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Manrique-Maldonado G, Altamirano-Espinoza AH, Marichal-Cancino BA, Rivera-Mancilla E, Avilés-Rosas V, Villalón CM. Pharmacological evidence that histamine H3 receptors inhibit the vasodepressor responses by selective stimulation of the rat perivascular sensory CGRPergic outflow. Eur J Pharmacol 2015; 754:25-31. [PMID: 25704614 DOI: 10.1016/j.ejphar.2015.02.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 02/05/2015] [Accepted: 02/11/2015] [Indexed: 10/24/2022]
Abstract
This study has investigated whether pharmacological activation of Gi/o coupled histamine H3/H4 receptors inhibits the rat vasodepressor sensory outflow. For this purpose, 100 male Wistar rats were pithed, artificially ventilated and pretreated (i.v.) with: 25mg/kg gallamine, 2mg/kg/min hexamethonium and 20μg/kg/min methoxamine, followed by i.v. continuous infusions of physiological saline (0.02ml/min) or immepip (3.1, 10 or 31μg/kg/min; a histamine H3/H4 receptor agonist). Under these conditions, electrical stimulation (0.56-5.6Hz; 50V and 2ms) of the spinal cord (T9-T12) resulted in frequency-dependent vasodepressor responses, which were: (i) unchanged during the infusions of saline or immepip (3.1μg/kg/min); and (ii) significantly but, surprisingly, not dose-dependently inhibited by 10 and 31μg/kg/min immepip. Moreover, the sensory-inhibition by 10μg/kg/min immepip (which failed to inhibit the vasodepressor responses by i.v. bolus injections of α-CGRP; 0.1-1µg/kg) was: (i) essentially unaltered after i.v. administration of saline (1ml/kg) or blocking doses of the antagonists ketotifen (100μg/kg; H1), ranitidine (1000μg/kg; H2) or JNJ7777120 (310μg/kg; H4); and (ii) abolished after i.v. thioperamide (310µg/kg; H3). In conclusion, our results suggest that immepip-induced inhibition of the vasodepressor sensory outflow is mainly mediated by prejunctional activation of histamine H3 receptors.
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Affiliation(s)
- Guadalupe Manrique-Maldonado
- Departamento de Farmacobiología, Cinvestav-Coapa, Czda. Tenorios No. 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 México D.F., Mexico.
| | - Alain H Altamirano-Espinoza
- Departamento de Farmacobiología, Cinvestav-Coapa, Czda. Tenorios No. 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 México D.F., Mexico.
| | - Bruno A Marichal-Cancino
- Departamento de Farmacobiología, Cinvestav-Coapa, Czda. Tenorios No. 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 México D.F., Mexico.
| | - Eduardo Rivera-Mancilla
- Departamento de Farmacobiología, Cinvestav-Coapa, Czda. Tenorios No. 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 México D.F., Mexico.
| | - Victor Avilés-Rosas
- Departamento de Farmacobiología, Cinvestav-Coapa, Czda. Tenorios No. 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 México D.F., Mexico.
| | - Carlos M Villalón
- Departamento de Farmacobiología, Cinvestav-Coapa, Czda. Tenorios No. 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 México D.F., Mexico.
