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On the mechanism of the crabtree effect in mouse ascites tumor cells

✍ Scribed by Leonard A. Sauer

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
341 KB
Volume
93
Category
Article
ISSN
0021-9541

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✦ Synopsis

Abstract

The addition of glucose to ELD and ELT/B1 mouse ascites tumor cell suspensions caused a 2.3‐fold increase in the phosphorylation state ratio, (ATP)/(ADP)(Pi), because of a decrease in the intracellular Pi concentration. The addition of glucose to these cell suspensions has been reported by Chance and Hess ('59) to cause an increase in the steady state reduction of cytochrome b and an increase in the steady state oxidation of cytochrome c. On a quantitative basis these two independent measurements suggest that a near equilibrium exists between the oxidation‐reduction state of the mitochondrial electron carriers and the reactions of ATP synthesis (as expressed by the phosphorylation state ratio) both before and after glucose addition. We conclude that the mechanism of the inhibition of respiration by glycolysis (the Crabtree effect) is a decrease in the rate of electron transport caused by the mass action effect of the elevated phosphorylation state ratio.

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