What role does platelet-derived growth factor (PDGF) play in the healing process?

• A. Inhibits fibroblast activity
• B. Stimulates fibroblast proliferation and migration
• C. Controls the apoptosis of immune cells
• D. Regulates vascular permeability

Answer: (B)

Platelet-derived growth factor (PDGF) plays a crucial role in the healing process primarily by stimulating fibroblast proliferation and migration. Fibroblasts are essential cells in the wound healing process as they are responsible for producing collagen and other extracellular matrix components, which are vital for tissue repair and regeneration.

During the healing response, PDGF is released by platelets and various cell types, including macrophages. This growth factor not only promotes the proliferation of fibroblasts but also encourages their migration to the site of injury, where they can contribute to the formation of granulation tissue and eventual scar formation. This process is important for restoring the structural integrity and functional capacity of the tissue.

The other options presented do not align with the established functions of PDGF in tissue healing. While regulating vascular permeability, stimulating angiogenesis, and influencing immune cell activity are important aspects of the wound healing process, they are not the primary actions of PDGF. The dominant role of PDGF in enhancing fibroblast activity underscores its significance in the overall healing process, making it a key factor in tissue repair.