Immune system cells via cell–cell contact and secreted factors

The term Immune system cells via cell–cell contact and secreted factors refers to the integrated network of biological processes that coordinate the body's defense mechanisms, rather than a single molecular target. This system relies on two primary modes of communication: juxtacrine signaling, which involves direct physical contact between surface receptors and ligands (such as the T-cell receptor interacting with MHC molecules), and paracrine/endocrine signaling via secreted factors like cytokines, chemokines, and interferons (Alberts B, et al., Molecular Biology of the Cell, 6th ed., 2014). In a pharmacological context, this entry typically describes the broad mechanism of immunomodulators, which are drugs designed to either stimulate or suppress these interactions to treat disease (National Cancer Institute, NCI Thesaurus, 'Immunomodulator'). For example, checkpoint inhibitors block inhibitory cell-cell contacts to enhance anti-tumor immunity, while biologics like TNF-alpha inhibitors neutralize secreted factors to reduce chronic inflammation (Janeway CA Jr, et al., Immunobiology, 5th ed., 2001). Because this term encompasses a vast array of distinct proteins, cell types, and pathways, it is classified as a therapeutic category or biological system rather than a specific druggable receptor or enzyme.

Other names

Immune systemImmunomodulationCell-mediated and humoral immunityImmune cell communicationParacrine and juxtacrine signaling

Modulation of the immune response through the alteration of physical cell-to-cell interactions or the signaling of secreted cytokines and chemokines.