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Related Experiment Videos

Interaction between terminal complement proteins C5b-7 and anionic phospholipids.

C Liu1, P Marshall, I Schreibman

  • 1Division of Dermatology, Manhattan Veteran's Administration Medical Center, New York, NY 10010-5050, USA.

Blood
|March 26, 1999
PubMed
Summary
This summary is machine-generated.

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Anionic lipids on red blood cell membranes enhance complement protein C5b-7 uptake and subsequent cell lysis. This finding explains why sickle cell erythrocytes are more sensitive to complement-mediated cell damage.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • The terminal complement pathway involves C5b-6 binding to erythrocyte membranes via sialic acid.
  • Subsequent insertion of C7 and formation of the C5b-9 complex leads to cell lysis.

Purpose of the Study:

  • To investigate the role of anionic lipids in the binding of terminal complement proteins to the erythrocyte membrane.
  • To assess the impact of anionic lipids on the efficiency of complement-mediated hemolysis.

Main Methods:

  • Human erythrocytes were modified with specific lipids: dipalmitoyl phosphatidylcholine (DPPC), dipalmitoyl phosphatidylserine (DPPS), dipalmitoyl phosphatidylethanolamine (DPPE), and dipalmitoyl phosphatidic acid (DPPA).
  • Lipid incorporation and hemolytic assays were performed in the presence of sodium orthovanadate to stabilize lipid distribution.

Related Experiment Videos

  • C5b-7 uptake and C5b-9-mediated hemolysis were quantified.

    • Main Results:

    • Neutral lipids (DPPC, DPPE) did not influence C5b-7 uptake or hemolysis.
    • Acidic phospholipids (DPPS, DPPA) significantly increased C5b-7 uptake and hemolysis in a dose-dependent manner.
    • Sickle cell erythrocytes, known for externalized phosphatidylserine, exhibit increased sensitivity to C5b-9 lysis, consistent with these findings.

    Conclusions:

    • The presence of anionic lipids on the external face of the erythrocyte membrane enhances C5b-7 uptake.
    • This enhanced uptake leads to increased subsequent hemolysis by the C5b-9 complex.
    • Anionic lipid exposure provides a mechanistic explanation for the heightened susceptibility of sickle cell erythrocytes to complement-mediated lysis.