Immune system via cell-contact and paracrine signaling

Immune system via cell-contact and paracrine signaling is a broad physiological category describing the primary modes of communication between immune cells. Cell-contact signaling, or juxtacrine signaling, requires direct physical interaction between membrane-bound proteins, such as the binding of T-cell receptors to MHC-peptide complexes on antigen-presenting cells (Murphy & Weaver, Janeway's Immunobiology, 2016). Paracrine signaling involves the secretion of short-range soluble factors, primarily cytokines and chemokines, which bind to receptors on neighboring cells to elicit specific biological responses (Alberts et al., Molecular Biology of the Cell, 2002). These communication channels are vital for the spatial and temporal coordination of the immune system, including the recruitment of leukocytes to sites of infection and the regulation of inflammatory intensity (Abbas et al., Cellular and Molecular Immunology, 2017). Dysregulation of these signaling networks is central to the pathogenesis of autoimmune diseases, chronic inflammation, and the establishment of the tumor microenvironment. Because this term encompasses a vast array of distinct molecular interactions rather than a single protein or gene product, it is not considered a discrete therapeutic target. Instead, drug development focuses on specific nodes within this system, such as checkpoint inhibitors or cytokine-neutralizing antibodies, to achieve therapeutic effects.

Other names

Immune cell communicationJuxtacrine and paracrine immune signalingCell-to-cell signaling in the immune system

Not applicable as this is a biological process/system, not a single molecular target.