title: Food deprivation induces chronic stress and affects thyroid hormone metabolism in Senegalese sole (Solea senegalensis) post-larvae.
abstract: In vertebrates, stress and thyroid systems interact closely, most likely because of the involvement of both systems in energy metabolism. However, studies on these interactions, especially during larval development, are scarce. Recently, cDNAs coding for corticotropin-releasing hormone (CRH) and CRH-binding protein (CRH-BP), two key players in the regulation of the neuroendocrine stress response, were characterized for the flatfish Senegalese sole (Solea senegalensis). To investigate the involvement of stress and thyroid systems in this species, the effects of food deprivation during early development of S. senegalensis were assessed. Growth was arrested in food-deprived post-larvae, which was also reflected by decreased carbon and nitrogen contents, indicating increased catabolism. Food deprivation induces chronic stress, as illustrated by enhanced whole-body cortisol levels, as well as an up regulation of crh and a decrease of crh-bp expression levels. Furthermore, whole-body total T3 concentrations of food-deprived post-larvae were reduced, although tshβ subunit expression levels remained unaffected. Our results show that food deprivation is a chronic stressor that induces energy-releasing catabolic processes that compensate for the reduced energy intake, and inhibits anabolic processes via the peripheral thyroid system.
authors.affiliation: Department of Biology, Faculty of Marine and Environmental Sciences, University of Cádiz, 11510 Puerto Real (Cádiz), Spain. yvette.wunderink@uca.es
authors.forename: Yvette S
authors.initials: YS
authors.lastname: Wunderink
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Martínez-Rodríguez
authors.forename: Manuel
authors.initials: M
authors.lastname: Yúfera
authors.forename: Ignacio Martín
authors.initials: IM
authors.lastname: Montero
authors.forename: Gert
authors.initials: G
authors.lastname: Flik
authors.forename: Juan M
authors.initials: JM
authors.lastname: Mancera
authors.forename: Peter H M
authors.initials: PH
authors.lastname: Klaren
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D003346:Corticotropin-Releasing Hormone / Q000235:genetics / Q000378:metabolism; D029941:Fish Proteins / Q000378:metabolism*; D005412:Flatfishes / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D005508:Food Deprivation / Q000502:physiology*; D015870:Gene Expression; D006854:Hydrocortisone / Q000378:metabolism; D007814:Larva / Q000254:growth & development / Q000378:metabolism / Q000502:physiology; D013312:Stress, Physiological; D037322:Thyrotropin, beta Subunit / Q000235:genetics / Q000378:metabolism; D013974:Thyroxine / Q000378:metabolism*; D014284:Triiodothyronine / Q000378:metabolism*; D015430:Weight Gain
chemical_list: D002352:Carrier Proteins; D029941:Fish Proteins; D037322:Thyrotropin, beta Subunit; D014284:Triiodothyronine; C067133:corticotropin releasing factor-binding protein; D003346:Corticotropin-Releasing Hormone; D013974:Thyroxine; D006854:Hydrocortisone