engleski

Na, K-ATPase and Na/Ca exchange activities in gills of hyperregulating Carcinus maenas

Na, K-ATPase and Na/Ca exchange activities were studied in gills of Carcinus maenas in seawater (SW) and dilute seawater (DSW). In DSW total Na, K-ATPase quadrupled ; Na/Ca exchange specific activities was unaffected, and total activity increased 1.67- fold. A negative correlation between branchial Na, K-ATPase activity and cAMP content points to rapid regulation of Na, K-ATPase through cAMP-dependent protein kinase A activity. Ca transport may depend on the high capacity Na/Ca exchange coupled to the versatile sodium pump.

crab; sodium transport; ouabain; adenosine 3; 5-cyclic monophosphate

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