Abstract
Phentolamine injected intraventricularly in unanaesthetized rats decreased their locomotor activity and antagonized the excitatory effect of intraventricularly injected noradrenaline, or amphetamine injected s.c. Phentolamine did not influence the level of noradrenaline and 5-hydroxytryptamine in the rat brain. The mechanism of observed action of phentolamine is discussed.
Similar content being viewed by others
References
Benkert, O.: Measurement of hyperactivity in rats in a dose-response curve after intrahypothalamic norepinephrine injection. Life Sci. 8, 943–948 (1969).
Boissier, J. R., Simon, P., Guidicelli, J. F.: Effects centraux de quelques substances adrénoet/ou sympatholytiques. II. Action sur la motilité spontanée et potentialisation du pentobarbital. Arch. int. Pharmacodyn. 169, 312–319 (1967).
— — —: Effects centraux de quelques substances adrénoet/ou sympatholytiques. III. Ptosis, catalepsis, antagonisme vis-a-vis de l'apomorphine et de l'amphetamine. Arch. int. Pharmacodyn. 171, 68–80 (1968).
Brodie, B. B., Spector, S., Shore, P. A.: Interaction of drugs with norepinephrine in the rat brain. Pharmacol. Rev. 11, 548–564 (1959).
Dairman, W., Gordon, R., Spector, S., Sjoerdsma, A., Udenfriend, S.: Increased synthesis of catecholamines in the intact rat following administration of α-adrenergic blocking agents. Molec. Pharmacol. 4, 457–464 (1968).
Gagnon, D. J., Melville, K. I.: Alteration of centrally mediated cardiovascular manifestations by intraventricular pronethalol and phentolamine. Int. J. Neuropharmacol. 8, 587–592 (1969).
Galambos, E., Pfeifer, A. K., György, L., Molnár, J.: Study on the excitation induced by amphetamine, cocaine and α-methyltryptamine. Psychopharmacologia (Berl.) 11, 122–129 (1967).
Grunden, L. R.: Action of intracerebroventricular epinephrine on gross behavior, locomotor activity and hexobarbital sleeping times in rats. Int. J. Neuropharmacol. 8, 573–586 (1969).
—, Katzung, B. G.: Studies on the central action of large doses of epinephrine. Fed. Proc. 23, 455 (1969).
—, Marley, E.: Effects of sympathomimetic amines injected into the third cerebral ventricle in adult chickens. Neuropharmacology 9, 119–128 (1970).
Herman, Z. S.: The effects of noradrenaline on rat's behaviour. Psychopharmacologia (Berl.) 16, 369–374 (1970).
Johnson, E. S., Roberts, M. H. T., Sobieszek, A., Straughan, D. W.: Noradrenaline sensitive cells in rat cerebral cortex. Int. J. Neuropharmacol. 8, 549–566 (1969).
Kleinrok, Z., Jagiełło-Wójtowicz, E., Żebrowska-Łupina, I.: The action on phentolamine administered intraventricularly on the blood pressure in rats. Arch. int. Pharmacodyn. (in press) (1971).
Litchfield, J. T., Wilcoxon, F.: A simplified method of evaluating dose-effect experiments. J. Pharmacol. exp. Ther. 96, 99–113 (1949).
Maickel, R. P., Cox, R. H., Saillant, J., Miller, F. P.: A method for the determination of serotonin and norepinephrine in discrete areas of rat brain. Int. J. Neuropharmacol. 7, 275–281 (1968).
Palaic, D., Page, I. H., Khairallah, P. A.: Uptake and metabolism of 14C-serotonin in rat brain. J. Neurochem. 14, 63–69 (1967).
Tripod, J., Studer, A., Meier, R.: Essai de différenciation expérimentale d'une serie d'inhibiteurs du systeme nerveux central. Arch. int. Pharmacodyn. 112, 319–341 (1957).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kleinrok, Z., Żebrowska-Łupina, I. Central action of phentolamine administered intraventricularly in the rat. Psychopharmacologia 20, 348–354 (1971). https://doi.org/10.1007/BF00403566
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00403566