Insulin-induced subcellular redistribution of insulin-like growth factor II receptors in the rat adipose cell. Counterregulatory effects of isoproterenol, adenosine, and cAMP analogues

P. Lonnroth, K. C. Appell, C. Wesslau, S. W. Cushman, Ian Simpson, U. Smith

Research output: Contribution to journalArticle

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Abstract

Insulin shifts the steady-state subcellular distribution of insulin-like growth factor II (IGF-II) receptors from a large intracellular pool to the plasma membrane in the rat adipose cell (Wardzala, L.J., Simpson, I.A., Rechler, M.M., and Cushman, S.W. (1984) J. Biol. Chem. 259, 8378-8383). In the present study, the counterregulatory effects of adrenergic stimulation, adenosine deaminase, and cAMP on this process were studied. Both isoproterenol (10-6 M) and adenosine deaminase reduced insulin sensitivity and also rapidly (T( 1/2 ) ~1.5 min) decreased the effect of a maximal insulin concentration on the number of cell surface IGF-II receptors by 35-50%, and by 70% when added together. The marked reduction in binding was retained in isolated and solubilized plasma membranes. Both isoproterenol and adenosine deaminase alone increased the EC50 for insulin from 0.06 to 0.17 nM and, when combined, to 0.6 nM. N6-Monobutyryl-cAMP and 8-bromo-cAMP were equally potent in reducing IGF-II binding in the absence of insulin and inhibited maximal insulin-stimulated IGF-II binding by 60 and 30%, respectively. However, only the nonhydrolyzable cAMP analogue, N6-monobutyryl-cAMP, reduced the insulin sensitivity (EC50 0.7nM). An important stimulatory role for G(i) (guanine nucleotide-binding regulatory protein that inhibits adenylate cyclase) was indicated by the altered activities of cells from pertussis toxin-treated animals. The results suggest that β-adrenergic stimulation through a cAMP-dependent mechanism markedly alters the insulin-stimulated redistribution of IGF-II receptors. This effect is additional to the potent antagonistic action of cAMP on insulin's signalling mechanism.

Original languageEnglish (US)
Pages (from-to)15386-15391
Number of pages6
JournalJournal of Biological Chemistry
Volume263
Issue number30
StatePublished - Jan 1 1988

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IGF Type 2 Receptor
Isoproterenol
Adenosine
Rats
Insulin
Adenosine Deaminase
Insulin-Like Growth Factor II
Adrenergic Agents
Insulin Resistance
Cell membranes
Cell Membrane
8-Bromo Cyclic Adenosine Monophosphate
Pertussis Toxin
GTP-Binding Proteins
Adenylyl Cyclases
Guanine Nucleotides
Carrier Proteins
Cell Count
Animals
Cells

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

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title = "Insulin-induced subcellular redistribution of insulin-like growth factor II receptors in the rat adipose cell. Counterregulatory effects of isoproterenol, adenosine, and cAMP analogues",
abstract = "Insulin shifts the steady-state subcellular distribution of insulin-like growth factor II (IGF-II) receptors from a large intracellular pool to the plasma membrane in the rat adipose cell (Wardzala, L.J., Simpson, I.A., Rechler, M.M., and Cushman, S.W. (1984) J. Biol. Chem. 259, 8378-8383). In the present study, the counterregulatory effects of adrenergic stimulation, adenosine deaminase, and cAMP on this process were studied. Both isoproterenol (10-6 M) and adenosine deaminase reduced insulin sensitivity and also rapidly (T( 1/2 ) ~1.5 min) decreased the effect of a maximal insulin concentration on the number of cell surface IGF-II receptors by 35-50{\%}, and by 70{\%} when added together. The marked reduction in binding was retained in isolated and solubilized plasma membranes. Both isoproterenol and adenosine deaminase alone increased the EC50 for insulin from 0.06 to 0.17 nM and, when combined, to 0.6 nM. N6-Monobutyryl-cAMP and 8-bromo-cAMP were equally potent in reducing IGF-II binding in the absence of insulin and inhibited maximal insulin-stimulated IGF-II binding by 60 and 30{\%}, respectively. However, only the nonhydrolyzable cAMP analogue, N6-monobutyryl-cAMP, reduced the insulin sensitivity (EC50 0.7nM). An important stimulatory role for G(i) (guanine nucleotide-binding regulatory protein that inhibits adenylate cyclase) was indicated by the altered activities of cells from pertussis toxin-treated animals. The results suggest that β-adrenergic stimulation through a cAMP-dependent mechanism markedly alters the insulin-stimulated redistribution of IGF-II receptors. This effect is additional to the potent antagonistic action of cAMP on insulin's signalling mechanism.",
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Insulin-induced subcellular redistribution of insulin-like growth factor II receptors in the rat adipose cell. Counterregulatory effects of isoproterenol, adenosine, and cAMP analogues. / Lonnroth, P.; Appell, K. C.; Wesslau, C.; Cushman, S. W.; Simpson, Ian; Smith, U.

