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Song Y, Zhou M, Xiong J, Huang R, Shen W, Zhan T, Xie Y, Gao Y, Xiong W. Effects of carbamazepine on BDNF expression in trigeminal ganglia and serum in rats with trigeminal neuralgia. Zhong Nan Da Xue Xue Bao Yi Xue Ban 2024; 49:11-20. [PMID: 38615161 PMCID: PMC11017024 DOI: 10.11817/j.issn.1672-7347.2024.230278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Indexed: 04/15/2024]
Abstract
OBJECTIVES Trigeminal neuralgia (TN) is a severe chronic neuropathic pain that mainly affects the distribution area of the trigeminal nerve with limited treating efficacy. There are numerous treatments for TN, but currently the main clinical approach is to suppress pain by carbamazepine (CBZ). Brain-derived neurotrophic factor (BDNF) is closely related to chronic pain. This study aims to determine the effects of CBZ treatment on BDNF expression in both the trigeminal ganglion (TG) and serum of TN via a chronic constriction injury of the infraorbital nerve (ION-CCI) rat model. METHODS The ION-CCI models were established in male Sprague-Dawley rats and were randomly divided into a sham group, a TN group, a TN+low-dose CBZ treatment group (TN+20 mg/kg CBZ group), a TN+medium-dose CBZ treatment group (TN+40 mg/kg CBZ group), and a TN+high-dose CBZ treatment group (TN+80 mg/kg CBZ group). The mechanical pain threshold in each group of rats was measured regularly before and after surgery. The expressions of BDNF and tyrosine kinase receptor B (TrkB) mRNA in TGs of rats in different groups were determined by real-time PCR, and the expression of BDNF protein on neurons in TGs was observed by immunofluorescence. Western Blotting was used to detect the protein expression of BDNF, TrkB, extracellular regulated protein kinases (ERK), and phospho-extracellular regulated protein kinases (p-ERK) in TGs of rats in different groups. The expression of BDNF in the serum of rats in different groups was detected by enzyme-linked immunosorbent assay (ELISA). RESULTS The results of mechanical pain sensitivity showed that there was no significant difference in the mechanical pain threshold in the right facial sensory area of the experimental rats in each group before surgery (all P>0.05). From the 3rd day after operation, the mechanical pain threshold of rats in the TN group was significantly lower than that in the sham group (all P<0.01), and the mechanical pain threshold of rats in the TN+80 mg/kg CBZ group, the TN+40 mg/kg CBZ group, and the TN+20 CBZ mg/kg group was higher than that in the TN group (all P<0.05). The BDNF and TrkB mRNA and protein expressions in TGs of rats in the TN group were higher than those in the sham group (all P<0.05), and those in the TN+80 mg/kg CBZ group, the TN+40 mg/kg CBZ group, and the TN+20 mg/kg CBZ group were lower than the TN group (all P<0.05). The p-ERK levels in TG of rats in the TN+80 mg/kg CBZ group, the TN+40 mg/kg CBZ group, and the TN+20 mg/kg CBZ group were significantly decreased compared with the TN group (all P<0.05). The BDNF and neuron-specific nuclear protein (NeuN) were mainly co-expressed in neuron of TGs in the TN group and they were significantly higher than those in the sham group (all P<0.05). The co-labeled expressions of BDNF and NeuN in TGs of the TN+ 80 mg/kg CBZ group, the TN+40 mg/kg CBZ group, and the TN+20 mg/kg CBZ group were lower than those in the TN group (all P<0.05). The results of ELISA showed that the level of BDNF in the serum of the TN group was significantly higher than that in the sham group (P<0.05). The levels of BDNF in the TN+80 mg/kg CBZ group, the TN+40 mg/kg CBZ group, and the TN+20 mg/kg CBZ group were lower than those in the TN group (all P<0.05). Spearman correlation analysis showed that the BDNF level in serum was negatively correlated with mechanical pain threshold (r=-0.650, P<0.01). CONCLUSIONS CBZ treatment can inhibit the expression of BDNF and TrkB in the TGs of TN rats, reduce the level of BDNF in serum of TN rats and the phosphorylation of ERK signaling pathway, so as to inhibit TN. The serum level of BDNF can be considered as an indicator for the diagnosis and prognosis of TN.
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Affiliation(s)
- Yufeng Song
- Department of Preventive Dentistry and Health Care, Affiliated Stomatological Hospital, Nanchang University; Jiangxi Province Key Laboratory of Oral Biomedicine; Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006.
| | - Min Zhou
- Department of Preventive Dentistry and Health Care, Affiliated Stomatological Hospital, Nanchang University; Jiangxi Province Key Laboratory of Oral Biomedicine; Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006.
| | - Jiawen Xiong
- Department of Preventive Dentistry and Health Care, Affiliated Stomatological Hospital, Nanchang University; Jiangxi Province Key Laboratory of Oral Biomedicine; Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006
| | - Ruoyu Huang
- Department of Preventive Dentistry and Health Care, Affiliated Stomatological Hospital, Nanchang University; Jiangxi Province Key Laboratory of Oral Biomedicine; Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006
| | - Wenhao Shen
- Department of Preventive Dentistry and Health Care, Affiliated Stomatological Hospital, Nanchang University; Jiangxi Province Key Laboratory of Oral Biomedicine; Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006
| | - Ting Zhan
- Department of Physiology, School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China
| | - Yuting Xie
- Department of Physiology, School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China
| | - Yun Gao
- Department of Physiology, School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China
| | - Wei Xiong
- Department of Preventive Dentistry and Health Care, Affiliated Stomatological Hospital, Nanchang University; Jiangxi Province Key Laboratory of Oral Biomedicine; Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006.
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Wei S, Liao D, Hu J. Inhibition of miR-144-3p/FOXO1 Attenuates Diabetic Keratopathy Via Modulating Autophagy and Apoptosis. Invest Ophthalmol Vis Sci 2024; 65:1. [PMID: 38165707 PMCID: PMC10768711 DOI: 10.1167/iovs.65.1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 12/05/2023] [Indexed: 01/04/2024] Open
Abstract
Purpose Diabetic keratopathy (DK) is a vision-threatening disease that occurs in people with diabetes. Mounting evidence indicates that microRNAs (miRNAs) are indispensable in nerve regeneration within DK. Herein, the role of miRNAs associated with DK, especially focusing on autophagy and apoptosis regulation, was investigated. Methods To identify differentially expressed miRNAs, we performed miRNA sequencing on trigeminal ganglion (TG) tissues derived from streptozotocin-induced type 1 diabetic mellitus (T1DM) and normal mice. MiR-144-3p was chosen for the subsequent experiments. To explore the regulatory role of miR-144-3p in DK, miRNA antagomir was utilized to inhibit miR-144-3p expression. Bioinformatic tools were used to predict the target genes of miR-144-3p, and a dual-luciferase reporter assay was then applied for validation. Autophagy and apoptosis activities were measured utilizing TUNEL staining, immunofluorescence staining, and Western blotting. Results Overall, 56 differentially expressed miRNAs were detected in diabetic versus control mice. In the diabetic mouse TG tissue, miR-144-3p expression was aberrantly enhanced, whereas decreasing its expression contributed to improved diabetic corneal re-epithelialization and nerve regeneration. Fork-head Box O1 (FOXO1) was validated as a target gene of miR-144-3p. Overexpression of FOXO1 could prevent both inadequate autophagy and excessive apoptosis in DK. Consistently, a specific miR-144-3p inhibition enhanced autophagy and prevented apoptosis in DK. Conclusions In this study, our research confirmed the target binding relationship between miR-144-3p and FOXO1. Inhibiting miR-144-3p might modulate autophagy and apoptosis, which could generate positive outcomes for corneal nerves via targeting FOXO1 in DK.
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Affiliation(s)
- Shijia Wei
- Department of Ophthalmology, Fujian Medical University Union Hospital, Fuzhou, China
| | - Danling Liao
- Department of Ophthalmology, Fujian Medical University Union Hospital, Fuzhou, China
| | - Jianzhang Hu
- Department of Ophthalmology, Fujian Medical University Union Hospital, Fuzhou, China
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Stöckl SK, de Col R, Filipovic MR, Messlinger K. Nitroxyl Delivered by Angeli's Salt Causes Short-Lasting Activation Followed by Long-Lasting Deactivation of Meningeal Afferents in Models of Headache Generation. Int J Mol Sci 2022; 23:ijms23042330. [PMID: 35216445 PMCID: PMC8878050 DOI: 10.3390/ijms23042330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/16/2022] [Accepted: 02/18/2022] [Indexed: 11/16/2022] Open
Abstract
The role of TRPA1 receptor channels in meningeal nociception underlying the generation of headaches is still unclear. Activating as well as inhibitory effects of TRPA1 agonists have been reported in animal models of headache. The aim of the present study was to clarify the effect of the TRPA1 agonist nitroxyl (HNO) delivered by Angeli's salt in two rodent models of meningeal nociception. Single fibre recordings were performed using half-skull preparations of mice (C57BL/6) in vitro. Angeli's salt solution (AS, 300 µM) caused short-lasting vigorous increases in neuronal activity of primary meningeal afferents, followed by deactivation and desensitisation. These effects were similar in TRPA1 knockout and even more pronounced in TRPA1/TRPV1 double-knockout mice in comparison to wild-type mice. The activity of spinal trigeminal neurons with afferent input from the dura mater was recorded in vivo in anesthetised rats. AS (300 µM) or the TRPA1 agonist acrolein (100 and 300 µM) was applied to the exposed dura mater. AS caused no significant changes in spontaneous activity, while the mechanically evoked activity was reduced after acrolein application. These results do not confirm the assumption that activation of trigeminal TRPA1 receptor channels triggers the generation of headaches or contributes to its aggravation. Instead, there is evidence that TRPA1 activation may have an inhibitory function in the nociceptive trigeminal system.
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Affiliation(s)
- Stephanie K. Stöckl
- Institute of Physiology and Pathophysiology, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; (S.K.S.); (R.d.C.)
| | - Roberto de Col
- Institute of Physiology and Pathophysiology, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; (S.K.S.); (R.d.C.)
| | - Milos R. Filipovic
- Leibniz Institute for Analytical Sciences, ISAS e.V., 44227 Dortmund, Germany;
| | - Karl Messlinger
- Institute of Physiology and Pathophysiology, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; (S.K.S.); (R.d.C.)
- Correspondence: ; Tel.: +49-160-5521215
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Buapratoom A, Wanasuntronwong A, Khongsombat O, Tantisira MH. Anti-nociceptive effects of ECa 233 a standardized extract of Centella asiatica (L.) Urban on chronic neuropathic orofacial pain in mice. J Ethnopharmacol 2022; 283:114737. [PMID: 34648902 DOI: 10.1016/j.jep.2021.114737] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 09/30/2021] [Accepted: 10/09/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE ECa 233 is a standardized extract of Centella asiatica (L.) Urban, a herb traditionally used to treat a number of diseases including neurological disorders. Accordingly, ECa 233 showed benefits on animal models of cognitive deficits, chronic stress and Parkinson's disease. Analgesic activity of ECa 233 was shown in Tail's flick test in rodent and relieving aphthous ulcer pain in man. Moreover, acute and sub-chronic toxicity testing in rodents and pharmacokinetic study in healthy volunteers, clinical trial phase I demonstrated good safety profiles of ECa 233. AIM OF THE STUDY This study aims to evaluate the anti-nociceptive effects of ECa 233 and its synergistic effect with gabapentin on chronic neuropathic orofacial pain after 3 weeks infraorbital nerve chronic constriction injury in mice. The peripheral and central nociceptive activities are also examined. MATERIALS AND METHODS Chronic neuropathic orofacial pain was induced by 3 weeks infraorbital nerve chronic constriction injury. Mice were treated with ECa 233 (30, 100 and 300 mg/kg) and gabapentin (10 mg/kg) by oral gavage starting on day 21 and going on for 14 consecutive days. Mechanical hyperalgesia and allodynia were measured on day 7, 14, 21, 28 and 35 after infraorbital nerve chronic constriction injury. At the end of the experiment, mice were observed for the sedative effect using the locomotor activity, the calcitonin gen-related peptide in trigeminal ganglion and c-fos expression in trigeminal nucleus caudalis were investigated after euthanasia. RESULTS Infraorbital nerve chronic constriction injury gradually induced marked ipsilateral mechanical hyperalgesia and allodynia. The maximum hyperalgesia and allodynia response presented on day 21 and the response was remained constant until day 35. Treatment with either 300 mg/kg ECa 233 or 10 mg/kg gabapentin were able to attenuate mechanical hyperalgesia and allodynia. The downregulation of calcitonin gen-related peptide on ipsilateral trigeminal ganglion were observed in ECa 233 at 100 and 300 mg/kg and 10 mg/kg gabapentin-treated groups. The c-fos expression on ipsilateral trigeminal nucleus caudalis was also decreased in 300 mg/kg ECa 233 and 10 mg/kg gabapentin-treated groups. CONCLUSION ECa 233 reduced hyperalgesia and allodynia by modulating the peripheral calcitonin gen-related peptide expression consequently alleviate the nociceptive activity in trigeminal nucleus caudalis. Further clinical trial to proof ECa 233's efficacy in neuropathic pain in man as well as possible attributable mechanism of action should be further investigated.
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Affiliation(s)
- Ananya Buapratoom
- Department of Physiology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand.
| | - Aree Wanasuntronwong
- Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
| | - Onrawee Khongsombat
- Department of Physiology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand; The Center of Excellence for Innovation in Chemistry (PERCH-CIC), Ministry of Higher Education, Science, Research and Innovation, Thailand.
| | - Mayuree H Tantisira
- Division of Pharmacology, Faculty of Pharmaceutical Sciences, Burapha University, Chonburi, Thailand.
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Guerrero-Toro C, Koroleva K, Ermakova E, Gafurov O, Abushik P, Tavi P, Sitdikova G, Giniatullin R. Testing the Role of Glutamate NMDA Receptors in Peripheral Trigeminal Nociception Implicated in Migraine Pain. Int J Mol Sci 2022; 23:ijms23031529. [PMID: 35163452 PMCID: PMC8835926 DOI: 10.3390/ijms23031529] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/20/2022] [Accepted: 01/26/2022] [Indexed: 01/18/2023] Open
Abstract
The pro-nociceptive role of glutamate in the CNS in migraine pathophysiology is well established. Glutamate, released from trigeminal afferents, activates second order nociceptive neurons in the brainstem. However, the function of peripheral glutamate receptors in the trigeminovascular system suggested as the origin site for migraine pain, is less known. In the current project, we used calcium imaging and patch clamp recordings from trigeminal ganglion (TG) neurons, immunolabelling, CGRP assay and direct electrophysiological recordings from rat meningeal afferents to investigate the role of glutamate in trigeminal nociception. Glutamate, aspartate, and, to a lesser extent, NMDA under free-magnesium conditions, evoked calcium transients in a fraction of isolated TG neurons, indicating functional expression of NMDA receptors. The fraction of NMDA sensitive neurons was increased by the migraine mediator CGRP. NMDA also activated slowly desensitizing currents in 37% of TG neurons. However, neither glutamate nor NMDA changed the level of extracellular CGRP. TG neurons expressed both GluN2A and GluN2B subunits of NMDA receptors. In addition, after removal of magnesium, NMDA activated persistent spiking activity in a fraction of trigeminal nerve fibers in meninges. Thus, glutamate activates NMDA receptors in somas of TG neurons and their meningeal nerve terminals in magnesium-dependent manner. These findings suggest that peripherally released glutamate can promote excitation of meningeal afferents implicated in generation of migraine pain in conditions of inherited or acquired reduced magnesium blockage of NMDA channels and support the usage of magnesium supplements in migraine.
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Affiliation(s)
- Cindy Guerrero-Toro
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (C.G.-T.); (K.K.); (P.A.); (P.T.)
| | - Kseniia Koroleva
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (C.G.-T.); (K.K.); (P.A.); (P.T.)
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (E.E.); (O.G.)
| | - Elizaveta Ermakova
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (E.E.); (O.G.)
| | - Oleg Gafurov
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (E.E.); (O.G.)
| | - Polina Abushik
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (C.G.-T.); (K.K.); (P.A.); (P.T.)
- Laboratory of Comparative Neurophysiology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 194223 Saint Petersburg, Russia
| | - Pasi Tavi
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (C.G.-T.); (K.K.); (P.A.); (P.T.)
| | - Guzel Sitdikova
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (E.E.); (O.G.)
- Correspondence: (G.S.); (R.G.); Tel.: +7-9033061092 (G.S.); +358-403553665 (R.G.)
| | - Rashid Giniatullin
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (C.G.-T.); (K.K.); (P.A.); (P.T.)
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (E.E.); (O.G.)
- Correspondence: (G.S.); (R.G.); Tel.: +7-9033061092 (G.S.); +358-403553665 (R.G.)
