|Reference : Effect of prolactin on alpha and beta chloride cells in the gill epithelium of the sa...|
|Scientific journals : Article|
|Life sciences : Anatomy (cytology, histology, embryology...) & physiology|
|Effect of prolactin on alpha and beta chloride cells in the gill epithelium of the saltwater adapted tilapia " Oreochromis niloticus"|
|Pisam, B. [Centre d'étude de Sarlay Gif sur Yvette > Biologie cellulaire et moléculaire > > >]|
|Auperin, B. [Institut Scientifique de Recherche Agronomique - INRA > Physiologie > > >]|
|Prunet, P. [Institut Scientifique de Recherche Agronomique - INRA > Physiologie > > >]|
|Rentier-Delrue, Françoise [Université de Liège - ULg > Département des sciences de la vie > Biologie et génétique moléculaire - GIGA-R : Coordination scientifique >]|
|Martial, Joseph [Université de Liège - ULg > > > >]|
|Rambourg, A. [Centre d'Etude de Sarclay > Biologie cellulaire et moléculaire > > >]|
|Yes (verified by ORBi)|
|[en] Saltwater adapted Tilapia ; prolactin ; Chloride cells|
|[en] Tilapia (Oreochromis niloticus), 21 g average body weight, were divided into two groups. A group was maintained in fresh water, whereas another group was adapted for 2 weeks to 20% salt water. Among the latter, fishes were injected every 2 days for a week with tilapia prolactin (ti-PRL I). Gills were prepared for electron microscopy in order to determine the types and surface areas of chloride cells in each experimental condition. Two types of chloride cells, the alpha and beta cells were easily distinguished on the basis of their location and ultrastructural features in the gills of freshwater fishes, while only one type of cell, the saltwater alpha cells presumably derived from the transformation of the freshwater alpha cells, were encountered in saltwater adapted animals. After PRL injection of saltwater adapted fishes, small chloride cells, which displayed ultrastructural features similar to those of beta cells in freshwater tilapia, reappeared in interlamellar regions of the gills. In the same experimental conditions, the voluminous saltwater alpha cells showed a tendency to resume ultrastructural features more characteristic of the freshwater alpha cells from which they were derived. These observations tend to indicate that prolactin behaves as a "freshwater adapting hormone" and that beta cells are specifically involved in fish adaptation to freshwater living conditions.|
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