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Effect of experimental diabetes on the activity of hexokinase isoenzymes in tissues of the rat.

The effect of experimental diabetes on the activity of hexokinase isoenzymes was studied in a wide range of tissues of the rat. In the tissues known to require insulin for glucose phosphorylation, the activity of hexokinase was markedly decreased; the fall being mainly in the Type IV (Glucokinase) in liver and Type II in other tissues, these tissues also exhibit glucose underutilization in diabetes. In the tissues which are commonly known not to require insulin, the activity of Type I hexokinase was significantly increased, these tissues exhibit aspects of glucose overutilization in diabetes in particular kidney and lens. These changes are discussed in relation to Spiro's hypothesis of glucose under and overutilization in tissues in diabetes.