Insulin action rapidly modulates the apparent affinity of the insulin-like growth factor II receptor

C. L. Oppenheimer, Jeffrey E. Pessin, J. Massague, W. Gitomer, M. P. Czech

Research output: Contribution to journalArticle

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Abstract

Incubation of intact rat adipocytes with physiological concentrations of insulin stimulates binding of insulin-like growth factor II (IGF-II) to its receptor by 3- to 10-fold. The effect is temperature- and dose-dependent, with 0.1 nM insulin giving half-maximal stimulation. Scatchard analysis of IGF-II binding to intact adipocytes indicates that this effect is due to an apparent increase in receptor affinity, from K(d) = 63 nM in the absence of insulin to K(d) = 5.8 nM in the presence of 10 nM insulin, with no apparent change in the number of cell surface binding sites (220,000/cell). Scatchard analysis of 125I-IGF-II binding to isolated membrane fractions demonstrated that all IGF-II receptors in plasma membranes and low density microsomes from control cells are converted during homogenization to the high affinity form (K(d) = 2 to 6 nM) seen in insulin-treated intact adipocytes. No significant difference in affinity was observed between plasma membranes from control or insulin-treated adipocytes or between low density microsomes from control or insulin-treated cells. However, in apparent contrast to the results obtained in intact adipocytes, the number of binding sites is increased in the plasma membrane fraction from insulin-treated cells by an average of 60%, while the number of receptors is decreased by 40% in low density microsomes from insulin-treated cells compared to control cells. These results were confirmed by direct visualization of the M(r) = 270,000 IGF-II receptor band on dodecyl sulfate gels following affinity labeling with 125I-IGF-II and the cross-linker disuccinimidyl suberate. Scatchard analysis of the total cellular membranes showed no difference in the total number of binding sites between control and insulin-treated cells. These results demonstrate that insulin has two effects on the IGF-II receptor in adipocytes. 1) It rapidly increases the apparent affinity of the receptor in the intact cell without changing the apparent number of receptors on the cell surface; and 2) it induces a redistribution of the high affinity IGF-II receptor between plasma membranes and low density microsomes upon homogenization of cells and preparation of membranes. The latter effect closely parallels the insulin-induced membrane redistribution of the glucose transporter that occurs in the rat adipocyte by an unknown mechanism.

Original languageEnglish (US)
Pages (from-to)4824-4830
Number of pages7
JournalJournal of Biological Chemistry
Volume258
Issue number8
StatePublished - 1983
Externally publishedYes

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IGF Type 2 Receptor
Insulin
Adipocytes
Insulin-Like Growth Factor II
Cell membranes
Microsomes
Cell Membrane
Cells
Membranes
Binding Sites
Rats
Facilitative Glucose Transport Proteins
Cell Surface Receptors
Thermal effects
Labeling

ASJC Scopus subject areas

  • Biochemistry

Cite this

Insulin action rapidly modulates the apparent affinity of the insulin-like growth factor II receptor. / Oppenheimer, C. L.; Pessin, Jeffrey E.; Massague, J.; Gitomer, W.; Czech, M. P.

In: Journal of Biological Chemistry, Vol. 258, No. 8, 1983, p. 4824-4830.

Research output: Contribution to journalArticle

Oppenheimer, CL, Pessin, JE, Massague, J, Gitomer, W & Czech, MP 1983, 'Insulin action rapidly modulates the apparent affinity of the insulin-like growth factor II receptor', Journal of Biological Chemistry, vol. 258, no. 8, pp. 4824-4830.
Oppenheimer, C. L. ; Pessin, Jeffrey E. ; Massague, J. ; Gitomer, W. ; Czech, M. P. / Insulin action rapidly modulates the apparent affinity of the insulin-like growth factor II receptor. In: Journal of Biological Chemistry. 1983 ; Vol. 258, No. 8. pp. 4824-4830.
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AU - Czech, M. P.

