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Molecular analysis of membrane gamma 2b heavy chain expression
M C Sneller1, D Y Kunimoto, J F Mushinski
1Mucosal Immunity Section, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892.
Molecular Immunology
|April 1, 1988
Summary
T cells regulate B cell isotype differentiation by inducing specific mRNA, crucial for producing translatable gamma 2b-mRNA and surface IgG2b. This highlights T cell involvement in early B cell development.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- T cell regulation of B cell differentiation is critical for adaptive immunity.
- Understanding B cell isotype switching requires studying T cell-B cell interactions.
- The 70Z/3 murine B cell lymphoma model offers a system to investigate these interactions.
Purpose of the Study:
- To develop a model system for studying T cell regulation of B cell isotype differentiation.
- To investigate the role of T cells in inducing B cell expression of membrane IgG2b.
- To elucidate the molecular mechanisms underlying T cell-mediated B cell isotype switching.
Main Methods:
- Utilized a model system of clonal T and B cells.
- Exposed the murine B cell lymphoma 70Z/3 to a T cell hybridoma (HAJ-3).
- Analyzed gamma 2b-mRNA expression and switch region rearrangements.
Main Results:
- T cell hybridoma HAJ-3 induced membrane IgG2b (mIgG2b) expression in 70Z/3 cells.
- mIgG2b expression correlated with gamma 2b-mRNA induction, without switch region rearrangement or C mu deletion.
- T cell influence was necessary for translatable gamma 2b-specific mRNA, unlike LPS stimulation alone.
- Both LPS and T cell-induced gamma 2b mRNA transcripts lacked VH sequences.
Conclusions:
- T cells are essential for producing translatable gamma 2b-specific mRNA, leading to mIgG2b expression.
- The findings support a two-step model of B cell isotype switching.
- T cells regulate early events in B cell isotype differentiation, influencing mRNA translatability.