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- W1573844152 abstract "Atrial 6-phosphofructo-1-kinase activity from the hearts of diabetic rats was decreased by 50%, but ventricular 6-phosphofructo-1-kinase activity was found not to be insulin-sensitive. This decrease in atrial 6-phosphofructo-1-kinase activity during diabetes was characterized by diminished levels of all three types of 6-phosphofructo-1-kinase subunits. As shown by immunological titration and column chromatography, the population of native 6-phosphofructo-1-kinase isozymes in the ventricles was not measurably affected during insulin deprivation. However, the atrial isozyme population in diabetic rat heart appeared to contain, on a relative basis, higher levels of the isozymic forms containing the L-type subunit. Measurement of the levels of this subunit indicated that in diabetic atria it was less affected than the other subunits. In the ventricles, insulin deficiency did not promote significant losses of fructose-2,6-P2; but, in diabetic rats, the atrial levels of this activator were decreased by 80% and subsequently restored by insulin treatment. These data suggest that any insulin-mediated effects on ventricular 6-phosphofructo-1-kinase activity and resultant effects on ventricular glycolysis do not appear to be exerted through changes in enzyme concentration, but probably through changes in modulators other than fructose-2,6-P2. In contrast to the ventricles, it appears that insulin exerts its effects on atrial 6-phosphofructo-1-kinase activity and, in part, influences atrial glycolysis through alteration of fructose-2,6-P2 levels, enzyme concentration, and isozymic content." @default.
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- W1573844152 date "1986-06-01" @default.
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- W1573844152 title "Insulin-mediated regulation of heart atrial and ventricular 6-phosphofructo-1-kinase." @default.
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- W1573844152 doi "https://doi.org/10.1016/s0021-9258(19)57477-4" @default.
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