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A delayed-type hypersensitivity reaction initiated by a single T lymphocyte
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|December 1, 1981
Summary
A single T cell can initiate a delayed-type hypersensitivity (DTH) reaction. This study used limiting dilutions of T cells to show one cell is sufficient for a DTH response.
Area of Science:
- Immunology
- Cellular immunology
Background:
- Delayed-type hypersensitivity (DTH) is a critical immune response mediated by T cells.
- Understanding the cellular basis of DTH is crucial for immune system research.
Purpose of the Study:
- To determine the minimum number of T cells required to elicit a DTH reaction.
- To investigate whether a single T cell can initiate a DTH response.
Main Methods:
- In vivo adoptive transfer of serially diluted primed T cells into naïve recipients.
- Induction of DTH reaction upon challenge with specific antigen.
- Analysis of footpad swelling using limiting dilution assays.
- Utilizing cloned T cells for precise cellular quantification.
Main Results:
- Footpad swelling measurements after T cell transfer exhibited a distinct bimodal distribution.
- The bimodal distribution indicated a clear separation between positive and negative DTH responses.
- Limiting dilution experiments with cloned T cells confirmed that a single cell can transfer a specific DTH reaction.
Conclusions:
- A single T cell is sufficient to initiate a specific delayed-type hypersensitivity reaction.
- This finding clarifies the cellular stoichiometry of DTH responses.
- The study provides a foundational understanding of T cell-mediated immunity in DTH.