Regulation of the beta-cell inflammasome and contribution to stress-induced cellular dysfunction and apoptosis

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Seyed Mojtaba Ghiasi, Mattias Salling Dahllöf, Yama Osmai, Mirwais Osmai, Kathrine Kronberg Jakobsen, Alexander Aivazidis, Björn Tyrberg, Lisa Perruzza, Michala Cecilie Burstein Prause, Dan Ploug Christensen, Morten Fog-Tonnesen, Morten Lundh, Fabio Grassi, Lucienne Chatenoud, Thomas Mandrup-Poulsen

β-Cells may be a source of IL-1β that is produced as inactive pro-IL-1β and processed into biologically-active IL-1β by enzymatic cleavage mediated by the NLRP1-, NLRP3- and NLRC4-inflammasomes. Little is known about the β-cell inflammasomes. NLRP1-expression was upregulated in islet-cells from T2D-patients and by IL-1β+IFNγ in INS-1 cells in a histone-deacetylase dependent manner. NLRP3 was downregulated by cytokines in INS-1 cells. NLRC4 was barely expressed and not regulated by cytokines. High extracellular K+ reduced cytokine-induced apoptosis and NO production and restored cytokine-inhibited accumulated insulin-secretion. Basal inflammasome expression was JNK1-3 dependent. Knock-down of the ASC interaction domain common for NLRP1 and 3 improved insulin secretion and ameliorated IL-1β and/or glucolipotoxicity-induced cell death and reduced cytokine-induced NO-production. Broad inflammasome-inhibition, but not NLRP3-selective inhibition, protected against IL-1β-induced INS-1 cell-toxicity. We suggest that IL-1β causes β-cell toxicity in part by NLRP1 mediated caspase-1-activation and maturation of IL-1β leading to an autocrine potentiation loop.

Original languageEnglish
JournalMolecular and Cellular Endocrinology
Volume478
Pages (from-to)106-114
ISSN0303-7207
DOIs
Publication statusPublished - 2018

ID: 201419580