Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/94731
標題: A Stenohaline Medaka, Oryzias woworae, Increases Expression of Gill Na(+), K(+)-ATPase and Na(+), K(+), 2Cl(-) Cotransporter 1 to Tolerate Osmotic Stress
作者: Juo, Jiun-Jang
Kang, Chao-Kai
Yang, Wen-Kai
Yang, Shu-Yuan
Lee, Tsung-Han
楊文凱
關鍵字: 2Cl- cotransporter 1
K+
K+-ATPase
Na+
Oryzias woworae
gill
osmotic stress
stenohaline
Adaptation, Physiological
Animals
Gene Expression Regulation, Enzymologic
Gills
Oryzias
Osmotic Pressure
Phylogeny
Salinity
Sodium-Potassium-Chloride Symporters
Sodium-Potassium-Exchanging ATPase
Species Specificity
Water
摘要: The present study aimed to evaluate the osmoregulatory mechanism of Daisy's medaka, O. woworae,as well as demonstrate the major factors affecting the hypo-osmoregulatory characteristics of euryhaline and stenohaline medaka. The medaka phylogenetic tree indicates that Daisy's medaka belongs to the celebensis species group. The salinity tolerance of Daisy's medaka was assessed. Our findings revealed that 20‰ (hypertonic) saltwater (SW) was lethal to Daisy's medaka. However, 62.5% of individuals survived 10‰ (isotonic) SW with pre-acclimation to 5‰ SW for one week. This transfer regime, "Experimental (Exp.) 10‰ SW", was used in the following experiments. After 10‰ SW-transfer, the plasma osmolality of Daisy's medaka significantly increased. The protein abundance and distribution of branchial Na(+), K(+)-ATPase (NKA) and Na(+), K(+), 2Cl(-) cotransporter 1 (NKCC1) were also examined after transfer to 10‰ SW for one week. Gill NKA activity increased significantly after transfer to 10‰ SW. Meanwhile, elevation of gill NKA αα-subunit protein-abundance was found in the 10‰ SW-acclimated fish. In gill cross-sections, more and larger NKA-immunoreactive (NKA-IR) cells were observed in the Exp. 10‰ SW medaka. The relative abundance of branchial NKCC1 protein increased significantly after transfer to 10‰ SW. NKCC1 was distributed in the basolateral membrane of NKA-IR cells of the Exp. 10‰ SW group. Furthermore, a higher abundance of NKCC1 protein was found in the gill homogenates of the euryhaline medaka, O. dancena, than in that of the stenohaline medaka, O. woworae.
URI: http://hdl.handle.net/11455/94731
ISSN: 0289-0003
Appears in Collections:生命科學系所

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