Researchers have discovered that compressing cancer cells leads to their self-destruction. Collaborative efforts by experts at Fudan University, Sun Yat-sen University, and the Chinese Academy of Sciences in Shanghai have shown this through three-dimensional models. These models demonstrated how cancer cells react when subjected to prolonged mechanical confinement.
The study findings, published in the journal Developmental Cell on October 14, reveal that cells under tight confinement undergo a chronic stress response. This response affects their ability to metastasize, or spread, culminating in cell death.
Study Insights
The researchers focused on the mesenchymal-to-amoeboid transition (MAT). This stage enables cancer cells to move through narrow spaces without needing genetic transcription.
Professor Liming Sun and Dr. Yan-Jun Liu explained to Newsweek that one critical challenge for metastatic cancer cells is squeezing through narrow spaces as they spread from the primary tumor. They devised a model where cells were compressed into thin spaces without attaching to surfaces. This setup closely mimicked the stressful conditions cells face during metastasis.
Under confinement, cells initially switched to a mobile, amoeba-like state in attempts to escape. However, prolonged pressure made them cease movement and initiate cell death. These conditions activated MLKL, a protein that triggers cell death.
Before dying, the cancer cells lost their shape and invasive abilities. This process rid tumors of high MLKL-expressing cells, leading to a build-up of low MLKL-expressing, necroptosis-resistant clones, which proved more aggressive.
The researchers observed similar responses across various cancer types. They suggest this may be a general principle of how tumor cells respond to extended physical stress. However, the extent of response varies, necessitating further investigation.
Implications of the Findings
The study authors informed Newsweek that persistent mechanical stress could naturally hinder cancer cell spread. It both eliminates highly invasive cells and enhances immune recognition of tumors.
MLKL expression might serve as a biomarker for tumor progression. Cancer cells with higher MLKL were more prone to death under mechanical stress, whereas low MLKL cells survived longer.
This selective pressure may encourage the expansion of aggressive escape clones. Monitoring MLKL levels could provide insight into tumor evolution during disease progression.
The findings hold potential for shaping new cancer therapies. Pharmacologically activating MLKL might boost cancer cell elimination during confinement.
The study advocates for therapies targeting both biochemical pathways and the unique mechanical environments of tumors. Combining MLKL activation with traditional cancer treatments could enhance the body’s defense against metastasis.
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