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Localization of NaK ATPase activity in the nautilus siphuncle

✍ Scribed by Greenwald, L. ;Verderber, Gustav ;Singley, Carl

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
565 KB
Volume
229
Category
Article
ISSN
0022-104X

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✦ Synopsis

The siphuncle of the chambered nautilus (Nautilus spp) can transport carneral liquid against osmotic pressure gradients, and is presumed to be able to transport against hydrostatic pressure gradients. It is hypothesized that the mechanism of such transport involves "local osmosis'' in which the siphuncle actively transports sodium into the blind-ended sacs of the siphuncle cells' basolateral labyrinth. This study supports this hypothesis since Na-K ATPase activity was localized only over the membranes of the labyrinth. The appearance of the reaction product required potassium and was inhibited by ouabain, a specific inhibitor of the Na-K ATPase.

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