Temperature compensation of sodium transport and ATPase activity in frog skin
Article first published online: 8 DEC 2008
© 1979 Scandinavian Physiological Society
Acta Physiologica Scandinavica
Volume 106, Issue 2, pages 151–158, June 1979
How to Cite
LAGERSPETZ, K. Y. H. and SKYTTÄ, M. (1979), Temperature compensation of sodium transport and ATPase activity in frog skin. Acta Physiologica Scandinavica, 106: 151–158. doi: 10.1111/j.1748-1716.1979.tb06384.x
- Issue published online: 8 DEC 2008
- Article first published online: 8 DEC 2008
- Received 14 Nov. 1978.
- Temperature compensation;
- sodium transport;
- A TPases;
- Rana temporaria
Na+ transport across frog skin, measured as short-circuit current (SCC) shows perfect temperature compensation in frogs acclimated to 6°, 12°, and 23°C as SCC values observed at the acclimation temperatures are equal (about 13 μA/cm2). Reacclimation experiments show that this is not a starvation effect. While very little temperature compensation is seen in the activity of Na+, K+-ATPase in epidermal homogenates from frog skins, the activity of Mg2+-ATPase shows inverse compensation at assay temperatures from 4o to 48oC. This ATPase is apparently activated either by Mg2+ or by Ca2+ and it probably controls the passive permeability of epidermal cells. It is suggested that the inverse temperature compensation in the activity of this enzyme is the main mechanism by which the observed perfect temperature compensation of Na+ transport across frog skin occurs.