Growth factors are proteins that tell cells when to proliferate, migrate, and differentiate. In tissue repair, that makes them some of the most important molecular signals in the entire healing cascade. Without them, cells would have far less direction about where to go, when to divide, and what kind of tissue program to adopt.

Three families dominate most repair conversations: EGF pushes epithelial proliferation, VEGF promotes angiogenesis, and FGF supports fibroblast activity and collagen production. Together they coordinate surface closure, blood-vessel support, and matrix rebuilding.

These growth factors act by binding receptor tyrosine kinases on cell membranes. Once activated, those receptors trigger intracellular cascades such as MAPK and PI3K/Akt, which carry the message inward until the nucleus changes gene-expression output. In other words, the surface receptor hears the signal, and the cell rewrites its behavior in response.

Downstream adhesion pathways matter too. The FAK-paxillin axis helps translate external repair signals into migration behavior, which is one reason growth-factor signaling is so tightly linked to movement at an injury site rather than just proliferation in place.

BPC-157 is studied for its reported ability to upregulate multiple growth factor families at once. That helps explain why its tissue-repair profile appears across tendons, gut tissue, vasculature, and other models: the growth-factor network is broadly reused across tissue types.

Understanding the pathway first makes the compound-level literature easier to read. If a study reports more VEGF, more fibroblast migration, or faster angiogenesis, it is pointing back to this same signaling architecture.