In: Journal of Biological Chemistry, Vol. 263, No. 30, 01.01.1988, p. 15386-15391.

Research output: Contribution to journalArticle

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N2 - Insulin shifts the steady-state subcellular distribution of insulin-like growth factor II (IGF-II) receptors from a large intracellular pool to the plasma membrane in the rat adipose cell (Wardzala, L.J., Simpson, I.A., Rechler, M.M., and Cushman, S.W. (1984) J. Biol. Chem. 259, 8378-8383). In the present study, the counterregulatory effects of adrenergic stimulation, adenosine deaminase, and cAMP on this process were studied. Both isoproterenol (10-6 M) and adenosine deaminase reduced insulin sensitivity and also rapidly (T( 1/2 ) ~1.5 min) decreased the effect of a maximal insulin concentration on the number of cell surface IGF-II receptors by 35-50%, and by 70% when added together. The marked reduction in binding was retained in isolated and solubilized plasma membranes. Both isoproterenol and adenosine deaminase alone increased the EC50 for insulin from 0.06 to 0.17 nM and, when combined, to 0.6 nM. N6-Monobutyryl-cAMP and 8-bromo-cAMP were equally potent in reducing IGF-II binding in the absence of insulin and inhibited maximal insulin-stimulated IGF-II binding by 60 and 30%, respectively. However, only the nonhydrolyzable cAMP analogue, N6-monobutyryl-cAMP, reduced the insulin sensitivity (EC50 0.7nM). An important stimulatory role for G(i) (guanine nucleotide-binding regulatory protein that inhibits adenylate cyclase) was indicated by the altered activities of cells from pertussis toxin-treated animals. The results suggest that β-adrenergic stimulation through a cAMP-dependent mechanism markedly alters the insulin-stimulated redistribution of IGF-II receptors. This effect is additional to the potent antagonistic action of cAMP on insulin's signalling mechanism.

AB - Insulin shifts the steady-state subcellular distribution of insulin-like growth factor II (IGF-II) receptors from a large intracellular pool to the plasma membrane in the rat adipose cell (Wardzala, L.J., Simpson, I.A., Rechler, M.M., and Cushman, S.W. (1984) J. Biol. Chem. 259, 8378-8383). In the present study, the counterregulatory effects of adrenergic stimulation, adenosine deaminase, and cAMP on this process were studied. Both isoproterenol (10-6 M) and adenosine deaminase reduced insulin sensitivity and also rapidly (T( 1/2 ) ~1.5 min) decreased the effect of a maximal insulin concentration on the number of cell surface IGF-II receptors by 35-50%, and by 70% when added together. The marked reduction in binding was retained in isolated and solubilized plasma membranes. Both isoproterenol and adenosine deaminase alone increased the EC50 for insulin from 0.06 to 0.17 nM and, when combined, to 0.6 nM. N6-Monobutyryl-cAMP and 8-bromo-cAMP were equally potent in reducing IGF-II binding in the absence of insulin and inhibited maximal insulin-stimulated IGF-II binding by 60 and 30%, respectively. However, only the nonhydrolyzable cAMP analogue, N6-monobutyryl-cAMP, reduced the insulin sensitivity (EC50 0.7nM). An important stimulatory role for G(i) (guanine nucleotide-binding regulatory protein that inhibits adenylate cyclase) was indicated by the altered activities of cells from pertussis toxin-treated animals. The results suggest that β-adrenergic stimulation through a cAMP-dependent mechanism markedly alters the insulin-stimulated redistribution of IGF-II receptors. This effect is additional to the potent antagonistic action of cAMP on insulin's signalling mechanism.

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