Ex vivo expansion of cord blood mononuclear cells by umbilical cord blood platelet lysate

In spite of promising results in treatment of blood diseases by umbilical cord blood cell transplantation, low number of derived stem cells has been a matter of concern. Since platelets extracts has been introduced as a potent mesenchymal stem cell culture supplement, the purpose of current study was to investigate the probable effects of umbilical cord blood platelet lysate (UCB-PL) in proliferation, survival and differentiation of cord blood mononuclear cells.
The umbilical cord blood platelet lysate (UCB-PL) was added to cord blood mononuclear cells culture (1×10 6 /mL) in presence of FLT3L, TPO and SCF. The effective dose of UCB-PL, cell viability and differentiation of mononuclear cells were determined by trypan blue staining and colony assay method, respectively. The number of mononuclear cells was measured by flowcytometric analysis of CD133 CD34࠽ cells. Quantitative expression of CD 34 was performed by QRT-PCR method.
Combination of 5% of UCB-PL with mentioned cytokines yielded a 12-fold cell proliferation in comparison with control group. A higher concentration of UCB-PL showed cytotoxic effects. CD 34 also increased significantly in group of 5% UCB-PL treated cells. In this particular group, a significant increase of colony forming units granulocytes-erythroidmacrophages-megakaryocyte (CFU-GMMM) and granulocyte-macrophage (CFU-GM) were detected.
Our results indicate that 5% UCB -PL can be used as a supplement in MNC cultured cells and in cord blood hematopoietic stem cells for cell therapy purposes.