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Pola P, Frezza A, Gavioli EC, Calò G, Ruzza C. Effects of Stress Exposure to Pain Perception in Pre-Clinical Studies: Focus on the Nociceptin/Orphanin FQ-NOP Receptor System. Brain Sci 2024; 14:936. [PMID: 39335430 PMCID: PMC11431041 DOI: 10.3390/brainsci14090936] [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: 07/15/2024] [Revised: 09/16/2024] [Accepted: 09/17/2024] [Indexed: 09/30/2024] Open
Abstract
Exposure to physical and psychological stress modulates pain transmission in a dual manner. Stress-induced analgesia (SIA) refers to the reduction in pain sensitivity that can occur in response to acute stress. On the contrary, chronic stress exposure may lead to a phenomenon named stress-induced hyperalgesia (SIH). SIH is a clinically relevant phenomenon since it has been well documented that physical and psychological stress exacerbates pain in patients with several chronic pain syndromes, including migraine. The availability of animal models of SIA and SIH is of high importance for understanding the biological mechanisms leading to these phenomena and for the identification of pharmacological targets useful to alleviate the burden of stress-exacerbated chronic pain. Among these targets, the nociceptin/orphanin FQ (N/OFQ)-N/OFQ peptide (NOP) receptor system has been identified as a key modulator of both pain transmission and stress susceptibility. This review describes first the experimental approaches to induce SIA and SIH in rodents. The second part of the manuscript summarizes the scientific evidence that suggests the N/OFQ-NOP receptor system as a player in the stress-pain interaction and candidates NOP antagonists as useful drugs to mitigate the detrimental effects of stress exposure on pain perception.
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Affiliation(s)
- Pietro Pola
- Department of Neuroscience and Rehabilitation, University of Ferrara, 44121 Ferrara, Italy
| | - Alessia Frezza
- Department of Neuroscience and Rehabilitation, University of Ferrara, 44121 Ferrara, Italy
| | - Elaine C Gavioli
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Natal 59078-900, Brazil
| | - Girolamo Calò
- Department of Pharmaceutical and Pharmacological Sciences, University of Padua, 35131 Padua, Italy
| | - Chiara Ruzza
- Department of Neuroscience and Rehabilitation, University of Ferrara, 44121 Ferrara, Italy
- LTTA Laboratory for Advanced Therapies, Technopole of Ferrara, 44121 Ferrara, Italy
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Wakatsuki K, Kiryu-Seo S, Yasui M, Yokota H, Kida H, Konishi H, Kiyama H. Repeated cold stress, an animal model for fibromyalgia, elicits proprioceptor-induced chronic pain with microglial activation in mice. J Neuroinflammation 2024; 21:25. [PMID: 38238800 PMCID: PMC10795366 DOI: 10.1186/s12974-024-03018-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/09/2024] [Indexed: 01/22/2024] Open
Abstract
BACKGROUND Fibromyalgia is characterized by chronic pain, fatigue, and other somatic symptoms. We have recently revealed that proprioceptor hyperactivation induces chronic pain in a rat model of myalgic encephalomyelitis. The present study explores whether similar proprioceptor-induced pain is elicited in a mouse model of fibromyalgia. METHODS Repeated cold stress (RCS) was used as a fibromyalgia model. Pain behavior was examined using the von Frey test, and neuronal activation was examined immunohistochemically as activating transcription factor (ATF)3 expression. The Atf3:BAC transgenic mouse, in which mitochondria in hyperactivated neurons are specifically labeled by green fluorescent protein, was used to trace the activated neuronal circuit. PLX3397 (pexidartinib) was used for microglial suppression. RESULTS RCS elicited long-lasting pain in mice. ATF3, a marker of cellular hyperactivity and injury, was expressed in the lumbar dorsal root ganglion (DRG) 2 days after RCS initiation; the majority of ATF3-expressing DRG neurons were tropomyosin receptor kinase C- and/or vesicular glutamate transporter 1-positive proprioceptors. Microglial activation and increased numbers of microglia were observed in the medial part of the nucleus proprius 5 days after RCS initiation, and in the dorsal region of the ventral horn 7 days after RCS. In the ventral horn, only a subset of motor neurons was positive for ATF3; these neurons were surrounded by activated microglia. A retrograde tracer study revealed that ATF3-positive motor neurons projected to the intrinsic muscles of the foot (IMF). Using Atf3:BAC transgenic mice, we traced hyperactivated neuronal circuits along the reflex arc. Green fluorescent protein labeling was observed in proprioceptive DRG neurons and their processes originating from the IMF, as well as in motor neurons projecting to the IMF. Microglial activation was observed along this reflex arc, and PLX3397-induced microglial ablation significantly suppressed pain behavior. CONCLUSION Proprioceptor hyperactivation leads to local microglial activation along the reflex arc; this prolonged microglial activation may be responsible for chronic pain in the present model. Proprioceptor-induced microglial activation might be the common cause of chronic pain in both the fibromyalgia and myalgic encephalomyelitis models, although the experimental models are different.
