Thyroid Hormone effects on hiPSC-derived cardiomyocytes (hiPSC-CM). Identification of target genes and pathways by RNA-Seq analysis
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE172348 | GEO | 2021/12/08
REPOSITORIES: GEO
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Project description:Abnormalities of ventricular action potential (AP) cause malignant cardiac arrhythmias and sudden cardiac death. Here, we sought to identify microRNAs (miRNAs) that regulate the human cardiac AP and asked whether their manipulation allows for therapeutic modulation of AP abnormalities. Quantitative analysis of the miRNA targetomes in human cardiac myocytes identified miR-365 as a primary miRNA to regulate repolarizing ion channels. AP recordings in patient-specific induced pluripotent stem cell-derived cardiac myocytes (iPSC-CMs) showed that elevation of miR-365 level significantly prolonged AP duration in hiPSC-CMs derived from a Short-QT syndrome (SQTS) patient, whereas specific inhibition of miR-365 normalized pathologically prolonged AP in Long-QT syndrome (LQTS) iPSC-CMs. Transcriptome analyses in human iPSC-CMs at bulk and single-cell level corroborated the key cardiac repolarizing channels as direct targets of miR-365, together with functionally synergistic regulation of additional AP-regulating genes by this miRNA. Whole-cell patch clamp experiments revealed miR-365-based regulation of repolarizing ionic currents. Finally, refractory period measurements in human myocardial slices substantiated the prolonging effect of miR-365 on AP duration also in adult human myocardial tissue. Our results delineate miR-365 to regulate human cardiac AP duration by targeting key factors of cardiac repolarization.
2021-12-01 | GSE185687 | GEO
Project description:Abnormalities of ventricular action potential (AP) cause malignant cardiac arrhythmias and sudden cardiac death. Here, we sought to identify microRNAs (miRNAs) that regulate the human cardiac AP and asked whether their manipulation allows for therapeutic modulation of AP abnormalities. Quantitative analysis of the miRNA targetomes in human cardiac myocytes identified miR-365 as a primary miRNA to regulate repolarizing ion channels. AP recordings in patient-specific induced pluripotent stem cell-derived cardiac myocytes (iPSC-CMs) showed that elevation of miR-365 level significantly prolonged AP duration in hiPSC-CMs derived from a Short-QT syndrome (SQTS) patient, whereas specific inhibition of miR-365 normalized pathologically prolonged AP in Long-QT syndrome (LQTS) iPSC-CMs. Transcriptome analyses in human iPSC-CMs at bulk and single-cell level corroborated the key cardiac repolarizing channels as direct targets of miR-365, together with functionally synergistic regulation of additional AP-regulating genes by this miRNA. Whole-cell patch clamp experiments revealed miR-365-based regulation of repolarizing ionic currents. Finally, refractory period measurements in human myocardial slices substantiated the prolonging effect of miR-365 on AP duration also in adult human myocardial tissue. Our results delineate miR-365 to regulate human cardiac AP duration by targeting key factors of cardiac repolarization.
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Project description:Energy metabolism is a key aspect of cardiomyocyte biology. Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM) are a promising tool for biomedical application, but they are immature and have not undergone metabolic shift related to early postnatal development. Cultivation of hiPSC-CM in 3D engineered heart tissue (EHT) format leads to morphological maturation. This study compared the mitochondrial and metabolic state of hiPSC-CM in standard 2D culture and the EHT format and determined the influence of contractile activity. HiPSC-CM in EHTs showed ~2-fold higher number of mitochondria (electron microscopy), mitochondrial mass (mitotracker), DNA (Mt-ND1, Mt-ND2), and protein abundance (proteome) than in 2D culture. While hiPSC-CM exhibited the principal ability to use glucose, lactate and fatty acids as energy substrates irrespective of culture format, hiPSC-CM in 3D performed more oxidation of glucose, lactate and fatty acid, and less anaerobic glycolysis. The increase in mitochondrial mass and DNA in 3D was diminished by pharmacological inhibition of contractile force, suggesting that contractile work participates in mitochondrial development hiPSC-CM. In conclusion, contractile work in the EHT format contributes to metabolic maturation of hiPSC-CM.
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Project description:Prolonged electrocardiographic indices reflecting myocardial impulse conduction and repolarization are risk factors for sudden cardiac death and drug-induced arrhythmia. The PR-interval, QRS-duration and QT-interval are heritable traits influenced by multiple genetic and environmental factors. The genetic underpinnings of these traits are still largely unknown. In this study, we leveraged the variability in cardiac gene expression and the variation in PR-, QRS- and QT-intervals among F2 mice harboring the cardiac sodium ion-channel mutation Scn5a-1798insD/+ derived from the 129P2-Scn5a1798insD/+ and FVB/NJ-Scn5a1798insD/+ cross, to isolate novel genes and biological pathways impacting on cardiac conduction and repolarization. Cardiac left-ventricle total RNA from 120 F2-(129P2xFVBN/J)-Scn5a-1798insD/+ mice at 12 to 14 weeks old.
