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Cell tension, matrix mechanics, and cancer development
http://www.sciencedirect.com –
Oncologists often diagnose cancer based on a change of tissue stiffness sensed by palpation, yet cancer researchers generally focus on biochemical signaling mechanisms. Tumors are more rigid because they have a stiffer extracellular matrix. A new study shows that this alteration of matrix mechanics activates integrins, which not only promotes mitogenic signaling through Erk but also cell contractility through Rho, which can further increase matrix stiffness. This establishes a positive feedback loop that switches on the malignant phenotype in mammary epithelial cells. Read more »
Year of publication:
2005
Journal name:
Cancer Cell
Animal cell hydraulics
http://jcs.biologists.org –
Water is the dominant ingredient of cells and its dynamics are crucial to life. We and others have suggested a physical picture of the cell as a soft, fluid-infiltrated sponge, surrounded by a water-permeable barrier. To understand water movements in an animal cell, we imposed an external, inhomogeneous osmotic stress on cultured cancer cells. This forced water through the membrane on one side, and out on the other. Inside the cell, it created a gradient in hydration, that we visualized by tracking cellular responses using natural organelles and artificially introduced quantum dots. Read more »
Year of publication:
2009
Journal name:
Journal of Cell Science.
A tense situation: forcing tumour progression
http://www.ncbi.nlm.nih.gov –
Cells within tissues are continuously exposed to physical forces including hydrostatic pressure, shear stress, and compression and tension forces. Cells dynamically adapt to force by modifying their behaviour and remodelling their microenvironment. They also sense these forces through mechanoreceptors and respond by exerting reciprocal actomyosin- and cytoskeletal-dependent cell-generated force by a process termed 'mechanoreciprocity'. Loss of mechanoreciprocity has been shown to promote the progression of disease, including cancer. Read more »
Year of publication:
2009
Journal name:
Nature Reviews Cancer
Environmentally Controlled Invasion of Cancer Cells by Engineered Bacteria
http://www.sciencedirect.com –
Bacteria can sense their environment, distinguish between cell types, and deliver proteins to eukaryotic cells. Here, we engineer the interaction between bacteria and cancer cells to depend on heterologous environmental signals. We have characterized invasin from Yersinia pseudotuburculosis as an output module that enables Escherichia coli to invade cancer-derived cells, including HeLa, HepG2, and U2OS lines. To environmentally restrict invasion, we placed this module under the control of heterologous sensors. Read more »
Year of publication:
2005
Journal name:
Journal of Molecular Biology