Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM) hold great promise for regenerative medicine and in vitro screening. Despite displaying key cardiomyocyte phenotypic characteristics, they more closely resemble fetal/neonatal cardiomyocytes, and further characterization is necessary. By combining the use of tandem mass tags to label cell lysates, followed by multiplexing, we have determined the effects of short-term (30 day) in vitro culture on hiPSC-CM protein expression. We found that hiPSC-CM exhibit temporal changes in global protein expression; alterations in protein expression were pronounced during the first 2 weeks following thaw and dominated by reductions in proteins associated with protein synthesis and ubiquitination. Between 2 and 4 weeks, proceeding thaw alterations in protein expression were dominated by metabolic pathways, indicating a potential temporal metabolic shift from glycolysis toward oxidative phosphorylation. Time-dependent changes in proteins associated with cardiomyocyte contraction, excitation–contraction coupling, and metabolism were detected. While some were associated with expected functional outcomes in terms of morphology or electrophysiology, others such as metabolism did not produce the anticipated maturation of hiPSC-CM. In several cases, a predicted outcome was not clear because of the concerted changes in both stimulatory and inhibitory pathways. Nevertheless, clear development of hiPSC-CM over this time period was evident.
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