The effect of ultrasound stimulation on the cytoskeletal organization of chondrocytes seeded in three-dimensional matrices

Sandra Noriega, Gulnara Hasanova, Anuradha Subramanian

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The impact of low-intensity diffuse ultrasound (LIDUS) stimulation on the cytoskeletal organization of chondrocytes seeded in three-dimensional (3D) scaffolds was evaluated. Chondrocytes seeded on 3D chitosan matrices were exposed to LIDUS at 5.0 MHz (approx. 15 kPa, 51 s, 4 applications/day) in order to study the organization of actin, tubulin and vimentin. The results showed that actin presented a punctate cytosolic distribution and tubulin presented a quasiparallel organization of microtubules, whereas vimentin distribution was unaffected. Chondrocytes seeded on 3D scaffolds responded to US stimulation by the disruption of actin stress fibers and were sensitive to the presence of Rho-activated kinase (ROCK) inhibitor (Y27632). The gene expression of ROCK-I, a key element in the formation of stress fibers and mDia1, was significantly upregulated under the application of US. We conclude that the results of both the cytoskeletal analyses and gene expression support the argument that the presence of punctate actin upon US stimulation was accompanied by the upregulation of the RhoA/ROCK pathway.

Original languageEnglish (US)
Pages (from-to)14-26
Number of pages13
JournalCells Tissues Organs
Volume197
Issue number1
DOIs
StatePublished - Dec 1 2012

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Keywords

  • Actin cytoskeleton
  • Biomaterial
  • Cartilage research
  • Cartilage, articular
  • Cell-cell and cell-matrix interactions
  • Cytoskeleton
  • Cytoskeleton interaction
  • Tissue engineering, cartilage and bone

ASJC Scopus subject areas

  • Anatomy
  • Histology

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