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Sokolov AY, Mengal M, Berkovich R. Menthol dural application alters meningeal arteries tone and enhances excitability of trigeminocervical neurons in rats. Brain Res 2024; 1825:148725. [PMID: 38128811 DOI: 10.1016/j.brainres.2023.148725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/28/2023] [Accepted: 12/13/2023] [Indexed: 12/23/2023]
Abstract
Headaches, including migraines, can have a causal relationship to exposure to cold, and this relationship may be both positive and negative, as cold can both provoke and alleviate cephalgia. The role of thermoreceptors responsible for transduction of low temperatures belongs to the transient receptor potential cation channel subfamily melastatin member 8 (TRPM8). These channels mediate normal cooling sensation and have a role in both cold pain and cooling-mediated analgesia; they are seen as a potential target for principally new anti-migraine pharmaceuticals. Using a validated animal migraine models, we evaluated effects of menthol, the TRPM8-agonist, on trigeminovascular nociception. In acute experiments on male rats, effects of applied durally menthol solution in various concentrations on the neurogenic dural vasodilatation (NDV) and firing rate of dura-sensitive neurons of the trigeminocervical complex (TCC) were assessed. Application of menthol solution in concentrations of 5 % and 10 % was associated with NDV suppression, however amplitude reduction of the dilatation response caused not by the vascular dilatation degree decrease, but rather due to the significant increase of the meningeal arterioles' basal tone. In electrophysiological experiments the 1 % and 30 % menthol solutions intensified TCC neuron responses to the dural electrical stimulation while not changing their background activity. Revealed in our study excitatory effects of menthol related to the vascular as well as neuronal branches of the trigeminovascular system indicate pro-cephalalgic effects of TRPM8-activation and suggest feasibility of further search for new anti-migraine substances among TRPM8-antagonists.
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Affiliation(s)
- Alexey Y Sokolov
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia; Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, Saint Petersburg, Russia; St. Petersburg Medico-Social Institute, Saint Petersburg, Russia.
| | - Miran Mengal
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia
| | - Regina Berkovich
- LAC+USC General Hospital and Neurology Clinic, Regina Berkovich MD, PhD Inc., Los Angeles, CA, USA
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Argyriou AA, Mantovani E, Mitsikostas DD, Vikelis M, Tamburin S. A systematic review with expert opinion on the role of gepants for the preventive and abortive treatment of migraine. Expert Rev Neurother 2022; 22:469-488. [PMID: 35707907 DOI: 10.1080/14737175.2022.2091435] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Gepants are small molecules targeting the calcitonin gene-related peptide (CGRP) that have been recently introduced and are under additional clinical development as preventive and abortive treatment options for migraine. AREAS COVERED After providing a narrative overview of current preventive and acute treatment options for migraine and summarizing the pathophysiology of migraine attack and the role of CGRP, we performed a systematic review, according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) recommendations, on trials on gepants in preventive and acute treatment of migraine. Studies and results were reviewed and discussed, and expert opinion was presented. We also collected data on relevant ongoing trials. EXPERT OPINION Whether direct targeting CGRP pathways within the central nervous system or indirectly modulating them from the peripheral nervous system is more effective and safer in migraine remains still unclear. The available data on the efficacy and safety of gepants suggest they may represent an abortive, and to some extent, preventive treatment option for migraine, in patients who do not respond or have adverse effects to first/second line treatments or at high risk for medication overuse headache; thus opening new therapeutic horizons.
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Affiliation(s)
- Andreas A Argyriou
- Headache Outpatient Clinic, Department of Neurology, 'Agios Andreas' State General Hospital of Patras, Patras, Greece
| | - Elisa Mantovani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Dimos-Dimitrios Mitsikostas
- 1st Department of Neurology, Aeginition Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Stefano Tamburin
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
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Processing of trigeminocervical nociceptive afferent input by neuronal circuity in the upper cervical lamina I. Pain 2021; 163:362-375. [PMID: 33990106 DOI: 10.1097/j.pain.0000000000002342] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/07/2021] [Indexed: 11/27/2022]
Abstract
ABSTRACT Afferents from the C2 spinal nerve (SN) and trigeminal nerve (TN) innervate neighboring cranial territories, and their convergence on the upper cervical dorsal horn neurons represents neural substrate of pain referral in primary headache disorders. Unfortunately, little is known about trigeminocervical input to the major spinal nociceptive projection area lamina I. Here, we used ex vivo brainstem-cervical cord preparation for the visually guided whole-cell recording from the upper cervical lamina I neurons. We show that 50% of them receive convergent monosynaptic input from both nerves, whereas 35% and 11% of neurons receive specific supply from the C2 SN and TN, respectively. Altogether, 10 distinct patterns of synaptic input from the C2 SN and TN to lamina I neurons could be identified. Although stimulation of both nerves evoked excitatory/inhibitory responses, more numerous pure inhibitory inputs arose from the TN. We show that cervical and trigeminal nociceptors converge on to lamina I projection and inhibitory neurons. Thus, trigeminocervical input in lamina I is processed in both nerve-specific and convergent circuitries. Afferent convergence on to inhibitory interneurons serves as a feedforward mechanism balancing excitatory drive to projection neurons. Disruption of this balance may cause pain in primary headache syndromes.
