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- W1489704857 abstract "While much is known in single cell mechanics, the mechanics of regeneration of naturally grown tissues and cell assemblies is largely unexplored. We found a symmetry breaking scenario accompanied by shape fluctuations in dissected regenerating Hydra vulgaris tissue tori. A subsequent folding and merging process leads finally to a regenerating spheroid. These phenomena are related to the dynamics of fluorescent beta- and trans-cellular alpha-actin structures. By embedding the tissues in a hydro-gel the fluctuations could be studied over a longer period of time. The power spectrum of the torus-fluctuations shows a non-trivial energy distribution dynamics depending on the gel stiffness. During the transition, many higher modes where found but in the end the 2nd mode wins in most cases. The toroid builds up an uniform alpha-actin ring along the inner edge of the torus. We found this ring in the inner cellular layer to be responsible for the force generation destabilizing the toroid shape. This actin structure is presumably controlled by the more stable alpha-actin structure of the outer cell-layer. beta-actin, in contrast, seems not to be involved actively. Only when cells switch from the tissue bound state to the individual migrating state, which can be triggered mechanically, this actin isoform was found to become important. We describe structure and dynamics of both actin systems during the folding and tissue merging process finally leading to a spheroid - the inevitable initial state for regeneration." @default.
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- W1489704857 date "2012-07-04" @default.
- W1489704857 modified "2023-09-27" @default.
- W1489704857 title "Fluctuations and symmetry breaking during regeneration of Hydra vulgaris tissue toroids" @default.
- W1489704857 hasPublicationYear "2012" @default.
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