Comparative effect of human platelet derivatives on proliferation and osteogenic differentiation of menstrual blood-derived stem cells.

Menstrual blood has been recognized as an easily accessible and inexpensive source of stem cells, in recent years. To establish a safe and efficient protocol for development of menstrual blood-derived stem cells (MenSCs) into osteoblasts, the effect of substitution of fetal bovine serum (FBS) with human platelet derivatives (HPDs) was evaluated during proliferation and osteogenic differentiation of MenSCs. To this aim, parallel experiments were carried out on cultured MenSCs in the presence of platelet-rich plasma, platelet-poor plasma, platelet gel supernatant, or human platelet releasate (HPR), and compared with cells cultured in conventional growth medium containing FBS. There was no significant difference between growth curves of cultured MenSCs in presence of different fortified media. However, the MenSCs demonstrated variant differentiation patterns in response to FBS replacement with HPDs. Mineralization, as judged by Alizarin red staining, was significantly higher in cells differentiated in the presence of HPR compared to cells that were fortified with other medium supplements. A greater osteocalcin production level, alkaline phosphatase activity, and mRNA expression of osteogenic-specific genes in differentiated MenSCs under HPR condition further confirmed our previous findings. Based on our data, FBS substitution by HPDs not only allows for successful MenSCs proliferation, but also promotes MenSCs development into osteoblasts. The effectiveness of HPR on osteogenic differentiation of MenSCs represents an important novel step toward safe and applied stem cell therapy of bone diseases.