Sodium- and potassium-activated adenosine triphosphatase in the excretory organs of Sepia officinalis (Cephalopoda)
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- Donaubauer, H.H. Mar. Biol. (1981) 63: 143. doi:10.1007/BF00406822
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Sodium- and potassium-activated ATPase (Na+−K+-ATPase) has been demonstrated in excretory organs of Sepia officinalis, using a cytochemical procedure. In the renal appendages, both epithelia of the pancreatic appendages, the folded epithelium of the branchial heart appendage and the transport-active epithelium of the gill, the enzyme is localized exclusively in the basolateral cell membranes, i.e., the membranes of the basal labyrinth and the lateral plasma membranes. In addition, Na+−K+-ATPase is also located in the sarcolemma of the muscle fibres of the branchial heart. Distribution and localization of the enzyme is further substantiated by [3H]-ouabain autoradiography. The possible involvement of Na+−K+-ATPase in the excretion of ammonia and in ionic regulation in dibranchiate cephalopods is discussed.