The immunologic properties of bone morphogenic protein receptor IB positive subpopulation before and after osteogenic differentiation in mouse dermis

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Abstract

We have previously reported that human dermal bone morphogenic protein receptor (BMPR) IB positive subpopulation had a high osteogenic differentiation potential and may be a promising cell source for allogeneic bone tissue engineering. In this study, the immunologic properties of dermal BMPR-IB+ subpopulation before and after osteogenic differentiation were reported. The results confirmed that dermal BMPR-IB+ cells possessed a similar osteogenic differentiation potential with bone marrow mesenchymal stromal cells in a mouse model. Furthermore, the expression of immune rejection-related surface antigens such as major histocompatibility class II and co-stimulatory proteins (CD40, CD80, and CD86) were absent on dermal BMPRIB+ cells. Dermal BMPRIB+ cells elicited no proliferation of allogeneic splenocytes and suppressed the proliferation of stimulated immune cells. Interestingly, osteogenic differentiation in vitro had no adverse effect on the immunological features of these cells. Most importantly, inducible NO synthase (iNOS) was involved in immunoregulatory effects by undifferentiated BMPRIB+ fibroblasts, whereas indoleamine 2,3-dioxygenase (IDO) activity was related to mediating immunomodulatory function by osteogenic differentiated BMPRIB+ fibroblasts. In conclusion, dermal BMPRIB+ cells have a low immunogenicity and possess immunosuppressive capacity before and after osteogenic differentiation in vitro, which would facilitate the allotransplantation in the future. However, mechanisms mediating immunoregulatory property between undifferentiated and osteogenic differentiated BMPRIB+ fibroblasts may be different and need further investigation.

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He, J. G., Wang, T. L., Wang, T., Xu, H., Zhang, Y., & Dong, J. S. (2016). The immunologic properties of bone morphogenic protein receptor IB positive subpopulation before and after osteogenic differentiation in mouse dermis. PLoS ONE, 11(8). https://doi.org/10.1371/journal.pone.0161785

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