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Sokolov AY, Volynsky MA, Zaytsev VV, Osipchuk AV, Kamshilin AA. Advantages of imaging photoplethysmography for migraine modeling: new optical markers of trigemino-vascular activation in rats. J Headache Pain 2021; 22:18. [PMID: 33794769 PMCID: PMC8015037 DOI: 10.1186/s10194-021-01226-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 03/12/2021] [Indexed: 12/25/2022] Open
Abstract
Background Existent animal models of migraine are not without drawbacks and limitations. The aim of our study was to evaluate imaging photoplethysmography (PPG) as a method of assessing intracranial blood flow in rats and its changes in response to electrical stimulation of dural trigeminal afferents. Methods Experiments were carried out with 32 anesthetized adult male Wistar rats. Trigeminovascular system (TVS) was activated by means of electrical stimulation of dural afferents through a closed cranial window (CCW). Parameters of meningeal blood flow were monitored using a PPG imaging system under green illumination with synchronous recording of an electrocardiogram (ECG) and systemic arterial blood pressure (ABP). Two indicators related to blood-flow parameters were assessed: intrinsic optical signals (OIS) and the amplitude of pulsatile component (APC) of the PPG waveform. Moreover, we carried out pharmacological validation of these indicators by determining their sensitivity to anti-migraine drugs: valproic acid and sumatriptan. For statistical analysis the non-parametric tests with post-hoc Bonferroni correction was used. Results Significant increase of both APC and OIS was observed due to CCW electrical stimulation. Compared to saline (n = 11), intravenous administration of both the sumatriptan (n = 11) and valproate (n = 10) by using a cumulative infusion regimen (three steps performed 30 min apart) lead to significant inhibitory effect on the APC response to the stimulation. In contrast, intravenous infusion of any substance or saline did not affect the OIS response to the stimulation. It was found that infusion of either sumatriptan or valproate did not affect the response of ABP or heart rate to the stimulation. Conclusions Imaging PPG can be used in an animal migraine model as a method for contactless assessment of intracranial blood flow. We have identified two new markers of TVS activation, one of which (APC) was pharmacologically confirmed to be associated with migraine. Monitoring of changes in APC caused by CCW electrical stimulation (controlling efficiency of stimulation by OIS) can be considered as a new way to assess the peripheral mechanism of action of anti-migraine interventions.
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Affiliation(s)
- Alexey Y Sokolov
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia.,Laboratory of Cortico-Visceral Physiology, Pavlov Institute of Physiology of the Russian Academy of Sciences, Saint Petersburg, Russia
| | - Maxim A Volynsky
- Faculty of Applied Optics, ITMO University, Saint Petersburg, Russia
| | - Valery V Zaytsev
- Faculty of Applied Optics, ITMO University, Saint Petersburg, Russia.,Research Laboratory of Neuromodulation, Almazov National Medical Research Centre, Saint Petersburg, Russia
| | - Anastasiia V Osipchuk
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia
| | - Alexei A Kamshilin
- Research Laboratory of Neuromodulation, Almazov National Medical Research Centre, Saint Petersburg, Russia. .,Laboratory of New Functional Materials for Photonics, Institute of Automation and Control, Russian Academy of Sciences, Vladivostok, Russia.
