Proteomic Analysis of Human Pluripotent Stem Cell–Derived, Fetal, and Adult Ventricular Cardiomyocytes Reveals Pathways Crucial for Cardiac Metabolism and Maturation

Author:

Poon Ellen1,Keung Wendy1,Liang Yimin1,Ramalingam Rajkumar1,Yan Bin1,Zhang Shaohong1,Chopra Anant1,Moore Jennifer1,Herren Anthony1,Lieu Deborah K.1,Wong Hau San1,Weng Zhihui1,Wong On Tik1,Lam Yun Wah1,Tomaselli Gordon F.1,Chen Christopher1,Boheler Kenneth R.1,Li Ronald A.1

Affiliation:

1. From the Stem Cell and Regenerative Medicine Consortium (E.P., W.K., B.Y., Z.W., O.T. W., K.R.B., R.A.L.) and Department of Physiology, LKS Faculty of Medicine (E.P., W.K., B.Y., Z.W., O.T.W., K.R.B., R.A.L.), University of Hong Kong, Hong Kong, P.R. China; Departments of Biology and Chemistry (Y.M.L., R.R., Y.W.L.) and Computer Science (H.S.W.), City University of Hong Kong, Hong Kong, P.R. China; Department of Computer Science, Guangzhou University, Guangzhou, P.R. China (S.Z.); Department of...

Abstract

Background— Differentiation of pluripotent human embryonic stem cells (hESCs) to the cardiac lineage represents a potentially unlimited source of ventricular cardiomyocytes (VCMs), but hESC-VCMs are developmentally immature. Previous attempts to profile hESC-VCMs primarily relied on transcriptomic approaches, but the global proteome has not been examined. Furthermore, most hESC-CM studies focus on pathways important for cardiac differentiation, rather than regulatory mechanisms for CM maturation. We hypothesized that gene products and pathways crucial for maturation can be identified by comparing the proteomes of hESCs, hESC-derived VCMs, human fetal and human adult ventricular and atrial CMs. Methods and Results— Using two-dimensional–differential-in-gel electrophoresis, 121 differentially expressed (>1.5-fold; P <0.05) proteins were detected. The data set implicated a role of the peroxisome proliferator–activated receptor α signaling in cardiac maturation. Consistently, WY-14643, a peroxisome proliferator–activated receptor α agonist, increased fatty oxidative enzyme level, hyperpolarized mitochondrial membrane potential and induced a more organized morphology. Along this line, treatment with the thyroid hormone triiodothyronine increased the dynamic tension developed in engineered human ventricular cardiac microtissue by 3-fold, signifying their maturation. Conclusions— We conclude that the peroxisome proliferator–activated receptor α and thyroid hormone pathways modulate the metabolism and maturation of hESC-VCMs and their engineered tissue constructs. These results may lead to mechanism-based methods for deriving mature chamber-specific CMs.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Genetics(clinical),Cardiology and Cardiovascular Medicine,Genetics

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