PLoS ONE (Jan 2011)

Mitotic spindle orients perpendicular to the forces imposed by dynamic shear.

  • Pablo Fernandez,
  • Matthias Maier,
  • Martina Lindauer,
  • Christian Kuffer,
  • Zuzana Storchova,
  • Andreas R Bausch

DOI
https://doi.org/10.1371/journal.pone.0028965
Journal volume & issue
Vol. 6, no. 12
p. e28965

Abstract

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Orientation of the division axis can determine cell fate in the presence of morphogenetic gradients. Understanding how mitotic cells integrate directional cues is therefore an important question in embryogenesis. Here, we investigate the effect of dynamic shear forces on confined mitotic cells. We found that human epithelial cells (hTERT-RPE1) as well as MC3T3 osteoblasts align their mitotic spindle perpendicular to the external force. Spindle orientation appears to be a consequence of cell elongation along the zero-force direction in response to the dynamic shear. This process is a nonlinear response to the strain amplitude, requires actomyosin activity and correlates with redistribution of myosin II. Mechanosteered cells divide normally, suggesting that this mechanism is compatible with biological functions.