Effects of seawater and freshwater challenges on the Gh/Igf system in the saline-tolerant blackchin tilapia (Sarotherodon melanotheron)

Link Karl, Shved Natallia, Serrano Nabil, Akgül Gülfirde, Caelers Antje, Faass Olivier, Mouttet Farouhar, Raabe Oksana, D'Cotta Carreras Hélèna, Baroiller Jean-François, Eppler Elisabeth. 2022. Effects of seawater and freshwater challenges on the Gh/Igf system in the saline-tolerant blackchin tilapia (Sarotherodon melanotheron). Frontiers in Endocrinology, 13:976488, 14 p.

Résumé : Prolactin (Prl) and growth hormone (Gh) as well as insulin-like growth factor 1 (Igf1) are involved in the physiological adaptation of fish to varying salinities. The Igfs have been also ascribed other physiological roles during development, growth, reproduction and immune regulation. However, the main emphasis in the investigation of osmoregulatory responses has been the endocrine, liver-derived Igf1 route and local regulation within the liver and osmoregulatory organs. Few studies have focused on the impact of salinity alterations on the Gh/Igf-system within the neuroendocrine and immune systems and particularly in a salinity-tolerant species, such as the blackchin tilapia Sarotherodon melanotheron. This species is tolerant to hypersalinity and saline variations, but it is confronted by severe climate changes in the Saloum inverse estuary. Here we investigated bidirectional effects of increased salinity followed by its decrease on the gene regulation of prl, gh, igf1, igf2, Gh receptor and the tumor-necrosis factor a. A mixed population of sexually mature 14-month old blackchin tilapia adapted to freshwater were first exposed to seawater for one week and then to fresh water for another week. Brain, pituitary, head kidney and spleen were excised at 4 h, 1, 2, 3 and 7 days after both exposures and revealed differential expression patterns. This investigation should give us a better understanding of the role of the Gh/Igf system within the neuroendocrine and immune organs and the impact of bidirectional saline challenges on fish osmoregulation in non-osmoregulatory organs, notably the complex orchestration of growth factors and cytokines.

Mots-clés Agrovoc : adaptation physiologique, poisson d'eau douce, Oreochromis niloticus, physiologie de la reproduction, régulation physiologique

Mots-clés libres : Sarotherodon melanotheron, Salinity tolerance, Seawater, Freshwater, Gh/Igf

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Link Karl, Institute of Anatomy (CHE) - auteur correspondant
• Shved Natallia, Institute of Anatomy (CHE) - auteur correspondant
• Serrano Nabil, Institute of Anatomy (CHE)
• Akgül Gülfirde, Institute of Anatomy (CHE)
• Caelers Antje, Institute of Anatomy (CHE)
• Faass Olivier, Institute of Anatomy (CHE)
• Mouttet Farouhar, Institute of Anatomy (CHE)
• Raabe Oksana, University of Basel (CHE)
• D'Cotta Carreras Hélèna, CIRAD-PERSYST-UMR ISEM (FRA) ORCID: 0000-0003-2739-3476
• Baroiller Jean-François, CIRAD-PERSYST-UMR ISEM (FRA) ORCID: 0000-0002-0992-1725
• Eppler Elisabeth, Institute of Anatomy (CHE) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/602559/)

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