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2017 ; 28
(13
): 1768-1781
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Regulation of circular dorsal ruffles, macropinocytosis, and cell migration by
RhoG and its exchange factor, Trio
#MMPMID28468978
Valdivia A
; Goicoechea SM
; Awadia S
; Zinn A
; Garcia-Mata R
Mol Biol Cell
2017[Jul]; 28
(13
): 1768-1781
PMID28468978
show ga
Circular dorsal ruffles (CDRs) are actin-rich structures that form on the dorsal
surface of many mammalian cells in response to growth factor stimulation. CDRs
represent a unique type of structure that forms transiently and only once upon
stimulation. The formation of CDRs involves a drastic rearrangement of the
cytoskeleton, which is regulated by the Rho family of GTPases. So far, only Rac1
has been consistently associated with CDR formation, whereas the role of other
GTPases in this process is either lacking or inconclusive. Here we show that RhoG
and its exchange factor, Trio, play a role in the regulation of CDR dynamics,
particularly by modulating their size. RhoG is activated by Trio downstream of
PDGF in a PI3K- and Src-dependent manner. Silencing RhoG expression decreases the
number of cells that form CDRs, as well as the area of the CDRs. The regulation
of CDR area by RhoG is independent of Rac1 function. In addition, our results
show the RhoG plays a role in the cellular functions associated with CDR
formation, including macropinocytosis, receptor internalization, and cell
migration. Taken together, our results reveal a novel role for RhoG in the
regulation of CDRs and the cellular processes associated with their formation.