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IL-5 responsive subsets among normal and lymphomatous murine B cells
V K Tsiagbe1, M H Nicknam, D Fattah
1Department of Pathology, New York University Medical School, New York 10016.
Insights
Interleukin-5 (IL-5) stimulates normal murine B cells and derived lymphomas, with a comitogen required for normal B-cell proliferation. Interferon-gamma (IFN-γ) inhibits coelomic B-cell growth but not germinal center B cells or their lymphomas.
Area of Science:
- Immunology
- Cell Biology
- Cancer Research
Background:
- Murine B-cell subpopulations, including germinal center (GC) B cells and coelomic (Coel) B cells, play distinct roles in immune responses.
- B-cell lymphomas can arise from these normal B-cell populations, exhibiting altered growth and response characteristics.
- Interleukin-5 (IL-5) is a cytokine known to influence B-cell development and function.
Purpose of the Study:
- To investigate the differential response of normal murine B-cell subpopulations and their derived lymphomas to Interleukin-5 (IL-5).
- To determine the modulatory effect of Interferon-gamma (IFN-γ) on the proliferation of these B-cell subsets and lymphomas.
Main Methods:
- Isolation and culture of normal murine germinal center B cells and coelomic B cells.
- Culture of B-cell lymphomas derived from these subpopulations.
- Stimulation assays using IL-5, with and without a comitogen (DxS) for normal B cells.
- Assessment of cell proliferation in response to IL-5 and IFN-γ.
Main Results:
- Both normal germinal center B cells and coelomic B cells, as well as some derived lymphomas, exhibit responsiveness to IL-5.
- Proliferation of normal B cells in response to IL-5 requires the presence of a comitogen (DxS).
- IFN-γ significantly inhibits the proliferation of coelomic B cells but has no inhibitory effect on germinal center B cells or their associated SJL lymphomas.
Conclusions:
- IL-5 can promote the proliferation of distinct normal murine B-cell subsets and certain B-cell lymphomas.
- The requirement for a comitogen highlights differential activation pathways for normal B cells.
- IFN-γ exhibits subset-specific inhibitory effects on B-cell proliferation, suggesting distinct regulatory mechanisms between germinal center and coelomic B cells and their malignant counterparts.
Abstract:
Two normal murine B-cell subpopulations, germinal center and coelomic B cells, and at least some of the lymphomas derived from them, respond to IL-5. In the case of normal B cells, a comitogen (DxS) is required. IFN-gamma is strongly inhibitory to proliferation of the coelomic B-cell subset but not for germinal center cells or the SJL lymphomas derived from them.