Molecular characterization and analysis of a truncated serotonin receptor gene expressed in neural and reproductive tissues of abalone
Data(s) |
01/05/2009
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Resumo |
In molluscs, the neurotransmitter serotonin (5-HT) has been linked to a variety of biological roles including gamete maturation and spawning. The possible involvement of 5-HT in abalone gamete release was demonstrated by a dose-dependent increase in <i>Haliotis rubra </i>gonad contractile bioactivity following 5-HT stimulation. Physiological functions associated with 5-HT, are mediated through binding to 5-HT receptors. A cDNA encoding a putative 5-HT receptor consisting of 359 amino acids was isolated from the tropical abalone <i>H. asinina</i>, termed 5-HT<sub>1 ha</sub>. The 5-HT<sub>1 ha </sub>shares G-protein-coupled receptor motifs with metazoan 5-HT receptors, including predicted transmembrane domains, active sites for protein kinase action, and N-linked glycosylation sites. However, the third intracellular loop of 5-HT<sub>1 ha </sub>is relatively short, and only six transmembrane domains are predicted, implying a truncated receptor. Phylogenetic analysis with known 5-HT receptor genes suggests that 5-HT<sub>1 ha </sub>belongs to the type 1 5-HT receptor family. Expression analysis by RT-PCR showed that 5-HT<sub>1 ha </sub>mRNA was present in all tissues examined, including the neural ganglia and gonad tissues. Immunocytochemistry revealed the presence of 5-HT<sub>1 ha </sub>specifically within the soma of neuronal cells located in the outer cortex of both cerebral and pleuropedal ganglia. In ovarian and testicular tissues, 5-HT<sub>1 ha </sub>immunoreactivity was observed in epithelial cells of the outer capsule and connective tissue of the trabeculae to which the gamete follicles adhere. Whether this receptor transcript is translated to a functional protein needs to be verified, but if so, it could play a role in reproduction.<br /><br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Springer |
Relação |
http://dro.deakin.edu.au/eserv/DU:30029091/hanna-molecularcharacteriazation-2009.pdf http://dx.doi.org/10.1007/s00418-009-0555-7 |
Direitos |
2009, Springer-Verlag |
Palavras-Chave | #Serotonin receptor #Abalone #Ganglia #Gonads |
Tipo |
Journal Article |