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Affiliation(s)
- Koji Wakatsuki
- Department of Functional Anatomy and Neuroscience, Nagoya University Graduate School of Medicine, 65 Tsurumaicho, Showa-Ku, Nagoya, Aichi, 466-8550, Japan
| | - Sumiko Kiryu-Seo
- Department of Functional Anatomy and Neuroscience, Nagoya University Graduate School of Medicine, 65 Tsurumaicho, Showa-Ku, Nagoya, Aichi, 466-8550, Japan.
| | - Masaya Yasui
- Department of Functional Anatomy and Neuroscience, Nagoya University Graduate School of Medicine, 65 Tsurumaicho, Showa-Ku, Nagoya, Aichi, 466-8550, Japan
- Department of Judo Seifuku and Health Sciences, Tokoha University, 1230 Miyakoda-Cho, Kita-Ku, Hamamatsu, Shizuoka, 431-2102, Japan
| | - Hiroki Yokota
- Department of Mechanical Engineering, Meijo University, 1-501 Shiogamaguchi, Tenpaku-Ku, Nagoya, Aichi, 468-0073, Japan
| | - Haruku Kida
- Department of Functional Anatomy and Neuroscience, Nagoya University Graduate School of Medicine, 65 Tsurumaicho, Showa-Ku, Nagoya, Aichi, 466-8550, Japan
| | - Hiroyuki Konishi
- Department of Functional Anatomy and Neuroscience, Nagoya University Graduate School of Medicine, 65 Tsurumaicho, Showa-Ku, Nagoya, Aichi, 466-8550, Japan
| | - Hiroshi Kiyama
- Department of Functional Anatomy and Neuroscience, Nagoya University Graduate School of Medicine, 65 Tsurumaicho, Showa-Ku, Nagoya, Aichi, 466-8550, Japan.
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Nasu T, Kainuma R, Ota H, Mizumura K, Taguchi T. Increased nociceptive behaviors and spinal c-Fos expression in the formalin test in a rat repeated cold stress model. Neurosci Res 2024; 198:30-38. [PMID: 37392833 DOI: 10.1016/j.neures.2023.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 06/24/2023] [Accepted: 06/27/2023] [Indexed: 07/03/2023]
Abstract
Repeated cold stress (RCS) can trigger the development of fibromyalgia (FM)-like symptoms, including persistent deep-tissue pain, although nociceptive changes to the skin have not been fully characterized. Using a rat RCS model, we investigated nociceptive behaviors induced by noxious mechanical, thermal, and chemical stimuli applied to plantar skin. Neuronal activation in the spinal dorsal horn was examined using the formalin pain test. In rats exposed to RCS, nociceptive behavioral hypersensitivity was observed in all modalities of cutaneous noxious stimuli: the mechanical withdrawal threshold was decreased, and the heat withdrawal latency was shortened one day after the cessation of stress. The duration of nocifensive behaviors in the formalin test was prolonged in phase II but not in phase I. The number of c-Fos-positive neurons increased in the entire dorsal horn laminae I-VI, ipsilateral, but not contralateral, to formalin injection at the L3-L5 segments. The duration of nocifensive behavior in phase II was significantly and positively correlated with the number of c-Fos-positive neurons in laminae I-II. These results demonstrate that cutaneous nociception is facilitated in rats exposed to RCS for a short time and that the spinal dorsal horn neurons are hyperactivated by cutaneous formalin in the RCS model.
