Abstract
The effect of streptozotocin-induced diabetes on 125I-labeled epidermal growth factor (EGF) binding was studied in microsomal membranes from rat liver. The binding of EGF in membranes from diabetic animals was significantly low, the value being about 60% of the control level. Scatchard analysis of the binding data clearly showed that the decreased in EGF binding was due to a decrease in the number of receptors. Treatment of diabetic animals with insulin restored EGF receptors to control levels, whereas the treatment with triiodothyronine had no effect. Serum EGF concentrations measured were almost the same among the control, diabetic, and insulin-treated diabetic groups. These results suggest that insulin deficiency in vivo causes a decrease in hepatic EGF receptors.
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