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2016 ; 38
(1
): 47-60
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Rab10-Mediated Secretion Synergizes with Tissue Movement to Build a Polarized
Basement Membrane Architecture for Organ Morphogenesis
#MMPMID27404358
Isabella AJ
; Horne-Badovinac S
Dev Cell
2016[Jul]; 38
(1
): 47-60
PMID27404358
show ga
Basement membranes (BMs) are planar protein networks that support epithelial
function. Regulated changes to BM architecture can also contribute to tissue
morphogenesis, but how epithelia dynamically remodel their BMs is unknown. In
Drosophila, elongation of the initially spherical egg chamber correlates with the
generation of a polarized network of fibrils in its surrounding BM. Here, we use
live imaging and genetic manipulations to determine how these fibrils form. BM
fibrils are assembled from newly synthesized proteins in the pericellular spaces
between the egg chamber's epithelial cells and undergo oriented insertion into
the BM by directed epithelial migration. We find that a Rab10-based secretion
pathway promotes pericellular BM protein accumulation and fibril formation.
Finally, by manipulating this pathway, we show that BM fibrillar structure
influences egg chamber morphogenesis. This work highlights how regulated protein
secretion can synergize with tissue movement to build a polarized BM architecture
that controls tissue shape.