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2014 ; 33
(7
): 702-18
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A combination of Wnt and growth factor signaling induces Arl4c expression to form
epithelial tubular structures
#MMPMID24562386
Matsumoto S
; Fujii S
; Sato A
; Ibuka S
; Kagawa Y
; Ishii M
; Kikuchi A
EMBO J
2014[Apr]; 33
(7
): 702-18
PMID24562386
show ga
Growth factor-dependent epithelial morphological changes and proliferation are
essential for the formation of tubular structures, but the underlying molecular
mechanisms are poorly understood. Co-stimulation with Wnt3a and epidermal growth
factor (Wnt3a/EGF) induced development of tubes consisting of intestinal
epithelial cells by inducing expression of Arl4c, an Arf-like small GTP-binding
protein, in three-dimensional culture, while stimulation with Wnt3a or EGF alone
did not. Arl4c expression resulted in rearrangement of the cytoskeleton through
activation of Rac and inactivation of Rho properly, which promoted cell growth by
inducing nuclear translocation of Yes-associated protein and transcriptional
co-activator with PDZ-binding motif (YAP/TAZ) in leading cells. Arl4c was
expressed in ureteric bud tips and pretubular structures in the embryonic kidney.
In an organoid culture assay, Wnt and fibroblast growth factor signaling
simultaneously induced elongation and budding of kidney ureteric buds through
Arl4c expression. YAP/TAZ was observed in the nucleus of extending ureteric bud
tips. Thus, Arl4c expression induced by a combination of growth factor signaling
mechanisms is involved in tube formation.