexed: 12/27/2022] Open
Abstract
Background Aconiti brachypodi Radix (Xue-shang-yi-zhi-hao) has been prescribed to manage chronic pain, arthritis, and traumatic injuries. Bullatine A, a C20-diterpenoid alkaloid, is one of its principle effective compounds. This study aimed to investigate the anti-hypersensitivity of bullatine A in a variety of rat pain models and explore its mechanisms of action. Methods Rat neuropathic pain, inflammatory pain, diabetic neuropathic pain, and bone cancer pain models were used. Dynorphin A and pro-inflammatory cytokines were measured in the spinal cord and cultured primary microglia. Double immunofluorescence staining of dynorphin A and glial and neuronal cellular markers was also measured in the spinal cord. Results Subcutaneous and intrathecal injection of bullatine A dose-dependently attenuated spinal nerve ligation-, complete Freud’s adjuvant-, diabetes-, and bone cancer-induced mechanical allodynia and thermal hyperalgesia, with the efficacies of 45–70 % inhibition, and half-effective doses of 0.9–1.9 mg/kg for subcutaneous injection. However, bullatine A was not effective in blocking acute nociceptive response in the normal condition. Bullatine A specifically stimulated dynorphin A expression in microglia in the spinal cord in vivo and cultured primary microglia in vitro; the stimulatory effects were completely inhibited by the microglial inhibitor minocycline. In contrast, bullatine A did not have an inhibitory effect on peripheral nerve injury- or lipopolysaccharide-induced pro-inflammatory cytokine expression. The spinal anti-allodynic effects of bullatine A were entirely blocked by intrathecal injection of minocycline, the specific dynorphin A antiserum, and the selective k-opioid receptor antagonist. Conclusions We, for the first time, demonstrate that bullatine A specifically attenuates pain hypersensitivity, regardless of the pain models employed. The results also suggest that stimulation of spinal microglial dynorphin A expression mediates bullatine A anti-nociception in pain hypersensitivity conditions.
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Affiliation(s)
- Qian Huang
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Xiao-Fang Mao
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Hai-Yun Wu
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Teng-Fei Li
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Ming-Li Sun
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Hao Liu
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Yong-Xiang Wang
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China.
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16
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Leela SL, Srisawat C, Sreekanth GP, Noisakran S, Yenchitsomanus PT, Limjindaporn T. Drug repurposing of minocycline against dengue virus infection. Biochem Biophys Res Commun 2016; 478:410-416. [PMID: 27396621 DOI: 10.1016/j.bbrc.2016.07.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 07/06/2016] [Indexed: 12/30/2022]
Abstract
Dengue virus infection is one of the most common arthropod-borne viral diseases. A complex interplay between host and viral factors contributes to the severity of infection. The antiviral effects of three antibiotics, lomefloxacin, netilmicin, and minocycline, were examined in this study, and minocycline was found to be a promising drug. This antiviral effect was confirmed in all four serotypes of the virus. The effects of minocycline at various stages of the viral life cycle, such as during viral RNA synthesis, intracellular envelope protein expression, and the production of infectious virions, were examined and found to be significantly reduced by minocycline treatment. Minocycline also modulated host factors, including the phosphorylation of extracellular signal-regulated kinase1/2 (ERK1/2). The transcription of antiviral genes, including 2'-5'-oligoadenylate synthetase 1 (OAS1), 2'-5'-oligoadenylate synthetase 3 (OAS3), and interferon α (IFNA), was upregulated by minocycline treatment. Therefore, the antiviral activity of minocycline may have a potential clinical use against Dengue virus infection.
