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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+Mol+Allergy
2016 ; 14
(ä): 16
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Chitinase 3-like-1 is produced by human Th17 cells and correlates with the level
of inflammation in juvenile idiopathic arthritis patients
#MMPMID27826220
Capone M
; Maggi L
; Santarlasci V
; Rossi MC
; Mazzoni A
; Montaini G
; Cimaz R
; Ramazzotti M
; Piccinni MP
; Barra G
; De Palma R
; Liotta F
; Maggi E
; Romagnani S
; Annunziato F
; Cosmi L
Clin Mol Allergy
2016[]; 14
(ä): 16
PMID27826220
show ga
BACKGROUND: CHI3L1 is a chitinase-like protein without enzymatic activity,
produced by activated macrophages, chondrocytes, neutrophils. Recent studies on
arthritis, asthma, and inflammatory bowel diseases suggest that chitinases are
important in inflammatory processes and tissue remodeling, but their production
by human T cells, has never been reported. METHODS: A microarray analysis of gene
expression profile was performed on Th17 and classic Th1 cell clones and CHI3L1
was found among the up-regulated genes on Th17 cells. Different types of helper T
cell clones (TCCs) were then evaluated by Real Time PCR (RT-PCR) for CHI3L1 mRNA
expression; protein expression was investigated in cell lysates by western
blotting and in cultures supernatants by ELISA. ELISA was also used to measure
CHI3L1 in the serum and in the synovial fluid (SF) of juvenile idiopathic
arthritis (JIA) patients. RESULTS: At mRNA level CHI3L1 was highly expressed by
Th17, Th17/Th1, non classic Th1 and even in Th17/Th2 cell clones, whereas it was
virtually absent in CD161- classic Th1 and Th2 TCCs. CHI3L1 was also detected in
cell culture supernatants of Th17 and Th17-derived cells but not of classic Th1.
Moreover CHI3L1 was higher in the SF than in serum of JIA patients, and it
positively correlated with the frequency of Th17 and non-classic Th1 cells in SF.
CHI3L1 in SF also positively correlated with the C reactive protein (CRP) serum
levels, and with the levels of some proinflammatory cytokines, such as IL-6 and
p40, which is the common subunit of IL12 and IL23. CONCLUSIONS: Here we describe
for the first time CHI3L1 production by T cells owing the Th17 family. Moreover
the positive correlation found between the frequency of Th17 and Th17-derived
cell subsets and CHI3L1 levels in SF of JIA patients, in agreement with the
suggested role of these cells in inflammatory process, candidates CHI3L1 as a
possible biological target in JIA treatment.