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Expression of functional MHC class II molecules by a mouse pro-B cell clone
S Lombard-Platet1, A G Fisher, V Meyer
1Laboratoire de Génétique Moléculaire des Eucaryotes du CNRS et Unité 184 de I'INSERM, Institut de Chimie Biologique, Strasbourg, France.
Developmental Immunology
|January 1, 1995
Summary
This study introduces the G12 pro-B cell clone, demonstrating its capacity to process and present antigens. This finding marks the first instance of a pro-B cell functioning as an antigen-presenting cell (APC) in MHC class II-restricted presentation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Pro-B cells are immature B lymphocytes crucial for initiating adaptive immune responses.
- Antigen-presenting cells (APCs) play a vital role in T cell activation and immune regulation.
- MHC class II molecules are essential for presenting extracellular antigens to CD4+ T cells.
Purpose of the Study:
- To characterize a novel pro-B cell clone (G12) derived from an IL-7 transgenic mouse.
- To investigate the antigen-presenting capabilities of this pro-B cell clone in an MHC class II-restricted context.
Main Methods:
- Isolation and characterization of the G12 pro-B cell clone.
- Flow cytometry analysis to determine cell surface marker expression (B220, BP-1, HSA, CD43, lambda5, CD25).
- Assessment of antigen processing and presentation using Hen Egg Lysozyme (HEL) and an MHC class II-restricted T-cell hybridoma.
Main Results:
- The G12 clone exhibits a pro-B cell phenotype (B220+, BP-1+, HSA+, CD43+, lambda5+, CD25-).
- G12 cells express cell-surface MHC class II molecules, albeit at lower levels than mature B cells.
- G12 cells can process and present HEL to T cells, confirming their function as APCs.
Conclusions:
- This study reports the first evidence of a pro-B cell acting as an APC in MHC class II-restricted antigen presentation.
- The G12 clone provides a valuable model for studying early B cell development and antigen presentation mechanisms.