GSDMD localizes to the plasma membrane and is processed during NET formation. GSDMD localizes to the plasma membrane and is processed during NET formation.

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GSDMD localizes to the plasma membrane and is processed during NET formation. GSDMD localizes to the plasma membrane and is processed during NET formation. (A) Western blot of human primary neutrophils isolated from a control donor (ctr.) or from a patient with X-linked CGD after stimulation with PMA for 2.5 hours. GSDMD was detected with an antibody directed against full-length GSDMD. In this control, donor loss of full-length GSDMD corresponded with the occurrence of a processed N terminus, which is marked by an arrow. (B) Microscopy images of human primary neutrophils activated for the indicated time points with PMA and stained with antibodies against GSDMD and NE as well as with the DNA dye DAPI; membranes were stained with DiI. GSDMD is detected in remnants of cells that had made a NET (white arrows). Images were acquired at the coverslip level; therefore, spread NETs are not seen. Scale bars, 10 μm. (C) High-resolution TIRF microscopy of human primary neutrophils undergoing NET formation. Cells were fixed at the indicated time points after PMA stimulation in the presence or absence of 5 μM LDC7559. Plasma membranes were stained with DiD. Scale bars, 10 μm. (D) Quantification of TIRF microscopy. Background signal was determined outside the cells, and GSDMD signal (at least 2× background fluorescence intensity) in the TIRF zone was analyzed. Mean ± SEM of three independent experiments is depicted. ***P < 0.001, unpaired two-tailed t 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