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Vavers E, Zvejniece L, Dambrova M. Sigma-1 receptor and seizures. Pharmacol Res 2023; 191:106771. [PMID: 37068533 PMCID: PMC10176040 DOI: 10.1016/j.phrs.2023.106771] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 04/03/2023] [Accepted: 04/13/2023] [Indexed: 04/19/2023]
Abstract
Over the last decade, sigma-1 receptor (Sig1R) has been recognized as a valid target for the treatment of seizure disorders and seizure-related comorbidities. Clinical trials with Sig1R ligands are underway testing therapies for the treatment of drug-resistant seizures, developmental and epileptic encephalopathies, and photosensitive epilepsy. However, the direct molecular mechanism by which Sig1R modulates seizures and the balance between excitatory and inhibitory pathways has not been fully elucidated. This review article aims to summarize existing knowledge of Sig1R and its involvement in seizures by focusing on the evidence obtained from Sig1R knockout animals and the anti-seizure effects of Sig1R ligands. In addition, this review article includes a discussion of the advantages and disadvantages of the use of existing compounds and describes the challenges and future perspectives on the use of Sig1R as a target for the treatment of seizure disorders.
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Affiliation(s)
- Edijs Vavers
- Latvian Institute of Organic Synthesis, Laboratory of Pharmaceutical Pharmacology, Aizkraukles 21, LV-1006, Riga, Latvia; University of Tartu, Faculty of Science and Technology, Institute of Chemistry, Ravila 14a, 50411, Tartu, Estonia.
| | - Liga Zvejniece
- Latvian Institute of Organic Synthesis, Laboratory of Pharmaceutical Pharmacology, Aizkraukles 21, LV-1006, Riga, Latvia
| | - Maija Dambrova
- Latvian Institute of Organic Synthesis, Laboratory of Pharmaceutical Pharmacology, Aizkraukles 21, LV-1006, Riga, Latvia; Riga Stradiņš University, Faculty of Pharmacy, Konsula 21, LV-1007, Riga, Latvia
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Taylor CP, Traynelis SF, Siffert J, Pope LE, Matsumoto RR. Pharmacology of dextromethorphan: Relevance to dextromethorphan/quinidine (Nuedexta®) clinical use. Pharmacol Ther 2016; 164:170-82. [PMID: 27139517 DOI: 10.1016/j.pharmthera.2016.04.010] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dextromethorphan (DM) has been used for more than 50years as an over-the-counter antitussive. Studies have revealed a complex pharmacology of DM with mechanisms beyond blockade of N-methyl-d-aspartate (NMDA) receptors and inhibition of glutamate excitotoxicity, likely contributing to its pharmacological activity and clinical potential. DM is rapidly metabolized to dextrorphan, which has hampered the exploration of DM therapy separate from its metabolites. Coadministration of DM with a low dose of quinidine inhibits DM metabolism, yields greater bioavailability and enables more specific testing of the therapeutic properties of DM apart from its metabolites. The development of the drug combination DM hydrobromide and quinidine sulfate (DM/Q), with subsequent approval by the US Food and Drug Administration for pseudobulbar affect, led to renewed interest in understanding DM pharmacology. This review summarizes the interactions of DM with brain receptors and transporters and also considers its metabolic and pharmacokinetic properties. To assess the potential clinical relevance of these interactions, we provide an analysis comparing DM activity from in vitro functional assays with the estimated free drug DM concentrations in the brain following oral DM/Q administration. The findings suggest that DM/Q likely inhibits serotonin and norepinephrine reuptake and also blocks NMDA receptors with rapid kinetics. Use of DM/Q may also antagonize nicotinic acetylcholine receptors, particularly those composed of α3β4 subunits, and cause agonist activity at sigma-1 receptors.
