Gill Na(+), K(+)-ATPase in a series of hyper-regulating gammarid amphipods: enzyme characterisation and the effects of salinity acclimation

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Steven J Brooks, Chris Lloyd Mills

Abstract

The enzyme Na(+), K(+)-ATPase was investigated in the gills of selected hyper-regulating gammarid amphipods. Gill Na(+), K(+)-ATPase was characterised with respect to the main cation and co-factor concentrations for the freshwater amphipod Gammarus pulex. The optimum cation and co-factor concentrations for maximal gill Na(+), K(+)-ATPase activity in G. pulex were 100mM Na(+), 15mM K(+), 15mM Mg(2+) and 5mM ATP, at pH 7.2. The effects of salinity acclimation on gill Na(+), K(+)-ATPase activity and haemolymph sodium concentrations was investigated in selected gammarid amphipods from different salinity environments. Maximal enzyme activity occurred in all gammarids when acclimated to the most dilute media. This maximal activity coincided with the largest sodium gradient between the haemolymph and the external media. As the haemolymph/medium sodium gradient decreased, a concomitant reduction in gill Na(+), K(+)-ATPase activity occurred. This implicates the involvement of gill Na(+), K(+)-ATPase in the active uptake of sodium from dilute media in hyper-regulating gammarids.

References

Jan 1, 1975·Annual Review of Physiology·I M Glynn, S J Karlish
Jun 30, 2000·Proceedings. Biological Sciences·J T Dick, D Platvoet
Jun 5, 2003·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Cedomil Lucu, David W Towle
Aug 2, 2003·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Steven J Brooks, Chris Lloyd Mills

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Citations

Nov 30, 2010·Ecotoxicology·Sophie Sroda, Carole Cossu-Leguille
Mar 29, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Steven J Brooks, Chris Lloyd Mills
Jul 28, 2011·Evolution; International Journal of Organic Evolution·Carol Eunmi LeeMarijan Posavi
Oct 28, 2014·Environmental Science & Technology·Judith TrappOlivier Geffard

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