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. 1992 Apr;105(4):869–874. doi: 10.1111/j.1476-5381.1992.tb09070.x

Effect of alpha-human atrial natriuretic peptide on the synthesis of dopamine in the rat kidney.

P Soares-da-Silva 1, M H Fernandes 1
PMCID: PMC1908710  PMID: 1324052

Abstract

1. The present study has examined the influence of alpha-human atrial natriuretic peptide (alpha-hANP) on the synthesis of dopamine and its deamination into 3,4-dihydroxyphenylacetic acid (DOPAC) in rat kidney slices loaded with exogenous L-dihydroxyphenylalanine (L-DOPA). 2. alpha-hANP (3.3 and 330 nM) was found to produce a marked reduction (63-78% reduction) in the time-dependent accumulation of newly-formed dopamine and of its deaminated metabolite DOPAC in kidney slices loaded with 10 microM L-DOPA. alpha-hANP (330 nM) was also found to decrease the accumulation of newly-formed dopamine (45-66% reduction) and DOPAC (38-61% reduction) in experiments in which increasing concentrations (1-100 microM) of L-DOPA were used. This inhibitory effect was found to be potentiated by zaprinast (M&B 22,948; 10 microM), a guanosine cyclic 3',5'-monophosphate (cyclic GMP) phosphodiesterase inhibitor. Alone, zaprinast also decreased the accumulation of both dopamine (54-71% reduction) and DOPAC (73-92% reduction). 3. In kidney homogenates, alpha-hANP (330 nM) was found to affect neither the formation of dopamine nor its deamination to DOPAC. 4. Both alpha-hANP (330 nM) and zaprinast (10 microM) were found not to affect the formation of dopamine and DOPAC in kidney slices obtained from rats on a high salt diet during the previous 6 weeks. A similar situation was also found to occur when kidney slices obtained from 24-months old rats were used.(ABSTRACT TRUNCATED AT 250 WORDS)

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