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Anxiolytic and panicolytic effects of escitalopram in the elevated T-maze.
J Psychopharmacol. 2008 Mar; 22(2):132-7.JP

Abstract

Escitalopram is a highly selective inhibitor of serotonin re-uptake that is used to treat anxiety disorders. In the present study, we investigated the effects of acute, sub-chronic (14 days) and chronic (21 days) administration of escitalopram (2, 4 and 8 mg/kg, PO) on the performance of rats in the elevated T-maze. For comparison, imipramine (15 mg/kg, PO) was also studied. The apparatus is made of three elevated arms of equal dimension, one enclosed transversal to the two open arms. Inhibitory avoidance of the open arms, trained in the enclosed arm, has been related to generalised anxiety disorder, while one-way escape from one open arm, to panic disorder. After acute administration, the three doses of escitalopram impaired avoidance (anxiolytic effect), while imipramine was ineffective. Escape was unaffected by either drug. With subchronic administration, both drugs were ineffective on either avoidance or escape. After chronic treatment, avoidance was impaired by imipramine and by the two highest doses of escitalopram. In addition, escape was impaired (panicolytic effect) by imipramine and by the highest dose of escitalopram. Locomotion measured in a square arena was increased by the three doses of escitalopram, given chronically. Therefore, both imipramine and escitalopram had anxiolytic and panicolytic-like effects after chronic administration, but acutely only escitalopram decreased anxiety. Since no such effect was observed following subchronic administration, it is likely that the mechanisms of the early and late anxiolytic actions of escitalopram are different.

Authors+Show Affiliations

Division of Psychiatry, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18208911

Citation

Pinheiro, S N., et al. "Anxiolytic and Panicolytic Effects of Escitalopram in the Elevated T-maze." Journal of Psychopharmacology (Oxford, England), vol. 22, no. 2, 2008, pp. 132-7.
Pinheiro SN, Del-Ben CM, Zangrossi H, et al. Anxiolytic and panicolytic effects of escitalopram in the elevated T-maze. J Psychopharmacol. 2008;22(2):132-7.
Pinheiro, S. N., Del-Ben, C. M., Zangrossi, H., & Graeff, F. G. (2008). Anxiolytic and panicolytic effects of escitalopram in the elevated T-maze. Journal of Psychopharmacology (Oxford, England), 22(2), 132-7. https://doi.org/10.1177/0269881107079866
Pinheiro SN, et al. Anxiolytic and Panicolytic Effects of Escitalopram in the Elevated T-maze. J Psychopharmacol. 2008;22(2):132-7. PubMed PMID: 18208911.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Anxiolytic and panicolytic effects of escitalopram in the elevated T-maze. AU - Pinheiro,S N, AU - Del-Ben,C M, AU - Zangrossi,H,Jr AU - Graeff,F G, Y1 - 2008/01/21/ PY - 2008/1/23/pubmed PY - 2008/8/19/medline PY - 2008/1/23/entrez SP - 132 EP - 7 JF - Journal of psychopharmacology (Oxford, England) JO - J Psychopharmacol VL - 22 IS - 2 N2 - Escitalopram is a highly selective inhibitor of serotonin re-uptake that is used to treat anxiety disorders. In the present study, we investigated the effects of acute, sub-chronic (14 days) and chronic (21 days) administration of escitalopram (2, 4 and 8 mg/kg, PO) on the performance of rats in the elevated T-maze. For comparison, imipramine (15 mg/kg, PO) was also studied. The apparatus is made of three elevated arms of equal dimension, one enclosed transversal to the two open arms. Inhibitory avoidance of the open arms, trained in the enclosed arm, has been related to generalised anxiety disorder, while one-way escape from one open arm, to panic disorder. After acute administration, the three doses of escitalopram impaired avoidance (anxiolytic effect), while imipramine was ineffective. Escape was unaffected by either drug. With subchronic administration, both drugs were ineffective on either avoidance or escape. After chronic treatment, avoidance was impaired by imipramine and by the two highest doses of escitalopram. In addition, escape was impaired (panicolytic effect) by imipramine and by the highest dose of escitalopram. Locomotion measured in a square arena was increased by the three doses of escitalopram, given chronically. Therefore, both imipramine and escitalopram had anxiolytic and panicolytic-like effects after chronic administration, but acutely only escitalopram decreased anxiety. Since no such effect was observed following subchronic administration, it is likely that the mechanisms of the early and late anxiolytic actions of escitalopram are different. SN - 0269-8811 UR - https://www.unboundmedicine.com/medline/citation/18208911/Anxiolytic_and_panicolytic_effects_of_escitalopram_in_the_elevated_T_maze_ DB - PRIME DP - Unbound Medicine ER -