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2016 ; 11
(3
): e0152376
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RAGE and TGF-?1 Cross-Talk Regulate Extracellular Matrix Turnover and Cytokine
Synthesis in AGEs Exposed Fibroblast Cells
#MMPMID27015414
Serban AI
; Stanca L
; Geicu OI
; Munteanu MC
; Dinischiotu A
PLoS One
2016[]; 11
(3
): e0152376
PMID27015414
show ga
AGEs accumulation in the skin affects extracellular matrix (ECM) turnover and
triggers diabetes associated skin conditions and accelerated skin aging. The
receptor of AGEs (RAGE) has an essential contribution to cellular dysfunction
driven by chronic inflammatory responses while TGF-?1 is critical in both dermal
homeostasis and inflammation. We investigated the contribution of RAGE and TGF-?1
to the modulation of inflammatory response and ECM turnover in AGEs milieu, using
a normal fibroblast cell line. RAGE, TGF-?1, collagen I and III gene and protein
expression were upregulated after exposure to AGEs-BSA, and MMP-2 was activated.
AGEs-RAGE was pivotal in NF-?B dependent collagen I expression and joined with
TGF-?1 to stimulate collagen III expression, probably via ERK1/2 signaling.
AGEs-RAGE axis induced upregulation of TGF-?1, TNF-? and IL-8 cytokines. TNF-?
and IL-8 were subjected to TGF-?1 negative regulation. RAGE's proinflammatory
signaling also antagonized AGEs-TGF-?1 induced fibroblast contraction, suggesting
the existence of an inhibitory cross-talk mechanism between TGF-?1 and RAGE
signaling. RAGE and TGF-?1 stimulated anti-inflammatory cytokines IL-2 and IL-4
expression. GM-CSF and IL-6 expression appeared to be dependent only on TGF-?1
signaling. Our data also indicated that IFN-? upregulated in AGEs-BSA milieu in a
RAGE and TGF-?1 independent mechanism. Our findings raise the possibility that
RAGE and TGF-?1 are both involved in fibrosis development in a complex cross-talk
mechanism, while also acting on their own individual targets. This study
contributes to the understanding of impaired wound healing associated with
diabetes complications.
|Cells, Cultured
[MESH]
|Collagen/metabolism
[MESH]
|Culture Media, Conditioned/chemistry
[MESH]
|Cytokines/*metabolism
[MESH]
|Extracellular Matrix/*metabolism
[MESH]
|Fibroblasts/*metabolism
[MESH]
|Glycation End Products, Advanced/*metabolism
[MESH]