Recombinant human platelet-derived growth factor (PDGF) is a dimeric molecule that exists as a homodimer or as a heterodimer of the polypeptide chains. And these polypeptide chains are linked by disulfide bonds. PDGF is expressed in five forms: PDGF-AA, PDGF-AB, PDGF-BB, PDGF-CC and PDGF-DD. Platelet-Derived Growth Factor BB (PDGF-BB) is a member of the platelet-derived growth factor family and plays a crucial role in regulating cell growth, proliferation, and differentiation in various tissues.

PDGF-BB is primarily produced by platelets, endothelial cells, and smooth muscle cells and plays roles by binding to the PDGF receptor (PDGFR) on the surface of cells, leading to the activation of intracellular signaling pathways that regulate various cellular processes.
The main function of PDGF-BB is to stimulate the growth and division of mesenchymal cells, including fibroblasts and smooth muscle cells. It is involved in various physiological and pathological processes, such as wound healing, tissue repair, and cancer. In wound healing and tissue repair, PDGF-BB stimulates the growth and migration of fibroblasts, which are essential for the formation of granulation tissue and extracellular matrix. PDGF-BB has also been used in medical treatments for various conditions, such as chronic wounds, ulcers, and bone fractures. It has been shown to have potential therapeutic applications in the promotion of tissue regeneration and healing. In cancer, PDGF-BB has been overexpressed in various types of tumors, promoting cell proliferation, angiogenesis, and metastasis.