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Paez-Hurtado AM, Calderon-Ospina CA, Nava-Mesa MO. Mechanisms of action of vitamin B1 (thiamine), B6 (pyridoxine), and B12 (cobalamin) in pain: a narrative review. Nutr Neurosci 2023; 26:235-253. [PMID: 35156556 DOI: 10.1080/1028415x.2022.2034242] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Pain is a complex sensory and emotional experience with nociceptive, nociplastic, and neuropathic components. An involvement of neurotropic B vitamins (B1 - thiamine, B6 - pyridoxine, and B12 - cyanocobalamin) as modulators of inflammation and pain has been long discussed. New evidence suggests their therapeutic potential in different pain conditions. In this review, we discuss the main role of neurotropic B vitamins on different nociceptive pathways in the nervous system and to describe their analgesic action mechanisms. The performed literature review showed that, through different mechanisms, these vitamins regulate several inflammatory and neural mediators in nociceptive and neuropathic pain. Some of these processes include aiming the activation of the descending pain modulatory system and in specific intracellular pathways, anti-inflammatory, antioxidative and nerve regenerative effects. Moreover, recent data shows the antinociceptive, antiallodynic, and anti-hyperalgesic effects of the combination of these vitamins, as well as their synergistic effects with known analgesics. Understanding how vitamins B1, B6, and B12 affect several nociceptive mechanisms can therefore be of significance in the treatment of various pain conditions.
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Affiliation(s)
- A M Paez-Hurtado
- Neuroscience Research Group (NEUROS)-Centro Neurovitae, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - C A Calderon-Ospina
- Center for Research in Genetics and Genomics (CIGGUR), GENIUROS Research Group, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - M O Nava-Mesa
- Neuroscience Research Group (NEUROS)-Centro Neurovitae, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
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Jarrell JF, Vilos GA, Allaire C, Burgess S, Fortin C, Gerwin R, Lapensee L, Lea RH, Leyland NA, Martyn P, Shenassa H, Taenzer P. No. 164-Consensus Guidelines for the Management of Chronic Pelvic Pain. JOURNAL OF OBSTETRICS AND GYNAECOLOGY CANADA 2019; 40:e747-e787. [PMID: 30473127 DOI: 10.1016/j.jogc.2018.08.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To improve the understanding of chronic pelvic pain (CPP) and to provide evidence-based guidelines of value to primary care health professionals, general obstetricians and gynaecologists, and those who specialize in chronic pain. BURDEN OF SUFFERING CPP is a common, debilitating condition affecting women. It accounts for substantial personal suffering and health care expenditure for interventions, including multiple consultations and medical and surgical therapies. Because the underlying pathophysiology of this complex condition is poorly understood, these treatments have met with variable success rates. OUTCOMES Effectiveness of diagnostic and therapeutic options, including assessment of myofascial dysfunction, multidisciplinary care, a rehabilitation model that emphasizes achieving higher function with some pain rather than a cure, and appropriate use of opiates for the chronic pain state. EVIDENCE Medline and the Cochrane Database from 1982 to 2004 were searched for articles in English on subjects related to CPP, including acute care management, myofascial dysfunction, and medical and surgical therapeutic options. The committee reviewed the literature and available data from a needs assessment of subjects with CPP, using a consensus approach to develop recommendations. VALUES The quality of the evidence was rated using the criteria described in the Report of the Canadian Task Force on the Periodic Health Examination. Recommendations for practice were ranked according to the method described in that report (Table 1). RECOMMENDATIONS The recommendations are directed to the following areas: (a) an understanding of the needs of women with CPP; (b) general clinical assessment; (c) practical assessment of pain levels; (d) myofascial pain; (e) medications and surgical procedures; (d) principles of opiate management; (f) increased use of magnetic resonance imaging (MRI); (g) documentation of the surgically observed extent of disease; (h) alternative therapies; (i) access to multidisciplinary care models that have components of physical therapy (such as exercise and posture) and psychology (such as cognitive-behavioural therapy), along with other medical disciplines, such as gynaecology and anesthesia; G) increased attention to CPP in the training of health care professionals; and (k) increased attention to CPP in formal, high-calibre research. The committee recommends that provincial ministries of health pursue the creation of multidisciplinary teams to manage the condition.
