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Updated: Aug 8, 2026
Murine Model of CD40-activation of B cells
Published on: March 6, 2010
CD4+ cells from patients with Common Variable Immunodeficiency have a reduced ability of CD40 ligand membrane
D Brugnoni1, P Airò, M Lebovitz
1Servizio di Immunologia Clinica, Spedali Civili, Brescia, Italy.
Insights
Common Variable Immunodeficiency (CVID) involves impaired antibody production. This study found reduced CD40 Ligand (CD40L) expression on T-cells in CVID patients, indicating a potential T-cell defect contributing to the condition.
Area of Science:
- Immunology
- Cell Biology
Background:
- Common Variable Immunodeficiency (CVID) is defined by inadequate antibody production, potentially stemming from B-cell or T-cell dysfunction.
- Defective expression of CD40 Ligand (CD40L), crucial for T-cell to B-cell signaling, has been observed in some CVID patients.
Purpose of the Study:
- To investigate intrinsic functional abnormalities in CD4+ lymphocytes contributing to defective CD40L expression in CVID.
- To quantify CD40L expression on CD4+ cells in CVID patients compared to healthy controls.
Main Methods:
- Purification of CD4+ lymphocytes from eight CVID patients and eight age-matched controls.
- Stimulation of purified CD4+ cells with PMA/Ionomycin.
- Flow cytometry analysis of CD40L expression using specific monoclonal antibodies.
Main Results:
- A significant reduction in the percentage of CD40L-expressing CD4+ cells was observed in CVID patients compared to controls, even after age-matching.
- A decreased density of CD40L expression on CD4+ cells was noted in CVID patients.
- CD40L expression levels correlated with age in both CVID patients and healthy individuals.
Conclusions:
- The findings suggest intrinsic functional abnormalities in CD4+ lymphocytes, specifically reduced CD40L expression, contribute to CVID pathogenesis.
- The defect in CD40L expression is variable among CVID patients and may be marginal in some cases.
Background:
Common Variable Immunodeficiency (CVID) is characterized by defective antibody production. This has been variably attributed to intrinsic B-cell defects or to T-cell disfunctions. Recently, it has been reported that the expression of the CD40 Ligand (CD40L), a T-cell surface molecule that plays a critical role in the cell-contact-mediated helper signals provided to B-cells, is defective in a subset of patients with CVID.
Methods:
To demonstrate that the defective expression is due to intrinsic functional abnormalities of CD4+ lymphocytes, CD4+ cells were purified from eight patients with CVID and eight age-paired controls, stimulated with PMA+Ionomycin, and studied for CD40L expression by flow cytometry using specific monoclonal antibodies.
Results And Conclusions:
The percentage of CD4+ cells expressing CD40L after optimal stimulation was correlated with age both in patients with CVID (r: 0.74; p: 0.04) and in healthy controls (r: 0.73; p: 0.04). The percentage of CD40L+ cells was reduced in patients with CVID compared to that of controls (p: 0.02 when data are paired for age) with a reduced density of expression (p: < 0.01). The defect was variable in different patients and in some cases it was marginal.
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