Cutting edge: Endoplasmic reticulum stress licenses macrophages to produce mature IL-1β in response to TLR4 stimulation through a caspase-8- and TRIF-dependent pathway.

ABSTRACT: The accumulation of improperly folded proteins within the endoplasmic reticulum (ER) generates perturbations known as ER stress that engage the unfolded protein response. ER stress is involved in many inflammatory pathologies that are also associated with the production of the proinflammatory cytokine IL-1β. In this study, we demonstrate that macrophages undergoing ER stress are able to drive the production and processing of pro-IL-1β in response to LPS stimulation in vitro. Interestingly, the classical NLRP3 inflammasome is dispensable, because maturation of pro-IL-1β occurs normally in the absence of the adaptor protein ASC. In contrast, processing of pro-IL-1β is fully dependent on caspase-8. Intriguingly, we found that neither the unfolded protein response transcription factors XBP1 an

SUBMITTER: Shenderov K 

PROVIDER: S-EPMC3935725 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature