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Aguiar DD, da Costa Oliveira C, Fonseca FCS, de Almeida DL, Campos Pereira WV, Guimarães FS, Perez AC, Duarte IDG, Romero TRL. Peripherally injected canabidiol reduces neuropathic pain in mice: Role of the 5-HT 1A and TRPV1 receptors. Biochem Biophys Res Commun 2023; 660:58-64. [PMID: 37068389 DOI: 10.1016/j.bbrc.2023.04.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 04/10/2023] [Indexed: 04/19/2023]
Abstract
Cannabidiol (CBD) is the most abundant non-psychoactive component found in plants of the genus Cannabis. Its analgesic effect for the treatment of neuropathy has been widely studied. However, little is known about its effects in the acute treatment when Cannabidiol is administered peripherally. Because of that, this research was aimed to evaluate the antinociceptive effects of the CBD when administered peripherally for the treatment of acute neuropathic pain and check the involvement of the 5-HT1A and the TRPV1 receptors in this event. Neuropathic pain was induced with the constriction of the sciatic nerve while the nociceptive threshold was measured using the pressure test of the mouse paw. The technique used proved to be efficient to induce neuropathy, and the CBD (5, 10 and 30 μg/paw) induced the antinociception in a dosage-dependent manner. The dosage used that induced a more potent effect (30 μg/paw), did not induce a systemic response, as demonstrated by both the motor coordination assessment test (RotaRod) and the antinociceptive effect restricted to the paw treated with CBD. The administration of NAN-190 (10 μg/paw), a selective 5-HT1A receptor antagonist, and SB-366791 (16 μg/paw), a selective TRPV1 antagonist, partially reversed the CBD-induced antinociception. The results of the research suggest that the CBD produces the peripheral antinociception during the acute treatment of the neuropathic pain and it partially involved the participation of the 5-HT1A and TRPV1 receptors.
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Affiliation(s)
- Danielle Diniz Aguiar
- Department of Pharmacology, Institute of Biological Sciences, UFMG, Belo Horizonte, MG, Brazil
| | | | | | | | | | | | - Andrea Castro Perez
- Department of Pharmacology, Institute of Biological Sciences, UFMG, Belo Horizonte, MG, Brazil
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Prasad KV, Sathish M, Prabakaran A, Basha SJ, Santhamma C, Vetrivelan V, Devi RN, Irfan A, Muthu S. Vibrational energies, bonding nature, electronic properties, spectroscopic investigations and analysis of 3-bromo-4-Chlorobenzophenone. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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3
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Okumura T, Ishioh M, Nozu T. Central regulatory mechanisms of visceral sensation in response to colonic distension with special reference to brain orexin. Neuropeptides 2021; 86:102129. [PMID: 33636498 DOI: 10.1016/j.npep.2021.102129] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 01/08/2021] [Accepted: 02/09/2021] [Indexed: 01/22/2023]
Abstract
Visceral hypersensitivity is a major pathophysiology in irritable bowel syndrome (IBS). Although brain-gut interaction is considered to be involved in the regulation of visceral sensation, little had been known how brain controls visceral sensation. To improve therapeutic strategy in IBS, we should develop a novel approach to control visceral hypersensitivity. Here, we summarized recent data on central control of visceral sensation by neuropeptides in rats. Orexin, ghrelin or oxytocin in the brain is capable of inducing visceral antinociception. Dopamine, cannabinoid, adenosine, serotonin or opioid in the central nervous system (CNS) plays a role in the visceral hyposensitivity. Central ghrelin, levodopa or morphine could induce visceral antinociception via the orexinergic signaling. Orexin induces visceral antinociception through dopamine, cannabinoid, adenosine or oxytocin. Orexin nerve fibers are identified widely throughout the CNS and orexins are implicated in a number of functions. With regard to gastrointestinal functions, in addition to its visceral antinociception, orexin acts centrally to stimulate gastrointestinal motility and improve intestinal barrier function. Brain orexin is also involved in regulation of sleep/awake cycle and anti-depressive action. From these evidence, we would like to make a hypothesis that decreased orexin signaling in the brain may play a role in the pathophysiology in a part of patients with IBS who are frequently accompanied with sleep disturbance, depressive state and disturbed gut functions such as gut motility disturbance, leaky gut and visceral hypersensitivity.
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Affiliation(s)
- Toshikatsu Okumura
- Division of Metabolism, Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Japan.
| | - Masatomo Ishioh
- Division of Metabolism, Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Japan
| | - Tsukasa Nozu
- Department of Regional Medicine and Education, Asahikawa Medical University, Japan
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Khalilzadeh M, Hassanzadeh F, Aghamiri H, Dehpour AR, Shafaroodi H. Aripiprazole prevents from development of vincristine-induced neuropathic nociception by limiting neural NOS overexpression and NF-kB hyperactivation. Cancer Chemother Pharmacol 2020; 86:393-404. [PMID: 32803467 DOI: 10.1007/s00280-020-04127-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 08/10/2020] [Indexed: 12/16/2022]
Abstract
PURPOSE Increased nitric oxide (NO) synthesis and NF-kB activation have been shown as critical players in the pathophysiology of vincristine-induced peripheral neuropathy. Consistently, neural nitric oxide synthase (nNOS) inhibitors alleviated the neuropathic pain. Previous studies demonstrated that aripiprazole is capable of modulating NO synthesis and also has been reported its modulatory effect on NF-kB activity. METHODS Aripiprazole was administered daily to the male Wistar rats at the same time with establishing neuropathic model by I.P. injection of vincristine every 2 days, over 2 weeks. Efficacy of aripiprazole in suppressing the development of neuropathy was evaluated by assessing changes in body weight, mechanical threshold, withdrawal latency, sciatic nerve conduction velocity (SNCV), and compound motor action potential (CMAP) characteristics. Expression of nNOS and NF-kB activation were evaluated by western blotting RESULTS: Rats receiving aripiprazole during neuropathy establishment period demonstrated a normal weight gain pattern, a significantly higher mechanical withdrawal threshold, and SNCV compared to vincristine-treated group. Furthermore, the amplitude and area of CMAP were significantly higher in aripiprazole group. Western blotting demonstrated a significantly reduced expression of nNOS and NF-kB activation in dorsal root ganglia of aripiprazole co-treated rats. CONCLUSION In conclusion, aripiprazole effectively prevents from vincristine-induced neuropathy by limiting nNOS overexpression and NF-kB hyperactivation.
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Affiliation(s)
- Mina Khalilzadeh
- Brain and Spinal Cord Injury Research Center, Neuroscience Institute Tehran University of Medical Sciences, Tehran, Iran
| | - Fereshteh Hassanzadeh
- Brain and Spinal Cord Injury Research Center, Neuroscience Institute Tehran University of Medical Sciences, Tehran, Iran
| | - Helia Aghamiri
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Ahmad Reza Dehpour
- Brain and Spinal Cord Injury Research Center, Neuroscience Institute Tehran University of Medical Sciences, Tehran, Iran.,Experimental Medicine Research Center, Tehran University of Medical Sciences, P.O. Box 13145-784, Tehran, Iran
| | - Hamed Shafaroodi
- Experimental Medicine Research Center, Tehran University of Medical Sciences, P.O. Box 13145-784, Tehran, Iran. .,Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, P.O. Box 13145-784, Tehran, Iran.
