Multipotent bone marrow-derived mesenchymal stem/stromal cells (BMSCs) exhibit a finite life span after ex vivo expansion leading to cellular senescence. Many factors can contribute to this. Recently, our group has identified for the first time expression of the chemokine-like factor superfamily 8 (CMTM8) gene in cultured human BMSCs. In this study, we examine the role of CMTM8 in BMSC proliferation, migration, and differentiation. Functional studies using siRNA-mediated knockdown of CMTM8 in human BMSCs resulted in decreased capacity to undergo proliferation and migration and an increased capacity for osteogenic differentiation in vitro. Furthermore, reduced CMTM8 levels led to a decrease in the epidermal growth factor receptor (EGFR) signaling pathway during BMSC proliferation and migration, respectively. Supportive studies using retroviral mediated enforced expression of CMTM8 in BMSC resulted in an increased capacity for proliferation and migration but a decreased osteogenic differentiation potential. Collectively, these data suggest that CMTM8 promotes BMSC proliferation and BMSC migration through the EGFR/ERK1/2 pathway. This study provides insight into novel regulatory mechanisms of human BMSC growth and cell fate determination.
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