Abstract

By using double immunolabeling light and electron microscopic techniques, dense neuronal network of calcitonin gene-related peptide (CGRP) has been visualized in the nucleus of the solitary tract with complete overlapping of the tyrosine hydroxylase (TH)-containing cells. TH-immunoreactive perikarya and dendrites were seen in synaptic contact with CGRP-immunopositive fibers, indicating that CGRP, by carrying sensory signals may influence autonomic regulatory mechanisms in the NTS through local catecholaminergic neurons.

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