Related Experiment Video
Updated: Jul 22, 2025
12:26
Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy
Published on: January 29, 2022
5.8K
Optimal cell traction forces in a generalized motor-clutch model.
Roberto Alonso-Matilla1, Paolo P Provenzano2, David J Odde3
1Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota; University of Minnesota Physical Sciences in Oncology Center, Minneapolis, Minnesota; University of Minnesota Center for Multiparametric Imaging of Tumor Immune Microenvironments, Minneapolis, Minnesota.
Biophysical Journal
|July 21, 2023
Summary
Cells use a "motor-clutch" system to sense stiffness and move. This study reveals optimal clutch properties for maximizing cell force transmission, guiding molecular tension sensor design and understanding cell migration.
Area of Science:
- Cellular mechanics
- Biophysics
- Biomaterials
Background:
- Cells sense environmental stiffness using myosin-generated forces on F-actin, coupled via adhesive proteins (the
- motor-clutch
- framework).
- Previous models assumed balanced motors and clutches, neglecting clutch reinforcement and catch bond behavior.
Purpose of the Study:
- To generalize the motor-clutch framework to include imbalanced motor-clutch regimes, clutch reinforcement, and catch bonding.
- To investigate parameter optimality for maximal force transmission.
- To provide a generalized analytical framework for cell adhesion and migration.
Main Methods:
- Generalized analytical framework for the motor-clutch model.
- Inclusion of imbalanced motor-clutch regimes.
- Analysis of clutch reinforcement and catch bond behavior.
Main Results:
- Traction force is strongly influenced by clutch stiffness, with an identified optimal stiffness for maximal force transmission.
- Clutch reinforcement shifts optimal substrate stiffness to higher values; catch bonds have minimal impact.
- Optimal motor properties are identified on rigid substrates.
Conclusions:
- Cells may tune clutch properties for specific functions.
- Results guide the design of molecular tension sensors for accurate cell-force measurements.
- The framework aids in predicting and controlling cell adhesion and migration in immunotherapy and cancer.
Related Concept Videos
01:28Frictional Forces on Flat Belts
964
Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
964
01:22Machines: Problem Solving I
356
A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
356
01:24Bearings: Problem Solving
306
Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
306
01:21Rolling Resistance
324
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down...
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down...
324
01:13Angle of Twist: Problem Solving
350
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
350
01:19Net Torque Calculations
9.5K
When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
9.5K