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Jarrell JF, Vilos GA, Allaire C, Burgess S, Fortin C, Gerwin R, Lapensée L, Lea RH, Leyland NA, Martyn P, Shenassa H, Taenzer P. No 164 - Directive clinique de consensus pour la prise en charge de la douleur pelvienne chronique. JOURNAL OF OBSTETRICS AND GYNAECOLOGY CANADA 2018; 40:e788-e836. [DOI: 10.1016/j.jogc.2018.08.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Laurido C, Hernández A, Pelissier T, Constandil L. Antinociceptive effect of rat D-serine racemase inhibitors, L-serine-O-sulfate, and L-erythro-3-hydroxyaspartate in an arthritic pain model. ScientificWorldJournal 2012; 2012:279147. [PMID: 22536130 PMCID: PMC3317629 DOI: 10.1100/2012/279147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 11/16/2011] [Indexed: 11/25/2022] Open
Abstract
N-methyl-D-aspartic acid receptor (NMDAr) activation requires the presence of D-serine, synthesized from L-serine by a pyridoxal 5′-phosphate-dependent serine racemase (SR). D-serine levels can be lowered by inhibiting the racemization of L-serine. L-serine-O-sulfate (LSOS) and L-erythro-3-hydroxyaspartate (LEHA), among others, have proven to be effective in reducing the D-serine levels in culture cells. It is tempting then to try these compounds in their effectiveness to decrease nociceptive levels in rat arthritic pain. We measured the C-reflex paradigm and wind-up potentiation in the presence of intrathecally injected LSOS (100 μg/10 μL) and LEHA (100 μg/10 μL) in normal and monoarthritic rats. Both compounds decreased the wind-up activity in normal and monoarthritic rats. Accordingly, all the antinociceptive effects were abolished when 300 μg/10 μL of D-serine were injected intrathecally. Since no in vivo results have been presented so far, this constitutes the first evidence that SR inhibitions lower the D-serine levels, thus decreasing the NMDAr activity and the consequent development and maintenance of chronic pain.
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Affiliation(s)
- Claudio Laurido
- Laboratorio de Neurobiología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile.
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Tesser-Viscaíno SA, Denadai-Souza A, Teixeira SA, Ervolino E, Cruz-Rizzolo RJ, Costa SK, Muscará MN, Casatti CA. Putative antinociceptive action of nitric oxide in the caudal part of the spinal trigeminal nucleus during chronic carrageenan-induced arthritis in the rat temporomandibular joint. Brain Res 2009; 1302:85-96. [DOI: 10.1016/j.brainres.2009.09.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Revised: 09/14/2009] [Accepted: 09/14/2009] [Indexed: 12/31/2022]
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Infante C, Díaz M, Hernández A, Constandil L, Pelissier T. Expression of nitric oxide synthase isoforms in the dorsal horn of monoarthritic rats: effects of competitive and uncompetitive N-methyl-D-aspartate antagonists. Arthritis Res Ther 2008; 9:R53. [PMID: 17521446 PMCID: PMC2206346 DOI: 10.1186/ar2208] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2007] [Revised: 04/10/2007] [Accepted: 05/23/2007] [Indexed: 11/29/2022] Open
Abstract
Chronic pain is associated with N-methyl-D-aspartate (NMDA) receptor activation and downstream production of nitric oxide, which has a pivotal role in multisynaptic local circuit nociceptive processing in the spinal cord. The formation of nitric oxide is catalyzed by three major nitric oxide synthase (NOS) isoforms (neuronal, nNOS; inducible, iNOS; endothelial, eNOS), which are increased in the spinal cord of rodents subjected to some tonic and chronic forms of experimental pain. Despite the important role of NOS in spinal cord nociceptive transmission, there have been no studies exploring the effect of NMDA receptor blockade on NOS expression in the dorsal horn during chronic pain. Furthermore, NOS isoforms have not been fully characterized in the dorsal horn of animals subjected to arthritic pain. The aim of this work was therefore to study the expression of nNOS, iNOS and eNOS in the dorsal horns of monoarthritic rats, and the modifications in NOS expression induced by pharmacological blockade of spinal cord NMDA receptors. Monoarthritis was produced by intra-articular injection of complete Freund's adjuvant into the right tibio-tarsal joint. At week 4, monoarthritic rats were given either the competitive NMDA antagonist (±)-3-(2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP) or the uncompetitive NMDA antagonist ketamine. After 6 and 24 hours, animals were killed and posterior quadrants of the lumbar spinal cord were dissected. Sample tissues were homogenized and subjected to immunoblotting with anti-nNOS, anti-iNOS or anti-eNOS monoclonal antibodies. The nNOS isoform, but not the iNOS and eNOS isoforms, were detected in the dorsal horns of control rats. Monoarthritis increased the expression of nNOS, iNOS and eNOS in the dorsal horns ipsilateral and contralateral to the inflamed hindpaw. Intrathecal administration of CPP and ketamine reduced nNOS expression in monoarthritic rats but increased the expression of iNOS and eNOS. Results suggest that blockade of spinal cord NMDA receptors produces complex regulatory changes in the expression of NOS isoforms in monoarthritic rats that may be relevant for nitridergic neuronal/glial mechanisms involved in the pathophysiology of monoarthritis and in the pharmacological response to drugs interacting with NMDA receptors.
