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Elevated CD154 (CD40 ligand) synthesis in T-cells from allergic patients after nonspecific stimulation in vitro
U R Markert1, C Bär, J H Niess
1Institut für Klinische Immunologie, Friedrich-Schiller-Universität, Jena, Germany.
Insights
T-cells from allergic patients show a higher capacity for CD154 synthesis compared to healthy individuals. This enhanced CD154 (CD40 ligand) production may contribute to elevated IgE levels in allergies.
Area of Science:
- Immunology
- Allergy Research
- Cell Biology
Background:
- The CD154 molecule (CD40 ligand) on T-cells interacts with CD40 on B-cells, crucial for immunoglobulin class switching.
- Allergic diseases are often associated with elevated IgE production by B-cells.
Purpose of the Study:
- To compare the intracellular CD154 expression in T-cells from allergic patients and healthy donors following non-specific stimulation.
- To investigate the potential role of T-cell CD154 synthesis in the pathogenesis of allergic diseases.
Main Methods:
- Blood samples from 104 allergic patients and 44 healthy donors were analyzed.
- T-cells were isolated and stimulated with phorbol-12-myristate-13-acetate and ionomycin.
- Intracellular CD154 expression was quantified using fluorescence-activated cell sorter (FACS) analysis.
Main Results:
- Allergic patients exhibited a significantly higher increase in intracellular CD154+ T-cells (6.1%) and mean fluorescence intensity (28.1%) compared to healthy donors (1.4% and 4.6%, respectively).
- These findings indicate an elevated capacity for CD154 synthesis in T-cells from allergic individuals.
- The results suggest a potential link between enhanced T-cell CD154 production and increased IgE levels in allergic patients.
Conclusions:
- T-cells from allergic patients demonstrate an enhanced capability for CD154 synthesis, independent of B-cells.
- This heightened CD154 production may partially explain the enhanced IgE production observed in B-cells of allergic patients.
- Further research is warranted to elucidate the precise mechanisms linking T-cell CD154 expression to allergic disease pathogenesis.
Abstract:
The interaction of the CD154 molecule (CD40 ligand, gp39) on activated T-cells with the CD40 antigen on B-cells seems to play a key role in immunoglobulin class switching. We aimed to compare the capacity of intracellular CD154 expression after nonspecific stimulation with phorbol-12-myristate-13-acetate and ionomycin on separated T-cells from allergic patients and healthy donors. We analyzed blood from 104 patients allergic to grass pollen, house dust mites or birch pollen, and from 44 healthy donors. Lymphocytes were isolated using a density gradient and B-cells were extracted by magnet-activated cell separation (MACS) using anti-CD19 microbeads. Cells were nonspecifically stimulated for 5 h, permeabilized and stained with anti-CD154 for fluorescence-activated cell sorter analysis. It was found that stimulation induced a 1.4% increase of intracellular CD154+ T-cells; a 4.6% increase of mean channel fluorescence of all T-cells from healthy donors; a 6.1% increase in intracellular CD154+ T-cells; and a 28.1% increase of mean channel fluorescence of all T-cells from allergic patients. The data demonstrated an elevated capability of B-cell independent CD154 synthesis in T-cells from allergic patients when compared to healthy individuals. It is possible that the enhanced IgE production of B-cells from allergic patients might be partly due to the phenomena described.
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