Abstract:
:Dynorphin (1-100 nM) dose dependently inhibited both spontaneous and electrically evoked endogenous dopamine (DA) release from slices of the nucleus accumbens of untreated rats. When this inhibitory effect was compared, it was significantly reduced in rats pretreated (for 9 days) with methamphetamine (6 mg/kg per day i.p.) relative to rats treated with saline. These findings indicate that dynorphin inhibits DA release from the nucleus accumbens, and that treatment with methamphetamine reduces the modulatory action of dynorphin on DA release. It is possible that repeated administration of methamphetamine leads to attenuation of the inhibition of DA release from the nucleus accumbens via presynaptic dynorphin-sensitive receptors.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Yokoo H,Yamada S,Yoshida M,Tanaka M,Nishi Sdoi
10.1016/0014-2999(92)90461-ckeywords:
subject
Has Abstractpub_date
1992-11-03 00:00:00pages
43-7issue
1eissn
0014-2999issn
1879-0712pii
0014-2999(92)90461-Cjournal_volume
222pub_type
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