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Glucose induces the translocation and the aggregation of glycogen synthase in rat hepatocytes.

Incubation of rat hepatocytes with glucose results in a decrease in the amount of glycogen synthase activity found in supernatants obtained after centrifugation of cell homogenates at 9200 g. The enzymic activity was quantitatively recovered in the sediments. This effect of translocation was dose- and time-dependent and correlated with the amount of immunoreactive enzyme determined by immunoblotting in both fractions. Hydrolysis by alpha-amylase of glycogen accumulated upon incubation with the sugar did not affect the translocation pattern. Translocation was also observed when cells were incubated with 2-deoxyglucose, which did not result in accumulation of glycogen. Immunocytochemical evidence indicates that glucose induces the aggregation of glycogen synthase molecules into clusters which are recovered in the sediments. These results indicate that glucose, in addition to activating glycogen synthase, may trigger changes in the localization of the enzyme in the cell.