Linked Life Data

3528154

Source:http://linkedlifedata.com/resource/pubmed/id/3528154

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pubmed-article:3528154pubmed:abstractTextInsulin stimulates hexose transport and phosphorylation of the insulin receptor in monolayer cultures of intact 3T3-L1 adipocytes. To assess the phosphorylation state of the receptor in situ, cells were equilibrated with [32P]orthophosphate and then disrupted under denaturing conditions which preserved the phosphorylation state of the receptor established in the cell. The insulin receptor, isolated by lectin adsorption and two-dimensional nonreducing/reducing polyacrylamide gel electrophoresis, occurred as a single oligomeric species with an apparent alpha 2 beta 2 subunit composition. This oligomeric structure was not altered by treating cells with insulin. Only the beta-subunit of the receptor was phosphorylated; [32P]phosphoserine and [32P] phosphotyrosine were both identified in the beta-subunit from cells in the unstimulated state, but only [32P] phosphotyrosine increased in cells stimulated with insulin. Neither insulin-like growth factors I nor II stimulated insulin receptor beta-subunit phosphorylation, although both activated hexose transport. Upon the addition of insulin, [32P]orthophosphate incorporated into the beta-subunit increased 4.5-fold (7-fold with respect to [32P]tyrosine) and was complete within 1 min (t1/2 = 8 s). Following the removal of insulin from the monolayers, [32P]beta-subunit fell to the basal level (t1/2 = 2.5 min); there was no lag phase before either transition. The tyrosine protein kinase activity, measured in vitro with a model substrate, was higher with immunoaffinity-purified insulin receptor from insulin-stimulated cells than from cells in the basal state. Hexose transport rate, measured using 3-O-[methyl-14C]glucose, was half-maximally stimulated at 2 nM insulin. A 1-min latency period followed insulin addition, after which a 7-fold increase in the steady-state rate of hexose uptake was achieved within 5 min. Upon the removal of insulin, hexose transport continued at the stimulated steady-state rate for 2.5 min and then declined to the basal rate with a half-time of 8 min. These kinetic experiments in situ and protein kinase activity measurements in vitro support the hypothesis that beta-subunit phosphorylation is an intermediate step linking insulin binding to the increased glucose transport rate.lld:pubmed
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pubmed-article:3528154pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:3528154pubmed:articleTitleInsulin-dependent phosphorylation of the insulin receptor-protein kinase and activation of glucose transport in 3T3-L1 adipocytes.lld:pubmed
pubmed-article:3528154pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:3528154pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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