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標題: | The relationship between 'deep-hole' mitochondria-rich cells and salinity adaptation in the euryhaline teleost, Oreochromis mossambicus | 作者: | Lee, T.H. 李宗翰 Hwang, P.P. Shieh, Y.E. Lin, C.H. |
關鍵字: | chloride cells;gills;mitochondria-rich cells;Na,K-ATPase;salinity;sodium pump;tilapia;branchial chloride cells;fresh-water;opercular epithelium;mozambique;tilapia;atpase activity;alpha-subunit;na+/k+-atpase;gill;expression;seawater | Project: | Fish Physiology and Biochemistry | 期刊/報告no:: | Fish Physiology and Biochemistry, Volume 23, Issue 2, Page(s) 133-140. | 摘要: | The present study elucidates the relationship between deep-hole MR cells (Lee et al. 1996) and salinity adaptation in tilapia (Oreochromis mossambicus). Freshwater tilapia were transferred to salt water of various salinities, i.e., 5 (hypotonic), 10 (isotonic), 20 (hypertonic), and 30 parts per thousand (hypertonic), for 2 weeks. The density of MR cells, protein content, activity, and localization of the sodium pump were examined. There was no significant difference in serum osmolarity and Na+, K+, Cl- levels in fish of the various treatment groups. The amounts of protein and activity of Na,K-ATPase were elevated in fish from SW with the highest salinity. MR cells observed by scanning electron microscope revealed small pits (0.5-1.0 mum in diameter) in groups from hypotonic and isotonic water and large crypts (2.4-3.8 mum in diameter) in fish from hypertonic water. Moreover, the density of these deep-hole MR cells increased significantly in fish adapted to hypertonic SW. Larger and more numerous deep-hole MR cells of euryhaline tilapia may account for higher protein amounts and activities of Na,K-ATPase, probably to meet the physiological demand of euryhaline teleosts engaged in hyporegulation. |
URI: | http://hdl.handle.net/11455/37769 | ISSN: | 0920-1742 | DOI: | 10.1023/a:1007818631917 |
Appears in Collections: | 生命科學系所 |
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