Constriction forces imposed by basement membranes regulate developmental cell migration
Martin-Bermudo, M. D.; Molina Lopez, E.; Kabanova, A.
Show abstract
The basement membrane (BM) is a specialized extracellular matrix, which underlies or encase developing tissues. Mechanical properties of encasing BMs have been shown to profoundly influence the shaping of associated tissues. Here, we use the migration of the border cells (BCs) of the Drosophila egg chamber to unravel a new role of encasing BMs in developmental cell migration. BCs move between a group of cells, the nurse cells (NCs), that are enclosed by a monolayer of follicle cells (FCs), enveloped in turn by a BM, the follicle BM. We show that increasing or reducing the stiffness of the follicle BM, by altering laminins or Coll IV levels, conversely affects BC migration speed and alters migration mode and dynamics. Follicle BM stiffness also controls pairwise NC and FC cortical tension. We propose that constriction forces imposed by the follicle BM influence NC and FC cortical tension, which, in turn, regulate BC migration. Encasing BMs emerge as key players in the regulation of collective cell migration during morphogenesis.
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