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Urits I, Schwartz R, Smoots D, Koop L, Veeravelli S, Orhurhu V, Cornett EM, Manchikanti L, Kaye AD, Imani F, Varrassi G, Viswanath O. Peripheral Neuromodulation for the Management of Headache. Anesth Pain Med 2020; 10:e110515. [PMID: 34150578 PMCID: PMC8207880 DOI: 10.5812/aapm.110515] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/02/2020] [Accepted: 11/17/2020] [Indexed: 12/18/2022] Open
Abstract
Context Neuromodulation is an expanding field of study for headache treatment to reduce pain by targeting structures within the nervous system that are commonly involved in headache pathophysiology, such as the vagus nerve (VNS), occipital nerves, or sphenopalatine ganglion (SPG) for stimulation. Pharmaceutical medical therapies for abortive and prophylactic treatment, such as triptans, NSAIDs, beta-blockers, TCAs, and antiepileptics, are effective for some individuals, but the role that technology plays in investigating other therapeutic modalities is essential. Peripheral neuromodulation has gained popularity and FDA approval for use in treating certain headaches and migraine headache conditions, particularly in those who are refractory to treatment. Early trials found FDA approved neurostimulatory implant devices, including Cephaly and SpringTMS, improved patient-oriented outcomes with reductions in headaches per month (frequency) and severity. Evidence Acquisition This was a narrative review. The sources for this review are as follows: Searching on PubMed, Google Scholar, Medline, and ScienceDirect from 1990 - 2019 using keywords: Peripheral Neuromodulation, Headache, vagus nerve, occipital nerves, sphenopalatine ganglion. Results The first noninvasive neurostimulator device approved for migraine treatment was the Cefaly device, an external trigeminal nerve stimulation device (e-TNS) that transcutaneously excites the supratrochlear and supraorbital branches of the ophthalmic nerve. The second noninvasive neurostimulation device receiving FDA approval was the single-pulse transcranial magnetic stimulator, SpringTMS, positioned at the occiput to treat migraine with aura. GammaCore is a handheld transcutaneous vagal nerve stimulator applied directly to the neck at home by the patient for treatment of cluster headache (CH) and migraine. Several other devices are in development for the treatment of headaches and target headache evolution at different levels and inputs. The Scion device is a caloric vestibular stimulator (CVS) which interfaces with the user through a set of small cones resting in the ear canal on either side and held in place by modified over-ear headphones. The pulsante SPG Microstimulator is a patient-controlled device implanted in the patient’s upper jaw via an hour-long oral procedure to target the sphenopalatine ganglion. The occipital nerve stimulator (ONS) is an invasive neuromodulation device for headache treatment that consists of an implanted pulse generator on the chest wall connected to a subcutaneous lead with 4 - 8 electrodes that is tunneled the occiput. Conclusions The aim of this review is to provide a comprehensive overview of the efficacy, preliminary outcomes, and limitations of neurostimulatory implants available for use in the US and those pending further development.
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Affiliation(s)
- Ivan Urits
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
- Department of Anesthesiology, LSU Health Shreveport, Shreveport, LA, USA
| | - Ruben Schwartz
- Department of Anesthesiology, Mount Sinai Medical Center, Miami Beach, FL, USA
| | - Daniel Smoots
- Department of Anesthesiology, Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Lindsey Koop
- Department of Anesthesiology, Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Suhitha Veeravelli
- Department of Anesthesia, University of Arizona College of Medicine - Phoenix, Phoenix, AZ, USA
| | - Vwaire Orhurhu
- University of Pittsburgh Medical Center, Williamsport, PA, USA
| | - Elyse M. Cornett
- Department of Anesthesiology, LSU Health Shreveport, Shreveport, LA, USA
- Corresponding Author: Department of Anesthesiology, LSU Health Shreveport, 1501 Kings Highway, Postal Code: 33932, Shreveport, LA, USA.