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Tabarean IV. Functional pharmacology of H1 histamine receptors expressed in mouse preoptic/anterior hypothalamic neurons. Br J Pharmacol 2014; 170:415-25. [PMID: 23808378 DOI: 10.1111/bph.12286] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 05/15/2013] [Accepted: 06/20/2013] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND AND PURPOSE Histamine H1 receptors are highly expressed in hypothalamic neurons and mediate histaminergic modulation of several brain-controlled physiological functions, such as sleep, feeding and thermoregulation. In spite of the fact that the mouse is used as an experimental model for studying histaminergic signalling, the pharmacological characteristics of mouse H1 receptors have not been studied. In particular, selective and potent H1 receptor agonists have not been identified. EXPERIMENTAL APPROACH Ca(2+) imaging using fura-2 fluorescence signals and whole-cell patch-clamp recordings were carried out in mouse preoptic/anterior hypothalamic neurons in culture. KEY RESULTS The H1 receptor antagonists mepyramine and trans-triprolidine potently antagonized the activation by histamine of these receptors with IC50 values of 0.02 and 0.2 μM respectively. All H1 receptor agonists studied had relatively low potency at the H1 receptors expressed by these neurons. Methylhistaprodifen and 2-(3-trifluoromethylphenyl)histamine had full-agonist activity with potencies similar to that of histamine. In contrast, 2-pyridylethylamine and betahistine showed only partial agonist activity and lower potency than histamine. The histamine receptor agonist, 6-[2-(4-imidazolyl)ethylamino]-N-(4-trifluoromethylphenyl)heptanecarboxamide (HTMT) had no agonist activity at the H1 receptors H1 receptors expressed by mouse preoptic/anterior hypothalamic neurons but displayed antagonist activity. CONCLUSIONS AND IMPLICATIONS Methylhistaprodifen and 2-(3-trifluoromethylphenyl)histamine were identified as full agonists of mouse H1 receptors. These results also indicated that histamine H1 receptors in mice exhibited a pharmacological profile in terms of agonism, significantly different from those of H1 receptors expressed in other species.
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Affiliation(s)
- I V Tabarean
- Department of Molecular and Cellular Neuroscience, The Scripps Research Institute, La Jolla, CA, USA
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Disruption of Fast Axonal Transport in the Rat Induces Behavioral Changes Consistent With Neuropathic Pain. THE JOURNAL OF PAIN 2013; 14:1437-49. [DOI: 10.1016/j.jpain.2013.07.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 05/28/2013] [Accepted: 07/07/2013] [Indexed: 12/27/2022]
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Focal nerve inflammation induces neuronal signs consistent with symptoms of early complex regional pain syndromes. Exp Neurol 2009; 219:223-7. [DOI: 10.1016/j.expneurol.2009.05.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 05/15/2009] [Accepted: 05/18/2009] [Indexed: 12/25/2022]
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Bove GM, Weissner W, Barbe MF. Long lasting recruitment of immune cells and altered epi-perineurial thickness in focal nerve inflammation induced by complete Freund's adjuvant. J Neuroimmunol 2009; 213:26-30. [PMID: 19564053 DOI: 10.1016/j.jneuroim.2009.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2009] [Revised: 05/27/2009] [Accepted: 06/04/2009] [Indexed: 10/20/2022]
Abstract
Immune-mediated nerve inflammation is involved in many painful states in humans, and causes axonal and behavioral changes in rats. While models of nerve inflammation have been characterized using electrophysiological and behavioral methods, the presence of immune cells has not been fully assessed. We inflamed rat sciatic nerves using complete Freund's adjuvant and quantified the presence of ED-1 macrophages and TCR-alphabeta T-cells for up to 12 weeks. We report that these immune cells are prominent extraneurally up to 12 weeks following the induction of inflammation. This observation does not easily correlate with inflammation-induced axonal mechanical sensitivity, which peaks within 1 week and is resolved after 8 weeks.
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Affiliation(s)
- Geoffrey M Bove
- Dept. of Research Administration, University of Southern Maine, 178 Science Building, P.O. Box 9300, Portland, ME 04104-9300, USA.
