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Updated: Jul 16, 2026
Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
Published on: April 16, 2015
TNF-α is a master regulator of drug-specific T-cell activation
Joshua Gardner1, Lichen Li2, Lonnie MacDonald1
1Department of Pharmacology and Therapeutics, Centre for Drug Safety Science, University of Liverpool, Liverpool, United Kingdom.
Background:
The activation of T lymphocytes is implicated in delayed-onset drug hypersensitivity. However, currently defined cellular and genetic risk factors are not sufficient for the development of comprehensive predictive tools, translatable across conventional drug classes, new modalities, and diverse reaction phenotypes.
Objective:
We sought to assess the frequency of interactions between drugs, HLA proteins, and T-cell receptors within human populations and the role of TNF-α as a critical regulator.
Methods:
To study the frequency and functionality of T-cell responses, a novel in vitro culture system was used to mimic the inflammatory microenvironment, achieved through 6-day culture of PBMCs from drug-naive and drug-tolerant individuals with a panel of drugs(metabolites) commonly associated with hypersensitivity, and TNF-α. T-cell proliferation was measured through [3H]-thymidine incorporation, and cytokine analysis was performed using the ELISpot assay.
Results:
T-cell responses to antibiotics were frequently detectable in drug-tolerant and drug-naive individuals following the addition of TNF-α. Ninety percent and 60% of drug-naive individuals produced detectable T-cell responses to vancomycin and piperacillin, respectively. Similarly, T-cell responses to dapsone, sulfamethoxazole, and/or reactive nitroso metabolites were present at high frequencies (>65%). Drug immunogenicity was inhibited by the introduction of TNF-α antagonists and HLA-blocking antibodies. Assays performed using PBMC components (CD3+, CD4+, CD8+, CD45RO+, and CD45RA+) show that drugs readily prime and activate naive T cells, with CD4+CD45RA+ T cells preferentially activated.
Conclusions:
We challenge the central dogma that tolerant individuals do not express the correct immunologic receptors to mount a drug-specific T-cell response and that the cellular machinery for response elicitation is not limited to hypersensitive patients.
Insights
Drug hypersensitivity involves T-lymphocyte activation. This study reveals that even drug-tolerant individuals can mount T-cell responses, challenging previous assumptions and highlighting TNFα
Area of Science:
- Immunology
- Pharmacology
- Drug Hypersensitivity
Background:
- T-lymphocyte activation is key in delayed-onset drug hypersensitivity.
- Existing predictive tools for drug hypersensitivity are insufficient due to limited understanding of cellular and genetic risk factors.
- Predictive tools need to be translatable across various drug classes, new therapeutic modalities, and diverse reaction phenotypes.
Purpose of the Study:
- To investigate the frequency of interactions between drugs, HLA proteins, and T-cell receptors in human populations.
- To determine the role of TNFα as a critical regulator in drug hypersensitivity.
- To challenge the dogma that only hypersensitive patients mount drug-specific T-cell responses.
Main Methods:
- A novel in vitro culture system was used to simulate the inflammatory microenvironment.
- Peripheral blood mononuclear cells (PBMC) from drug-naïve and drug-tolerant individuals were cultured with common hypersensitivity-associated drugs/metabolites and TNFα.
- T-cell proliferation was assessed via [3H]-thymidine incorporation, and cytokine analysis was performed using ELISpot assays.
Main Results:
- T-cell responses to antibiotics were frequently detected in both drug-tolerant and drug-naïve individuals upon TNFα addition.
- High frequencies of T-cell responses were observed for vancomycin (90%), piperacillin (60%), dapsone, and sulfamethoxazole (>65%) in drug-naïve individuals.
- TNFα antagonists and HLA blocking antibodies inhibited drug immunogenicity, with CD4+CD45RA+ T-cells preferentially activated.
Conclusions:
- The study challenges the established belief that tolerant individuals lack the necessary immunological receptors for drug-specific T-cell responses.
- The cellular mechanisms for eliciting T-cell responses to drugs are not exclusive to hypersensitive patients.
- These findings suggest a broader potential for T-cell activation in drug response across different patient populations.
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