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Do vasoactive intestinal peptide (VIP)-and nitric oxide synthase-immunoreactive terminals synapse exclusively with VIP cell bodies in the submucous plexus of the guinea-pig ileum?

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Abstract

In the submucous plexus of the guinea-pig ileum, previous light-microscopic studies have revealed that vasoactive intestinal peptide (VIP)-immunoreactive and nitric oxide synthase (NOS)-immunoreactive terminals are found predominantly in association with VIP-immunoreactive nerve cell bodies. In this study, double-label immunohistochemistry at the light-microscopic level demonstrated co-localization of NOS-immunoreactivity and VIP-immunoreactivity in axon terminals in submucous ganglia. About 90% of nerve fibres with NOS-immunoreactivity or VIP-immunoreactivity were immunoreactive for both antigens; only about 10% of labelled varicosities contained only NOS-immunoreactivity or VIP-immunoreactivity. The VIP/NOS varicosities were more often seen in the central parts of the ganglia, close to the VIP-immunoreactive cell bodies. Ultrastructural immunocytochemistry with antibodies to VIP was used to determine if NOS/VIP terminals synapse exclusively with VIP-immunoreactive nerve cell bodies. We examined the targets of VIP-immunoreactive boutons in two submucous ganglia from different animals. Serial ultrathin sections were taken through the ganglia after they had been processed for VIP immunocytochemistry. For each cell body, the number of VIP inputs (synapses and close contacts) was determined. The number of VIP-immunoreactive synapses received by the cell bodies of submucous neurons varied from 0–4 and the number of VIP-immunoreactive close contacts varied from 3–10. There was no significant difference between VIP-immunoreactive nerve cell bodies and non-VIP nerve cell bodies in the number of VIP-immunoreactive synapses and close contacts they received. Thus, the implication from light microscopy that NOS/VIP terminals end predominantly on VIP nerve cells was not vindicated by electron microscopy.

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Abbreviations

CCK :

Cholecystokinin

cGMP :

guanosine-3′, 5′-cyclic monophosphate

CGRP :

calcitonin gene-related peptide

ChAT :

choline acetyltransferase

DYN :

dynorphin

GAL :

galanin

GTP :

guanosine triphosphate

IR :

immunoreactive(ivity)

NO :

nitric oxide

NOS :

nitric oxide synthase

NMU :

neuromedin U

NPY :

neuropeptide Y

SOM :

somatostatin

SP :

substance P

VIP :

vasoactive intestinal peptide

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Authors and Affiliations

  1. Department of Anatomy and Cell Biology, University of Melbourne, 3052, Parkville, Victoria, Australia

    Z. S. Li, H. M. Young & J. B. Furness

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  1. Z. S. Li
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  2. H. M. Young
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  3. J. B. Furness
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Li, Z.S., Young, H.M. & Furness, J.B. Do vasoactive intestinal peptide (VIP)-and nitric oxide synthase-immunoreactive terminals synapse exclusively with VIP cell bodies in the submucous plexus of the guinea-pig ileum?. Cell Tissue Res. 281, 485–491 (1995). https://doi.org/10.1007/BF00417865

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  • DOI: https://doi.org/10.1007/BF00417865

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