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Enzymatic basis for the active transport of sodium in the eccrine sweat gland. Localization and characterization of Na-K-adenosine triphosphatase.

1. The characteristics of the Na-K-ATPase of the rhesus monkey palm eccrine sweat gland were studied. The maximal activation concentrations for Na + and K + were 200 mM and 40 mM respectively. 2. An attempt was made to estimate the stoichiometric relationship between Na + flux and ATP hydrolysis by the Na-K-ATPase activity obtained in this study and ATP production estimated from CO 2 and lactate production reported in our previous paper (1). Na + /ATP ratios of 3.3 and 3.0 respectively were obtained, which agree well with the usual ratio of 3 found in other transporting epithelia. 3. The distal (straight) duct was isolated and its Na-K-ATPase activity determined. The Na-K-ATPase activity in the distal duct was less than one tenth of that in the sweat gland coil (secretory coil + proximal duct) and thus the role of the distal duct as a site of active sodium transport would be relatively minor.