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The amount of 125I-insulin associated with freshly isolated hepatocytes was increased 50% in the presence of 0.2 mM chloroquine (CQ) after 2 h of incubation. The degradation of insulin by the hepatocytes incubated with CQ was significantly diminished as compared with control cells. Hepatocytes incubated with 125I-insulin in the presence of CQ showed a slower rate of ligand dissociation than control cells. More TCA-precipitable and less TCA-soluble material appeared in the dissociation buffer of CQ-treated cells. However, CQ inhibited only 25-35% of intracellular insulin degradation. Non-lysosomal intracellular insulin degradation appears to be responsible for the remaining portion of the ligand degradation by isolated hepatocytes.
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