Regulation of membrane lipid bilayer structure during salinity adaptation: a study with the gill epithelial cell membranes of Oreochromis niloticus.
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.
Department of Zoology, Goa University, Taleigao, Panaji, Goa.403206, India.
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P
Shivkamat
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R
Roy
D000818:Animals; D002462:Cell Membrane / Q000378:metabolism*; D023681:Cichlids / Q000378:metabolism*; D004847:Epithelial Cells / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D007477:Ions; D008051:Lipid Bilayers / Q000737:chemistry* / Q000378:metabolism; D008861:Microsomes / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism; D010743:Phospholipids / Q000737:chemistry; D011188:Potassium / Q000494:pharmacology; D012492:Salts / Q000378:metabolism; D012964:Sodium / Q000494:pharmacology; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D013696:Temperature
D005227:Fatty Acids; D007477:Ions; D008051:Lipid Bilayers; D010743:Phospholipids; D012492:Salts; D012964:Sodium; D005954:Glucosephosphate Dehydrogenase; D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium