Time course of termination of the glucose transport action of insulin in adipocytes

O B Crofford
1975 Journal of Biological Chemistry  
Rapid sequence measures of changes in the rate of 14CO2 production from [14C]glucose bathing the cells was abruptly reduced from 20 to 4 microunits/ml. Interpretation of the data in terms of glucose transport was based on calibration experiments that described the time course of change in 14CO2 production when [14C]glucose entry into adipocytes was slowed by reducing the specific activity of [14C]glucose in the incubation medium. All experiments were performed at 37 degrees in Krebs-Ringer
more » ... bonate buffer at pH 7.4. Termination of the glucose transport action of insulin (which includes insulin-receptor disassociation and all other steps leading to decelerated glucose entry) began within 2 min and was complete within 30 min. The transition from one steady state rate of glucose transport to the other could be approximated by an exponential process occurring with a half-time of 14 min. For comparison, the time course of initiation of the glucose transport action of insulin was measured under the same conditions. The transition curve was virtually identical.
pmid:1165235 fatcat:edczvtxgv5gbrgtfih77gnyqeq