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Affiliation(s)
- Shilpa Lekshmi Leela
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand; Division of Molecular Medicine, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Chatchawan Srisawat
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | - Sansanee Noisakran
- Medical Biotechnology Unit, National Cancer Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand; Division of Dengue Hemorrhagic Fever Research, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Pa-Thai Yenchitsomanus
- Division of Molecular Medicine, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Thawornchai Limjindaporn
- Department of Anatomy, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
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Jang M, Lee MJ, Choi JH, Kim EJ, Nah SY, Kim HJ, Lee S, Lee SW, Kim YO, Cho IH. Ginsenoside Rb1 Attenuates Acute Inflammatory Nociception by Inhibition of Neuronal ERK Phosphorylation by Regulation of the Nrf2 and NF-κB Pathways. THE JOURNAL OF PAIN 2016; 17:282-97. [DOI: 10.1016/j.jpain.2015.10.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 10/06/2015] [Accepted: 10/14/2015] [Indexed: 12/12/2022]
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18
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Fan H, Li TF, Gong N, Wang YX. Shanzhiside methylester, the principle effective iridoid glycoside from the analgesic herb Lamiophlomis rotata, reduces neuropathic pain by stimulating spinal microglial β-endorphin expression. Neuropharmacology 2015; 101:98-109. [PMID: 26363192 DOI: 10.1016/j.neuropharm.2015.09.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 09/04/2015] [Accepted: 09/07/2015] [Indexed: 12/22/2022]
Abstract
Lamiophlomis rotata (L. rotata, Duyiwei) is an orally available Tibetan analgesic herb widely prescribed in China. Shanzhiside methylester (SM) is a principle effective iridoid glycoside of L. rotata and serves as a small molecule glucagon-like peptide-1 (GLP-1) receptor agonist. This study aims to evaluate the signal mechanisms underlying SM anti-allodynia, determine the ability of SM to induce anti-allodynic tolerance, and illustrate the interactions between SM and morphine, or SM and β-endorphin, in anti-allodynia and anti-allodynic tolerance. Intrathecal SM exerted dose-dependent and long-lasting (>4 h) anti-allodynic effects in spinal nerve injury-induced neuropathic rats, with a maximal inhibition of 49% and a projected ED50 of 40.4 μg. SM and the peptidic GLP-1 receptor agonist exenatide treatments over 7 days did not induce self-tolerance to anti-allodynia or cross-tolerance to morphine or β-endorphin. In contrast, morphine and β-endorphin induced self-tolerance and cross-tolerance to SM and exenatide. In the spinal dorsal horn and primary microglia, SM significantly evoked β-endorphin expression, which was completely prevented by the microglial inhibitor minocycline and p38 mitogen-activated protein kinase (MAPK) inhibitor SB203580. SM anti-allodynia was totally inhibited by the GLP-1 receptor antagonist exendin(9-39), minocycline, β-endorphin antiserum, μ-opioid receptor antagonist CTAP, and SB203580. SM and exenatide specifically activated spinal p38 MAPK phosphorylation. These results indicate that SM reduces neuropathic pain by activating spinal GLP-1 receptors and subsequently stimulating microglial β-endorphin expression via the p38 MAPK signaling. Stimulation of the endogenous β-endorphin expression may be a novel and effective strategy for the discovery and development of analgesics for the long-term treatment of chronic pain.
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Affiliation(s)
- Hui Fan
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Teng-Fei Li
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Nian Gong
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China
| | - Yong-Xiang Wang
- King's Lab, Shanghai Jiao Tong University School of Pharmacy, 800 Dongchuan Road, Shanghai, 200240, China.
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Borges G, Berrocoso E, Mico JA, Neto F. ERK1/2: Function, signaling and implication in pain and pain-related anxio-depressive disorders. Prog Neuropsychopharmacol Biol Psychiatry 2015; 60:77-92. [PMID: 25708652 DOI: 10.1016/j.pnpbp.2015.02.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 01/31/2015] [Accepted: 02/15/2015] [Indexed: 12/15/2022]
Abstract
Despite the increasing knowledge regarding pain modulation, the understanding of the mechanisms behind a complex and pathologic chronic pain condition is still insufficient. These knowledge gaps might result in ineffective therapeutic approaches to relieve painful sensations. As a result, severe untreated chronic pain frequently triggers the onset of new disorders such as depression and/or anxiety, and therefore, both the diagnosis and treatment of patients suffering from chronic pain become seriously compromised, prompting a self-perpetuating cycle of symptomatology. The extracellular signal-regulated kinases 1 and 2 (ERK1/2) are molecules strongly implicated in the somatic component of pain at the spinal cord level and have been emerging as mediators of the emotional-affective component as well. Although these molecules might represent good biomarkers, their use as pharmacological targets is still open to discussion as paradoxical information has been obtained. Here we review the current scientific literature regarding ERK1/2 signaling in the modulation of pain, depression and anxiety, including the emotional-affective spheres of the pain experience.