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Belinskaia M, Zurawski T, Kaza SK, Antoniazzi C, Dolly JO, Lawrence GW. NGF Enhances CGRP Release Evoked by Capsaicin from Rat Trigeminal Neurons: Differential Inhibition by SNAP-25-Cleaving Proteases. Int J Mol Sci 2022; 23:ijms23020892. [PMID: 35055082 PMCID: PMC8778182 DOI: 10.3390/ijms23020892] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/08/2022] [Accepted: 01/11/2022] [Indexed: 11/23/2022] Open
Abstract
Nerve growth factor (NGF) is known to intensify pain in various ways, so perturbing pertinent effects without negating its essential influences on neuronal functions could help the search for much-needed analgesics. Towards this goal, cultured neurons from neonatal rat trigeminal ganglia—a locus for craniofacial sensory nerves—were used to examine how NGF affects the Ca2+-dependent release of a pain mediator, calcitonin gene-related peptide (CGRP), that is triggered by activating a key signal transducer, transient receptor potential vanilloid 1 (TRPV1) with capsaicin (CAP). Measurements utilised neurons fed with or deprived of NGF for 2 days. Acute re-introduction of NGF induced Ca2+-dependent CGRP exocytosis that was inhibited by botulinum neurotoxin type A (BoNT/A) or a chimera of/E and/A (/EA), which truncated SNAP-25 (synaptosomal-associated protein with Mr = 25 k) at distinct sites. NGF additionally caused a Ca2+-independent enhancement of the neuropeptide release evoked by low concentrations (<100 nM) of CAP, but only marginally increased the peak response to ≥100 nM. Notably, BoNT/A inhibited CGRP exocytosis evoked by low but not high CAP concentrations, whereas/EA effectively reduced responses up to 1 µM CAP and inhibited to a greater extent its enhancement by NGF. In addition to establishing that sensitisation of sensory neurons to CAP by NGF is dependent on SNARE-mediated membrane fusion, insights were gleaned into the differential ability of two regions in the C-terminus of SNAP-25 (181–197 and 198–206) to support CAP-evoked Ca2+-dependent exocytosis at different intensities of stimulation.
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Zhou Y, Song Z, Chen S, Yao F, Liu J, Ouyang Z, Liao Z. Mechanism of Catechol-O-methyltransferase Regulating Orofacial Pain Induced by Tooth Movement. Biomed Res Int 2021; 2021:4229491. [PMID: 34725639 PMCID: PMC8557060 DOI: 10.1155/2021/4229491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/15/2021] [Accepted: 10/07/2021] [Indexed: 12/30/2022]
Abstract
OBJECTIVE To explore the mechanism of catechol-O-methyltransferase (COMT) in tooth movement pain. METHODS The experimental groups were randomly allocated into the healthy control, sham operation, model, model+shCOMT experimental, model+shCOMT control, and model+COMT antagonist groups. A tooth movement pain model was established. The pain stimulation and behavior test were performed. The duration of grooming behavior was determined. The appropriate experimental force and duration for application were selected. COMT shRNA vector was constructed and packaged as adenovirus. The shCOMT adenovirus was injected into the left infraorbital foramen. Seven days later, the trigeminal ganglia of all treatment groups were obtained. The COMT and IL-17 expressions were detected by western blot. The appropriate COMT antagonist concentration was selected. The pathological results of each group were detected by HE staining. The tooth movement distance was determined. The COMT gene expression was detected by FISH. The COMT and IL-17 expressions in the right trigeminal ganglion tissue of each group were detected by western blot. RESULTS The 60 g force and 14-day duration required the lowest stimulus intensity, the duration of grooming behavior was the longest, and the effect on COMT and IL-17 was the most significant. In the model group, formation of digestive cavity was seen in the trigeminal ganglion tissue, with infiltration of inflammatory cells, upregulation of the COMT and IL-17 expressions, and significant increase in the tooth movement distance. Compared with the model group, the shCOMT experimental group and the COMT antagonist group significantly improved the trigeminal ganglion tissue injury, significantly decreased the tooth movement distance, and significantly inhibited the COMT and IL-17 expressions. CONCLUSION The efficiency of tooth movement can be influenced by interfering the COMT-related gene expression. This proves that the COMT system can regulate the orthodontic tooth movement pain.
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Affiliation(s)
- Yonglong Zhou
- Department of Orthodontics, School of Stomatology, The Key Laboratory of Oral Biomedicine, Affliated Stomatological Hospital of Nanchang University, No. 49 Fuzhou Road, Nanchang, 330006 Jiangxi Province, China
| | - Zhiping Song
- Department of Anesthesia, The First Affiliated Hospital of Nanchang University, No. 17 Yongwaizheng Street, Nanchang, 330006 Jiangxi Province, China
| | - Shibiao Chen
- Department of Anesthesia, The First Affiliated Hospital of Nanchang University, No. 17 Yongwaizheng Street, Nanchang, 330006 Jiangxi Province, China
| | - Fen Yao
- Department of Orthodontics, School of Stomatology, The Key Laboratory of Oral Biomedicine, Affliated Stomatological Hospital of Nanchang University, No. 49 Fuzhou Road, Nanchang, 330006 Jiangxi Province, China
| | - Jian Liu
- Department of Orthodontics, School of Stomatology, The Key Laboratory of Oral Biomedicine, Affliated Stomatological Hospital of Nanchang University, No. 49 Fuzhou Road, Nanchang, 330006 Jiangxi Province, China
| | - Zhiqiang Ouyang
- Department of Orthodontics, School of Stomatology, The Key Laboratory of Oral Biomedicine, Affliated Stomatological Hospital of Nanchang University, No. 49 Fuzhou Road, Nanchang, 330006 Jiangxi Province, China
| | - Zhengyu Liao
- Department of Orthodontics, School of Stomatology, The Key Laboratory of Oral Biomedicine, Affliated Stomatological Hospital of Nanchang University, No. 49 Fuzhou Road, Nanchang, 330006 Jiangxi Province, China
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Inoue H, Kuroda H, Ofusa W, Oyama S, Kimura M, Ichinohe T, Shibukawa Y. Functional Coupling between the P2X 7 Receptor and Pannexin-1 Channel in Rat Trigeminal Ganglion Neurons. Int J Mol Sci 2021; 22:ijms22115978. [PMID: 34205953 PMCID: PMC8198496 DOI: 10.3390/ijms22115978] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/19/2021] [Accepted: 05/27/2021] [Indexed: 11/16/2022] Open
Abstract
The ionotropic P2X receptor, P2X7, is believed to regulate and/or generate nociceptive pain, and pain in several neuropathological diseases. Although there is a known relationship between P2X7 receptor activity and pain sensing, its detailed functional properties in trigeminal ganglion (TG) neurons remains unclear. We examined the electrophysiological and pharmacological characteristics of the P2X7 receptor and its functional coupling with other P2X receptors and pannexin-1 (PANX1) channels in primary cultured rat TG neurons, using whole-cell patch-clamp recordings. Application of ATP and Bz-ATP induced long-lasting biphasic inward currents that were more sensitive to extracellular Bz-ATP than ATP, indicating that the current was carried by P2X7 receptors. While the biphasic current densities of the first and second components were increased by Bz-ATP in a concentration dependent manner; current duration was only affected in the second component. These currents were significantly inhibited by P2X7 receptor antagonists, while only the second component was inhibited by P2X1, 3, and 4 receptor antagonists, PANX1 channel inhibitors, and extracellular ATPase. Taken together, our data suggests that autocrine or paracrine signaling via the P2X7-PANX1-P2X receptor/channel complex may play important roles in several pain sensing pathways via long-lasting neuronal activity driven by extracellular high-concentration ATP following tissue damage in the orofacial area.
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Affiliation(s)
- Hiroyuki Inoue
- Department of Physiology, Tokyo Dental College, Tokyo 101-0061, Japan; (H.I.); (H.K.); (W.O.); (S.O.); (M.K.)
- Department of Dental Anesthesiology, Tokyo Dental College, Tokyo 101-0061, Japan;
| | - Hidetaka Kuroda
- Department of Physiology, Tokyo Dental College, Tokyo 101-0061, Japan; (H.I.); (H.K.); (W.O.); (S.O.); (M.K.)
- Department of Dental Anesthesiology, Kanagawa Dental University, Kanagawa 238-8580, Japan
| | - Wataru Ofusa
- Department of Physiology, Tokyo Dental College, Tokyo 101-0061, Japan; (H.I.); (H.K.); (W.O.); (S.O.); (M.K.)
| | - Sadao Oyama
- Department of Physiology, Tokyo Dental College, Tokyo 101-0061, Japan; (H.I.); (H.K.); (W.O.); (S.O.); (M.K.)
| | - Maki Kimura
- Department of Physiology, Tokyo Dental College, Tokyo 101-0061, Japan; (H.I.); (H.K.); (W.O.); (S.O.); (M.K.)
| | - Tatsuya Ichinohe
- Department of Dental Anesthesiology, Tokyo Dental College, Tokyo 101-0061, Japan;
| | - Yoshiyuki Shibukawa
- Department of Physiology, Tokyo Dental College, Tokyo 101-0061, Japan; (H.I.); (H.K.); (W.O.); (S.O.); (M.K.)
- Correspondence:
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Matsuo T, Isosaka T, Hayashi Y, Tang L, Doi A, Yasuda A, Hayashi M, Lee CY, Cao L, Kutsuna N, Matsunaga S, Matsuda T, Yao I, Setou M, Kanagawa D, Higasa K, Ikawa M, Liu Q, Kobayakawa R, Kobayakawa K. Thiazoline-related innate fear stimuli orchestrate hypothermia and anti-hypoxia via sensory TRPA1 activation. Nat Commun 2021; 12:2074. [PMID: 33824316 PMCID: PMC8024280 DOI: 10.1038/s41467-021-22205-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 02/22/2021] [Indexed: 01/09/2023] Open
Abstract
Thiazoline-related innate fear-eliciting compounds (tFOs) orchestrate hypothermia, hypometabolism, and anti-hypoxia, which enable survival in lethal hypoxic conditions. Here, we show that most of these effects are severely attenuated in transient receptor potential ankyrin 1 (Trpa1) knockout mice. TFO-induced hypothermia involves the Trpa1-mediated trigeminal/vagal pathways and non-Trpa1 olfactory pathway. TFOs activate Trpa1-positive sensory pathways projecting from trigeminal and vagal ganglia to the spinal trigeminal nucleus (Sp5) and nucleus of the solitary tract (NTS), and their artificial activation induces hypothermia. TFO presentation activates the NTS-Parabrachial nucleus pathway to induce hypothermia and hypometabolism; this activation was suppressed in Trpa1 knockout mice. TRPA1 activation is insufficient to trigger tFO-mediated anti-hypoxic effects; Sp5/NTS activation is also necessary. Accordingly, we find a novel molecule that enables mice to survive in a lethal hypoxic condition ten times longer than known tFOs. Combinations of appropriate tFOs and TRPA1 command intrinsic physiological responses relevant to survival fate.
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Affiliation(s)
- Tomohiko Matsuo
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Tomoko Isosaka
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Yuichiro Hayashi
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Lijun Tang
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Akihiro Doi
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Aiko Yasuda
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Mikio Hayashi
- Department of Cellular and Functional Biology, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Chia-Ying Lee
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Liqin Cao
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Natsumaro Kutsuna
- Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Chiba, Japan
- LPixel Inc., Tokyo, Japan
| | - Sachihiro Matsunaga
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Chiba, Japan
| | - Takeshi Matsuda
- Department of Optical Imaging, Institute for Medical Photonics Research, PMPERC and IMIC, Hamamatsu University School of Medicine, Shizuoka, Japan
| | - Ikuko Yao
- Department of Optical Imaging, Institute for Medical Photonics Research, PMPERC and IMIC, Hamamatsu University School of Medicine, Shizuoka, Japan
| | - Mitsuyoshi Setou
- Department of Cellular and Molecular Anatomy and IMIC, Hamamatsu University School of Medicine, Shizuoka, Japan
| | - Dai Kanagawa
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Koichiro Higasa
- Department of Genome Analysis, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan
| | - Masahito Ikawa
- Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Qinghua Liu
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan.
- National Institute of Biological Sciences, Beijing, China.
| | - Reiko Kobayakawa
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan.
| | - Ko Kobayakawa
- Department of Functional Neuroscience, Institute of Biomedical Science, Kansai Medical University, Osaka, Japan.
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10
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Dolgorukova A, Isaeva JE, Verbitskaya E, Lyubashina OA, Giniatullin RА, Sokolov AY. Differential effects of the Piezo1 agonist Yoda1 in the trigeminovascular system: An electrophysiological and intravital microscopy study in rats. Exp Neurol 2021; 339:113634. [PMID: 33549548 DOI: 10.1016/j.expneurol.2021.113634] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 01/18/2021] [Accepted: 02/01/2021] [Indexed: 01/15/2023]
Abstract
Migraine is associated with the activation and sensitisation of the trigeminovascular system and is often accompanied by mechanical hyperalgesia and allodynia. The mechanisms of mechanotransduction during a migraine attack are yet unknown. We have proposed that the ion channel Piezo1 may be involved, since it is expressed in endothelial cells as well as in trigeminal ganglion neurons, and thus, may contribute to the activation of both the vascular and neuronal component of the trigeminovascular system. We took advantage of extracellular recordings from the trigeminocervical complex - a key relay centre in the migraine pain pathway, to directly assess the impact of the differently applied Piezo1 agonist Yoda1 on the sensory processing at the spinal level. At a low dose, Yoda1 slightly facilitated the ongoing firing of central trigeminovascular neurons, however, at a high dose, this substance contributed to the suppression of their activity. Using intravital microscopy, we have revealed that Yoda1 at high dose can also induce the dilation of meningeal arteries innervated by trigeminal afferents. Collectively, here we have identified both neuronal and vascular modulation via selective activation of mechanosensitive Piezo1 channels, which provide new evidence in favour of the Piezo1 role in migraine pathogenesis. We propose several mechanisms that may underlie the revealed effects of Yoda1.
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Affiliation(s)
- Antonina Dolgorukova
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg 197022, Russia.
| | - Julia E Isaeva
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg 197022, Russia
| | - Elena Verbitskaya
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg 197022, Russia
| | - Olga A Lyubashina
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg 197022, Russia; Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, Saint Petersburg 199034, Russia
| | - Rashid А Giniatullin
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio 70211, Finland
| | - Alexey Y Sokolov
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg 197022, Russia; Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, Saint Petersburg 199034, Russia
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11
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Andreou AP, Leese C, Greco R, Demartini C, Corrie E, Simsek D, Zanaboni A, Koroleva K, Lloyd JO, Lambru G, Doran C, Gafurov O, Seward E, Giniatullin R, Tassorelli C, Davletov B. Double-Binding Botulinum Molecule with Reduced Muscle Paralysis: Evaluation in In Vitro and In Vivo Models of Migraine. Neurotherapeutics 2021; 18:556-568. [PMID: 33205382 PMCID: PMC8116399 DOI: 10.1007/s13311-020-00967-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2020] [Indexed: 12/29/2022] Open
Abstract
With a prevalence of 15%, migraine is the most common neurological disorder and among the most disabling diseases, taking into account years lived with disability. Current oral medications for migraine show variable effects and are frequently associated with intolerable side effects, leading to the dissatisfaction of both patients and doctors. Injectable therapeutics, which include calcitonin gene-related peptide-targeting monoclonal antibodies and botulinum neurotoxin A (BoNT/A), provide a new paradigm for treatment of chronic migraine but are effective only in approximately 50% of subjects. Here, we investigated a novel engineered botulinum molecule with markedly reduced muscle paralyzing properties which could be beneficial for the treatment of migraine. This stapled botulinum molecule with duplicated binding domain-binary toxin-AA (BiTox/AA)-cleaves synaptosomal-associated protein 25 with a similar efficacy to BoNT/A in neurons; however, the paralyzing effect of BiTox/AA was 100 times less when compared to native BoNT/A following muscle injection. The performance of BiTox/AA was evaluated in cellular and animal models of migraine. BiTox/AA inhibited electrical nerve fiber activity in rat meningeal preparations while, in the trigeminovascular model, BiTox/AA raised electrical and mechanical stimulation thresholds in Aδ- and C-fiber nociceptors. In the rat glyceryl trinitrate (GTN) model, BiTox/AA proved effective in inhibiting GTN-induced hyperalgesia in the orofacial formalin test. We conclude that the engineered botulinum molecule provides a useful prototype for designing advanced future therapeutics for an improved efficacy in the treatment of migraine.
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Affiliation(s)
- Anna P Andreou
- Headache Research-Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Headache Centre, Guy's and St Thomas's NHS Foundation Trust, King's Health Partners, London, UK
| | - Charlotte Leese
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Rosaria Greco
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
| | - Chiara Demartini
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Eve Corrie
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Deniz Simsek
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Anna Zanaboni
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | | | - Joseph O Lloyd
- Headache Research-Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Giorgio Lambru
- Headache Research-Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Headache Centre, Guy's and St Thomas's NHS Foundation Trust, King's Health Partners, London, UK
| | - Ciara Doran
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Oleg Gafurov
- Laboratory of Neurobiology, Kazan University, Kazan, Russia
| | - Elizabeth Seward
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Rashid Giniatullin
- Laboratory of Neurobiology, Kazan University, Kazan, Russia
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Cristina Tassorelli
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Bazbek Davletov
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK.
