Frontiers in Cell and Developmental Biology (Sep 2020)

Impact of Sustained Transforming Growth Factor-β Receptor Inhibition on Chromatin Accessibility and Gene Expression in Cultured Human Endometrial MSC

  • Raffaella Lucciola,
  • Raffaella Lucciola,
  • Raffaella Lucciola,
  • Pavle Vrljicak,
  • Pavle Vrljicak,
  • Shanti Gurung,
  • Caitlin Filby,
  • Caitlin Filby,
  • Saeedeh Darzi,
  • Saeedeh Darzi,
  • Joanne Muter,
  • Joanne Muter,
  • Sascha Ott,
  • Sascha Ott,
  • Jan J. Brosens,
  • Jan J. Brosens,
  • Caroline E. Gargett,
  • Caroline E. Gargett

DOI
https://doi.org/10.3389/fcell.2020.567610
Journal volume & issue
Vol. 8

Abstract

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Endometrial mesenchymal stem cells (eMSC) drive the extraordinary regenerative capacity of the human endometrium. Clinical application of eMSC for therapeutic purposes is hampered by spontaneous differentiation and cellular senescence upon large-scale expansion in vitro. A83-01, a selective transforming growth factor-β receptor (TGFβ-R) inhibitor, promotes expansion of eMSC in culture by blocking differentiation and senescence, but the underlying mechanisms are incompletely understood. In this study, we combined RNA-seq and ATAC-seq to study the impact of sustained TGFβ-R inhibition on gene expression and chromatin architecture of eMSC. Treatment of primary eMSC with A83-01 for 5 weeks resulted in differential expression of 1,463 genes. Gene ontology analysis showed enrichment of genes implicated in cell growth whereas extracellular matrix genes and genes involved in cell fate commitment were downregulated. ATAC-seq analysis demonstrated that sustained TGFβ-R inhibition results in opening and closure of 3,555 and 2,412 chromatin loci, respectively. Motif analysis revealed marked enrichment of retinoic acid receptor (RAR) binding sites, which was paralleled by the induction of RARB, encoding retinoic acid receptor beta (RARβ). Selective RARβ inhibition attenuated proliferation and clonogenicity of A83-01 treated eMSC. Taken together, our study provides new insights into the gene networks and genome-wide chromatin changes that underpin maintenance of an undifferentiated phenotype of eMSC in prolonged culture.

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