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Affiliation(s)
- Gisela Borges
- Neuropsycopharmacology and Psychobiology Research Group, Department of Neuroscience (Pharmacology and Psychiatry), University of Cádiz, 11003 Cádiz, Spain; Departamento de Biologia Experimental, Centro de Investigação Médica da Faculdade de Medicina da Universidade do Porto (CIM-FMUP), 4200-319 Porto, Portugal; Grupo de Morfofisiologia do Sistema Nervoso, Instituto de Biologia Molecular e Celular (IBMC), Porto, Portugal
| | - Esther Berrocoso
- Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Instituto de Salud Carlos III, Madrid, Spain; Neuropsychopharmacology and Psychobiology Research Group, Psychobiology Area, Department of Psychology, University of Cádiz, 11510 Cádiz, Spain
| | - Juan Antonio Mico
- Neuropsycopharmacology and Psychobiology Research Group, Department of Neuroscience (Pharmacology and Psychiatry), University of Cádiz, 11003 Cádiz, Spain; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Instituto de Salud Carlos III, Madrid, Spain
| | - Fani Neto
- Departamento de Biologia Experimental, Centro de Investigação Médica da Faculdade de Medicina da Universidade do Porto (CIM-FMUP), 4200-319 Porto, Portugal; Grupo de Morfofisiologia do Sistema Nervoso, Instituto de Biologia Molecular e Celular (IBMC), Porto, Portugal.
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20
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Ma F, Zhang L, Oz HS, Mashni M, Westlund KN. Dysregulated TNFα promotes cytokine proteome profile increases and bilateral orofacial hypersensitivity. Neuroscience 2015; 300:493-507. [PMID: 26033565 DOI: 10.1016/j.neuroscience.2015.05.046] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 05/19/2015] [Accepted: 05/20/2015] [Indexed: 12/30/2022]
Abstract
BACKGROUND Tumor necrosis factor alpha (TNFα) is increased in patients with headache, neuropathic pain, periodontal and temporomandibular disease. This study and others have utilized TNF receptor 1/2 (TNFR1/2) knockout (KO) animals to investigate the effect of TNFα dysregulation in generation and maintenance of chronic neuropathic pain. The present study determined the impact of TNFα dysregulation in a trigeminal inflammatory compression (TIC) nerve injury model comparing wild-type (WT) and TNFR1/2 KO mice. METHODS Chromic gut suture was inserted adjacent to the infraorbital nerve to induce the TIC model mechanical hypersensitivity. Cytokine proteome profiles demonstrated serology, and morphology explored microglial activation in trigeminal nucleus 10weeks post. RESULTS TIC injury induced ipsilateral whisker pad mechanical allodynia persisting throughout the 10-week study in both TNFR1/2 KO and WT mice. Delayed mechanical allodynia developed on the contralateral whisker pad in TNFR1/2 KO mice but not in WT mice. Proteomic profiling 10weeks after chronic TIC injury revealed TNFα, interleukin-1alpha (IL-1α), interleukin-5 (IL-5), interleukin-23 (IL-23), macrophage inflammatory protein-1β (MIP-1β), and granulocyte-macrophage colony-stimulating factor (GM-CSF) were increased more than 2-fold in TNFR1/2 KO mice compared to WT mice with TIC. Bilateral microglial activation in spinal trigeminal nucleus was detected only in TNFR1/2 KO mice. p38 mitogen-activated protein kinase (MAPK) inhibitor and microglial inhibitor minocycline reduced hypersensitivity. CONCLUSIONS The results suggest the dysregulated serum cytokine proteome profile and bilateral spinal trigeminal nucleus microglial activation are contributory to the bilateral mechanical hypersensitization in this chronic trigeminal neuropathic pain model in the mice with TNFα dysregulation. Data support involvement of both neurogenic and humoral influences in chronic neuropathic pain.
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Affiliation(s)
- F Ma
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536-0298, United States.
| | - L Zhang
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536-0298, United States.
| | - H S Oz
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536-0298, United States.
| | - M Mashni
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536-0298, United States.
| | - K N Westlund
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536-0298, United States.
