A Cdc42-mediated supracellular network drives polarized forces and Drosophila egg chamber extension

Nat Commun. 2020 Apr 21;11(1):1921. doi: 10.1038/s41467-020-15593-2.

Abstract

Actomyosin supracellular networks emerge during development and tissue repair. These cytoskeletal structures are able to generate large scale forces that can extensively remodel epithelia driving tissue buckling, closure and extension. How supracellular networks emerge, are controlled and mechanically work still remain elusive. During Drosophila oogenesis, the egg chamber elongates along the anterior-posterior axis. Here we show that a dorsal-ventral polarized supracellular F-actin network, running around the egg chamber on the basal side of follicle cells, emerges from polarized intercellular filopodia that radiate from basal stress fibers and extend penetrating neighboring cell cortexes. Filopodia can be mechanosensitive and function as cell-cell anchoring sites. The small GTPase Cdc42 governs the formation and distribution of intercellular filopodia and stress fibers in follicle cells. Finally, our study shows that a Cdc42-dependent supracellular cytoskeletal network provides a scaffold integrating local oscillatory actomyosin contractions at the tissue scale to drive global polarized forces and tissue elongation.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actins / metabolism
  • Actomyosin / metabolism
  • Animals
  • Anisotropy
  • Cell Adhesion
  • Cell Polarity
  • Cytoskeleton / metabolism
  • Drosophila / metabolism*
  • Drosophila Proteins / metabolism*
  • Epithelium / metabolism
  • Female
  • GTP-Binding Proteins / metabolism*
  • Glutathione Transferase / metabolism
  • Green Fluorescent Proteins / metabolism
  • Myosin Type II / metabolism
  • Oogenesis*
  • Optogenetics
  • Pseudopodia / metabolism
  • RNA Interference

Substances

  • Actins
  • Cdc42 protein, Drosophila
  • Drosophila Proteins
  • Green Fluorescent Proteins
  • Actomyosin
  • Glutathione Transferase
  • GTP-Binding Proteins
  • Myosin Type II