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

Research output: Contribution to journalJournal articleResearchpeer-review

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

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
Pages (from-to)106-114
Publication statusPublished - 2018

ID: 201419580