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Aromatic L-amino acid decarboxylase (AAAD) activity is enhanced in the striatum of control and MPTP-treated mice after administration of a single dose of the dopamine receptor antagonists haloperidol, sulpiride, and SCH 23390. MPTP-treated mice appear more sensitive to the antagonists, i.e., respond earlier and to lower doses of antagonists than control(More)
The catecholamine neurotransmitters, dopamine (DA), norepinephrine (NE) and epinephrine (EPI), are found in the retina in separate structures (Haggendal and Malmfors,1965; Hadjiconstantinou et al., 1984; Dowling et al., 1976). DA is associated with a subpopulation of amacrine cells and with interplexiform cells (Dowling et al., 1976). It is the most(More)
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