Tissue repair via paracrine signaling

Tissue repair via paracrine signaling refers to the biological phenomenon where certain cells—most notably mesenchymal stem/stromal cells—secrete soluble mediators such as growth factors (FGFs, VEGFs), cytokines (ILs), chemokines and extracellular vesicles into their immediate environment. These mediators act locally on neighboring damaged tissues by binding specific surface receptors on recipient cells. This triggers intracellular cascades promoting processes like angiogenesis, reduced inflammation, increased cellular survival/proliferation/migration and ultimately enhanced tissue regeneration. Importantly, these effects occur even when donor/therapeutic cells do not engraft long-term within the repaired tissues; instead their transient presence suffices due to robust activation of endogenous reparative programs through these secreted signals. This concept underpins much current research into “cell-free” regenerative therapies using conditioned media or purified exosomes from therapeutic cell types. However—as it does not denote any one molecular entity—it should not be treated as an individual druggable target.

Other names

Paracrine-mediated tissue repairParacrine effect in regenerationParacrine wound healing

Secretion of growth factors/cytokines/chemokines that bind receptors on local cells and activate downstream regenerative pathways. Promotion of angiogenesis, reduction of inflammation, stimulation of resident progenitor/stem cell activity.