Abstract:
:Transplantation of cardiomyocytes derived from induced pluripotent stem cell (iPSC-CMs) is a promising approach for increasing functional CMs during end-stage heart failure. Although major histocompatibility complex (MHC) class I matching between donor cells and recipient could reduce acquired immune rejection, innate immune responses may have negative effects on transplanted iPSC-CMs. Here, we demonstrated that natural killer cells (NKCs) infiltrated in iPSC-CM transplants even in a syngeneic mouse model. The depletion of NKCs using an anti-NKC antibody rescued transplanted iPSC-CMs, suggesting that iPSC-CMs activated NKC-mediated innate immunity. Surprisingly, iPSC-CMs lost inhibitory MHCs but not activating ligands for NKCs. Re-expression of MHC class I induced by IFN-γ as well as suppression of activating ligands by an antibody rescued the transplanted iPSC-CMs. Thus, NKCs impede the engraftment of transplanted iPSC-CMs because of lost MHC class I, and our results provide a basis for an approach to improve iPSC-CM engraftment.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Nakamura Y,Miyagawa S,Yoshida S,Sasawatari S,Toyofuku T,Toda K,Sawa Ydoi
10.1038/s41598-019-47134-3subject
Has Abstractpub_date
2019-07-25 00:00:00pages
10840issue
1issn
2045-2322pii
10.1038/s41598-019-47134-3journal_volume
9pub_type
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