title: Long-range ordered vorticity patterns in living tissue induced by cell division.
abstract: In healthy blood vessels with a laminar blood flow, the endothelial cell division rate is low, only sufficient to replace apoptotic cells. The division rate significantly increases during embryonic development and under halted or turbulent flow. Cells in barrier tissue are connected and their motility is highly correlated. Here we investigate the long-range dynamics induced by cell division in an endothelial monolayer under non-flow conditions, mimicking the conditions during vessel formation or around blood clots. Cell divisions induce long-range, well-ordered vortex patterns extending several cell diameters away from the division site, in spite of the system's low Reynolds number. Our experimental results are reproduced by a hydrodynamic continuum model simulating division as a local pressure increase corresponding to a local tension decrease. Such long-range physical communication may be crucial for embryonic development and for healing tissue, for instance around blood clots.
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.
authors.forename: Ninna S
authors.initials: NS
authors.lastname: Rossen
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.
authors.forename: Jens M
authors.initials: JM
authors.lastname: Tarp
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.
authors.forename: Joachim
authors.initials: J
authors.lastname: Mathiesen
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.
authors.forename: Mogens H
authors.initials: MH
authors.lastname: Jensen
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.
authors.forename: Lene B
authors.initials: LB
authors.lastname: Oddershede
mesh_terms: D001703:Biophysics; D001783:Blood Flow Velocity; D002455:Cell Division; D003593:Cytoplasm / Q000378:metabolism; D042783:Endothelial Cells / Q000166:cytology*; D005583:Fourier Analysis; D006439:Hemodynamics; D061307:Human Umbilical Vein Endothelial Cells; D006801:Humans; D057446:Hydrodynamics; D008858:Microscopy, Phase-Contrast; D008955:Models, Cardiovascular; D008962:Models, Theoretical; D013314:Stress, Mechanical