Imagine a princess who could feel a tiny pea under many mattresses. Cells can do something similar. They can sense what is far away, even if they never touch it.
Scientists at Washington University in St. Louis wrote about this in a study. They wanted to know how cells sense the world beyond the surface they sit on. Learning this could help us understand how cancer spreads.
The Basics of Long‑Range Cell Feeling
Amit Pathak, a professor of mechanical engineering, calls the idea "depth mechano‑sensing." It means a cell can feel the stiffness of material that is not right under it.
Earlier work showed that some fast‑moving cells, like cancer cells, can sense up to 10 µm beyond where they are attached. They do this by pulling on collagen fibers, the tiny threads that make up the surrounding tissue. By stretching these fibers, the cell can feel what lies in the next layer—whether it is hard bone, a soft tissue, or a tumor.
When Cells Work Together They Feel Even Farther
The new study shows that groups of epithelial cells can sense much farther. When many cells push together, they generate a stronger force that can reach through collagen up to 100 µm away.
"Because they act as a team, they create higher forces," said Pathak, who worked with PhD student Hongsheng Yu. Computer models suggest the process happens in two steps: cells first cluster, then they start moving, using the information they gathered to choose a direction.
Why This Matters for Cancer
Cancer cells seem to use this ability to find a path out of the tumor. By feeling what lies ahead, they can travel through soft tissue and avoid obstacles, making it easier for the disease to spread.
Future research will look for the molecules that control how far a cell can sense. If scientists can block this “feeling” ability, they might be able to slow down or stop cancer from moving to other parts of the body.
The work was funded by the National Institutes of Health and the National Science Foundation.