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12
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Tzeng HR, Lee MT, Fan PC, Knutson DE, Lai TH, Sieghart W, Cook J, Chiou LC. α6GABA A Receptor Positive Modulators Alleviate Migraine-like Grimaces in Mice via Compensating GABAergic Deficits in Trigeminal Ganglia. Neurotherapeutics 2021; 18:569-585. [PMID: 33111258 PMCID: PMC8116449 DOI: 10.1007/s13311-020-00951-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2020] [Indexed: 11/29/2022] Open
Abstract
Migraine is caused by hyperactivity of the trigeminovascular system, where trigeminal ganglia (TG) play an important role. This hyperactivity might originate from an underfunctional GABAergic system in TG. To investigate this possibility, we adapted a mouse model of migraine by inducing migraine-like grimaces in male mice via repeated injections of nitroglycerin (NTG, 10 mg/kg, i.p.), once every 2 days, for up to 5 sessions. Migraine-like facial pain scores were measured using the mouse grimace scale. Repeated NTG treatments in mice caused significant increases in migraine-like grimaces that were aborted and prevented by two anti-migraine agents sumatriptan and topiramate, respectively. After 5 sessions of NTG injections, the GABA-synthesizing enzyme, 65-kDa glutamate decarboxylase (GAD65), but not the GABA transporter 1 (GAT1) or the α6 subunit-containing GABAA receptors (α6GABAARs), was downregulated in mouse TG tissues. Taking advantage of the unaffected TG α6GABAAR expression in NTG-treated mice, we demonstrated that an α6GABAAR-selective positive allosteric modulator (PAM), DK-I-56-1, exhibited both abortive and prophylactic effects, comparable to those of sumatriptan and topiramate, respectively, in this migraine-mimicking mouse model. The brain-impermeable furosemide significantly prevented the effects of DK-I-56-1, suggesting its peripheral site of action, likely via preventing α6GABAAR modulation in TG. Results suggest that a decreased GABA synthesis caused by the reduced GAD65 expression in TG contributes to the trigeminovascular activation in this repeated NTG-induced migraine-mimicking model and that the unaltered α6GABAARs in TG are potential targets for migraine treatment. Thus, α6GABAAR-selective PAMs are potential anti-migraine agents for both abortive and preventive therapies.
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Affiliation(s)
- Hung-Ruei Tzeng
- Department of Pharmacology, Graduate Institute of Pharmacology College of Medicine, National Taiwan University, No. 1, Jen-Ai Rd., Section 1, Taipei, 10051, Taiwan
| | - Ming Tatt Lee
- Graduate Institute of Brain and Mind Sciences College of Medicine, National Taiwan University, Taipei, 10051, Taiwan
- Faculty of Pharmaceutical Sciences, UCSI University, 56000, Kuala Lumpur, Malaysia
| | - Pi-Chuan Fan
- Department of Pediatrics, College of Medicine, National Taiwan University, Taipei, 10051, Taiwan
- Department of Pediatrics, National Taiwan University Hospital, Taipei, 10002, Taiwan
| | - Daniel E Knutson
- Department of Chemistry and Biochemistry, Milwaukee Institute for Drug Discovery, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
| | - Tzu-Hsuan Lai
- Department of Pediatrics, National Taiwan University Hospital, Taipei, 10002, Taiwan
| | - Werner Sieghart
- Center for Brain Research, Department of Molecular Neurosciences, Medical University Vienna, 1090, Vienna, Austria
| | - James Cook
- Department of Chemistry and Biochemistry, Milwaukee Institute for Drug Discovery, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
| | - Lih-Chu Chiou
- Department of Pharmacology, Graduate Institute of Pharmacology College of Medicine, National Taiwan University, No. 1, Jen-Ai Rd., Section 1, Taipei, 10051, Taiwan.
- Graduate Institute of Brain and Mind Sciences College of Medicine, National Taiwan University, Taipei, 10051, Taiwan.
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, 40402, Taiwan.
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13
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Fakih D, Baudouin C, Réaux-Le Goazigo A, Mélik Parsadaniantz S. TRPM8: A Therapeutic Target for Neuroinflammatory Symptoms Induced by Severe Dry Eye Disease. Int J Mol Sci 2020; 21:E8756. [PMID: 33228217 PMCID: PMC7699525 DOI: 10.3390/ijms21228756] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/06/2020] [Accepted: 11/17/2020] [Indexed: 12/23/2022] Open
Abstract
Dry eye disease (DED) is commonly associated with ocular surface inflammation and pain. In this study, we evaluated the effectiveness of repeated instillations of transient receptor potential melastatin 8 (TRPM8) ion channel antagonist M8-B on a mouse model of severe DED induced by the excision of extra-orbital lacrimal and Harderian glands. M8-B was topically administered twice a day from day 7 until day 21 after surgery. Cold and mechanical corneal sensitivities and spontaneous ocular pain were monitored at day 21. Ongoing and cold-evoked ciliary nerve activities were next evaluated by electrophysiological multi-unit extracellular recording. Corneal inflammation and expression of genes related to neuropathic pain and inflammation were assessed in the trigeminal ganglion. We found that DED mice developed a cold allodynia consistent with higher TRPM8 mRNA expression in the trigeminal ganglion (TG). Chronic M8-B instillations markedly reversed both the corneal mechanical allodynia and spontaneous ocular pain commonly associated with persistent DED. M8-B instillations also diminished the sustained spontaneous and cold-evoked ciliary nerve activities observed in DED mice as well as inflammation in the cornea and TG. Overall, our study provides new insight into the effectiveness of TRPM8 blockade for alleviating corneal pain syndrome associated with severe DED, opening a new avenue for ocular pain management.
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Affiliation(s)
- Darine Fakih
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (D.F.); (C.B.); (A.R.-L.G.)
- R&D Department, Laboratoires Théa, 12 rue Louis Biérot, F-63000 Clermont-Ferrand, France
| | - Christophe Baudouin
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (D.F.); (C.B.); (A.R.-L.G.)
- CHNO des Quinze-Vingts, INSERM-DGOS CIC 1423, 17 rue Moreau, F-75012 Paris, France
- Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, 9 avenue Charles de Gaulle, F-92100 Boulogne-Billancourt, France
| | - Annabelle Réaux-Le Goazigo
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (D.F.); (C.B.); (A.R.-L.G.)
| | - Stéphane Mélik Parsadaniantz
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (D.F.); (C.B.); (A.R.-L.G.)
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14
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Liktor-Busa E, Blawn KT, Kellohen KL, Wiese BM, Verkhovsky V, Wahl J, Vivek A, Palomino SM, Davis TP, Vanderah TW, Largent-Milnes TM. Functional NHE1 expression is critical to blood brain barrier integrity and sumatriptan blood to brain uptake. PLoS One 2020; 15:e0227463. [PMID: 32469979 PMCID: PMC7259629 DOI: 10.1371/journal.pone.0227463] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 05/04/2020] [Indexed: 12/31/2022] Open
Abstract
Disruption of blood-brain barrier integrity and dramatic failure of brain ion homeostasis including fluctuations of pH occurs during cortical spreading depression (CSD) events associated with several neurological disorders, including migraine with aura, traumatic brain injury and stroke. NHE1 is the primary regulator of pH in the central nervous system. The goal of the current study was to investigate the role of sodium-hydrogen exchanger type 1 (NHE1) in blood brain barrier (BBB) integrity during CSD events and the contributions of this antiporter on xenobiotic uptake. Using immortalized cell lines, pharmacologic inhibition and genetic knockdown of NHE1 mitigated the paracellular uptake of radiolabeled sucrose implicating functional NHE1 in BBB maintenance. In contrast, loss of functional NHE1 in endothelial cells facilitated uptake of the anti-migraine therapeutic, sumatriptan. In female rats, cortical KCl but not aCSF selectively reduced total expression of NHE1 in cortex and PAG but increased expression in trigeminal ganglia; no changes were seen in trigeminal nucleus caudalis. Thus, in vitro observations may have a significance in vivo to increase brain sumatriptan levels. Pharmacological inhibition of NHE1 prior to cortical manipulations enhanced the efficacy of sumatriptan at early time-points but induced facial sensitivity alone. Overall, our results suggest that dysregulation of NHE1 contributes to breaches in BBB integrity, drug penetrance, and the behavioral sensitivity to the antimigraine agent, sumatriptan.
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Affiliation(s)
- Erika Liktor-Busa
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Kiera T. Blawn
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Kathryn L. Kellohen
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Beth M. Wiese
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Vani Verkhovsky
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Jared Wahl
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Anjali Vivek
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Seph M. Palomino
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Thomas P. Davis
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Todd W. Vanderah
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
| | - Tally M. Largent-Milnes
- Department of Pharmacology, University of Arizona, Tucson, Arizona, United States of America
- * E-mail:
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15
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Lee J, Ohara K, Shinoda M, Hayashi Y, Kubo A, Sugawara S, Asano S, Soma K, Kanno K, Ando M, Koyama R, Kimura Y, Sakanashi K, Iinuma T, Iwata K. Involvement of Satellite Cell Activation via Nitric Oxide Signaling in Ectopic Orofacial Hypersensitivity. Int J Mol Sci 2020; 21:ijms21041252. [PMID: 32070010 PMCID: PMC7072927 DOI: 10.3390/ijms21041252] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 02/11/2020] [Indexed: 12/03/2022] Open
Abstract
The mechanical head-withdrawal threshold (MHWT) was significantly reduced following inferior alveolar nerve transection (IANX) in rats. Nitrate and nitrite synthesis was dramatically increased in the trigeminal ganglion (TG) at 6 h after the IANX. The relative number of neuronal nitric oxide synthase (nNOS)-immunoreactive (IR) cells was significantly higher in IANX rats compared to sham-operated and N-propyl-L-arginine (NPLA)-treated IANX rats. On day 3 after NPLA administration, the MHWT recovered considerably in IANX rats. Following L-arginine injection into the TG, the MHWT was significantly reduced within 15 min, and the mean number of TG cells encircled by glial fibrillary acidic protein (GFAP)-IR cells was substantially higher. The relative number of nNOS-IR cells encircled by GFAP-IR cells was significantly increased in IANX rats. In contrast, after NPLA injection into the TG, the relative number of GFAP-IR cells was considerably reduced in IANX rats. Fluorocitrate administration into the TG significantly reduced the number of GFAP-IR cells and prevented the MHWT reduction in IANX rats. The present findings suggest that following IANX, satellite glial cells are activated via nitric oxide (NO) signaling from TG neurons. The spreading satellite glial cell activation within the TG results in mechanical hypersensitivity of face regions not directly associated with the trigeminal nerve injury.
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Affiliation(s)
- Jun Lee
- Department of Complete Denture Prosthodontics, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan;
- Correspondence: (J.L.); (K.I.); Tel.: +81-3-3219-8122 (J.L.); +81-3-3219-8122 (K.I.); Fax: +81-3-3219-8341 (J.L.); +81-3-3219-8341 (K.I.)
| | - Kinuyo Ohara
- Department of Endodontics, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (K.O.); (K.K.)
| | - Masamichi Shinoda
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
| | - Yoshinori Hayashi
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
| | - Asako Kubo
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
| | - Shiori Sugawara
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
| | - Sayaka Asano
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
- Department of Oral Diagnosis, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan
| | - Kumi Soma
- Department of Pediatric Dentistry, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan;
| | - Kohei Kanno
- Department of Endodontics, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (K.O.); (K.K.)
| | - Masatoshi Ando
- Department of Oral Surgery, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.A.); (R.K.); (Y.K.)
| | - Ryo Koyama
- Department of Oral Surgery, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.A.); (R.K.); (Y.K.)
| | - Yuki Kimura
- Department of Oral Surgery, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.A.); (R.K.); (Y.K.)
| | - Kousuke Sakanashi
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
| | - Toshimitsu Iinuma
- Department of Complete Denture Prosthodontics, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan;
| | - Koichi Iwata
- Department of Physiology, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan; (M.S.); (Y.H.); (A.K.); (S.S.); (S.A.); (K.S.)
- Correspondence: (J.L.); (K.I.); Tel.: +81-3-3219-8122 (J.L.); +81-3-3219-8122 (K.I.); Fax: +81-3-3219-8341 (J.L.); +81-3-3219-8341 (K.I.)
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16
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Vitoux MA, Kessal K, Melik Parsadaniantz S, Claret M, Guerin C, Baudouin C, Brignole-Baudouin F, Réaux-Le Goazigo A. Benzalkonium chloride-induced direct and indirect toxicity on corneal epithelial and trigeminal neuronal cells: proinflammatory and apoptotic responses in vitro. Toxicol Lett 2019; 319:74-84. [PMID: 31707104 DOI: 10.1016/j.toxlet.2019.10.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/03/2019] [Accepted: 10/18/2019] [Indexed: 11/17/2022]
Abstract
Benzalkonium chloride (BAK), a quaternary ammonium compound widely used as disinfecting agent as well as preservative in eye drops is known to induce toxic effects on the ocular surface with inflammation and corneal nerve damage leading to dry eye disease (DED) in the medium-to-long term. The aim of this study was to evaluate in vitro the toxicity of a conditioned medium produced by corneal epithelial cells previously exposed to BAK (BAK-CM) on trigeminal neuronal cells. A human corneal epithelial (HCE) cell line was exposed to 5.10-3% BAK (i.e. 0.005% BAK) for 15 min and let recover for 5 h to prepare a BAK-CM. This BAK concentration is the lowest one found in eye drops. After this recovery period, BAK effect on HCE cells displayed cytotoxicity, morphological alteration, apoptosis, oxidative stress, ATP release, CCL2 and IL6 gene induction, as well as an increase in CCL2, IL-6 and MIF release. Next, a mouse trigeminal ganglion primary culture was exposed to the BAK-CM for 2 h, 4 h or 24 h. Whereas BAK-CM did not alter neuronal cell morphology, or induced neuronal cytotoxicity or oxidative stress, BAK-CM induced gene expression of Fos (neuronal activation marker), Atf3 (neuronal injury marker), Ccl2 and Il6 (inflammatory markers). Two and 4 h BAK-CM exposure promoted a neuronal damage (ATF-3, phospho-p38 increases; phospho-Stat3 decreases) while 24 h-BAK-CM exposure initiated a prosurvival pathway activation (phospho-p44/42, phospho-Akt increases; ATF-3, GADD153, active Caspase-3 decreases). In conclusion, this in vitro model, simulating paracrine mechanisms, represents an interesting tool to highlight the indirect toxic effects of BAK or any other xenobiotic on corneal trigeminal neurons and may help to better understand the cellular mechanisms that occur during DED pathophysiology.
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Affiliation(s)
- Michael-Adrien Vitoux
- Sorbonne Université, INSERM, CNRS, IHU Foresight, Institut de la Vision, F-75012 Paris, France; HORUS PHARMA, F-06700 Saint-Laurent-du-Var, France
| | - Karima Kessal
- Sorbonne Université, INSERM, CNRS, IHU Foresight, Institut de la Vision, F-75012 Paris, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, INSERM-DGOS CIC 1423, IHU Foresight, F-75012 Paris, France
| | | | | | | | - Christophe Baudouin
- Sorbonne Université, INSERM, CNRS, IHU Foresight, Institut de la Vision, F-75012 Paris, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, INSERM-DGOS CIC 1423, IHU Foresight, F-75012 Paris, France; Université Versailles-Saint-Quentin-en-Yvelines, Hôpital Ambroise Paré, APHP, F-92100 Boulogne-Billancourt, France
| | - Françoise Brignole-Baudouin
- Sorbonne Université, INSERM, CNRS, IHU Foresight, Institut de la Vision, F-75012 Paris, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, INSERM-DGOS CIC 1423, IHU Foresight, F-75012 Paris, France; Université de Paris, Faculté de Pharmacie de Paris, F-75006 Paris, France
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17
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Chen SJ, Lee CJ, Lin TB, Peng HY, Liu HJ, Chen YS, Tseng KW. Protective Effects of Fucoxanthin on Ultraviolet B-Induced Corneal Denervation and Inflammatory Pain in a Rat Model. Mar Drugs 2019; 17:md17030152. [PMID: 30841522 PMCID: PMC6471339 DOI: 10.3390/md17030152] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 02/27/2019] [Accepted: 02/28/2019] [Indexed: 01/04/2023] Open
Abstract
Fucoxanthin is a carotenoid with many pharmaceutical properties that is found in brown seaweed. However, the effects of fucoxanthin on corneal innervation and intense eye pain have not been extensively examined. To clarify the protective roles and underlying mechanisms of fucoxanthin on ocular lesions, we investigated the beneficial effects and mechanisms by which fucoxanthin ameliorates ultraviolet B (UVB)-induced corneal denervation and trigeminal pain. Treatment with fucoxanthin enhanced the expression of nuclear factor erythroid 2-related factor 2 in the cornea. Inhibition of typical denervation and epithelial exfoliation in the cornea were observed in rats treated with fucoxanthin following UVB-induced nerve disorders. Moreover, the active phosphorylated form of p38 MAP kinase (pp38) and the number of glial fibrillary acidic protein (GFAP)-positive neural cells were significantly reduced. Decreased expression of neuron-selective transient receptor potential vanilloid type 1 (TRPV1) in the trigeminal ganglia neurons was also demonstrated in rats treated with fucoxanthin after UVB-induced keratitis. Symptoms of inflammatory pain, including difficulty in opening the eyes and eye wipe behaviour, were also reduced in fucoxanthin-treated groups. Pre-treatment with fucoxanthin may protect the eyes from denervation and inhibit trigeminal pain in UVB-induced photokeratitis models.
