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Todorović M, Micov A, Nastić K, Tomić M, Pecikoza U, Vuković M, Stepanović-Petrović R. Vortioxetine as an analgesic in preclinical inflammatory pain models: Mechanism of action. Fundam Clin Pharmacol 2021; 36:237-249. [PMID: 34820899 DOI: 10.1111/fcp.12737] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/02/2021] [Accepted: 11/18/2021] [Indexed: 01/10/2023]
Abstract
Vortioxetine is a novel atypical antidepressant with multimodal activity that has recently demonstrated efficacy against neuropathic pain. There is no published data about its analgesic properties in models characterized by peripheral inflammation and consequent pain pathway sensitization, nor data on its mechanism of antinociceptive action. This study aimed to investigate vortioxetine's antinociceptive/antihyperalgesic effects in trigeminal, visceral, and somatic inflammatory pain models, and provide evidence on its mechanism of action in the modulation of trigeminal nociception. Vortioxetine's effects on the nociceptive behavior in orofacial formalin test (OFT) and acetic acid-writhing test in mice and on mechanical hyperalgesia in carrageenan-induced paw inflammation in rats were examined following peroral single administration. The involvement of serotonergic/adrenergic/cholinergic/cannabinoid/adenosine receptors was evaluated in OFT by intraperitoneally treating mice with an appropriate antagonist immediately after vortioxetine application. We used antagonists of 5-HT1B/1D serotonergic (GR 127935), α1 -adrenergic (prazosin), α2 -adrenergic (yohimbine), β1 -adrenergic (metoprolol), muscarinic (atropine), α7 nicotinic (methyllycaconitine), CB1 /CB2 cannabinoid (AM251 and AM630), and adenosine A1 (DPCPX) receptors. Vortioxetine dose-dependently reduced pain behavior in OFT and acetic acid writhing test, as well as inflammatory hyperalgesia in paw pressure test. All examined antagonists except prazosin dose-dependently inhibited vortioxetine's antinociceptive effects. In conclusion, vortioxetine exerted analgesic efficacy in trigeminal, visceral, and somatic inflammatory pain. The effect is at least in part mediated by 5-HT1B/1D serotonergic, α2 /β1 -adrenergic, muscarinic and nicotinic cholinergic, CB1 /CB2 cannabinoid, and adenosine A1 receptors. These findings contribute to better understanding of the analgesic effect of vortioxetine and suggest its potential usefulness for inflammatory pain treatment.
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Affiliation(s)
- Marija Todorović
- Department of Pharmacology, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Ana Micov
- Department of Pharmacology, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Katarina Nastić
- Department of Pharmacology, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Maja Tomić
- Department of Pharmacology, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Uroš Pecikoza
- Department of Pharmacology, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Milja Vuković
- Department of Pharmacology, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
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Gazerani P, Cairns BE, Yassin H, Yousefi JT, Sherzaman AR, Nedergaard BS, Boldsen SK. Amplification of glyceryl trinitrate-induced headache features by noxious craniofacial stimuli in pain-free healthy humans. Pain Manag 2019; 9:17-35. [PMID: 30501556 DOI: 10.2217/pmt-2018-0035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM Glyceryl trinitrate (GTN) provokes an immediate migraine-like headache, followed by a delayed migraine attack in migraineurs. In healthy volunteers, only an immediate, less severe and shorter headache occurs. The presence of an already sensitized nervous system in migraineurs may underlie the more intense and prolonged GTN-evoked headaches. We tested if in healthy humans, application of noxious cutaneous and/or mechanical stimulation within craniofacial region would enhance or prolong GTN-evoked headache. MATERIALS & METHODS Noxious stimuli with a capsaicin patch on forehead, a mechanical headband, or both were applied prior to sublingual GTN (0.5 mg) in 20 healthy volunteers. GTN-induced headache characteristics and sensory responsiveness were recorded. RESULTS A more intense GTN-evoked headache was produced following application of headband. CONCLUSION Noxious mechanical stimulation prior to GTN resulted in a more intense GTN-evoked headache.
