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Am J Physiol Regul Integr Comp Physiol 261: R1575-R1578, 1991;
0363-6119/91 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 261, Issue 6 1575-R1578, Copyright © 1991 by American Physiological Society

ARTICLES

Oxygen consumption and sodium pump thermogenesis in a developing mammal

P. L. Else
Department of Zoology, University of Melbourne, Parkville, Victoria, Australia.

During development the liver undergoes large changes in its oxygen consumption. The energy requirements of the sodium pump (i.e., ouabain-sensitive respiration) would appear to account for a major part of these changes. In very young rats (birth to 9 days), the sodium pump accounted for approximately 50% of a high weight-specific liver metabolism (LMR). In rats greater than or equal to 20 days of age, the sodium pump accounted for a smaller percentage (33%) of a much lower LMR. These changes scaled with body mass. LMR scaled with an allometric slope of -0.258, ouabain-sensitive respiration with a slope of -0.355, and ouabain-insensitive respiration with a slope of -0.194. It is proposed that changes in LMR of rats during development are due primarily to the changing energy requirements of the sodium pump.


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B. J. Wu, A. J. Hulbert, L. H. Storlien, and P. L. Else
Membrane lipids and sodium pumps of cattle and crocodiles: an experimental test of the membrane pacemaker theory of metabolism
Am J Physiol Regulatory Integrative Comp Physiol, September 1, 2004; 287(3): R633 - R641.
[Abstract] [Full Text] [PDF]


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