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  • 1 S.V. Anichkov Department of Neuropharmacology; Institute of Experimental Medicine of the Russian Academy of Medical Sciences 197376 St. Petersburg, Pavlov Street 12, Russia
  • 2 Neurophysiology Research Group of the Hungarian Academy of Sciences at Institute of Physiology Pécs University Medical School, Pécs, Hungary
  • 3 Neurophysiology Research Group of the Hungarian Academy of Sciences at Institute of Physiology Pécs University Medical School, Pécs, Hungary
  • 4 Institute of Experimental Medicine of the Russian Academy of Medical Sciences St. Petersburg, Russia
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The purpose of this work was to study the role of 5-HT1A receptors on the level of anxiety in adult intact and ovariectomized (OVX) female rats. The influence of chronic administration of 5-HT1A receptor agonist 8-OH-DPAT (0.05 mg/kg, s.c.) and 5-HT1A receptor antagonist NAN-190 (0.1 mg/kg, i.p.) given for 14 days alone or in combination with 17µ-estradiol (0.5 µg i.m./rat/day) was studied on behavior in the elevated plus maze. In intact females administration of NAN-190 resulted in significant increase in the number of enterings and the time spent on the open arms in every phase of the estrous cycle, however, 8-OH-DPAT failed to modify these parameters. In OVX females 8-OH-DPAT alone or in combination with 17µ-estradiol significantly increased the number of enterings and time spent on the open arms. On the contrary, NAN-190 alone or in combination with 17µ-estradiol in OVX females failed to evoke behavioral changes in the elevated plus maze. Thus, the 5-HT1A receptor antagonist NAN-190 induced anxiolytic effect in intact female rats, while 5-HT1A receptor agonist 8-OH-DPAT produced an anxiolytic profile on OVX rats. Results of this work specify the involvement of 5-HT1A receptors in behavioral mechanisms of anxiety in OVX female rats.

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