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Affiliation(s)
- Teruaki Nasu
- Department of Physical Therapy, College of Life and Health Sciences, Chubu University, Kasugai 487-8501, Japan; Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Riku Kainuma
- Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare, Niigata 950-3198, Japan
| | - Hiroki Ota
- Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare, Niigata 950-3198, Japan; Institute for Human Movement and Medical Sciences (IHMMS), Niigata University of Health and Welfare, Niigata 950-3198, Japan
| | - Kazue Mizumura
- Department of Physical Therapy, College of Life and Health Sciences, Chubu University, Kasugai 487-8501, Japan; Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan; Department of Physiology, Nihon University School of Dentistry, Tokyo 101-8310, Japan
| | - Toru Taguchi
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan; Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare, Niigata 950-3198, Japan; Institute for Human Movement and Medical Sciences (IHMMS), Niigata University of Health and Welfare, Niigata 950-3198, Japan.
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Nasu T, Hori A, Hotta N, Kihara C, Kubo A, Katanosaka K, Suzuki M, Mizumura K. Vacuolar-ATPase-mediated muscle acidification caused muscular mechanical nociceptive hypersensitivity after chronic stress in rats, which involved extracellular matrix proteoglycan and ASIC3. Sci Rep 2023; 13:13585. [PMID: 37604935 PMCID: PMC10442418 DOI: 10.1038/s41598-023-39633-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 07/28/2023] [Indexed: 08/23/2023] Open
Abstract
Although widespread pain, such as fibromyalgia, is considered to have a central cause, peripheral input is important. We used a rat repeated cold stress (RCS) model with many characteristics common to fibromyalgia and studied the possible involvement of decreased muscle pH in muscle mechanical hyperalgesia. After a 5-day RCS, the muscle pH and the muscular mechanical withdrawal threshold (MMWT) decreased significantly. Subcutaneously injected specific inhibitor of vacuolar ATPase (V-ATPase), bafilomycin A1, reversed both changes almost completely. It also reversed the increased mechanical response of muscle thin-fibre afferents after RCS. These results show that V-ATPase activation caused muscle pH drop, which led to mechanical hypersensitivity after RCS. Since extracellular matrix proteoglycan and acid sensitive ion channels (TRPV1 and ASIC3) have been considered as possible mechanisms for sensitizing/activating nociceptors by protons, we investigated their involvement. Manipulating the extracellular matrix proteoglycan with chondroitin sulfate and chondroitinase ABC reversed the MMWT decrease after RCS, supporting the involvement of the extracellular mechanism. Inhibiting ASIC3, but not TRPV1, reversed the decreased MMWT after RCS, and ASIC3 mRNA and protein in the dorsal root ganglia were upregulated, indicating ASIC3 involvement. These findings suggest that extracellular mechanism and ASIC3 play essential roles in proton-induced mechanical hyperalgesia after RCS.
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Affiliation(s)
- Teruaki Nasu
- Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Matsumoto-Cho, Kasugai, 487-8501, Japan
| | - Amane Hori
- Graduate School of Life and Health Sciences, Chubu University, Matsumoto-Cho, Kasugai, 487-8501, Japan
- Japan Society for the Promotion of Science, Kojimachi, Chiyoda-Ku, Tokyo, 102-8472, Japan
| | - Norio Hotta
- Department of Lifelong Sports and Health Sciences, College of Life and Health Sciences, Chubu University, Matsumoto-Cho, Kasugai, 487-8501, Japan
| | - Chiaki Kihara
- Graduate School of Life and Health Sciences, Chubu University, Matsumoto-Cho, Kasugai, 487-8501, Japan
| | - Asako Kubo
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
- Department of Acupuncture and Moxibustion, Faculty of Rehabilitation, Niigata University of Health and Welfare, Niigata, 950-3198, Japan
| | - Kimiaki Katanosaka
- Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Matsumoto-Cho, Kasugai, 487-8501, Japan
| | - Masamitsu Suzuki
- Central Research Laboratories, ZERIA Pharmaceutical Co. Ltd., 2512-1 Numagami, Oshikiri, Kumagaya, Saitama, 360-0111, Japan
| | - Kazue Mizumura
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan.
- Department of Physical Therapy, College of Life and Health Sciences, Chubu University, Matsumoto-Cho, Kasugai, 487-8501, Japan.
