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pubmed-article:7534700pubmed:abstractTextThe effects of insulin to stimulate metabolic and mitogenic responses were examined in Rat 1 fibroblast cells that overexpressed either normal (HIRc) or kinase-deficient human insulin receptors. When studied at the optimal growth stage for each cell line, insulin-stimulated responses measured in cells containing kinase-defective receptors with a Lys1018-Ala1018 substitution in the ATP-binding site of the kinase domain (A/K1018). Maximal insulin responsiveness for all these effects, measured as fold-increase over basal, was comparable in parental and HIRc cells (1.8- to 2.4-fold increases). Relative insulin responsiveness for all effects was greatest in A/K 1018 cells. One clone (AK-I) expressing a similar number of kinase-inactive receptors as in the HIRc cells displayed maximal responsiveness of 3.6- to 5.5-fold increases. A second A/K cell line containing 1/10 the number of kinase-inactive receptors displayed responsiveness intermediate between AK-I and parental or HIRc cells (1.5- to 4.8-fold increases). Both clones of kinase-deficient A/K1018 cells displayed impaired insulin sensitivity compared with HIRc cells. These findings suggest that expression of insulin receptor kinase activity is a determinant of insulin sensitivity but not necessarily of the final biological responsiveness of cells to insulin.lld:pubmed
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pubmed-article:7534700pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:7534700pubmed:articleTitleRat fibroblast cells overexpressing kinase-inactive human insulin receptors are insulin responsive: influence of growth conditions.lld:pubmed
pubmed-article:7534700pubmed:affiliationDepartment of Biochemistry, National University of Singapore, Kent Ridge.lld:pubmed
pubmed-article:7534700pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7534700pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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