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The binding of [3H]indalpine (4-[2-(3-indolyl)]ethyl piperidine) to slide-mounted sections of rat brain has been characterized. This 5-hydroxytryptamine (5-HT) uptake blocker binds to sections with high affinity (KD approximately 1 nM). The binding is saturable, and can be displaced by the addition of clomipramine (1 microM). Other drugs inhibiting the uptake of 5-HT also have the capacity to inhibit the binding of [3H]indalpine. A significant correlation (r = 0.86) was found between the capacity of these compounds to inhibit the uptake of 5-HT and their potencies as inhibitors of [3H]indalpine binding. Binding was Na+ - and Cl- -dependent and was inhibited competitively by 5-HT. Furthermore, electrolytic lesions of the dorsal raphe or medial forebrain bundle, which cause a degeneration of 5-HT cell bodies and fibers, respectively, resulted in a 30-40% reduction in the binding of [3H]indalpine. [3H]Indalpine binds to the 5-HT uptake recognition sites in a different manner from imipramine-like compounds.
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The Journal of neuroscience : the official journal of the Society for Neuroscience,
