Assessing embryonic stem cell response to surface chemistry using plasma polymer gradients

Frances Harding, Lauren Clements, Rob Short, Helmut Thissen, Nicolas Voelcker

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)

    Abstract

    The control of cell-material interactions is the key to a broad range of biomedical interactions. Gradient surfaces have recently been established as tools allowing the high-throughput screening and optimization of these interactions. In this paper, we show that plasma polymer gradients can reveal the subtle influence of surface chemistry on embryonic stem cell behavior and probe the mechanisms by which this occurs. Lateral gradients of surface chemistry were generated by plasma polymerization of diethylene glycol dimethyl ether on top of a substrate coated with an acrylic acid plasma polymer using a tilted slide as a mask. Gradient surfaces were characterized by X-ray photoelectron spectroscopy, infrared microscopy mapping and profilometry. By changing the plasma polymerization time, the gradient profile could be easily manipulated. To demonstrate the utility of these surfaces for the screening of cell-material interactions, we studied the response of mouse embryonic stem (ES) cells to these gradients and compared the performance of different plasma polymerization times during gradient fabrication. We observed a strong correlation between surface chemistry and cell attachment, colony size and retention of stem cell markers. Cell adhesion and colony formation showed striking differences on gradients with different plasma polymer deposition times. Deposition time influenced the depth of the plasma film deposited and the relative position of surface functional group density on the substrate, but not the range of plasma-generated species.

    Original languageEnglish
    Pages (from-to)1739-1748
    Number of pages10
    JournalActa Biomaterialia
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - May 2012

    Keywords

    • Gradient
    • High throughput screening
    • Plasma polymer
    • Stem cell

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