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2013 ; 126
(Pt 4
): 953-65
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gab.com Text
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PDGFR? signaling in the primary cilium regulates NHE1-dependent fibroblast
migration via coordinated differential activity of MEK1/2-ERK1/2-p90RSK and AKT
signaling pathways
#MMPMID23264740
Clement DL
; Mally S
; Stock C
; Lethan M
; Satir P
; Schwab A
; Pedersen SF
; Christensen ST
J Cell Sci
2013[Feb]; 126
(Pt 4
): 953-65
PMID23264740
show ga
In fibroblasts, platelet-derived growth factor receptor alpha (PDGFR?) is
upregulated during growth arrest and compartmentalized to the primary cilium.
PDGF-AA mediated activation of the dimerized ciliary receptor produces a
phosphorylation cascade through the PI3K-AKT and MEK1/2-ERK1/2 pathways leading
to the activation of the Na(+)/H(+) exchanger, NHE1, cytoplasmic alkalinization
and actin nucleation at the lamellipodium that supports directional cell
migration. We here show that AKT and MEK1/2-ERK1/2-p90(RSK) inhibition reduced
PDGF-AA-induced cell migration by distinct mechanisms: AKT inhibition reduced
NHE1 activity by blocking the translocation of NHE1 to the cell membrane. MEK1/2
inhibition did not affect NHE1 activity but influenced NHE1 localization, causing
NHE1 to localize discontinuously in patches along the plasma membrane, rather
than preferentially at the lamellipodium. We also provide direct evidence of NHE1
translocation through the cytoplasm to the leading edge. In conclusion, signals
initiated at the primary cilium through the PDGFR?? cascade reorganize the
cytoskeleton to regulate cell migration differentially through the AKT and the
MEK1/2-ERK1/2-p90(RSK) pathways. The AKT pathway is necessary for initiation of
NHE1 translocation, presumably in vesicles, to the leading edge and for its
activation. In contrast, the MEK1/2-ERK1/2-p90(RSK) pathway controls the spatial
organization of NHE1 translocation and incorporation, and therefore specifies the
direction of the leading edge formation.
|Animals
[MESH]
|Blotting, Western
[MESH]
|Cation Transport Proteins/genetics/*metabolism
[MESH]