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Related Experiment Videos

Bepridil as an antisickling agent: membrane internalization and cell rigidity

R M Johnson1, C Acquaye, C Féo

  • 1Department of Biochemistry, Wayne State Medical School, Detroit, Michigan 48201.

American Journal of Hematology
|August 1, 1994
PubMed
Summary
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Bepridil, a calcium channel antagonist, prevents sickle cell disease (SCD) erythrocytes from sickling in dilute suspensions by inducing endocytosis and reducing cell deformability. This mechanism, observed in SCD red blood cells, offers insights into SCD treatment strategies.

Area of Science:

  • Hematology
  • Pharmacology
  • Cell Biology

Background:

  • Sickle cell disease (SCD) is characterized by the sickling of erythrocytes under deoxygenated conditions.
  • Identifying agents that inhibit erythrocyte sickling is crucial for SCD therapeutic development.
  • Bepridil is a known calcium channel antagonist with potential effects on red blood cells.

Purpose of the Study:

  • To investigate the anti-sickling effects of bepridil on deoxygenated sickle (SS) erythrocytes.
  • To elucidate the cellular mechanisms underlying bepridil's anti-sickling action.
  • To determine if bepridil affects intracellular hemoglobin S polymerization.

Main Methods:

  • Light microscopy to assess erythrocyte sickling.
  • Ektacytometry (osmotic and oxygen scans) to measure cell surface area, volume, and deformability.

Related Experiment Videos

  • Electronic sizing and transmission electron microscopy to analyze cell morphology and endocytosis.

    • Main Results:

    • Bepridil inhibited sickling in dilute SS erythrocyte suspensions but not in concentrated ones.
    • Bepridil induced a rapid increase in red cell surface area followed by a loss via endocytosis, reducing deformability.
    • Bepridil did not inhibit intracellular hemoglobin S polymerization, even at high concentrations.

    Conclusions:

    • Bepridil inhibits sickle cell sickling by inducing endocytosis and decreasing red blood cell deformability, not by affecting hemoglobin polymerization.
    • This mechanism of action, involving endocytosis and reduced deformability, may be shared by other basic amphiphilic drugs.
    • Bepridil's effect is concentration-dependent and specific to dilute erythrocyte suspensions.