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Project description:Extracellular Vesicles (EV) are an attractive therapy to boost cardiac regeneration. Nevertheless, identification of EV and corresponding cell platform(s) suitable for therapeutic application, is still a challenge. Here, we isolated EV from key stages of the human induced pluripotent stem cell-cardiomyocyte (hiPSC-CM) differentiation and maturation, i.e., from hiPSC (hiPSC-EV), cardiac progenitors (CPC-EV), immature (CMi-EV) and mature (CMm-EV) cardiomyocytes, with the aim of identifying a promising cell biofactory for EV production, and pinpoint the genetic signatures of bioactive EV. EV were characterized in terms of expression of specific markers, yield, and size. Bioactivity was assessed in human umbilical vein endothelial cells (HUVEC) and hiPSC-CM. Small RNA-Seq was performed to identify the differentially expressed miRNA in the four EV groups. Bioactivity assays showed increased tube formation and migration in HUVEC treated with hiPSC-EV compared to EV from committed cell populations. hiPSC-EV also significantly increased hiPSC-CM proliferation. Global miRNA expression profiles corroborated an EV-miRNA pattern indicative of stem cell to cardiomyocyte specification. A stemness maintenance miRNA cluster upregulated in hiPSC-EV was found to target the PTEN/PI3K/AKT pathway. Moreover, hiPSC-EV treatment mediated PTEN suppression and increased AKT phosphorylation. Overall, our findings validate hiPSC as suitable cell biofactories for EV production for cardiac regenerative applications.
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Project description:Prolonged electrocardiographic indices reflecting myocardial impulse conduction and repolarization are risk factors for sudden cardiac death and drug-induced arrhythmia. The PR-interval, QRS-duration and QT-interval are heritable traits influenced by multiple genetic and environmental factors. The genetic underpinnings of these traits are still largely unknown. In this study, we leveraged the variability in cardiac gene expression and the variation in PR-, QRS- and QT-intervals among F2 mice harboring the cardiac sodium ion-channel mutation Scn5a-1798insD/+ derived from the 129P2-Scn5a1798insD/+ and FVB/NJ-Scn5a1798insD/+ cross, to isolate novel genes and biological pathways impacting on cardiac conduction and repolarization.
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Project description:Abnormalities of ventricular action potential (AP) cause malignant cardiac arrhythmias and sudden cardiac death. Here, we sought to identify microRNAs (miRNAs) that regulate the human cardiac AP and asked whether their manipulation allows for therapeutic modulation of AP abnormalities. Quantitative analysis of the miRNA targetomes in human cardiac myocytes identified miR-365 as a primary miRNA to regulate repolarizing ion channels. AP recordings in patient-specific induced pluripotent stem cell-derived cardiac myocytes (iPSC-CMs) showed that elevation of miR-365 level significantly prolonged AP duration in hiPSC-CMs derived from a Short-QT syndrome (SQTS) patient, whereas specific inhibition of miR-365 normalized pathologically prolonged AP in Long-QT syndrome (LQTS) iPSC-CMs. Transcriptome analyses in human iPSC-CMs at bulk and single-cell level corroborated the key cardiac repolarizing channels as direct targets of miR-365, together with functionally synergistic regulation of additional AP-regulating genes by this miRNA. Whole-cell patch clamp experiments revealed miR-365-based regulation of repolarizing ionic currents. Finally, refractory period measurements in human myocardial slices substantiated the prolonging effect of miR-365 on AP duration also in adult human myocardial tissue. Our results delineate miR-365 to regulate human cardiac AP duration by targeting key factors of cardiac repolarization.
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Project description:Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are used to examine in vitro the effect of mutations in the cardiac sodium channel gene SCN5A, associated with cardiac arrhythmias. Postnatally SCN5A undergoes a fetal-to-adult isoform switch, but hiPSC-CMs in conventional 2-dimensional cultures are fetal-like. This impedes evaluation of mutations in the adult isoform. Here, we derived hiPSC-CMs from a patient carrying compound mutations in the adult SCN5A exon 6B and in exon 4 and generated isogenic corrected lines. In hiPSC-CM 2-dimensional culture, exon 6B mutation did not affect single-cell electrophysiology because of its limited expression. CRISPR/Cas9-mediated excision of the fetal exon 6A with did not promote adult SCN5A expression, rather it impaired the splicing. By maturing hiPSC-CMs in three-dimensional tri-cell type cardiac microtissues, SCN5A underwent isoform switch and revealed the functional effect of exon 6B mutation. Upregulation of the splicing factor MBNL1 in hiPSC-CMs either by culture in microtissues or by overexpression was sufficient to promote exon 6B inclusion. Our results support the ability to study developmentally regulated cardiac genes and postnatal cardiac arrhythmias using hiPSC cardiac cells.
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Project description:Drug-induced cardiac arrhythmia characterized by QT prolongation and torsade de pointes has been a major reason for drug withdrawal at the late stage of clinical trials. Current preclinical testing is still insufficient to identify drugs with pro-arrhythmic risks. Human induced pluripotent stem cell-derived cardiomyocytes are a promising development in safety screening as a reproducible human model. Using the patch-clamp technique, we showed that human induced pluripotent stem cell-derived cardiomyocytes exhibited spontaneous action potentials, which represent relatively immature forms of cardiac cells. Furthermore, in some spontaneously beating cells, a hERG blocker, E4031, depolarized membrane potentials and stopped spontaneous firing, resulting in failure to evaluate drug effects on electrophysiological parameters that reflect repolarization processes. Here we show that human stem cell-derived cardiomyocytes with transduced KCNJ2 encoding the inward-rectifier potassium channel have characteristics similar to mature cardiomyocytes including responsiveness to rate changes and potassium channel blockers. Our novel strategy could allow implementation of human induced pluripotent stem cell-derived cardiomyocytes in drug safety assessment for cardiac toxicity.
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