Dilara DALKİRAN, BEREN KARAOSMANOĞLU, Ekim Z. TASKİRAN

The Effect of Erythropoietin Treatment on Gene Expression Profile of Mesenchymal Stem Cells

Introduction: Mesenchymal Stem Cells are one of the most important elements of bone marrow microenvironment, which has a role in stromal support and stem cell differentiation. Exosomes are small vesicles that responsible from various cellular roles such as cell-cell communication and cell signaling, which may affect nearby and distant cells/tissues. Mesenchymal Stem Cells have therapeutic importance because of their multipotency and immune modulation potentials also with their exosomes. Erythropoietin, produced by liver hepatocytes, is responsible for erythroid differenti-ation (erythropoiesis) in bone marrow. In addition, Erythropoietin treatment of sev-eral cell types including Mesenchymal Stem Cells, showed therapeutic effects in var-ious diseases. Objective: The aim of this study is to examine the effect of erythropoietin on bone marrow Mesenchymal Stem Cells transcriptome and exosome derived miRNA profile. Materials and Methods: Effect of 3 different doses of Erythropoietin (1 IU/ml, 10 IU/ml and 100 IU/ml) for 48 hours on Mesenchymal Stem Cells transcriptome profile was analyzed. The results illustrated that 10 IU/ml Erythropoietin treatment has the most effective concentration in terms of gene expression profile. Therefore, small RNA libraries targeting miRNA was analyzed with 10 IU/ml Erythropoietin treated versus non treated groups with next generation sequencing. Results: We found that Erythropoietin treatment slightly changed global gene ex-pression profile. On the other hand, it was observed that Erythropoietin treated Mesenchymal Stem Cells have different exosomal miRNA profile. Conclusion: Differentially expressed exosomal miRNAs may have therapeutic effects in different conditions. It will be important to perform further studies with in vitro models, mimicking different physiological conditions and diseases for Mesenchymal Stem Cells and exosome biology.

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