Abstract
Adult stem cells balance self-renewal and differentiation to build, maintain and repair tissues. The role of signalling pathways and transcriptional networks in controlling stem cell function has been extensively studied, but there is increasing appreciation that mechanical forces also have a crucial regulatory role. Mechanical forces, signalling pathways and transcriptional networks must be coordinated across diverse length and timescales to maintain tissue homeostasis and function. Such coordination between stem cells and neighbouring cells dictates when cells divide, migrate and differentiate. Recent advances in measuring and manipulating the mechanical forces that act upon and are produced by stem cells are providing new insights into development and disease. In this Review, we discuss the mechanical forces involved when epithelial stem cells construct their microenvironment and what happens in cancer when stem cell niche mechanics are disrupted or dysregulated. As the skin has evolved to withstand the harsh mechanical pressures from the outside environment, we often use the stem cells of mammalian skin epithelium as a paradigm for adult stem cells shaping their surrounding tissues.
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Acknowledgements
J.A. is a MacMillan Family Foundation Awardee of the Life Sciences Research Foundation. E.F. is a Howard Hughes Medical Investigator and is supported by grants from the NIH (R01-AR050452, R01-AR31737 and R37-AR27883), the Starr Foundation and the Stavros Niarchos Foundation.
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Glossary
- Anchor cell
-
A specialized cell involved in the development of the reproductive system in nematodes such as Caenorhabditis elegans.
- Anthracycline
-
A type of chemotherapeutic agent that targets topoisomerase and causes DNA damage.
- Basement membrane
-
A thin layer of specialized extracellular matrix that sustains epithelia and endothelia, demarcating epithelial–stromal boundaries; it constitutes an anchoring surface for basal epithelial cells to divide.
- Caveolae
-
Organized, complex invaginations of the plasma membrane.
- Convergent extension
-
The narrowing and elongation of certain tissues during embryonic development.
- Desmosomes
-
Cell–cell junctions formed of keratins, cadherins, desmoplakins and plakoglobins.
- D. melanogaster wing disc
-
An appendage of epidermal stem cell precursors of the wing.
- Dorsal mesentery
-
A thin mesenchymal tissue that connects the intestines to the abdominal wall.
- Epiboly
-
In developmental biology, the spreading of the ectoderm simultaneous to the positioning of endoderm and mesoderm inside the embryo.
- Germband
-
Primary layer of cells during embryonic development.
- Hemidesmosomes
-
Cell–basement membrane junctions formed by keratins, integrins, plectins, laminins and collagen.
- HRAS G12V
-
A MAPK pathway hyperactivating oncogenic mutation frequent in skin carcinoma.
- KRAS G12D
-
A MAPK pathway hyperactivating oncogenic mutation frequent in pancreatic and lung cancers.
- Mechanotransduction
-
Integration of mechanical input into intracellular signalling.
- Mesenchyme
-
Embryonic connective tissue formed mostly by mesodermal cells and extracellular matrix.
- Mesothelium
-
Epithelium that surrounds the chest, abdominal and pelvic cavities.
- Multipotent progenitor cells
-
Cells capable of differentiating into different cells of a particular lineage.
- Oncogenic transformation
-
Genetic alteration that gives rise to a cancer cell.
- Placode
-
A pancake-shaped thickening of the ectoderm layer in the formation of glands and hair follicles.
- PyMT
-
Polyomavirus middle-T oncogene used in mouse genetics to induce mammary tumours.
- Smoothened
-
Frizzled G protein-coupled receptor required for activation of the embryonic Hedgehog pathway.
- Stroma
-
Cells and molecules in the connective tissue of an organ.
- Suprabasal cells
-
Of the skin, differentiated keratinocytes over the basal (stem) layer.
- Taxane
-
A type of chemotherapeutic agent that inhibits tubulin polymerization.
- Tight junctions
-
Cell–cell junctions formed by claudins and occludins.
- Tricellular junctions
-
Specialized cell–cell junctions at the apical side of three epithelial or endothelial cells.
- Young’s modulus
-
Mechanical property of solid materials that measures stiffness when a force is applied lengthwise.
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Fiore, V.F., Almagro, J. & Fuchs, E. Shaping epithelial tissues by stem cell mechanics in development and cancer. Nat Rev Mol Cell Biol (2025). https://doi.org/10.1038/s41580-024-00821-0
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DOI: https://doi.org/10.1038/s41580-024-00821-0