title: Differences in platelet growth factor release and leucocyte kinetics during autologous platelet gel formation.
abstract: Three commercial systems for whole blood separation were compared to obtain the buffy coat composed of platelet-rich plasma (BC-PRP) and leucocytes . These samples of the buffy coat were used to make a platelet gel (PG), which was used to measure platelet growth factor (PGF) release, to perform a white blood cell (WBC) count and to measure myeloperoxidase (MPO) release from WBCs. Aliquots of whole blood obtained from ten volunteers were distributed either to a blood cell separator (The Electa Cell-Separator, E-CS) or to a tabletop centrifuge (Gravitational Platelet Sequestration System, GPS) to prepare the BC-PRP. The third system combines the BC-PRP production by E-CS with a micro porous filter (Autologous Growth Factor filter, AGF) to enrich for the BC-PRP. Autologous thrombin was used to activate the BC-PRP and to prepare the PG and subsequently to degranulate the platelet concentrate. Platelet-derived growth factor-AB and transforming growth factor-beta1 were present in high levels after thrombin activation of the E-CS or GPS prepared samples. However, the AGF prepared samples released their growth factors before thrombin activation. The WBCs were significantly increased with each of the three systems. Contrary to the AGF, no leucocyte degranulation occurred with the E-CS or GPS prepared samples, based upon the low MPO concentrations in the BC-PRP. The three types of apparatus had different harvesting capacities for collecting the enriched platelets and the release of high concentrations of PGF. When the E-CS and GPS, but not the AGF, were used, low levels of MPO were maintained in the PG, which potentially contributes to antimicrobial properties of platelet gel at the site of application.
authors.affiliation: Department of Extra Corporeal Blood Management, Catharina Hospital, Eindhoven, The Netherlands. everts@elive.nl
authors.forename: P A M
authors.initials: PA
authors.lastname: Everts
authors.forename: J
authors.initials: J
authors.lastname: Hoffmann
authors.forename: G
authors.initials: G
authors.lastname: Weibrich
authors.forename: C B
authors.initials: CB
authors.lastname: Mahoney
authors.forename: J P A M
authors.initials: JP
authors.lastname: Schönberger
authors.forename: A
authors.initials: A
authors.lastname: van Zundert
authors.forename: J T A
authors.initials: JT
authors.lastname: Knape
mesh_terms: D000328:Adult; D001781:Blood Component Removal / Q000295:instrumentation / Q000379:methods*; D001792:Blood Platelets; D001804:Blood Transfusion, Autologous; D015718:Fibrin Tissue Adhesive / Q000737:chemistry*; D005782:Gels; D006801:Humans; D007958:Leukocyte Count; D007962:Leukocytes / Q000378:metabolism; D009195:Peroxidase / Q000032:analysis*; D015539:Platelet Activation; D010982:Platelet-Derived Growth Factor / Q000378:metabolism*; D016212:Transforming Growth Factor beta / Q000378:metabolism*; D053773:Transforming Growth Factor beta1; D014945:Wound Healing / Q000502:physiology
chemical_list: D015718:Fibrin Tissue Adhesive; D005782:Gels; D010982:Platelet-Derived Growth Factor; C508960:TGFB1 protein, human; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; C095477:platelet-derived growth factor AB; D009195:Peroxidase