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This sandbox is in the article namespace. Either move this page into your userspace, or remove the {{User sandbox}} template. Collective cell migration describes the movements of group of cells and the emergence of collective behavior from cell-environment interactions and cell-cell communication. Collective cell migration is an essential process in the lives of multicellular organisms, e.g. embryonic development, wound healing and cancer spreading (metastasis).[1] Cells can migrate as a cohesive group (e.g. epithelial cells) or have transient cell-cell adhesion sites (e.g. mesenchymal cells).[2] They can also migrate in different modes like sheets, strands, tubes, and clusters.[3] While single-cell migration has been extensively studied, collective cell migration is a relatively new field. Understanding this fundamental phenomenon would have applications in preventing birth defects or dysfunction of embryos, and can also improve cancer treatment by preventing tumors from spreading and forming new tumors.

Cell-environment interactions

The environment of the migrating cell can affect its speed, persistence and direction of migration by stimulating it. The extracellular matrix (ECM) provides not only the structural and biochemical support, but also plays a major role in regulating cell behavior. Different ECM proteins (such as Collagen, Elastin, Fibronectin, Laminin and etc.) allow cells to adhere and migrate, while forming focal adhesions in the front and disassembling them in the back. Using these adhesion sites, cells also sense the mechanical properties of the ECM. Cells can be guided by a gradient of those proteins (haptotaxis) or a gradient of soluble substrates in the liquid phase surrounding the cell (chemotaxis). Cells sense the substrate through their receptors and migrate toward the concentration (or the opposite direction). Another form of stimulation can be rigidity gradients of the ECM (durotaxis).

Confinement

Collective cell migration is enhanced by geometrical confinement of an extracellular matrix (ECM) molecule (e.g. the proteoglycan versican in neural crest cells), that acts as a barrier, to promote the emergence of organized migration in separated streams. Confinement is also observed in vivo, where the optimal width is a function of the number of migrating cells in different streams of different species. [4]

Cell-cell communication

Migrating isolated cell responds to cues in its environment and changes its behavior accordingly. As cell-cell communication does not play a major role in this case, similar trajectories are observed in different isolated cells. However, when the cell migrates as part of the collective, it not only responds to its environment but also interacts with other cells through soluble substrates and physical contact. These cell-cell communication mechanisms are the main reasons for the difference between efficient migration of the collective and random walk movements of the isolated cell. Cell-cell communication mechanisms are widely studied experimentally (in vivo and in vitro)[5] and computationally (in silico)[6].

Co-attraction (CoA)

Co-attraction between collectively migrating cells is the process by which cells of the same type secret chemo-attractant (e.g. C3a in neural crest cells), that stimulates other cells in the group that have the receptors to that chemo-attractant. Cells sense the secreted substrate and respond to the stimulation by moving towards each others and maintain high cell density. [7],[8]

Contact inhibition of locomotion (CIL)

CIL is a process in which the cell changes its direction of movement after colliding into another cell. Those cells could be of the same cell type or different types. The contacts (cell-junctions) are created by transmembrane glycoproteins named cadherins (E-cadherin, N-cadherin or cadherin 11) and other proteins. After cell-cell contact, the protrusions of cells in the contact direction are inhibited. In CIL process cells migrate away from each other by repolarizing in the new direction, so that new protrusions are formed in the front while contractions pull the back from contact.

  • Contact inhibition of proliferation (CIP) describes the inhibition of cell division with increasing percent of confluency. CIP and CIL are two different processes, which are sometimes mistakenly interrelated.[9]

Examples of studied systems

Collective cell migration is studied over many model species:

  1. Border cells in flies (Drosophila melanogaster): the border cells migrate during the differentiation of egg cells to be ready for fertilization. [10]
  2. The lateral line in zebrafish: collective cell migration from head to tails is essential to the development of the sensory system of the fish. The sensors of the lateral line measure the flow over the body-surface of the fish. [11]
  3. Wound healing: collective cell migration is an essential part in this healing process, wound are is closed by the migrating cells. [12]
  4. Neural Crest cells in mice[13], chicks[14], frogs[15] (Xenopus laevis) and fish[16] (zebrafish): collective migration of neural crest cells occurs during embryo development of vertebrates. They migrate long distances from the head (neural tube) to give rise to different tissues. [17]
  5. Spreading of cancer (metastasis): common complication of cancer involve formation of new tumors (secondary tumors), as a result of migration of cancer cells from the primary tumor. Similar to collective cell migration in development and wound healing, cancer cells also undergo Epithelial to mesenchymal transition (EMT), that reduces cell-cell adhesions and allows cancer spreading. [18]

