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KMID : 0894520090130040313
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Development & Reproduction
2009 Volume.13 No. 4 p.313 ~ p.320
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Effects of 3,5,3’-Triiodothyronine (T3) on Osmoregulation following Freshwater Acclimation in Starry Flounder
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Min Byung-Hwa
Lim Han-Kyu
Chang Young-Jin
Kim Young-Soo
Myeong Jeong-In
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Abstract
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The aim of this study was to test if 3,5,3’-triiodothyronine (T3) are involved in the osmoregulatory actions in euryhaline starry flounder Platichthys stellatus. We investigated osmoregulatory parameters (Na+, Cl－ and osmolality), blood cortisol and glucose in starry flounder acclimated to seawater (SW, 33 psu) and that were transferred and allowed to acclimate to freshwater (FW, 0 psu). Fish in SW were injected with T3 (5, 10, and 15 ㎍/g body weight) or vehicle (0.9% NaCl), and then transferred to FW. They were sampled 3 days after the transfer. With T3 at 10 ㎍/g, levels of plasma Na+ and Cl－ were significantly higher than in sham (only saline) and control fish (without hormone and saline). Osmolality was significantly higher after injection with T3 at 10 and 15 ㎍/g than in the control. However, T3 at 5 ㎍/g had no effect on hyper-osmoregulation. In this study, all dose of T3 induced a significant increases in plasma cortisol without glucose. These results suggest a positive hyper-osmoregulatory role of T3 in starry flounder to hypoosmotic environment, maybe a positive interaction of T3 with cortisol for maintenance of hyper-osmoregulatory ability.
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KEYWORD
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Platichthys stellatus, Freshwater acclimation, 3, 5, 3’-Triiodothyronine(T3), Osmoregulation
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