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- W1678675087 abstract "Dopaminergic control over striatal targets appears to be retained in rats sustaining lesions of the nigrostriatal dopamine (DA) system as long as 5-10% of that projection remains. Similarly, during postnatal development, dopaminergic control over striatal neurons matures well before the innervation of striatum by the nigrostriatal bundle is attained. These observations suggest that enhanced efficacy of dopaminergic transmission may compensate for hypoinnervation of striatum after lesions or during development. To examine this hypothesis, striatal slices were superfused with Krebs bicarbonate buffer and effluent was collected and analyzed for endogenous DA. Electrical field stimulation (2 Hz) continuously delivered to slices prepared from intact adult rats increased DA efflux to 3-5 times the prestimulation rate within 10 min. Efflux then fell to approximately twice the basal rate over the next 20 min. DA efflux was also examined using slices prepared from adult animals given 6-hydroxydopamine 2-3 weeks earlier, and from 7-10-d-old rat pups. In each group, striatal DA levels were 10-40% of adult control values. Nevertheless, stimulated DA efflux from these slices attained the same rate as that observed with intact, adult slices. Thus, fractional DA efflux from these slices was several times higher than the control rate by the end of the stimulation period. This increased DA efflux appeared to be a consequence of both increased release and decreased reuptake of DA, as the fractional DA efflux from control striatal slices could not be increased to the rate seen in hypoinnervated slices using nomifensine (10 microM), an inhibitor of DA efflux.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1678675087 date "1987-06-01" @default.
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- W1678675087 title "Increased dopamine efflux from striatal slices during development and after nigrostriatal bundle damage" @default.
- W1678675087 doi "https://doi.org/10.1523/jneurosci.07-06-01648.1987" @default.
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