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Affiliation(s)
- Claudio Infante
- Program of Physiopathology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Ave. Salvador 486, P.O. Box 16038 Santiago 9, Santiago, Chile
| | - Marcelo Díaz
- Program of Physiopathology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Ave. Salvador 486, P.O. Box 16038 Santiago 9, Santiago, Chile
| | - Alejandro Hernández
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile (USACH), Ave. B. Libertador B. O'Higgins 3363, P.O. Box 40 Correo 33, Santiago, Chile
| | - Luis Constandil
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile (USACH), Ave. B. Libertador B. O'Higgins 3363, P.O. Box 40 Correo 33, Santiago, Chile
| | - Teresa Pelissier
- Program of Molecular and Clinical Pharmacology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Independencia 1027, P.O. Box 70000 Santiago 7, Santiago, Chile
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Pelissier T, Infante C, Constandil L, Espinosa J, Lapeyra CD, Hernández A. Antinociceptive effect and interaction of uncompetitive and competitive NMDA receptor antagonists upon capsaicin and paw pressure testing in normal and monoarthritic rats. Pain 2007; 134:113-27. [PMID: 17517475 DOI: 10.1016/j.pain.2007.04.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2006] [Revised: 01/24/2007] [Accepted: 04/09/2007] [Indexed: 10/23/2022]
Abstract
We assessed whether intrathecal administration of the uncompetitive and competitive NMDA receptor antagonists ketamine and (+/-)CPP, respectively, could produce differential modulation on chemical and mechanical nociception in normal and monoarthritic rats. In addition, the antinociceptive interaction of ketamine and (+/-)CPP on monoarthritic pain was also studied using isobolographic analysis. Monoarthritis was produced by intra-articular injection of complete Freund's adjuvant into the tibio-tarsal joint. Four weeks later, the antinociceptive effect of intrathecal administration of the drugs alone or combined was evaluated by using the intraplantar capsaicin and the paw pressure tests. Ketamine (0.1, 1, 10, 30, 100, 300 and 1000 microg i.t.) and (+/-)CPP (0.125, 2.5, 7.5, 12.5, 25 and 50 microg i.t.) produced significantly greater dose-dependent antinociception in the capsaicin than in the paw pressure test. Irrespective of the nociceptive test employed, both antagonists showed greater antinociceptive activity in monoarthritic than in healthy rats. Combinations produced synergy of a supra-additive nature in the capsaicin test, but only additive antinociception in paw pressure testing. The efficacy of the drugs, alone or combined, is likely to depend on the differential sensitivity of tonic versus phasic pain and/or chemical versus mechanical pain to NMDA antagonists.