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Affiliation(s)
| | - Stephen F Traynelis
- Dept. of Pharmacology, Emory University School of Medicine, Atlanta, GA, USA
| | - Joao Siffert
- Avanir Pharmaceuticals, Inc., Aliso Viejo, CA, USA
| | - Laura E Pope
- Avanir Pharmaceuticals, Inc., Aliso Viejo, CA, USA
| | - Rae R Matsumoto
- College of Pharmacy, Touro University California, Vallejo, CA, USA
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Lee SD, Nakano H, Farkas GA. NMDA receptor-mediated modulation of ventilation in obese Zucker rats. Int J Obes (Lond) 2001; 25:997-1004. [PMID: 11443498 DOI: 10.1038/sj.ijo.0801663] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2000] [Revised: 01/22/2001] [Accepted: 02/06/2001] [Indexed: 11/08/2022]
Abstract
BACKGROUND Ventilation in response to hypoxia is reduced in some obese humans and is believed to represent part of the pathogenesis of obesity hypoventilation syndrome (OHS). Ventilation in response to hypoxic exposure is closely related to the release of excitatory neurotransmitters, in particular glutamate, acting specifically on N-methyl-D-aspartate (NMDA) receptors. OBJECTIVES The aim of the present study was to investigate whether NMDA receptor-mediated mechanisms are responsible for the altered ventilatory response to sustained hypoxia observed in obese Zucker (Z) rats. SUBJECTS Seven lean and seven 15-week-old obese male Z rats were studied. MEASUREMENTS Ventilation ([V](E)) at rest and during 30 min sustained hypoxic (10% O(2)) exposure was measured by the barometric method. [V](E) was assessed following the blinded-random administration of equal volumes of either saline (vehicle) or dextromethorphan (DM, 10 mg/kg), a non-competitive glutamate NMDA receptor antagonist. RESULTS DM had no effects on resting [V(E) in both lean and obese rats during room air breathing. Lean rats treated with DM exhibited a significant (P<0.05) depression in [V](E), V(T), and V(T)/T(I) during either the early (5 min) or the late phase (30 min) of ventilatory response to sustained hypoxia. In contrast, DM administration in obese rats did not change [V(E), V(T), or V(T)/T(I) during the early phase of ventilatory response to hypoxia. During the late phase of ventilatory response to hypoxia. obese rats treated with DM exhibited a similar depression in [V](E) and V(T) as observed in lean rats, but had no significant change in V(T)/T(I) during the 30 min hypoxic exposure. CONCLUSION Our findings indicate that altered glutamatergic mechanisms acting on NMDA receptors are partially responsible for a blunted early phase of ventilatory response to hypoxia noted in obese rats and also contribute to their reduced neural respiratory drive.
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Affiliation(s)
- S D Lee
- Department of Physical Therapy, Exercise, and Nutrition Science, University at Buffalo, The State University of New York, Buffalo, New York 14214-3079, USA
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Schlenker E. Gender-specific effects of CNQX administered into the arcuate nucleus on ventilatory patterns in rats. RESPIRATION PHYSIOLOGY 1999; 116:133-43. [PMID: 10487299 DOI: 10.1016/s0034-5687(99)00044-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study evaluated the effect of microinjection of the non-N-methyl-D-aspartate (NMDA) receptor antagonist, cyano, 3-dihydro-7-nitrogluinoxaline-2, 3-dione (CNQX), into the arcuate nucleus of the hypothalamus on ventilation in male and female rats. Conscious rats received saline or 50, 100, or 200 pmol concentrations of CNQX on separate days. Significant interactions between dose and gender were observed on frequency, inspiratory (TI) and expiratory (TE) time, and tidal volume. CNQX depressed frequency, but increased tidal volume in female rats. Effects of CNQX in males on these ventilatory parameters were considerably less. In CNQX-treated females the decrease in frequency of breathing was primarily due to an increase in TI. Exposure of CNQX-treated female rats to hypercapnia, but not to hypoxia transiently decreased TI. No effect of CNQX was noted on oxygen consumption or body temperature. Thus, non-NMDA receptors in the arcuate nucleus are involved in modulating ventilatory patterns in a gender-specific manner independent of its effects on oxygen consumption or body temperature.
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Affiliation(s)
- E Schlenker
- Division of Basic Biomedical Science, University of South Dakota, School of Medicine, Vermillion 57069-2390, USA.
