Immunogenicity of insulin producing cells differentiating from human umbilical cord mesenchymal stem cells / 中国组织工程研究

ABSTRACT

BACKGROUND: Human umbilical cord mesenchymal stem cells (hUC-MSCs) have low immunogenicity and it is unclear whether insulin producing cells (IPCs) that differentiate from hUC-MSCs have low immunogenicity. OBJECTIVE:To investigate the immunogenicity of IPCs differentiating from hUC-MSCs in vitro and after IPCs transplantation into the host. METHODS: (1) The hUC-MSCs were induced to differentiate into IPCs according to the modified scheme. Flow cytometry assay was used to detect the immunophenotype and apoptotic rate of IPCs in a cytotoxicity test. (2) Cell counting kit-8 was used to detect the proliferative capacity of human peripheral blood mononuclear cells in the one-way mixed lymphocyte assay. (3) The IPCs were then transplanted into the abdominal cavity and left renal capsule of mice, and then the infiltration of immune cells was detected by flow cytometry and immunohistochemistry. RESULTS AND CONCLUSION: The IPCs highly expressed HLA-ABC and lowly expressed HLA-DR, CD40 and CD80. The apoptosis rate of IPCs increased with the increase of pre-sensitized splenocytes in the cytotoxicity test. In the one-way mixed lymphocyte assay, IPCs inhibited the proliferation of human peripheral blood mononuclear cells when the target ratio was 101 and 501. After IPCs transplantation, the number of lymphocytes was increased in the transplanted site. In summary, our results show that IPCs that differentiate from hUC-MSCs maintain low immunogenicity in vitro,but have some immunogenicity after transplantation into the host due to microenvironment changes.