caa a22 4500 465738044 CHVBK 20180323111800.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF02244064 doi (NATIONALLICENCE)springer-10.1007/BF02244064 On the possible involvement of glutamate receptors in conditioning of behavioural effects of apomorphine [Elektronische Daten] [S. Welsch-Kunze, K. Kuschinsky] It was shown previously that behavioural effects of apomorphine (locomotor activation and stereotyped behaviour) can be conditioned when they are associated with well-defined environmental stimuli. In the present study, the hypothesis was tested that glutamatergic mechanisms play an important role either in formation of conditioned responses to apomorphine or in the expression of previously established conditioned responses. For this purpose, two blockers of glutamate receptors were applied, either MK-801 (dizocilpine), a non-competitive, but selective blocker of NMDA-type receptors or MLV-6976, a non-selective blocker of glutamate receptors. MK-801 produced some locomotor activation by itself in a dose-dependent way (0.125-0.50 mg/kg ip). The locomotor activation produced by 0.25 mg/kg could not be conditioned. When rats were conditioned 9 times with 2 mg/kg apomorphine after pretreatment with 0,25 mg/kg of MK-801, this pretreatment did not prevent the development of apomorphine-conditioned locomotor activity or stereotypies which appeared when the rats were treated with saline in presence of the conditioned stimuli. Similar results were obtained when rats were conditioned 7 times with the same dose of apomorphine after pretreatment with 20 mg/kg ip MLV-6976, which drug did not induce any visible alterations in motility by itself. When rats were conditioned 7 times with 2 mg/kg apomorphine alone and tested with MK-801 (0.25 mg/kg) in the presence of the conditioned stimuli, neither locomotor activity nor stereotypies appeared as conditioned responses. When rats were conditioned with the same dose of apomorphine alone and tested with MLV-6976 (20 mg/kg ip), stereotypies did not appear as conditioned responses, but some locomotor activity occurred. The results suggest that glutamatergic mechanisms are not relevant for the development of conditioned responses to apomorphine, but might be of some relevance for the expression of previously established conditioned responses. Springer-Verlag, 1990 Conditioning nationallicence Apomorphine nationallicence Locomotor activation nationallicence Stereotyped behaviour nationallicence Glutamate nationallicence Welsch-Kunze S. Institute of Pharmacology and Toxicology, Faculty of Pharmacy, University of Marburg, D-3550, Marburg, Federal Republic of Germany aut Kuschinsky K. Institute of Pharmacology and Toxicology, Faculty of Pharmacy, University of Marburg, D-3550, Marburg, Federal Republic of Germany aut Psychopharmacology Springer-Verlag 101/3(1990-07-01), 421-428 0033-3158 101:3<421 1990 101 213 https://doi.org/10.1007/BF02244064 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02244064 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Welsch-Kunze S. Institute of Pharmacology and Toxicology, Faculty of Pharmacy, University of Marburg, D-3550, Marburg, Federal Republic of Germany aut NATIONALLICENCE 700 1- Kuschinsky K. Institute of Pharmacology and Toxicology, Faculty of Pharmacy, University of Marburg, D-3550, Marburg, Federal Republic of Germany aut NATIONALLICENCE 773 0- Psychopharmacology Springer-Verlag 101/3(1990-07-01), 421-428 0033-3158 101:3<421 1990 101 213 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer