Conjugated dopamine in superfusates of slices of rat striatum.

Abstract:

:An acid-hydrolyzable conjugate of 3,4-dihydroxyphenylethylamine (dopamine, DA) was detected in superfusates from slices from rat striatum. The concentrations of endogenous free and conjugated DA, and of the acid metabolites (3,4-dihydroxyphenylacetic acid [DOPAC] and homovanillic acid [HVA]) in superfusates were measured using HPLC with electrochemical detection. Conjugated DA in superfusates represented 10-20% of the free DA under basal conditions and during release evoked by p-tyramine (5 X 10(-6) M to 5 X 10(-4) M); much smaller amounts of conjugated DA overflowed into superfusate when DA was released by equimolar concentrations of beta-phenylethylamine. Surprisingly, inhibition of monoamine oxidase by the inhibitors N-methyl-N-propargyl-3-(2,4-dichlorophenoxy)propylamine hydrochloride (clorgyline) or N-methyl-N-2-propynylbenylamine (pargyline) had little effect on the amounts of conjugated DA present in superfusate. Under basal conditions, the amounts of conjugated DA in superfusate were always less than the amounts of DOPAC but quite similar to the amounts of HVA. However, during release of DA evoked by p-tyramine the concentrations of conjugated DA in superfusate showed much more pronounced increases than those of the acidic metabolites.

journal_name

J Neurochem

authors

Tyce GM,Rorie DK

doi

10.1111/j.1471-4159.1982.tb12575.x

subject

Has Abstract

pub_date

1982-11-01 00:00:00

pages

1333-9

issue

5

eissn

0022-3042

issn

1471-4159

journal_volume

39

pub_type

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