Mechanical Interaction between Cells Facilitates Molecular Transport.

Area of Science:

• Cell Biology
• Biophysics
• Biochemistry

Background:

• Eukaryotic cells exist within an extracellular matrix (ECM), a fibrous environment crucial for growth and development.
• The ECM's anisotropic structure influences the diffusion of nanoscale molecules and biochemical signals.
• Cellular mechanical interactions remodel the ECM, potentially linking biomechanical and biochemical cell communication.

Purpose of the Study:

• To investigate how cell-induced forces on the ECM affect biochemical transport between distant cells.
• To explore the impact of ECM remodeling on the speed and efficiency of molecular communication.

Main Methods:

• Experimental observation of ECM remodeling by cells, noting increased fiber alignment and density.
• Random walk simulations on a 3D lattice with obstacles mimicking fibrous ECM structures.
• Measurement of tracer molecule diffusion and mean first-passage time for secreted molecules.

Main Results:

• Cell-induced ECM remodeling significantly accelerates the transport of molecules between cells.
• Increased fiber alignment and matrix density reduce transport dimensionality from 3D to 1D.
• This dimensional reduction leads to a much faster molecular transport process.

Conclusions:

• Cellular remodeling of the ECM provides a novel mechanism for regulating long-range cell-cell communication.
• A mechano-biochemical feedback loop is suggested, where mechanical forces influence biochemical signaling.
• ECM structure plays a critical role in the efficiency of intercellular communication.