A Novel Method of Obtaining Platelet Rich Fibrin from Rats and Quantifying Platelet Count

Engineering homologous platelet-rich plasma, platelet-rich plasma-derived exosomes, and mesenchymal stem cell-derived exosomes-based dual-crosslinked hydrogels as bioactive diabetic wound dressings

The management of diabetic wounds remains a critical therapeutic challenge. Platelet-rich plasma (PRP) gel, PRP-derived exosomes (PRP-Exos), and mesenchymal stem cell-derived exosomes (MSC-Exos) have demonstrated therapeutic potential in wound treatment. Unfortunately, their poor mechanical properties, the short half-lives of growth factors (GFs), and the burst release of GFs and exosomes have limited their clinical applications. Furthermore, proteases in diabetic wounds degrade GFs, which hampers wound repair. Silk fibroin is an enzyme-immobilization biomaterial that could protect GFs from proteases. Herein, we developed novel dual-crosslinked hydrogels based on silk protein (SP) (sericin and fibroin), including SP@PRP, SP@MSC-Exos, and SP@PRP-Exos, to promote diabetic wound healing synergistically. SP@PRP was prepared from PRP and SP using calcium gluconate/thrombin as agonist, while SP@PRP-Exos and SP@MSC-Exos were derived from exosomes and SP with genipin as crosslinker. SP provided improved mechanical properties and enabled the sustained release of GFs and exosomes, thereby overcoming the limitations of PRP and exosomes in wound healing. The dual-crosslinked hydrogels displayed shear-induced thinning, self-healing, and eradication of microbial biofilms in a bone-mimicking environment. In vivo, the dual-crosslinked hydrogels contributed to faster diabetic wound healing than PRP and SP by upregulating GFs expression, down-regulating matrix metalloproteinase-9 expression, and by promoting an anti-NETotic effect, angiogenesis, and re-epithelialization. Hence, these dual-crosslinked hydrogels have the potential to be translated into a new generation of diabetic wound dressings.

PRP Enriched with Hyaluronic Acid -PRP from Rat Protocol and Method of Preparation

Observing the positive effects of PRP (platelet-rich plasma) used in various pathologies, both in traumatology, orthopedics, sports medicine, and in plastic and reconstructive surgery, we decided to develop an improved product, using granular hyaluronic acid. The paper aims at establishing a protocol for obtaining PRP enriched with hyaluronic acid, which can be used in the current practice of treatment of skin defects, safely, with minimal side effects and limited possible, but to provide a shorter healing period as compared to native, "free" healing. The experiment aims to find an effective and rapid method of healing wounds with skin defects, by using a local adjuvant (PRP enriched with hyaluronic acid), which is available to any plastic surgeon. Following the combination of PRP with granular hyaluronic acid, we obtained a product that macroscopically has a gelatinous, viscous consistency, with a good adhesion to the tissues. The potential benefits of this experiment could be the basis for the development of treatment protocols for various pathologies, which result in wounds with skin defects, the most important aspect being the shortening of the classic healing period.

Effects of Platelet Rich Fibrin on Full Thickness Skin Grafts in the Rat Model-Planimetry Results

Platelets play a crucial role in wound healing as they are reservoirs of growth factors and cytokines which play a fundamental role in homeostasis and tissue remodeling. Recently, fields such as dermatology and plastic and reconstructive surgery have become interested in the tissue regenerative properties of these compounds, especially since it promotes wound healing, improves scar outcomes and has rejuvenating effects on the skin and other tissues. We evaluated the effects of Platelet Rich Fibrin (PRF) in full thickness skin graft healing. Our study included 40 male Wistar rats. Skin grafts were assessed macroscopically using planimetry. The full thickness skin grafts in the test group, displayed a lower necrosis rate compared to the control group. Our study displays the potential benefits of using Platelet Rich compounds to facilitate wound healing and integration of full thickness skin grafts.