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Fukazawa A, Hori A, Hotta N, Katanosaka K, Estrada JA, Ishizawa R, Kim HK, Iwamoto GA, Smith SA, Vongpatanasin W, Mizuno M. Antagonism of TRPV4 channels partially reduces mechanotransduction in rat skeletal muscle afferents. J Physiol 2023; 601:1407-1424. [PMID: 36869605 PMCID: PMC10106437 DOI: 10.1113/jp284026] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 03/02/2023] [Indexed: 03/05/2023] Open
Abstract
Mechanical distortion of working skeletal muscle induces sympathoexcitation via thin fibre afferents, a reflex response known as the skeletal muscle mechanoreflex. However, to date, the receptor ion channels responsible for mechanotransduction in skeletal muscle remain largely undetermined. Transient receptor potential vanilloid 4 (TRPV4) is known to sense mechanical stimuli such as shear stress or osmotic pressure in various organs. It is hypothesized that TRPV4 in thin-fibre primary afferents innervating skeletal muscle is involved in mechanotransduction. Fluorescence immunostaining revealed that 20.1 ± 10.1% of TRPV4 positive neurons were small dorsal root ganglion (DRG) neurons that were DiI-labelled, and among them 9.5 ± 6.1% of TRPV4 co-localized with the C-fibre marker peripherin. In vitro whole-cell patch clamp recordings from cultured rat DRG neurons demonstrated that mechanically activated current amplitude was significantly attenuated after the application of the TRPV4 antagonist HC067047 compared to control (P = 0.004). Such reductions were also observed in single-fibre recordings from a muscle-nerve ex vivo preparation where HC067047 significantly decreased afferent discharge to mechanical stimulation (P = 0.007). Likewise, in an in vivo decerebrate rat preparation, the renal sympathetic nerve activity (RSNA) and mean arterial pressure (MAP) responses to passive stretch of hindlimb muscle were significantly reduced by intra-arterial injection of HC067047 (ΔRSNA: P = 0.019, ΔMAP: P = 0.002). The findings suggest that TRPV4 plays an important role in mechanotransduction contributing to the cardiovascular responses evoked by the skeletal muscle mechanoreflex during exercise. KEY POINTS: Although a mechanical stimulus to skeletal muscle reflexively activates the sympathetic nervous system, the receptors responsible for mechanotransduction in skeletal muscle thin fibre afferents have not been fully identified. Evidence suggests that TRPV4 is a mechanosensitive channel that plays an important role in mechanotransduction within various organs. Immunocytochemical staining demonstrates that TRPV4 is expressed in group IV skeletal muscle afferents. In addition, we show that the TRPV4 antagonist HC067047 decreases the responsiveness of thin fibre afferents to mechanical stimulation at the muscle tissue level as well as at the level of dorsal root ganglion neurons. Moreover, we demonstrate that intra-arterial HC067047 injection attenuates the sympathetic and pressor responses to passive muscle stretch in decerebrate rats. These data suggest that antagonism of TRPV4 attenuates mechanotransduction in skeletal muscle afferents. The present study demonstrates a probable physiological role for TRPV4 in the regulation of mechanical sensation in somatosensory thin fibre muscle afferents.
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Affiliation(s)
- Ayumi Fukazawa
- Department of Applied Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Amane Hori
- Graduate School of Life and Health Sciences, Chubu University, Kasugai 487-850, Japan
- Japan Society for the Promotion of Science, Tokyo 102-8472, Japan
| | - Norio Hotta
- Graduate School of Life and Health Sciences, Chubu University, Kasugai 487-850, Japan
- College of Life and Health Sciences, Chubu University, Kasugai 487-850, Japan
| | - Kimiaki Katanosaka
- Graduate School of Life and Health Sciences, Chubu University, Kasugai 487-850, Japan
- College of Life and Health Sciences, Chubu University, Kasugai 487-850, Japan
| | - Juan A. Estrada
- Department of Applied Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Rie Ishizawa
- Department of Applied Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Han-Kyul Kim
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Gary A. Iwamoto
- Department of Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Scott A. Smith
- Department of Applied Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Wanpen Vongpatanasin
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Masaki Mizuno
- Department of Applied Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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Bourke SL, Schlag AK, O'Sullivan SE, Nutt DJ, Finn DP. Cannabinoids and the endocannabinoid system in fibromyalgia: A review of preclinical and clinical research. Pharmacol Ther 2022; 240:108216. [PMID: 35609718 DOI: 10.1016/j.pharmthera.2022.108216] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 05/03/2022] [Accepted: 05/17/2022] [Indexed: 12/14/2022]
Abstract
Characterised by chronic widespread musculoskeletal pain, generalised hyperalgesia, and psychological distress, fibromyalgia (FM) is a significant unmet clinical need. The endogenous cannabinoid system plays an important role in modulating both pain and the stress response. Here, we appraise the evidence, from preclinical and clinical studies, for a role of the endocannabinoid system in FM and the therapeutic potential of targeting the endocannabinoid system. While many animal models have been used to study FM, the reserpine-induced myalgia model has emerged as perhaps the most translatable to the clinical phenotype. Inhibition of fatty acid amide hydrolase (FAAH) has shown promise in preclinical studies, ameliorating pain- and anxiety-related behaviour . Clinically, there is evidence for alterations in the endocannabinoid system in patients with FM, including single nucleotide polymorphisms and increased levels of circulating endocannabinoids and related N-acylethanolamines. Single entity cannabinoids, cannabis, and cannabis-based medicines in patients with FM show promise therapeutically but limitations in methodology and lack of longitudinal studies to assess efficacy and tolerability preclude the current recommendation for their use in patients with FM. Gaps in the literature that warrant further investigation are discussed, particularly the need for further development of animal models with high validity for the multifaceted nature of FM, balanced studies to eliminate sex-bias in preclinical research, and ultimately, better translation between preclinical and clinical research.
