Cell-Type-Specific Mechanical Thresholds of Piezo1 Regulate Cancer Cell Migration and Proliferation

Area of Science:

• Mechanobiology
• Cancer Research
• Cell Signaling

Background:

• Piezo1 ion channel demonstrates context-dependent roles in cancer, acting as both a promoter of metastasis and a suppressor of tumor progression.
• This functional duality complicates its use as a targeted cancer therapy.
• Understanding the mechanistic basis of Piezo1's varied functions is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the mechanistic basis for the paradoxical roles of Piezo1 in different cancer types.
• To elucidate the relationship between cellular mechanosensitivity thresholds and Piezo1-mediated signaling.
• To propose a model explaining cancer cell adaptation to microenvironmental mechanical cues.

Main Methods:

• Correlative atomic force microscopy-confocal laser scanning microscopy (AFM-CLSM).
• Direct stochastic optical reconstruction microscopy (dSTORM).
• Analysis of calcium signaling, cytoskeletal remodeling, adhesion, and proliferation in T24 bladder cancer and A549 non-small cell lung cancer cells.

Main Results:

• High mechanical sensitivity T24 cells utilize Piezo1 for migration via calcium signaling, cytoskeletal remodeling, and adhesion.
• Low mechanical sensitivity A549 cells employ a Piezo1-independent migration pathway and regulate proliferation via a YAP pathway.
• T24 cells exhibit a Piezo1-integrin compensatory mechanism absent in A549 cells.

Conclusions:

• A cell-type-specific mechanosensing threshold model is proposed, where Piezo1 activity is dependent on mechanical stimulus intensity relative to cellular threshold.
• Subthreshold mechanical stimuli activate Piezo1 to promote proliferation, while supra-threshold stimulation inhibits growth, revealing an adaptive cancer cell strategy.
• Findings provide a theoretical foundation for developing mechanotype-based targeted therapies against Piezo1 in cancer.