See also

  1. Boids
  2. Cancer metastasis
  3. Collective animal behavior
  4. Collective motion
  5. Embryogenesis
  6. Neural Crest
  7. Wound healing
  1. Neat Algorithms - Flocking
  2. Computational Methods to Quantify and Model Collective Cell Migration
  3. Taking Aim at Moving Targets in Computational Cell Migration
  4. Border cells
  5. Lateral line
  6. Wound healing
  7. Neural crest
  8. How do Boids Work? A Flocking Simulation

References

Collective Cell Migration

  1. ^ Friedl, Peter, Yael Hegerfeldt, and Miriam Tusch. "Collective cell migration in morphogenesis and cancer." International Journal of Developmental Biology 48.5-6 (2004): 441-449.
  2. ^ Weijer, Cornelis J. "Collective cell migration in development." Journal of cell science 122.18 (2009): 3215-3223.
  3. ^ Friedl, Peter. "Prespecification and plasticity: shifting mechanisms of cell migration." Current opinion in cell biology 16.1 (2004): 14-23.
  4. ^ Szabó, András, et al. "In vivo confinement promotes collective migration of neural crest cells." J Cell Biol (2016): jcb-201602083.
  5. ^ Mayor, Roberto, and Sandrine Etienne-Manneville. "The front and rear of collective cell migration." Nature Reviews Molecular Cell Biology (2016).
  6. ^ Szabó, András, and Roberto Mayor. "Modelling collective cell migration of neural crest." Current opinion in cell biology 42 (2016): 22-28.
  7. ^ Woods, M. L., et al. (2014). "Directional Collective Cell Migration Emerges as a Property of Cell Interactions." Plos One 9(9).
  8. ^ Carmona-Fontaine, Carlos, et al. "Complement fragment C3a controls mutual cell attraction during collective cell migration." Developmental cell 21.6 (2011): 1026-1037.
  9. ^ Stoker, M. G. P., and H. Rubin. "Density dependent inhibition of cell growth in culture." Nature 215.5097 (1967): 171-172.
  10. ^ Bianco, A., et al. (2007). "Two distinct modes of guidance signalling during collective migration of border cells." Nature 448(7151): 362-U312.
  11. ^ Nogare, D. D., et al. (2014). "Leading and trailing cells cooperate in collective migration of the zebrafish posterior lateral line primordium." Development 141(16): 3188-3196.
  12. ^ Trepat, X., et al. (2009). "Physical forces during collective cell migration." Nature Physics 5(6): 426-430.
  13. ^ Trainor, Paul A. "Specification of neural crest cell formation and migration in mouse embryos." Seminars in cell & developmental biology. Vol. 16. No. 6. Academic Press, 2005.
  14. ^ Johnston, Malcolm C. "A radioautographic study of the migration and fate of cranial neural crest cells in the chick embryo." The Anatomical Record 156.2 (1966): 143-155.
  15. ^ Sadaghiani, Bahram, and Charles H. Thiébaud. "Neural crest development in the Xenopus laevis embryo, studied by interspecific transplantation and scanning electron microscopy." Developmental biology 124.1 (1987): 91-110.
  16. ^ Smith, Moya, et al. "Trunk neural crest origin of caudal fin mesenchyme in the zebrafish Brachydanio rerio." Proceedings of the Royal Society of London B: Biological Sciences 256.1346 (1994): 137-145.
  17. ^ Le Douarin, Nicole, and Chaya Kalcheim. The neural crest. No. 36. Cambridge University Press, 1999.
  18. ^ Thiery, J. P., et al. (2009). "Epithelial-mesenchymal transitions in development and disease." Cell 139(5): 871-890.
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