A possible mechanism of insulin resistance in the rat adipose cell with high-fat/low-carbohydrate feeding. Depletion of intracellular glucose transport systems

P. J. Hissin, E. Karnieli, Ian Simpson, L. B. Salans, S. W. Cushman

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The effects of high-fat/low-carbohydrate feeding on glucose transport activity and on the concentrations of glucose transport systems in the plasma and low-density microsomal membranes in isolated rat adipose cells have been examined. Glucose transport activity was assessed by measuring 3-O-methylglucose transport and the concentration of glucose transport systems estimated by measuring specific D-glucose-inhibitable cytochalasin B-binding. Basal glucose transport activity is not significantly influenced by high-fat/low-carbohydrate relative to low-fat/high-carbohydrate feeding and is accompanied by a constant 10 pmol of glucose transport systems/mg of membrane protein in the plasma membrane fraction. In contrast, maximally insulin-stimulated glucose transport activity decreases from 4.72 to 2.29 fmol/min and is accompanied by a decrease from 44 to 26 pmol of glucose transport systems/mg of plasma membrane protein. These diminished effects of insulin on glucose transport activity and the concentration of glucose transport systems in the plasma membrane fraction are paralleled by a 48% decrease in the basal number of glucose transport systems/mg of membrane protein in the low-density microsomal membrane fraction, the source of those glucose transport systems appearing in the plasma membrane in response to insulin. Thus, the 'insulin-resistant' glucose transport of the adipose cell with high-fat/low-carbohydrate feeding may be the consequence of a depletion of glucose transport systems in the intracellular pool.

Original languageEnglish (US)
Pages (from-to)589-592
Number of pages4
JournalUnknown Journal
Volume31
Issue number7
DOIs
StatePublished - Jan 1 1982

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

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