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Biotinylation: a nonradioactive method for the identification of cell surface antigens in immunoprecipitates

B Flesch1, E Ntambi, J Neppert

  • 1Institute of Transfusion Medicine, University of Kiel, Germany.

Electrophoresis
|May 1, 1995
PubMed

Insights

This study introduces a nonradioactive method to detect cell membrane antigens on human immune cells. The N1III10 antibody identifies a 40 kDa antigen on monocytes and platelets, consistent with Fc gamma RII receptors.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Accurate detection of cell membrane antigens is crucial for understanding immune cell function.
  • Existing methods for antigen detection may have limitations.
  • Fc gamma RII receptors play a role in immune responses.

Purpose of the Study:

  • To develop and validate a nonradioactive method for detecting cell membrane antigens.
  • To compare the reactivity of a novel monoclonal antibody (N1III10) with known antibodies.
  • To characterize the antigen recognized by N1III10 on human immune cells.

Main Methods:

  • Utilized a biotinylation technique for labeling intact cells.
  • Employed immunoprecipitation with Protein A-Sepharose to isolate antigens.
  • Analyzed antigen-antibody complexes using SDS-PAGE and Western blotting.
  • Visualized biotinylated antigens via a streptavidin-alkaline phosphatase system.

Main Results:

  • Successfully detected cell membrane antigens on human polymorphonuclear granulocytes, monocytes, and platelets.
  • Demonstrated that the N1III10 monoclonal antibody recognizes a 40 kDa antigen.
  • The identified antigen on monocytes and platelets is comparable to Fc gamma RII receptors.
  • Validated the nonradioactive biotin-labeling system for antigen detection.

Conclusions:

  • The developed nonradioactive method is effective for identifying cell membrane antigens.
  • The N1III10 antibody targets a 40 kDa antigen, likely Fc gamma RII, on monocytes and platelets.
  • This technique offers a sensitive and specific approach for immunological research.

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