PMID: 9181087Aug 1, 1996Paper

Transient expression of an atypical D1-like dopamine receptor system during avian retina differentiation

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas
M C De MelloF G De Mello

Abstract

Intact cultured retina cells from chick embryos at stage E9C5 (cultures initiated with retinae from 9-day old embryos followed by 5 days in culture), preincubated with 2 nM unlabelled SCH 23390 (R(+)-7- chloro-8-hydroxy-3-methyl-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine hydrochloride) for 20 to 60 min at 37 degrees C and then washed 5 to 25 times (approximately 1.5 min/wash) with 2 ml SCH 23390-free medium, responded to dopamine with cAMP accumulation that corresponded to 30-50% of the dopamine-promoted cAMP accumulation observed in untreated cells or in cells exposed to the inactive isomer of SCH 23390. Therefore, 50 to 70% of the dopamine response of SCH 23390-pretreated cells was inhibited after extensive washings of the cultures. At E9C12 the fraction of the dopamine response that remained inhibited by SCH 23390 after the washings declined to 30% of the control cultures or the cultures exposed to the SCH 23390 enantiomer. Cultures at stage E9C5 treated with SCH 23390 followed by extensive washings as above and then used for measuring the number of [3H]-SCH 23390 specific binding sites revealed that 60% of the sites did not interact with the tritiated compound when compared to untreated cultures or to cultures preincubate...Continue Reading

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