Neurokinin-3 receptor expression within rat midbrain dopamine neurons was demonstrated using a combination of in situ hybridization and receptor autoradiographic techniques. Continuous intranigral infusion of the neurokinin-3 receptor agonist senktide selectively increased striatal dopamine metabolism over a period of several days, followed by the apparent development of tolerance. In contrast, in animals with moderate unilateral 6-hydroxydopamine-induced lesions of nigrostriatal dopamine cells, intranigral senktide infusion increased dopamine turnover in the surviving dopamine neurons and reduced functional dopamine asymmetry (reflected by spontaneous rotations) over the 2-week period tested. Thus nigral neurokinin receptors can modulate normal dopamine cell activity and may provide a therapeutic target in the treatment of Parkinson's disease.
Brain Research – Elsevier
Published: Oct 9, 1995
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