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Quantitative comparison of K cell potential in human T and null cells
European Journal of Immunology
|November 1, 1978
Summary
This study quantifies antibody-dependent cell-mediated cytotoxicity (ADCC) by human lymphocytes. Null cells and T cells contribute significantly to ADCC, with Fc receptor-bearing T cells playing a key role.
Area of Science:
- Immunology
- Cellular Biology
Background:
- Antibody-dependent cell-mediated cytotoxicity (ADCC) is a crucial immune mechanism.
- Understanding the specific lymphocyte populations involved in ADCC is essential for immune response research.
Purpose of the Study:
- To quantify the relative contributions of different human lymphocyte subsets to ADCC.
- To investigate the role of Fc receptor-bearing cells in ADCC.
Main Methods:
- Quantitative ADCC assay using 51Cr-labeled mouse lymphoma cells.
- Lymphocyte separation via anti-F(ab')2 columns, E and EA rosette sedimentation, and albumin gradients.
- Characterization of lymphocyte subsets using surface markers.
Main Results:
- Null cells exhibited the highest cytotoxic capacity per cell.
- Highly purified T cells also showed significant cytotoxic capacity, comparable to null cells due to their numerical abundance.
- ADCC was completely abolished upon removal of Fc receptor-bearing cells across all subsets.
Conclusions:
- Both null cells and T cells are major contributors to human lymphocyte ADCC.
- Fc receptor-bearing T cells, despite their small proportion, play a significant role in ADCC.
- Fc receptor expression is critical for ADCC activity in all studied lymphocyte subsets.