Abstract:We investigated the number of tyrosine hydroxylase (TH)-positive neurons in the rat substantia nigra (SN) after unilateral lesion of SN dopamine neurons with intranigral 6-hydroxydopamine (6-OHDA) injection. Non-radioactive in situ hybridization procedure and immunohistochemistry detected much less (<5%) TH-positive neurons in the lesioned SN, compared with the contralateral side. Single administration of a dopamine antagonist haloperidol failed to increase TH labeling on the lesioned side, although it increas… Show more
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