Ion channels contribute to the regulation of cell sheet forces during Drosophila dorsal closure.

Journal Article

We demonstrate that ion channels contribute to the regulation of dorsal closure in Drosophila, a model system for cell sheet morphogenesis. We find that Ca(2+) is sufficient to cause cell contraction in dorsal closure tissues, as UV-mediated release of caged Ca(2+) leads to cell contraction. Furthermore, endogenous Ca(2+) fluxes correlate with cell contraction in the amnioserosa during closure, whereas the chelation of Ca(2+) slows closure. Microinjection of high concentrations of the peptide GsMTx4, which is a specific modulator of mechanically gated ion channel function, causes increases in cytoplasmic free Ca(2+) and actomyosin contractility and, in the long term, blocks closure in a dose-dependent manner. We identify two channel subunits, ripped pocket and dtrpA1 (TrpA1), that play a role in closure and other morphogenetic events. Blocking channels leads to defects in force generation via failure of actomyosin structures, and impairs the ability of tissues to regulate forces in response to laser microsurgery. Our results point to a key role for ion channels in closure, and suggest a mechanism for the coordination of force-producing cell behaviors across the embryo.

Full Text

Duke Authors

Cited Authors

  • Hunter, GL; Crawford, JM; Genkins, JZ; Kiehart, DP

Published Date

  • January 2014

Published In

Volume / Issue

  • 141 / 2

Start / End Page

  • 325 - 334

PubMed ID

  • 24306105

Electronic International Standard Serial Number (EISSN)

  • 1477-9129

Digital Object Identifier (DOI)

  • 10.1242/dev.097097

Language

  • eng

Conference Location

  • England