Nuclear import of proinflammatory transcription factors is required for massive liver apoptosis induced by bacterial lipopolysaccharide.

The Journal of Biological Chemistry
Danya LiuJacek Hawiger

Abstract

Stimulation of macrophages with lipopolysaccharide (LPS) leads to the production of cytokines that elicit massive liver apoptosis. We investigated the in vivo role of stress-responsive transcription factors (SRTFs) in this process focusing on the precipitating events that are sensitive to a cell-permeant peptide inhibitor of SRTF nuclear import (cSN50). In the absence of cSN50, mice challenged with LPS displayed very early bursts of inflammatory cytokines/chemokines, tumor necrosis factor alpha (1 h), interleukin 6 (2 h), interleukin 1 beta (2 h), and monocyte chemoattractant protein 1 (2 h). Activation of both initiator caspases 8 and 9 and effector caspase 3 was noted 4 h later when full-blown DNA fragmentation and chromatin condensation were first observed (6 h). At this time an increase of pro-apoptotic Bax gene expression was observed. It was preceded by a decrease of anti-apoptotic Bcl2 and BclX(L) gene transcripts. Massive apoptosis was accompanied by microvascular injury manifested by hemorrhagic necrosis and a precipitous drop in blood platelets observed at 6 h. An increase in fibrinogen/fibrin degradation products and a rise in plasminogen activator inhibitor 1 occurred between 4 and 6 h. Inhibition of SRTFs nuclear i...Continue Reading

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