Pyrin Inflammasome Activation Abrogates Interleukin-1 Receptor Antagonist, Suggesting a New Mechanism Underlying Familial Mediterranean Fever Pathogenesis

Sussi B Mortensen, Ann-Brit E Hansen, Trine H Mogensen, Marianne A Jakobsen, Hans C Beck, Eva B Harvald, Kate L Lambertsen, Isik S Johansen, Ditte C Andersen

Abstrakt

OBJECTIVE: Aberrant pyrin inflammasome activity triggers familial Mediterranean fever (FMF) pathogenesis, but the exact mechanism remains elusive and an obstacle to efficient treatment. We undertook this study to identify pyrin inflammasome-specific mechanisms to improve FMF treatment and diagnostics in the future.

METHODS: Pyrin-specific protein secretion was assessed by proteome analysis in U937-derived macrophages, and specific findings were confirmed in pyrin inflammasome-activated monocytes from healthy blood donors and patients with FMF, stratified according to MEFV genotype categories corresponding to a suspected increase in FMF disease severity.

RESULTS: Proteome data revealed a differential secretion pattern of interleukin-1 receptor antagonist (IL-1Ra) from pyrin- and NLRP3-activated U937-derived macrophages, which was verified by enzyme-linked immunosorbent assay and quantitative polymerase chain reaction. Moreover, pyrin activation significantly reduced IL1RN messenger RNA expression (P < 0.001) and IL-1Ra secretion (P < 0.01) in healthy donor and FMF monocytes, respectively. Independent of MEFV genotype, unstimulated FMF monocytes from colchicine-treated patients secreted lower amounts of IL-1Ra compared to healthy donors (P < 0.05) and displayed decreased ratios of IL-1Ra:IL-1β (P < 0.05), suggesting a reduced antiinflammatory capacity.

CONCLUSION: Our data show an inherent lack of IL-1Ra expression specific to pyrin inflammasome activation, suggesting a new mechanism underlying FMF pathogenesis. The reduced IL-1Ra levels in FMF monocytes suggest a diminished antiinflammatory capacity that potentially leaves FMF patients sensitive to proinflammatory stimuli, regardless of receiving colchicine therapy. Thus, considering the potential clinical consequence of reduced monocyte IL-1Ra secretion in FMF patients, we suggest further investigation into IL-1Ra dynamics and its potential implications for FMF treatment in the future.

OriginalsprogEngelsk
Artikelnummer41770
TidsskriftArthritis and Rheumatology
Vol/bind73
Udgave nummer11
Sider (fra-til)2116-2126
Antal sider11
ISSN2326-5191
DOI
StatusUdgivet - nov. 2021

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