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Adenosine A1 receptor agonist induces visceral antinociception via 5-HT1A, 5-HT2A, dopamine D1 or cannabinoid CB1 receptors, and the opioid system in the central nervous system. Physiol Behav 2020; 220:112881. [DOI: 10.1016/j.physbeh.2020.112881] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 03/17/2020] [Accepted: 03/17/2020] [Indexed: 02/08/2023]
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5-HT2A receptors but not cannabinoid receptors in the central nervous system mediate levodopa-induced visceral antinociception in conscious rats. Naunyn Schmiedebergs Arch Pharmacol 2020; 393:1419-1425. [DOI: 10.1007/s00210-020-01842-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 02/14/2020] [Indexed: 12/12/2022]
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Mata-Bermudez A, Izquierdo T, de Los Monteros-Zuñiga E, Coen A, Godínez-Chaparro B. Antiallodynic effect induced by [6]-gingerol in neuropathic rats is mediated by activation of the serotoninergic system and the nitric oxide-cyclic guanosine monophosphate-adenosine triphosphate-sensitive K + channel pathway. Phytother Res 2018; 32:2520-2530. [PMID: 30251306 DOI: 10.1002/ptr.6191] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 08/11/2018] [Accepted: 08/16/2018] [Indexed: 01/02/2023]
Abstract
The present study evaluated the possible antiallodynic effect induced by [6]-gingerol in rats with L5-L6 spinal nerve ligation (SNL). Moreover, we determined the possible mechanism underlying the antiallodynic effect induced by [6]-gingerol in neuropathic rats. The animals underwent L5-L6 SNL for the purpose of developing tactile allodynia. Tactile allodynia was measured with von Frey filaments. Intrathecal administration of [6]-gingerol reversed SNL-induced tactile allodynia. The [6]-gingerol-induced antiallodynic effect was prevented by the intrathecal administration of methiothepin (30 μg per rat; nonselective 5-hydroxytryptamine [5-HT] antagonist), WAY-100635 (6 μg per rat; selective 5-HT1A receptor antagonist), SB-224289 (5 μg per rat; selective 5-HT1B receptor antagonist), BRL-15572 (4 μg per rat; selective 5-HT1D receptor antagonist), and SB-659551 (6 μg per rat; selective 5-HT5A receptor antagonist), but naloxone (50 μg per rat; nonselective opioid receptor antagonist) did not prevent the [6]-gingerol-induced antiallodynic effect. Moreover, intrathecal administration of Nω-nitro-l-arginine methyl ester (100 μg per rat; nonselective nitric oxide [NO] synthase inhibitor), 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (10 μg per rat; inhibitor of guanylate cyclase), and glibenclamide (50 μg per rat; channel blocker of adenosine triphosphate [ATP]-sensitive K+ channels) prevented the [6]-gingerol-induced antiallodynic effect. These data suggest that the antiallodynic effect induced by [6]-gingerol is mediated by the serotoninergic system involving the activation of 5-HT1A/1B/1D/5A receptors, as well as the NO-cyclic guanosine monophosphate-ATP-sensitive K+ channel pathway but not by the opioidergic system.
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Affiliation(s)
- Alfonso Mata-Bermudez
- Departamento de Sistemas Biológicos, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, Mexico City, Mexico
| | - Teresa Izquierdo
- Departamento de Sistemas Biológicos, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, Mexico City, Mexico
| | - Espinosa de Los Monteros-Zuñiga
- Departamento de Sistemas Biológicos, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, Mexico City, Mexico
| | - Arrigo Coen
- Departamento de Matemáticas, Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Mexico City, Mexico
| | - Beatriz Godínez-Chaparro
- Departamento de Sistemas Biológicos, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, Mexico City, Mexico
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Newman-Tancredi A, Depoortère R, Carilla-Durand E, Tarayre J, Kleven M, Koek W, Bardin L, Varney M. NLX-112, a highly selective 5-HT1A receptor agonist: Effects on body temperature and plasma corticosterone levels in rats. Pharmacol Biochem Behav 2018; 165:56-62. [DOI: 10.1016/j.pbb.2017.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 10/05/2017] [Accepted: 11/06/2017] [Indexed: 12/27/2022]
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10
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Sałat K, Kołaczkowski M, Furgała A, Rojek A, Śniecikowska J, Varney MA, Newman-Tancredi A. Antinociceptive, antiallodynic and antihyperalgesic effects of the 5-HT 1A receptor selective agonist, NLX-112 in mouse models of pain. Neuropharmacology 2017; 125:181-188. [PMID: 28751195 DOI: 10.1016/j.neuropharm.2017.07.022] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 06/11/2017] [Accepted: 07/22/2017] [Indexed: 01/02/2023]
Abstract
BACKGROUND AND PURPOSE NLX-112 (a.k.a. befiradol, F13640) is a drug candidate intended for the treatment of l-DOPA-induced dyskinesia. It is a highly selective serotonin 5-HT1A receptor full agonist which has been previously tested in a variety of models of CNS effects including analgesic activity in rat. Its activity in mouse models of pain has not been previously investigated. EXPERIMENTAL APPROACH The activity of NLX-112 was tested in mouse models of acute pain (hot plate), tonic pain (intraplantar formalin test), in the oxaliplatin-induced neuropathic pain model of chemotherapy-induced peripheral neuropathy and in the streptozotocin (STZ)-induced model of painful diabetic neuropathy. KEY RESULTS The main findings indicate that (i) NLX-112 was markedly active in the formalin test with potent reduction of paw licking in both phases of the test (minimal effective dose (MED) 0.5 mg/kg i.p. and p.o. in acute phase, and 0.1 mg/kg i.p. and 1 mg/kg p.o. in late phase). The effects of NLX-112 in this test were completely abolished by the selective 5-HT1A receptor antagonist, WAY100635; (ii) NLX-112 was active in the hot plate test and in the oxaliplatin-induced neuropathic pain model of chemotherapy-induced peripheral neuropathy, but at markedly higher doses (MED 2.5 mg/kg i.p.); (iii) NLX-112 was least active in the STZ-induced model of painful diabetic neuropathy (MED 5 mg/kg i.p.); (iv) NLX-112 did not affect locomotor activity. CONCLUSIONS AND IMPLICATIONS NLX-112 may have significant potential for treatment of tonic pain but may be less promising as a candidate for treatment of chemotherapy-induced or diabetic neuropathic pain.
