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Understanding the Immunological Mechanisms of Mesenchymal Stem Cells in Allogeneic Transplantation: From the Aspect of Major Histocompatibility Complex Class I

Yafei Wang,Mengya Tian,Fei Wang,B. Heng,Jing Zhou,Zhijian Cai,Hua Liu

Published 2019 in Stem Cells and Development

ABSTRACT

Mesenchymal stem cell (MSC) transplantation therapy appears to be an ideal strategy for repairing structural defects and restoring the functions of diseased tissues and organs. Additionally, MSCs are also used as immunosuppressants in allogeneic organ transplantation. However, owing to their inherent immunogenicity, MSC transplantation can induce the activation of an immune response, which can lead to the death and clearance of the transplanted MSCs. Major histocompatibility complex (MHC) molecules are responsible for antigen presentation, help T lymphocytes to recognize endogenous/extrinsic antigens, and trigger immune activation. Many studies have shown that MHC molecules (particularly class I) play key roles in the immunogenicity of MSCs. This review, therefore, focuses on the relationship between MHC-I surface expression on MSCs and its immunogenicity, as well as potential strategies to overcome the hurdle of MHC incompatibility.

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