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Tensional homeostasis and the malignant phenotype.
Matthew J Paszek1, Nastaran Zahir, Kandice R Johnson
1Department of Bioengineering, University of Pennsylvania, Philadelphia, 19104, USA.
Cancer Cell
|September 20, 2005
Summary
Tumor stiffness promotes malignancy by altering cell adhesion and tissue structure through integrin signaling. Reducing Rho or ERK activity can revert malignant phenotypes, revealing a mechanoregulatory circuit.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Cancer Research
Background:
- Tumors exhibit increased stiffness compared to normal tissues.
- Integrins function as mechanotransducers influencing cell fate and behavior.
- Altered integrin expression is a hallmark of cancerous tissues.
Purpose of the Study:
- To investigate if tissue stiffness promotes malignant behavior by modulating integrins.
- To elucidate the molecular mechanisms linking matrix stiffness to cytoskeletal tension and tissue phenotype.
Main Methods:
- Analysis of tumor stroma stiffness and Rho-dependent cytoskeletal tension.
- Investigation of integrin clustering, ERK activation, and ROCK-generated contractility in epithelial morphogenesis.
- Experimental reversion of malignant phenotypes by modulating Rho or ERK activity.
Main Results:
- Tumor rigidity is associated with stiff stroma and elevated Rho-dependent cytoskeletal tension.
- Matrix stiffness promotes epithelial morphogenesis defects by enhancing integrin clustering, ERK activation, and ROCK-mediated contractility.
- Decreasing Rho-generated contractility or ERK activity reverted malignant epithelia to a normal phenotype.
Conclusions:
- Integrins, ERK, and Rho form an integrated mechanoregulatory circuit.
- This circuit links matrix stiffness to cytoskeletal tension, thereby regulating tissue phenotype and potentially promoting malignancy.
- Targeting this pathway offers potential therapeutic strategies for cancer treatment.