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Yamamoto Y, Terayama R, Kishimoto N, Maruhama K, Mizutani M, Iida S, Sugimoto T. Activated Microglia Contribute to Convergent Nociceptive Inputs to Spinal Dorsal Horn Neurons and the Development of Neuropathic Pain. Neurochem Res 2015; 40:1000-12. [DOI: 10.1007/s11064-015-1555-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 02/25/2015] [Accepted: 03/06/2015] [Indexed: 12/14/2022]
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22
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Liu N, Zhang D, Zhu M, Luo S, Liu T. Minocycline inhibits hyperpolarization-activated currents in rat substantia gelatinosa neurons. Neuropharmacology 2015; 95:110-20. [PMID: 25777286 DOI: 10.1016/j.neuropharm.2015.03.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Revised: 03/04/2015] [Accepted: 03/05/2015] [Indexed: 12/30/2022]
Abstract
Minocycline is a widely used glial activation inhibitor that could suppress pain-related behaviors in a number of different pain animal models, yet, its analgesic mechanisms are not fully understood. Hyperpolarization-activated cation channel-induced Ih current plays an important role in neuronal excitability and pathological pain. In this study, we investigated the possible effect of minocycline on Ih of substantia gelatinosa neuron in superficial spinal dorsal horn by using whole-cell patch-clamp recording. We found that extracellular minocycline rapidly decreases Ih amplitude in a reversible and concentration-dependent manner (IC50 = 41 μM). By contrast, intracellular minocycline had no effect. Minocycline-induced inhibition of Ih was not affected by Na(+) channel blocker tetrodotoxin, glutamate-receptor antagonists (CNQX and D-APV), GABAA receptor antagonist (bicuculine methiodide), or glycine receptor antagonist (strychnine). Minocycline also caused a negative shift in the activation curve of Ih, but did not alter the reversal potential. Moreover, minocycline slowed down the inter-spike depolarizing slope and produced a robust decrease in the rate of action potential firing. Together, these results illustrate a novel cellular mechanism underlying minocycline's analgesic effect by inhibiting Ih currents of spinal dorsal horn neurons.
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Affiliation(s)
- Nana Liu
- Department of Pediatrics, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - Daying Zhang
- Department of Pain Clinic, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - Mengye Zhu
- Department of Pain Clinic, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - Shiwen Luo
- Center for Laboratory Medicine, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - Tao Liu
- Department of Pediatrics, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, China; Center for Laboratory Medicine, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, China.
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Alfonso Romero-Sandoval E, Sweitzer S. Nonneuronal central mechanisms of pain: glia and immune response. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2015; 131:325-58. [PMID: 25744678 DOI: 10.1016/bs.pmbts.2014.11.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The role of central glial cells in the mechanisms underlying pain has been intensively studied in the last two decades. Most studies on glia and pain focused on the potential detrimental role of glial cells following noxious stimulus/insults manifested as an "activation" or a "reactive" state (increase in glial marker expression and production of proinflammatory/nociceptive molecules). Therefore, "activated" or "reactive" glial cells became a target for the future generation of drugs to treat chronic pain. Several glial modulators that reduce the activation of glial cells have shown great efficacy in multiple animal (rodents mostly) models of pain (acute, subacute, chronic, inflammatory, neuropathic, surgical, etc.). These encouraging findings inspired clinical trials that have been completed in the last 5 years. Unfortunately, all clinical trials with these glial modulators have failed to demonstrate efficacy for the treatment of pain. New lines of investigation and elegant experimental designs are shedding light on alternative glial functions, which demonstrate that "glial reactivity" is not necessarily deleterious in some pathological conditions. New strategies to validate findings through our current animal models are necessary to enhance the translational value of our preclinical studies. Also, more studies using human subjects would enhance our understanding of glial cells in the context of pain. This chapter explores the available literature to objectively ponder the potential role of glial cells in human pain conditions.
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Affiliation(s)
- E Alfonso Romero-Sandoval
- Department of Pharmaceutical and Administrative Sciences, Presbyterian College School of Pharmacy, Clinton, South Carolina, USA.
