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2015 ; 212
(11
): 1793-802
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Interleukin-27 inhibits ectopic lymphoid-like structure development in early
inflammatory arthritis
#MMPMID26417004
Jones GW
; Bombardieri M
; Greenhill CJ
; McLeod L
; Nerviani A
; Rocher-Ros V
; Cardus A
; Williams AS
; Pitzalis C
; Jenkins BJ
; Jones SA
J Exp Med
2015[Oct]; 212
(11
): 1793-802
PMID26417004
show ga
Ectopic lymphoid-like structures (ELSs) reminiscent of secondary lymphoid organs
often develop at sites of chronic inflammation where they contribute to
immune-mediated pathology. Through evaluation of synovial tissues from rheumatoid
arthritis (RA) patients, we now show that low interleukin-27 (IL-27) expression
corresponds with an increased incidence of ELS and gene signatures associated
with their development and activity. The presence of synovial ELS was also noted
in mice deficient in the IL-27 receptor (IL-27R) after the onset of inflammatory
arthritis. Here, pathology was associated with increased synovial expression of
pro-inflammatory cytokines, homeostatic chemokines, and transcriptional
regulators linked with lymphoid neogenesis. In both clinical and experimental RA,
synovial ELS coincided with the heightened local expression of cytokines and
transcription factors of the Th17 and T follicular helper (Tfh) cell lineages,
and included podoplanin-expressing T cells within lymphoid aggregates. IL-27
inhibited the differentiation of podoplanin-expressing Th17 cells, and an
increased number of these cells were observed in IL-27R-deficient mice with
inflammatory arthritis. Thus, IL-27 appears to negatively regulate ELS
development in RA through control of effector T cells. These studies open new
opportunities for patient stratification and treatment.