Selective killing of transformed cells by mechanical stretch

Area of Science:

• Cell Biology
• Biophysics
• Cancer Research

Background:

• Cancer cells exhibit distinct features from normal cells, including altered mechanosensing.
• Tumor cells respond aberrantly to external mechanical stimuli.

Purpose of the Study:

• To investigate the differential response of normal and tumor cells to mechanical forces.
• To elucidate the mechanisms underlying mechanotransduction in cancer.

Main Methods:

• Cyclic stretching of tumor and normal cells on surfaces of varying stiffness.
• Depletion and restoration of the rigidity sensor protein (Tropomyosin 2.1).
• Analysis of calcium influx, apoptosis pathways (calpain 2, BAX, caspase 3), and cell growth.

Main Results:

• Cyclic stretching reduces tumor cell growth and induces apoptosis on soft surfaces.
• Normal cells mimic tumor cell behavior upon depletion of Tropomyosin 2.1.
• Restoring rigidity sensing in tumor cells leads to enhanced growth and reduced apoptosis on soft surfaces under cyclic stretching.
• Mechanoptosis in transformed cells involves Piezo1, calpain 2, BAX, and caspase 3 activation.

Conclusions:

• Mechanical perturbations can selectively induce apoptosis in tumor cells.
• Normal cell growth can be stimulated by mechanical forces.
• Targeting mechanosensing pathways offers a novel therapeutic strategy for cancer treatment.