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Alvarez EO. The role of histamine on cognition. Behav Brain Res 2008; 199:183-9. [PMID: 19126417 DOI: 10.1016/j.bbr.2008.12.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Accepted: 12/07/2008] [Indexed: 12/01/2022]
Abstract
Histamine was intensively studied at the beginning of the 20th century because of its important role in allergic and inflammation processes. In those days it was very difficult that researchers could envisage another impacting function for the imidazolamine in the living systems. Once the imidazolamine was found located in neuron compartment in the brain, increasing evidence supported many regulatory functions including its possible role in memory and learning. The specific participation of histamine in cognitive functions followed a slow and unclear pathway because the many different experimental learning models, pharmacologic approaches, systemic and localized applications of the histamine active compounds into the brain used by researchers showed facilitating or inhibitory effects on learning, generating an active issue that has extended up to present time. In this review, all these aspects are analyzed and discussed considering the many intracellular different mechanisms discovered for histamine, the specific histamine receptors and the compartmentalizing proprieties of the brain that might explain the apparent inconsistent effects of the imidazolamine in learning. In addition, a hypothetical physiologic role for histamine in memory is proposed under the standard theories of learning in experimental animals and humans.
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Affiliation(s)
- Edgardo O Alvarez
- Area de Farmacología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Laboratorio de Neuropsicofarmacología Experimental, IMBECU-CONICET, 5500 Mendoza, Argentina.
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Dilley A, Bove GM. Resolution of Inflammation-Induced Axonal Mechanical Sensitivity and Conduction Slowing in C-Fiber Nociceptors. THE JOURNAL OF PAIN 2008; 9:185-92. [DOI: 10.1016/j.jpain.2007.10.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Dilley A, Bove GM. Disruption of axoplasmic transport induces mechanical sensitivity in intact rat C-fibre nociceptor axons. J Physiol 2007; 586:593-604. [PMID: 18006580 DOI: 10.1113/jphysiol.2007.144105] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Peripheral nerve inflammation can cause axons conducting through the inflamed site to become mechanically sensitive. Axonal mechanical sensitivity (AMS) of intact axons may explain symptoms in a diverse number of conditions characterized by radiating pain evoked by movements of the affected nerve. Because nerve inflammation also disrupts axoplasmic transport, we hypothesized that the disruption of axoplasmic transport by nerve inflammation could cause the cellular components responsible for mechanical transduction to accumulate and become inserted at the inflamed site, causing AMS. This was tested by examining AMS in C-fibre nociceptors following the application of axoplasmic transport blockers (colchicine and vinblastine) to the sciatic nerve. Both 10 mm colchicine and 0.1 mm vinblastine caused AMS to develop in 30.6% and 33.3% of intact axons, respectively (P < 0.05 compared to sham treatment). Since high doses of colchicine (> 50 mm) can damage axons, and inflammation is involved in the removal of axonal debris, experiments were performed to assess conduction across the treatment site as well as signs of inflammation. Results indicated minimal axonal loss (95% of A- and C-fibres conducting), consistent with the normal microscopic appearance of the colchicine treatment site and absence of ED1-positive (recruited) macrophages. In a separate series of experiments, the block of axoplasmic transport proximal to a localized neuritis significantly reduced inflammation-induced AMS (15.6% compared to 55.6%; P < 0.05), further supporting that the components necessary for AMS are moved by anterograde transport. In summary, nerve inflammation that causes the disruption of axoplasmic transport in patients with painful conditions may result in the accumulation and insertion of mechanosensitive elements at the inflamed site.
