Related Experiment Videos
Macrophage-T cell interactions in the Con A induction of human suppressive T cells
Abstract:
Macrophage-T interactions are required for the Con A-induced generation of human Ts capable of inhibiting PHA-induced blastogenesis among autologous PBMC. Con A treatment of adherent cell-depleted PBMC, or PBMC recovered after a 7-day incubation in FCS, failed to generate Ts. Addition of adherent cells to either of these populations restored Con A inducible Ts. Discontinuous density gradient fractionation of adherent cells demonstrated that the required accessory cell was a low density macrophage bearing the human equivalent of murine Ia.
Insights
Macrophage-T cell interactions are crucial for generating human T-suppressor cells (Ts) that inhibit PBMC blastogenesis. Low-density macrophages expressing Ia molecules are essential accessory cells for this process.
Area of Science:
- Immunology
- Cell Biology
Background:
- T-cell activation and function are critical in immune responses.
- Understanding accessory cell requirements for T-cell differentiation is important.
Purpose of the Study:
- To investigate the role of accessory cells in Concanavalin A (Con A)-induced T-suppressor (Ts) cell generation.
- To identify the specific accessory cell type involved in Ts cell induction.
Main Methods:
- Peripheral blood mononuclear cells (PBMC) were treated with Con A.
- Adherent cells were depleted or removed after incubation.
- Accessory cells were fractionated using discontinuous density gradient centrifugation.
Main Results:
- Con A treatment of PBMC depleted of adherent cells or aged PBMC failed to generate Ts cells.
- Addition of adherent cells restored Con A-inducible Ts cell generation.
- Low-density macrophages expressing the human equivalent of murine Ia were identified as the key accessory cells.
Conclusions:
- Macrophage-T cell interactions are essential for Con A-induced human Ts cell generation.
- Low-density macrophages expressing Ia molecules play a critical accessory role in Ts cell induction.