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Affiliation(s)
- Shiu-Jau Chen
- Department of Neurosurgery, Mackay Memorial Hospital, Taipei 10449, Taiwan.
- Department of Medicine, Mackay Medical College, New Taipei 25245, Taiwan.
| | - Ching-Ju Lee
- Internal Medicine, Taipei Hospital, Ministry of Health and Welfare, New Taipei 24213, Taiwan.
- Department of Business Administration, National Taipei University, New Taipei 24741, Taiwan.
| | - Tzer-Bin Lin
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11049, Taiwan.
| | - Hsien-Yu Peng
- Department of Medicine, Mackay Medical College, New Taipei 25245, Taiwan.
| | - Hsiang-Jui Liu
- Department of Optometry, Mackay Junior College of Medicine, Nursing and Management, New Taipei 11260, Taiwan.
| | - Yu-Shan Chen
- Department of Business Administration, National Taipei University, New Taipei 24741, Taiwan.
| | - Kuang-Wen Tseng
- Department of Medicine, Mackay Medical College, New Taipei 25245, Taiwan.
- School of Life Science, National Taiwan Normal University, Taipei 10610, Taiwan.
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18
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Zhang L, Kunkler PE, Knopp KL, Oxford GS, Hurley JH. Role of intraganglionic transmission in the trigeminovascular pathway. Mol Pain 2019; 15:1744806919836570. [PMID: 30784351 PMCID: PMC6440047 DOI: 10.1177/1744806919836570] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 01/29/2019] [Accepted: 01/29/2019] [Indexed: 01/14/2023] Open
Abstract
Migraine is triggered by poor air quality and odors through unknown mechanisms. Activation of the trigeminovascular pathway by environmental irritants may occur via activation of transient receptor potential ankyrin 1 (TRPA1) receptors on nasal trigeminal neurons, but how that results in peripheral and central sensitization is unclear. The anatomy of the trigeminal ganglion suggests that noxious nasal stimuli are not being transduced to the meninges by axon reflex but likely through intraganglionic transmission. Consistent with this concept, we injected calcitonin gene-related peptide, adenosine triphosphate, or glutamate receptor antagonists or a gap junction channel blocker directly and exclusively into the trigeminal ganglion and blocked meningeal blood flow changes in response to acute nasal TRP agonists. Previously, we observed chronic sensitization of the trigeminovascular pathway after acrolein exposure, a known TRPA1 receptor agonist. To explore the mechanism of this sensitization, we utilized laser dissection microscopy to separately harvest nasal and meningeal trigeminal neuron populations in the absence or presence of acrolein exposure. mRNA levels of neurotransmitters important in migraine were then determined by reverse transcription polymerase chain reaction. TRPA1 message levels were significantly increased in meningeal cell populations following acrolein exposure compared to room air exposure. This was specific to TRPA1 message in meningeal cell populations as changes were not observed in either nasal trigeminal cell populations or dorsal root ganglion populations. Taken together, these data suggest an important role for intraganglionic transmission in acute activation of the trigeminovascular pathway. It also supports a role for upregulation of TRPA1 receptors in peripheral sensitization and a possible mechanism for chronification of migraine after environmental irritant exposure.
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Affiliation(s)
- LuJuan Zhang
- The Department of Biochemistry and Molecular Biology, Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Phillip Edward Kunkler
- The Department of Biochemistry and Molecular Biology, Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Kelly L Knopp
- Lilly Research Laboratories, Eli Lilly & Company, Indianapolis, IN, USA
| | - Gerry Stephen Oxford
- Department of Pharmacology and Toxicology, Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Joyce Harts Hurley
- Department of Medical and Molecular Genetics, Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, IN, USA
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19
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Deák É, Rosta J, Boros K, Kis G, Sántha P, Messlinger K, Jancsó G, Dux M. Chronic adriamycin treatment impairs CGRP-mediated functions of meningeal sensory nerves. Neuropeptides 2018; 69:46-52. [PMID: 29661478 DOI: 10.1016/j.npep.2018.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 02/05/2018] [Accepted: 04/09/2018] [Indexed: 01/31/2023]
Abstract
Adriamycin is a potent anthracycline-type antitumor agent, but it also exerts potentially serious side effects due to its cardiotoxic and neurotoxic propensity. Multiple impairments in sensory nerve functions have been recently reported in various rat models. The present experiments were initiated in an attempt to reveal adriamycin-induced changes in sensory effector functions of chemosensitive meningeal afferents. Meningeal blood flow was measured with laser Doppler flowmetry in the parietal dura mater of adult male Wistar rats. The dura mater was repeatedly stimulated by topical applications of capsaicin, a transient receptor potential vanilloid 1 (TRPV1) receptor agonist, or acrolein, a transient receptor potential ankyrin 1 (TRPA1) receptor agonist, which induce the release of calcitonin gene-related peptide (CGRP) from meningeal afferents. The blood flow increasing effects of CGRP, histamine, acetylcholine and forskolin were also measured. Capsaicin- and acrolein-induced CGRP release was measured with enzyme-linked immunoassay in an ex vivo dura mater preparation. TRPV1 content of trigeminal ganglia and TRPV1-, CGRP- and CGRP receptor component-immunoreactive structures were examined in dura mater samples obtained from control and adriamycin-treated rats. The vasodilator effects of capsaicin, acrolein and CGRP were significantly reduced in adriamycin-treated animals while histamine-, acetylcholine- and forskolin-induced vasodilatation were unaffected. Measurements of CGRP release in an ex vivo dura mater preparation revealed an altered dynamic upon repeated stimulations of TRPV1 and TRPA1 receptors. In whole-mount dura mater preparations immunohistochemistry revealed altered CGRP receptor component protein (RCP)-immunoreactivity in adriamycin-treated animals, while CGRP receptor activity modifying protein (RAMP1)-, TRPV1- and CGRP-immunostaining were left apparently unaltered. Adriamycin-treatment slightly reduced TRPV1 protein content of trigeminal ganglia. The present findings demonstrate that adriamycin-treatment alters the function of the trigeminovascular system leading to reduced meningeal sensory neurogenic vasodilatation that may affect the local regulatory and protective mechanisms of chemosensitive afferents leading to alterations in tissue integrity.
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Affiliation(s)
- Éva Deák
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
| | - Judit Rosta
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
| | - Krisztina Boros
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
| | - Gyöngyi Kis
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
| | - Péter Sántha
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
| | - Karl Messlinger
- Institute of Physiology and Pathophysiology, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstrasse 17, D-91054 Erlangen, Germany
| | - Gábor Jancsó
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
| | - Mária Dux
- Department of Physiology, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary.
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20
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Ramachandran R, Pedersen SH, Amrutkar DV, Petersen S, Jacobsen JM, Hay-Schmidt A, Olesen J, Jansen-Olesen I. Selective cephalic upregulation of p-ERK, CamKII and p-CREB in response to glyceryl trinitrate infusion. Cephalalgia 2018; 38:1057-1070. [PMID: 28738691 DOI: 10.1177/0333102417722511] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background A common characteristic of migraine-inducing substances is that they cause headache and no pain in other areas of the body. Few studies have compared pain mechanisms in the trigeminal and spinal systems and, so far, no major differences have been noted. We compared signalling molecules in the trigeminal and spinothalamic system after infusion of the migraine-provoking substance glyceryltrinitrate. Method A catheter was placed in the femoral vein of rats and one week later glyceryltrinitrate 4 µg/kg/min was infused for 20 min. Protein expression in the dura mater, trigeminal ganglion, nucleus caudalis, dorsal root ganglion and the dorsal horn of the thoracic spinal cord was analysed at different time points using western blotting and immunohistochemistry. Results Glyceryltrinitrate caused a threefold increase in expression of phosphorylated extracellular signal-regulated kinases at 30 min in the dura mater and nucleus caudalis ( P < 0.05) and at 2 h in the trigeminal ganglion with very few expressions in the dorsal root ganglion. In the nucleus caudalis, expression of phosphorylated extracellular signal-regulated kinases and Cam KII increased 2.6-fold and 3.2-fold, respectively, at 2 h after glycerytrinitrate infusion ( P < 0.01). p-CREB/ATF-1 upregulation was observed only at 30 min ( P < 0.05) in the nucleus caudalis. None of these markers showed increased expression in the regions of thoracic spinal cord dorsal horn. Conclusion The dura, trigeminal ganglion and nucleus caudalis are activated shortly after glycerytrinitrate infusion with long-lasting expression of phosphorylated extracellular signal-regulated kinases observed in the nucleus caudalis. These activations were not observed at the spinal level.
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Affiliation(s)
- Roshni Ramachandran
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
| | - Sara Hougaard Pedersen
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
| | - Dipak Vasantrao Amrutkar
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
| | - Steffen Petersen
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
| | - Julie Mie Jacobsen
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
| | - Anders Hay-Schmidt
- 2 Department of Neuroscience and Pharmacology, Faculty of Health and Medical Sciences, Panum Institute, Copenhagen, Denmark
| | - Jes Olesen
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
| | - Inger Jansen-Olesen
- 1 Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
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21
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Zhang Y, Ji H, Wang J, Sun Y, Qian Z, Jiang X, Snutch TP, Sun Y, Tao J. Melatonin-mediated inhibition of Cav3.2 T-type Ca 2+ channels induces sensory neuronal hypoexcitability through the novel protein kinase C-eta isoform. J Pineal Res 2018; 64:e12476. [PMID: 29437250 DOI: 10.1111/jpi.12476] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 02/04/2018] [Indexed: 12/29/2022]
Abstract
Recent studies implicate melatonin in the antinociceptive activity of sensory neurons. However, the underlying mechanisms are still largely unknown. Here, we identify a critical role of melatonin in functionally regulating Cav3.2 T-type Ca2+ channels (T-type channel) in trigeminal ganglion (TG) neurons. Melatonin inhibited T-type channels in small TG neurons via the melatonin receptor 2 (MT2 receptor) and a pertussis toxin-sensitive G-protein pathway. Immunoprecipitation analyses revealed that the intracellular subunit of the MT2 receptor coprecipitated with Gαo . Both shRNA-mediated knockdown of Gαo and intracellular application of QEHA peptide abolished the inhibitory effects of melatonin. Protein kinase C (PKC) antagonists abolished the melatonin-induced T-type channel response, whereas inhibition of conventional PKC isoforms elicited no effect. Furthermore, application of melatonin increased membrane abundance of PKC-eta (PKCη ) while antagonism of PKCη or shRNA targeting PKCη prevented the melatonin-mediated effects. In a heterologous expression system, activation of MT2 receptor strongly inhibited Cav3.2 T-type channel currents but had no effect on Cav3.1 and Cav3.3 current amplitudes. The selective Cav3.2 response was PKCη dependent and was accompanied by a negative shift in the steady-state inactivation curve. Furthermore, melatonin decreased the action potential firing rate of small TG neurons and attenuated the mechanical hypersensitivity in a mouse model of complete Freund's adjuvant-induced inflammatory pain. These actions were inhibited by T-type channel blockade. Together, our results demonstrated that melatonin inhibits Cav3.2 T-type channel activity through the MT2 receptor coupled to novel Gβγ -mediated PKCη signaling, subsequently decreasing the membrane excitability of TG neurons and pain hypersensitivity in mice.
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Affiliation(s)
- Yuan Zhang
- Department of Physiology and Neurobiology & Centre for Ion Channelopathy, Medical College of Soochow University, Suzhou, China
- Department of Geriatrics & Institute of Neuroscience, the Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Heyi Ji
- Department of Physiology and Neurobiology & Centre for Ion Channelopathy, Medical College of Soochow University, Suzhou, China
| | - Jiangong Wang
- Department of Physiology and Neurobiology & Centre for Ion Channelopathy, Medical College of Soochow University, Suzhou, China
| | - Yufang Sun
- Department of Physiology and Neurobiology & Centre for Ion Channelopathy, Medical College of Soochow University, Suzhou, China
| | - Zhiyuan Qian
- Department of Geriatrics & Institute of Neuroscience, the Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Xinghong Jiang
- Department of Physiology and Neurobiology & Centre for Ion Channelopathy, Medical College of Soochow University, Suzhou, China
| | - Terrance P Snutch
- Michael Smith Laboratories and Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Yangang Sun
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Jin Tao
- Department of Physiology and Neurobiology & Centre for Ion Channelopathy, Medical College of Soochow University, Suzhou, China
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22
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Chatchaisak D, Connor M, Srikiatkhachorn A, Chetsawang B. The potentiating effect of calcitonin gene-related peptide on transient receptor potential vanilloid-1 activity and the electrophysiological responses of rat trigeminal neurons to nociceptive stimuli. J Physiol Sci 2018; 68:261-268. [PMID: 28205139 PMCID: PMC10717096 DOI: 10.1007/s12576-017-0529-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Accepted: 02/05/2017] [Indexed: 10/20/2022]
Abstract
Growing evidence suggests that calcitonin gene-related peptide (CGRP) participates in trigeminal nociceptive responses. However, the role of CGRP in sensitization or desensitization of nociceptive transduction remains poorly understood. In this study, we sought to further investigate the CGRP-induced up-regulation of transient receptor potential vanilloid-1 (TRPV1) and the responses of trigeminal neurons to nociceptive stimuli. Rat trigeminal ganglion (TG) organ cultures and isolated trigeminal neurons were incubated with CGRP. An increase in TRPV1 levels was observed in CGRP-incubated TG organ cultures. CGRP potentiated capsaicin-induced increase in phosphorylated CaMKII levels in the TG organ cultures. The incubation of the trigeminal neurons with CGRP significantly increased the inward currents in response to capsaicin challenge, and this effect was inhibited by co-incubation with the CGRP receptor antagonist, BIBN4068BS or the inhibitor of protein kinase A, H-89. These findings reveal that CGRP acting on trigeminal neurons may play a significant role in facilitating cellular events that contribute to the peripheral sensitization of the TG in nociceptive transmission.
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Affiliation(s)
- Duangthip Chatchaisak
- Research Center for Neuroscience, Institute of Molecular Biosciences, Mahidol University, Salaya, Nakhonpathom, 73170, Thailand
| | - Mark Connor
- Australian School of Advanced Medicine, Macquarie University, Sydney, Australia
| | - Anan Srikiatkhachorn
- International Medical College, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand
| | - Banthit Chetsawang
- Research Center for Neuroscience, Institute of Molecular Biosciences, Mahidol University, Salaya, Nakhonpathom, 73170, Thailand.
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23
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Jacobs BA, Pando MM, Jennings E, Chavera TA, Clarke WP, Berg KA. Allosterism within δ Opioid- κ Opioid Receptor Heteromers in Peripheral Sensory Neurons: Regulation of κ Opioid Agonist Efficacy. Mol Pharmacol 2018; 93:376-386. [PMID: 29436492 PMCID: PMC5832326 DOI: 10.1124/mol.117.109975] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 02/01/2018] [Indexed: 11/22/2022] Open
Abstract
There is abundant evidence for formation of G protein-coupled receptor heteromers in heterologous expression systems, but little is known of the function of heteromers in native systems. Heteromers of δ and κ opioid receptors (DOR-KOR heteromers) have been identified in native systems. We previously reported that activation of DOR-KOR heteromers expressed by rat pain-sensing neurons (nociceptors) produces robust, peripherally mediated antinociception. Moreover, DOR agonist potency and efficacy is regulated by KOR antagonists via allosteric interactions within the DOR-KOR heteromer in a ligand-dependent manner. Here we assessed the reciprocal regulation of KOR agonist function by DOR antagonists in adult rat nociceptors in culture and in a behavioral assay of nociception. Naltrindole enhanced the potency of the KOR agonist 2-(3,4-dichlorophenyl)-N-methyl-N-[(1S)-1-phenyl-2-pyrrolidin-1-ylethyl]acetamide (ICI-199441) 10- to 20-fold, but did not alter responses to 2-(3,4-dichlorophenyl)-N-methyl-N-[(1R,2R)-2-pyrrolidin-1-ylcyclohexyl]acetamide (U50488). By contrast, the potency of U50488 was enhanced 20-fold by 7-benzylidenenaltrexone. The efficacy of 6'-guanidinonaltrindole (6'-GNTI) to inhibit nociceptors was blocked by small interfering RNA knockdown of DOR or KOR. Replacing 6'-GNTI occupancy of DOR with either naltrindole or 7-benzylidenenaltrexone abolished 6'-GNTI efficacy. Further, peptides derived from DOR transmembrane segment 1 fused to the cell membrane-penetrating HIV transactivator of transcription peptide also blocked 6'-GNTI-mediated responses ex vivo and in vivo, suggesting that 6'-GNTI efficacy in nociceptors is due to its positive allosteric regulation of KOR via occupancy of DOR in a DOR-KOR heteromer. Together, these results provide evidence for the existence of functional DOR-KOR heteromers in rat peripheral sensory neurons and that reciprocal, ligand-dependent allosteric interactions occur between the DOR and KOR protomers.
