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On the mechanism of the crabtree effect in mouse ascites tumor cells
Author(s) -
Sauer Leonard A.
Publication year - 1977
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1040930218
Subject(s) - respiration , phosphorylation , intracellular , glycolysis , electron transport chain , steady state (chemistry) , biochemistry , chemistry , cytochrome , cytochrome c , pi , metabolism , biophysics , mitochondrion , biology , enzyme , botany
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.