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- W2034282426 abstract "N-ethoxycarbonyl−2-ethoxy−1,2-dihydroquinoline (EEDQ), an irreversible alpha adrenergic antagonist, also acts as a potent and longlasting in vivo antagonist of D-2 dopamine receptors. Rats given EEDQ 3−10 mg/kg i.p. exhibit catalepsy and greatly reduced apomorphine-induced stereotypy, behavioral effects associated with D-2 dopamine receptor blockade. These effects are apparent up to 4 days after drug administration, with scores returning to control level by day 7. In vitro receptor binding assays of striatal membrane preparations from these animals using the radioligand 3H-spiroperidol directly demonstrate that EEDQ is a potent D−2 dopamine receptor antagonist, revealing the apparent basis of the behavioral effects of EEDQ. This antagonism proceeds via a reduction in D-2 receptor Bmax, with no change in the observed KD for 3H-spiroperidol, and is resistant to extensive washing of the membrane preparation after in vivo EEDQ exposure. These observations suggest that EEDQ inhibition of D-2 receptors is irreversible. Administration of behaviorally active doses of EEDQ effect a reduction of 50−85% in D-2 receptor number. Recovery of this loss roughly parallels recovery of normal catalepsy and apomorphine stereotypy scores. These doses of EEDQ also reduce binding of 3H-flupentixol to D-1 and 3H-dopamine to D-3 type dopaminergic binding sites, putative dopamine receptors with no known behavioral correlates. Recovery of D-1 and D-3 binding also occurs with a similar timecourse. Because of the apparent covalent nature of its interaction with dopamine receptors and because of its activity after peripheral administration, EEDQ may prove useful in the study of the function and turnover of dopamine receptors." @default.
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- W2034282426 date "1983-05-01" @default.
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- W2034282426 title "Behavioral and radioligand binding evidence for irreversible dopamine receptor blockade by N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline" @default.
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- W2034282426 doi "https://doi.org/10.1016/0024-3205(83)90423-x" @default.
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