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Adaptation to different salinities exposes functional specialization in the int...
Gregório, SÃlvia F.; Carvalho, Edison Samir Mascarelhas; Encarnação, Sandra; Wilson, J.; Power, Deborah; Canario, Adelino V. M.; Fuentes, J.The processing of intestinal fluid, in addition to a high drinking rate, is essential for osmoregulation in marine fish. This study analyzed the long-term response of the sea bream (Sparus aurata L.) to relevant changes of external salinity (12, 35 and 55ï€ p.p.t.), focusing on the anterior intestine and in the less-often studied rectum. Intestinal water absorption, epithelial HCO3– secretion and gene express...
Prolactin regulates luminal bicarbonate secretion in the intestine of the sea b...
Ferlazzo, A.; Carvalho, E. S. M.; Gregorio, S. F.; Power, Deborah; Canario, Adelino V. M.; Tischitta, F.; Fuentes, J.The pituitary hormone prolactin is a pleiotropic endocrine factor that plays a major role in the regulation of ion balance in fish, with demonstrated actions mainly in the gills and kidney. The role of prolactin in intestinal ion transport remains little studied. In marine fish, which have high drinking rates, epithelial bicarbonate secretion in the intestine produces luminal carbonate aggregates believed to pl...
A PTH/PTHrP receptor antagonist blocks the hypercalcemic response to estradiol-17b
Fuentes, J.; Guerreiro, P. M.; Modesto, Teresa; Rotllant, J.; Canario, Adelino V. M.; Power, DeborahEstradiol (E2) increases circulating calcium and phosphate levels in fish, thus acting as a hypercalcemic and hyperphosphatemic factor during periods of high calcium requirements, such as during vitellogenesis. Since parathyroid hormone (PTH)-related protein (PTHrP) has been shown to be calciotropic in fish, we hypothesized that the two hormones could be mediating the same process. Sea bream (Sparus auratus) ju...
Isolation of a novel aquaglyceroporin from a marine teleost (Sparus auratus) Fu...
Santos, C. R. A.; Estêvão, M. D.; Fuentes, J.; Cardoso, J. C. R.; Fabra, M.; Passos, A. L.; Detmers, F. J.; Deen, P. M. T.; Cerdà, J.; Power, DeborahThe aquaporins (formerly called the major intrinsic protein family) are transmembrane channel proteins. The family includes the CHIP group, which are functionally characterised as water channels and the GLP group, which are specialised for glycerol transport. The present study reports the identification and characterisation of a novel GLP family member in a teleost fish, the sea bream Sparus auratus. A sea brea...
Effects of salinity challenge on the endocrine control of osmoregulation and ca...
Guerreiro, P. M.; Fuentes, J.; Flik, G.; Canario, Adelino V. M.; Power, DeborahThe gilthead sea bream (Sparus auratu) is a marine species often found in coastal lagoons, experimenting episodic exposures to both brackish and hypersaline environments. However, little is known about the underlying endocrine mechanisms controlling osmoregulation in this and in most marine species. This study aimed at characterising some of the endocrine basis of sea bream osmoregulation, with emphasis on calc...
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