Vet Med - Czech, 2009, 54(12):589-597 | DOI: 10.17221/66/2009-VETMED

Expression of vasoactive intestinal polypeptide, substance P and neuropeptide Y in jejunal enteric nerves is altered in rabbits suffering from long term Trichinella spiralis infection: an immunohistochemical study

M.B. Arciszewski1, Z. Nowakowski1, K. Wasowicz2, J. Calka2
1 Faculty of Veterinary Medicine, University of Life Sciences, Lublin, Poland
2 Faculty of Veterinary Medicine, Warmia and Mazury University, Olsztyn, Poland

In the early intestinal stage of infection with the nematode Trichinella spiralis alterations in gut motility and chemical code of enteric neurons are observed. The present study was designed to characterize the changes in expression pattern of vasoactive intestinal polypeptide (VIP), substance P (SP) and neuropeptide Y (NPY) in enteric nerves of the rabbit jejunum occurring during long-lasting trichinellosis (35 and 42 days). Sections of the jejunum from healthy and T. spiralis-infected rabbits were processed for double immunocytochemistry in which antibodies against protein gene product 9.5 were used as a pan-neuronal marker and mixed with antisera raised against VIP, SP or NPY. At 35 and 42 days post infection a marked decrease of VIP-, SP- and NPY-immunoreactive (IR) jejunal myenteric neurons was found, whereas the expression of these neuropeptides in submucous neurons was unchanged. In the myenteric plexus and the jejunal circular muscle of T. spiralis-infected rabbits a significant reduction of VIP-IR (but not SP-IR) nerve fibres was noted. In the longitudinal muscle of the jejunum from animals with long-lasting trichinellosis the density of SP-IR nerve terminals was decreased, whereas the number of VIP-containing nerve fibres was unchanged. Long-lasting trichinellosis had no influence on NPY-IR nerve fibres in both circular and longitudinal smooth muscles. The number of NPY-positive (but not VIP- and SP-IR) nerve fibres supplying mucosa and blood vessels was decreased in T. spiralis-infected animals. These data indicate that during long-lasting trichinellosis expression of neuropeptides in jejunal enteric neurons is changed. A possible involvement of VIP and SP in persistent intestinal dysmotility and NPY in altered fluid secretion is discussed.

Keywords: neuropeptides; enteric nervous system; neuronal plasticity; trichinellosis; rabbit

Published: December 31, 2009  Show citation

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Arciszewski MB, Nowakowski Z, Wasowicz K, Calka J. Expression of vasoactive intestinal polypeptide, substance P and neuropeptide Y in jejunal enteric nerves is altered in rabbits suffering from long term Trichinella spiralis infection: an immunohistochemical study. Vet Med - Czech. 2009;54(12):589-597. doi: 10.17221/66/2009-VETMED.
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