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MESH Headings
- Analgesics/pharmacology
- Analgesics/therapeutic use
- Animals
- Arthritis, Experimental/drug therapy
- Arthritis, Experimental/metabolism
- Arthritis, Experimental/physiopathology
- Binding, Competitive
- Capsaicin/toxicity
- Drug Interactions/physiology
- Drug Therapy, Combination
- Excitatory Amino Acid Antagonists/pharmacology
- Excitatory Amino Acid Antagonists/therapeutic use
- Injections, Spinal
- Pain/chemically induced
- Pain/drug therapy
- Pain/metabolism
- Pain Measurement/drug effects
- Pain Measurement/methods
- Physical Stimulation/methods
- Pressure
- Rats
- Rats, Sprague-Dawley
- Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors
- Receptors, N-Methyl-D-Aspartate/metabolism
- Vocalization, Animal/drug effects
- Vocalization, Animal/physiology
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Affiliation(s)
- Teresa Pelissier
- Program of Molecular and Clinical Pharmacology, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, P.O. Box 70,000, Santiago 7, Chile.
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Croci T, Zarini E. Effect of the cannabinoid CB1 receptor antagonist rimonabant on nociceptive responses and adjuvant-induced arthritis in obese and lean rats. Br J Pharmacol 2007; 150:559-66. [PMID: 17245360 PMCID: PMC2189764 DOI: 10.1038/sj.bjp.0707138] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND AND PURPOSE Obesity is a risk factor for several inflammation-based diseases including arthritis. We investigated the anti-nociceptive and anti-inflammatory effects of the cannabinoid CB1 receptor antagonist rimonabant in lean and diet-induced obese female rats with arthritis induced by complete Freund's adjuvant (CFA) injected in the right hind-paw. EXPERIMENTAL APPROACH The effect of oral rimonabant was assessed in rat paws on thermal hyperalgesia, mechanical allodynia, oedema, global arthritis score, nitrite/nitrate levels and ankle widths. KEY RESULTS After 7 but not after 14 days, the inflammatory response to CFA was significantly higher in obese than lean rats; however, the nociceptive response (thermal hyperalgesia and mechanical allodynia) was similar. Oral rimonabant (3 or 10 mg kg-1, once a day for 1 week from day 7 after CFA) only reduced the global arthritic score and joint width in obese rats, with no effect on the paw oedema. It also markedly reduced thermal hyperalgesia and mechanical allodynia in both lean and obese rats, with a greater effect in the latter. CONCLUSION AND IMPLICATIONS Rimonabant appears to be a potent inhibitor of sensorial hypersensitivity associated with CFA-induced arthritis in obese rats, in which the inflammatory reaction is more severe than in lean rats. It may thus have therapeutic potential in obesity-associated inflammatory diseases, particularly in the treatment of the pain associated with arthritis.
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Affiliation(s)
- T Croci
- Research Center Sanofi-Midy, Exploratory Research Department, Sanofi-aventis S.p.A., Milan, Italy.
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Zhang XC, Zhang YQ, Zhao ZQ. Different roles of two nitric oxide activated pathways in spinal long-term potentiation of C-fiber-evoked field potentials. Neuropharmacology 2006; 50:748-54. [PMID: 16427664 DOI: 10.1016/j.neuropharm.2005.11.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2005] [Revised: 11/13/2005] [Accepted: 11/30/2005] [Indexed: 11/30/2022]
Abstract
There is accumulating evidence implicating the involvement of nitric oxide (NO) in spinal central sensitization. The long-term potentiation (LTP) of spinal C-fiber-evoked field potentials is considered as a fundamental mechanism of sensitization of nociceptive neurons in the spinal cord. The present study examined the roles of soluble guanylate cyclase (sGC) or ADP-ribosyltransferase (ADPRT), two potential NO targets, in spinal LTP. The results showed that (1) administration of sGC inhibitors, methyl blue (MB, 4mM, 20 microl) or 1H-[1,2,4]oxadiazolo[4,3-a]-quiloxalin-1-one (ODQ, 10 microM, 20 microl) before tetanic stimulation, significantly inhibited the induction of spinal LTP, and this was reversed by 8-Br-cGMP, a membrane-permeable cGMP analog. However, the maintenance of spinal LTP was not changed when application of ODQ 2h after tetanic stimulation. (2) Although our previous experiments have identified a key role for NO in the induction of spinal LTP, NO synthase (NOS) inhibitor, L-NAME (1mM, 20 microl) or hemoglobin (2mg/ml, 20 microl), a scavenger of NO, had no effect on established spinal LTP when applied 2h after the induction of spinal LTP. (3) The mono-ADPRT inhibitor, nicotinamide (10mM, 20 microl), had no effect on the induction and maintenance of spinal LTP. However, the poly-ADPRT inhibitor, benzamide (100 microM, 20 microl), inhibited its maintenance, but not its induction. The results suggest that NO-stimulated guanylyl cyclase activity plays a critical role in the induction of LTP of C-fiber-evoked field potentials in the spinal cord, whereas NO-related poly-ADPRT activity contributes to the maintenance of spinal LTP.