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Affiliation(s)
- Andrew Dilley
- Department of Anesthesia, Critical Care and Pain Management, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
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Poveda R, Fernández-Dueñas V, Fernández A, Sánchez S, Puig MM, Planas E. Synergistic interaction between fentanyl and the histamine H3 receptor agonist R-(α)-methylhistamine, on the inhibition of nociception and plasma extravasation in mice. Eur J Pharmacol 2006; 541:53-6. [PMID: 16762339 DOI: 10.1016/j.ejphar.2006.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Revised: 04/27/2006] [Accepted: 05/08/2006] [Indexed: 10/24/2022]
Abstract
Here we report a synergistic interaction between fentanyl and the histamine H(3) receptor agonist R-(alpha)-methylhistamine on the inhibition of nociception and plasma extravasation in mice. Chronic inflammation was induced by subplantar injection of Complete Freund's Adjuvant into the right hind paw, and the effect of the drugs was evaluated 7 days later. Nociception and plasma extravasation were assessed by hot-plate and Evans blue tests respectively. Subcutaneous administration of fentanyl (0.01-0.1 mg/kg) induced dose-related anti-nociceptive and anti-extravasation effects (E(max)=100% and 62%, respectively). R-(alpha)-methylhistamine administration (0.3-3 mg/kg) showed a dose-related inhibitory effect on extravasation (E(max)=65%) but not on nociception. To analyze possible interaction between these two drugs, a dose-response curve to fentanyl plus a fixed dose of R-(alpha)-methylhistamine (0.5 mg/kg) was obtained. The dose-response curve for the combined treatment showed a shift to the left compared with that for fentanyl alone. Our results confirm that fentanyl and R-(alpha)-methylhistamine interact in a synergic way, inhibiting nociception and plasma extravasation.
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Affiliation(s)
- Raquel Poveda
- Pharmacology Unit, Department of Pathology and Experimental Therapeutics, School of Medicine, Campus Universitari Bellvitge, University of Barcelona, Feixa Llarga s/n, 08907 L'Hospitalet de Llobregat, Spain
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Dilley A, Lynn B, Pang SJ. Pressure and stretch mechanosensitivity of peripheral nerve fibres following local inflammation of the nerve trunk. Pain 2006; 117:462-472. [PMID: 16154692 PMCID: PMC1402335 DOI: 10.1016/j.pain.2005.08.018] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2005] [Revised: 07/29/2005] [Accepted: 08/12/2005] [Indexed: 10/25/2022]
Abstract
Patients with non-specific limb pain often show signs of nerve mechanosensitivity, i.e. local tenderness over nerve trunks and pain in response to limb movements that cause nerve stretch. In such patients a nerve lesion is not apparent, and it has been suggested that local neural inflammation may be a key factor. The present study examines the extent to which nerve fibres in regions of local inflammation respond to small stretches, and whether functional changes occur throughout the primary afferent neurone. A local neuritis was induced in adult rats by wrapping oxidised cellulose saturated in complete Freund's adjuvant (CFA) around the peroneal or sciatic nerves. A small cut was made in the perineurium of some of the peroneal lesioned animals. A- and C-fibre recordings were made 2-10 days post-surgery from filaments dissected proximal to the lesion. Local mechanosensitivity was assessed using a glass probe and by small stretches. Responses to stretch and local pressure were recorded in 7% of C- and 8% of A-fibres from the peroneal nerve following CFA treatment with the sheath opened. A smaller proportion of stretch sensitive fibres were seen in sciatic and peroneal nerves after CFA treatment alone (2% of C- and 3% of A-fibres), but such fibres were not seen in control preparations. The most responsive fibres fired to 3% stretch, which is within the range of nerve stretch seen during normal limb movements. Less than 1% of stretch sensitive fibres had peripheral fields, indicating that most had probably degenerated distally.
