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5,7-DHT facilitated lordosis: effects of 5-HT agonists
M Aiello-Zaldivar1, V Luine, M Frankfurt
1Department of Psychology, Hunter College of CUNY 10021.
Abstract:
The role of 5-HT (serotonin) in regulating lordosis was investigated by combining peripheral administration of the 5-HT agonists 8-OH-DPAT (8-hydroxy-2-[di-N-propylamino]tetralin) or TFMPP (1-[m-trifluoromethylphenyl]piperazine), with intrahypothalamic application of the 5-HT neurotoxin 5,7-DHT (5,7-dihydroxytryptamine). The 5-HT1A agonist, 8-OH-DPAT, significantly inhibited lordosis in 5,7-DHT-treated and non-treated rats. TFMPP, an agonist at 5-HT1B and 5-HT1C receptors, significantly facilitated lordosis in 5,7-DHT-treated and non-treated rats. Our results show that both inhibitory and facilitatory influences of hypothalamic 5-HT on lordosis, are modulated via postsynaptic receptors.
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