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Rho kinase inhibitors stimulate the migration of human cultured osteoblastic cells by regulating actomyosin activity

Xuejiao Zhang1, Cheng Li, Huiling Gao

  • 1Department of Anatomy and Embryology, Ehime University Graduate School of Medicine, Ehime, Japan.

Cellular & Molecular Biology Letters
|March 12, 2011
PubMed

Insights

Rho-associated kinase (ROCK) inhibitors significantly boosted human osteoblast and osteosarcoma cell migration. This suggests ROCK inhibitors could improve bone prostheses biocompatibility by enhancing cell movement and cytoskeletal organization.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Orthopedics

Background:

  • Rho-associated kinase (ROCK) plays a role in cellular processes like migration and cytoskeletal organization.
  • Understanding ROCK's function in bone cells is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the effects of ROCK inhibition on the migration and cytoskeletal organization of primary human osteoblasts and Saos-2 osteosarcoma cells.
  • To evaluate the potential of ROCK inhibitors as anabolic agents for bone prostheses.

Main Methods:

  • Primary human osteoblasts and Saos-2 cells were treated with ROCK inhibitors (Y-27632 and HA-1077).
  • Cell migration was assessed using an improved motility assay.
  • Cytoskeletal organization was visualized using fluorescent imaging.
  • Western blotting was employed to analyze myosin light chain (MLC) phosphorylation.

Main Results:

  • ROCK inhibitors Y-27632 and HA-1077 significantly increased cell migration in a dose-dependent and reversible manner.
  • Inhibition of ROCK led to a stellate cell appearance with reduced stress fiber and focal contact assembly.
  • ROCK inhibitors rapidly decreased MLC phosphorylation without altering total MLC levels.

Conclusions:

  • ROCK inhibition enhances human osteoblast and osteosarcoma cell migration through actin cytoskeleton reorganization and myosin activity regulation.
  • ROCK inhibitors show potential as anabolic agents to improve the biocompatibility of bone and joint prostheses.

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