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Affiliation(s)
- Kinga Sałat
- Chair of Pharmacodynamics, Jagiellonian University, Medical College, Medyczna 9 St., 30-688 Krakow, Poland.
| | - Marcin Kołaczkowski
- Chair of Pharmaceutical Chemistry, Jagiellonian University, Medical College, Medyczna 9 St., 30-688 Krakow, Poland
| | - Anna Furgała
- Chair of Pharmacodynamics, Jagiellonian University, Medical College, Medyczna 9 St., 30-688 Krakow, Poland
| | - Adriana Rojek
- Chair of Pharmacodynamics, Jagiellonian University, Medical College, Medyczna 9 St., 30-688 Krakow, Poland
| | - Joanna Śniecikowska
- Chair of Pharmaceutical Chemistry, Jagiellonian University, Medical College, Medyczna 9 St., 30-688 Krakow, Poland
| | - Mark A Varney
- Neurolixis Inc., 34145 Pacific Coast Highway #504, Dana Point, CA 92629, USA
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McCreary AC, Varney MA, Newman-Tancredi A. The novel 5-HT 1A receptor agonist, NLX-112 reduces l -DOPA-induced abnormal involuntary movements in rat: A chronic administration study with microdialysis measurements. Neuropharmacology 2016; 105:651-660. [DOI: 10.1016/j.neuropharm.2016.01.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 01/06/2016] [Accepted: 01/07/2016] [Indexed: 01/20/2023]
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Avila-Rojas SH, Velázquez-Lagunas I, Salinas-Abarca AB, Barragán-Iglesias P, Pineda-Farias JB, Granados-Soto V. Role of spinal 5-HT5A, and 5-HT1A/1B/1D, receptors in neuropathic pain induced by spinal nerve ligation in rats. Brain Res 2015; 1622:377-85. [PMID: 26168890 DOI: 10.1016/j.brainres.2015.06.043] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 06/25/2015] [Accepted: 06/28/2015] [Indexed: 11/15/2022]
Abstract
Serotonin (5-HT) participates in pain modulation by interacting with different 5-HT receptors. The role of 5-HT5A receptor in neuropathic pain has not previously studied. The purpose of this study was to investigate: A) the role of 5-HT5A receptors in rats subjected to spinal nerve injury; B) the expression of 5-HT5A receptors in dorsal spinal cord and dorsal root ganglia (DRG). Neuropathic pain was induced by L5/L6 spinal nerve ligation. Tactile allodynia in neuropathic rats was assessed with von Frey filaments. Western blot methodology was used to determine 5-HT5A receptor protein expression. Intrathecal administration (on day 14th) of 5-HT (10-100 nmol) or 5-carboxamidotryptamine (5-CT, 0.03-0.3 nmol) reversed nerve injury-induced tactile allodynia. Intrathecal non-selective (methiothepin, 0.1-0.8 nmol) and selective (SB-699551, 1-10 nmol) 5-HT5A receptor antagonists reduced, by ~60% and ~25%, respectively, the antiallodynic effect of 5-HT (100 nmol) or 5-CT (0.3 nmol). Moreover, both selective 5-HT1A and 5-HT1B/1D receptor antagonists, WAY-100635 (0.3-1 nmol) and GR-127935 (0.3-1 nmol), respectively, partially diminished the antiallodynic effect of 5-HT or 5-CT by about 30%. Injection of antagonists, by themselves, did not affect allodynia. 5-HT5A receptors were expressed in the ipsilateral dorsal lumbar spinal cord and DRG and L5/L6 spinal nerve ligation did not modify 5-HT5A receptor protein expression in those sites. Results suggest that 5-HT5A receptors reduce pain processing in the spinal cord and that 5-HT and 5-CT reduce neuropathic pain through activation of 5-HT5A and 5-HT1A/1B/1D receptors. These receptors could be an important part of the descending pain inhibitory system.
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MESH Headings
- Analgesics/pharmacology
- Animals
- Dose-Response Relationship, Drug
- Female
- Ganglia, Spinal/drug effects
- Ganglia, Spinal/metabolism
- Hyperalgesia/drug therapy
- Hyperalgesia/metabolism
- Lumbar Vertebrae
- Methiothepin/pharmacology
- Neuralgia/drug therapy
- Neuralgia/metabolism
- Oxadiazoles/pharmacology
- Piperazines/pharmacology
- Pyridines/pharmacology
- Rats, Wistar
- Receptor, Serotonin, 5-HT1A/metabolism
- Receptor, Serotonin, 5-HT1B/metabolism
- Receptor, Serotonin, 5-HT1D/metabolism
- Receptors, Serotonin/metabolism
- Receptors, Serotonin, 5-HT1/metabolism
- Serotonin/analogs & derivatives
- Serotonin/pharmacology
- Serotonin Antagonists/pharmacology
- Serotonin Receptor Agonists/pharmacology
- Spinal Cord/drug effects
- Spinal Cord/metabolism
- Spinal Nerves/injuries
- Touch
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Affiliation(s)
- Sabino Hazael Avila-Rojas
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados (Cinvestav), Sede Sur. Calzada de los Tenorios 235, Col. Granjas Coapa, 14330 México, D.F., Mexico
| | - Isabel Velázquez-Lagunas
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados (Cinvestav), Sede Sur. Calzada de los Tenorios 235, Col. Granjas Coapa, 14330 México, D.F., Mexico
| | - Ana Belen Salinas-Abarca
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados (Cinvestav), Sede Sur. Calzada de los Tenorios 235, Col. Granjas Coapa, 14330 México, D.F., Mexico
| | - Paulino Barragán-Iglesias
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados (Cinvestav), Sede Sur. Calzada de los Tenorios 235, Col. Granjas Coapa, 14330 México, D.F., Mexico
| | - Jorge Baruch Pineda-Farias
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados (Cinvestav), Sede Sur. Calzada de los Tenorios 235, Col. Granjas Coapa, 14330 México, D.F., Mexico
| | - Vinicio Granados-Soto
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados (Cinvestav), Sede Sur. Calzada de los Tenorios 235, Col. Granjas Coapa, 14330 México, D.F., Mexico.
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Murai N, Takeshita N, Nishigaki F, Irie M, Tamura S, Aoki T, Matsuoka N. AS1069562, the (+)-isomer of indeloxazine, exerts analgesic effects in rat models of nociceptive pain. Neurol Res 2015; 37:525-30. [DOI: 10.1179/1743132815y.0000000007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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14
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Cornide-Petronio ME, Fernández-López B, Barreiro-Iglesias A, Rodicio MC. Traumatic injury induces changes in the expression of the serotonin 1A receptor in the spinal cord of lampreys. Neuropharmacology 2014; 77:369-78. [PMID: 24490228 DOI: 10.1016/j.neuropharm.2013.10.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
After spinal cord injury (SCI) in mammals, the loss of serotonin coming from the brainstem reduces the excitability of motor neurons and leads to a compensatory overexpression of serotonin receptors. Despite the key role of the serotonin receptor 1a in the control of locomotion, little attention has been put in the study of this receptor after SCI. In contrast to mammals, lampreys recover locomotion after a complete SCI, so, studies in this specie could help to understand events that lead to recovery of function. Here, we showed that in lampreys there is an acute increase in the expression of the serotonin 1A receptor transcript (5-ht1a) after SCI and a few weeks later expression levels go back to normal rostrally and caudally to the lesion. Overexpression of the 5-ht1a in rostral levels after SCI has not been reported in mammals, suggesting that this could be part of the plastic events that lead to the recovery of function in lampreys. The analysis of changes in 5-ht1a expression by zones (periventricular region and horizontally extended grey matter) showed that they followed the same pattern of changes detected in the spinal cord as a whole, with the exception of the caudal periventricular layer, where no significant differences were observed between control and experimental animals at any time post lesion. This suggests that different molecular signals act on the periventricular cells of the rostral and caudal regions to injury site and thus affecting their response to the injury in terms of expression of the 5-ht1a.