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Affiliation(s)
- Stephanie L Bourke
- Pharmacology and Therapeutics, School of Medicine, Centre for Pain Research and Galway Neuroscience Centre, National University of Ireland, Galway, Ireland
| | - Anne Katrin Schlag
- Drug Science, St. Peters House, Wood Street, London, UK; Faculty of Medicine, Department of Brain Sciences, Imperial College London, UK
| | | | - David J Nutt
- Drug Science, St. Peters House, Wood Street, London, UK; Faculty of Medicine, Department of Brain Sciences, Imperial College London, UK
| | - David P Finn
- Pharmacology and Therapeutics, School of Medicine, Centre for Pain Research and Galway Neuroscience Centre, National University of Ireland, Galway, Ireland.
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Uta D, Tsuboshima K, Nishijo H, Mizumura K, Taguchi T. Neuronal Sensitization and Synaptic Facilitation in the Superficial Dorsal Horn of a Rat Reserpine-induced Pain Model. Neuroscience 2021; 479:125-139. [PMID: 34673142 DOI: 10.1016/j.neuroscience.2021.10.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 10/05/2021] [Accepted: 10/08/2021] [Indexed: 12/23/2022]
Abstract
Chronic widespread pain is one of the important issues to be solved in medical practice. Impaired spinal descending pain inhibitory system due to decreased monoamine neurotransmitters is assumed to cause nociceptive hypersensitivities in chronic painful conditions like that described in patients with fibromyalgia (FM). However, response behaviors and synaptic transmission of the spinal dorsal horn neurons in response to reserpine remain to be clarified. Here we examined the activities of superficial dorsal horn (SDH) neurons, as well as excitatory and inhibitory postsynaptic inputs to SDH neurons, using a putative rat model of FM that was established by injecting reserpine. Extracellular recordings in vivo revealed that SDH neurons were sensitized to mechanical stimulation applied to the neurons' receptive fields, and the mechanically sensitized neurons were spontaneously more active. The sensitizing effect was evident 1 day and 3 days after the reserpine treatment, but subsided 5 days after the treatment or later. Using patch-clamp recordings in vivo, spontaneous excitatory postsynaptic currents (sEPSCs) to SDH neurons were found to increase in the pain model, while spontaneous inhibitory postsynaptic currents (sIPSCs) to SDH neurons decreased. These results demonstrate that the SDH neurons were strongly sensitized in response to the reserpine treatment, and that increased excitatory and decreased inhibitory postsynaptic inputs could be responsible for the spinal nociceptive hypersensitivity in the putative FM model.
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Affiliation(s)
- Daisuke Uta
- Department of Applied Pharmacology, Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan
| | - Katsuyuki Tsuboshima
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Hisao Nishijo
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Kazue Mizumura
- Department of Physiology, Nihon University School of Dentistry, Tokyo 101-8310, Japan
| | - Toru Taguchi
- Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare, Niigata 950-3198, Japan; Institute for Human Movement and Medical Sciences (IHMMS), Niigata University of Health and Welfare, Niigata 950-3198, Japan.
