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Comparative proteomics of human embryonic stem cells and embryonal carcinoma cells
Author(s) -
Chaerkady Raghothama,
Kerr Candace L.,
Kandasamy Kumaran,
Marimuthu Arivusudar,
Gearhart John D.,
Pandey Akhilesh
Publication year - 2010
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.200900483
Subject(s) - biology , embryonic stem cell , microbiology and biotechnology , induced pluripotent stem cell , cellular differentiation , stem cell , p19 cell , embryoid body , biochemistry , gene
Abstract Pluripotent human embryonic stem cells (ESCs) can be differentiated in vitro into a variety of cells which hold promise for transplantation therapy. Human embryonal carcinoma cells (ECCs), stem cells of human teratocarcinomas, are considered a close but malignant counterpart to human ESCs. In this study, a comprehensive quantitative proteomic analysis of ESCs and ECCs was carried out using the iTRAQ method. Using two‐dimensional LC and MS/MS analyses, we identified and quantitated ∼1800 proteins. Among these are proteins associated with pluripotency and development as well as tight junction signaling and TGFβ receptor pathway. Nearly ∼200 proteins exhibit more than twofold difference in abundance between ESCs and ECCs. Examples of early developmental markers high in ESCs include β‐galactoside‐binding lectin, undifferentiated embryonic cell transcription factor‐1, DNA cytosine methyltransferase 3β isoform‐B, melanoma antigen family‐A4, and interferon‐induced transmembrane protein‐1. In contrast, CD99‐antigen ( CD99 ), growth differentiation factor‐3, cellular retinoic acid binding protein‐2, and developmental pluripotency associated‐4 were among the highly expressed proteins in ECCs. Several proteins that were highly expressed in ECCs such as heat shock 27 kDa protein‐1, mitogen‐activated protein kinase kinase‐1, nuclear factor of κ light polypeptide gene enhancer in B‐cells inhibitor like‐2, and S100 calcium‐binding protein‐A4 have also been attributed to malignancy in other systems. Importantly, immunocytochemistry was used to validate the proteomic analyses for a subset of the proteins. In summary, this is the first large‐scale quantitative proteomic study of human ESCs and ECCs, which provides critical information about the regulators of these two closely related, but developmentally distinct, stem cells.