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Evidence that FMC7 is a human B cell differentiation antigen
G T Rijkers1, I Dollekamp, B J Zegers
1Department of Immunology, University Hospital for Children and Youth, Het Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands.
Immunology Letters
|July 1, 1990
Summary
FMC7 antigen expression initially increases on B cells after tetanus toxoid immunization. However, antibody-secreting B cells lose FMC7, indicating its role in B cell activation and differentiation.
Area of Science:
- Immunology
- Cell Biology
Background:
- FMC7 is a B cell restricted antigen found on approximately 50% of adult peripheral blood B cells.
- B cell activation and differentiation are critical processes in adaptive immunity.
Purpose of the Study:
- To investigate the expression dynamics of the FMC7 antigen on B cells during an immune response in vivo.
- To determine the relationship between FMC7 expression and antibody secretion.
Main Methods:
- Peripheral blood B cells were analyzed following booster immunization with tetanus toxoid.
- Flow cytometry was used to assess FMC7 expression density on B cell populations.
- Antibody-secreting cells (IgM and IgG) were identified and characterized based on FMC7 expression.
Main Results:
- A small population of B cell blasts with increased FMC7 density was observed 7-10 days post-immunization.
- The majority of anti-tetanus toxoid antibody-secreting cells were found within the FMC7-negative B cell population.
- These findings suggest an initial increase in FMC7 expression upon B cell activation.
Conclusions:
- FMC7 expression transiently increases on B cells during the initial phase of in vivo activation.
- FMC7 determinant is lost on B cells that have differentiated into antibody-secreting plasma cells.
- FMC7 may serve as a marker for B cell activation stages, preceding terminal differentiation into antibody secretion.