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Affiliation(s)
- Parisa Gazerani
- Department of Health Science & Technology, Faculty of Medicine, Aalborg University, Denmark
| | - Brian Edwin Cairns
- Department of Health Science & Technology, Faculty of Medicine, Aalborg University, Denmark.,Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
| | - Hanim Yassin
- Department of Health Science & Technology, Faculty of Medicine, Aalborg University, Denmark
| | - Jasmin Tannaz Yousefi
- Department of Health Science & Technology, Faculty of Medicine, Aalborg University, Denmark
| | - Asiah Rahi Sherzaman
- Department of Health Science & Technology, Faculty of Medicine, Aalborg University, Denmark
| | | | - Søren Kjærgaard Boldsen
- Unit of Clinical Biostatistics and Bioinformatics, Aalborg University Hospital North, Aalborg, Denmark
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Sokolov AY, Sivachenko IB, Panteleev SS, Lyubashina OA. Blockade of 5-HT3 receptors with granisetron does not affect trigeminothalamic nociceptive transmission in rats: Implication for migraine. Clin Exp Pharmacol Physiol 2017; 45:34-41. [PMID: 28853174 DOI: 10.1111/1440-1681.12849] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 06/14/2017] [Accepted: 08/17/2017] [Indexed: 01/12/2023]
Abstract
One way to expand the existing range of anti-migraine drugs seems to be the search for pharmacological agents with anti-cephalalgic properties among medicines approved for clinical indications other than migraine. Numerous experimental and clinical data imply that selective serotonin 5-HT3 receptor antagonists can be considered as potential anti-migraine agents. Therefore, the objective of our work was to examine the impact of selective 5-HT3 receptor blockade with granisetron on migraine-related nociceptive transmission within the spinal trigeminal nucleus (STN) and the ventroposteromedial nucleus of the thalamus (VPM). Using an electrophysiological model of trigemino-durovascular nociception in anaesthetised male Wistar rats, we evaluated the effects of intravenous administration of granisetron on ongoing firing and dural electrical stimulation-evoked responses of the spinal trigeminal and thalamic cells. Granisetron did not substantially affect responses of the STN and VPM neurons to electrical stimulation of the dura mater as well as did not cause steady changes in ongoing firing of the spinal trigeminal cells. The results obtained argue against the use of 5-HT3 receptor antagonists for treating migraine. These data also lead to the conclusion that in the absence of sustained sensitisation of neurons along the trigemino-thalamo-cortical pathway the role of 5-HT3 receptor-dependent mechanisms in serotonergic modulation of trigeminovascular nociceptive transmission can hardly be considered crucial.
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Affiliation(s)
- Alexey Y Sokolov
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First St. Petersburg State Medical University, St. Petersburg, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Ivan B Sivachenko
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Sergey S Panteleev
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First St. Petersburg State Medical University, St. Petersburg, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Olga A Lyubashina
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First St. Petersburg State Medical University, St. Petersburg, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, St. Petersburg, Russia
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4
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Mustafa G, Hou J, Nelson R, Tsuda S, Jahan M, Mohammad NS, Watts JV, Thompson FJ, Bose P. Mild closed head traumatic brain injury-induced changes in monoamine neurotransmitters in the trigeminal subnuclei of a rat model: mechanisms underlying orofacial allodynias and headache. Neural Regen Res 2017; 12:981-986. [PMID: 28761433 PMCID: PMC5514875 DOI: 10.4103/1673-5374.208594] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Our recent findings have demonstrated that rodent models of closed head traumatic brain injury exhibit comprehensive evidence of progressive and enduring orofacial allodynias, a hypersensitive pain response induced by non-painful stimulation. These allodynias, tested using thermal hyperalgesia, correlated with changes in several known pain signaling receptors and molecules along the trigeminal pain pathway, especially in the trigeminal nucleus caudalis. This study focused to extend our previous work to investigate the changes in monoamine neurotransmitter immunoreactivity changes in spinal trigeminal nucleus oralis, pars interpolaris and nucleus tractus solitaries following mild to moderate closed head traumatic brain injury, which are related to tactile allodynia, touch-pressure sensitivity, and visceral pain. Our results exhibited significant alterations in the excitatory monoamine, serotonin, in spinal trigeminal nucleus oralis and pars interpolaris which usually modulate tactile and mechanical sensitivity in addition to the thermal sensitivity. Moreover, we also detected a robust alteration in the expression of serotonin, and inhibitory molecule norepinephrine in the nucleus tractus solitaries, which might indicate the possibility of an alteration in visceral pain, and existence of other morbidities related to solitary nucleus dysfunction in this rodent model of mild to moderate closed head traumatic brain injury. Collectively, widespread changes in monoamine neurotransmitter may be related to orofacial allodynhias and headache after traumatic brain injury.
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Affiliation(s)
- Golam Mustafa
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA.,Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA
| | - Jiamei Hou
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA.,Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA
| | - Rachel Nelson
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA
| | - Shigeharu Tsuda
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA
| | - Mansura Jahan
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA
| | - Naweed S Mohammad
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA
| | - Joseph V Watts
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA
| | - Floyd J Thompson
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA.,Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA.,Department of Neuroscience, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Prodip Bose
- Brain Rehabilitation Research Center of Excellence, Malcom Randall VA Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, FL, USA.,Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA.,Department of Neurology, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
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5
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Melin C, Jacquot F, Vitello N, Dallel R, Artola A. Different processing of meningeal and cutaneous pain information in the spinal trigeminal nucleus caudalis. Cephalalgia 2016; 37:1189-1201. [DOI: 10.1177/0333102416673204] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Introduction Within superficial trigeminal nucleus caudalis (Sp5C) (laminae I/II), meningeal primary afferents project exclusively to lamina I, whereas nociceptive cutaneous ones distribute in both lamina I and outer lamina II. Whether such a relative absence of meningeal inputs to lamina II represents a fundamental difference from cutaneous pathways in the central processing of sensory information is still unknown. Methods We recorded extracellular field potentials in the superficial Sp5C of anesthetised rats evoked by electrically stimulating the dura mater, to selectively assess the synaptic transmission between meningeal primary afferents and second-order Sp5C neurons, the first synapse in trigeminovascular pathways. We tested the effect of systemic morphine and local glycinergic and GABAAergic disinhibition. Results Meningeal stimulation evokes two negative field potentials in superficial Sp5C. The conduction velocities of the activated primary afferents are within the Aδ- and C-fibre ranges. Systemic morphine specifically suppresses meningeal C-fibre-evoked field potentials, and this effect is reversed by systemic naloxone. Segmental glycinergic or GABAAergic disinhibition strongly potentiates meningeal C-fibre-evoked field potentials but not Aδ-fibre ones. Interestingly, the same segmental disinhibition conversely potentiates cutaneous Aδ-fibre-evoked field potentials and suppresses C-fibre ones. Conclusion These findings reveal that the different anatomical organization of meningeal and cutaneous inputs into superficial Sp5C is associated with a different central processing of meningeal and cutaneous pain information within Sp5C. Moreover, they suggest that the potentiation upon local disinhibition of the first synapse in trigeminovascular pathways may contribute to the generation of headache pain.
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Affiliation(s)
- Céline Melin
- Clermont University, University of Auvergne, Clermont-Ferrand, France
- Clermont-Ferrand University Hospital, Department of Odontology, Clermont-Ferrand, France
| | - Florian Jacquot
- Clermont University, University of Auvergne, Clermont-Ferrand, France
| | - Nicolas Vitello
- Clermont University, University of Auvergne, Clermont-Ferrand, France
| | - Radhouane Dallel
- Clermont University, University of Auvergne, Clermont-Ferrand, France
- Clermont-Ferrand University Hospital, Department of Odontology, Clermont-Ferrand, France
| | - Alain Artola
- Clermont University, University of Auvergne, Clermont-Ferrand, France
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Lyubashina OA, Panteleev SS, Sokolov AY. Inhibitory effect of high-frequency greater occipital nerve electrical stimulation on trigeminovascular nociceptive processing in rats. J Neural Transm (Vienna) 2016; 124:171-183. [PMID: 27677650 DOI: 10.1007/s00702-016-1626-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 09/20/2016] [Indexed: 12/19/2022]
Abstract
Electrical stimulation of the greater occipital nerve (GON) has recently shown promise as an effective non-pharmacological prophylactic therapy for drug-resistant chronic primary headaches, but the neurobiological mechanisms underlying its anticephalgic action are not elucidated. Considering that the spinal trigeminal nucleus (STN) is a key segmental structure playing a prominent role in pathophysiology of headaches, in the present study we evaluated the effects of GON electrical stimulation on ongoing and evoked firing of the dura-sensitive STN neurons. The experiments were carried out on urethane/chloralose-anesthetized, paralyzed and artificially ventilated male Wistar rats. Extracellular recordings were made from 11 neurons within the caudal part of the STN that received convergent input from the ipsilateral facial cutaneous receptive fields, dura mater and GON. In each experiment, five various combinations of the GON stimulation frequency (50, 75, 100 Hz) and intensity (1, 3, 6 V) were tested successively in 10 min interval. At all parameter sets, preconditioning GON stimulation (250 ms train of pulses applied before each recording) produced suppression of both the ongoing activity of the STN neurons and their responses to electrical stimulation of the dura mater. The inhibitory effect depended mostly on the GON stimulation intensity, being maximally pronounced when a stimulus of 6 V was applied. Thus, the GON stimulation-induced inhibition of trigeminovascular nociceptive processing at the level of STN has been demonstrated for the first time. The data obtained can contribute to a deeper understanding of neurophysiological mechanisms underlying the therapeutic efficacy of GON stimulation in primary headaches.
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Affiliation(s)
- Olga A Lyubashina
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, Saint Petersburg, 199034, Russia. .,Department of Neuropharmacology, Valdman Institute of Pharmacology, First Saint-Petersburg Pavlov State Medical University, 6/8 Lev Tolstoy Street, Saint Petersburg, 197022, Russia.
| | - Sergey S Panteleev
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, Saint Petersburg, 199034, Russia.,Department of Neuropharmacology, Valdman Institute of Pharmacology, First Saint-Petersburg Pavlov State Medical University, 6/8 Lev Tolstoy Street, Saint Petersburg, 197022, Russia
| | - Alexey Y Sokolov
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, Saint Petersburg, 199034, Russia.,Department of Neuropharmacology, Valdman Institute of Pharmacology, First Saint-Petersburg Pavlov State Medical University, 6/8 Lev Tolstoy Street, Saint Petersburg, 197022, Russia
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7
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Tomic´ MA, Pecikoza UB, Micov AM, Stepanovic´-Petrovic´ RM. The Efficacy of Eslicarbazepine Acetate in Models of Trigeminal, Neuropathic, and Visceral Pain. Anesth Analg 2015; 121:1632-9. [DOI: 10.1213/ane.0000000000000953] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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8
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Sokolov AY, Lyubashina OA, Berkovich RR, Panteleev SS. Intravenous dextromethorphan/quinidine inhibits activity of dura-sensitive spinal trigeminal neurons in rats. Eur J Pain 2014; 19:1086-94. [PMID: 25410439 DOI: 10.1002/ejp.631] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2014] [Indexed: 12/19/2022]
Abstract
BACKGROUND Migraine is a chronic neurological disorder characterized by episodes of throbbing headaches. Practically all medications currently used in migraine prophylaxis have a number of substantial disadvantages and use limitations. Therefore, the further search for principally new prophylactic antimigraine agents remains an important task. The objective of our study was to evaluate the effects of a fixed combination of dextromethorphan hydrobromide and quinidine sulphate (DM/Q) on activity of the spinal trigeminal neurons in an electrophysiological model of trigemino-durovascular nociception. METHODS The study was performed in 15 male Wistar rats, which were anaesthetized with urethane/α-chloralose and paralysed using pipecuronium bromide. The effects of cumulative intravenous infusions of DM/Q (three steps performed 30 min apart, 15/7.5 mg/kg of DM/Q in 0.5 mL of isotonic saline per step) on ongoing and dural electrical stimulation-induced neuronal activities were tested in a group of eight rats over 90 min. Other seven animals received cumulative infusion of equal volumes of saline and served as control. RESULTS Cumulative administration of DM/Q produced steady suppression of both the ongoing activity of the spinal trigeminal neurons and their responses to electrical stimulation of the dura mater. CONCLUSIONS It is evident that the observed DM/Q-induced suppression of trigeminal neuron excitability can lead to a reduction in nociceptive transmission from meninges to higher centres of the brain. Since the same mechanism is believed to underlie the pharmacodynamics of many well-known antimigraine drugs, results of the present study enable us to anticipate the potential efficacy of DM/Q in migraine.
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Affiliation(s)
- A Y Sokolov
- Department of Neuropharmacology, Valdman Institute of Pharmacology, First St. Petersburg Pavlov State Medical University, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, Russia
| | - O A Lyubashina
- Department of Neuropharmacology, Valdman Institute of Pharmacology, First St. Petersburg Pavlov State Medical University, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, Russia
| | - R R Berkovich
- Keck School of Medicine, Department of Neurology, University of Southern California, Los Angeles, USA
| | - S S Panteleev
- Department of Neuropharmacology, Valdman Institute of Pharmacology, First St. Petersburg Pavlov State Medical University, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, Russia
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9
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Sokolov AY, Lyubashina OA, Sivachenko IB, Panteleev SS. Effects of intravenous metamizole on ongoing and evoked activity of dura-sensitive thalamic neurons in rats. Eur J Pharmacol 2014; 731:58-64. [PMID: 24650732 DOI: 10.1016/j.ejphar.2014.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 03/04/2014] [Accepted: 03/10/2014] [Indexed: 01/11/2023]
Abstract
Migraine and tension-type headache (TTH) are the most common forms of primary headaches. A general key mechanism underlying development of both the diseases is the trigeminal system activation associated with the ascending nociceptive transmission via the trigemino-thalamo-cortical pathway. The ventroposteromedial (VPM) nucleus is a key thalamic structure, receiving afferent inflow from the craniofacial region; it holds the third-order neurons responsible for conveying sensory information from the extra- and intracranial nociceptors to the cortex. The VPM is currently seen as a therapeutic target for various antimigraine medications, which is shown to reduce the VPM neuronal excitability. A non-opioid analgesic metamizole is widely used in some countries for acute treatment of migraine or TTH. However, the precise mechanisms underlying anticephalgic action of metamizole remain unclear. The objective of our study performed in the rat model of trigemino-durovascular nociception was to evaluate the effects of intravenously administered metamizole on ongoing and evoked firing of the dura-sensitive VPM neurons. The experiments were carried out on rats under urethane-chloralose anesthesia. Cumulative administration of metamizole (thrice-repeated intravenous infusion of 150 mg/kg performed 30 min apart) in 56% of cases produced a suppression of both the ongoing activity of the thalamic VPM neurons and their responses to dural electrical stimulation. Although the inhibitory effect was prevailing, a number of VPM neurons were indifferent to the administration of metamizole. These data suggest that one of the main components of neural mechanism underlying anticephalgic action of metamizole is suppression of the thalamo-cortical nociceptive transmission associated with trigemino-vascular activation.
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Affiliation(s)
- Alexey Y Sokolov
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, St. Petersburg 199034, Russia; Department of Neuropharmacology, Valdman Institute of Pharmacology, First St. Petersburg Pavlov State Medical University, 6/8 Lev Tolstoy Street, St. Petersburg 197022, Russia.
| | - Olga A Lyubashina
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, St. Petersburg 199034, Russia; Department of Neuropharmacology, Valdman Institute of Pharmacology, First St. Petersburg Pavlov State Medical University, 6/8 Lev Tolstoy Street, St. Petersburg 197022, Russia.
| | - Ivan B Sivachenko
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, St. Petersburg 199034, Russia.
| | - Sergey S Panteleev
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Nab. Makarova, St. Petersburg 199034, Russia; Department of Neuropharmacology, Valdman Institute of Pharmacology, First St. Petersburg Pavlov State Medical University, 6/8 Lev Tolstoy Street, St. Petersburg 197022, Russia.
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10
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Sokolov AY, Lyubashina OA, Sivachenko IB, Berkovich RR, Panteleev SS. Intravenous valproate inhibits ongoing and evoked activity of dura-sensitive thalamic neurons in rats. Eur J Pharmacol 2013; 715:204-11. [PMID: 23732564 DOI: 10.1016/j.ejphar.2013.05.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 05/02/2013] [Accepted: 05/20/2013] [Indexed: 01/24/2023]
Abstract
Valproate is widely used for migraine treatments, although precise mechanisms of its anticephalgic action are poorly understood. Migraine attacks are thought to occur due to trigemino-vascular system activation, which in turn, stimulates nociceptive transmission in trigemino-thalamo-cortical pathway. The ventroposteromedial (VPM) nucleus of the thalamus is considered to play a prominent role in neurobiology of headaches by serving as the highest subcortical relay for conveying nociceptive information from intra- and extra-cranial structures to the cortex. While it has been demonstrated that valproate can modulate trigemino-vascular nociceptive neurotransmission in the VPM, its effects have been investigated using only intrathalamic ejection of the compound in pentobarbitone sodium anesthetized rats. The objective of our study was to evaluate the effects of intravenously administered valproate on both ongoing firing of the VPM neurons and their activity induced by electrical stimulation of the dura mater. The experiments were performed on rats under nonbarbiturate anesthesia. To define the dose-dependent properties and longevity of the studied effects of valproate, two distinguished dosing regiments were used: bolus (single infusion at a dose of 300 mg/kg) and cumulative (thrice-repeated administration of 100mg/kg performed 30 min apart). Intravenous administration of valproate produced the dose-dependent suppression of both the ongoing activity of the thalamic VPM neurons and their responses to electrical stimulation of the dura mater. This effect was fast-developing (within 5 min) and short-lasting (no longer than 30 min). These data suggest that intravenous administration of valproate could produce a reduction of the thalamo-cortical nociceptive transmission associated with trigemino-vascular activation.
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Affiliation(s)
- Alexey Y Sokolov
- Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, 6 Naberezhnaya Makarova, Saint Petersburg 199034, Russia.
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Vagal afferent modulation of spinal trigeminal neuronal responses to dural electrical stimulation in rats. Neuroscience 2012; 222:29-37. [PMID: 22800563 DOI: 10.1016/j.neuroscience.2012.07.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 07/06/2012] [Accepted: 07/06/2012] [Indexed: 11/20/2022]
Abstract
Vagus nerve stimulation (VNS) is an approved antiepileptic and antidepressant treatment, which has recently shown promise as a therapy for drug-resistant primary headaches. Specific neurobiological mechanisms underlying its anticephalgic action are not elucidated, partly because of the deficiency of research-related findings. The spinal trigeminal nucleus (STN) plays a prominent role in pathophysiology of headaches by modulating pain transmission from intracranial structures to higher centers of the brain. To determine whether vagal stimulation may affect trigeminovascular nociception, we investigated the effects of VNS on the STN neuronal activity in the animal model of headache. In anesthetized rats the spike activity of the STN neurons with convergent orofacial and meningeal inputs was monitored, and the changes in neuronal responses to electrical stimulation of the dura mater under preconditioning or under continuous electrical stimulation of the left cervical vagus nerve were studied. Preconditioning vagal afferent stimulation (200-ms train of pulses at 30 Hz applied before each dural stimulus) did not produce substantial changes in the STN spike activity. However, continuous VNS with frequency of 10 Hz in 48% of cases significantly suppressed trigeminal neuronal responses to dural electrical stimulation. In line with the decrease in evoked activity, the VNS-induced depression of ongoing neuronal firing was observed. Although the inhibitory effect was prevailing, 29.5% of STN neurons were facilitated by VNS, whereas 22.5% were unresponsive to the stimulation. These results provide an evidence of VNS-induced modulation of trigeminovascular nociception, and therefore contribute to a deeper understanding of neurophysiological mechanisms underlying effects of vagal stimulation in chronic drug-resistant headaches.
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Comoli E, Das Neves Favaro P, Vautrelle N, Leriche M, Overton PG, Redgrave P. Segregated anatomical input to sub-regions of the rodent superior colliculus associated with approach and defense. Front Neuroanat 2012; 6:9. [PMID: 22514521 PMCID: PMC3324116 DOI: 10.3389/fnana.2012.00009] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Accepted: 03/12/2012] [Indexed: 11/26/2022] Open
Abstract
The superior colliculus (SC) is responsible for sensorimotor transformations required to direct gaze toward or away from unexpected, biologically salient events. Significant changes in the external world are signaled to SC through primary multisensory afferents, spatially organized according to a retinotopic topography. For animals, where an unexpected event could indicate the presence of either predator or prey, early decisions to approach or avoid are particularly important. Rodents’ ecology dictates predators are most often detected initially as movements in upper visual field (mapped in medial SC), while appetitive stimuli are normally found in lower visual field (mapped in lateral SC). Our purpose was to exploit this functional segregation to reveal neural sites that can bias or modulate initial approach or avoidance responses. Small injections of Fluoro-Gold were made into medial or lateral sub-regions of intermediate and deep layers of SC (SCm/SCl). A remarkable segregation of input to these two functionally defined areas was found. (i) There were structures that projected only to SCm (e.g., specific cortical areas, lateral geniculate and suprageniculate thalamic nuclei, ventromedial and premammillary hypothalamic nuclei, and several brainstem areas) or SCl (e.g., primary somatosensory cortex representing upper body parts and vibrissae and parvicellular reticular nucleus in the brainstem). (ii) Other structures projected to both SCm and SCl but from topographically segregated populations of neurons (e.g., zona incerta and substantia nigra pars reticulata). (iii) There were a few brainstem areas in which retrogradely labeled neurons were spatially overlapping (e.g., pedunculopontine nucleus and locus coeruleus). These results indicate significantly more structures across the rat neuraxis are in a position to modulate defense responses evoked from SCm, and that neural mechanisms modulating SC-mediated defense or appetitive behavior are almost entirely segregated.
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Affiliation(s)
- Eliane Comoli
- Laboratory of Functional Neuroanatomy, Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo Ribeirão Preto, Brazil
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