Our institute is composed of 5 departments
Laboratories of the Institute
Publications, Books & Publishing, Defended theses
Highlight | Scientific result
50-micron-wide cells that manage to squeeze into channels 10 microns or even 4 microns in diameter! Researchers at IRIG have revealed that these cellular contortions, by the way of spectacular deformations of the nucleus, originate from a key element of their cytoskeleton: microtubules.
Cellular mechanical effects are classically achieved by the contraction of actin filaments thanks to molecular motors, the myosins. However, actin alone does not allow cells to pass through such small interstices. Researchers at IRIG, in collaboration with teams from CNRS and Utrecht University in Holland, have revealed the vital role played by microtubules in achieving such a morphological transformation. (figure).
Since 2013, as they have developed their studies on the shape and division of stem cells, researchers have discovered how sensitive microtubules are to the pressure forces experienced by the cell in the interstices. The scientists have cleverly developed a device based on a kind of plastic film in which living cells are grafted: by stretching the film, it becomes possible to apply precise deformations to the cells. Forces are applied with perfectly controlled speed, frequency, direction and pressure-relaxation. In this way, microtubules, which are generally highly dynamic, are stabilized when the cells are compressed into the interstices, enabling them to progress.
In addition, the researchers identified the molecular mechanism of microtubule stabilization: proteins associated with the growing ends of microtubules ensure their rapid elongation by repositioning themselves in the deformed zones.
These studies reveal new fundamental properties of microtubules and demonstrate their involvement in cell migration in response to the mechanical and spatial constraints of the environment. These processes could well be involved in tumor invasion or tissue exploration by immune cells. The mechanism identified could lead to the development of a new molecular strategy to control cell migration.
Figure: microtubule network architecture.
Li Y, Kučera O, Cuvelier D, Rutkowski D M, Deygas M, Rai D, Pavlovič T, Vicente F N, Piel M, Giannone G, Vavylonis D, Akhmanova A, Blanchoin L and Théry MCompressive forces stabilise microtubules in living cells
Nature Materials 2023
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.