Abstract
1. Our method of real-time monitoring of dopamine release from rat striatal slices revealed that endothelin (ET)-3-induced dopamine release was inhibited by N G-methyl-L-arginine (L-NMMA; 1 mM), an inhibitor of nitric oxide (NO) synthase, while N G-methyl-D-arginine (D-NMMA; 1 mM), an inactive isomer of L-NMMA, had no effect.
2. The inhibition of L-NMMA (0.1 mM) became apparent when tissues were pretreated with tetrodotoxin (1 μM) for 30 min and subsequently exposed to ET-3 (4 μM).
3. L-NMMA (0.1 and 1 mM) dose dependently protected against ET-3-triggered hypoxic/hypoglycemic impairment of striatal responses to high K+.
4. Thus, NO may work as a promoter in mediation of the stimulatory and neurotoxic action of ET-3 on the striatal dopaminergic system, presumably by interacting with interneurons in the striatum.
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Shibaguchi, H., Kataoka, Y., Koizumi, S. et al. Nitric Oxide Participates in the Stimulatory and Neurotoxic Action of Endothelin on Rat Striatal Dopaminergic Neurons. Cell Mol Neurobiol 17, 471–481 (1997). https://doi.org/10.1023/A:1026354720732
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DOI: https://doi.org/10.1023/A:1026354720732