Multiple immune cell populations via paracrine cytokines and enzymes

Multiple immune cell populations via paracrine cytokines and enzymes refers to a complex, system-level immunomodulatory mechanism rather than a single molecular target. This process is most prominently associated with the therapeutic action of Mesenchymal Stem Cells (MSCs) and their secretome, which influence the behavior of diverse immune cells including T cells, B cells, natural killer (NK) cells, and macrophages [1, 3]. The mechanism relies on the secretion of paracrine factors, such as cytokines (e.g., IL-10 and TGF-β) and metabolic enzymes (e.g., indoleamine 2,3-dioxygenase and cyclooxygenase-2), which collectively suppress pro-inflammatory responses and promote immune tolerance [2, 5]. In clinical settings, this multi-targeted approach is utilized to treat inflammatory and autoimmune conditions, such as graft-versus-host disease (GvHD) and Crohn's disease, where a broad reset of the immune environment is required [1, 2]. Because this description encompasses a wide array of signaling molecules and cellular interactions, it is considered a mechanism of action for cell-based or secretome-based therapies rather than a discrete druggable protein [3, 5].

Other names

Mesenchymal stem cell immunomodulationMSC paracrine signalingMesenchymal stromal cell secretomeImmune microenvironment modulationParacrine immune regulation

Mesenchymal stem cells (MSCs) exert therapeutic effects by secreting a variety of paracrine factors, including cytokines (e.g., IL-10, TGF-β) and enzymes (e.g., IDO, COX-2), which act on multiple immune cell populations to suppress inflammation and promote tissue repair [1, 2].