The authors found that the stimulation for proliferation of endothelial cells peak at 1.25 × 10 6 and angiogenesis at 1.5 × 10 6 platelets/mL, respectively. The proliferation of endothelial cells and its migration and the invasion of endothelial cells occurred in a bell-shaped manner. studied the relationship between the concentration of platelets in platelet gel and changes in the functional activity of human endothelial cells. There is a scarcity of studies stating the concentration at which optimal stimulation occurs.
Marx proposed that platelet count of 10 lakh/ml in 5 mL of PRP, as a working definition of PRP, based on the scientific proof of bone and soft tissue healing enhancement. The active secretion of these growth factors by platelets begins within 10 min after activation, with more than 95% of the pre-synthesized growth factors secreted within 1 h. thus provoking tissue repair and tissue regeneration. These agonists bound transmembrane receptors then activate an intracellular signal protein that causes the expression of a gene sequence that directs cellular proliferation, matrix formation, osteoid production, collagen synthesis etc. The active proteins are then secreted, binding to transmembrane receptors of target cells, which include mesenchymal stem cells, osteoblasts, fibroblasts, endothelial cells and epidermal cells. PDGF, TGF-β etc.) are transformed to a bioactive state by the addition of histones and carbohydrate side chains. Activation causes the granules present in platelets to fuse to its cell membrane (also called degranulation) where the secretory proteins (e.g.
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