Multiple immune cell populations via paracrine factors and cell–cell contact

The phrase 'Multiple immune cell populations via paracrine factors and cell–cell contact' does not refer to a single molecular target, receptor, or enzyme, but rather describes a complex immunomodulatory mechanism typically associated with Mesenchymal Stem Cells (MSCs) and other cell-based therapies. This process involves the regulation of T cells, B cells, natural killer cells, and macrophages through two primary pathways: the secretion of soluble paracrine factors and direct physical interaction (Nature Reviews Immunology, 2008). Key paracrine mediators involved include Indoleamine 2,3-dioxygenase (IDO), Prostaglandin E2 (PGE2), and Transforming Growth Factor-beta (TGF-β), which collectively inhibit pro-inflammatory responses (Journal of Autoimmunity, 2016). Simultaneously, cell-cell contact via molecules such as Programmed Death-Ligand 1 (PD-L1) and Galectins provides potent inhibitory signals to activated immune cells (Frontiers in Immunology, 2018). This multi-targeted approach is utilized therapeutically to treat conditions like Graft-versus-Host Disease (GvHD) and Crohn's disease, where broad suppression of the immune system is required. Because this entry represents a physiological process or a therapeutic mode of action rather than a discrete protein, it is classified as an incorrect target designation for structured pharmacological data. It serves as a functional description of how certain advanced medicinal products interact with the host immune system to restore homeostasis.

Other names

MSC-mediated immunomodulationParacrine and contact-dependent immune regulationCell-mediated immune suppression

Immunomodulation through the simultaneous secretion of anti-inflammatory paracrine mediators and direct inhibitory cell-surface interactions with various immune effector cells.