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MESH Headings
- Allosteric Regulation/drug effects
- Allosteric Regulation/physiology
- Amino Acid Sequence
- Analgesics, Opioid/pharmacology
- Animals
- Cells, Cultured
- Dose-Response Relationship, Drug
- Male
- Peptide Fragments/genetics
- Peptide Fragments/pharmacology
- Peripheral Nerves/drug effects
- Peripheral Nerves/physiology
- Rats
- Rats, Sprague-Dawley
- Receptors, Opioid, delta/agonists
- Receptors, Opioid, delta/physiology
- Receptors, Opioid, kappa/agonists
- Receptors, Opioid, kappa/physiology
- Sensory Receptor Cells/drug effects
- Sensory Receptor Cells/physiology
- Trigeminal Ganglion/drug effects
- Trigeminal Ganglion/physiology
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Affiliation(s)
- Blaine A Jacobs
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Miryam M Pando
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Elaine Jennings
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Teresa A Chavera
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - William P Clarke
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Kelly A Berg
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
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24
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Abstract
The firing properties of small neurons (with diameters of soma less than 25 µm) were investigated using patch-clamp technique in whole-cell configuration in primary culture of trigeminal ganglia (TG) of postnatal rats. TG neurons were divided into three groups according to their firing responses to long-lasting depolarizing pulses: adaptive neurons (AN) characterized by a strongly adaptive responses; tonic neurons (TN) characterized by a multiple tonic firing; neurons with a delay before initiation of AP generation, namely, NDG. AN, TN and NDG also differed in AP electrophysiological and pharmacological characteristics. TN was distinguished by responses to hyperpolarization and the greatest value of input resistance. TN, AN and NDG were characterized by different active properties (amplitude of action potential and afterhyperpolarization, reobase, threshold). Each group of neurons was characterized by heterogeneity of AP duration and of frequency properties for TN. The application of tetrodotoxin (TTX) (250 nM) resulted in full or partial inhibition of AP generation and some neurons had TTX – insensitive firing responses. Neurons that were not affected by TTX had markedly longer AP. TTX had no effect on electrical activity of some AN and NDG. Based on sensitivity to TTX and their electrophysiological properties, AN and NDG seem to be C-fiber nococeptors.
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Chaves HV, do Val DR, Ribeiro KA, Lemos JC, Souza RB, Gomes FIF, da Cunha RMS, de Paulo Teixeira Pinto V, Filho GC, de Souza MHLP, Bezerra MM, de Castro Brito GA. Heme oxygenase-1/biliverdin/carbon monoxide pathway downregulates hypernociception in rats by a mechanism dependent on cGMP/ATP-sensitive K + channels. Inflamm Res 2018; 67:407-422. [PMID: 29362850 DOI: 10.1007/s00011-018-1133-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 12/14/2017] [Accepted: 01/17/2018] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE AND DESIGN To investigate the role of heme oxygenase-1 (HO-1), carbon monoxide (CO), and biliverdin (BVD) in the zymosan-induced TMJ arthritis in rats. MATERIALS AND METHODS Mechanical threshold was assessed before and 4 h after TMJ arthritis induction in rats. Cell influx, myeloperoxidase activity, and histological changes were measured in the TMJ lavages and tissues. Trigeminal ganglion and periarticular tissues were used for HO-1, TNF-α, and IL-1β mRNA time course expression and immunohistochemical analyses. Hemin (0.1, 0.3, or 1 mg kg-1), DMDC (0.025, 0.25, or 2.5 µmol kg-1), biliverdin (1, 3, or 10 mg kg-1), or ZnPP-IX (1, 3 or 9 mg kg-1) were injected (s.c.) 60 min before zymosan. ODQ (12.5 µmol kg-1; s.c.) or glibenclamide (10 mg kg-1; i.p.) was administered 1 h and 30 min prior to DMDC (2.5 µmol kg-1; s.c), respectively. RESULTS Hemin (1 mg kg-1), DMDC (2.5 µmol kg-1), and BVD (10 mg kg-1) reduced hypernociception and leukocyte migration, which ZnPP (3 mg kg-1) enhanced. The effects of DMDC were counteracted by ODQ and glibenclamide. The HO-1, TNF-α, and IL-1β mRNA expression and immunolabelling increased. CONCLUSIONS HO-1/BVD/CO pathway activation provides anti-nociceptive and anti-inflammatory effects on the zymosan-induced TMJ hypernociception in rats.
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Affiliation(s)
- Hellíada Vasconcelos Chaves
- Faculty of Dentistry of Sobral, Federal University of Ceará, Avenida Comandante Maurocélio Rocha Pontes, 100, Derby, Sobral, CEP: 62.042-280, Brazil.
| | - Danielle Rocha do Val
- Federal University of Pernambuco, North Eastern Biotechnology Network, Recife, Brazil
| | - Kátia Alves Ribeiro
- Master of Biotechnology Degree Programme, Federal University of Ceará, Sobral, Brazil
| | | | - Ricardo Basto Souza
- Master of Biotechnology Degree Programme, Federal University of Ceará, Sobral, Brazil
| | - Francisco Isaac Fernandes Gomes
- Faculty of Dentistry of Sobral, Federal University of Ceará, Avenida Comandante Maurocélio Rocha Pontes, 100, Derby, Sobral, CEP: 62.042-280, Brazil
| | | | | | | | | | | | - Gerly Anne de Castro Brito
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
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Shoji I, Kemuriyama T, Tandai-Hiruma M, Maruyama S, Tashiro A, Yokoe H, Nishida Y. Reflex arc of the teeth clenching-induced pressor response in rats. J Physiol Sci 2018; 68:89-100. [PMID: 28035645 PMCID: PMC10717518 DOI: 10.1007/s12576-016-0513-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 12/07/2016] [Indexed: 12/19/2022]
Abstract
Although "teeth clenching" induces pressor response, the reflex tracts of the response are unknown. In this study, dantrolene administration inhibited teeth clenching generated by electrical stimulation of the masseter muscles and completely abolished the pressor response. In addition, trigeminal ganglion block or hexamethonium administration completely abolished the pressor response. Local anesthesia of molar regions significantly reduced the pressor response to 27 ± 10%. Gadolinium (mechanoreceptor blocker of group III muscle afferents) entrapment in masticatory muscles also significantly reduced the pressor response to 62 ± 7%. Although atropine methyl nitrate administration did not change the pressor response, a significant dose-dependent augmentation of heart rate was observed. These results indicate that both periodontal membrane and mechanoreceptors in masticatory muscles are the receptors for the pressor response, and that the afferent and efferent pathways of the pressor response pass through the trigeminal afferent nerves and sympathetic nerves, respectively.
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Affiliation(s)
- Ichiro Shoji
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan.
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, Tokorozawa, Saitama, Japan.
| | - Takehito Kemuriyama
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
| | - Megumi Tandai-Hiruma
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
| | - Satoshi Maruyama
- Pharmacochemical Section, Aeromedical Laboratory, Japan Air Self Defense Force, Tachikawa, Tokyo, Japan
| | - Akimasa Tashiro
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
| | - Hidetaka Yokoe
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, Tokorozawa, Saitama, Japan
| | - Yasuhiro Nishida
- Department of Physiology, National Defense Medical College, Namiki 3-2, Tokorozawa, Saitama, 3598513, Japan
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Bai X, Zhang X, Zhou Q. Effect of Testosterone on TRPV1 Expression in a Model of Orofacial Myositis Pain in the Rat. J Mol Neurosci 2017; 64:93-101. [PMID: 29209900 DOI: 10.1007/s12031-017-1009-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 11/28/2017] [Indexed: 12/21/2022]
Abstract
Recent clinical studies have revealed sex differences in response to transient receptor potential vanilloid 1 (TRPV1) agonist-induced pain. However, the mechanism of these differences in TRPV1-related chronic pain remains unclear. In the present study, we investigate the effects of inflammation and gonadal hormones on TRPV1 expression in trigeminal ganglia. Inflammatory pain was modeled by injecting complete Freund's adjuvant (CFA) into the left masseter muscle in rats. TRPV1 mRNA and protein levels in the trigeminal ganglia of male and female rats following CFA injection were assessed. CFA-induced changes in TRPV1 mRNA and protein expression in the trigeminal ganglia from orchidectomized (ODX) male rats and testosterone-replaced ODX rats were examined. Additionally, TRPV1 mRNA levels in the trigeminal ganglia from ovariectomized (OVX) female and ODX male rats treated with tamoxifen were assessed. We found that the levels of TRPV1 mRNA and protein in the trigeminal ganglia from female rats following CFA injection were significantly higher than in the ganglia from naïve female rats. CFA-induced inflammatory hyperalgesia did not alter TRPV1 expression in the trigeminal ganglia from male rats. The TRPV1 mRNA and protein expression levels in the ODX male trigeminal ganglia were significantly upregulated on day 3 following the initiation of inflammation. However, CFA-induced inflammatory pain had no significant effect on TRPV1 mRNA or protein expression in testosterone-replaced ODX rats. Furthermore, tamoxifen was unable to inhibit the upregulation of TRPV1 expression in OVX female and ODX male rats after CFA injection. In summary, these data indicate that gender differences in TRPV1 function may be, in part, mediated by sex-dependent TRPV1 expression in sensory ganglia. Testosterone plays a key role in the inhibition of TRPV1 expression in this rat chronic inflammatory pain model.
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Affiliation(s)
- Xiaofeng Bai
- Department of Oral and Maxillofacial Surgery, School & Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, People's Republic of China
| | - Xia Zhang
- Department of Anesthesiology, School & Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, People's Republic of China.
| | - Qing Zhou
- Department of Oral and Maxillofacial Surgery, School & Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, People's Republic of China
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Dux M, Will C, Eberhardt M, Fischer MJM, Messlinger K. Stimulation of rat cranial dura mater with potassium chloride causes CGRP release into the cerebrospinal fluid and increases medullary blood flow. Neuropeptides 2017; 64:61-68. [PMID: 28202186 DOI: 10.1016/j.npep.2017.02.080] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/30/2016] [Accepted: 02/08/2017] [Indexed: 01/28/2023]
Abstract
Primary headaches may be accompanied by increased intracranial blood flow induced by the release of the potent vasodilator calcitonin gene-related peptide (CGRP) from activated meningeal afferents. We aimed to record meningeal and medullary blood flow simultaneously and to localize the sites of CGRP release in rodent preparations in vivo and ex vivo. Blood flow in the exposed rat parietal dura mater and the medulla oblongata was recorded by laser Doppler flowmetry, while the dura was stimulated by topical application of 60mM potassium chloride (KCl). Samples of jugular venous plasma and cerebrospinal fluid (CSF) collected from the cisterna magna were analysed for CGRP concentrations using an enzyme immunoassay. In a hemisected rat skull preparation lined with dura mater the CGRP releasing effect of KCl superfusion was examined. Superfusion of the dura mater with KCl decreased meningeal blood flow unless alpha-adrenoceptors were blocked by phentolamine, whereas the medullary blood flow was increased. The same treatment caused increased CGRP concentrations in jugular plasma and CSF and induced significant CGRP release in the hemisected rat skull preparation. Anaesthesia of the trigeminal ganglion by injection of lidocaine reduced increases in medullary blood flow and CGRP concentration in the CSF upon meningeal KCl application. CGRP release evoked by depolarisation of meningeal afferents is accompanied by increased blood flow in the medulla oblongata but not the dura mater. This discrepancy can be explained by the smooth muscle depolarising effect of KCl and the activation of sympathetic vasoconstrictor mechanisms. The medullary blood flow response is most likely mediated by CGRP released from activated central terminals of trigeminal afferents. Increased blood supply of the medulla oblongata and CGRP release into the CSF may also occur in headaches accompanying vigorous activation of meningeal afferents.
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Affiliation(s)
- Mária Dux
- Department of Physiology, University of Szeged. Dóm tér 10, H-6720 Szeged, Hungary
| | - Christine Will
- Institute of Physiology and Pathophysiology, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstrasse 17, D-91054 Erlangen, Germany
| | - Mirjam Eberhardt
- Department of Anaesthesia and Critical Care Medicine, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Michael J M Fischer
- Institute of Physiology and Pathophysiology, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstrasse 17, D-91054 Erlangen, Germany
| | - Karl Messlinger
- Institute of Physiology and Pathophysiology, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstrasse 17, D-91054 Erlangen, Germany.
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Bi RY, Meng Z, Zhang P, Wang XD, Ding Y, Gan YH. Estradiol upregulates voltage-gated sodium channel 1.7 in trigeminal ganglion contributing to hyperalgesia of inflamed TMJ. PLoS One 2017; 12:e0178589. [PMID: 28582470 PMCID: PMC5459440 DOI: 10.1371/journal.pone.0178589] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 05/15/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Temporomandibular disorders (TMDs) have the highest prevalence in women of reproductive age. The role of estrogen in TMDs and especially in TMDs related pain is not fully elucidated. Voltage-gated sodium channel 1.7 (Nav1.7) plays a prominent role in pain perception and Nav1.7 in trigeminal ganglion (TG) is involved in the hyperalgesia of inflamed Temporomandibular joint (TMJ). Whether estrogen could upregulate trigeminal ganglionic Nav1.7 expression to enhance hyperalgesia of inflamed TMJ remains to be explored. METHODS Estrous cycle and plasma levels of 17β-estradiol in female rats were evaluated with vaginal smear and enzyme linked immunosorbent assay, respectively. Female rats were ovariectomized and treated with 17β-estradiol at 0 μg, 20 μg and 80 μg, respectively, for 10 days. TMJ inflammation was induced using complete Freund's adjuvant. Head withdrawal thresholds and food intake were measured to evaluate the TMJ nociceptive responses. The expression of Nav1.7 in TG was examined using real-time PCR and western blot. The activity of Nav1.7 promoter was examined using luciferase reporter assay. The locations of estrogen receptors (ERα and ERβ), the G protein coupled estrogen receptor (GPR30), and Nav1.7 in TG were examined using immunohistofluorescence. RESULTS Upregulation of Nav1.7 in TG and decrease in head withdrawal threshold were observed with the highest plasma 17β-estradiol in the proestrus of female rats. Ovariectomized rats treated with 80 μg 17β-estradiol showed upregulation of Nav1.7 in TG and decrease in head withdrawal threshold as compared with that of the control or ovariectomized rats treated with 0 μg or 20 μg. Moreover, 17β-estradiol dose-dependently potentiated TMJ inflammation-induced upregulation of Nav1.7 in TG and also enhanced TMJ inflammation-induced decrease of head withdrawal threshold in ovariectomized rats. In addition, the estrogen receptor antagonist, ICI 182,780, partially blocked the 17β-estradiol effect on Nav1.7 expression and head withdrawal threshold in ovariectomized rats. ERα and ERβ, but not GPR30, were mostly co-localized with Nav1.7 in neurons in TG. In the nerve growth factor-induced and ERα-transfected PC12 cells, 17β-estradiol dose-dependently enhanced Nav1.7 promoter activity, whereas mutations of the estrogen response element at -1269/-1282 and -1214/-1227 in the promoter completely abolished its effect on the promoter activity. CONCLUSION Estradiol could upregulate trigeminal ganglionic Nav1.7 expression to contribute to hyperalgesia of inflamed TMJ.
