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Updated: Aug 8, 2026
Generation of Human CD40-activated B cells
Published on: October 17, 2009
Functional expression of CD40 antigen on human epidermal Langerhans cells
J Péguet-Navarro1, C Dalbiez-Gauthier, F M Rattis
1INSERM Unit 346, E.Herriot Hospital, Lyon, France.
Insights
CD40 signaling on dendritic cells enhances their viability and T cell allostimulatory function. This interaction, involving CD40 ligand, is crucial for normal T cell development and immune responses.
Area of Science:
- Immunology
- Cell Biology
Background:
- CD40-CD40L interactions regulate B cell function.
- The role of CD40 on dendritic cells (DCs) is less understood.
- Dendritic cells are key antigen-presenting cells.
Purpose of the Study:
- To investigate the functional significance of CD40 expression on human dendritic Langerhans cells (LCs).
- To determine the effects of CD40 triggering on LC phenotype and function.
Main Methods:
- Isolated human epidermal LCs.
- Utilized CD40-L transfected cells for CD40 triggering.
- Analyzed LC surface marker expression (CD54, CD86, HLA-DR, CD1a, CD58, CD80) via flow cytometry.
- Assessed LC allostimulatory capacity using fixed LCs.
- Investigated T cell response inhibition using anti-CD40 and anti-CD40-L antibodies.
Main Results:
- CD40 is expressed on human LCs.
- CD40 triggering enhanced LC viability and induced phenotypic alterations.
- Upregulation of CD54 and CD86 observed after CD40 activation.
- Enhanced allostimulatory properties of activated LCs.
- Antibodies against CD40/CD40-L inhibited T cell responses to LCs.
Conclusions:
- CD40/CD40-L signaling plays a significant role in LC function.
- This interaction supports normal T cell development and immune responses.
- CD40 engagement modulates DC phenotype and enhances antigen presentation capabilities.
Abstract:
It is now well established that interactions of CD40 on the B cells, along with its ligand (CD40-L) on the T cells, regulate B cell proliferation and differentiation. However, the functional significance of CD40 expression on cells known for most efficient Ag-presenting function, i.e., dendritic cells, is not so clear. In this study, we demonstrate that CD40 is expressed on human dendritic Langerhans cells (LC) freshly isolated from epidermis. Using CD40-L transfected cells, CD40 triggering was found to enhance LC viability when cultured and to result in phenotypic alterations. Thus, a 2-day CD40 activation induced up-regulation of CD54 and CD86 at the LC surface, while it did not significantly affect the levels of HLA-DR, CD1a, CD58, and CD80 expression. These phenotypic changes correlate with enhanced LC allostimulatory property, as shown by the use of paraformaldehyde-fixed LC. Furthermore, mAbs against CD40, as well as CD40-L, strongly inhibit the primary T cell response to allogeneic LC. Collectively, these data support a role for CD40/CD40-L pair in the development of normal T cell functions.
