Increased insulin receptor binding in erythrocytes from growth hormone-deficient children |
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Authors: | N. Dávila B. Barceló M. C. Carranza C. Calle |
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Affiliation: | (1) Servicio de Endocrinología, Clínica Puerta de Hierro, Universidad Autónoma de Madrid, 28040 Madrid, Spain;(2) Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad Complutense, 28040 Madrid, Spain |
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Abstract: | Erythrocytes from growth hormone-deficient children (GHd-children) (n=10) showed a statistically significant increase in insulin binding at low unlabeled insulin concentrations, together with a threefold decrease in apparent receptor affinity, as compared to control children (C) (n=11). Scatchard analysis of the binding data using the two-site model revealed that both the receptor concentration R1 [GHd-children 0.10±0.01 ng/ml and C 0.03±0.002 ng/ml] and the dissociation constant KD1 [GHd-children (0.48±0.05)×10–9M and C (0.19±0.01)×10–9M] for high affinitylow capacity sites were significantly increased in erythrocytes from GHd-children, while neither receptor concentrations (R2) nor the dissociation constant (KD2) for low affinity-high capacity sites proved to be altered. These events were accompanied by a normal sensitivity to insulin as well as glucose tolerance in the GHd-group. The meaning of the increased insulin binding with normal insulin sensitivity in GH-deficiency is discussed. |
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Keywords: | insulin receptors erythrocytes insulin sensitivity growth hormone-deficient children |
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