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Abstract:

Nicotinic acetylcholine (nACh) receptors are known to be targets for modulation by a number of substances, including the opiates. It is known that acetylcholine (ACh) coexists with opioid peptides in cochlear efferent neurons, and such a colocalization has been proposed for the vestibular system. In the present study we test the hypothesis that morphine, an opioid receptor agonist with a broad spectrum of selectivity, modulates α9nACh receptor-mediated responses in frog vestibular hair cells. Morphine dose-dependently and reversibly inhibited ACh-induced currents as recorded by the perforated patch-clamp method. In the presence of morphine the ACh dose-response curve was shifted to the right in a parallel fashion, suggesting a competitive interaction. However, naloxone did not antagonize the inhibition produced by morphine. To test the hypothesis that morphine could interact with the α9nACh receptor without the involvement of opioid receptors, experiments were performed using Xenopus laevis oocytes injected with the α9nACh receptor cRNA. The currents activated by ACh in Xenopus oocytes, a system that lacks opioid receptors, were also dose-dependently inhibited by morphine. We conclude that morphine inhibits the α9nACh receptor-mediated response in hair cells and Xenopus oocytes through a mechanism which does not involve opioid receptors but may be a direct block of the α9nACh receptor. Copyright (C) 2000 Elsevier Science B.V.

Registro:

Documento: Artículo
Título:Morphine inhibits an α9-acetylcholine nicotinic receptor-mediated response by a mechanism which does not involve opioid receptors
Autor:Lioudyno, M.I.; Verbitsky, M.; Holt, J.C.; Elgoyhen, A.B.; Guth, P.S.
Filiación:Department of Pharmacology, Tulane University School of Medicine, 1430 Tulane Ave., New Orleans, LA 70112, United States
Pavlov Institute of Physiology RAS, Nab. Makarova 6, St. Petersburg, Russian Federation
Instituto De Investigaciones En Ingeniería Genética Y Biología Molecular, Vuelta de Obligado 2490, Buenos Aires 1428, Argentina
Palabras clave:Efferent; Hair cell; Interaction; Morphine; nACh receptor; Vestibular system; morphine; nicotinic receptor; opiate receptor; acetylcholine; Chrna9 protein, mouse; morphine; naloxone; narcotic agent; narcotic antagonist; nicotinic receptor; animal cell; animal experiment; article; controlled study; efferent nerve; frog; hair cell; nonhuman; patch clamp; priority journal; receptor blocking; vestibular nervous system; Xenopus laevis; animal; drug effect; electric conductivity; hair cell; metabolism; oocyte; physiology; Acetylcholine; Animals; Electric Conductivity; Hair Cells; Morphine; Naloxone; Narcotic Antagonists; Narcotics; Oocytes; Rana pipiens; Receptors, Nicotinic; Xenopus laevis
Año:2000
Volumen:149
Número:1-2
Página de inicio:167
Página de fin:177
DOI: http://dx.doi.org/10.1016/S0378-5955(00)00180-5
Título revista:Hearing Research
Título revista abreviado:Hear. Res.
ISSN:03785955
CODEN:HERED
CAS:Acetylcholine, 51-84-3; Chrna9 protein, mouse; Morphine, 57-27-2; Naloxone, 465-65-6; Narcotic Antagonists; Narcotics; Receptors, Nicotinic
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03785955_v149_n1-2_p167_Lioudyno

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Citas:

---------- APA ----------
Lioudyno, M.I., Verbitsky, M., Holt, J.C., Elgoyhen, A.B. & Guth, P.S. (2000) . Morphine inhibits an α9-acetylcholine nicotinic receptor-mediated response by a mechanism which does not involve opioid receptors. Hearing Research, 149(1-2), 167-177.
http://dx.doi.org/10.1016/S0378-5955(00)00180-5
---------- CHICAGO ----------
Lioudyno, M.I., Verbitsky, M., Holt, J.C., Elgoyhen, A.B., Guth, P.S. "Morphine inhibits an α9-acetylcholine nicotinic receptor-mediated response by a mechanism which does not involve opioid receptors" . Hearing Research 149, no. 1-2 (2000) : 167-177.
http://dx.doi.org/10.1016/S0378-5955(00)00180-5
---------- MLA ----------
Lioudyno, M.I., Verbitsky, M., Holt, J.C., Elgoyhen, A.B., Guth, P.S. "Morphine inhibits an α9-acetylcholine nicotinic receptor-mediated response by a mechanism which does not involve opioid receptors" . Hearing Research, vol. 149, no. 1-2, 2000, pp. 167-177.
http://dx.doi.org/10.1016/S0378-5955(00)00180-5
---------- VANCOUVER ----------
Lioudyno, M.I., Verbitsky, M., Holt, J.C., Elgoyhen, A.B., Guth, P.S. Morphine inhibits an α9-acetylcholine nicotinic receptor-mediated response by a mechanism which does not involve opioid receptors. Hear. Res. 2000;149(1-2):167-177.
http://dx.doi.org/10.1016/S0378-5955(00)00180-5