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N2 - Incubation of intact rat adipocytes with physiological concentrations of insulin stimulates binding of insulin-like growth factor II (IGF-II) to its receptor by 3- to 10-fold. The effect is temperature- and dose-dependent, with 0.1 nM insulin giving half-maximal stimulation. Scatchard analysis of IGF-II binding to intact adipocytes indicates that this effect is due to an apparent increase in receptor affinity, from K(d) = 63 nM in the absence of insulin to K(d) = 5.8 nM in the presence of 10 nM insulin, with no apparent change in the number of cell surface binding sites (220,000/cell). Scatchard analysis of 125I-IGF-II binding to isolated membrane fractions demonstrated that all IGF-II receptors in plasma membranes and low density microsomes from control cells are converted during homogenization to the high affinity form (K(d) = 2 to 6 nM) seen in insulin-treated intact adipocytes. No significant difference in affinity was observed between plasma membranes from control or insulin-treated adipocytes or between low density microsomes from control or insulin-treated cells. However, in apparent contrast to the results obtained in intact adipocytes, the number of binding sites is increased in the plasma membrane fraction from insulin-treated cells by an average of 60%, while the number of receptors is decreased by 40% in low density microsomes from insulin-treated cells compared to control cells. These results were confirmed by direct visualization of the M(r) = 270,000 IGF-II receptor band on dodecyl sulfate gels following affinity labeling with 125I-IGF-II and the cross-linker disuccinimidyl suberate. Scatchard analysis of the total cellular membranes showed no difference in the total number of binding sites between control and insulin-treated cells. These results demonstrate that insulin has two effects on the IGF-II receptor in adipocytes. 1) It rapidly increases the apparent affinity of the receptor in the intact cell without changing the apparent number of receptors on the cell surface; and 2) it induces a redistribution of the high affinity IGF-II receptor between plasma membranes and low density microsomes upon homogenization of cells and preparation of membranes. The latter effect closely parallels the insulin-induced membrane redistribution of the glucose transporter that occurs in the rat adipocyte by an unknown mechanism.

AB - Incubation of intact rat adipocytes with physiological concentrations of insulin stimulates binding of insulin-like growth factor II (IGF-II) to its receptor by 3- to 10-fold. The effect is temperature- and dose-dependent, with 0.1 nM insulin giving half-maximal stimulation. Scatchard analysis of IGF-II binding to intact adipocytes indicates that this effect is due to an apparent increase in receptor affinity, from K(d) = 63 nM in the absence of insulin to K(d) = 5.8 nM in the presence of 10 nM insulin, with no apparent change in the number of cell surface binding sites (220,000/cell). Scatchard analysis of 125I-IGF-II binding to isolated membrane fractions demonstrated that all IGF-II receptors in plasma membranes and low density microsomes from control cells are converted during homogenization to the high affinity form (K(d) = 2 to 6 nM) seen in insulin-treated intact adipocytes. No significant difference in affinity was observed between plasma membranes from control or insulin-treated adipocytes or between low density microsomes from control or insulin-treated cells. However, in apparent contrast to the results obtained in intact adipocytes, the number of binding sites is increased in the plasma membrane fraction from insulin-treated cells by an average of 60%, while the number of receptors is decreased by 40% in low density microsomes from insulin-treated cells compared to control cells. These results were confirmed by direct visualization of the M(r) = 270,000 IGF-II receptor band on dodecyl sulfate gels following affinity labeling with 125I-IGF-II and the cross-linker disuccinimidyl suberate. Scatchard analysis of the total cellular membranes showed no difference in the total number of binding sites between control and insulin-treated cells. These results demonstrate that insulin has two effects on the IGF-II receptor in adipocytes. 1) It rapidly increases the apparent affinity of the receptor in the intact cell without changing the apparent number of receptors on the cell surface; and 2) it induces a redistribution of the high affinity IGF-II receptor between plasma membranes and low density microsomes upon homogenization of cells and preparation of membranes. The latter effect closely parallels the insulin-induced membrane redistribution of the glucose transporter that occurs in the rat adipocyte by an unknown mechanism.

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