Insulin receptor biosynthesis in cultured lymphocytes from insulin-resistant patients.

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Insulin receptor biosynthesis in cultured lymphocytes from insulin-resistant patients.

In some patients with genetic forms of extreme insulin resistance, the cause of insulin resistance is a marked (greater than or equal to 90%) reduction in the number of insulin receptors on the cell surface. In the present work, we describe studies of insulin receptor biosynthesis in Epstein-Barr virus (EBV)-transformed lymphocytes from three patients (A-1, A-5, and A-8) with type A extreme ins...

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Exposure of cells to phorbol 12-myristate 13-acetate (PMA) has been reported to result in resistance to the acute biological effects of insulin and an associated reduction in insulin-receptor tyrosine kinase activity. To investigate the relationship of insulin receptor autophosphorylation with a longer-term action of insulin the effect of PMA on insulin-stimulated receptor down-regulation was e...

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Insulin-induced receptor loss in cultured human lymphocytes is due to accelerated receptor degradation.

We have measured the turnover rate of the polypeptide subunits of the insulin receptor in cultured human lymphocytes (IM-9 line) and have investigated the mechanism of insulin-induced receptor loss. To estimate the rate of receptor degradation, lymphocytes were either pulse-labeled with [35S]methionine or surface labeled with Na125I and lactoperoxidase. The insulin receptor was isolated by immu...

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In the wake of the worldwide increase in type-2 diabetes, a major focus of research is understanding the signaling pathways impacting this disease. Insulin signaling regulates glucose, lipid, and energy homeostasis, predominantly via action on liver, skeletal muscle, and adipose tissue. Precise modulation of this pathway is vital for adaption as the individual moves from the fed to the fasted s...

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ژورنال

عنوان ژورنال: Journal of Clinical Investigation

سال: 1985

ISSN: 0021-9738

DOI: 10.1172/jci112247