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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Clin+Exp+Immunol
2016 ; 184
(1
): 62-72
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gab.com Text
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The role of high-mobility group box protein 1 in collagen antibody-induced
arthritis is dependent on vascular endothelial growth factor
#MMPMID26671547
Biscetti F
; Flex A
; Pecorini G
; Angelini F
; Arena V
; Stigliano E
; Gremese E
; Tolusso B
; Ferraccioli G
Clin Exp Immunol
2016[Apr]; 184
(1
): 62-72
PMID26671547
show ga
High-mobility group box 1 (HMGB1) has been implicated in angiogenesis and
rheumatoid arthritis (RA). The aim of this study was to define more clearly the
role of HMGB1 in the synovial angiogenesis and pathogenesis of an immune model of
arthritis. BALB/c mice were injected with monoclonal anti-collagen antibody
cocktail followed by lipopolysaccharide to induce arthritis. HMGB1 and vascular
endothelial growth factor (VEGF) were over-expressed in the areas of the synovium
where more inflammation and neoangiogenesis were present. The selective blockade
of HMGB1 or VEGF resulted alternatively in a lower severity of arthritis
evaluated by the arthritis index. Furthermore, exogenous HMGB1 administration
caused a worsening of arthritis, associated with VEGF up-regulation and increased
synovial angiogenesis. The selective inhibition of VEGF also resulted in no
induction of arthritis in mice receiving exogenous HMGB1. Cytokine enzyme-linked
immunosorbent assay (ELISA) analyses performed on peripheral blood and synovial
fluid demonstrated a significant reduction of interleukin (IL)-1?, IL-6 and
tumour necrosis factor (TNF)-? in mice where HMGB1 and VEGF pathways were
blocked. Interestingly, the selective blockade of HMGB1 and VEGF resulted in an
increase of the peripheral IL-17A concentration. The development of arthritis
mediated by HMGB1 and the synovial angiogenesis can be blocked by inhibiting the
VEGF activity. The proinflammatory and proangiogenic cytokine IL-17A was
increased when HMGB1 is inhibited, but the synovial angiogenesis was nevertheless
reduced in this model of arthritis. Taken together, these findings shed new light
on the role of this nuclear protein in the pathogenesis of arthritis in an
RA-like model.