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Yamaguchi C, Yamamoto D, Fujimaru Y, Asano T, Takaoka A. Acetaminophen Exerts an Analgesic Effect on Muscular Hyperalgesia in Repeated Cold-Stressed Rats through the Enhancement of the Descending Pain Inhibitory System Involving Spinal 5-HT 3 and Noradrenergic α 2 Receptors. Biol Pharm Bull 2021; 44:1067-1074. [PMID: 34135207 DOI: 10.1248/bpb.b21-00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Musculoskeletal and psychological complaints have increased with the widespread use of visual display terminals, and musculoskeletal pain is known to be closely related to stress. One method of experimentally inducing persistent muscle pain is repeated cold stress (RCS), and animals exposed to such stress exhibit a dysfunction in the descending pain inhibitory system. Acetaminophen (N-acetyl-p-aminophenol; APAP) is widely used to relieve several types of pain, including musculoskeletal pain, and is available as an OTC drug. However, the mechanism underlying its analgesic action has not yet been fully elucidated. In this study, we compared the analgesic effect of APAP on RCS-induced muscular hyperalgesia with those of other analgesics to identify its mechanism of action. The daily oral administration of APAP significantly suppressed the decrease in the mechanical withdrawal threshold caused by RCS, similar to the results for neurotropin but not for the cyclooxygenase inhibitor ibuprofen (IBP). Moreover, the intrathecal administration of antagonists of the 5-hydroxytryptamine (5-HT)3 receptor or α2-adrenoceptor significantly abolished the analgesic effect of APAP but not of IBP. These results suggest that the analgesic effect of APAP on RCS-induced muscular pain might be exerted due to the activation of the descending pathways involving the spinal 5-HT3 receptor or α2-adrenoceptor.
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Affiliation(s)
| | - Daisuke Yamamoto
- Self-Medication R&D Laboratories, Taisho Pharmaceutical Co., Ltd
| | - Yukiko Fujimaru
- Self-Medication R&D Laboratories, Taisho Pharmaceutical Co., Ltd
| | - Toshiki Asano
- Self-Medication R&D Laboratories, Taisho Pharmaceutical Co., Ltd
| | - Akiko Takaoka
- Self-Medication R&D Laboratories, Taisho Pharmaceutical Co., Ltd
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Pagliusi M, Bonet IJM, Lemes JBP, Oliveira ALL, Carvalho NS, Tambeli CH, Parada CA, Sartori CR. Social defeat stress-induced hyperalgesia is mediated by nav 1.8 + nociceptive fibers. Neurosci Lett 2020; 729:135006. [PMID: 32387758 DOI: 10.1016/j.neulet.2020.135006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/17/2020] [Accepted: 04/20/2020] [Indexed: 10/24/2022]
Abstract
Recently the voltage-gated sodium (Nav) channels began to be studied as possible targets for analgesic drugs. In addition, specific Nav 1.8 blockers are currently being used to treat some types of chronic pain pathologies such as neuropathies and fibromyalgia. Nav 1.8+ fibers convey nociceptive information to brain structures belonging to the limbic system, which is involved in the pathophysiology of major depressive disorders. From this, using a model of chronic social defeat stress (SDS) and intrathecal injections of Nav 1.8 antisense, this study investigated the possible involvement of Nav 1.8+ nociceptive fibers in SDS- induced hyperalgesia in C57/BL mice. Our results showed that SDS induced a depressive-like behavior of social avoidance and increased the sensitivity to mechanical (electronic von Frey test) and chemical (capsaicin test) nociceptive stimuli. We also showed that intrathecal injection of Nav 1.8 antisense reversed the SDS-induced hyperalgesia as demonstrated by both, mechanical and chemical nociceptive tests. We confirmed the antisense efficacy and specificity in a separate no-defeated cohort through real-time PCR, which showed a significant reduction of Nav 1.8 mRNA and no reduction of Nav 1.7 and Nav 1.9 in the L4, L5 and L6 dorsal root ganglia (DRG). The present study advances the understanding of SDS-induced hyperalgesia, which seems to be dependent on Nav 1.8+ nociceptive fibers.
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Affiliation(s)
- Marco Pagliusi
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil
| | - Ivan José Magayewski Bonet
- Department of Oral and Maxillofacial Surgery,University of California San Francisco, 513 Parnassus Ave, Box 0440 S709, San Francisco, CA 94143, United States
| | - Júlia Borges Paes Lemes
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil
| | - Anna Lethicia Lima Oliveira
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil
| | - Nathalia Santos Carvalho
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil
| | - Claudia Herrera Tambeli
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil
| | - Carlos Amilcar Parada
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil
| | - Cesar Renato Sartori
- Department of Structural and Functional Biology, State University of Campinas, Rua Monteiro Lobato, 255, Cidade Universitaria Zeferino Vaz, Box 6109, Campinas, SP 13083-865, Brazil.
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