Mechanisms of polymicrobial sepsis-induced ileus

American Journal of Physiology. Gastrointestinal and Liver Physiology
Marcus OverhausAnthony J Bauer

Abstract

Sepsis frequently occurs after hemorrhage, trauma, burn, or abdominal surgery and is a leading cause of morbidity and mortality in severely ill patients. We performed experiments to delineate intestinal molecular and functional motility consequences of polymicrobial sepsis in the clinically relevant cecal ligation and puncture (CLP) sepsis model. CLP was performed on male Sprague-Dawley rats. Gastrointestinal transit, colonic in vivo pressure recordings, and in vitro muscle contractions were recorded. Histochemistry was performed for macrophages, monocytes, and neutrophils. Inflammatory gene expressions were quantified by real-time RT-PCR. CLP delayed gastrointestinal transit, decreased colonic pressures, and suppressed in vivo circular muscle contractility of the jejunum and colon over a 4-day period. A leukocytic infiltrate of monocytes and neutrophils developed over 24 h. Real-time RT-PCR demonstrated a significant temporal elevation in IL-6, IL-1beta, monocyte chemoattractant protein-1, and inducible nitric oxide synthase, with higher expression levels of IL-6 and inducible nitric oxide synthase in colonic extracts compared with small intestine. Polymicrobial CLP sepsis induces a complex inflammatory response within the int...Continue Reading

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