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Insulin receptors on hepatocytes and erythrocytes were studied in rats two and eight weeks after the injection of streptozotocin (50 mg/kg) to see if erythrocyte insulin receptors change parallel with hepatocyte insulin receptors in response to hypoinsulinemia. Insulin binding to hepatocytes increased two (14.0 +/- 2.5% v.s. 7.7 +/- 0.7%; P less than 0.025) and eight weeks (15.9 +/- 1.9% v.s. 6.6 +/- 1.1%; P less than 0.005) after the streptozotocin injection. Scatchard analysis revealed that this increase was due to a rise in both the receptor concentration and affinity. The number of receptors was comparable in the two- and eight-week-streptozotocin rats while the increase in the affinity was more pronounced in the latter group. Insulin binding to the erythrocytes was also increased in both two- (5.0 +/- 0.7% v.s. 4.2 +/- 0.6%) and eight-week- (4.3 +/- 0.6% v.s. 2.7 +/- 1.2%) streptozotocin rats. This increase was due to a rise in the receptor concentration rather than the affinity. However, compared to hepatocytes, these changes were inconsistent and statistically not significant. Furthermore, no correlation was obtained between the binding and plasma insulin concentration. These results indicate that insulin receptors on rat erythrocytes are less sensitive to a change in the plasma insulin concentration and do not always reflect accurately the receptor state on hepatocytes.

Insulin receptors on erythrocytes and hepatocytes from streptozotocin induced diabetic rats.