Presence and distribution of serotonin in the stomach of the

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TitlePresence and distribution of serotonin in the stomach of the Antarctic silverfish Pleuragramma antarcticumAbstractSerotonin is a signal molecule with a wide range of functions in vertebrates. In Antarctic fishes, the serotonergic system has been studied in the brain, revealing differences from temperate fishes related to the long-term cold adaptation. To date, little is known regarding the peripheral nervous system, and no information is available for the stomach. In the present work, we contribute to fill the gaps by investigating the presence and the immunohistochemical distribution of serotonin in the stomach of the Antarctic silverfish Pleuragramma antarcticum, a cold-adapted key species of the Southern Ocean shelf food web. The main aim was to investigate the serotonergic system at the gastric level, in order to reveal possible peculiarities related to long-term cold adaptation, similar to the ones seen in the central nervous system of Antarctic fishes. Serotonin immunoreactivity was detected in the pyloric and cardiac mucosa of P. antarcticum stomach with immunopositive cells in the pyloric and cardiac surface epithelia and in the tubular glands. No immunopositive fibers and neuronal cell bodies were found. Our results highlight that the serotonin distribution pattern at the gastric level is similar to that described in temperate teleosts. This finding suggests that in P. antarcticum, long-term adaptations to the Antarctic condition do not affect the serotonergic system at the gastric level. In addition, our data constitute the baseline information for further investigations aimed at clarifying the effects of short-term temperature variations on the gastric serotonergic system of Antarctic species in the frame of the global climate change. ©2011 Springer-Verlag.AcknowledgementsThe participation of LG to the RV Tangaroa BioRoss Expedition 2004 was supported by the Italian National Program for Antarctic Research (PNRA). We are grateful to the Captain and the crew of the RV Tangaroa for assistance during sampling activities. The study contributes to the SCAR Research Program "Evolution and Biodiversity in Antarctica (EBA)".

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1st AuthorGambardella, C.AuthorGambardella, C.Ghigliotti, L.Gallus, L.Pisano, E.Tagliafierro, G.Ferrando, S.Year2012JournalPolar BiologyVolume35Number5Pages795-799DOI10.1007/s00300-011-1129-4URLhttps://www.scopus.com/inward/recor.....dddcf4743ab69dc9f292907d9Keywordsadaptationbrainclimate changecold tolerancefood webglobal changeimmunoassaynervous systemperciformstomach content, Southern Ocean, PiscesPleuragramma antarcticumTeleosteiVertebrata, rank1Author KeywordsAntarctic fishImmunohistochemistryPleuragramma antarcticumSerotoninStomach

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TypeArticleCitationGambardella, C., Ghigliotti, L., Gallus, L., Pisano, E., Tagliafierro, G. and Ferrando, S. (2012). Presence and distribution of serotonin in the stomach of the Antarctic silverfish Pleuragramma antarcticum. Polar Biology, 35(5): 795-799IdentifierGambardella2012Relevancerank1

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