JBC INTERFERin siRNA transfection reagent

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JBC, Vol. 250, Issue 20, 7961-7967, Oct, 1975

Metabolic implications of the distribution of the alanine aminotransferase isoenzymes

G. DeRosa and R. W. Swick

The distribution of alanine aminotransferase isozymes in several tissues from several species has been studied. In glycolytic tissues, such as skeletal and cardiac muscle, cytosolic alanine aminotransferase was the predominant form. In gluconeogenic tissues, such as liver and kidney, the concentration of the cytosolic alanine aminotransferase was much more variable; its presence, however, may be correlated with the presence of phosphoenolpyruvate carboxykinase in the same compartment. The particulate enzyme was found associated only with the matrix of the mitochondria. It was present only in those gluconeogenic tissues that can utilize alanine for glucose production, e.g. rat liver and pig liver and kidney; it was absent from rat kidney which cannot convert alanine to glucose. These observations, together with the kinetic parameters of the two isozymes, suggest that in vivo, mitochondrial alanine aminotransferase is involved in the conversion of alanine to pyruvate, while the cytosolic isoenzyme is mainly involved in the formation of alanine from pyruvate.
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