L-DOPA cyclohexyl ester is a novel potent and relatively stable competitive antagonist against L-DOPA among several L-DOPA ester compounds.
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| Abstract |
We explored L-DOPA esters with chemically bulky structures to find a potent stable competitive antagonist against L-DOPA, compared to DOPA methyl ester (DOPA ME). In anesthetized rats, DOPA cyclohexyl ester (DOPA CHE), DOPA cyclopentyl ester (DOPA CPE) and DOPA cyclopentyldimethyl ester (DOPA CPDME) at 1 microgram microinjected into depressor sites of the nucleus tractus solitarii elicited or tended to elicit more marked antagonism against depressor responses to 60 ng L-DOPA, compared to DOPA ME. At 100 ng, DOPA CHE elicited the most potent antagonism. At 1 microgram, duration of the antagonistic activity of DOPA CHE was approximately three times longer than that of DOPA ME. During microdialysis of the nucleus accumbens, conversion from DOPA CHE at 1 microM perfused via probes to extracellular L-DOPA was the lowest among these compounds and less than one half of that from DOPA ME. Binding studies showed that the recognition site for L-DOPA differs from ionotropic glutamatergic, dopaminergic D1 and D2 receptors. We recently found that L-DOPA evoked by transient ischemia may act as a DOPA CHE-sensitive causal factor for glutamate release and resultant neuronal cell death. DOPA CHE is the most potent, relatively stable competitive antagonist against L-DOPA and is a useful mother compound to develop neuroprotective drugs.
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| Authors | N Furukawa, Y Goshima, T Miyamae, Y Sugiyama, M Shimizu, E Ohshima, F Suzuki, N Arai, K Fujita, Y Misu |
| Journal | Japanese journal of pharmacology (Jpn J Pharmacol) Vol. 82 Issue 1 Pg. 40-7 (Jan 2000) ISSN: 0021-5198 [Print] Japan |
| PMID | 10874587 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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