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BioMed Research International
Volume 2014 (2014), Article ID 847821, 8 pages
http://dx.doi.org/10.1155/2014/847821
Research Article

Effects of SCH-23390 in Combination with a Low Dose of 17β-Estradiol on Anxiety-Like Behavior in Ovariectomized Rats

Laboratory of Neuroendocrinology, I. P. Pavlov Institute of Physiology of the Russian Academy of Science, 6 Emb. Makarova, Saint Petersburg 199034, Russia

Received 25 April 2013; Revised 29 December 2013; Accepted 19 January 2014; Published 23 February 2014

Academic Editor: George Perry

Copyright © 2014 Julia Fedotova. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to explore effects on anxiety-like behavior of D1 dopamine receptor agonist, SKF-38393, and of D1 dopamine receptor antagonist, SCH-23390, given alone or in combination with a low dose of 17β-estradiol (17β-E2) to ovariectomized (OVX) rats. Two weeks after surgery, OVX rats began 14 days of treatment with the vehicle, a low dose of 17β-E2 (5.0 μg/rat, s.c.), SKF-38393 (0.1 mg/kg, i.p.), SCH-23390 (0.1 mg/kg, i.p.), SKF-38393 plus 17β-E2, or SCH-23390 plus 17β-E2. The animals were tested in the black and white model (BWM) and the open field test (OFT). SCH-23390 (0.1 mg/kg, i.p.) alone or in a combination with a low dose of 17β-E2 (5.0 μg/rat, s.c.) resulted in anxiolytic-like effect in OVX rats in the BWM. Repeated treatment with SCH-23390 and 17β-E2 profoundly increased anxiolytic-like effect of single substances exerted per se. Coadministration of SCH-23390 with 17β-E2 increased frequency of rearing and grooming in OVX rats in OFT. SKF-38393 (0.1 mg/kg, i.p.) treatment failed to alter anxiety-like behavior in OVX rats in the BWM. The results of the present study suggest that 17β-E2 and SCH-23390 interact to exert anxiolytic-like action and that each of these drugs can potentiate effects of each other.