Related Experiment Videos
Plaque-forming cells in human cord blood: a soluble factor suppressing differentiation but not proliferation of B
Abstract:
Cord blood-derived T cells have been shown to suppress differentiation of B cells into immunoglobulin-secreting cells and proliferation of mononuclear cells (MNC). We report about a soluble factor present in the supernatant of pokeweed mitogen (PWM)-stimulated cord blood MNC which was able to suppress significantly the number of plaque-forming cells (PFC) in adult MNC populations, but had no effect upon proliferation of adult MNC in response to PWM and allogeneic MNC. The number of PFC was not suppressed by supernatant from unstimulated cord blood MNC or by PWM-stimulated adult MNC.
Insights
A soluble factor from cord blood mononuclear cells (MNC) suppresses immunoglobulin production in adults. This factor, found in pokeweed mitogen-stimulated supernatant, significantly reduced plaque-forming cells (PFC) without affecting T-cell proliferation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Cord blood T cells can inhibit B cell differentiation and mononuclear cell (MNC) proliferation.
- Immunoglobulin production is a key function of differentiated B cells.
Purpose of the Study:
- To investigate a soluble factor in cord blood MNC supernatant that suppresses immunoglobulin secretion.
- To determine if this factor affects adult MNC proliferation.
Main Methods:
- Pokeweed mitogen (PWM) stimulation of cord blood MNC.
- Collection of supernatant from stimulated and unstimulated cord blood MNC.
- Assay of supernatant's effect on adult MNC plaque-forming cell (PFC) numbers and proliferation in response to PWM and allogeneic stimulation.
Main Results:
- Supernatant from PWM-stimulated cord blood MNC significantly suppressed PFC formation in adult MNC.
- The same supernatant did not inhibit adult MNC proliferation stimulated by PWM or allogeneic cells.
- Supernatant from unstimulated cord blood MNC or stimulated adult MNC did not suppress PFC formation.
Conclusions:
- A soluble factor present in stimulated cord blood MNC supernatant possesses immunosuppressive properties, specifically targeting B cell immunoglobulin secretion.
- This factor selectively inhibits B cell differentiation into antibody-secreting cells without impacting T cell proliferation.
- Cord blood may represent a source of soluble factors with potential immunomodulatory applications.