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2021-09-07 - Article/Dans un journal avec peer-review - Anglais - 36 page(s)

Tinoco Ana B, Barreiro-Iglesias Antón, Alfonso Yanez Guerra Luis, Delroisse Jérôme , Zhang Ya, Gunner Elizabeth F, Zampronio Cleidiane G, Jones Alexandra M, Egertova Michaela, Elphick Maurice R., "Ancient role of sulfakinin/cholecystokinin-type signalling in inhibitory regulation of feeding processes revealed in an echinoderm" in eLife

  • Edition : eLife Sciences Publications (United Kingdom)
  • Codes CREF : Biologie moléculaire (DI3111), Biologie (DI3100), Sciences exactes et naturelles (DI1000), Ecologie (DI3123), Zoologie générale (DI3160)
  • Unités de recherche UMONS : Biologie des Organismes Marins et Biomimétisme (S864)
  • Instituts UMONS : Institut des Biosciences (Biosciences)
  • Centres UMONS : Biosys (BIOSYS)
Texte intégral :

Abstract(s) :

(Anglais) Sulfakinin (SK)/cholecystokinin (CCK)-type neuropeptides regulate feeding and digestion in protostomes (e.g. insects) and chordates. Here, we characterised SK/CCK-type signalling for the first time in a non-chordate deuterostome - the starfish Asterias rubens (phylum Echinodermata). In this species, two neuropeptides (ArSK/CCK1, ArSK/CCK2) derived from the precursor protein ArSK/CCKP act as ligands for an SK/CCK-type receptor (ArSK/CCKR) and these peptides/proteins are expressed in the nervous system, digestive system, tube feet, and body wall. Furthermore, ArSK/CCK1 and ArSK/CCK2 cause dose-dependent contraction of cardiac stomach, tube foot, and apical muscle preparations in vitro, and injection of these neuropeptides in vivo triggers cardiac stomach retraction and inhibition of the onset of feeding in A. rubens. Thus, an evolutionarily ancient role of SK/CCK-type neuropeptides as inhibitory regulators of feeding-related processes in the Bilateria has been conserved in the unusual and unique context of the extra-oral feeding behaviour and pentaradial body plan of an echinoderm.