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Abstract
Homeostasis, the dominant explanatory framework for physiological regulation, has undergone significant revision in recent years, with contemporary models differing significantly from the original formulation. Allostasis, an alternative view of physiological regulation, goes beyond its homeostatic roots, offering novel insights relevant to our understanding and treatment of several chronic health conditions. Despite growing enthusiasm for allostasis, the concept remains diffuse, due in part to ambiguity as to how the term is understood and used, impeding meaningful translational and clinical research on allostasis. Here, we provide a more focused understanding of homeostasis and allostasis by explaining how both play a role in physiological regulation, and a critical analysis of regulation suggests how homeostasis and allostasis can be distinguished. Rather than focusing on changes in the value of a regulated variable (e.g., body temperature, body adiposity, or reward), research investigating the activity and relationship among the multiple regulatory loops that influence the value of these regulated variables may be the key to distinguishing homeostasis and allostasis. The mechanisms underlying physiological regulation and dysregulation are likely to have important implications for health and disease.
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Affiliation(s)
- Douglas S. Ramsay
- Department of Oral Health Sciences, University of Washington, Seattle, Washington, USA
- Department of Orthodontics, University of Washington, Seattle, Washington, USA
- Department of Pediatric Dentistry, University of Washington, Seattle, Washington, USA
| | - Stephen C. Woods
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati Medical Center, Cincinnati, Ohio, USA
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16
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AS1069562, the (+)-isomer of indeloxazine, but not duloxetine has a curative-like analgesic effect in a rat model of streptozotocin-induced diabetic neuropathy. Neuropharmacology 2014; 79:10-6. [DOI: 10.1016/j.neuropharm.2013.10.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 09/25/2013] [Accepted: 10/27/2013] [Indexed: 02/06/2023]
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17
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M'Dahoma S, Bourgoin S, Kayser V, Barthélémy S, Chevarin C, Chali F, Orsal D, Hamon M. Spinal cord transection-induced allodynia in rats--behavioral, physiopathological and pharmacological characterization. PLoS One 2014; 9:e102027. [PMID: 25019623 PMCID: PMC4096923 DOI: 10.1371/journal.pone.0102027] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 06/14/2014] [Indexed: 12/31/2022] Open
Abstract
In humans, spinal cord lesions induce not only major motor and neurovegetative deficits but also severe neuropathic pain which is mostly resistant to classical analgesics. Better treatments can be expected from precise characterization of underlying physiopathological mechanisms. This led us to thoroughly investigate (i) mechanical and thermal sensory alterations, (ii) responses to acute treatments with drugs having patent or potential anti-allodynic properties and (iii) the spinal/ganglion expression of transcripts encoding markers of neuronal injury, microglia and astrocyte activation in rats that underwent complete spinal cord transection (SCT). SCT was performed at thoracic T8-T9 level under deep isoflurane anaesthesia, and SCT rats were examined for up to two months post surgery. SCT induced a marked hyper-reflexia at hindpaws and strong mechanical and cold allodynia in a limited (6 cm2) cutaneous territory just rostral to the lesion site. At this level, pressure threshold value to trigger nocifensive reactions to locally applied von Frey filaments was 100-fold lower in SCT- versus sham-operated rats. A marked up-regulation of mRNAs encoding ATF3 (neuronal injury) and glial activation markers (OX-42, GFAP, P2×4, P2×7, TLR4) was observed in spinal cord and/or dorsal root ganglia at T6-T11 levels from day 2 up to day 60 post surgery. Transcripts encoding the proinflammatory cytokines IL-1β, IL-6 and TNF-α were also markedly but differentially up-regulated at T6-T11 levels in SCT rats. Acute treatment with ketamine (50 mg/kg i.p.), morphine (3-10 mg/kg s.c.) and tapentadol (10-20 mg/kg i.p.) significantly increased pressure threshold to trigger nocifensive reaction in the von Frey filaments test, whereas amitriptyline, pregabalin, gabapentin and clonazepam were ineffective. Because all SCT rats developed long lasting, reproducible and stable allodynia, which could be alleviated by drugs effective in humans, thoracic cord transection might be a reliable model for testing innovative therapies aimed at reducing spinal cord lesion-induced central neuropathic pain.
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Affiliation(s)
- Saïd M'Dahoma
- Centre de Psychiatrie et Neurosciences, Institut National de la Santé et de la Recherche Médicale, INSERM U894, Université Paris Descartes, Paris, France
- Neuropsychopharmacologie, Faculté de Médecine Pierre et Marie Curie, site Pitié-Salpêtrière, Paris, France
- * E-mail:
| | - Sylvie Bourgoin
- Centre de Psychiatrie et Neurosciences, Institut National de la Santé et de la Recherche Médicale, INSERM U894, Université Paris Descartes, Paris, France
- Neuropsychopharmacologie, Faculté de Médecine Pierre et Marie Curie, site Pitié-Salpêtrière, Paris, France
| | - Valérie Kayser
- Centre de Psychiatrie et Neurosciences, Institut National de la Santé et de la Recherche Médicale, INSERM U894, Université Paris Descartes, Paris, France
- Neuropsychopharmacologie, Faculté de Médecine Pierre et Marie Curie, site Pitié-Salpêtrière, Paris, France
| | - Sandrine Barthélémy
- Centre de Psychiatrie et Neurosciences, Institut National de la Santé et de la Recherche Médicale, INSERM U894, Université Paris Descartes, Paris, France
- Neuropsychopharmacologie, Faculté de Médecine Pierre et Marie Curie, site Pitié-Salpêtrière, Paris, France
| | - Caroline Chevarin
- Centre de Psychiatrie et Neurosciences, Institut National de la Santé et de la Recherche Médicale, INSERM U894, Université Paris Descartes, Paris, France
- Neuropsychopharmacologie, Faculté de Médecine Pierre et Marie Curie, site Pitié-Salpêtrière, Paris, France
| | - Farah Chali
- Laboratoire de Neurobiologie des Signaux Intercellulaires, Centre National de la Recherche Scientifique, CNRS UMR 7101, Université Pierre et Marie Curie, Paris, France
| | - Didier Orsal
- Laboratoire de Neurobiologie des Signaux Intercellulaires, Centre National de la Recherche Scientifique, CNRS UMR 7101, Université Pierre et Marie Curie, Paris, France
| | - Michel Hamon
- Centre de Psychiatrie et Neurosciences, Institut National de la Santé et de la Recherche Médicale, INSERM U894, Université Paris Descartes, Paris, France
- Neuropsychopharmacologie, Faculté de Médecine Pierre et Marie Curie, site Pitié-Salpêtrière, Paris, France
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Wang Y, Cao SE, Tian J, Liu G, Zhang X, Li P. Auraptenol attenuates vincristine-induced mechanical hyperalgesia through serotonin 5-HT1A receptors. Sci Rep 2013; 3:3377. [PMID: 24287473 PMCID: PMC3843163 DOI: 10.1038/srep03377] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 11/05/2013] [Indexed: 12/16/2022] Open
Abstract
Common chemotherapeutic agents such as vincristine often cause neuropathic pain during cancer treatment in patients. Such neuropathic pain is refractory to common analgesics and represents a challenging clinical issue. Angelicae dahuricae radix is an old traditional Chinese medicine with demonstrated analgesic efficacy in humans. However, the active component(s) that attribute to the analgesic action have not been identified. This work described the anti-hyperalgesic effect of one coumarin component, auraptenol, in a mouse model of chemotherapeutic agent vincristine-induced neuropathic pain. We reported that auraptenol dose-dependently reverted the mechanical hyperalgesia in mice within the dose range of 0.05–0.8 mg/kg. In addition, the anti-hyperalgesic effect of auraptenol was significantly blocked by a selective serotonin 5-HT1A receptor antagonist WAY100635 (1 mg/kg). Within the dose range studied, auraptenol did not significantly alter the general locomotor activity in mice. Taken together, this study for the first time identified an active component from the herbal medicine angelicae dahuricae radix that possesses robust analgesic efficacy in mice. These data support further studies to assess the potential of auraptenol as a novel analgesic for the management of neuropathic pain.
