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• W2079379568 abstract "Catecholamines in the nucleus tractus solitarii (NTS) have been implicated in autonomic responses to circulating hormones that act on neurons in the area postrema, the most caudal circumventricular organ in brain. We combined immunoperoxidase labeling of the anterograde tracer, Phaseolus vulgaris leucoagglutinin (PHAL) with immunogold-silver labeling of tyrosine hydroxylase to determine whether this enzymatic marker for catecholamines was present in efferents from the area postrema or their targets in the rat NTS. At survival periods of 10-12 days after PHAL injections into the area postrema, light microscopy revealed numerous varicose processes containing peroxidase reaction product for PHAL in the dorsomedial, medial, and commissural NTS. Some of these labeled processes were located near neuronal perikarya and processes containing immunogold-silver intensified reaction product for tyrosine hydroxylase. Electron microscopy of the commissural and dorsomedial NTS established that the majority of the labeling for PHAL was in axon terminals, whereas immunogold labeling for tyrosine hydroxylase was mainly in soma and dendrites. Only 3 out of 579 PHAL-labeled terminals also contained detectable tyrosine hydroxylase immunoreactivity. Fifty-eight percent (335/579) of the PHAL-labeled terminals formed synapses with recognized symmetric junctions, whereas the remainder lacked synaptic specializations within the examined series of serial sections. Of those PHAL terminals forming recognized symmetric junctions, 22% were on tyrosine hydroxylase-immunoreactive dendrites, 74% on unlabeled dendrites and 4% on unlabeled axon terminals. From a total of 1,250 observed contacts on tyrosine hydroxylase labeled dendrites, 88 (7%) contained PHAL, 9 (< 1%) contained TH, and 1,180 (93%) lacked detectable immunoreactivity and formed primarily symmetric synapses. We conclude that a few catecholamine, but mainly noncatecholamine efferents from the area postrema provide a monosynaptic, and most likely inhibitory input to target neurons both with and without tyrosine hydroxylase immunoreactivity in the dorsomedial and commissural NTS. Synapses between the efferent terminals from the area postrema and tyrosine hydroxylase labeled and unlabeled dendrites as well as unlabeled axons in these specific subnuclei of the NTS suggest multiple sites for modulation of gastric and cardiovascular reflexes in response to circulating peptides." @default.
• W2079379568 created "2016-06-24" @default.
• W2079379568 creator A5026206474 @default.
• W2079379568 creator A5079818001 @default.
• W2079379568 date "1993-03-15" @default.
• W2079379568 modified "2023-09-23" @default.
• W2079379568 title "Localization of tyrosine hydroxylase in neuronal targets and efferents of the area postrema in the nucleus tractus solitarii of the rat" @default.
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• W2079379568 doi "https://doi.org/10.1002/cne.903290305" @default.
• W2079379568 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8096227" @default.
• W2079379568 hasPublicationYear "1993" @default.
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