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2017 ; 6
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Uncoupling apical constriction from tissue invagination
#MMPMID28263180
Chung S
; Kim S
; Andrew DJ
Elife
2017[Mar]; 6
(ä): ä PMID28263180
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Apical constriction is a widely utilized cell shape change linked to folding,
bending and invagination of polarized epithelia. It remains unclear how apical
constriction is regulated spatiotemporally during tissue invagination and how
this cellular process contributes to tube formation in different developmental
contexts. Using Drosophila salivary gland (SG) invagination as a model, we show
that regulation of folded gastrulation expression by the Fork head transcription
factor is required for apicomedial accumulation of Rho kinase and non-muscle
myosin II, which coordinate apical constriction. We demonstrate that neither loss
of spatially coordinated apical constriction nor its complete blockage prevent
internalization and tube formation, although such manipulations affect the
geometry of invagination. When apical constriction is disrupted, compressing
force generated by a tissue-level myosin cable contributes to SG invagination. We
demonstrate that fully elongated polarized SGs can form outside the embryo,
suggesting that tube formation and elongation are intrinsic properties of the SG.