Immunohistochemical characteristics of neurons in the ganglia of the greater splanchnic nerve of the pig
Abstract
Introduction. Greater splanchnic nerve (GSN) is by far the largest of the splanchnic nerves and connects the paravertebral and prevertebral ganglia to transmit the majority of nociceptive information from the viscera. Despite its importance, the immunohistochemical features of the porcine GSN neurons have not yet been examined. Therefore, the aim of the study was to investigate the neurochemistry of the porcine GSN neurons and to compare their neurochemical coding with those of the paravertebral and prevertebral ganglia.
Material and methods. Four gilts of Large White Polish breed were examined in this study. Antibodies to tyrosine hydroxylase (TH), dopamine b-hydroxylase (DBH), choline acetyltransferase (ChAT), neuropeptide Y (NPY), vasoactive intestinal polypeptide (VIP), somatostatin (SOM), galanin (GAL), methionine-enkephalin (MET), calcitonin gene-related peptide (CGRP), and substance P (SP) were used for immunohistochemical detection of classical neurotransmitters marker enzymes and neuropeptides in neuronal cell bodies of the GSN.
Results. Double-labeling immunofluorescence revealed that virtually all GSN neurons exhibited the presence of catecholamine-synthesizing enzymes (TH/DBH-positive) and subpopulations of neurons contained immunoreactivity to NPY, VIP, SOM, GAL and MET. However, CGRP and SP-immunoreactivity were not observed in neuronal somata.
Conclusions. Our data strongly suggest that the general immunohistochemical characterization of ganglion cells in the porcine greater splanchnic nerve is similar to that of the prevertebral ganglia (e.g. celiacomesenteric ganglion).
Keywords: greater splanchnic nerveneuronsneurotransmitterspigimmunohistochemistry
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