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2017 ; 91
(3
): 628-641
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English Wikipedia
Lysophosphatidic acid signaling through its receptor initiates profibrotic
epithelial cell fibroblast communication mediated by epithelial cell derived
connective tissue growth factor
#MMPMID27927603
Sakai N
; Chun J
; Duffield JS
; Lagares D
; Wada T
; Luster AD
; Tager AM
Kidney Int
2017[Mar]; 91
(3
): 628-641
PMID27927603
show ga
The expansion of the fibroblast pool is a critical step in organ fibrosis, but
the mechanisms driving expansion remain to be fully clarified. We previously
showed that lysophosphatidic acid (LPA) signaling through its receptor LPA(1)
expressed on fibroblasts directly induces the recruitment of these cells. Here we
tested whether LPA-LPA(1) signaling drives fibroblast proliferation and
activation during the development of renal fibrosis. LPA(1)-deficient
(LPA(1)(-/-)) or -sufficient (LPA(1)(+/+)) mice were crossed to mice with green
fluorescent protein expression (GFP) driven by the type I procollagen promoter
(Col-GFP) to identify fibroblasts. Unilateral ureteral obstruction-induced
increases in renal collagen were significantly, though not completely, attenuated
in LPA(1)(-/-)Col-GFP mice, as were the accumulations of both fibroblasts and
myofibroblasts. Connective tissue growth factor was detected mainly in tubular
epithelial cells, and its levels were suppressed in LPA(1)(-/-)Col-GFP mice.
LPA-LPA(1) signaling directly induced connective tissue growth factor expression
in primary proximal tubular epithelial cells, through a myocardin-related
transcription factor-serum response factor pathway. Proximal tubular epithelial
cell-derived connective tissue growth factor mediated renal fibroblast
proliferation and myofibroblast differentiation. Administration of an inhibitor
of myocardin-related transcription factor/serum response factor suppressed
obstruction-induced renal fibrosis. Thus, targeting LPA-LPA(1) signaling and/or
myocardin-related transcription factor/serum response factor-induced
transcription could be promising therapeutic strategies for renal fibrosis.