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Published on: April 23, 2010
A rapid staining procedure for two-color analysis of lymphocyte antigen expression
1Institute of Immunology, University of Heidelberg, Germany.
Insights
This study presents a streamlined two-step protocol for two-color immunofluorescence, significantly reducing incubation time for lymphocyte cell surface antigen analysis. The modified method achieves identical results to the traditional four-step procedure.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Two-color immunofluorescence is crucial for analyzing lymphocyte cell surface antigens.
- Traditional methods utilize four incubation steps involving unconjugated and biotinylated monoclonal antibodies (mAbs).
Purpose of the Study:
- To develop a time-saving modification for two-color immunofluorescence analysis.
- To simplify the protocol for lymphocyte cell surface antigen expression studies.
Main Methods:
- A novel two-step incubation protocol was developed.
- This involved simultaneous application of unconjugated and biotinylated mAbs, followed by sequential addition of fluorochrome-labeled avidin/streptavidin and goat anti-mouse Ig.
- A 5-minute delay in goat anti-mouse Ig addition prevents non-specific binding.
Main Results:
- The modified procedure requires only two incubation steps, compared to the conventional four.
- Identical results were obtained using the modified protocol with various monoclonal antibodies.
- The method effectively analyzes lymphocyte cell surface antigen expression.
Conclusions:
- A simplified and efficient two-step protocol for two-color immunofluorescence has been established.
- This modification significantly reduces experimental time without compromising analytical accuracy.
- The protocol is applicable to a range of monoclonal antibodies for antigen expression analysis.
Abstract:
Two color immunofluorescence analysis of lymphocyte cell surface antigen expression using an unconjugated plus a biotinylated monoclonal antibody (mAb) requires four incubation steps: (1) unconjugated mAb; (2) fluorochrome-labelled goat anti-mouse Ig; (3) biotinylated mAb; (4) fluorochrome-labelled avidin or streptavidin. We describe a time-saving modification of this procedure which requires only two incubation steps: (1) simultaneous unconjugated and biotinylated mAbs; (2) fluorochrome-labelled avidin/streptavidin followed by fluorochrome-labelled goat anti-mouse Ig. The slightly delayed (5 min) addition of the goat anti-mouse Ig prevents it from binding to the mAb which has already interacted with avidin/streptavidin. Both procedures yield identical results with a variety of different mAbs.