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Affiliation(s)
- Yunfei Wang
- Department of Anesthesiology, First Affiliated Hospital, Xinxiang Medical University, Weihui, Henan, China 453100
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Horiguchi N, Ago Y, Hasebe S, Higashino K, Asada K, Kita Y, Takuma K, Matsuda T. Isolation rearing reduces mechanical allodynia in a mouse model of chronic inflammatory pain. Pharmacol Biochem Behav 2013; 113:46-52. [PMID: 24161684 DOI: 10.1016/j.pbb.2013.10.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 10/02/2013] [Accepted: 10/16/2013] [Indexed: 10/26/2022]
Abstract
Social isolation rearing in mice after weaning reduces pain sensitivity to acute pain, and this hypoalgesia is mediated by the descending serotonergic pain inhibitory system in which the spinal serotonin (5-HT)1A receptor is involved. However, it is not known whether isolation rearing affects pain sensitivity to neuropathic or inflammatory chronic pain. In this study, we examined the effects of isolation rearing on chronic pain induced by Freund's complete adjuvant (FCA) and partial sciatic nerve ligation using the von Frey test (to assess mechanical allodynia) and the plantar test (to assess thermal hyperalgesia). In the FCA model, isolation rearing reduced mechanical allodynia, but not thermal hyperalgesia. In contrast, isolation rearing had no effect on allodynia or hyperalgesia in the sciatic nerve ligation model. The isolation rearing-induced inhibition of allodynia was alleviated by intrathecal injection of WAY100635, a selective 5-HT1A receptor antagonist. FCA increased 5-HT turnover and decreased 5-HT1A receptor expression in the spinal cord of group-reared mice, while it did not have these effects in isolation-reared mice. These results suggest that FCA suppresses the serotonergic pain inhibitory system selectively in group-reared mice. Moreover, systemic administration of osemozotan, a selective 5-HT1A receptor agonist, inhibited FCA-induced mechanical allodynia in group-reared mice, and this effect of the drug was suppressed by intrathecal injection of WAY100635. Collectively, these findings suggest that isolation rearing selectively reduces FCA-induced mechanical allodynia in mice and that this effect is mediated by the activation of spinal 5-HT1A receptors.
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Affiliation(s)
- Naotaka Horiguchi
- Laboratory of Medicinal Pharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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Yamuna TS, Yathirajan HS, Ramakrishna RA, Gerber T, Hosten E, Betz R. Redetermination of the structure of N-(2-benzoyl-4-chlorophenyl)-2- chloroacetamide, C15H11Cl2NO2. Z KRIST-NEW CRYST ST 2013. [DOI: 10.1524/ncrs.2013.0098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract C15H11Cl2NO2, triclinic, P1¯ (no. 2), a = 5.9681(3) Å, b = 9.9888(5) Å, c = 11.9936(6) Å, α = 81.800(2)°, β = 77.113(2)°, γ = 81.364(2)°, V = 684.6 Å3, Z = 2, Rgt(F) = 0.0314, wRref(F2) = 0.0818, T = 200 K.
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Affiliation(s)
- Thammarse S. Yamuna
- 1University of Mysore, Department of Studies in Chemistry, Manasagangotri, Mysore 570 006, India
| | - Hemmige S. Yathirajan
- 1University of Mysore, Department of Studies in Chemistry, Manasagangotri, Mysore 570 006, India
| | - Ramesha A. Ramakrishna
- 2R. L. Fine Chem., No. 15 KHB Industrial Area, Yelahanka New Town, Bangalore 560 106, India
| | - Thomas Gerber
- 3Nelson Mandela Metropolitan University, Summerstrand Campus, Department of Chemistry, University Way, Summerstrand, PO Box 77000, Port Elizabeth 6031, South Africa
| | - Eric Hosten
- 3Nelson Mandela Metropolitan University, Summerstrand Campus, Department of Chemistry, University Way, Summerstrand, PO Box 77000, Port Elizabeth 6031, South Africa
| | - Richard Betz
- 3Nelson Mandela Metropolitan University, Summerstrand Campus, Department of Chemistry, University Way, Summerstrand, PO Box 77000, Port Elizabeth 6031, South Africa
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Guenther U, Wrigge H, Theuerkauf N, Boettcher MF, Wensing G, Zinserling J, Putensen C, Hoeft A. Repinotan, a selective 5-HT1A-R-agonist, antagonizes morphine-induced ventilatory depression in anesthetized rats. Anesth Analg 2010; 111:901-7. [PMID: 20802053 DOI: 10.1213/ane.0b013e3181eac011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Spontaneous breathing during mechanical ventilation improves arterial oxygenation and cardiovascular function, but is depressed by opioids during critical care. Opioid-induced ventilatory depression was shown to be counteracted in anesthetized rats by serotonin(1A)-receptor (5-HT(1A)-R)-agonist 8-OH-DPAT, which cannot be applied to humans. Repinotan hydrochloride is a selective 5-HT(1A)-R-agonist already investigated in humans, but the effects on ventilation and nociception are unknown. In this study, we sought to establish (a) the effects of repinotan on spontaneous breathing and nociception, and (b) the interaction with the standard opiate morphine. METHODS The dose-dependent effects of repinotan, given alone or in combination with morphine, on spontaneous minute ventilation (MV) and nociceptive tail-flick reflex latencies (TFLs) were measured simultaneously in spontaneously breathing anesthetized rats. An additional series with NaCl 0.9% and the 5-HT(1A)-R-antagonist WAY 100 135 served as controls. RESULTS (a) Repinotan dose-dependently activated spontaneous breathing (MV, mean [95% confidence interval]; 53% [29%-77%]) of pretreatment level) and suppressed nociception (TLF, 91% maximum possible effect [68%-114%]) with higher doses of repinotan (2-200 μg/kg). On the contrary, nociception was enhanced with a small dose of repinotan (0.2 μg/kg; TFL, -47% maximum possible effect [-95% to 2%]). Effects were prevented by 5-HT(1A)-antagonist WAY 100 135. (B) Morphine-induced depression of ventilation (MV, -72% [-100% to -44%]) was reversed by repinotan (20 μg/kg), which returned spontaneous ventilation to pretreatment levels (MV, 18% [-40% to 77%]). The morphine-induced complete depression of nociception was sustained throughout repinotan and NaCl 0.9% administration. Despite a mild decrease in mean arterial blood pressure, there were no serious cardiovascular side effects from repinotan. CONCLUSIONS The 5-HT(1A)-R-agonist repinotan activates spontaneous breathing in anesthetized rats even in morphine-induced ventilatory depression. The potency of 5-HT(1A)-R-agonists to stimulate spontaneous breathing and their antinociceptive effects should be researched further.
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Affiliation(s)
- U Guenther
- University Hospital of Bonn, Clinic of Anaesthesiology and Intensive Care Medicine, Bonn, Germany.
