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|Título:||Olfactory transduction pathways in the Senegalese sole Solea senegalensis|
Barata, E. N.
Canario, Adelino V. M.
|Citação:||Velez, Z.; Hubbard, P. C.; Barata, E. N.; Canário, A. V. M. Olfactory transduction pathways in the Senegalese sole Solea senegalensis , Journal of Fish Biology, 83, 3, 501-514, 2013.|
|Resumo:||This study tested whether differences in sensitivity between the upper and lower olfactory epithelia of Solea senegalensis are associated with different odorant receptors and transduction pathways, using the electro-olfactogram. Receptor mechanisms were assessed by cross-adaptation with amino acids (L-cysteine, L-phenylalanine and 1-methyl-L-tryptophan) and bile acids (taurocholic acid and cholic acid). This suggested that relatively specific receptors exist for 1-methyl-L-tryptophan and Lphenylalanine (food-related odorants) in the lower epithelium, and for taurocholic acid (conspecificderived odorant) in the upper. Inhibition by U73122 [a phospholipase C (PLC) inhibitor] suggested that olfactory responses to amino acids were mediated mostly, but not entirely, by PLC-mediated transduction (IC50; 15–55 nM), whereas bile acid responses were mediated by both PLC and adenylate cyclase–cyclic adenosine monophosphate (AC–cAMP) (using SQ-22536; an AC inhibitor). Simultaneous application of both drugs rarely inhibited responses completely, suggesting possible involvement of non-PLC and non-AC mediated mechanisms. For aromatic amino acids and bile acids, there were differences in the contribution of each transduction pathway (PLC, AC and non-PLC and non-AC) between the two epithelia. These results suggest that differences in sensitivity of the two epithelia are associated with differences in odorant receptors and transduction mechanisms.|
|Aparece nas colecções:||CCM2-Artigos (em revistas ou actas indexadas)|
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|Olfactory transduction pathways in the Senegalese sole Solea senegalensis.pdf||738,48 kB||Adobe PDF||Ver/Abrir Acesso Restrito. Solicitar cópia ao autor!|
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