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The effects of 5,7-dihydroxytryptamine lesions of extrapyramidal and mesolimbic sites on spontaneous motor behaviour, and amphetamine-induced stereotypy

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Summary

5,7-Dihydroxytryptamine lesions of the nucleus accumbens septi, or substantia nigra, resulted in a twofold increase in spontaneous locomotor activity. Striatal 5HT depletion also raised basal activity levels, as well as increasing rearing behaviour in an open field. The stereotyped responses to all doses of amphetamine tested (2.5–10 mg/kg, i.p.) were enhanced by lesions of the nucleus accumbens or substantia nigra. Striatal lesions only affected the response to the lowest dose of amphetamine. Lesions of the tuberculum olfactorium were without effect on spontaneous or amphetamine induced responses. The results support the concept of a modulatory 5HT influence on nigro-striatal function, and suggest that 5HT in the nucleus accumbens has an antagonistic role with respect to dopamine function in this site.

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Authors and Affiliations

  1. Department of Pharmacology, Medical School, University of Bristol, University Walk, BS8 1TD, Bristol, UK

    C. J. Carter & C. J. Pycock

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  1. C. J. Carter
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  2. C. J. Pycock
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Carter, C.J., Pycock, C.J. The effects of 5,7-dihydroxytryptamine lesions of extrapyramidal and mesolimbic sites on spontaneous motor behaviour, and amphetamine-induced stereotypy. Naunyn-Schmiedeberg's Arch. Pharmacol. 308, 51–54 (1979). https://doi.org/10.1007/BF00499718

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  • DOI: https://doi.org/10.1007/BF00499718

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