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22
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Validity of acute and chronic tactile sensory testing after spinal cord injury in rats. Exp Neurol 2010; 225:366-76. [PMID: 20643128 DOI: 10.1016/j.expneurol.2010.07.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2010] [Revised: 07/10/2010] [Accepted: 07/13/2010] [Indexed: 11/22/2022]
Abstract
Spinal cord injury (SCI) impairs sensory systems causing allodynia. Measuring the development of allodynia in rodent models of SCI is challenging due to spinal shock and marked motor impairments. Assessment of SCI-induced allodynia is not standardized across labs, making interpretation of results difficult. Therefore, we validated sensory threshold assessment after SCI and developed a novel assessment of allodynia prior to motor recovery in a rat SCI model. One hundred fifty-six Sprague-Dawley rats received T8 laminectomy or mild to moderate SCI using the OSU SCI device (0.3 mm to 1.3 mm cord displacement). To determine tactile thresholds, von Frey hairs (VFH) were applied in Up-Down or ascending order to the dorsal or plantar hindpaw. The most efficient and valid procedures that maintain high sensitivity and specificity were identified. Ten Up-Down VFH applications yielded stable thresholds; reducing the risk of threshold decay and unnecessary exposure to painful stimuli. Importantly, distraction of SCI-rats with food revealed differential decay of thresholds than when distraction is not provided. The new test uses dorsal VFH stimulation and is independent of trunk or hindlimb control. Acute dorsal VFH thresholds collected before recovery of hindlimb weight support accurately predicted plantar VFH thresholds measured at late timepoints (chi(2)=8.479; p<0.05). Thus, standardized testing early after SCI using the dorsal VFH test or later using 10 stimuli in the Up-Down test produces valid measures of tactile sensation across many SCI severities. Early detection of allodynia in experimental SCI will allow identification of mechanisms responsible for pain development and determine targets for therapeutic interventions.
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Poon CS. Optimal interaction of respiratory and thermal regulation at rest and during exercise: role of a serotonin-gated spinoparabrachial thermoafferent pathway. Respir Physiol Neurobiol 2009; 169:234-42. [PMID: 19770073 DOI: 10.1016/j.resp.2009.09.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 08/24/2009] [Accepted: 09/14/2009] [Indexed: 11/26/2022]
Abstract
Recent evidence indicates that the lateral parabrachial nucleus (LPBN) in dorsolateral pons is pivotal in mediating the feedback control of inspiratory drive by central chemoreceptor input and feedforward control of body temperature by cutaneous thermoreceptor input. The latter is subject to descending serotonergic inhibition which gates the transmission of ascending thermoafferent information from spinal dorsal horn to the LPBN. Here, a model is proposed which suggests that the LPBN may be important in balancing respiratory and thermal homeostasis, two conflicting goals that are heightened by environmental heat/cold stress or exercise where the effects of respiratory thermolysis become prominent. This optimization model of respiratory-thermoregulatory interaction is supported by a host of recent studies which demonstrate that animals with serotonin (5-HT) dysfunction at the spinal dorsal horn--due to 5-HT antagonism, genetic 5-HT defects or spinal cord injury--all display similar respiratory abnormalities that are consistent with hyperactivity of the spinoparabrachial thermoafferent (and pain) pathway.
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Affiliation(s)
- Chi-Sang Poon
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Bldg E25-250, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
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Jasinski JP, Butcher RJ, Hakim Al-Arique QNM, Yathirajan HS, Ramesha AR. 2-Amino-5-nitrophenyl 2-chlorophenyl ketone. Acta Crystallogr Sect E Struct Rep Online 2009; 65:o1908-9. [PMID: 21583597 PMCID: PMC2977436 DOI: 10.1107/s160053680902755x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Accepted: 07/13/2009] [Indexed: 11/10/2022]
Abstract
In the title compound, C13H9ClN2O3, an intramolecular hydrogen bond between the carbonyl O and an amine H atom from the 2-aminobenzoyl group stabilizes the molecule, keeping these two groups nearly in the same plane [dihedral angle 14.6 (6)°]. The dihedral angle between the mean planes of the planar 2-aminobenzoyl and 2-chlorobenzoyl groups is 73.8 (6)°. The crystal packing is stabilized by a collection of intermediate hydrogen-bonding interactions which forms an infinite N—H⋯O⋯H—N—H⋯O hydrogen-bonded chain along the c axis in concert with weak N—H⋯Cl interactions in the same direction, producing a two-dimensional intermolecular bonding network parallel to (001). Additional weak C—Cl⋯Cg [Cl⋯Cg = 3.858 (3) Å] and N—O⋯Cg [O⋯Cg = 3.574 (1) and 3.868 (6) Å] π-ring interactions provide added support to the crystal stability. A MOPAC computational calculation gives support to these observations.
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25
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Guenther U, Manzke T, Wrigge H, Dutschmann M, Zinserling J, Putensen C, Hoeft A. The Counteraction of Opioid-Induced Ventilatory Depression by the Serotonin 1A-Agonist 8-OH-DPAT Does Not Antagonize Antinociception in Rats In Situ and In Vivo. Anesth Analg 2009; 108:1169-76. [DOI: 10.1213/ane.0b013e318198f828] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Rusbridge C, Jeffery ND. Pathophysiology and treatment of neuropathic pain associated with syringomyelia. Vet J 2008; 175:164-72. [PMID: 17317245 DOI: 10.1016/j.tvjl.2006.12.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2006] [Revised: 11/04/2006] [Accepted: 12/16/2006] [Indexed: 01/04/2023]
Abstract
The pain behaviour expressed by dogs with syringomyelia suggests that they experience neuropathic pain, probably due to disordered neural processing in the damaged dorsal horn. As such it is likely that conventional analgesic medication will be ineffective. In this review, physiological and pathological pain processing through the dorsal horn is summarised and mechanisms by which syringomyelia could result in a persistent pain state are discussed. Finally, current knowledge regarding treatment of Chiari malformation and syringomyelia is reviewed and possible drugs which may give improved pain relief in affected dogs are discussed.
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Affiliation(s)
- Clare Rusbridge
- Stone Lion Veterinary Centre, Wimbledon Village, London SW19 5AU, UK.
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27
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Maurel JL, Autin JM, Funes P, Newman-Tancredi A, Colpaert F, Vacher B. High-efficacy 5-HT1A agonists for antidepressant treatment: a renewed opportunity. J Med Chem 2007; 50:5024-33. [PMID: 17803293 DOI: 10.1021/jm070714l] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the discovery of novel 5-HT1A receptor agonists and describe the process that led to the antidepressant candidate 9 (F 15599). 9 has nanomolar affinity for 5-HT1A binding sites and is over 1000-fold selective with respect to the other 5-HT1 receptor subtypes, 5-HT2-7 receptor families, and also numerous GPCRs, transporters, ion channels, and enzymes. In a cellular model of signal transduction, 9 activates h5-HT1A receptors with an efficacy superior to that of the prototypical 5-HT1A agonist (+/-)-8-OH-DPAT and comparators undergoing clinical trials. After acute oral administration in rats, 9 totally reverses immobility in the forced swimming test and produces behaviors characteristic of 5-HT1A receptor activation. However, these effects occurred at widely separated doses, suggesting that 9 discriminates between distinct populations of 5-HT1A receptors. While the clinical relevance of these observations is still unknown, this opens new perspectives for the treatment of depressive disorders.
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Affiliation(s)
- Jean Louis Maurel
- Task Force Chemistry, Medicinal Chemistry 1 Division, Neurobiology 2 Division, and Toulouse ISTMT 2, Pierre Fabre Research Center, 17 avenue Jean Moulin, 81106 Castres Cedex, France
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Deseure K, Bréand S, Colpaert FC. Curative-like analgesia in a neuropathic pain model: Parametric analysis of the dose and the duration of treatment with a high-efficacy 5-HT1A receptor agonist. Eur J Pharmacol 2007; 568:134-41. [PMID: 17512927 DOI: 10.1016/j.ejphar.2007.04.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2006] [Revised: 04/05/2007] [Accepted: 04/12/2007] [Indexed: 10/23/2022]
Abstract
High-efficacy activation of central 5-HT(1A) receptors by means of the recently discovered, selective 5-HT(1A) receptor ligand, F 13640 [(3-chloro-4-fluoro-phenyl)-[4-fluoro-4-{[(5-methyl-pyridin-2-ylmethyl)-amino]methyl}piperidin-1-yl]methanone, fumaric acid salt] causes an unprecedented, broad-spectrum analgesia in rat models of acute and chronic pain of nociceptive and neuropathic origin; it also is effective in conditions where opioids either are ineffective, induce analgesic tolerance, or elicit persistent hyperalgesia/allodynia. Inversely mirroring morphine's actions, F 13640's ("curative-like") analgesic effects persist after the discontinuation of treatment. Here, we examined the relationships, if any, between the dose and the duration of F 13640 treatment on the one hand, and the duration of persistent analgesia on the other. Rats received unilateral infraorbital nerve injury and developed allodynia - as assessed by an increased response to von Frey filament stimulation - within 24 days; thereafter, using osmotic pumps, rats were subcutaneously infused with F 13640 in two experiments. In one, a one-week infusion was instituted at 0.04-10-mg/day doses; in a second experiment, a 0.63-mg/day dose was implemented for a duration ranging from 1 to 56 days. These 250- and 56-fold variations of the dose and duration of treatment caused post-treatment, persistent analgesia for about 10 and 40 days, respectively. At least as much as dose, the duration of F 13640 treatment determines F 13640-induced persistent analgesia. Neuroadaptive modulations at pre- and postsynaptic, brain and spinal cord 5-HT(1A) receptors may be involved in the dynamical, dose- and time-dependent, pre-treatment rise and post-treatment decay of the analgesia induced by high-efficacy 5-HT(1A) receptor activation.
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Affiliation(s)
- Kristof Deseure
- Laboratory of Anesthesiology, University of Antwerp, Universiteitsplein 1, 2610 Antwerp, Belgium
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Berrocoso E, De Benito MD, Mico JA. Role of serotonin 5-HT1A and opioid receptors in the antiallodynic effect of tramadol in the chronic constriction injury model of neuropathic pain in rats. Psychopharmacology (Berl) 2007; 193:97-105. [PMID: 17393145 DOI: 10.1007/s00213-007-0761-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Accepted: 02/28/2007] [Indexed: 11/24/2022]
Abstract
RATIONALE Tramadol (1RS, 2RS)-2-[(dimethylamino)-methyl]-1-(3-methoxyphenyl)-cyclohexanol) is an atypical centrally acting analgesic agent with weak opioid receptor affinity that, like some antidepressants, enhances the extraneuronal concentrations of the monoamine neurotransmitters, noradrenaline and serotonin, by interfering with their re-uptake and release mechanisms. OBJECTIVES The present study was undertaken to evaluate the potential role of 5-HT(1A) receptors and opioids receptors in the analgesic effect of tramadol in neuropathic pain. With this aim, the effect of either a selective 5-HT(1A) receptor antagonist (WAY-100635, N-2-[4-(2-methoxyphenyl-1-piperazinyl]ethyl]-N-2-pyridinylcyclohexane carboxamide) or a selective 5-HT(1A) receptor agonist (8-OH-DPAT, 8-hydroxy-2-(di-n-propylamine) tetralin hydrobromide) or an opioid receptor antagonist (naloxone; naloxone hydrochloride dihydrate) was investigated in combination with tramadol by means of the cold-plate test in the chronic constriction injury model in rats. RESULTS The results showed that WAY-100635 (0.8 mg/kg) significantly enhanced the antiallodynic effect of non-effective doses of tramadol (5-10 mg/kg). In contrast, 8-OH-DPAT (0.5 mg/kg) counteracted the antiallodynic effect of an effective dose of tramadol (22 mg/kg). Naloxone (0.5 mg/kg) partially counteracted the antiallodynic effect of tramadol (22 mg/kg). CONCLUSIONS These findings suggest the involvement of opioid and 5-HT(1A) receptors in the antinociceptive effect of tramadol and support the idea that the combination of tramadol with compounds having 5-HT(1A) antagonist properties could be a new strategy to improve tramadol-induced analgesia in neuropathic pain.
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Affiliation(s)
- Esther Berrocoso
- Pharmacology and Neuroscience Research Group, Department of Neuroscience (Pharmacology and Psychiatry), School of Medicine, University of Cádiz, Plaza Falla 9, 11003, Cadiz, Spain,
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Bravo G, Ibarra A, Guizar-Sahagún G, Rojas G, Hong E. Indorenate improves motor function in rats with chronic spinal cord injury. Basic Clin Pharmacol Toxicol 2007; 100:67-70. [PMID: 17214613 DOI: 10.1111/j.1742-7843.2007.00004.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The effect of indorenate (5-methoxytryptamine, beta-methyl carboxylate hydrochloride), a 5-HT1A agonist, was investigated on the motor performance of rats with chronic spinal cord injury. Four months after a ninth thoracic vertebrae spinal cord contusion, 29 rats were randomly allocated into two groups: saline solution and indorenate-treated animals with daily doses incremented at weekly intervals. The locomotor performance of all rats was measured by the Basso, Beattie, and Bresnahan (BBB) rating scale. The results showed that at the end of the treatment, the motor activity of indorenate group was significantly better than that presented by saline solution group. The 80% of indorenate, (against 15% of saline solution) did not show detriment on motor activity. When we analysed the motor activity of rats with basal BBB lower than 10, a significant improvement of motor recovery in indorenate-treated animals was observed. The benefits observed in locomotor function at low doses followed by increasing doses could be associated with pharmacological treatment by indorenate, a well-known 5-HT1A receptor agonist. Our results suggest a potential mechanism by which serotonergic agents may improve motor function in rats with chronic spinal cord injury.
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Affiliation(s)
- Guadalupe Bravo
- Department of Pharmacobiology, CINVESTAV-IPN, Sede Sur, Mexico.
