Investigating the production of platelet lysate obtained from low volume Cord Blood Units: Focus on growth factor content and regenerative potential

Background: The regenerative potential of platelet lysate (PL) and platelet gel (PG) is mediated by the release of platelets (PLTs) growth factors. The aim of this study was the evaluation of the PL production utilizing low volume single Cord Blood Units (CBUs) and the comparison of the biomolecule content between PLs obtained from intermediate and high volume CBUs. Methods: CBUs (n = 90) with volumes greater than 50 ml and initial platelet count > 150 × 109/L were used. CBUs were classified into the following groups: group A (50–80 ml), group B (81–110 ml) and group C (111–150 ml). The CBUs were centrifuged twice for the production of the platelet concentrate (PC), which was stored at − 80 °C for at least 48 h. Then, rapidly thawed and the biomolecule content was determined using commercial ELISA kits. The regenerative potential of PLs was evaluated using the scratch wound and in vitro angiogenesis assay. Results: CBPL was produced from low volume single CBUs and contained 3.4 ± 0.3 ×109 PLTs. PL obtained from intermediate and high volume CBUs consisted of 10.2 ± 0.3 and 16.1 ± 0.4 × 109 PLTs. All PL groups were characterized by high biomolecule content. Gap closure was observed within 72 h after the wound assay initiation and the capillary tubes were formed in all study groups. Conclusion: This study provided significant evidence regarding the utilization of the low volume CBUs for the production of CB derivatives, thus can serve as healing mediators in regenerative medicine approaches. © 2022 Elsevier Ltd