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Affiliation(s)
- Rui-Yun Bi
- The Third Dental Center, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Zhen Meng
- Central laboratory, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Peng Zhang
- Central laboratory, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- Center for Temporomandibular Disorders & Orofacial Pain, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Xue-Dong Wang
- The Department of Orthodontics, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Yun Ding
- The Third Dental Center, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- * E-mail: (YD); (YHG)
| | - Ye-Hua Gan
- Central laboratory, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- Center for Temporomandibular Disorders & Orofacial Pain, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- * E-mail: (YD); (YHG)
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30
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Feldman-Goriachnik R, Hanani M. The effects of endothelin-1 on satellite glial cells in peripheral ganglia. Neuropeptides 2017; 63:37-42. [PMID: 28342550 DOI: 10.1016/j.npep.2017.03.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 03/01/2017] [Accepted: 03/16/2017] [Indexed: 11/21/2022]
Abstract
Endothelins (ET) are a family of highly active neuropeptides with manifold influences via ET receptors (ETR) in both the peripheral and central nervous systems. We have shown previously that satellite glial cells (SGCs) in mouse trigeminal ganglia (TG) are extremely sensitive to ET-1 in evoking [Ca2+]in increase, apparently via ETBR activation, but there is no functional information on ETR in SGCs of other peripheral ganglia. Here we tested the effects of ET-1 on SGCs in nodose ganglia (NG), which is sensory, and superior cervical ganglia (Sup-CG), which is part of the sympathetic nervous system, and further investigated the influence of ET-1 on SGCs in TG. Using calcium imaging we found that SGCs in intact, freshly isolated NG and Sup-CG are highly sensitive to ET-1, with threshold concentration at 0.1nM. Our results showed that [Ca2+]in elevation in response to ET-1 was partially due to Ca2+ influx from the extracellular space and partially to Ca2+ release from intracellular stores. Using receptor selective ETR agonists and antagonists, we found that the responses were mediated by mixed ETAR/ETBR in SGCs of NG and predominantly by ETBR in SGCs of Sup-CG. By employing intracellular dye injection we examined coupling among SGCs around different neurons in the presence of 5nM ET-1 and observed coupling inhibition in all the three ganglion types. In summary, our work showed that SGCs in mouse sensory and sympathetic ganglia are highly sensitive to ET-1 and that this peptide markedly reduces SGCs coupling. We conclude that ET-1, which may participate in neuron-glia communications, has similar functions in wide range of peripheral ganglia.
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Affiliation(s)
- Rachel Feldman-Goriachnik
- Laboratory of Experimental Surgery, Hadassah-Hebrew University Medical Center, Mount Scopus, Jerusalem 91240, Israel
| | - Menachem Hanani
- Laboratory of Experimental Surgery, Hadassah-Hebrew University Medical Center, Mount Scopus, Jerusalem 91240, Israel.
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Dal Ben D, Marchenkova A, Thomas A, Lambertucci C, Spinaci A, Marucci G, Nistri A, Volpini R. 2',3'-O-Substituted ATP derivatives as potent antagonists of purinergic P2X3 receptors and potential analgesic agents. Purinergic Signal 2017; 13:61-74. [PMID: 27757785 PMCID: PMC5334199 DOI: 10.1007/s11302-016-9539-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 09/19/2016] [Indexed: 11/29/2022] Open
Abstract
Blocking membrane currents evoked by the activation of purinergic P2X3 receptors localized on nociceptive neurons represents a promising strategy for the development of agents useful for the treatment of chronic pain conditions. Among compounds endowed with such antagonistic action, 2',3'-O-(2,4,6-trinitrophenyl)-ATP (TNP-ATP) is an ATP analogue, whose inhibitory activity on P2X receptors has been previously reported. Based on the results of molecular modelling studies performed with homology models of the P2X3 receptor, novel adenosine nucleotide analogues bearing cycloalkyl or arylalkyl substituents replacing the trinitrophenyl moiety of TNP-ATP were designed and synthesized. These new compounds were functionally evaluated on native P2X3 receptors from mouse trigeminal ganglion (TG) sensory neurons using patch clamp recordings under voltage clamp configuration. Our data show that some of these molecules are potent (nanomolar range) and reversible inhibitors of P2X3 receptors, without any apparent effect on trigeminal GABAA and 5-HT3 receptors, whose membrane currents were unaffected by the tested compounds.
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Affiliation(s)
- Diego Dal Ben
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, via S. Agostino 1, 62032, Camerino, (MC), Italy
| | - Anna Marchenkova
- Neuroscience Department, International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy
| | - Ajiroghene Thomas
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, via S. Agostino 1, 62032, Camerino, (MC), Italy
| | - Catia Lambertucci
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, via S. Agostino 1, 62032, Camerino, (MC), Italy
| | - Andrea Spinaci
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, via S. Agostino 1, 62032, Camerino, (MC), Italy
| | - Gabriella Marucci
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, via S. Agostino 1, 62032, Camerino, (MC), Italy
| | - Andrea Nistri
- Neuroscience Department, International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy
| | - Rosaria Volpini
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, via S. Agostino 1, 62032, Camerino, (MC), Italy.
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32
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Asiedu MN, Han C, Dib-Hajj SD, Waxman SG, Price TJ, Dussor G. The AMPK Activator A769662 Blocks Voltage-Gated Sodium Channels: Discovery of a Novel Pharmacophore with Potential Utility for Analgesic Development. PLoS One 2017; 12:e0169882. [PMID: 28118359 PMCID: PMC5261566 DOI: 10.1371/journal.pone.0169882] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 12/23/2016] [Indexed: 12/12/2022] Open
Abstract
Voltage-gated sodium channels (VGSC) regulate neuronal excitability by governing action potential (AP) generation and propagation. Recent studies have revealed that AMP-activated protein kinase (AMPK) activators decrease sensory neuron excitability, potentially by preventing sodium (Na+) channel phosphorylation by kinases such as ERK or via modulation of translation regulation pathways. The direct positive allosteric modulator A769662 displays substantially greater efficacy than other AMPK activators in decreasing sensory neuron excitability suggesting additional mechanisms of action. Here, we show that A769662 acutely inhibits AP firing stimulated by ramp current injection in rat trigeminal ganglion (TG) neurons. PT1, a structurally dissimilar AMPK activator that reduces nerve growth factor (NGF) -induced hyperexcitability, has no influence on AP firing in TG neurons upon acute application. In voltage-clamp recordings, application of A769662 reduces VGSC current amplitudes. These findings, based on acute A769662 application, suggest a direct channel blocking effect. Indeed, A769662 dose-dependently blocks VGSC in rat TG neurons and in Nav1.7-transfected cells with an IC50 of ~ 10 μM. A769662 neither displayed use-dependent inhibition nor interacted with the local anesthetic (LA) binding site. Popliteal fossa administration of A769662 decreased noxious thermal responses with a peak effect at 5 mins demonstrating an analgesic effect. These data indicate that in addition to AMPK activation, A769662 acts as a direct blocker/modulator of VGSCs, a potential mechanism enhancing the analgesic property of this compound.
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Affiliation(s)
- Marina N. Asiedu
- University of Arizona, Department of Pharmacology, Tucson, Arizona, United States of America
- University of Texas at Dallas, School of Behavioral and Brain Sciences, Richardson, Texas, United States of America
| | - Chongyang Han
- Yale School of Medicine, Department of Neurology, Center for Neuroscience and Regeneration Research, and Veterans Administration Connecticut Healthcare System, Rehabilitation Research Center, West Haven, Connecticut, United States of America
| | - Sulayman D. Dib-Hajj
- Yale School of Medicine, Department of Neurology, Center for Neuroscience and Regeneration Research, and Veterans Administration Connecticut Healthcare System, Rehabilitation Research Center, West Haven, Connecticut, United States of America
| | - Stephen G. Waxman
- Yale School of Medicine, Department of Neurology, Center for Neuroscience and Regeneration Research, and Veterans Administration Connecticut Healthcare System, Rehabilitation Research Center, West Haven, Connecticut, United States of America
| | - Theodore J. Price
- University of Arizona, Department of Pharmacology, Tucson, Arizona, United States of America
- University of Texas at Dallas, School of Behavioral and Brain Sciences, Richardson, Texas, United States of America
| | - Gregory Dussor
- University of Arizona, Department of Pharmacology, Tucson, Arizona, United States of America
- University of Texas at Dallas, School of Behavioral and Brain Sciences, Richardson, Texas, United States of America
- * E-mail:
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Abstract
The structural similarity of eugenol with capsaicin suggests that these two agents may share molecular mechanisms to produce their effects. We investigated the effects of eugenol in comparison with those of capsaicin using whole-cell patch clamp and Fura-2-based calcium-imaging techniques in a heterologous expression system and with sensory neurons. In vanilloid receptor 1 (VR1)-expressing human embryonic kidney (HEK) 293 cells and trigeminal ganglion (TG) neurons, eugenol activated inward currents, whereas capsazepine, a competitive VR antagonist, and ruthenium red (RR), a functional VR antagonist, completely blocked eugenol-induced inward currents. Moreover, eugenol caused elevation of [Ca2+]i, and this was completely abolished by both capsazepine and ruthenium red in VR1-expressing HEK 293 cells and TG neurons. Our results provide strong evidence that eugenol produces its effects, at least in part, via VR1 expressed by the sensory nerve endings in the teeth.
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Affiliation(s)
- B H Yang
- Department of Physiology, College of Dentistry and Dental Research Institute, Seoul National University, 28-2 Yeongeon-Dong ChongNo-Ku, Seoul, Korea 110-749
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Yamagata K, Sugimura M, Yoshida M, Sekine S, Kawano A, Oyamaguchi A, Maegawa H, Niwa H. Estrogens Exacerbate Nociceptive Pain via Up-Regulation of TRPV1 and ANO1 in Trigeminal Primary Neurons of Female Rats. Endocrinology 2016; 157:4309-4317. [PMID: 27689413 DOI: 10.1210/en.2016-1218] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Several trigeminal pain disorders show sex differences, and high levels of estrogens may underlie these differences. The interaction between transient receptor potential vanilloid 1 (TRPV1) and anoctamin 1 (ANO1) plays an important role in peripheral nociception. However, whether TRPV1 and ANO1 are involved in estrogen-modulated trigeminal pain sensitivity is unclear. In this study, we examined estradiol (E2) modulation of nociception through behavioral and immunohistological experiments after application of capsaicin (Cap), a selective TRPV1 agonist, onto the ocular surface in ovariectomized rats treated with high-dose E2 (HE) or low-dose E2 (LE) for 2 days. In addition, we used real-time PCR to study the effects of E2 on the expression levels of TRPV1 and ANO1 mRNA in trigeminal ganglia. In the behavioral experiment, the HE group showed significant potentiation of Cap-evoked nocifensive behavior compared with the LE group. Immunohistochemistry showed that Cap evoked a significantly greater number of cells that were immunoreactive for c-Fos, a marker of nociceptive activation, in the trigeminal subnucleus caudalis/upper cervical cord in the HE group than in the LE group. The number of c-Fos-immunoreactive cells in the ventral trigeminal interpolaris/caudalis were similar in the 2 groups. Real-time PCR showed that the levels of TRPV1 and ANO1 mRNA in the HE group were significantly higher than levels in the LE group. Thus, high levels of estrogens may be a risk factor for Cap-evoked nociceptive pain, and estrogen-dependent increases in TRPV1 and ANO1 are likely involved in modulating the nociceptive response in the trigeminal area.
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Affiliation(s)
- Kazuaki Yamagata
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Mitsutaka Sugimura
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Miki Yoshida
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Shinichi Sekine
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Akiyo Kawano
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Aiko Oyamaguchi
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Hiroharu Maegawa
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
| | - Hitoshi Niwa
- Department of Dental Anesthesiology (K.Y., M.Y., A.K., A.O., H.M., H.N.), Osaka University Graduate School of Dentistry, Suita City, Osaka, 565-0871 Japan; Department of Dental Anesthesiology (M.S.), Field of Oral Maxillofacial Rehabilitation, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan; and Division of Special Care Dentistry (S.S.), Osaka University Graduate School of Dentistry, Suita City, Osaka, Japan
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Cornelison LE, Hawkins JL, Durham PL. Elevated levels of calcitonin gene-related peptide in upper spinal cord promotes sensitization of primary trigeminal nociceptive neurons. Neuroscience 2016; 339:491-501. [PMID: 27746346 DOI: 10.1016/j.neuroscience.2016.10.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 09/27/2016] [Accepted: 10/03/2016] [Indexed: 01/08/2023]
Abstract
Orofacial pain conditions including temporomandibular disorder (TMD) and migraine are characterized by peripheral and central sensitization of trigeminal nociceptive neurons. The goal of this study was to investigate the role of calcitonin gene-related peptide (CGRP) in promoting bidirectional signaling within the trigeminal system to mediate sensitization of primary nociceptive neurons. Adult male Sprague-Dawley rats were injected intercisternally with CGRP or co-injected with the receptor antagonist CGRP8-37 or KT 5720, a protein kinase A (PKA) inhibitor. Nocifensive head withdrawal response to mechanical stimulation was investigated using von Frey filaments. Expression of PKA, glial fibrillary acidic protein (GFAP), and ionized calcium-binding adapter molecule 1 (Iba1) in the spinal cord and phosphorylated extracellular signal-regulated kinase (P-ERK) in the ganglion was studied using immunohistochemistry. Some animals were co-injected with CGRP and Fast Blue dye and the ganglion was imaged using fluorescent microscopy. CGRP increased nocifensive responses to mechanical stimulation when compared to control. Co-injection of CGRP8-37 or KT 5720 with CGRP inhibited the nocifensive response. CGRP stimulated PKA and GFAP expression in the spinal cord, and P-ERK in ganglion neurons. Seven days post injection, Fast Blue was observed in ganglion neurons and satellite glial cells. Our results demonstrate that elevated levels of CGRP in the upper spinal cord promote sensitization of primary nociceptive neurons via a mechanism that involves activation of PKA centrally and P-ERK in ganglion neurons. Our findings provide evidence of bidirectional signaling within the trigeminal system that facilitate increased neuron-glia communication within the ganglion associated with trigeminal sensitization.
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Affiliation(s)
- Lauren E Cornelison
- Center for Biomedical and Life Sciences, Missouri State University, Springfield, MO, USA
| | - Jordan L Hawkins
- Center for Biomedical and Life Sciences, Missouri State University, Springfield, MO, USA
| | - Paul L Durham
- Center for Biomedical and Life Sciences, Missouri State University, Springfield, MO, USA.
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Nakamura M, Kim DY, Jang IS. Acid modulation of tetrodotoxin-sensitive Na + channels in large-sized trigeminal ganglion neurons. Brain Res 2016; 1651:44-52. [PMID: 27639809 DOI: 10.1016/j.brainres.2016.09.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 07/29/2016] [Accepted: 09/13/2016] [Indexed: 12/13/2022]
Abstract
Voltage-gated Na+ channels in primary afferent neurons can be divided into tetrodotoxin-sensitive (TTX-S) and tetrodotoxin-resistant (TTX-R) Na+ channels. Although previous studies have shown the acid modulation of TTX-R Na+ channels, the effect of acidic pH on tetrodotoxin-sensitive (TTX-S) Na+ channels is still unknown. Here we report the effect of acidic pH on TTX-S Na+ channels expressed in large-sized trigeminal ganglion (TG) neurons using a whole-cell patch clamp technique. The application of acidic extracellular solution decreased the peak amplitude of TTX-S currents (INa) in a pH-dependent manner, but weak acid (≥pH 6.0) had no inhibitory effect on TTX-S INa. Acidic pH (pH 6.0) shifted both the activation and steady-state fast inactivation relationships of TTX-S Na+ channels toward depolarized potentials. However, acidic pH (pH 6.0) had no effect on use-dependent inhibition in response to high-frequency stimuli, development of inactivation, and accelerated the recovery from inactivation of TTX-S Na+ channels, suggesting that TTX-S Na+ channels in large-sized TG neurons are less sensitive to acidic pH. Given that voltage-gated Na+ channels play a pivotal role in the generation and conduction of action potentials in neural tissues, the insensitivity of TTX-S Na+ channels expressed in large-sized TG neurons to acidic pH would ensure transmission of innocuous tactile sensation from orofacial regions at acidic pH conditions.
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Affiliation(s)
- Michiko Nakamura
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-412, Republic of Korea
| | - Do-Yeon Kim
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-412, Republic of Korea
| | - Il-Sung Jang
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-412, Republic of Korea.
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Lehmann R, Hatt H, van Thriel C. Alternative in vitro assays to assess the potency of sensory irritants-Is one TRP channel enough? Neurotoxicology 2016; 60:178-186. [PMID: 27545873 DOI: 10.1016/j.neuro.2016.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 08/16/2016] [Accepted: 08/16/2016] [Indexed: 11/18/2022]
Abstract
One important function of the peripheral nervous system is the detection of noxious chemicals in the environment as well as the recognition of tissue damage throughout the body. Transient receptor potential (TRP) ion channels are able to sense a multitude of signaling factors involved in these processes. Via the sensory ganglia these sentinels convey information to the central nervous system, where perceptions of nociception or sensory irritation are generated. From the 28 members of the 6 subfamilies present in mammals, researchers in toxicology paid special attention to TRPA1 and TRPV1 channels. Various xenobiotics (e.g., acrolein, formaldehyde) can open these channels causing sensory irritations and defense mechanisms like sneezing, coughing and lacrimation. Heterologous expression of these two channels and the subsequent investigation of ion fluxes have been proposed as in vitro models for the assessment of sensory irritation. In a series of experiments using acetophenone, isophorone, and 2-ethylhexanol (2-EH) we investigated the effects of these irritants on heterologously expressed TRP channels in comparison to a primary cell culture of trigeminal ganglia neurons of mice. We confirmed acetophenone as a specific TRPA1 agonist that activates the receptor in concentrations >3mM, whereas isophorone specifically activates TRPV1 in concentrations >100μM. 2-EH can activate heterologously expressed TRPA1 concentration-dependently (1 mM-10mM). In Ca2+ imaging we observed 2-EH as an agonist of multiple channels (TRPA1, TRPV1, GPCRs) that activates the trigeminal neurons by application of μM 2-EH concentrations. The convergent results of our experiments further support the specificity of acetophenone and isophorone to activate only one of these investigated TRP channels and a more unspecific activation in the case of 2-EH. However, the results of the two different in vitro systems also showed that both TRPA1 and TRPV1 channel activation is important for the perception of irritants and only the combined and tiered testing might lead to precise estimates describing the potency of a xenobiotic to cause sensory irritation or pain.
