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An immunohistochemical study of the gut neuroendocrine system in juvenile pejerrey Odontesthes bonariensis (Valenciennes)

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In this study, several neuropeptides were identified by immunohistochemistry in neuroendocrine cells (NEC) located in the gut epithelium and nerve cell bodies of the enteric nervous system of pejerrey Odontesthes bonariensis, a species that is a promising candidate for intensive aquaculture. The neuropeptides involved in orexigenic or anorexigenic action, i.e. gastrin, cholecystokinin-8, neuropeptide Y and calcitonin gene-related peptide (CGRP), displayed a significantly higher number of immunoreactive NECs in the anterior intestine, suggesting that this region of the gut plays an important role in the peripheral control of food intake. On the other hand, leu-enkephalin and vasoactive intestinal peptide (VIP), both associated with the modulation of the enteric immune system, showed no significant variations in the mean value of immunopositive NECs between the anterior and posterior intestine. This may indicate that their activity is required at a similar level along the entire gut. In addition, CGRP and VIP-immunoreactive neurons and nerve fibres were observed in the myenteric plexus, which might exert synergistic effects with the neuropeptides immunolocalized in NECs.

Keywords: immunohistochemistry; intestine; myenteric nerve fibres; myenteric neurons; neuroendocrine cells; neuropeptides

Document Type: Regular Paper


Affiliations: 1: Cátedra de Histología y Embriología, Facultad de Ciencias Veterinarias, Universidad Nacional de Rosario, Bv. Ovidio Lagos y Ruta 33, S2170HGJ, Casilda, Argentina 2: Instituto de Ictiología del Nordeste, Facultad de Ciencias Veterinarias, Universidad Nacional del Nordeste, Sargento Cabral 2139, 3400 Corrientes, Argentina 3: Departamento Anatomía y Producción Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain 4: Departamento de Ciencias Clínicas Veterinarias, Facultad de Veterinaria, Universidad de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain

Publication date: 2011-03-01

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