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Anatomical evidence for multiple pathways leading from the rostral ventrolateral medulla (nucleus paragigantocellularis) to the locus coeruleus in rat
Journal article   Peer reviewed

Anatomical evidence for multiple pathways leading from the rostral ventrolateral medulla (nucleus paragigantocellularis) to the locus coeruleus in rat

Bernadette Astier, Elisabeth J. Van Bockstaele, Gary Aston-Jones and Vincent A. Pieribone
Neuroscience letters, v 118(2), pp 141-146
16 Oct 1990
PMID: 2274260

Abstract

Adrenergic Afferent pathway C1 group Electrolytic lesion Fluoro-Gold Medullary bundle Phenylethanolamine- N-methyl-transferase Retrograde transport
Using retrograde transport of Fluoro-Gold (FG) combined with immuncfluorescence for phenylethanolamine- N-methyltransferase (PNMT), we have examined afferents to the nucleus locus coeruleus (LC) from the rostral ventrolateral medulla (nucleus paragigantocellularis; PGi) in rats sustaining lesions of the medullary adrenergic bundle (MB). In lesioned rats, very few adrenergic LC-projecting neurons persist in the PGi ipsilateral to the lesion, representing a 90% decrease in comparison to non-lesioned animals. These results indicate that almost all adrenergic input to the LC from C1 neurons in PGi is conveyed by the MB. In contrast, the number of non-adrenergic LC afferent neurons in the PGi ipsilateral to the lesion only decreased by 48% after such lesions. Thus, this pathway also provides non-adrenergic projections to LC from PGi, but many of these are conveyed by other route(s) as well.

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