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- W2076898764 abstract "The extraneuronal and intraneuronal metabolism of rat brain endogenous dopamine was stimulated by amphetamine (5 mg/kg) and pimozide (2 mg/kg), respectively. Additional metabolic effects of two inhibitors of catechol O-methyltransferase (entacapone and tolcapone (both 30 mg/kg)) and a putative central uptake2 inhibitor (CGP 28014 (30 mg/kg)) were assessed. Amphetamine increased striatal dopamine and 3-methoxytyramine and decreased 3,4-dihydroxyphenylacetic acid (DOPAC) levels. The latter two effects were reversed by tolcapone and CGP 28014, but not by entacapone. Tolcapone, CGP 28014 and even entacapone decreased striatal homovanillic acid (HVA) levels. Pimozide-induced striatal DOPAC levels were further increased by tolcapone and CGP 28014. Both substances also decreased striatal HVA levels. Striatal 3-methoxytyramine levels were significantly lowered only by tolcapone. Our results show that enhanced central dopamine metabolism is modified by the inhibition of catechol O-methyltransferase even in the absence of L-3,4-dihydroxyphenylalanine (L-DOPA). The results also suggest that the mechanism of action of CGP 28014 may be other than true inhibition of catechol O-methyltransferase." @default.
- W2076898764 created "2016-06-24" @default.
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- W2076898764 date "1993-08-01" @default.
- W2076898764 modified "2023-10-16" @default.
- W2076898764 title "Modulation of rat brain endogenous dopamine metabolism by new inhibitors of catechol O-methyltransferase" @default.
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- W2076898764 doi "https://doi.org/10.1016/0014-2999(93)90973-l" @default.
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