NE cleaves and activates GSDMD.

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NE cleaves and activates GSDMD. NE cleaves and activates GSDMD. (A and B) Human neutrophils were treated with caspase inhibitors (Z-VAD-FMK, 20 μM; VX-765, 50 μM) before activation with PMA. NET formation was assessed by staining cells with SYTOX Green and measuring fluorescent signal over time. (C) GSDMD-expressing HEK293T lysates were incubated with lysates of human primary neutrophils for 20 min in the presence of absence of LDC7559 (10 μM) or NE inhibitor (NEi; 10 μM). (D to F) GSDMD-expressing HEK293T lysates were incubated with purified or recombinant proteases for 30 min. (E) Point mutations are indicated in green; caspase cleavage site D275 is marked in purple. Lysates were incubated with NE. (F) Expression of putative NE-cleaved N-terminal fragments of human GSDMD in HEK293T cells. LDH release was measured 16 hours after transfection. Mean ± SEM of three independent experiments is depicted. (G) Lysates of HEK293T cells expressing GSDMD with different four amino acid deletions were incubated with NE or caspase-4. The number on the lane of the Western corresponds to the number in the graphical depiction of the deletions at the bottom of the panel (caspase-4 site is marked in purple). FL, full-length GSDMD. (C to E and G) GSDMD was detected by Western blotting using an antibody directed against full-length GSDMD. Arrows indicate active fragment. *P < 0.05, **P < 0.01, ***P < 0.001, one-way ANOVA with Dunnett’s multiple comparisons test. Gabriel Sollberger et al. Sci. Immunol. 2018;3:eaar6689 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works