E2F1 Orchestrates Transcriptomics and Oxidative Metabolism in Wharton's Jelly-Derived Mesenchymal Stem Cells from Growth-Restricted Infants

PLoS One. 2016 Sep 15;11(9):e0163035. doi: 10.1371/journal.pone.0163035. eCollection 2016.

Abstract

Wharton's jelly-derived Mesenchymal Stem Cells (MSCs) isolated from newborns with intrauterine fetal growth restriction were previously shown to exert anabolic features including insulin hypersensitivity. Here, we extend these observations and demonstrate that MSCs from small for gestational age (SGA) individuals have decreased mitochondrial oxygen consumption rates. Comparing normally grown and SGA MSCs using next generation sequencing studies, we measured global transcriptomic and epigenetic profiles and identified E2F1 as an over-expressed transcription factor regulating oxidative metabolism in the SGA group. We further show that E2F1 regulates the differential transcriptome found in SGA derived MSCs and is associated with the activating histone marks H3K27ac and H3K4me3. One of the key genes regulated by E2F1 was found to be the fatty acid elongase ELOVL2, a gene involved in the endogenous synthesis of docosahexaenoic acid (DHA). Finally, we shed light on how the E2F1-ELOVL2 pathway may alter oxidative respiration in the SGA condition by contributing to the maintenance of cellular metabolic homeostasis.

MeSH terms

  • E2F1 Transcription Factor / metabolism*
  • Histones / metabolism
  • Humans
  • Infant, Newborn
  • Infant, Small for Gestational Age*
  • Mesenchymal Stem Cells / metabolism*
  • Mitochondria / metabolism
  • Oxidation-Reduction
  • Oxygen Consumption
  • Phenotype
  • Transcriptome*
  • Up-Regulation
  • Wharton Jelly / metabolism*

Substances

  • E2F1 Transcription Factor
  • E2F1 protein, human
  • Histones

Grants and funding

This research is supported by the Singapore National Research Foundation under its Translational and Clinical Research (TCR) Flagship Programme and administered by the Singapore Ministry of Health’s National Medical Research Council (NMRC; www.nmrc.gov.sg), Singapore- NMRC/TCR/004-NUS/2008; NMRC/TCR/012-NUHS/2014. SICS Investigators are supported through Agency for Science Technology and Research (A*STAR; www.a-star.edu.sg) funding. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.