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Dopamine Receptor Stimulation Does Not Affect Phosphoinositide Hydrolysis in Slices of Rat Striatum
Author(s) -
Kelly Eamonn,
Batty Ian,
Nahorski Stefan R.
Publication year - 1988
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1988.tb01828.x
Subject(s) - striatum , dopamine , stimulation , neuroscience , dopamine receptor , chemistry , affect (linguistics) , pharmacology , biology , psychology , communication
Abstract: The effect of dopamine receptor stimulation on the accumulation of labelled inositol phosphates in rat striatal slices under basal and stimulated conditions was examined following preincubation with [ 3 H]inositol. Incubation of striatal slices with the selective D‐1 agonist SKF 38393 or the selective D‐2 agonist LY 171555 for 5 or 30 min did not affect the basal accumulation of labelled inositol mono‐, bis‐, tris‐, and tetrakisphosphate. Resolution by HPLC of inositol trisphosphate into inositol‐1,3,4‐tris‐phosphate and inositol‐1,4,5‐trisphosphate isomers revealed that under basal conditions dopamine did not influence the accumulation of inositol‐1,4,5‐trisphosphate. Depolarisation evoked by KC1, or addition of the muscarinic receptor agonist carbachol, produced a marked increase in the accumulation of labelled inositol phosphates in both the presence and absence of lithium. Addition of dopamine did not reduce the ability of KC1 or carbachol to increase inositol phospholipid hydrolysis. In the presence of lithium, dopamine (100 μ M ) enhanced KCl‐stimuIated inositol phospholipid hydrolysis, but this effect appears to be mediated by α 1 adrenoceptors because it was blocked by prazosin. SKF 38393 (10 μ M ) or LY 171555 (10 μ M ) also did not affect carbachol‐stimulated inositol phospholipid hydrolysis. These data, in contrast to recent reports, suggest that striatal dopamine receptors do not appear to be linked to inositol phospholipid hydrolysis.