| | - Sarah Sweitzer
- Department of Pharmaceutical and Administrative Sciences, Presbyterian College School of Pharmacy, Clinton, South Carolina, USA
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Yan X, Jiang E, Weng HR. Activation of toll like receptor 4 attenuates GABA synthesis and postsynaptic GABA receptor activities in the spinal dorsal horn via releasing interleukin-1 beta. J Neuroinflammation 2015; 12:222. [PMID: 25571780 PMCID: PMC4302431 DOI: 10.1186/s12974-014-0222-3] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 12/13/2014] [Indexed: 12/26/2022] Open
Abstract
Toll like receptor 4 (TLR4) is an innate immune pattern recognition receptor, expressed predominantly on microglia in the CNS. Activation of spinal TLR4 plays a critical role in the genesis of pathological pain induced by nerve injury, bone cancer, and tissue inflammation. Currently, it remains unknown how synaptic activities in the spinal dorsal horn are regulated by TLR4 receptors. Through recording GABAergic currents in neurons and glial glutamate transporter currents in astrocytes in rodent spinal slices, we determined whether and how TLR4 modulates GABAergic synaptic activities in the superficial spinal dorsal horn. We found that activation of TLR4 by lipopolysaccharide (LPS) reduces GABAergic synaptic activities through both presynaptic and postsynaptic mechanisms. Specifically, LPS causes the release of IL-1β from microglia. IL-1β in turn suppresses GABA receptor activities at the postsynaptic site through activating protein kinase C (PKC) in neurons. GABA synthesis at the presynaptic site is reduced upon activation of TLR4. Glial glutamate transporter activities are suppressed by IL-1β and PKC activation induced by LPS. The suppression of glial glutamate transporter activities leads to a deficiency of glutamine supply, which results in an attenuation of the glutamate-glutamine cycle-dependent GABA synthesis. These findings shed light on understanding synaptic plasticity induced by activation of TLR4 under neuroinflammation and identify GABA receptors, glial glutamate transporters, IL-1β and PKC as therapeutic targets to abrogate abnormal neuronal activities following activation of TLR4 in pathological pain conditions.
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Affiliation(s)
- Xisheng Yan
- Department of Pharmaceutical and Biomedical Sciences, The University of Georgia College of Pharmacy, 240 West Green Street, Athens, GA, 30602, USA. .,Department of Pain Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA. .,Department of Cardiovascular Medicine, the Third Hospital of Wuhan, Wuhan, Hubei Province, China.
| | - Enshe Jiang
- Department of Pain Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA. .,Institute of Public Hygiene, Henan University Nursing School, Kaifeng, China.
| | - Han-Rong Weng
- Department of Pharmaceutical and Biomedical Sciences, The University of Georgia College of Pharmacy, 240 West Green Street, Athens, GA, 30602, USA. .,Department of Pain Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.
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Hung VK, Tai LW, Qiu Q, Luo X, Wong K, Chung SK, Cheung C. Over-expression of astrocytic ET-1 attenuates neuropathic pain by inhibition of ERK1/2 and Akt(s) via activation of ETA receptor. Mol Cell Neurosci 2014; 60:26-35. [DOI: 10.1016/j.mcn.2014.02.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 01/28/2014] [Accepted: 02/21/2014] [Indexed: 12/13/2022] Open
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26
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Analgesic effect of minocycline in rat model of inflammation-induced visceral pain. Eur J Pharmacol 2014; 727:87-98. [PMID: 24485889 DOI: 10.1016/j.ejphar.2014.01.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 01/08/2014] [Accepted: 01/12/2014] [Indexed: 12/30/2022]
Abstract
The present study investigates the analgesic effect of minocycline, a semi-synthetic tetracycline antibiotic, in a rat model of inflammation-induced visceral pain. Inflammation was induced in male rats by intracolonic administration of tri-nitrobenzenesulphonic acid (TNBS). Visceral hyperalgesia was assessed by comparing the viscero-motor response (VMR) to graded colorectal distension (CRD) prior and post 7 days after TNBS treatment. Electrophysiology recordings from CRD-sensitive pelvic nerve afferents (PNA) and lumbo-sacral (LS) spinal neurons were performed in naïve and inflamed rats. Colonic inflammation produced visceral hyperalgesia characterized by increase in the VMRs to CRD accompanied with simultaneous activation of microglia in the spinal cord and satellite glial cells (SGCs) in the dorsal root ganglions (DRGs). Selectively inhibiting the glial activation following inflammation by araC (Arabinofuranosyl Cytidine) prevented the development of visceral hyperalgesia. Intrathecal minocycline significantly attenuated the VMR to CRD in inflamed rats, whereas systemic minocycline produced a delayed effect. In electrophysiology experiments, minocycline significantly attenuated the mechanotransduction of CRD-sensitive PNAs and the responses of CRD-sensitive LS spinal neurons in TNBS-treated rats. While the spinal effect of minocycline was observed within 5min of administration, systemic injection of the drug produced a delayed effect (60min) in inflamed rats. Interestingly, minocycline did not exhibit analgesic effect in naïve, non-inflamed rats. The results demonstrate that intrathecal injection of minocycline can effectively attenuate inflammation-induced visceral hyperalgesia. Minocycline might as well act on neuronal targets in the spinal cord of inflamed rats, in addition to the widely reported glial inhibitory action to produce analgesia.
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