Regulation of membrane lipid bilayer structure during salinity adaptation: a study with the gill epithelial cell membranes of Oreochromis niloticus |
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Authors: | Shivkamat P Roy R |
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Institution: | Department of Zoology, Goa University, Taleigao, Panaji, Goa.403206, India. |
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Abstract: | A significant variation in the membrane fluidity (as assessed by DPH-fluorescence polarisation) and membrane lipid bilayer composition is noticed in the subcellular membranes of the gill epithelial cells of Oreochromis niloticus due to exposure of the fish to 1% saline water for 1 month. Also, a 70% enhanced activity of Na(+)-K(+)-ATPase in plasma membranes and a 2.5-fold increase of glucose-6-phosphate dehydrogenase in microsomal membranes are recorded in the treated fish. The changed membrane structure and fluidity along with the changed enzymatic activity of Na(+)-K(+)-ATPase help the influx the Na(+) rather than the efflux of K(+) through the gill epithelial cells during salinity adaptation. |
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