Transforming growth factor-β signalling pathway in tendon healing.

Transforming growth factor-β(TGF-β) plays an important but diverse role in tendon injuries, such as collagen synthesis, cell proliferation, cell differentiation, and cell adhesion, leading to tendon healing and tendon fibrosis. In the well-known canonical TGF-β signalling pathway, TGF-β activates Smad signalling through its two cell surface receptors, which leads to Smad-mediated transcriptional regulation and is also regulated by inhibitory Smads, forming a negative feedback regulatory pathway. In the context of the canonical TGF-β signalling mechanism mediated by Smad, the activated receptors also send signals through other signal transducers, which in the backdrop of TGF-β signaling are collectively known as non-Smad signalling pathways. Activated TGF-β binds to the receptor and acts through these signalling pathways. Understanding the mechanism of the TGF-β signalling pathway and its role in tendon repair is of great significance for targeting the TGF-β signalling pathway to accelerate tendon healing and reduce tendon fibrosis.