Efficacy of Gelatin Hydrogel Impregnated With Concentrated Platelet Lysate in Murine Wound Healing

Background The efficacy of a gelatin hydrogel (GH) sheet impregnated with platelet-rich plasma in full-thickness wound healing has been reported. Human platelet lysate is another potential natural product for use in wound healing. The present study examined the effects of a GH sheet impregnated with concentrated freeze-dried platelet lysate on wound healing after storage for 9 mo. Materials and methods Platelet concentrates were subjected to three freeze-thaw cycles and freeze-dried then preserved at 4°C. Reconstitution with saline was then performed to produce 1-fold (hPL1), 2-fold (hPL2), and 3-fold (hPL3) concentrations of preserved platelet lysate. Full-thickness wounds were made on the back of male C57Bl6J/Jcl mice. Wounds were treated with saline, hPL1, or a GH sheet impregnated with saline, hPL1, hPL2, or hPL3. Histologic examinations using hematoxylin–eosin, Azan, and anti-CD31 staining were performed on days 4, 7, and 14 to assess neoepithelialization and granulation tissue and capillary formation. Results This study showed that the GH sheet itself or the simple administration of hPL1 did not accelerate the healing process. However, the GH sheet impregnated with hPL1 accelerated the granulation tissue formation to some extent, and the GH sheet impregnated with hPL2 or hPL3 clearly accelerated the capillary formation and the granulation tissue formation. In addition, the GH sheet impregnated with hPL3 had the longest epithelium formation. Conclusions A GH sheet impregnated with long-term preserved 2-fold or 3-fold concentrated platelet lysate enhances the wound healing process.