Project description:To understand the role of MEF2A in iPSC-CMs maturation, we used MEF2A-siRNA to reduce MEF2A transcription in iPSC-CMs and then examined the changes in transcription levels
Project description:We used human iPSC-CMs generated from healthy individuals and performed RNA-sequencing after 7 days of trastuzumab treatment to examine the mechanism associated with contraction dysfunction in iPSC-CMs after trastuzumab treatment. Transcriptome analysis revealed the key role of an altered energy metabolism pathway for cardiomyocytes in the disease pathogenesis.
Project description:Many oncology drugs have been found to induce cardiotoxicity in a subset of patients, which significantly limits their clinical use and impedes the benefit of lifesaving anti-cancer treatments. Human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) carry donor-specific genetic information and have been proposed for explore the inter-individual difference in oncology drug-induced cardiotoxicity. Herein, we evaluated the inter- and intra- individual variability of iPSC-CM-related assays and presented a practical approach for using donor-specific iPSC-CMs to predict personalized doxorubicin (DOX)-induced cardiotoxicity (DIC) prior to chemotherapy. Our findings demonstrated that donor-specific iPSC-CMs exhibited greater line-to-line variability than the intra-individual variability in impedance cytotoxicity and transcriptome assays. The variable and dose-dependent cytotoxic responses of iPSC-CMs resembled those observed in clinical practice, and largely replicated the reported mechanisms of DIC. By categorizing iPSC-CMs into DOX-resistant and DOX-sensitive cell lines based on their phenotypic reactions to DOX, we found that the sensitivity of donor-specific iPSC-CMs to DOX may predict in vivo DIC risk. Furthermore, we assessed the limitations of the model for identification of potential genetic/molecular biomarker and pinpointed a differentially expressed gene, DND microRNA-mediated repression inhibitor 1 (DND1), between the DOX-resistant and DOX-sensitive iPSC-CMs. We also discussed the selection of DOX dose and exposure duration for inter-individual variability of DIC assessment. Our results support the utility of donor-specific iPSC-CMs in assessing inter-individual difference and enabling personalized cardiotoxicity prediction. Further studies will encompass a large panel of donor-specific iPSC-CMs to investigate the role of the DND1 and known DIC genetic variants, and to identify potential novel molecular and genetic biomarkers for predicting DOX and other oncology drug-induced cardiotoxicity.
Project description:Statins prevent cardiovascular disease via their salutary function as inhibitors of cholesterol biosynthesis and mediators of pleiotropic effects on the cardiovascular system. The current study focuses on the class effect of statins on the transcriptome of human iPSC-derived cardiomyocytes (iPSC-CMs), applied at serum peak concentrations. We report a comprehensive transcriptomic analysis of iPSC-CMs derived from four healthy donors and different differentiation batches following treatment with fluvastatin, simvastatin, atorvastatin, and lovastatin. Our data display dynamic transcriptional networks and reveal a statin-induced molecular signature in iPSC-CMs independent of genetic background and technical variability. Finally, in-depth pathway enrichment analysis uncovers that all statins affect mainly metabolic properties of iPSC-CMs and particularly the regulation of cholesterol biosynthesis and fatty acid metabolism. Our study provides a global insight into the cardiomyocyte effects of statins revealing novel aspects of their role on cardiomyocyte metabolic regulation, when applied at clinically relevant concentrations.
Project description:Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) hold tremendous promise for in vitro modeling to assess native myocardial function and disease mechanisms as well as testing drug safety and efficacy. However, current iPSC-CMs are functionally immature, resembling in vivo CMs of fetal or neonatal developmental states. The use of targeted culture media and organoid formats have been identified as potential high-yield contributors to improve CM maturation. This study presents a novel iPSC-CM maturation medium formulation, designed using a differential evolutionary approach with oxidative capacity as an objective metric for iterative optimization. Relative to gold-standard reference formulations, our approach significantly matured morphology, Ca2+ handling, electrophysiology, and metabolism, which was further validated by multi-omic screening, for cells in either pure or co-cultured microtissue formats. Together, these findings not only provide a reliable workflow for highly functional iPSC-CMs for downstream use, but also demonstrate the power of high-dimensional optimization processes in evoking advanced biological function in vitro.
Project description:We used human iPSC-CMs generated from healthy individuals and performed RNA-sequencing after 5 days of trastuzumab treatment to examine the mechanism associated with cardiac dysfunction in iPSC-CMs after iron treatment. Transcriptome analysis revealed broad changes in cardiovascular development and processes.
Project description:Tandem Mass Tag-Based proteomic analysis was performed to detect protein expression changes between gene correction and LMNA mutation iPSC-CMs