Abstract
We investigated the relationship between body size, Na+-K+-ATPase molecular activity, and membrane lipid composition in the kidney of five mammalian and eight avian species ranging from 30-g mice to 280-kg cattle and 13-g zebra finches to 35-kg emus, respectively. Na+-K+-ATPase activity was found to be higher in the smaller species of both groups. In small mammals, the higher Na+-K+-ATPase activity was primarily the result of an increase in the molecular activity (turnover rate) of individual enzymes, whereas in small birds the higher Na+-K+-ATPase activity was the result of an increased enzyme concentration. Phospholipids from both mammals and birds contained a relatively constant percentage of unsaturated fatty acids; however, phospholipids from the smaller species were generally more polyunsaturated, and a complementary significant allometric increase in monounsaturate content was observed in the larger species. In particular, the relative content of the highly polyunsaturated docosahexaenoic acid [22:6( n-3)] displayed the greatest variation with body mass, scaling with allometric exponents of −0.21 and −0.26 in the mammals and birds, respectively. This allometric variation in fatty acid composition was correlated with Na+-K+-ATPase molecular activity in mammals, whereas in birds molecular activity only correlated with membrane cholesterol content. These relationships are discussed with respect to the metabolic intensity of different-sized animals.
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Dates
Type | When |
---|---|
Created | 20 years, 10 months ago (Sept. 30, 2004, 8:33 p.m.) |
Deposited | 4 years, 2 months ago (June 25, 2021, 10:55 p.m.) |
Indexed | 1 year, 1 month ago (July 16, 2024, 11:04 a.m.) |
Issued | 20 years, 7 months ago (Jan. 1, 2005) |
Published | 20 years, 7 months ago (Jan. 1, 2005) |
Published Print | 20 years, 7 months ago (Jan. 1, 2005) |
@article{Turner_2005, title={Relationship between body size, Na+-K+-ATPase activity, and membrane lipid composition in mammal and bird kidney}, volume={288}, ISSN={1522-1490}, url={http://dx.doi.org/10.1152/ajpregu.00297.2004}, DOI={10.1152/ajpregu.00297.2004}, number={1}, journal={American Journal of Physiology-Regulatory, Integrative and Comparative Physiology}, publisher={American Physiological Society}, author={Turner, Nigel and Haga, Kurt L. and Hulbert, A. J. and Else, Paul L.}, year={2005}, month=jan, pages={R301–R310} }