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Switching behaviour in vascular smooth muscle cell-matrix adhesion during oscillatory loading.

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Mechanical forces affect cell adhesion through integrins. This study reveals how varying forces can switch smooth muscle cells between firm adhesion and detachment, offering insights into cell-matrix interactions.

Keywords:
BistabilityDynamic loadingIntegrinsMechanotransduction

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Area of Science:

  • Cellular mechanics
  • Biophysics
  • Biomaterials

Background:

  • Integrins mediate mechanotransduction between smooth muscle cells (SMCs) and the extracellular matrix (ECM).
  • SMCs in vessels and airways experience dynamic mechanical forces from physiological activities.
  • The impact of these forces on integrin dynamics and cell-matrix adhesion remains unclear.

Purpose of the Study:

  • To investigate integrin response to external oscillatory loading in live aortic SMCs.
  • To understand the effects of varying force amplitudes on cell-matrix adhesion dynamics.
  • To develop a mathematical model for simulating integrin-ECM interactions under mechanical stress.

Main Methods:

  • Atomic force microscopy (AFM) with a fibronectin-coated probe to apply cyclic indentation to SMCs.
  • Observation of adhesion states (firm adhesion vs. detachment) based on force-time courses.
  • Development of a mathematical model simulating cell-integrin-ECM as a spring system with local integrin binding dynamics.

Main Results:

  • AFM experiments showed a transition from firm adhesion to detachment with increasing oscillatory loading amplitude.
  • Switching behavior between adhesion states was observed in some SMCs at intermediate amplitudes.
  • The mathematical model reproduced two similar adhesion states and identified a bistability region.
  • Bistability in the model, driven by integrin cooperativity and cell deformation, explains experimental switching behavior.

Conclusions:

  • Bistability in integrin-mediated adhesion provides a potential mechanism for how transient mechanical stimuli can induce long-term changes in cell-matrix interactions.
  • This phenomenon may alter the cells' force transmission capabilities.
  • Further experiments are proposed to validate the physiological implications of bistability in SMC adhesion dynamics.