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Journal of Histochemistry and Cytochemistry, Vol. 45, 1643-1650, Copyright © 1997 by The Histochemical Society, Inc.

ARTICLE

Immunocytochemical Localization of the NPY/PYY Y1 Receptor in Enteric Neurons, Endothelial Cells, and Endocrine-like Cells of the Rat Intestinal Tract

Malene Jackerotta and Lars-Inge Larssona
a Department of Molecular Cell Biology, Statens Seruminstitut, Copenhagen, Denmark

Correspondence to: Lars-Inge Larsson, Dept. of Molecular Cell Biology, Statens Seruminstitut, Artillerivej 5, Bldg. 81, DK-2300 Copenhagen S, Denmark.

Neuropeptide Y (NPY) and peptide YY (PYY) are structurally related peptides that are considered to mediate inhibitory actions on gastrointestinal motility, secretion, and blood flow. Several receptor subtypes for these peptides have been identified and the Y1, Y2, Y4/PP1, Y5, and Y5/PP2/Y2b receptors have been cloned. In this article we report the immunocytochemical localization of the Y1 receptor to myenteric and submucosal nerve cell bodies, endothelial cells, and scattered endocrine-like cells of rat intestinal tract. Moreover, double immunofluorescence demonstrates that subpopulations of the Y1 receptor-positive nerve cell bodies are immunopositive for NPY, vasoactive intestinal polypeptide, and nitric oxide synthase. In part, such co-localizations were made possible by use of peroxidase-mediated deposition of tyramide, which permitted use of antisera derived from the same species. Our observations suggest the existence of multiple neuronal, endothelial, and endocrine target sites for NPY and PYY and that some of the actions of these regulatory peptides can be mediated by vasoactive intestinal peptide and nitric oxide synthase. (J Histochem Cytochem 45:1643-1650, 1997)

Key Words: neuropeptide Y, peptide YY, Y1 receptor, intestine, rat, immunocytochemistry


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