Platelet-Rich Plasma in Regenerative Medicine: Biological Mechanisms, Preparation Methods, Clinical Applications, and Current Challenges

Platelet-rich plasma (PRP) is a blood product that is enriched with platelets, growth factors, and cytokines. It is a gradually acknowledged technique in the field of regenerative medicine that not only promotes tissue healing but also induces the formation of new blood vessels and the regeneration of the extracellular matrix. Nevertheless, the clinical situations in which PRP therapy is applied, such as orthopedic, dermatological, dental, and wound healing treatments, is still considerably affected by the specific preparation, activation, and patient-matching techniques used and thus exhibit variable outcomes. This review intends to offer a critical discourse on the biological mechanisms, preparation techniques, clinical applications, and challenges facing PRP therapy, thereby giving a synthesis of evidence and spotting the chances for enhancing efficacy and standardization. Aided by the concentrated growth factors such as PDGF, TGF-β, VEGF, EGF, and IGF-1, PRP stimulates the formation of new tissue by attracting and turning active fibroblasts, endothelial cells, and osteoblasts which are the main players of the respective processes, additionally increasing the blood supply and releasing more extracellular matrix substances such as collagen.  The different factors such as the concentrations of platelets and leukocytes, the methods of activation, the age of the patient, the presence of other diseases, and the type of pathology are all together responsible for the variability in clinical outcomes. Among the new techniques that could possibly overcome these issues are exosome-enriched PRP, platelet lysates and therapies that combine biomaterials or stem cells. However, the automatized preparation systems can deliver more uniform platelet concentrations than the manual ways do but the high price and lack of access are the two remaining hurdles. The following areas of work are important for maximizing the benefits of the therapy: standardization of PRP preparation and administration protocols, mechanistic studies, large-scale randomized controlled trials, and development of personalized, patient-specific formulations. The writers of this critique want to lay down a vast and detailed base for blending PRP into the area of evidential regenerative medicine, besides; they want to indicate the paths for further diagnostics and clinical studies.