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. 1985 Jan;37(1):73–88.

Leprechaunism: an inherited defect in a high-affinity insulin receptor.

L J Elsas, F Endo, E Strumlauf, J Elders, J H Priest
PMCID: PMC1684537  PMID: 3883764

Abstract

We examined in vivo oral glucose tolerance tests and in vitro insulin binding, cellular response, and insulin-receptor structure of fibroblasts cultured from the skin of a patient with leprechaun syndrome and her parents. In response to oral glucose, the proband exhibited marked hyperinsulinism (maximum plasma insulin = 4,120 microU/ml), the father had mild hyperinsulinism (maximum plasma insulin = 240 microU/ml), and the mother was normal. [125I]insulin binding to monolayers of intact fibroblasts demonstrated complex kinetics that were interpreted using a two-receptor model. Normal high-affinity binding had an apparent KA of 1.6 X 10(10)/molar with 1,100 sites/cell. The proposed low-affinity state receptor had an apparent KA of 6.8 X 10(7)/molar with approximately 30,000 sites/cell. Insulin binding to the proband's cells had no high-affinity binding but had normal low-affinity binding. Cells from the mother had 60%, and cells from the father, 2%, of control insulin binding to the high-affinity receptor, but normal, low-affinity site binding. Two different, insulin-stimulable responses were evaluated under experimental conditions identical with those used for insulin binding. Insulin stimulation of 2-methylaminoisobutyric acid uptake occurred with half-maximal responses between 25 and 50 ng/ml insulin. This response was similar in cells from controls and the patient. By contrast, the uptake and phosphorylation of 2-deoxy-D-glucose was stimulated at half-maximal insulin concentrations between 1 and 10 ng/ml in control cells but was not significantly increased in the proband's cells until 1,000 ng/ml concentrations of insulin were attained. In affinity crosslinking experiments, [125I]insulin was covalently bound to insulin receptors of fibroblast membranes using disuccinimidylsuberate. [125I]insulin specifically bound to 125,000 dalton monomeric subunits and 250,000 dalton dimers. In control cells, the ratio of monomer to dimer was approximately one, but significantly fewer dimers were crosslinked in insulin receptors from the patient's cells. We conclude that in this family two different recessive mutations impair high-affinity insulin-receptor binding and that the proband with leprechaunism is a compound heterozygote for these mutations. The two mutations produced structural changes in the receptor that altered subunit interactions and loss of high-affinity binding and cellular responsivity.

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Selected References

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