RGD Reference Report - Dynorphin-immunoreactive terminals in the rat nucleus accumbens: cellular sites for modulation of target neurons and interactions with catecholamine afferents. - Rat Genome Database

RGD Reference Report - Dynorphin-immunoreactive terminals in the rat nucleus accumbens: cellular sites for modulation of target neurons and interactions with catecholamine afferents. - Rat Genome Database

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Dynorphin-immunoreactive terminals in the rat nucleus accumbens: cellular sites for modulation of target neurons and interactions with catecholamine afferents.
Authors:	Van Bockstaele, E J Sesack, S R Pickel, V M
Citation:	Van Bockstaele EJ, etal., J Comp Neurol. 1994 Mar 1;341(1):1-15. doi: 10.1002/cne.903410102.
RGD ID:	13702229
Pubmed:	PMID:7911809 (View Abstract at PubMed)
DOI:	DOI:10.1002/cne.903410102 (Journal Full-text)
Dynorphin facilitates conditioned place aversion and reduces locomotor activity through mechanisms potentially involving direct activation of target neurons or release of catecholamines from afferents in the nucleus accumbens. We examined the ultrastructural substrates underlying these actions by combining immunoperoxidase labeling for dynorphin 1-8 and immunogold silver labeling for the catecholamine synthesizing enzyme, tyrosine hydroxylase (TH). The two markers were simultaneously visualized in single coronal sections through the rat nucleus accumbens. By light microscopy, dynorphin immunoreactivity was seen as patches of immunoreactive varicosities throughout all rostrocaudal levels of the nucleus accumbens. The dynorphin-immunoreactive terminals identified by electron microscopy ranged from 0.2 to 1.5 microns in cross-sectional diameter, contained numerous small (30-40 nm) clear vesicles, as well as one or more large (80-100 nm) dense core vesicles. From the dynorphin-immunoreactive terminals quantitatively examined in single sections, 74% (173/370) showed symmetric synaptic junctions mainly with large unlabeled dendrites. Of the dynorphin-immunoreactive terminals forming identifiable synapses, approximately 30% contacted more than one dendritic target. In addition, single dendrites frequently received convergent input from more than one dynorphin-labeled terminal. Irrespective of their dendritic associations, dynorphin-immunoreactive terminals also frequently showed close appositions with other axons and terminals; these included unlabeled (41%), TH-labeled (10%) or dynorphin-labeled axons (14%). In contrast to dynorphin-immunoreactive terminals, TH-labeled terminals formed primarily symmetric synapses with small dendrites and spines or lacked recognizable specializations in the plane of section analyzed. In some cases, single dendrites were postsynaptic to both dynorphin and TH-immunoreactive terminals. We conclude that dynorphin-immunoreactive terminals potently modulate, and most likely inhibit, target neurons in both subregions of the rat nucleus accumbens. This modulatory action could attenuate or potentiate incoming catecholamine signals on more distal dendrites of the accumbens neurons. The findings also suggest potential sites for presynaptic modulatory interactions involving dynorphin and catecholamine or other transmitters in apposed terminals.

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Object Symbol	Species	Term	Qualifier	Evidence	With	Notes	Source	Original Reference(s)
Pdyn	Rat	neuronal dense core vesicle lumen	is_active_in	IDA		PMID:7911809	SynGO
Pdyn	Rat	synaptic vesicle	is_active_in	IDA		PMID:7911809	SynGO

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Genes (Rattus norvegicus)

Pdyn (prodynorphin)

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