Multiple Paracrine Signaling Pathways

This entry refers to a category of molecular pathways rather than a specific molecular target. Paracrine signaling via growth factors, cytokines, and extracellular vesicles is fundamental in mediating cell communication across short distances in tissues[5][1][7]. These pathways regulate critical biological processes including cell proliferation, differentiation, inflammation, tissue repair, neuroprotection, angiogenesis, inhibition of apoptosis, and wound healing[1][3][2][4][7]. Growth factors and cytokines are soluble proteins that bind specific cell surface receptors, triggering intracellular signaling cascades to elicit physiological changes. Extracellular vesicles (EVs) are membrane-bound nano- to micron-scale particles released by cells that deliver bioactive cargo—including proteins, lipids, RNA, and signaling mediators—to recipient cells, directly affecting their function and phenotype[2][4][8]. These mechanisms play roles in cancer biology, inflammatory and immune responses, neurodegeneration, cardiovascular pathologies, and other disease states, but do not correspond to a unique therapeutic target; rather, they comprise a complex signaling network with wide-ranging clinical relevance and therapeutic opportunity. This entry is incorrect as a target because it refers to multiple classes and mechanisms rather than a singular, canonical therapeutic molecule or receptor. For structured target information, further specification of a unique molecule or receptor (e.g., Fibroblast growth factor receptor, Interleukin-6 receptor, Epidermal growth factor receptor) is required[1][3][5].

Other names

Growth factorsCytokinesExtracellular vesiclesParacrine factors

Ligand-receptor interaction; Activation of receptor tyrosine kinase pathways (e.g., MAP kinase, PI3K, Ral pathway); Uptake and cargo delivery via extracellular vesicles; Modulation of immune and inflammatory responses