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Affiliation(s)
- Xi-Chun Zhang
- Institute of Neurobiology, Fudan University, 220 Handan Road, Shanghai 200433, People's Republic of China
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Jarrell JF, Vilos GA, Allaire C, Burgess S, Fortin C, Gerwin R, Lapensée L, Lea RH, Leyland NA, Martyn P, Shenassa H, Taenzer P, Abu-Rafea B. Consensus Guidelines for the Management of Chronic Pelvic Pain. JOURNAL OF OBSTETRICS AND GYNAECOLOGY CANADA 2005; 27:781-826. [PMID: 16287011 DOI: 10.1016/s1701-2163(16)30732-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To improve the understanding of chronic pelvic pain (CPP) and to provide evidence-based guidelines of value to primary care health professionals, general obstetricians and gynaecologists, and those who specialize in chronic pain. BURDEN OF SUFFERING: CPP is a common, debilitating condition affecting women. It accounts for substantial personal suffering and health care expenditure for interventions, including multiple consultations and medical and surgical therapies. Because the underlying pathophysiology of this complex condition is poorly understood, these treatments have met with variable success rates. OUTCOMES Effectiveness of diagnostic and therapeutic options, including assessment of myofascial dysfunction, multidisciplinary care, a rehabilitation model that emphasizes achieving higher function with some pain rather than a cure, and appropriate use of opiates for the chronic pain state. EVIDENCE Medline and the Cochrane Database from 1982 to 2004 were searched for articles in English on subjects related to CPP, including acute care management, myofascial dysfunction, and medical and surgical therapeutic options. The committee reviewed the literature and available data from a needs assessment of subjects with CPP, using a consensus approach to develop recommendations. VALUES The quality of the evidence was rated using the criteria described in the Report of the Canadian Task Force on the Periodic Health Examination. Recommendations for practice were ranked according to the method described in that report (Table 1). RECOMMENDATIONS The recommendations are directed to the following areas: (a) an understanding of the needs of women with CPP; (b) general clinical assessment; (c) practical assessment of pain levels; (d) myofascial pain; (e) medications and surgical procedures; (d) principles of opiate management; (f) increased use of magnetic resonance imaging (MRI); (g) documentation of the surgically observed extent of disease; (h) alternative therapies; (i) access to multidisciplinary care models that have components of physical therapy (such as exercise and posture) and psychology (such as cognitive-behavioural therapy), along with other medical disciplines, such as gynaecology and anesthesia; (j) increased attention to CPP in the training of health care professionals; and (k) increased attention to CPP in formal, high-calibre research. The committee recommends that provincial ministries of health pursue the creation of multidisciplinary teams to manage the condition.
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Zhang XC, Zhang YQ, Zhao ZQ. Involvement of nitric oxide in long-term potentiation of spinal nociceptive responses in rats. Neuroreport 2005; 16:1197-201. [PMID: 16012348 DOI: 10.1097/00001756-200508010-00013] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Nitric oxide plays an important role in spinal nociception. The present study explored the effects of nitric oxide on the spinal long-term potentiation associated with nociception. (1) Nitric oxide synthase inhibitor L-NAME (1 mM, 20 microl) and the nitric oxide scavenger hemoglobin (2 mg/ml, 20 mul) strikingly blocked the induction of tetanic sciatic stimulation-induced spinal long-term potentiation of C-fiber-evoked field potentials. L-arginine, a substrate of nitric oxide synthase, completely reversed L-NAME-induced inhibition. However, D-NAME (1 mM, 20 microl), an inactive form of L-NAME, had little effect on the spinal LTP. (2) The same tetanic sciatic stimulation induced long-term thermal hyperalgesia, which was blocked by pre-application of L-NAME. These results suggest the involvement of nitric oxide in the spinal long-term potentiation of C-fiber-evoked field potentials and related behavior changes.
