Diabetes 45:1003-1009, 1996
© 1996 by the American Diabetes Association, Inc.
Hexosamines and insulin resistance
ABSTRACT
Glucose is an important regulator of cell growth and metabolism. Thus,
it is likely that some of the adverse effects of hyperglycemia are
reflections of normal regulation by abnormal concentrations of glucose. How
the cell senses glucose, however, is still incompletely understood.
Evidence has been presented that the hexosamine biosynthesis pathway serves
this function for regulation of aspects of glucose uptake, glycogen
synthesis, glycolysis, and synthesis of growth factors. Excess hexosamine
flux causes insulin resistance in cultured cells, tissues, and intact
animals. Further evidence for the possible role of this pathway in normal
glucose homeostasis and disease is that the level of activity of the
rate-limiting enzyme in hexosamine synthesis,
glutamine:fructose-6-phosphate amidotransferase, is correlated with glucose
disposal rates (GDRs) in normal humans and transgenic mice.

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