Physical cell tension decides if cancer takes hold
Why does the same cancer-causing mutation form a tumor in one tissue but not in another? Researchers found that the physical forces between cells play a decisive role.
Cancer begins with a genetic error in a single cell. But whether that cell grows into a dangerous tumor depends on more than the gene involved. Scientists published findings in eLife showing that the mechanical properties of tissue determine whether a mutant cell gets expelled or spreads.
They studied cells carrying a mutation in the gene HRas, a common cancer driver. In mammary (breast) epithelium, isolated mutant cells were extruded by their healthy neighbors, a normal defense mechanism of the epithelium (the lining of organs and tube-like structures). In bronchial (lung) epithelium, the same cells spread persistently and formed long protrusions, regardless of how many mutant cells were present.
Boundary tension determines the outcome
The explanation lies in what the researchers call heterotypic interfacial tension: the physical force at the boundary between a mutant cell and its healthy neighbors. In breast tissue, that tension is high enough to physically push the mutant cell out. In lung tissue, the boundary is more compliant, allowing the cell to hold its position and expand.
This helps explain something geneticists have long found puzzling: two people with the same cancer mutation can develop very different tumors depending on the tissue. Genetic factors explain only part of that difference. Mechanical factors, including cell-cell tension and cell shape, play an independent role.
What does this mean for future treatments?
The findings are experimental. But they raise the possibility that modulating interfacial mechanical tension in tissue could influence cancer cell behavior. That is a largely unexplored route alongside the conventional approach of blocking gene mutations. Whether this is clinically feasible in humans requires further research.
From a longevity standpoint, aging tissue progressively changes its mechanical properties. Whether that creates a more permissive environment for cancer cells is an open question this research begins to address.
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