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Wei H, Pertovaara A. 5-HT1A receptors in endogenous regulation of neuropathic hypersensitivity in the rat. Eur J Pharmacol 2006; 535:157-65. [PMID: 16545367 DOI: 10.1016/j.ejphar.2006.02.019] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2005] [Revised: 02/09/2006] [Accepted: 02/13/2006] [Indexed: 11/28/2022]
Abstract
The role of medullary and spinal 5-HT(1A) receptors in endogenous regulation of neuropathic hypersensitivity was studied. When administered in the rostroventromedial medulla or subcutaneously, WAY-100635, a 5-HT(1A) receptor antagonist, attenuated mechanical hypersensitivity in rats with a spinal nerve injury. Thermal or mechanical nociception outside of the injured area was not influenced by medial medullary or subcutaneous administration of WAY-100635. Intrathecal administration of WAY-100635 had no significant effect on pain-related behavior. Suppression of mechanical hypersensitivity induced by medial medullary administration of WAY-100635 was reversed by intrathecal administration of WAY-100635 or atipamezole, an alpha2-adrenoceptor antagonist, but not by naloxone, an opioid receptor antagonist. The results indicate that endogenous release of 5-HT, via action on medial medullary 5-HT(1A) receptors, tonically suppresses descending inhibition in neuropathic animals. Following medial medullary administration of a 5-HT(1A) receptor antagonist, descending pain regulatory pathways are disinhibited. This leads to selective attenuation of neuropathic hypersensitivity, due to action on spinal 5-HT(1A) receptors and alpha2-adrenoceptors.
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Affiliation(s)
- Hong Wei
- Biomedicum Helsinki, Institute of Biomedicine/Physiology, POB 63, 00014 University of Helsinki, Finland
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Kiss I, Degryse AD, Bardin L, Gomez de Segura IA, Colpaert FC. The novel analgesic, F 13640, produces intra- and postoperative analgesia in a rat model of surgical pain. Eur J Pharmacol 2005; 523:29-39. [PMID: 16226246 DOI: 10.1016/j.ejphar.2005.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2002] [Revised: 08/23/2005] [Accepted: 09/01/2005] [Indexed: 11/17/2022]
Abstract
F 13640 is a newly discovered high-efficacy 5-HT(1A) receptor agonist that produces exceptional analgesia in animal models of tonic and chronic, nociceptive and neuropathic pains by novel molecular and neuroadaptive mechanisms. Here we examined the effects of F 13640 and remifentanil (0.63 mg/kg with either compound) when injected i.p. either before or 15 min after rats underwent orthopedic surgery. Surgery consisted of the drilling of a hole in the calcaneus bone and of an incision of the skin, fascia and plantar muscle of one foot. During surgery, the concentration of volatile isoflurane was progressively incremented depending on the animal's response to surgical maneuvers. Other experiments examined the dose-dependent effects of F 13640 (0.04 to 0.63 mg/kg) on surgical pain as well as on the Minimum Alveolar Concentration of isoflurane. Both F 13640 and remifentanil markedly reduced the intra-operative isoflurane requirement. F 13640 also reduced measures of postoperative pain (i.e., paw elevation and flexion). With these postoperative measures, remifentanil produced short-lived analgesia followed by hyperalgesia. F 13640 significantly reduced both surgical pain and the isoflurane Minimum Alveolar Concentration from 0.16 mg/kg onward. F 13640 produced powerful intra- and postoperative analgesia in rats undergoing orthopedic surgery. Unlike the opioid, remifentanil, F 13640 caused no hyperalgesia with ongoing postoperative pain, and should remain effective with protracted postoperative use.
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MESH Headings
- Analgesia
- Analgesics, Non-Narcotic/administration & dosage
- Analgesics, Non-Narcotic/pharmacology
- Analgesics, Opioid/administration & dosage
- Analgesics, Opioid/adverse effects
- Analgesics, Opioid/pharmacology
- Analysis of Variance
- Anesthetics, Inhalation/administration & dosage
- Anesthetics, Inhalation/pharmacokinetics
- Anesthetics, Inhalation/pharmacology
- Animals
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Hyperalgesia/chemically induced
- Isoflurane/administration & dosage
- Isoflurane/pharmacokinetics
- Isoflurane/pharmacology
- Male
- Monitoring, Intraoperative
- Orthopedic Procedures/adverse effects
- Pain/etiology
- Pain/prevention & control
- Pain Measurement/methods
- Pain Threshold/drug effects
- Pain, Postoperative/etiology
- Pain, Postoperative/prevention & control
- Piperazines/pharmacology
- Piperidines/administration & dosage
- Piperidines/adverse effects
- Piperidines/pharmacology
- Pulmonary Alveoli/metabolism
- Pyridines/administration & dosage
- Pyridines/pharmacology
- Rats
- Rats, Sprague-Dawley
- Remifentanil
- Serotonin Antagonists/pharmacology
- Vocalization, Animal/drug effects
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Affiliation(s)
- Ivan Kiss
- Klinik für Anästhesie, Intensivmedizin und Schmerztherapie, Alfried Krupp Krankenhaus, 45117 Essen, Germany
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Bardin L, Assié MB, Pélissou M, Royer-Urios I, Newman-Tancredi A, Ribet JP, Sautel F, Koek W, Colpaert FC. Dual, hyperalgesic, and analgesic effects of the high-efficacy 5-hydroxytryptamine 1A (5-HT1A) agonist F 13640 [(3-chloro-4-fluoro-phenyl)-[4-fluoro-4-{[(5-methyl-pyridin-2-ylmethyl)-amino]-methyl}piperidin-1-yl]methanone, fumaric acid salt]: relationship with 5-HT1A receptor occupancy and kinetic parameters. J Pharmacol Exp Ther 2004; 312:1034-42. [PMID: 15528450 DOI: 10.1124/jpet.104.077669] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The aim of the present study was to establish the relationship between the plasma and brain concentration-time profiles of F 13640 [(3-chloro-4-fluoro-phenyl)-[4-fluoro-4-{[(5-methyl-pyridin-2-ylmethyl)-amino]-methyl}piperidin-1-yl]methanone, fumaric acid salt] after acute administration and both its hyper- and hypoanalgesic effects in rats. The maximal plasma concentration (C(max)) of F 13640 after i.p. administration of 0.63 mg/kg was obtained at 15 min and decreased to half its maximal value after about 1 h. The amount of F 13640 collected by means of in vivo microdialysis in hippocampal dialysates could be measured reliably after 0.63 and 2.5 mg/kg, reached its maximum at about 1 h, and fell to half of its maximal value at about 3 h. 5-Hydroxytryptamine 1A (5-HT(1A)) receptor occupancy was estimated by ex vivo binding in rat brain sections. F 13640 inhibited [(3)H]8-hydroxy-2-[di-n-propylamino] tetralin binding ex vivo in rat hippocampus, entorhinal cortex, and frontal cortex (ED(50), 0.34 mg/kg i.p.). Maximal inhibition was reached at approximately 30 min after 0.63 mg/kg F 13640 and fell to half of its value after about 4 to 8 h. After injection (15 min) in the paw pressure test, F 13640 (0.63 mg/kg i.p.) induced an initial hyperalgesia that was followed 4 h later by a paradoxical analgesia that lasted until 8 h. In contrast, in the formalin test, F 13640 inhibited pain behaviors until 4 h after drug administration. F 13640 also produced elements of the 5-HT syndrome that lasted up to 4 h after administration. These results demonstrate that F 13640 induces hyperalgesia and/or analgesia with a time course that parallels the occupancy of 5-HT(1A) receptors and the presence of the compound in blood and brain.
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Affiliation(s)
- Laurent Bardin
- Department of General Pharmacology, Centre de Recherche Pierre Fabre, 17 avenue Jean Moulin, 81106 Castres Cedex, France.
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