| | | | - Alan D. Kaye
- Department of Anesthesiology, LSU Health Shreveport, Shreveport, LA, USA
| | - Farnad Imani
- Pain Research Center, Department of Anesthesiology and Pain Medicine, Iran University of Medical Sciences, Tehran, Iran
- Corresponding Author: Pain Research Center, Department of Anesthesiology and Pain Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | | | - Omar Viswanath
- Department of Anesthesiology, LSU Health Shreveport, Shreveport, LA, USA
- Department of Anesthesiology, Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
- Department of Anesthesia, University of Arizona College of Medicine - Phoenix, Phoenix, AZ, USA
- Valley Anesthesiology and Pain Consultants – Envision Physician Services, Phoenix, AZ, USA
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García-Magro N, Negredo P, Martin YB, Nuñez Á, Avendaño C. Modulation of mechanosensory vibrissal responses in the trigeminocervical complex by stimulation of the greater occipital nerve in a rat model of trigeminal neuropathic pain. J Headache Pain 2020; 21:96. [PMID: 32762640 PMCID: PMC7410158 DOI: 10.1186/s10194-020-01161-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 07/17/2020] [Indexed: 12/19/2022] Open
Abstract
Background Stimulation of the occipital or trigeminal nerves has been successfully used to treat chronic refractory neurovascular headaches such as migraine or cluster headache, and painful neuropathies. Convergence of trigeminal and occipital sensory afferents in the ‘trigeminocervical complex’ (TCC) from cutaneous, muscular, dural, and visceral sources is a key mechanism for the input-induced central sensitization that may underlie the altered nociception. Both excitatory (glutamatergic) and inhibitory (GABAergic and glycinergic) mechanisms are involved in modulating nociception in the spinal and medullary dorsal horn neurons, but the mechanisms by which nerve stimulation effects occur are unclear. This study was aimed at investigating the acute effects of electrical stimulation of the greater occipital nerve (GON) on the responses of neurons in the TCC to the mechanical stimulation of the vibrissal pad. Methods Adult male Wistar rats were used. Neuronal recordings were obtained in laminae II-IV in the TCC in control, sham and infraorbital chronic constriction injury (CCI-IoN) animals. The GON was isolated and electrically stimulated. Responses to the stimulation of vibrissae by brief air pulses were analyzed before and after GON stimulation. In order to understand the role of the neurotransmitters involved, specific receptor blockers of NMDA (AP-5), GABAA (bicuculline, Bic) and Glycine (strychnine, Str) were applied locally. Results GON stimulation produced a facilitation of the response to light facial mechanical stimuli in controls, and an inhibition in CCI-IoN cases. AP-5 reduced responses to GON and vibrissal stimulation and blocked the facilitation of GON on vibrissal responses found in controls. The application of Bic or Str significantly reduced the facilitatory effect of GON stimulation on the response to vibrissal stimulation in controls. However, the opposite effect was found when GABAergic or Glycinergic transmission was prevented in CCI-IoN cases. Conclusions GON stimulation modulates the responses of TCC neurons to light mechanical input from the face in opposite directions in controls and under CCI-IoN. This modulation is mediated by GABAergic and Glycinergic mechanisms. These results will help to elucidate the neural mechanisms underlying the effectiveness of nerve stimulation in controlling painful craniofacial disorders, and may be instrumental in identifying new therapeutic targets for their prevention and treatment.
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Affiliation(s)
- Nuria García-Magro
- Department of Anatomy, Histology and Neuroscience, Medical School, Autonoma University of Madrid, c/ Arzobispo Morcillo 2, 28029, Madrid, Spain.,Programme in Neuroscience, Doctoral School, Autonoma University of Madrid, Madrid, Spain
| | - Pilar Negredo
- Department of Anatomy, Histology and Neuroscience, Medical School, Autonoma University of Madrid, c/ Arzobispo Morcillo 2, 28029, Madrid, Spain
| | - Yasmina B Martin
- Facultad de Medicina, Universidad Francisco de Vitoria, 28223, Madrid, Spain
| | - Ángel Nuñez
- Department of Anatomy, Histology and Neuroscience, Medical School, Autonoma University of Madrid, c/ Arzobispo Morcillo 2, 28029, Madrid, Spain
| | - Carlos Avendaño
- Department of Anatomy, Histology and Neuroscience, Medical School, Autonoma University of Madrid, c/ Arzobispo Morcillo 2, 28029, Madrid, Spain.
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Lin T, Gargya A, Singh H, Sivanesan E, Gulati A. Mechanism of Peripheral Nerve Stimulation in Chronic Pain. PAIN MEDICINE (MALDEN, MASS.) 2020; 21:S6-S12. [PMID: 32804230 PMCID: PMC7828608 DOI: 10.1093/pm/pnaa164] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION With the advancement of technology, peripheral nerve stimulation (PNS) has been increasingly used to treat various chronic pain conditions. Its origin is based on the gate control theory postulated by Wall and Melzack in 1965. However, the exact mechanism behind PNS' analgesic effect is largely unknown. In this article, we performed a comprehensive literature review to overview the PNS mechanism of action. DESIGN A comprehensive literature review on the mechanism of PNS in chronic pain. METHODS Comprehensive review of the available literature on the mechanism of PNS in chronic pain. Data were derived from database searches of PubMed, Scopus, and the Cochrane Library and manual searches of bibliographies and known primary or review articles. RESULTS Animal, human, and imaging studies have demonstrated the peripheral and central analgesic mechanisms of PNS by modulating the inflammatory pathways, the autonomic nervous system, the endogenous pain inhibition pathways, and involvement of the cortical and subcortical areas. CONCLUSIONS Peripheral nerve stimulation exhibits its neuromodulatory effect both peripherally and centrally. Further understanding of the mechanism of PNS can help guide stimulation approaches and parameters to optimize the use of PNS.
