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  • Title: Intermediate peptides of insulin degradation in liver and cultured hepatocytes of rats.
    Author: Takahashi S, Kato H, Seki T, Takahashi A, Noguchi T, Naito H.
    Journal: Int J Biochem; 1988; 20(12):1369-80. PubMed ID: 3072226.
    Abstract:
    1. Bestatin, a microbial aminopeptidase inhibitor, induced accumulation of low-molecular weight intermediate peptides of insulin degradation in liver of rats in vivo and in primary cultured rat hepatocytes. However, bestatin did not affect the association and internalization of the hormone into hepatic cells. 2. Results of the HPLC analyses showed that the intermediate peptides of insulin degradation are small ones and specifically accumulate only in the presence of bestatin. 3. The above results, together with those employing other protease inhibitors, show that cytosolic bestatin-sensitive protease(s), trypsin-like protease(s) and thiol protease(s) play an important role in the intracellular degradation process of insulin.
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