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2015 ; 6
(13
): 11162-74
Nephropedia Template TP
gab.com Text
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English Wikipedia
Synaptopodin-2 induces assembly of peripheral actin bundles and immature focal
adhesions to promote lamellipodia formation and prostate cancer cell migration
#MMPMID25883213
Kai F
; Fawcett JP
; Duncan R
Oncotarget
2015[May]; 6
(13
): 11162-74
PMID25883213
show ga
Synaptopodin-2 (Synpo2), an actin-binding protein and invasive cancer biomarker,
induces formation of complex stress fiber networks in the cell body and promotes
PC3 prostate cancer cell migration in response to serum stimulation. The role of
these actin networks in enhanced cancer cell migration is unknown. Using
time-course analysis and live cell imaging of mock- and Synpo2-transduced PC3
cells, we now show that Synpo2 induces assembly of actin fibers near the cell
periphery and Arp2/3-dependent lamellipodia formation. Lamellipodia formed in a
non-directional manner or repeatedly changed direction, explaining the enhanced
chemokinetic activity of PC3 cells in response to serum stimulation. Myosin
contraction promotes retrograde flow of the Synpo2-associated actin filaments at
the leading edge and their merger with actin networks in the cell body. Enhanced
PC3 cell migration correlates with Synpo2-induced formation of lamellipodia and
immature focal adhesions (FAs), but is not dependent on myosin contraction or FA
maturation. The previously reported correlation between Synpo2-induced stress
fiber assembly and enhanced PC3 cell migration therefore reflects the role of
Synpo2 as a newly identified regulator of actin bundle formation and nascent FA
assembly near the leading cell edge.