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Affiliation(s)
- Xi-Chun Zhang
- Institute of Neurobiology, Fudan University, 220 Handan Road, Shanghai 200433, People's Republic of China
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Necker R. Embryonic development of choline acetyltransferase and nitric oxide synthase in the spinal cord of pigeons and chickens with special reference to the superficial dorsal horn. ACTA ACUST UNITED AC 2005; 210:145-54. [PMID: 16044318 DOI: 10.1007/s00429-005-0018-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/24/2005] [Indexed: 12/18/2022]
Abstract
The superficial dorsal horn of birds as well as mammals contains both cholinergic and nitrergic neuronal structures as evident from the presence of the synthesizing enzymes such as choline acetyltransferase and nitric oxide synthase, which is an NADPH diaphorase. In the rat, both systems develop only postnatally. Rats are altricial at birth whereas pigeons and chickens are semiprecocial or precocial, respectively, at the time of hatching. Immunocytochemical studies of choline acetyltransferase and nitric oxide synthase in the developing avian spinal cord (starting with embryonic day 12 of 18 in the pigeon and 14 of 21 in the chicken) showed that both systems are well developed in the superficial dorsal horn at the time of hatching in both avian species. In the pigeon, choline acetyltransferase-positive superficial dorsal horn neurons appear only on the day of hatching (E18), whereas nitric oxide synthase-positive neurons can be first detected at stage E14. In the chicken, nitric oxide synthase-positive neurons are present already at stage E14, whereas choline acetyltransferase-positive neurons appear at stage E20. Autonomic and somatic motor neurons show adult-like choline acetyltransferase-immunoreactivity and/or nitric oxide synthase-immunoreactivity at the earliest stages investigated. It is concluded that the stage of maturation at birth or hatching plays an important role in the development of superficial dorsal horn cholinergic and nitrergic systems.
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Affiliation(s)
- R Necker
- Lehrstuhl für Tierphysiologie, Ruhr-Universität Bochum, 44780, Bochum, Germany.
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Condés-Lara M, Maie IAS, Dickenson AH. Oxytocin actions on afferent evoked spinal cord neuronal activities in neuropathic but not in normal rats. Brain Res 2005; 1045:124-33. [PMID: 15910770 DOI: 10.1016/j.brainres.2005.03.020] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Revised: 03/04/2005] [Accepted: 03/15/2005] [Indexed: 01/28/2023]
Abstract
A hypothalamic oxytocinergic-descending pathway that reaches the dorsal horn of the spinal cord has been well documented and recently related to states of pain and analgesia. In order to study the action of the neuropeptide oxytocin (OT) on pain-related responses, we compared dorsal horn neuronal responses to electrical and mechanical stimulation of receptive fields in normal and neuropathic rats. Spinal nerve (L5 and L6) ligation (Chung rats) was used to produce experimental neuropathy. Single unit activity was recorded at the L4-L5 level from neurons identified as wide dynamic range presenting latency responses corresponding to A-beta, A-delta, C fibers and also exhibiting post-discharge, and wind-up. We tested intrathecally applied doses of 0.05, 0.1, 1, 2, 5, 10 I.U. of OT. Minor effects on responses to electrical stimulation were present in normal rats. Mechanical responses evoked by von Frey filaments were slightly reduced in normal animals. In neuropathic rats a dose of 1 I.U. produced a significant reduction in C-fibers and post-discharge activities, and doses of 2 I.U. caused a further, pronounced reduction in post-discharge, wind-up, and input values. However, the most marked change was the post-discharge reduction at 10 and 20 min after OT administration. Mechanical responses were significantly reduced in terms of their discharge rate response in neuropathic rats. The contrasting results obtained in normal and neuropathic rats revealed an important distinction between these animals and indicate that plastic changes occur as a consequence of nerve damage. In neuropathic rats, mechanisms involving ascending noxious information to the paraventricular nuclei and descending OT activities could be altered so sensitizing the OT receptors of the spinal dorsal horn cells and could explain our observations. Our results point out an anti-algesic OT effect in neuropathic rats.
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Affiliation(s)
- Miguel Condés-Lara
- Departamento de Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus UNAM-Juriquilla, México.
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