Oxygen consumption (QO2) of single isolated axons and their associated glial cell sheath was investigated under a variety of conditions to determine the contribution of each cell type to whole tissue QO2. It was found that the QO2 of the sheath, in the absence of a functional axon, represented approximately 30% of the total tissue QO2. When the axon was injected with carboxyatractyloside, an inhibitor of mitochondrial oxidative phosphorylation that is membrane impermeant, electrophysiological properties of the axon were not affected and glial sheath respiratory activity was stimulated by 1.7 to 2.7 times the untreated control level. These results suggest that glial cell metabolic activity is regulated by the metabolic activity of the axon. Depending on the experimental conditions the glial sheath accounts for 30% to nearly 100% of the QO2 of axon-glial cell tissue. On the basis of these and morphometric measurements we estimate that in a normally functioning axon-glial cell system the glial sheath accounts for 90% of the tissue QO2.
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