Doxorubicin is a well-established and highly effective chemotherapy drug commonly used to treat multiple cancers such as lymphoma, leukemia, ovary, lung, and breast cancer, but its use is limited by cardiotoxicity. Cardiotoxicity can range from asymptomatic reduction in left ventricular ejection fraction to highly symptomatic heart failure (Class III to IV). Acute doxorubicin-induced cardiotoxicity (DIC) occurs in ~11% of patients and long-term cardiotoxic side effects, which can manifest up to 10 years after treatment, are observed in up to 36% of patients. Currently, we cannot predict which patients will develop cardiotoxicity. A major hurdle in filling the significant gaps in our knowledge about the mechanisms of DIC and how best to prevent it is the lack of good human models, due to the inaccessibility of patient-specific human cardiomyocyte samples, and the difficulty in isolating and maintaining human cardiomyocytes in vitro. Animal models are limited by significant functional disparities between animal and human cardiomyocytes. This hurdle has now been overcome by the recent advances in the generation of human induced pluripotent stem cells (iPSCs), in which a patient's somatic cells can be reprogrammed to pluripotency and maintained indefinitely in vitro. These iPSCs can then be efficiently differentiated into iPSC-derived cardiomyocytes (iPSC-CMs) and further studied in detail. In our preliminary studies, we have developed and validated a set of tools for assessing DIC in human iPSC-CMs. We have established that iPSC-CMs, derived from patients who have developed DIC, accurately recapitulate the susceptibility phenotype in vitro. Single nucleotide polymorphism (SNP) studies have identified several SNPs that are predicted to be highly associated with DIC (P=10-9 to 10-5). Hence in Aim 1, we will generate iPSC lines from 100 cancer patients treated with doxorubicin, 50 of whom experienced cardiotoxicity and 50 did not.
In Aim 2, we will use the assays established in our pilot studies to assess the susceptibility to DIC and perform RNA-seq and eQTL mapping to discover novel SNPs.
In Aim 3, we will introduce a very well established DIC-related SNP into five control iPSC lines using transcription activator-like effector nucleases (TALENs) and assess the effect on DIC susceptibility. Hence the overall aim of this R01 proposal is to use patient-specific iPSC-CMs to help elucidate the molecular mechanisms of DIC.
Doxorubicin is a highly effective chemotherapy drug. However, the use of doxorubicin is complicated by its well-established cardiotoxic side effects, and thus far it has been difficult to predict which patients will be adversely affected. In this proposal, we will investigate the application of patient-specific induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) to discover genetic markers of doxorubicin-induced cardiotoxicity (DIC) and to establish the molecular mechanisms by which they alter the risk of this complication. This knowledge should be of significant value in the prediction of DIC. In addition, the use of patient-specific iPSC-CM platform may be useful for developing means of DIC prevention in the future.
|Churko, Jared M; Garg, Priyanka; Treutlein, Barbara et al. (2018) Defining human cardiac transcription factor hierarchies using integrated single-cell heterogeneity analysis. Nat Commun 9:4906|
|Chang, Alex C Y; Chang, Andrew C H; Kirillova, Anna et al. (2018) Telomere shortening is a hallmark of genetic cardiomyopathies. Proc Natl Acad Sci U S A 115:9276-9281|
|Zhang, Joe Z; Guo, Hongchao; Wu, Joseph C (2018) Applications of genetically engineered human pluripotent stem cell reporters in cardiac stem cell biology. Curr Opin Biotechnol 52:66-73|
|Ong, Sang-Ging; Lee, Won Hee; Zhou, Yang et al. (2018) Mining Exosomal MicroRNAs from Human-Induced Pluripotent Stem Cells-Derived Cardiomyocytes for Cardiac Regeneration. Methods Mol Biol 1733:127-136|
|Paik, David T; Tian, Lei; Lee, Jaecheol et al. (2018) Large-Scale Single-Cell RNA-Seq Reveals Molecular Signatures of Heterogeneous Populations of Human Induced Pluripotent Stem Cell-Derived Endothelial Cells. Circ Res 123:443-450|
|Liu, Chun; Oikonomopoulos, Angelos; Sayed, Nazish et al. (2018) Modeling human diseases with induced pluripotent stem cells: from 2D to 3D and beyond. Development 145:|
|Zhao, Ming-Tao; Shao, Ning-Yi; Hu, Shijun et al. (2017) Cell Type-Specific Chromatin Signatures Underline Regulatory DNA Elements in Human Induced Pluripotent Stem Cells and Somatic Cells. Circ Res 121:1237-1250|
|Zhao, Ming-Tao; Chen, Haodong; Liu, Qing et al. (2017) Molecular and functional resemblance of differentiated cells derived from isogenic human iPSCs and SCNT-derived ESCs. Proc Natl Acad Sci U S A 114:E11111-E11120|
|Lee, Won Hee; Chen, Wen-Yi; Shao, Ning-Yi et al. (2017) Comparison of Non-Coding RNAs in Exosomes and Functional Efficacy of Human Embryonic Stem Cell- versus Induced Pluripotent Stem Cell-Derived Cardiomyocytes. Stem Cells 35:2138-2149|
|Karakikes, Ioannis; Termglinchan, Vittavat; Cepeda, Diana A et al. (2017) A Comprehensive TALEN-Based Knockout Library for Generating Human-Induced Pluripotent Stem Cell-Based Models for Cardiovascular Diseases. Circ Res 120:1561-1571|
Showing the most recent 10 out of 36 publications