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Dematteis M, Lallement G, Mallaret M. Dextromethorphan and dextrorphan in rats: common antitussives--different behavioural profiles. Fundam Clin Pharmacol 1998; 12:526-37. [PMID: 9794151 DOI: 10.1111/j.1472-8206.1998.tb00982.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dextromethorphan (DM), a widely used and well-tolerated centrally acting antitussive, has been tested in several clinical trials for its antiepileptic and neuroprotective properties. However, the use of DM in these new clinical indications requires higher doses than antitussive doses, which may therefore induce phencyclidine (PCP)-like side-effects (memory and psychotomimetic disturbances) through its metabolic conversion to the active metabolite dextrorphan (DX), a more potent PCP-like non-competitive antagonist at the N-methyl-D-aspartate (NMDA) receptor than DM. Thus, we compared the behavioural effects in rats of intraperitoneal administration of DM and DX on motor activity in an open field and on learning and memory in the Morris water maze. DM (20, 30, 40 mg/kg) produced a dose-dependent decrease in both locomotion and stereotyped behaviour with a slight ataxia for the highest dose. DX (20, 30, 40 mg/kg) induced a dose-dependent increase in locomotion and stereotypies (swaying, turning) with moderate ataxia. Assessments of learning and memory were performed with lower doses of DM (10, 20, 30 mg/kg) and DX (5, 10, 15 mg/kg) because of motivational deficits (40 mg/kg of DM, 20-40 mg/kg of DX) and motor disorders (30, 40 mg/kg of DX) in the cue learning procedure. DX (10, 15 mg/kg) impaired spatial learning with a long-lasting effect for the highest dose whereas 5 mg/kg of DX and DM (10-30 mg/kg) did not. Only 15 mg/kg of DX appeared to slightly impair working memory. DM (10-30 mg/kg) and DX (5-15 mg/kg) did not impair reference memory. Thus, the two antitussives DM and DX induced different behavioural effects suggesting sedative effects for DM and PCP-like effects for DX. However, PCP-like side-effects with DM remain possible through its metabolic conversion to DX, with very high doses and/or in extensive metabolizers and/or in aged subjects prone to cognitive dysfunction. Therefore, the identification of DM metabolism phenotype, an adapted prescription and a pharmacological modulation of the DM metabolism may avoid adverse effects.
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Affiliation(s)
- M Dematteis
- Unité de Neuropharmacologie, CRSSA, La Tronche, France
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Abstract
Subcutaneous administration of aspartic acid results in a long-lasting but reversible depression of ventilation in male but not in female rats. Aspartic acid acts on N-methyl-D-aspartate receptors. The present study tested the hypothesis that a noncompetitive N-methyl-D-aspartate-receptor antagonist, dextromethorphan (Dex), would depress ventilation in female rats and stimulate it in male rats. Moreover, Dex administered prior to aspartic acid should prevent the aspartic acid-induced depression of ventilation in male rats. In female rats, Dex caused a 30% depression of ventilation relative to saline at 5 and 10 mg/kg (P < 0.01) but not at the highest dose (20 mg/kg). In male rats, Dex had no effect on ventilation. At a dose of 20 mg/kg, Dex depressed oxygen consumption to 50% of the saline value at all time points in female rats (P < 0.001) and in male rats 45 and 60 min after administration. The time points when Dex depressed ventilation and oxygen consumption were different in female rats, suggesting that the depression of ventilation was not the result of a depression in oxygen consumption. During a hypercapnic challenge (7% CO2), female rats treated with 5 and 10 mg/kg of Dex exhibited a smaller increase in ventilatory response relative to saline treatment. At a dose of 20 mg/kg, the hypercapnic responsiveness of male rats was markedly stimulated (85.8 +/- 8.95 ml/min) relative to saline (50.6 +/- 9.14 ml/min; P < 0.001). Finally, Dex administered before aspartic acid prevented the aspartic acid-induced depression of ventilation in male rats. Thus, in rats, Dex has gender-specific effects on ventilation and these effects are not associated with changes in oxygen consumption.
