Persistent cellular motion control and trapping using mechanotactic signaling.

Area of Science:

• Cell Biology
• Biophysics
• Tissue Engineering

Background:

• Chemotactic signaling and cell migration are crucial for cellular aggregation.
• Mechanotactic signaling, though less studied, offers unique control over cell motility.
• Mimicking mechanotactic signals could enable targeted cell delivery for in vitro tissue growth.

Purpose of the Study:

• To investigate the potential of mechanotactic signaling for precise control of cell migration.
• To explore the feasibility of using mechanical cues to direct cell movement for applications in tissue engineering.
• To achieve controlled cell trapping using mechanical stimuli.

Main Methods:

• Utilized optimal extracellular calcium levels ([Ca(2+)]ext = 3 mM).
• Applied controllable, low-magnitude fluid shear stress (σ < 0.5 Pa).
• Employed rapid flow direction reversal (within one second) to stimulate Dictyostelium discoideum.

Main Results:

• Successfully triggered directed migratory responses in amoebae with high control and precision.
• Determined mechanical input signals for predetermined movement sequences, including motion, reversal, and trapping.
• Achieved mechanotactic cell trapping for the first time, with a stalling frequency of 0.06–0.1 Hz for reversing stimuli.

Conclusions:

• Mechanotactic signaling provides a novel and precise method for controlling cell migration.
• Cellular trapping via mechanotaxis is achievable and comparable to chemotactic trapping.
• The internal motility apparatus may limit the speed of cellular responses to mechanical cues.