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2017 ; 18
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Biglycan- and Sphingosine Kinase-1 Signaling Crosstalk Regulates the Synthesis of
Macrophage Chemoattractants
#MMPMID28282921
Hsieh LT
; Nastase MV
; Roedig H
; Zeng-Brouwers J
; Poluzzi C
; Schwalm S
; Fork C
; Tredup C
; Brandes RP
; Wygrecka M
; Huwiler A
; Pfeilschifter J
; Schaefer L
Int J Mol Sci
2017[Mar]; 18
(3
): ä PMID28282921
show ga
In its soluble form, the extracellular matrix proteoglycan biglycan triggers the
synthesis of the macrophage chemoattractants, chemokine (C-C motif) ligand CCL2
and CCL5 through selective utilization of Toll-like receptors (TLRs) and their
adaptor molecules. However, the respective downstream signaling events resulting
in biglycan-induced CCL2 and CCL5 production have not yet been defined. Here, we
show that biglycan stimulates the production and activation of sphingosine kinase
1 (SphK1) in a TLR4- and Toll/interleukin (IL)-1R domain-containing adaptor
inducing interferon (IFN)-? (TRIF)-dependent manner in murine primary
macrophages. We provide genetic and pharmacological proof that SphK1 is a crucial
downstream mediator of biglycan-triggered CCL2 and CCL5 mRNA and protein
expression. This is selectively driven by biglycan/SphK1-dependent
phosphorylation of the nuclear factor NF-?B p65 subunit, extracellular
signal-regulated kinase (Erk)1/2 and p38 mitogen-activated protein kinases.
Importantly, in vivo overexpression of soluble biglycan causes Sphk1-dependent
enhancement of renal CCL2 and CCL5 and macrophage recruitment into the kidney.
Our findings describe the crosstalk between biglycan- and SphK1-driven
extracellular matrix- and lipid-signaling. Thus, SphK1 may represent a new target
for therapeutic intervention in biglycan-evoked inflammatory conditions.