Tumor necrosis factor receptor superfamily member 5 - CD40 ligand interaction (CD40-CD40L)

The CD40 - CD40 ligand (CD40L) interaction is a fundamental costimulatory pathway that mediates communication between the adaptive and innate immune systems (UniProt P25942, P29965). CD40, a member of the tumor necrosis factor receptor superfamily (TNFRSF5), is expressed on antigen-presenting cells such as B cells, dendritic cells, and macrophages, while its ligand, CD40L (CD154), is primarily expressed on activated CD4+ T cells and platelets (PubMed: 19760064). This interaction is essential for B-cell activation, immunoglobulin isotype switching, and the formation of germinal centers, as well as for the maturation of dendritic cells and the enhancement of T-cell responses (Frontiers in Immunology, 2019). Dysregulation of the CD40-CD40L axis is a hallmark of many autoimmune and inflammatory diseases, including systemic lupus erythematosus, rheumatoid arthritis, and atherosclerosis (NIH: PMC2828528). In oncology, CD40 signaling is targeted to promote anti-tumor immunity by activating dendritic cells to prime cytotoxic T cells (Wikipedia: CD40). Therapeutic approaches include antagonistic antibodies or proteins to block the interaction in autoimmunity and transplant rejection, and agonistic antibodies to stimulate CD40 in cancer immunotherapy (Nature Reviews Drug Discovery, 2017). However, early clinical development of anti-CD40L antibodies was hindered by significant thromboembolic risks, leading to the development of next-generation agents that avoid platelet activation (ResearchGate: 330924444).

Other names

CD40-CD154 interactionTNFRSF5-TNFSF5 interactionCD40-gp39 interactionCD40-CD40L axisCD40-CD40L pathwayCD40CD40 ligandCD154TNFRSF5TNFSF5

Drugs targeting this interaction function either as antagonists to block the binding of CD40L to CD40, thereby suppressing immune activation in autoimmune diseases and transplant rejection, or as agonists to stimulate CD40 signaling, which enhances anti-tumor immunity by activating antigen-presenting cells and promoting T-cell-mediated responses.