Cd40 Ligand
Cd40 Ligand - Related Videos
12:24
Murine Model of CD40-activation of B cells
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Cited by 13 •
2010
In this video, we demonstrate the procedure of CD40-activation and expansion of murine B cells from splenocytes of C57BL/6 mice, which can be used as a model antigen-presenting cell (APC) to study induction of immunity.
13:27
Generation of Human CD40-activated B cells
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Cited by 36 •
2009
In this video we present the ex vivo generation and expansion of human CD40-activated B cells (CD40-B) from peripheral blood mononuclear cells (PBMC) by stimulation with CD40 ligand and interleukin-4.
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:51
Metal-Ligand Bonds
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2020
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes. In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:49
Ligand Binding and Linkage
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2020
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
FAQs
Binding between CD40L and CD40 activates NF-κB-dependent signaling and strengthens co-stimulatory communication. In B cells, these signals support proliferation, germinal-center formation, immunoglobulin class switching, and antibody production. In dendritic cells and macrophages, the same interaction promotes activation, linking T-cell help with stronger antigen-presenting-cell responses during adaptive immune reactions.
CD40L provides a crucial signal that connects activated CD4+ T-cell recognition with B-cell functional changes. Rather than simply increasing cell number, the interaction supports germinal-center development and immunoglobulin class switching, allowing B cells to progress toward effective antibody production. This makes CD40L-dependent communication central to the organization and quality of humoral immunity.
Defective CD40L signaling disrupts the cooperation required for normal B-cell maturation and antibody responses. Because immunoglobulin class switching and germinal-center formation depend on this pathway, impaired communication can produce hyper-IgM syndrome. Studying this disorder helps researchers connect a specific molecular signaling failure with broader defects in adaptive immune regulation.
CD40L expressed by activated CD4+ T cells can stimulate CD40-bearing dendritic cells and macrophages as well as B cells. This broad target range allows one T-cell-derived signal to influence antigen presentation, co-stimulation, and antibody-related responses. The pathway therefore coordinates cellular and humoral branches of adaptive immunity instead of acting only within the B-cell compartment.
CD40L-based pathways are relevant to vaccine design because they regulate communication between activated CD4+ T cells, B cells, and antigen-presenting cells. Researchers can use this biological framework to consider how co-stimulatory signaling may support germinal-center formation, class switching, and antibody production. These outcomes provide context for evaluating how vaccination elicits coordinated adaptive immune responses.
The pathway is investigated across these fields because it controls co-stimulatory interactions among immune cells and influences both antigen-presenting-cell activation and antibody responses. In immunotherapy and transplantation, researchers examine its potential relevance to immune regulation, while inflammatory disease studies consider how the same signaling network may contribute to inappropriate or excessive immune activity.