Multicellular immune system via cell-cell contact and soluble mediators

The multicellular immune system functions through a highly coordinated network of cell-cell contact and soluble mediators to protect the host from infection and malignancy. Cell-cell contact involves the physical interaction of surface molecules, such as the immunological synapse formed between T cells and antigen-presenting cells, which is critical for specific immune activation (Dustin, 2014; Abbas et al., 2021). Soluble mediators, including cytokines, chemokines, and interferons, serve as extracellular signals that regulate the intensity and duration of the immune response across different tissues (Dinarello, 2007; Murphy & Weaver, 2016). Dysregulation of these communication pathways is central to the pathogenesis of numerous conditions, including chronic inflammation, autoimmune disorders, and the immune evasion observed in cancer. While this system is the focus of modern immunotherapy, the term itself refers to a broad physiological process rather than a single, discrete molecular target like a specific receptor or enzyme. Consequently, therapeutic agents are designed to modulate specific components of this system—such as TNF-alpha inhibitors or checkpoint blockades—rather than the system in its entirety. This entry is therefore classified as a biological mechanism or system description rather than a specific therapeutic target.

Other names

Immune system communicationCell-cell contact and cytokine signaling

Not applicable (Biological system description)