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Related Experiment Videos

Human erythrocyte insulin receptor down-regulation is accompanied by a transient decrease in membrane order.

M T Santini1, P L Indovina, J R Simmons

  • 1Laboratorio di Ultrastrutture, Università di Napoli, Rome, Italy.

Biochimica Et Biophysica Acta
|September 24, 1990
PubMed
Summary
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Insulin receptor down-regulation in human red blood cells involves a temporary decrease in cell membrane order. This membrane fluidity change, measured by electron paramagnetic resonance (EPR) spectroscopy, correlates with insulin receptor internalization.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Insulin receptor down-regulation is a key cellular process affecting insulin signaling.
  • Electron paramagnetic resonance (EPR) spectroscopy with spin labels can detect changes in cell membrane dynamics.
  • Human erythrocytes exhibit insulin receptor internalization upon insulin exposure.

Purpose of the Study:

  • To investigate changes in erythrocyte membrane order during insulin-induced receptor down-regulation.
  • To correlate alterations in membrane order with the kinetics of insulin receptor internalization.
  • To explore the role of membrane fluidity in the mechanism of insulin receptor down-regulation.

Main Methods:

  • Utilized electron paramagnetic resonance (EPR) spectroscopy with the spin label 5-nitroxystearate to measure erythrocyte membrane order (2T'II parameter).

Related Experiment Videos

  • Monitored changes in membrane order over 3 hours at 37°C and 23°C.
  • Quantified insulin receptor internalization using surface binding assays.

    • Main Results:

    • A transient decrease in erythrocyte membrane order was observed within 30 minutes of insulin incubation, reaching a minimum at 90 minutes.
    • This decrease in membrane order correlated with a reduction in surface insulin binding, down to 30% of control values within 2 hours.
    • No significant changes in membrane order or receptor internalization occurred with denatured insulin or ATP-depleted erythrocytes.

    Conclusions:

    • An increase in membrane disorder is associated with the mechanism of insulin receptor down-regulation.
    • EPR spectroscopy provides a valuable tool for studying dynamic changes in cell membranes during receptor-mediated processes.
    • These findings support a model where membrane fluidity alterations play a role in regulating insulin receptor trafficking.