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Related Experiment Videos

Decrease of red cell membrane fluidity and -SH groups due to hyperglycemic conditions is counteracted by alpha-lipoic

M Hofmann1, P Mainka, H Tritschler

  • 1Gustav-Embden-Zentrum der Biologischen Chemie, Universitätsklinikum Frankfurt, Frankfurt am Main, Germany.

Archives of Biochemistry and Biophysics
|December 1, 1995
PubMed
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High glucose levels decrease red blood cell membrane fluidity and protein -SH reactivity. Alpha-lipoic acid, particularly the S-form, can restore these parameters, suggesting a role in managing diabetic conditions.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Hyperglycemia, a hallmark of diabetes, can induce detrimental changes in red blood cell membranes.
  • Membrane fluidity and protein sulfhydryl (-SH) group reactivity are critical for red blood cell function.
  • Understanding how glucose concentrations affect these parameters is crucial for metabolic disease research.

Purpose of the Study:

  • To investigate the impact of varying D-glucose concentrations on human red blood cell membrane fluidity and protein -SH reactivity.
  • To evaluate the efficacy of alpha-lipoic acid and other compounds in counteracting glucose-induced membrane alterations.
  • To elucidate the role of the glucose transporter protein 1 (GluT1) in these observed effects.

Main Methods:

  • Incubation of human red blood cell membranes (ghosts) with D-glucose at different concentrations (fasting, hypo-, and hyperglycemic).

Related Experiment Videos

  • Measurement of membrane fluidity using diphenylhexatriene and protein -SH group reactivity with Ellman's reagent.
  • Assessment of alpha-lipoic acid (R- and S-forms), dithiothreitol, and 2-mercaptopropionylglycine effects.
  • Studies on isolated, reconstituted membrane proteins and erythrocyte glucose carrier.

    • Main Results:

    • D-glucose concentrations above 10 mM significantly decreased red blood cell membrane fluidity and protein -SH reactivity.
    • Alpha-lipoic acid (especially the S-form) effectively increased membrane fluidity and -SH groups at elevated glucose levels.
    • Other sugars (L-glucose, D-fructose, sucrose) did not induce comparable changes, highlighting D-glucose specificity.
    • Dithiothreitol reduced -SH groups without restoring fluidity, while 2-mercaptopropionylglycine only restored -SH groups.
    • The glucose transporter protein 1 (GluT1) appears to be involved in mediating these glucose-dependent membrane alterations.

    Conclusions:

    • Hyperglycemic conditions negatively impact red blood cell membrane biophysical properties.
    • Alpha-lipoic acid demonstrates potential therapeutic value in mitigating glucose-induced red blood cell membrane damage.
    • The glucose transporter GluT1 plays a significant role in the observed effects of D-glucose on erythrocyte membranes.