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Affiliation(s)
- E H Schlenker
- Department of Physiology and Pharmacology, University of South Dakota School of Medicine, Vermillion 57069, USA
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Manning BH, Mao J, Frenk H, Price DD, Mayer DJ. Continuous co-administration of dextromethorphan or MK-801 with morphine: attenuation of morphine dependence and naloxone-reversible attenuation of morphine tolerance. Pain 1996; 67:79-88. [PMID: 8895234 DOI: 10.1016/0304-3959(96)81972-5] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
N-Methyl-D-aspartate (NMDA) receptor antagonists have been repeatedly shown to attenuate the development of opiate tolerance and dependence in rodents. In the present experiments, continuous subcutaneous infusion of either MK-801 (0.01 mg/kg/h but not 0.005 mg/kg/h) or DM (0.133, 0.67 and 1.33 mg/kg/h) reliably prolonged the antinociceptive effect of continuous subcutaneous infusion of morphine sulfate (2.0 mg/kg/h), indicating attenuation of the development of morphine tolerance. Furthermore, this prolonged antinociception was completely reversible by naloxone (10 mg/kg, i.p.). Doses of MK-801 and DM that were equipotent in attenuating morphine tolerance (0.01 mg/kg/h and 1.33 mg/kg/h, respectively) revealed different profiles of effects, however, on locomotor activity and naloxone-precipitated abstinence/withdrawal symptoms. With regard to locomotor activity, rats having received continuous (48 h) subcutaneous infusion of morphine sulfate and MK-801, but not rats having received morphine sulfate and DM, displayed a reliable and striking increase in locomotor activity as compared with rats having received morphine alone. With regard to naloxone-precipitated withdrawal symptoms, continuous (48 h) subcutaneous co-infusion of either MK-801 (0.01 mg/kg/h) or DM (1.33 mg/kg/h) with morphine attenuated naloxone-precipitated hyperalgesia as compared with rats infused with morphine alone. MK-801 (0.01 mg/kg/h) was more effective than DM (0.133, 0.67, or 1.33 mg/kg/h), however, in reducing other naloxone-precipitated withdrawal symptoms (teeth chattering, jumping and wet dog shakes). The effects of MK-801 on all withdrawal symptoms were confounded, however, by the appearance of flaccidity following naloxone administration to rats having received MK-801 and morphine. These results extend previous observations by showing that the prolonged antinociception observed following co-administration of morphine and an NMDA antagonist is completely naloxone-reversible, supporting the notion that this antinociception reflects prolongation of an opioid receptor-mediated effect. The different profiles of side effects associated with MK-801 and DM, however, suggest that (1) attenuation of naloxone-precipitated withdrawal symptoms by MK-801 may be an artifact of toxicity, and (2) DM may prove clinically useful for the prevention of morphine tolerance, given its lack of observable side effects when administered concurrently with morphine to rodents.
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Affiliation(s)
- Barton H Manning
- Department of Anatomy, Medical College of Virginia, Virginia Commonwealth University,Richmond Virginia,USA Department of Anesthesiology, Medical College of Virginia, Virginia Commonwealth University,Richmond, Virginia,USA Department of Psychology, Tel Aviv University,Ramat Aviv,Israel
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Elliott K, Hynansky A, Inturrisi CE. Dextromethorphan attenuates and reverses analgesic tolerance to morphine. Pain 1994; 59:361-368. [PMID: 7708410 DOI: 10.1016/0304-3959(94)90022-1] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Tolerance to the antinociceptive (analgesic) effect of morphine, a mu-opioid agonist, was developed in male CD-1 mice as assessed by a shift to the right of the analgesic (tail-flick) dose-response curves and an increase in the ED50 values. Administration of dextromethorphan at 30 mg/kg s.c., but not saline, 30 min prior to an escalating 3 times per day (t.i.d.) morphine dosing schedule prevented a 5-fold increase in the morphine ED50 value observed on treatment day 4. Concurrent administration of dextromethorphan at 12 mg/kg/24 h by s.c. infusion prevented the 6-fold increase in the morphine ED50 value that was observed in control mice that received morphine at 30 mg/kg/24 h by s.c. infusion. Implantation of two 25 mg morphine pellets resulted in a 10-fold increase in the morphine ED50 value on treatment day 4. Administration of dextromethorphan at 30 mg/kg s.c. t.i.d., but not saline, resulted in a reversal of morphine tolerance with the almost complete return of the morphine ED50 value to the control (opioid naive) value. These results demonstrate that dextromethorphan, an NMDA receptor antagonist can modulate morphine (mu-receptor)-mediated tolerance.
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Affiliation(s)
- Kathryn Elliott
- Department of Pharmacology, Cornell University Medical College, New York, NY 10021 USA
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Krug M, Matthies R, Wagner M, Brödemann R. Non-opioid antitussives and methadone differentially influence hippocampal long-term potentiation in freely moving rats. Eur J Pharmacol 1993; 231:355-61. [PMID: 8449228 DOI: 10.1016/0014-2999(93)90110-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Long-term potentiation (LTP) of monosynaptically evoked field potentials (MEFP) in the dentate gyrus of freely moving rats following tetanization of the perforant pathway was investigated after peripheral application of substances which have been shown to influence NMDA receptor-mediated effects (dextromethorphan, methadone) as well as structurally related substances with similar antitussive effects (codeine, normethadone). The noncompetitive NMDA receptor antagonist MK 801 was also tested for comparison. Whereas under control conditions the field e.p.s.p. (excitatory postsynaptic potential) and the population spike of the MEFP were largely uninfluenced by these substances, different effects were seen after the induction of LTP. MK 801 (0.2 mg/kg i.p.) suppressed the induction of LTP of both the field e.p.s.p. and the population spike. Dextromethorphan (40 mg/kg i.p.) also prevented the potentiation of the field e.p.s.p. and the population spike, thus resembling MK 801 in its effect. Codeine (20 mg/kg i.p.), the levorotatory structural analogue of dextromethorphan had no effect. Methadone and normethadone did not influence the potentiation of the field e.p.s.p. or interfere with the induction of potentiation of the population spike but depressed its maintenance. The results obtained with MK 801 confirm those reported by others. Comparison of the effects of dextromethorphan with those of MK 801, suggests that there is a direct interaction with the NMDA receptor-ionophore complex. The effects of methadone and normethadone appear not to be linked to an interaction with opioid receptors, since naloxone did not influence the suppression of LTP caused by methadone. The possibility of interference with the NMDA receptor-ionophore complex is discussed.
