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Mechanical forces regulate stem cell response to surface topography.

Laura Saldaña1, Lara Crespo, Fátima Bensiamar

  • 1Unidad de Investigación, Hospital Universitario La Paz-IdiPAZ, Paseo de la Castellana 261, 28046 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain.

Journal of Biomedical Materials Research. Part A
|April 25, 2013
PubMed
Summary

Mechanical forces influence human mesenchymal stem cell (hMSC) behavior on orthopedic implant surfaces. Surface roughness and applied forces impact cell signaling, viability, and osteoblastic maturation, with FAK mechanotransduction being crucial for hMSC function.

Keywords:
bonemechanical stretchmesenchymal stem cellsmetalssurface roughness

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Orthopedic Engineering

Background:

  • Bone-implant interface mechanics are critical for orthopedic success.
  • The interplay of surface topography, mechanical forces, and cell behavior is complex.
  • Understanding human mesenchymal stem cell (hMSC) responses to mechanical stimuli on implant surfaces is vital.

Purpose of the Study:

  • To investigate the influence of mechanical stretch on hMSCs cultured on metallic substrates with varying roughness.
  • To elucidate the role of surface topography in mediating cellular responses to mechanical forces.
  • To explore the underlying mechanotransduction pathways involved in hMSC behavior on implant materials.

Main Methods:

  • hMSCs were cultured on smooth and rough stainless steel surfaces.
  • Controlled mechanical forces were applied to hMSCs using magnetic collagen-coated particles and an electromagnet.
  • Key cellular markers including p-FAK, PGE2, VEGF, fibronectin, and osteoblastic differentiation markers were quantified.

Main Results:

  • Rough surfaces increased p-FAK, PGE2, and VEGF under static conditions, but decreased cell viability and fibronectin.
  • Mechanical stimulation increased PGE2 and OPG/RANKL ratio on both surfaces, more so on smooth ones.
  • FAK activation by mechanical forces was observed on rough surfaces but not smooth ones; mechanical forces reduced cell viability and osteoblastic maturation on smooth surfaces.

Conclusions:

  • Surface topography significantly modulates hMSC response to mechanical forces.
  • FAK-mediated mechanotransduction is essential for hMSC growth and function on metallic implant surfaces.
  • These findings provide insights into optimizing orthopedic implant design for enhanced osseointegration.