Multiple immune cell populations via cell-cell contact and paracrine immunomodulators

The term Multiple immune cell populations via cell-cell contact and paracrine immunomodulators does not refer to a single molecular target or receptor, but rather describes a complex physiological process involving the coordinated interaction of various immune cell types. These interactions occur through direct physical engagement between cells, such as checkpoint protein binding, and the release of soluble mediators like cytokines and chemokines that influence the local environment [Janeway's Immunobiology, 9th Ed]. In therapeutic contexts, this description often characterizes the broad mechanism of action for immunotherapies that aim to reprogram the immune microenvironment rather than inhibit a single enzyme or receptor [Science, 2015]. For example, checkpoint inhibitors and CAR-T cell therapies rely on these multicellular interactions to mount an effective anti-tumor response. Because this process involves a wide array of ligands, receptors, and cell lineages, it is associated with systemic safety concerns such as cytokine release syndrome and diverse immune-related adverse events [NEJM, 2018]. Consequently, this entry is classified as a systemic biological mechanism or a multi-target therapeutic approach rather than a discrete molecular entity.

Other names

Immune system modulationMulticellular immune signalingParacrine and juxtacrine immune regulationImmune microenvironment modulation

Modulation of the immune microenvironment through direct cell-to-cell contact (juxtacrine signaling) and the secretion of soluble factors (paracrine signaling) to alter the activity of various immune cells such as T cells, B cells, macrophages, and dendritic cells [Nature Reviews Immunology, 2018].