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SDZ GLC 756, a novel octahydrobenzo[g]quinoline derivative exerts opposing effects on dopamine D1 and D2 receptors

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Summary

SDZ GLC-756, a novel octahydrobenzo[g]quinoline derivative, is equipotent in displacing [3H]SCH23390 from dopamine D1 receptors and [3H]205–501 from dopamine D2 receptor binding sites. It blocks dopamine sensitive adenylate cyclase with the same potency as SCH23390, indicating antagonist properties at dopamine D1 receptors. On the other hand, SDZ GLC 756 inhibits electrically evoked acetylcholine release from rat striatal slices with the same potency as the selective dopamine D2 receptor agonist bromocriptine. This effect is blocked by spiperone suggesting that it is mediated by dopamine D2 receptor activation. The opposing action of SDZ GLC 756 on dopamine D1 and D2 receptors is also evident in vivo. SDZ GLC 756, like SCH23390, blocks apomorphine-induced rearing in mice. On the other hand, it inhibits prolactin secretion and produces circling in unilateral 6-OHDA-lesioned rats, which is compatible with stimulant properties at dopamine D2 receptors. This drug might be a new tool to study linkage between dopamine D1 and D2 receptors.

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Markstein, R., Gull, P., Rüdeberg, C. et al. SDZ GLC 756, a novel octahydrobenzo[g]quinoline derivative exerts opposing effects on dopamine D1 and D2 receptors. J. Neural Transmission 103, 17–30 (1996). https://doi.org/10.1007/BF01292613

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  • DOI: https://doi.org/10.1007/BF01292613

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