Characterization of a tachykinin signalling system in the bivalve mollusc Crassostrea gigas

Abstract : Although tachykinin-like neuropeptides have been identified in molluscs more than two decades ago, knowledge on their function and signalling has so far remained largely elusive. We developed a cell-based assay to address the functionality of the tachykinin G-protein coupled receptor (Cragi-TKR) in the oyster Crassostrea gigas. The oyster tachykinin neuropeptides that are derived from the tachykinin precursor gene Cragi-TK activate the Cragi-TKR in nanomolar concentrations. Receptor activation is sensitive to Ala-substitution of critical Cragi-TK amino acid residues. The Cragi-TKR gene is expressed in a variety of tissues, albeit at higher levels in the visceral ganglia (VG) of the nervous system. Fluctuations of Cragi-TKR expression is in line with a role for TK signalling in C. gigas reproduction. The expression level of the Cragi-TK gene in the VG depends on the nutritional status of the oyster, suggesting a role for TK signalling in the complex regulation of feeding in C. gigas.
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Marie-Pierre Dubos, Sven Zels, Julie Schwartz, Jeremy Pasquier, Liliane Schoofs, et al.. Characterization of a tachykinin signalling system in the bivalve mollusc Crassostrea gigas. General and Comparative Endocrinology, Elsevier, 2018, ⟨10.1016/j.ygcen.2018.05.003⟩. ⟨hal-01838268⟩

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