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[A role of AGRP on dopamine brain neurons regulation].

In rats and mice in different dopaminergic brain structures the immunoreactive axons with agouti-related protein (AGRP) were identified. The double immunofluorescence method shows the presence of AGRP-immunoreactive processes around the bodies of dopaminergic neurons. In experiments in vitro after incubation of brain tissue from ventral tegmental area or hypothalamus with AGRP (83-132) the significant decrease of tyrosine hydroxylase optical density was indicated. The data indicate possible direct inhibitory action of AGRP on tyrosine hydroxylase level in dopaminergic brain neurons and its role as a modulator of the functional activity of dopaminergic neurons.