The effects of actin cytoskeleton perturbation on keratin intermediate filament formation in mesenChymal stem/stromal cells

Tzu-Hao Chang, Hsien-Da Huang, Wei-Kee Ong, Yun-Ju Fu, Oscar Kuang Sheng Lee, Shu Chien, Jennifer H. Ho

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

F-actin plays a crucial role in composing the three-dimensional cytoskeleton and F-actin depolymerization alters fate choice of mesenchymal stem/stromal cells (MSCs). Here, we investigated differential gene expression and subsequent physiological changes in response to F-actin perturbation by latrunculin B in MSCs. Nineteen genes were down-regulated and 27 genes were up-regulated in the first 15 min after F-actin depolymerization. Functional enrichment analysis revealed that five genes involved in keratin (KRT) intermediate filaments clustering in the chromosome 17q21.2 region, i.e., KRT14, KRT19, KRT34, KRT-associated protein (KRTAP) 1-5, and KRTAP2-3, were strongly up-regulated. Transcription factor prediction identified NKX2.5 as the potential transcription factor to control KRT19, KRT34, KRTAP1-5, and KRTAP2-3; and indeed, the protein level of NKX2.5 was markedly increased in the nuclear fraction within 15 min of F-actin depolymerization. The peak of keratin intermediate filament formation was 1 h after actin perturbation, and the morphological changes showed by decrease in the ratio of long-axis to shortaxis diameter in MSCs was observed after 4 h. Together, F-actin depolymerization rapidly triggers keratin intermediate filament formation by turning on keratin-related genes on chromosome 17q21.2. Such findings offer new insight in lineage commitment of MSCs and further scaffold design in MSC-based tissue engineering. (C) 2014 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)3934-3944
Number of pages11
JournalBiomaterials
Volume35
Issue number13
DOIs
StatePublished - Apr 2014

Keywords

  • Chromosome 17q21.2; F-actin depolymerization; Intermediate filaments; Keratin; Mesenchymal stem cells (MSCs); NK2 homeobox 5 (NK2.5)

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