Hypertonic saccharide solution delays pyroptosis in murine macrophages regardless of the membrane binding of gasdermin D N-terminal.

Affiliation

Zheng J(1)(2), Wang D(3), Chen Q(3), Liu Q(3), Lin Z(3), Hu Q(1)(2), Wu X(1)(2), Gao X(3), Li Q(1), Ren J(1)(2).
Author information:
(1)Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, China.
(2)Lab for Trauma and Surgical Infections, Jinling Hospital, Medical School of Nanjing University, Nanjing, China.
(3)State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China.

Abstract

Pyroptosis is a type of programmed lytic cell death that could be activated by either the canonical or noncanonical inflammasome pathway. In this study, we aimed to examine the effect of hypertonic solution on noncanonical pyroptosis in macrophage. We found that although hypertonic solution had a general inhibitory effect on noncanonical pyroptosis, the underlying mechanism varied by the solute causing hypertonicity. Specifically, hypertonic NaCl or KCl solution inhibited the cleavage of gasdermin D, the pore-forming protein in pyroptosis, whereas hypertonic saccharide solution did not affect the cleavage or membrane binding of gasdermin D. In this case, nevertheless, pyroptosis was still inhibited as evidenced by the preserved mitochondria activity and cell membrane permeability.