Effect of repetitive cortisol and thyroxine injections on chloride cell number and Na+/K+-ATPase activity in gills of freshwater acclimated rainbow trout,Salmo gairdneri |
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| Institution: | 1. Département Génie Électrique Informatique Industrielle. Université du Havre, 34 rue Boris Vian 76610, Le Havre, France;2. Department of Electrical, Systems and Automatics Engineering. Universidad de León. School of Mines Engineering, Campus de Vegazana s/n, 24071 León, Spain;3. Department of Naval, Electrical, Electronics and Communications Engineering, University of Genoa, Savona Campus, Via Opera Pia, 16145 Savona, Italy;1. School of Environmental Science and Engineering, Nanjing Tech University, Puzhu Nan Lu 30, Nanjing 211800, PR China;2. Department of Organic Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russia;1. Department of Mechanical Engineering, Faculty of Engineering, University of Isfahan, 81746-73441 Isfahan, Iran;2. Department of Physics, University of Gothenburg, Gothenburg, Sweden;1. Postgraduate Program in Dental Sciences, Department of Dentistry, Federal University of Rio Grande do Norte, Natal, RN, Brazil;2. Postgraduate Program in Dental Sciences, Department of Dentistry, Federal University of Rio Grande do Norte, Natal, RN, Brazil;3. Traumatology and Bucomaxillofacial Surgery, Federal University of Rio Grande do Norte, Natal, RN, Brazil |
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| Abstract: | - 1.1. Freshwater nonanadromous rainbow trout, Salmo gairdneri, were injected three times a week with either saline, 10μg cortisol/g, 1.0μg thyroxine/g or 10μg cortisol/g + 1.0μg thyroxine/g during a period of 28 days (12 injections). A separate group was derived as a subgroup from the thyroxine group on day 14 and received Cortisol + thyroxine from day 14 until day 28 (six injections).
- 2.2. Gill chloride cell number and Na+/K+-ATPase activity increased by cortisol treatment, the changes being significant on days 7 and 14, respectively.
- 3.3. Thyroxine treatment did not affect gill Na+/K+-ATPase activity or chloride cell number directly. Neither did it modify the stimulatory effect of cortisol on these parameters.
- 4.4. Muscle water decreased in cortisol-treated fish and increased in thyroxine-treated fish, while no changes were observed in the combined hormone groups.
- 5.5. No changes were observed in plasma chloride in any group during the experiment.
- 6.6. The results demonstrate a putative role of cortisol in stimulating hypo-osmoregulatory mechanisms and suggest that thyroxine is without a direct or a supportive effect for cortisol action.
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