Original title: Irregular curvature at focal adhesions modulates Piezo1 activity and low frequency ultrasound induced apoptosis in cancer cells
Ivana Pajic-Lijakovic, Milan Milivojevic, Boris Martinac, Peter V. E. McClintock · June 2026
Low-frequency, low-intensity ultrasound can trigger programmed cell death, called apoptosisProgrammed cell death, a normal process that removes damaged or unwanted cells., in cancer cells while sparing healthy epithelial cells and fibroblasts. Scientists did not understand what causes this selectivity. Researchers developed a theoretical framework based on cell mechanics to find out. The mechanism depends on how cell skeletons bend their outer membranes. Cancer cells have uneven internal stress-fiber networksBundles of proteins inside the cell that help it maintain shape and move.. When exposed to low-intensity ultrasound, this unevenness causes irregular inward membrane curves around focal adhesionsPoints where a cell attaches to its surroundings, like anchors., the spots where cells anchor themselves. These irregular curves keep Piezo1A protein in the cell membrane that senses mechanical pressure and can trigger cell death. pressure-sensing channels loosely packed, which preserves channel activity and leads to cancer cell death. In contrast, healthy cells have more uniform internal skeletons. This regularity causes regular membrane curves that trigger cholesterol redistribution, which reorganizes Piezo1 clusters and reduces coordinated channel activity. As a result, healthy cells stay active and keep growing under ultrasound.
Imagine packing a suitcase. If you fold clothes neatly, everything lies flat and fits snugly. But if you just shove things in, the surface bulges unevenly. In a neatly packed suitcase, the zipper glides smoothly. In a messy one, the zipper catches and pulls at odd angles. In this paper, the suitcase is a cell, and the clothes are its internal scaffolding. Cancer cells are packed messily, so their outer membrane curves irregularly, which keeps a pressure-sensing protein active and triggers cell death. Healthy cells are packed neatly, so the membrane curves smoothly, and that protein stays quiet.
Ultrasound therapy could become a gentler alternative to chemotherapy, targeting only cancer cells while leaving healthy tissue unharmed. This paper explains why that selectivity happens, pointing to differences in cell structure. Understanding this could help design better, more precise cancer treatments.
The abstract presents a theoretical framework, not experimental proof. It relies on previous findings and modeling, so the proposed mechanism is not directly tested here. It does not specify the exact ultrasound parameters or cancer types studied, nor does it quantify the degree of selectivity.
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Irregular curvature at focal adhesions modulates Piezo1 activity and low frequency ultrasound induced apoptosis in cancer cells — Ivana Pajic-Lijakovic, Milan Milivojevic, Boris Martinac et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.