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Affiliation(s)
- M Krug
- Institute of Pharmacology and Toxicology, Medical Academy Magdeburg, Germany
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Kamei J, Iwamoto Y, Kawashima N, Hitosugi H, Misawa M, Kasuya Y. Involvement of haloperidol-sensitive sigma-sites in antitussive effects. Eur J Pharmacol 1992; 224:39-43. [PMID: 1451741 DOI: 10.1016/0014-2999(92)94815-d] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The effects of selective sigma-ligands on the capsaicin-induced cough reflex in rats were studied. Intraperitoneal injection of (+)-N-allylnormetazocine ((+)-SKF-10,047) and N,N'-di(ortho-tolyl)guanidine (DTG) in doses that ranged from 0.3 to 3.0 mg/kg decreased the number of coughs dose dependently. The antitussive effects of these sigma-ligands were significantly attenuated by pretreatment with haloperidol. Pretreatment with haloperidol also markedly reduced the antitussive effects of (+/-)-pentazocine and dextromethorphan. These results suggest that haloperidol-sensitive sigma-sites may be involved in the regulation of coughs.
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Affiliation(s)
- J Kamei
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Hoshi University, Tokyo, Japan
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Canoll PD, Smith PR, Musacchio JM. Ropizine concurrently enhances and inhibits [3H]dextromethorphan binding to different structures of the guinea pig brain: autoradiographic evidence for multiple binding sites. Life Sci 1990; 46:PL9-16. [PMID: 2345483 DOI: 10.1016/0024-3205(90)90341-n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Ropizine (10 microM) produces a simultaneous enhancement and inhibition of [3H]dextromethorphan (DM) high-affinity binding to different areas of the guinea pig brain. These results imply that there are two distinct types of high-affinity [3H]DM binding sites, which are present in variable proportions in different brain structures. The ropizine-enhanced [3H]DM binding type was preferentially inhibited by (+)-pentazocine. This is consistent with the presumption that the (+)-pentazocine-sensitive site is identical with the common site for DM and 3-(-3-Hydroxyphenyl)-N-(1-propyl)piperidine ((+)-3-PPP). The second binding type, which is inhibited by ropizine and is not so sensitive to (+)-pentazocine, has not been fully characterized. This study demonstrates that the biphasic effects of ropizine are due, at least in part, to the effects of ropizine on two different types of [3H]DM binding sites. However, this study does not rule out that common DM/(+)-3-PPP site also might be inhibited by higher concentrations of ropizine.
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Affiliation(s)
- P D Canoll
- Department of Pharmacology, N. Y. U. Medical Center, NY 10016
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Abstract
There is increasing evidence that sigma ligands and dextromethorphan (DM) bind to at least one common high-affinity site. DM and other antitussives do not produce psychotomimetic effects. This suggested that sigma ligands may produce their characteristic effects through another site, and prompted us to review critically the literature on the side effects of sigma opiates. Contrary to what is generally accepted, the dysphoric and psychotomimetic side effects of sigma opiates are mediated by the levo-and not by the dextrorotatory isomers. Moreover, these effects are unequivocally naloxone-reversible. Therefore, the current version of the "sigma receptor", with high affinity for the dextrorotatory sigma opiates, cannot explain the psychotomimetic effects of the levorotatory enantiomers. Thus, neither the "sigma ligands" nor its newly defined "receptor" are involved in the psychotomimetic effects of sigma opiates. Further experimentation with more selective drugs and with a combination of different methods will be necessary to identify the different binding sites, and to establish their physiological role and therapeutic potential.
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Affiliation(s)
- J M Musacchio
- Department of Pharmacology, N.Y.U. Medical Center, NY 10016
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