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The protein composition of red cell eluates
U J Dumaswala1, H Sukati, T J Greenwalt
1Hoxworth Blood Center, University of Cincinnati Medical Center, Ohio.
Transfusion
|January 1, 1995
Summary
Red blood cell (RBC) eluates contain minimal IgG, with protein composition varying by elution method. Xylene eluates had higher protein concentrations than acid eluates.
Area of Science:
- Transfusion Medicine
- Immunology
- Biochemistry
Background:
- Red blood cell (RBC) eluate protein composition is not well-characterized.
- Understanding eluate composition is crucial for immunohematology.
Purpose of the Study:
- To determine the IgG content and protein profile of RBC eluates.
- To compare eluates prepared using acid versus xylene elution methods.
Main Methods:
- Analyzed RBC eluates from in vitro sensitized cells, non-sensitized cells, and patients with warm autoimmune hemolytic anemia (WAIHA).
- Utilized sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for protein separation.
- Employed immunoblot techniques with horseradish peroxidase-conjugated anti-IgG for immunoglobulin quantification.
Main Results:
- Xylene eluates exhibited significantly higher total protein concentrations compared to acid eluates.
- Immunoglobulin G (IgG) constituted less than 0.13% of the total protein in all eluates.
- Acid eluates from sensitized RBCs showed higher IgG content than xylene eluates.
- Antibody titers were lower in eluates from WAIHA patients than from in vitro sensitized RBCs.
- SDS-PAGE revealed distinct protein band patterns between xylene and acid eluates, with no detectable glycoprotein bands.
Conclusions:
- IgG is a minor protein component in RBC eluates.
- The choice of elution method significantly impacts the protein composition of RBC eluates.