Elasticity boundary conditions required for cell mechanotaxis on microelastically-patterned gels

研究成果: Contribution to journalArticle査読

59 被引用数 (Scopus)

抄録

Directional cell migration induced by a mechanical gradient on a substrate surface toward a harder region, so-called mechanotaxis or durotaxis, has recently drawn attention not only in the field of mechanobiology but also for possible cell manipulation in biomedical engineering. Before we can use mechanotaxis to control cell migration on a biomaterial surface, quantitative design criteria for a microelasticity gradient should be established. To clarify the conditions required to induce mechanotaxis, the effects of a microelasticity boundary on cell culture hydrogels have been systematically assessed with regard to fibroblast migration based on a custom-built reduction projection-type photolithographic microelasticity patterning system with elasticity-tunable photocurable styrenated gelatins, which is a thoroughly-improved system of our previous simple photomasking method [41]. As a result, the conditions required to induce mechanotaxis were found to include a certain threshold jump in elasticity (30-40 kPa) and a sufficiently narrow width of the elasticity boundary (50 μm) comparable to a single cell's adhered area, i.e., a sufficiently high gradient strength (30-40 kPa/50 μm in our gelatinous gel system). A significant asymmetric distribution of the number and size of focal adhesions across the elasticity boundary was confirmed to be one of the driving factors of mechanotaxis by indirect immunofluorescence microscopy, and mechanistic considerations in the design criteria are discussed.

本文言語英語
ページ(範囲)2725-2733
ページ数9
ジャーナルBiomaterials
32
11
DOI
出版ステータス出版済み - 4 2011

All Science Journal Classification (ASJC) codes

  • バイオエンジニアリング
  • セラミックおよび複合材料
  • 生物理学
  • 生体材料
  • 材料力学

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