Published ahead of print on January 25, 2007, doi:10.1164/rccm.200610-1436CP Am. J. Respir. Crit. Care Med., Volume 175, Number 8, April 2007, 763-767 A more recent version of this article appeared on April 15, 2007
Submitted on October 8, 2006 Gene Silencing in Severe Systemic InflammationCharles E McCall1* and Barbara K Yoza21 Sections of Molecular Medicine and Infectious Diseases, Department of Internal Medicine, Wake Forest University School of Medicine, Winston Salem, NC, USA, 2 Sections of Molecular Medicine and Infectious Diseases, Department of Internal Medicine, Wake Forest University School of Medicine, Winston Salem, NC, USA; Department of General Surgery, Division of Surgical Sciences, Wake Forest University School of Medicine, Winston Salem, NC, USA * To whom correspondence should be addressed. E-mail: chmccall{at}wfubmc.edu.
This critical care perspective appraises reprogramming of gene expression in inflammatory diseases as an emerging concept of clinical importance. We emphasize gene reprogramming that 'silences' acute proinflammatory genes during severe systemic inflammation, wherein in the systemic inflammatory response syndrome (SIRS) exists as a continuum during severe sepsis, septic shock and the multiorgan dysfunction and failure phenotypes without infection In contrast, silencing of acute proinflammatory genes is not apparent in sites of localized inflammatory processes like rheumatoid arthritis. We discuss in three parts the clinical context and the translational basic science associated with gene silencing during the SIRS continuum of severe systemic inflammation: 1) reprogramming of acute proinflammatory genes; 2) an 'NF-BB paradox', coupled with RelB expression that combine to silence genes using an epigenetic (inherited and reversible) signature on the nucleosome; and 3) the potential clinical importance of compartmentalization in gene silencing. Our emergent understanding of these physiological processes may provide a novel framework developing treatments. Key words: SIRS, NF kappa B, Transcription factor RelB, Nucleosomes, Respiratory Distress Syndrome, Adult, Inflammation
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