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Affiliation(s)
- Tiffany Lin
- Department of Anesthesiology, NewYork-Presbyterian/Weill Cornell Medical Center, New York, New York
| | - Akshat Gargya
- Department of Anesthesiology, NewYork-Presbyterian/Weill Cornell Medical Center, New York, New York
| | - Harmandeep Singh
- Department of Anesthesiology, NewYork-Presbyterian/Weill Cornell Medical Center, New York, New York
| | - Eellan Sivanesan
- Department of Anesthesiology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Amitabh Gulati
- Department of Anesthesiology and Critical Care, Memorial Sloan Kettering Cancer Center, New York, USA
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Sokolov AY, Lyubashina OA, Vaganova YS, Amelin AV. [Peripheral neurostimulation in headache treatment]. Zh Nevrol Psikhiatr Im S S Korsakova 2019; 119:79-88. [PMID: 31793548 DOI: 10.17116/jnevro201911910179] [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: 01/11/2023]
Abstract
According to rough estimates, at least one third of the population in developed countries suffers, to varying degrees, from certain forms of primary headache, the modern pharmacotherapy of which is not always effective and has a number of limitations. The non-pharmacological treatment of headache can be an alternative to the prescription of pharmacological agents and the only possible assistance option for patients developing drug-resistant cephalalgias. This review describes various methods of electrical neuromodulation that are used for the management of primary headaches. The authors provide information on current stages in implementation of implantable and non-invasive equipment into clinical practice, which makes possible electrical stimulations of peripheral nerves and of the sphenopalatine ganglion, as well as allows transcranial magnetic stimulation. Also the appearance and usage of portable electrical devices available on the world market are described, and mechanisms that can underlie anticephalgic action of neuromodulation therapy are discussed. Special attention is paid to the methods that are applied for electrostimulation of the vagus nerve and occipital nerves.
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Affiliation(s)
- A Yu Sokolov
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia; Pavlov Institute of Physiology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - O A Lyubashina
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia; Pavlov Institute of Physiology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Yu S Vaganova
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia; Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia
| | - A V Amelin
- Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia
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García-Magro N, Martin YB, Negredo P, Avendaño C. The greater occipital nerve and its spinal and brainstem afferent projections: A stereological and tract-tracing study in the rat. J Comp Neurol 2018; 526:3000-3019. [PMID: 30080243 DOI: 10.1002/cne.24511] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 07/27/2018] [Accepted: 08/02/2018] [Indexed: 12/27/2022]
Abstract
The neuromodulation of the greater occipital nerve (GON) has proved effective to treat chronic refractory neurovascular headaches, in particular migraine and cluster headache. Moreover, animal studies have shown convergence of cervical and trigeminal afferents on the same territories of the upper cervical and lower medullary dorsal horn (DH), the so-called trigeminocervical complex (TCC), and recent studies in rat models of migraine and craniofacial neuropathy have shown that GON block or stimulation alter nociceptive processing in TCC. The present study examines in detail the anatomy of GON and its central projections in the rat applying different tracers to the nerve and quantifying its ultrastructure, the ganglion neurons subserving GON, and their innervation territories in the spinal cord and brainstem. With considerable intersubject variability in size, GON contains on average 900 myelinated and 3,300 unmyelinated axons, more than 90% of which emerge from C2 ganglion neurons. Unmyelinated afferents from GON innervates exclusively laminae I-II of the lateral DH, mostly extending along segments C2-3 . Myelinated fibers distribute mainly in laminae I and III-V of the lateral DH between C1 and C6 and, with different terminal patterns, in medial parts of the DH at upper cervical segments, and ventrolateral rostral cuneate, paratrigeminal, and marginal part of the spinal caudal and interpolar nuclei. Sparse projections also appear in other locations nearby. These findings will help to better understand the bases of sensory convergence on spinomedullary systems, a critical pathophysiological factor for pain referral and spread in severe painful craniofacial disorders.
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Affiliation(s)
- Nuria García-Magro
- Autonoma University of Madrid, Medical School, Department of Anatomy, Histology & Neuroscience, Madrid, Spain
| | - Yasmina B Martin
- Francisco de Vitoria University (UFV), Department of Anatomy, Faculty of Health Sciences, Madrid, Spain
| | - Pilar Negredo
- Autonoma University of Madrid, Medical School, Department of Anatomy, Histology & Neuroscience, Madrid, Spain
| | - Carlos Avendaño
- Autonoma University of Madrid, Medical School, Department of Anatomy, Histology & Neuroscience, Madrid, Spain
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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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