Spatial control of adult stem cell fate using nanotopographic cues

Eun Hyun Ahn, Younghoon Kim, Kshitiz, Steven S. An, Junaid Afzal, Suengwon Lee, Moonkyu Kwak, Kahp Yang Suh, Deok Ho Kim, Andre Levchenko

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

Adult stem cells hold great promise as a source of diverse terminally differentiated cell types for tissue engineering applications. However, due to the complexity of chemical and mechanical cues specifying differentiation outcomes, development of arbitrarily complex geometric and structural arrangements of cells, adopting multiple fates from the same initial stem cell population, has been difficult. Here, we show that the topography of the cell adhesion substratum can be an instructive cue to adult stem cells and topographical variations can strongly bias the differentiation outcome of the cells towards adipocyte or osteocyte fates. Switches in cell fate decision from adipogenic to osteogenic lineages were accompanied by changes in cytoskeletal stiffness, spanning a considerable range in the cell softness/rigidity spectrum. Our findings suggest that human mesenchymal stem cells (hMSC) can respond to the varying density of nanotopographical cues by regulating their internal cytoskeletal network and use these mechanical changes to guide them toward making cell fate decisions. We used this finding to design a complex two-dimensional pattern of co-localized cells preferentially adopting two alternative fates, thus paving the road for designing and building more complex tissue constructs with diverse biomedical applications.

Original languageEnglish (US)
Pages (from-to)2401-2410
Number of pages10
JournalBiomaterials
Volume35
Issue number8
DOIs
StatePublished - Mar 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

Keywords

  • Adipogenesis
  • Capillary force lithography
  • Differentiation
  • Human mesenchymal stem cells
  • Nanotopography
  • Osteogenesis

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