Paracrine immune modulation by mesenchymal stem cell-derived secretome

Paracrine immune modulation by mesenchymal stem cell-derived secretome refers to the collective influence of soluble factors, extracellular vesicles, cytokines, growth factors, and exosomes secreted by MSCs on the immune system. Instead of direct cell replacement or engraftment, the therapeutic benefit of MSCs is now understood to rely predominantly on the release of bioactive molecules that regulate immune responses (e.g., suppressing pro-inflammatory cytokine production, promoting anti-inflammatory macrophage phenotypes, supporting T regulatory (Treg) cell expansion, and modulating lymphocyte activity). These paracrine products act in a highly context-specific manner, adapting to microenvironmental cues and influencing downstream repair, regeneration, and immune modulation pathways across a range of diseases, notably those involving inflammation and immune dysregulation. This process is not a discrete target but a multifaceted, cell-derived therapeutic mechanism.

Other names

MSC paracrine immunomodulationMesenchymal stem cell secretomeMSC-derived soluble factorsMSC extracellular vesicle immunomodulationExosome-mediated immune regulation by MSCs

Secretion of anti-inflammatory cytokines (e.g., IL-10, IL-4) Release of growth factors (e.g., VEGF, HGF) Delivery of microRNAs via extracellular vesicles and exosomes Modulation of immune cell polarization (macrophages: M1→M2, T-reg formation) Suppression of inflammatory cytokine release