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Am J Physiol Endocrinol Metab 239: E30-E38, 1980;
0193-1849/80 $5.00
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AJP - Endocrinology and Metabolism, Vol 239, Issue 1 30-E38, Copyright © 1980 by American Physiological Society

ARTICLES

A model for carbon kinetics among plasma alanine, lactate, and glucose

D. M. Foster, G. Hetenyl Jr and M. Berman

To account for the exchange of carbon atoms among alanine, lactate, and glucose in vivo, [2,3-3H]- and [U-14C]alanine or [3-3H]- and [U-14C]glucose were injected simultaneously to nonanesthetized normal dogs. The concentrations in plasma of 14C-labeled alanine, lactate, and glucose, and the injected 3H-labeled substrate were followed for 160 min after injection of the tracers. An integrated kinetic model describing the exchange of carbon atoms among substrates was developed from these data. The analysis suggests that there is a very rapid exchange of the carboxyl carbon of alanine with lactate in contrast to carbons 2 and 3. The model was used to calculate the fluxes of carbon atoms among the substrates in a steady state. In normal dogs plasma alanine and lactate contribute 14% of the carbon atoms released into the circulation as glucose.


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