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Affiliation(s)
- Ramona Lehmann
- IfADo-Leibniz Research Center for Working Environment and Human Factors, 44139 Dortmund, Germany.
| | - Hanns Hatt
- Department of Cell Physiology, Ruhr University Bochum, Universitätsstr. 150, D-44780 Bochum, Germany
| | - Christoph van Thriel
- IfADo-Leibniz Research Center for Working Environment and Human Factors, 44139 Dortmund, Germany
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Abstract
Triptans are commonly used anti-migraine drugs and show agonist action mainly at serotonin 5-HT1B/1D/1F receptors. It is not known whether frequent or long-term treatment with these drugs would alter 5-HT receptor function. We investigated the effects of protracted (14-18 days) sumatriptan and zolmitriptan treatment in rats on 5-HT1 receptor mRNA expression and function in tissues related to migraine pathophysiology. RT-PCR analysis revealed that 5-HT1B/1D/1F receptor mRNA was reduced in the trigeminal ganglion after treatment with either triptan (reduction by: sumatriptan 39% and zolmitriptan 61% for 5-HT1B; 60% vs 41% for 5-HT1D; 32% vs 68% for 5-HT1F). Sumatriptan attenuated 5-HT1D receptor mRNA by 49% in the basilar artery, whereas zolmitriptan reduced 5-HT1B mRNA in this tissue by 70%. No change in 5-HT1 receptor mRNA expression was observed in coronary artery and dura mater. Chronic triptan treatment had no effect in two functional assays [sumatriptan mediated inhibition (50 mg/kg, i.p.) of electrically induced plasma protein extravasation in dura mater and 5-nonyloxytryptaminestimulated [35S]guanosine-5′-O-(3-thio)triphosphate binding in substantia nigra]. Furthermore, vasoconstriction to 5-HT in isolated basilar artery was not affected by chronic triptan treatment, while it was slightly reduced in coronary artery. We conclude that, although our treatment protocol altered mRNA receptor expression in several tissues relevant to migraine pathophysiology, it did not attenuate 5-HT1 receptor-dependent functions in rats.
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Affiliation(s)
- U Reuter
- Stroke and Neurovascular Regulation Laboratory, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA.
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Hougaard Pedersen S, Maretty L, Ramachandran R, Sibbesen JA, Yakimov V, Elgaard-Christensen R, Hansen TF, Krogh A, Olesen J, Jansen-Olesen I. RNA Sequencing of Trigeminal Ganglia in Rattus Norvegicus after Glyceryl Trinitrate Infusion with Relevance to Migraine. PLoS One 2016; 11:e0155039. [PMID: 27213950 PMCID: PMC4877077 DOI: 10.1371/journal.pone.0155039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 04/22/2016] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION Infusion of glyceryl trinitrate (GTN), a donor of nitric oxide, induces immediate headache in humans that in migraineurs is followed by a delayed migraine attack. In order to achieve increased knowledge of mechanisms activated during GTN-infusion this present study aims to investigate transcriptional responses to GTN-infusion in the rat trigeminal ganglia. METHODS Rats were infused with GTN or vehicle and trigeminal ganglia were isolated either 30 or 90 minutes post infusion. RNA sequencing was used to investigate transcriptomic changes in response to the treatment. Furthermore, we developed a novel method for Gene Set Analysis Of Variance (GSANOVA) to identify gene sets associated with transcriptional changes across time. RESULTS 15 genes displayed significant changes in transcription levels in response to GTN-infusion. Ten of these genes showed either sustained up- or down-regulation in the 90-minute period after infusion. The GSANOVA analysis demonstrate enrichment of pathways pointing towards an increase in immune response, signal transduction, and neuroplasticity in response to GTN-infusion. Future functional in-depth studies of these mechanisms are expected to increase our understanding of migraine pathogenesis.
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Affiliation(s)
- Sara Hougaard Pedersen
- Danish Headache Center, Department of Neurology, Glostrup Research Institute, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lasse Maretty
- The Bioinformatics Centre, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Roshni Ramachandran
- Danish Headache Center, Department of Neurology, Glostrup Research Institute, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jonas Andreas Sibbesen
- The Bioinformatics Centre, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Victor Yakimov
- The Bioinformatics Centre, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Rikke Elgaard-Christensen
- Danish Headache Center, Department of Neurology, Glostrup Research Institute, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Folkmann Hansen
- Danish Headache Center, Department of Neurology, Glostrup Research Institute, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anders Krogh
- The Bioinformatics Centre, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Jes Olesen
- Danish Headache Center, Department of Neurology, Glostrup Research Institute, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Inger Jansen-Olesen
- Danish Headache Center, Department of Neurology, Glostrup Research Institute, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Qi D, Yang Y, Ji P, Kong J, Wu Q, Si H. Upregulation of the Purinergic Receptor Subtype P2X3 in the Trigeminal Ganglion Is Involved in Orofacial Pain Induced by Occlusal Interference in Rats. J Oral Facial Pain Headache 2016; 30:51-60. [PMID: 26817033 DOI: 10.11607/ofph.1459] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIMS To evaluate whether the purinergic receptor subtype P2X3 (P2X3R) in trigeminal ganglion (TG) neurons is involved in hyperalgesia of the temporomandibular joints (TMJs) and masseter muscles associated with placement of an occlusal interference. METHODS Forty-five rats were randomized into five groups (ie, for days 1, 3, 7, 14, or 28; nine rats per group). Six rats from each group were chosen to receive the occlusal interference, and the remaining three rats were sham-treated controls. On days 1, 3, 7, 14, and 28 after placement of the occlusal interference, the mechanical pain threshold (MPT) to stimulation of the TMJs or masseter muscles was examined using von Frey filaments. Seven days after the occlusal interference placement, changes in MPT were tested after administration of the P2X3R antagonist A-317491 into the TMJs and masseter muscles (60 μg/site) in six rats. The expression of P2X3R in the TGs was investigated by immunohistochemistry and quantitative polymerase chain reaction (qPCR). Retrograde tracing was combined with immunofluorescence to identify TMJ and masseter muscle afferent neurons in the TGs of six premature rats. RESULTS The TMJ and masseter muscle MPTs were decreased after placement of the occlusal interference, and the P2X3R antagonist reversed the mechanical hyperalgesia that was caused by the occlusal interference placement. The frequency of P2X3R-immunoreactive cells increased in small-sized neurons in the TG after occlusal interference. By contrast, there was no increase in medium-sized TG neurons. P2X3R mRNA increased on day 3. Retrograde tracing indicated that the TMJ and masseter muscle afferent neurons in the TG expressed P2X3R. CONCLUSION Upregulated P2X3R expression in the TG may contribute to orofacial pain development induced by an occlusal interference. P2X3R may be a therapeutic target for chronic TMJ or masseter muscle pain.
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Bi RY, Ding Y, Gan YH. Non-steroidal Anti-inflammatory Drugs Attenuate Hyperalgesia and Block Upregulation of Trigeminal Ganglionic Sodium Channel 1.7 after Induction of Temporomandibular Joint Inflammation in Rats. Chin J Dent Res 2016; 19:35-42. [PMID: 26981605 DOI: 10.3290/j.cjdr.a35695] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To investigate the association between the analgesic effect of non-steroidal antiinflammatory drugs (NSAIDs) and sodium channel 1.7 (Nav1.7) expression in the trigeminal ganglion (TG). METHODS Temporomandibular joint (TMJ) inflammation was induced by complete Freund's adjuvant (CFA) in female rats. Ibuprofen, diclofenac sodium and meloxicam were given intragastrically before induction of TMJ inflammation. Histopathological evaluation and scoring of TMJ inflammation was used to evaluate the level of inflammation. The head withdrawal threshold and food intake were measured to evaluate TMJ nociceptive responses. The mRNA and protein expression of trigeminal ganglionic Nav1.7 was examined using real-time polymerase chain reaction and western blot. RESULTS Twenty-four hours after the injection of CFA into the TMJs, NSAIDs attenuated hyperalgesia of inflamed TMJ and simultaneously blocked inflammation-induced upregulation of Nav1.7 mRNA and protein expression in the TG. However, ibuprofen and diclofenac sodium slightly attenuated TMJ inflammation and meloxicam did not affect TMJ inflammation. CONCLUSION Attenuation of hyperalgesia of inflamed TMJ by NSAIDs might be associated with their role in blocking upregulation of trigeminal ganglionic Nav1.7.
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Payrits M, Sághy É, Mátyus P, Czompa A, Ludmerczki R, Deme R, Sándor Z, Helyes Z, Szőke É. A novel 3-(4,5-diphenyl-1,3-oxazol-2-yl)propanal oxime compound is a potent Transient Receptor Potential Ankyrin 1 and Vanilloid 1 (TRPA1 and V1) receptor antagonist. Neuroscience 2016; 324:151-62. [PMID: 26930003 DOI: 10.1016/j.neuroscience.2016.02.049] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 02/20/2016] [Accepted: 02/22/2016] [Indexed: 12/20/2022]
Abstract
Transient Receptor Potential Ankyrin 1 and Vanilloid 1 (TRPA1, TRPV1) ion channels expressed on nociceptive primary sensory neurons are important regulators of pain and inflammation. TRPA1 is activated by several inflammatory mediators including formaldehyde and methylglyoxal that are products of the semicarbazide-sensitive amine-oxidase enzyme (SSAO). SZV-1287 is a new 3-(4,5-diphenyl-1,3-oxazol-2-yl)propanal oxime SSAO inhibitor, its chemical structure is similar to other oxime derivatives described as TRPA1 antagonists. Therefore, we investigated its effects on TRPA1 and TRPV1 receptor activation on the cell bodies and peripheral terminals of primary sensory neurons and TRPA1 or TRPV1 receptor-expressing cell lines. Calcium influx in response to the TRPA1 agonist allyl-isothiocyanate (AITC) (200 μM) and the TRPV1 stimulator capsaicin (330 nM) in rat trigeminal neurons or TRPA1 and TRPV1 receptor-expressing cell lines was measured by microfluorimetry or radioactive (45)Ca(2+) uptake experiments. Calcitonin gene-related peptide (CGRP) release as the indicator of 100 μM AITC - or 100 nM capsaicin-induced peripheral sensory nerve terminal activation was measured by radioimmunoassay. SZV-1287 (100, 500 and 1000 nM) exerted a concentration-dependent significant inhibition on both AITC- and capsaicin-evoked calcium influx in trigeminal neurons and TRPA1 or TRPV1 receptor-expressing cell lines. It also significantly inhibited the TRPA1, but not the TRPV1 activation-induced CGRP release from the peripheral sensory nerve endings in a concentration-dependent manner. In contrast, the reference SSAO inhibitor LJP 1207 with a different structure had no effect on TRPA1 or TRPV1 activation in either model system. This is the first evidence that our novel oxime compound SZV-1287 originally developed as a SSAO inhibitor has a potent dual antagonistic action on TRPA1 and TRPV1 ion channels on primary sensory neurons.
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Affiliation(s)
- M Payrits
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs-7624, Szigeti str. 12., Hungary; Szentágothai Research Centre, University of Pécs, Pécs-7624, Ifjúság str. 20., Hungary.
| | - É Sághy
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs-7624, Szigeti str. 12., Hungary; Szentágothai Research Centre, University of Pécs, Pécs-7624, Ifjúság str. 20., Hungary.
| | - P Mátyus
- Department of Organic Chemistry, University of Semmelweis, Budapest-1092, Hőgyes Endre str. 7., Hungary.
| | - A Czompa
- Department of Organic Chemistry, University of Semmelweis, Budapest-1092, Hőgyes Endre str. 7., Hungary.
| | - R Ludmerczki
- Department of Organic Chemistry, University of Semmelweis, Budapest-1092, Hőgyes Endre str. 7., Hungary.
| | - R Deme
- Department of Organic Chemistry, University of Semmelweis, Budapest-1092, Hőgyes Endre str. 7., Hungary.
| | - Z Sándor
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs-7624, Szigeti str. 12., Hungary.
| | - Zs Helyes
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs-7624, Szigeti str. 12., Hungary; Szentágothai Research Centre, University of Pécs, Pécs-7624, Ifjúság str. 20., Hungary; MTA-PTE Chronic Pain Research Group, Pécs-7624, Szigeti str. 12., Hungary.
| | - É Szőke
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs-7624, Szigeti str. 12., Hungary; Szentágothai Research Centre, University of Pécs, Pécs-7624, Ifjúság str. 20., Hungary; MTA-PTE Chronic Pain Research Group, Pécs-7624, Szigeti str. 12., Hungary.
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Szánti-Pintér E, Wouters J, Gömöry Á, Sághy É, Szőke É, Helyes Z, Kollár L, Skoda-Földes R. Synthesis of novel 13α-18-norandrostane-ferrocene conjugates via homogeneous catalytic methods and their investigation on TRPV1 receptor activation. Steroids 2015; 104:284-93. [PMID: 26519768 DOI: 10.1016/j.steroids.2015.10.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 09/09/2015] [Accepted: 10/27/2015] [Indexed: 10/22/2022]
Abstract
13α-Steroid-ferrocene derivatives were synthesized via two reaction pathways starting from an unnatural 16-keto-18-nor-13α-steroid. The unnatural steroid was converted to ferrocene derivatives via copper-catalyzed azide-alkyne cycloaddition or palladium-catalyzed aminocarbonylation. 16-Azido- and 16-N-(prop-2-ynyl)-carboxamido-steroids were synthesized as starting materials for azide-alkyne cycloaddition with the appropriate ferrocene derivatives. Based on our earlier work, aminocarbonylation of 16-iodo-16-ene and 16-iodo-15-ene derivatives was studied with ferrocenylmethylamine. The new products were obtained in moderate to good yields and were characterized by (1)H and (13)C NMR, IR and MS. The solid state structure of the starting material 13α-18-norandrostan-16-one and two carboxamide products were determined by X-ray crystallography. Evidences were provided that the N-propargyl-carboxamide compound as well as its ferrocenylmethyltriazole derivative are able to decrease the activation of TRPV1 receptor on TRG neurons.
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Affiliation(s)
- Eszter Szánti-Pintér
- University of Pannonia, Institute of Chemistry, Department of Organic Chemistry, Egyetem u. 10 (P.O. Box 158), H-8200 Veszprém, Hungary
| | - Johan Wouters
- University of Namur, Department of Chemistry, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Ágnes Gömöry
- Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Éva Sághy
- Department of Pharmacology and Pharmacotherapy, Szentágothai Research Center, MTA-PTE Chronic Pain Research Group, University of Pécs, Ifjúság u. 6 (P.O. Box 266), H-7624 Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Szentágothai Research Center, MTA-PTE Chronic Pain Research Group, University of Pécs, Ifjúság u. 6 (P.O. Box 266), H-7624 Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Szentágothai Research Center, MTA-PTE Chronic Pain Research Group, University of Pécs, Ifjúság u. 6 (P.O. Box 266), H-7624 Pécs, Hungary
| | - László Kollár
- University of Pécs, Department of Inorganic Chemistry and MTA-PTE Research Group for Selective Chemical Syntheses, Ifjúság u. 6 (P.O. Box 266), H-7624 Pécs, Hungary
| | - Rita Skoda-Földes
- University of Pannonia, Institute of Chemistry, Department of Organic Chemistry, Egyetem u. 10 (P.O. Box 158), H-8200 Veszprém, Hungary.
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Sághy É, Payrits M, Helyes Z, Reglődi D, Bánki E, Tóth G, Couvineau A, Szőke É. Stimulatory effect of pituitary adenylate cyclase-activating polypeptide 6-38, M65 and vasoactive intestinal polypeptide 6-28 on trigeminal sensory neurons. Neuroscience 2015; 308:144-56. [PMID: 26321242 DOI: 10.1016/j.neuroscience.2015.08.043] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 07/31/2015] [Accepted: 08/20/2015] [Indexed: 02/08/2023]
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) acts on G protein-coupled receptors: the specific PAC1 and VPAC1/VPAC2 receptors. PACAP6-38 was described as a potent PAC1/VPAC2 antagonist in several models, but recent studies reported its agonistic behaviors proposing novel receptorial mechanisms. Since PACAP in migraine is an important research tool, we investigated the effect of PACAP and its peptide fragments on trigeminal primary sensory neurons. Effect of the peptides was studied with ratiometric Ca-imaging technique using the fluorescent indicator fura-2 AM on primary cultures of rat and mouse trigeminal ganglia (TRGs) neurons. Specificity testing was performed on PAC1, VPAC1 and VPAC2 receptor-expressing cell lines with both fluorescent and radioactive Ca-uptake methods. Slowly increasing intracellular free calcium concentration [Ca(2+)]i was detected after PACAP1-38, PACAP1-27, vasoactive intestinal polypeptide (VIP) and the selective PAC1 receptor agonist maxadilan administration on TRG neurons, but interestingly, PACAP6-38, VIP6-28 and the PAC1 receptor antagonist M65 also caused similar activation. The VPAC2 receptor agonist BAY 55-9837 induced similar activation, while the VPAC1 receptor agonist Ala(11,22,28)VIP had no significant effect on [Ca(2+)]i. It was proven that the Ca(2+)-influx originated from intracellular stores using radioactive calcium-45 uptake experiment and Ca-free solution. On the specific receptor-expressing cell lines the antagonists inhibited the stimulating actions of the respective agonists, but had no effects by themselves. PACAP6-38, M65 and VIP6-28, which were described as antagonists in numerous studies in several model systems, act as agonists on TRG primary sensory neurons. Currently unknown receptors or splice variants linked to distinct signal transduction pathways might explain these differences.
