Related Experiment Videos
Minimal molecular requirements for reactivity of tumor cells with T cells
Abstract:
We have investigated the minimal molecular requirements for T cell recognition of a previously described myeloma tumor (MOPC-315-EL), which reversibly alters its reactivity with T cells. Enucleation of MOPC-315 cells, either sensitive or resistant to reaction with T cells, did not alter the ability of the resulting cytoplasts to elicit or serve as targets for anti-H-2 or anti-Sendai viral cytotoxic T lymphocytes (CTL), despite the fact that there were no detectable differences in serologically defined H-2 or viral antigens on their surface. Likewise, when plasma membranes isolated from sensitive or resistant cells were tested for their ability to elicit anti-H-2 CTL, they retained the phenotype of the cells from which they were isolated. However, solubilized and partially purified H-2 antigens from both sensitive and resistant cells were able to elicit H-2-restricted anti-Sendai virus CTL when incorporated into liposomes with purified viral glycoproteins, and anti-H-2 CTL when incorporated alone into liposomes. These results suggest that a cellular surface component(s) exists that is probably not an H-2K or H-2D gene product and is responsible for the reversible variation in the reactivity of the tumor cells with T cells.
Insights
Tumor cells exhibit reversible changes in T cell recognition, independent of H-2 or viral antigens. A non-H-2 surface component likely mediates this variable T cell interaction.
Area of Science:
- Immunology
- Cell Biology
- Cancer Research
Background:
- Myeloma tumor cells (MOPC-315-EL) display variable reactivity with T cells.
- Understanding the molecular basis of this T cell recognition is crucial for immunotherapy.
Purpose of the Study:
- To identify the minimal molecular requirements for T cell recognition of MOPC-315-EL myeloma cells.
- To investigate the role of cell surface components in reversible T cell interaction.
Main Methods:
- Enucleation of myeloma cells to create cytoplasts.
- Isolation and testing of plasma membranes.
- Solubilization and purification of H-2 antigens.
- Liposome reconstitution assays with H-2 antigens and viral glycoproteins.
- Cytotoxic T lymphocyte (CTL) assays for H-2 and viral antigen recognition.
Main Results:
- Cytoplasts and isolated plasma membranes retained the original cell's reactivity phenotype.
- No detectable differences in H-2 or viral antigens were found between sensitive and resistant cells.
- Solubilized H-2 antigens elicited H-2-restricted CTL responses when reconstituted into liposomes.
Conclusions:
- A cell surface component, likely not an H-2K or H-2D gene product, mediates reversible T cell recognition.
- This unidentified component is responsible for the variable interaction between myeloma cells and T cells.