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Hatani, Takeshi; Funakoshi, Shunsuke; Deerinck, Thomas J.; Bushong, Eric A.; Kimura, Takeshi; Takeshima, Hiroshi; Ellisman, Mark H.; Hoshijima, Masahiko; Yoshida, Yoshinori
Biochemical and biophysical research communications, 11/2018, Volume: 505, Issue: 4Journal Article
Many studies have shown the feasibility of in vivo cardiac transplantation of human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) in animal experiments. However, nano-structural confirmation of the successful incorporation of the engrafted iPSC-CMs including electron microscopy (EM) has not been accomplished, partly because identification of graft cells in EM has proven to be difficult. Using APEX2, an engineered ascorbate peroxidase imaging tag, we successfully localized and analyzed the fine structure of sarcomeres and the excitation contraction machinery of iPSC-CMs 6 months after their engraftment in infarcted mouse hearts. APEX2 made iPSC-CMs visible in multiple imaging modalities including light microscopy, X-ray microscopic tomography, transmission EM, and scanning EM. EM tomography allowed assessment of the differentiation state of APEX2-positive iPSC-CMs and analysis of the fine structure of the sarcomeres including T-tubules and dyads.
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