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MESH Headings
- Animals
- CHO Cells
- Calcium/metabolism
- Cells, Cultured
- Cricetulus
- Humans
- Insect Proteins/pharmacology
- Mice
- Peptide Fragments/pharmacology
- Pituitary Adenylate Cyclase-Activating Polypeptide/pharmacology
- Rats, Wistar
- Receptors, Vasoactive Intestinal Peptide, Type II/antagonists & inhibitors
- Receptors, Vasoactive Intestinal Peptide, Type II/metabolism
- Receptors, Vasoactive Intestinal Polypeptide, Type I/agonists
- Receptors, Vasoactive Intestinal Polypeptide, Type I/metabolism
- Sensory Receptor Cells/drug effects
- Sensory Receptor Cells/physiology
- Sensory System Agents/pharmacology
- TRPV Cation Channels/metabolism
- Trigeminal Ganglion/drug effects
- Trigeminal Ganglion/physiology
- Vasoactive Intestinal Peptide/pharmacology
- Voltage-Sensitive Dye Imaging
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Affiliation(s)
- É Sághy
- Department of Pharmacology and Pharmacotherapy, MTA-PTE Chronic Pain Research Group, Szentágothai Research Center, University of Pécs, Pécs-7624, Szigeti Street 12, Hungary.
| | - M Payrits
- Department of Pharmacology and Pharmacotherapy, MTA-PTE Chronic Pain Research Group, Szentágothai Research Center, University of Pécs, Pécs-7624, Szigeti Street 12, Hungary.
| | - Zs Helyes
- Department of Pharmacology and Pharmacotherapy, MTA-PTE Chronic Pain Research Group, Szentágothai Research Center, University of Pécs, Pécs-7624, Szigeti Street 12, Hungary.
| | - D Reglődi
- Department of Anatomy, MTA-PTE "Lendület" PACAP Research Team, University of Pécs, Pécs-7624, Szigeti Street 12, Hungary.
| | - E Bánki
- Department of Anatomy, MTA-PTE "Lendület" PACAP Research Team, University of Pécs, Pécs-7624, Szigeti Street 12, Hungary.
| | - G Tóth
- Department of Medical Chemistry, University of Szeged, Szeged-6720, Dugonics Street 13, Hungary.
| | - A Couvineau
- UMR 1149 INSERM/Centre de Recherche sur l'Inflammation, Université Paris Diderot, Faculte de Medecine Paris 7 - Site Bichat, 16 Rue Henri Huchard, 75890 Paris Cedex 18, France.
| | - É Szőke
- Department of Pharmacology and Pharmacotherapy, MTA-PTE Chronic Pain Research Group, Szentágothai Research Center, University of Pécs, Pécs-7624, Szigeti Street 12, Hungary.
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Yisarakun W, Chantong C, Supornsilpchai W, Thongtan T, Srikiatkhachorn A, Reuangwechvorachai P, Maneesri-le Grand S. Up-regulation of calcitonin gene-related peptide in trigeminal ganglion following chronic exposure to paracetamol in a CSD migraine animal model. Neuropeptides 2015; 51:9-16. [PMID: 25998753 DOI: 10.1016/j.npep.2015.03.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 03/02/2015] [Accepted: 03/30/2015] [Indexed: 12/24/2022]
Abstract
Previously, our group has demonstrated that chronic paracetamol (APAP) treatment induces alterations to the trigeminovascular nociceptive system in the cortical spreading depression (CSD) migraine animal model. The calcitonin gene related peptide (CGRP) is a key neuropeptide involved in the activation of the trigeminovascular nociceptive system. Therefore, this study examined the expression levels of CGRP in the trigeminal ganglion (TG) after chronic APAP exposure (0, 15, and 30 days) using a CSD model. Rats were divided into control, CSD only, APAP only and APAP treatment with CSD groups. A single injection (i.p.) of APAP (200 mg/kg body weight) was given to the 0-day APAP-treated groups, while the other APAP-treated groups received daily injections for 15 and 30 days. CSD was induced by the topical application of KCl to the parietal cortex. The protein expression of CGRP in the TG was evaluated by immunohistochemistry, and the CGRP mRNA level was investigated by real-time quantitative reverse transcription polymerase chain reaction. The results revealed that the induction of CSD significantly increased the level of CGRP protein but had no effect on CGRP mRNA level. Pretreatment with APAP 1 hour before CSD activation significantly reduced CGRP expression induced by CSD. In contrast, chronic treatment with APAP (15 and 30 days) significantly enhanced CGRP expression in both protein and mRNA levels when compared with the control groups. In combination with CSD, the expression of CGRP further increased in the animal with 30 day treatment. These findings indicate that chronic treatment with APAP induces an increase of CGRP expression in the TG. This alteration may be associated with the increased trigeminovascular nociception observed in our previous studies.
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Affiliation(s)
- Waranurin Yisarakun
- Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Chattraporn Chantong
- Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Weera Supornsilpchai
- Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok 10330, Thailand
| | - Thananya Thongtan
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Anan Srikiatkhachorn
- Department of Physiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Supang Maneesri-le Grand
- Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
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Chung MK, Asgar J, Lee J, Shim MS, Dumler C, Ro JY. The role of TRPM2 in hydrogen peroxide-induced expression of inflammatory cytokine and chemokine in rat trigeminal ganglia. Neuroscience 2015; 297:160-9. [PMID: 25849615 DOI: 10.1016/j.neuroscience.2015.03.067] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 03/31/2015] [Indexed: 12/30/2022]
Abstract
Trigeminal ganglia (TG) contain neuronal cell bodies surrounded by satellite glial cells. Although peripheral injury is well known to induce changes in gene expression within sensory ganglia, detailed mechanisms whereby peripheral injury leads to gene expression within sensory ganglia are not completely understood. Reactive oxygen species (ROS) are an important modulator of hyperalgesia, but the role of ROS generated within sensory ganglia is unclear. Since ROS are known to affect transcription processes, ROS generated within sensory ganglia could directly influence gene expression and induce cellular changes at the soma level. In this study, we hypothesized that peripheral inflammation leads to cytokine and chemokine production and ROS generation within TG and that transient receptor potential melastatin (TRPM2), a well known oxidative sensor, contributes to ROS-induced gene regulation within TG. The masseter injection of complete Freund's adjuvant (CFA) resulted in a significantly elevated level of ROS within TG of the inflamed side with a concurrent increase in cytokine expression in TG. Treatment of TG cultures with H2O2 significantly up-regulated mRNA and protein levels of cytokine/chemokine such as interleukin 6 (IL-6) and chemokine (C-X-C motif) ligand 2 (CXCL2). TRPM2 was expressed in both neurons and non-neuronal cells in TG, and pretreatment of TG cultures with 2-aminoethoxydiphenyl borate (2-APB), an inhibitor of TRPM2, or siRNA against TRPM2 attenuated H2O2-induced up-regulation of IL-6 and CXCL2. These results suggested that activation of TRPM2 could play an important role in the modulation of cytokine/chemokine expression within TG under oxidative stress and that such changes may contribute to amplification of nociceptive signals leading to pathological pain conditions.
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Affiliation(s)
- M-K Chung
- University of Maryland School of Dentistry, Department of Neural and Pain Sciences, Program in Neuroscience, United States
| | - J Asgar
- University of Maryland School of Dentistry, Department of Neural and Pain Sciences, Program in Neuroscience, United States
| | - J Lee
- University of Maryland School of Dentistry, Department of Neural and Pain Sciences, Program in Neuroscience, United States
| | - M S Shim
- University of Maryland School of Dentistry, Department of Neural and Pain Sciences, Program in Neuroscience, United States
| | - C Dumler
- University of Maryland School of Dentistry, Department of Neural and Pain Sciences, Program in Neuroscience, United States
| | - J Y Ro
- University of Maryland School of Dentistry, Department of Neural and Pain Sciences, Program in Neuroscience, United States.
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Hawkins JL, Denson JE, Miley DR, Durham PL. Nicotine stimulates expression of proteins implicated in peripheral and central sensitization. Neuroscience 2015; 290:115-25. [PMID: 25637801 PMCID: PMC5894823 DOI: 10.1016/j.neuroscience.2015.01.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/19/2014] [Accepted: 01/07/2015] [Indexed: 12/26/2022]
Abstract
Pain patients who are nicotine dependent report a significantly increased incidence and severity of pain intensity. The goal of this study was to determine the effects of prolonged nicotine administration on inflammatory proteins implicated in the development of peripheral and central sensitization of the trigeminal system. Behavioral, immunohistochemical, and microarray studies were utilized to investigate the effects of nicotine administered daily for 14 days via an Alzet® osmotic pump in Sprague Dawley rats. Systemic nicotine administration caused a significant increase in nocifensive withdrawals to mechanical stimulation of trigeminal neurons. Nicotine stimulated expression of the pro-inflammatory signal transduction proteins phosphorylated-extracellular signal-regulated kinase (p-ERK), phosphorylated-c-Jun N-terminal kinase (p-JNK), and protein kinase A (PKA) in the spinal trigeminal nucleus. Nicotine also promoted elevations in the expression of glial fibrillary acidic protein (GFAP), a biomarker of activated astrocytes, and the microglia biomarker ionized calcium-binding adapter molecule 1 (Iba1). Similarly, levels of eleven cytokines were significantly elevated with the largest increase in expression of TNF-α. Levels of PKA, p-ERK, and p-JNK in trigeminal ganglion neurons were increased by nicotine. Our findings demonstrate that prolonged systemic administration of nicotine promotes sustained behavioral and cellular changes in the expression of key proteins in the spinal trigeminal nucleus and trigeminal ganglion implicated in the development and maintenance of peripheral and central sensitization.
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Affiliation(s)
- J L Hawkins
- Center for Biomedical & Life Sciences, Missouri State University, Springfield, MO, USA
| | - J E Denson
- Center for Biomedical & Life Sciences, Missouri State University, Springfield, MO, USA
| | - D R Miley
- Center for Biomedical & Life Sciences, Missouri State University, Springfield, MO, USA
| | - P L Durham
- Center for Biomedical & Life Sciences, Missouri State University, Springfield, MO, USA.
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Nakamura M, Jang IS. Acid modulation of tetrodotoxin-resistant Na⁺ channels in rat nociceptive neurons. Neuropharmacology 2014; 90:82-9. [PMID: 25437826 DOI: 10.1016/j.neuropharm.2014.11.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2014] [Revised: 10/06/2014] [Accepted: 11/13/2014] [Indexed: 01/29/2023]
Abstract
Under pathological conditions including inflammation, ischemia and incision, extracellular pH falls down as low as 5.4. Although some mediators play pivotal roles in the development and maintenance of inflammatory hyperalgesia by affecting the functional properties of tetrodotoxin-resistant (TTX-R) Na(+) channels, the roles of tissue acidosis in nociceptive transmission mediated by TTX-R Na(+) channels are largely unknown. In the present study, we have investigated the effect of acidic pH on TTX-R Na(+) currents (I(Na)) in small-sized sensory neurons isolated from rat trigeminal ganglia using a whole-cell patch clamp technique. Acidic pH decreased the peak amplitude of TTX-R I(Na) in a pH-dependent manner, but weak acid (≥pH 6.0) had a minor inhibitory effect on the TTX-R I(Na). Acidic pH also significantly shifted both the activation and steady-state fast inactivation relationships toward depolarized potentials. In addition, acidic pH had little effect on the use-dependent inhibition, and significantly retarded the development of inactivation and accelerated the recovery from inactivation of TTX-R Na(+) channels. The results suggest that weak acid (≥pH 6.0) makes TTX-R Na(+) channels to be suitable for the repetitive activation at depolarized membrane potentials. Given that both tissue acidosis and inflammatory mediators in inflamed or injured tissues act synergistically to promote nociceptive transmission by affecting the functional properties of TTX-R Na(+) channels, these channels would be, at least in part, a good target to treat inflammatory pain.
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Affiliation(s)
- Michiko Nakamura
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea
| | - Il-Sung Jang
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-412, Republic of Korea.
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Dong Y, Li P, Ni Y, Zhao J, Liu Z. Decreased microRNA-125a-3p contributes to upregulation of p38 MAPK in rat trigeminal ganglions with orofacial inflammatory pain. PLoS One 2014; 9:e111594. [PMID: 25380251 PMCID: PMC4224409 DOI: 10.1371/journal.pone.0111594] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 10/03/2014] [Indexed: 11/23/2022] Open
Abstract
Orofacial inflammatory pain is a difficult clinical problem, and the specific molecular mechanisms for this pain remain largely unexplained. The present study aimed to determine the differential expression of microRNAs (miRNAs) and disclose the underlying role of miR-125a-3p in orofacial inflammatory pain induced by complete Freund's adjuvant (CFA). Thirty-two differentially expressed miRNAs were first screened using a microarray chip in ipsilateral trigeminal ganglions (TGs) following CFA injection into the orofacial skin innervated by trigeminal nerve, and a portion of them, including miR-23a*, -24-2*, -26a, -92a, -125a-3p, -183 and -299 were subsequently selected and validated by qPCR. The target genes were predicted based on the miRWalk website and were further analyzed by gene ontology (GO). Further studies revealed miR-125a-3p expression was down-regulated, whereas both the expression of p38 MAPK (mitogen-activated protein kinase) alpha and CGRP (calcitonin gene-related peptide) were up-regulated in ipsilateral TGs at different time points after CFA injection compared with control. Furthermore, mechanistic study revealed that miR-125a-3p negatively regulates p38 alpha gene expression and is positively correlated with the head withdrawal threshold reflecting pain. Luciferase assay showed that binding of miR-125a-3p to the 3′UTR of p38 alpha gene suppressed the transcriptional activity, and overexpression of miR-125a-3p significantly inhibited the p38 alpha mRNA level in ND8/34 cells. Taken together, our results show that miR-125a-3p is negatively correlated with the development and maintenance of orofacial inflammatory pain via regulating p38 MAPK.
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Affiliation(s)
- Yingchun Dong
- Department of Anesthesiology, Institute and Hospital of Stomatology, Nanjing University Medical School, Nanjing, China
- * E-mail: (YD); (ZL)
| | - Pengfei Li
- Department of Laboratory, Jiangsu Province Hospital of Traditional Chinese Medicine, Affiliated Hospital of Nanjing University of Traditional Chinese Medicine, Nanjing, China
| | - Yanhong Ni
- Central Laboratory, Institute and Hospital of Stomatology, Nanjing University Medical School, Nanjing, China
| | - Junjie Zhao
- Department of Periodontics, Institute and Hospital of Stomatology, Nanjing University Medical School, Nanjing, China
| | - Zhiqiang Liu
- Department of Lymphoma and Myeloma, the University of Texas MD Anderson Cancer Center, Houston, United States of America
- * E-mail: (YD); (ZL)
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Yue J, Zhang Y, Li X, Gong S, Tao J, Jiang X. Activation of G-protein-coupled receptor 30 increases T-type calcium currents in trigeminal ganglion neurons via the cholera toxin-sensitive protein kinase A pathway. Pharmazie 2014; 69:804-808. [PMID: 25985574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
G protein-coupled receptor 30 (GPR30) is a seven transmembrane domain G protein coupled receptor. In our study, GPR30 expression was found in trigeminal ganglia (TG) in mice, detected by RT-PCR and western blotting. We examined the effects of GPR30 activation on T-type calcium channels using GPR30-specific compound 1 (G-1), a GPR30-selective agonist, in TG neurons and demonstrated that G-1 induced an increase in T-type calcium channel currents (T-currents) in TGs. Intracellular infusion of GDP-β-S and pre-treatment of the neurons with cholera toxin (CTX) blocked the effects of G-1, suggesting that the G(s)-protein was involved. Intracellular application of the protein kinase A (PKA) inhibitor PKI 6-22 or pretreatment of the neurons with H89 abolished G-1 -induced enhancement of T-currents in TG neurons. However, incubation with PKC inhibitor elicited no such effects. In conclusion, our study shows that activation of GPR30 by G-1 increases T-currents via the CTX-sensitive and PKA-dependent pathway.
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