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Characterization of antigen-specific B cells using nominal antigen-coated flow-beads
Nicolas Degauque1, Annie Elong Ngono, Annie Elong Ngono1
1INSERM, UMR 1064, Nantes, France ; CHU de Nantes, ITUN, Nantes, France ; Université de Nantes, Faculté de Médecine, Nantes, France.
Plos One
|January 4, 2014
Summary
A new method uses antigen-coated beads to detect antigen-specific B cells in blood. This tool can identify B cells recognizing self, viral, or vaccine antigens, aiding disease research.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- Characterizing B cell reactivity to specific antigens is crucial for understanding immune responses.
- Existing methods may lack the sensitivity or specificity needed for comprehensive B cell analysis.
- Antigen-specific B cells play key roles in various physiological and pathological processes.
Purpose of the Study:
- To develop and validate a novel method for detecting and quantifying antigen-specific B cells.
- To characterize the reactivity of B cells against a diverse range of antigens, including self, viral, and vaccine antigens.
- To assess the potential clinical applications of this method in identifying B cell responses in different medical conditions.
Main Methods:
- Coupling of various antigens (MOG, albumin, pp65, Tetanic Toxin, EBNA1, HLA) onto fluorescent polystyrene beads.
- Incubation of antigen-coated beads with B cells isolated from human blood (healthy volunteers, immunized individuals, patients).
- Flow cytometry analysis to detect and quantify antigen-binding B cells, including subset analysis (CD19, CD27, IgD).
Main Results:
- Murine B cells with MOG-specific B cell receptors (BCR) specifically recognized MOG-coated beads.
- A significant population of B cells binding to self-antigen MOG-coated beads was detected in normal blood.
- Increased frequencies of B cells recognizing Tetanic Toxin or EBNA1 were observed in previously immunized individuals.
- Elevated frequencies of anti-HLA committed B cells were found in patients with circulating anti-HLA antibodies, predominantly within the naive (CD27(-)IgD(+)) subset.
Conclusions:
- A robust method for detecting and characterizing antigen-specific B cells using antigen-coated beads has been established.
- This method allows for the identification of B cell responses to a wide array of antigens, including self-antigens and those relevant to infections and autoimmunity.
- The findings highlight the potential of this tool for diagnosing and monitoring various medical conditions involving B cell-mediated immunity, such as autoimmune diseases and vaccine responses.