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Affiliation(s)
- Andrew Dilley
- * Corresponding author. Tel.: +44 207 679 6082; fax: +44 207 383 7005., E-mail address: (A. Dilley)
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Bell JK, McQueen DS, Rees JL. Involvement of histamine H4 and H1 receptors in scratching induced by histamine receptor agonists in Balb C mice. Br J Pharmacol 2004; 142:374-80. [PMID: 15066908 PMCID: PMC1574944 DOI: 10.1038/sj.bjp.0705754] [Citation(s) in RCA: 168] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The role of histamine H(1), H(2), H(3) and H(4) receptors in acute itch induced by histamine was investigated in female BalbC mice. Scratching was induced by intradermal injections of pruritogen into the back of the neck and "itch" assessed by quantifying the scratching evoked. Histamine (0.03-80 micromol), histamine-trifluoromethyl-toluidine (HTMT, H(1) agonist, 0.002-2 micromol), clobenpropit (H(4) agonist, H(3) antagonist, 0.002-0.6 micromol) and to a lesser extent imetit (H(3)/H(4) agonist, 0.03-3 micromol) all induced dose-dependent scratching. Dimaprit (H(2) agonist, 0.04-40 micromol) did not cause scratching. Mepyramine (H(1) antagonist, 20 mg kg(-1), i.p.) reduced scratching evoked by histamine and HTMT, but not that caused by H(3) or H(4) agonists. Thioperamide (H(3)/H(4) antagonist, 20 mg kg(-1), i.p.) reduced scratching induced by histamine, H(3) and H(4) agonists, but not that caused by HTMT. The non-sedating H(1) antagonist, terfenadine, also significantly reduced the scratching induced by the H(1) agonist, HTMT. Cimetidine (H(2) antagonist, 20 mg kg(-1), i.p.) did not affect histamine-induced scratching. These results indicate that activation of histamine H(4) receptors causes itch in mice, in addition to the previously recognised role for H(1) receptors in evoking itch. Histamine H(4) receptor antagonists therefore merit investigation as antipruritic agents.
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Affiliation(s)
- J K Bell
- Division of Neuroscience, College of Medicine, University of Edinburgh, Edinburgh, EH8 9JZ
| | - D S McQueen
- Division of Neuroscience, College of Medicine, University of Edinburgh, Edinburgh, EH8 9JZ
- Author for correspondence:
| | - J L Rees
- Department of Dermatology, University of Edinburgh, Edinburgh, EH3 9YW
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Hiruma H, Saito A, Kusakabe T, Takenaka T, Kawakami T. Neuropeptide Y inhibits axonal transport of particles in neurites of cultured adult mouse dorsal root ganglion cells. J Physiol 2002; 543:85-97. [PMID: 12181283 PMCID: PMC2290469 DOI: 10.1113/jphysiol.2002.020578] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Neuropeptide Y (NPY) plays a modulatory role in processing nociceptive information. The present study investigated the effects of NPY on axonal transport of particles in neurites of cultured adult dorsal root ganglion (DRG) cells using video-enhanced microscopy. Application of NPY decreased the number of particles transported in both the anterograde and retrograde directions. This effect was persistently observed during NPY application and was reversed after washout. The inhibitory effect of NPY was concentration dependent between 10(-9) M and 10(-6) M. The instantaneous velocity of individual particles moving in anterograde and retrograde directions was also reduced by NPY. Both the NPY Y1 receptor agonist [Leu31,Pro34]-NPY and NPY Y2 receptor agonist NPY(13-36) mimicked the effect of NPY on the number of transported particles. An immunocytochemical study using an antiserum against the NPY Y1 receptor protein revealed that the Y1 receptor was expressed in the majority (85.9 %) of cultured adult mouse DRG cells. Pre-treatment of cells with pertussis toxin, a GTP-binding protein (G protein) inhibitor, completely blocked the inhibitory effect of NPY. Each application of SQ-22536, an adenylate cyclase inhibitor, and H-89, a protein kinase A inhibitor, mimicked and occluded the effect of NPY. In contrast, dibutyryl cAMP (dbcAMP), a membrane permeable cAMP analogue, and forskolin, an activator of adenylate cyclase, produced a transient increase in axonal transport. The application of dbcAMP and forskolin in combination with NPY negated the effect of NPY alone. These results suggest that NPY, acting at Y1 and Y2 receptors, inhibits axonal transport of particles in sensory neurones. The effect seems to be mediated by a pertussis toxin-sensitive G protein, adenylate cyclase, and protein kinase A pathway. Therefore, NPY may be a modulatory factor for axonal transport in sensory neurones.
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Affiliation(s)
- Hiromi Hiruma
- Department of Physiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara 228-8555, Japan.
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