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Erschienen in: Inflammation Research 10/2014

01.10.2014 | Original Research Paper

NLRP3 inflammasome activation and interleukin-1β release in macrophages require calcium but are independent of calcium-activated NADPH oxidases

verfasst von: Balázs Rada, Jonathan J. Park, Payel Sil, Miklós Geiszt, Thomas L. Leto

Erschienen in: Inflammation Research | Ausgabe 10/2014

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Abstract

Objective and design

We studied the involvement of calcium and calcium-activated NADPH oxidases in NLRP3 inflammasome activation and IL-1β release to better understand inflammasome signaling in macrophages.

Material or subjects

Human volunteer blood donors were recruited to isolate monocytes to differentiate them into macrophages. Wild-type or DUOX1-deficient C57/B6 mice were used to prepare bone marrow-derived macrophages.

Treatment

Murine or human macrophages were treated in vitro with NLRP3 inflammasome agonists (ATP, silica crystals) or calcium agonists (thapsigargin, ionomycin) in calcium-containing or calcium-free medium.

Methods

Intracellular calcium changes were followed by measuring FURA2-based fluorescence. Gene expression changes were measured by quantitative real-time PCR. Protein expression was assessed by western blotting. Enzymatic activity was measured by fluorescence caspase-1 activity assay. IL-1β release was determined by ELISA. ELISA data were analyzed by ANOVA and Tukey’s post hoc test.

Results

Our data show that calcium is essential for IL-1β release in human macrophages. Increases in cytosolic calcium alone lead to IL-1β secretion. Calcium removal blocks caspase-1 activation. Human macrophages express Duox1, a calcium-regulated NADPH oxidase that produces reactive oxygen species. However, Duox1-deficient murine macrophages show normal IL-1β release.

Conclusions

Human macrophage inflammasome activation and IL-1β secretion requires calcium but does not involve NADPH oxidases.
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Metadaten
Titel
NLRP3 inflammasome activation and interleukin-1β release in macrophages require calcium but are independent of calcium-activated NADPH oxidases
verfasst von
Balázs Rada
Jonathan J. Park
Payel Sil
Miklós Geiszt
Thomas L. Leto
Publikationsdatum
01.10.2014
Verlag
Springer Basel
Erschienen in
Inflammation Research / Ausgabe 10/2014
Print ISSN: 1023-3830
Elektronische ISSN: 1420-908X
DOI
https://doi.org/10.1007/s00011-014-0756-y

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