4.7 Article

GRASP55 and UPR Control Interleukin-1β Aggregation and Secretion

Journal

DEVELOPMENTAL CELL
Volume 49, Issue 1, Pages 145-+

Publisher

CELL PRESS
DOI: 10.1016/j.devcel.2019.02.011

Keywords

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Funding

  1. Spanish Ministry of Economy and Competitiveness [BFU2013-44188-P, BFU2016_75372-P]
  2. Spanish Ministry of Economy and Competitiveness, through the Programmes Centro de Excelencia Severo Ochoa 2013-2017'' [SEV-2012-0208, SEV-2013-0347]

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Signal-sequence-lacking interleukin (IL)-1 beta, is cleaved by caspase-1 to mature mIL-1 beta, which is secreted, without entering the endoplasmic reticulum. We report that macrophages of GRASP55(-/-) mice are defective in mIL-1 beta secretion and retain it as intracellular aggregates. Intriguingly, GRASP55(-/-) macrophages are defective in the IRE1 alpha branch of the unfolded protein response. This finding fits well with our data that inhibition of IRE1 alpha also impairs mIL-1 beta secretion and causes its accumulation in intracellular aggregates. PERK inhibition, on the other hand, controls caspase-1-mediated conversion of proIL-1 beta to mIL-1 beta. These findings reveal translation-independent functions of PERK and IRE1 alpha: PERK controls the production of mIL-1 beta, which is then followed by GRASP55 and IRE1 alpha activity to keep mIL-1 beta in a secretion-competent form.

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