<b>Efeitos do plasma rico em plaquetas (PRP) fresco e liofilizado na regeneração de pele em ratos</b>

Abstract

CAMPOS, RA. Efeitos do Plasma Rico em Plaquetas (PRP) fresco e liofilizado no modelo de regeneração de pele em ratos [Effects of Platelet Rich Plasma (PRP) fresh and lyophilized on skin regeneration model in rats] 2018. 64f. Dissertação (Mestrado em Ciências) -Platelet Rich Plasma (PRP) is a blood cell derived product obtained by centrifugation, which contains a high concentration of growth factors in a small volume of plasma. This procedure has been used since the 1950s and has been widely used in various areas such as Orthopedics, Dentistry, Cardiology, Ophthalmology, Dermatology for use in chronic wound repair, especially in diabetic patients or patients with venous complications, mucosal wounds, connective tissues, pathologies of the musculoskeletal system, fracture surface, bone graft, among others. In scarring and deficient tissues, there is an impairment of the ideal levels of growth factors in the wound healing phases. Therefore, it is important to maintain adequate levels of growth factors in all the different stages of tissue repair. The preparation of PRP is a non-standard procedure, with variable results being observed in the literature, being able to be involved with the amount of growth factors and methods of preparation. Usually, more than one PRP application is required involving a new blood collection for each application in order to accelerate tissue regeneration. The blood collections are invasive for the patient, being expensive in time and labor in the operational procedure, implying in the increase of the cost. The early preparation of PRP with possibility of storage for use in future applications during treatment could be an important solution to avoid the discomfort of patients, who often no longer have a good quality of life.Therefore, the present study aimed to compare the difference in the healing process for seven days in a nude rat dorsal lesion model, treated with human fresh PRP or stored PRP (prepared by lyophilization and stored at room temperature for 15 days, from two different donors, and compared to the application of recombinant human BB platelet-derived growth factor (rhPDGF-BB), one of the most abundant growth factors in PRP. The results showed comparative efficacies in the treatments of wounds with rhPDGF-BB (positive control) and with fresh PRPs or room temperature stored PRP of both donors, indicating the possibility of collecting blood from the patient only once and storing the same until the reconstitution of the product on the day of application, allowing the offer of a