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Extrinsic Primary Afferent Neurons Projecting to the Pylorus in the Domestic Pig—Localization and Neurochemical Characteristics

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Abstract

The pig, as an omnivorous animal, seems to be especially valuable species in “gastrointestinal” experiments. The importance of the pylorus in the proper functioning of the digestive tract is widely accepted. Although it is commonly known that sensory innervation plays an important role in the regulation of gastric activity and gastrointestinal tissue resistance, there is complete lack of data on the extrinsic afferents projecting to the swine pylorus. The present experiment has been designed to discover the precise localization and neurochemical properties of the primary sensory neurons projecting to the porcine pylorus. Combined retrograde tracing technique and double immunocytochemistry were applied in five piglets. An additional RT-PCR reaction was used to confirm the presence of all investigated neurotransmitters in the studied ganglia. Traced neurons were localized within the bilateral nodose ganglia of the vagus and bilateral dorsal root ganglia spreading from Th4 to L1. Fast Blue-positive afferents expressed immunoreactivity to substance P, calcitonin gene-related peptide, neuronal isoform of nitric oxide synthase, and galanin. In the vagal and spinal ganglia, the percentages of traced neurons immunoreactive to these substances were 54.8, 10.7, 49.6, 7.4 % and 22.2, 75.5, 95.2 %, respectively, and the solitary perikarya were Gal immunoreactive. The presence of all substances studied in the ganglion tissue was confirmed by RT-PCR technique.

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  1. Department of Animal Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13, 10-719, Olsztyn, Poland

    Michal Zalecki

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  1. Michal Zalecki
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Correspondence to Michal Zalecki.

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Zalecki, M. Extrinsic Primary Afferent Neurons Projecting to the Pylorus in the Domestic Pig—Localization and Neurochemical Characteristics. J Mol Neurosci 52, 82–89 (2014). https://doi.org/10.1007/s12031-013-0116-3

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  • DOI: https://doi.org/10.1007/s12031-013-0116-3

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