Endothelial dysfunction is a potential contributor to multiple organ failure and mortality in aged mice subjected to septic shock

Preclinical studies in a murine model of cecal ligation and puncture

Ciro Coletta, Katalin Modis, Gábor Oláh, Attila Brunyánszki, Daniela S. Herzig, Edward R. Sherwood, Zoltán Ungvári, Csaba Szabo

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Abstract

Introduction: The goal of the current study was to investigate the effect of aging on the development of endothelial dysfunction in a murine model of sepsis, and to compare it with the effect of genetic deficiency of the endothelial isoform of nitric oxide synthase (eNOS).Methods: Cecal ligation and puncture (CLP) was used to induce sepsis in mice. Survival rates were monitored and plasma indices of organ function were measured. Ex vivo studies included the measurement of vascular function in thoracic aortic rings, assessment of oxidative stress/cellular injury in various organs and the measurement of mitochondrial function in isolated liver mitochondria.Results: eNOS deficiency and aging both exacerbated the mortality of sepsis. Both eNOS-deficient and aged mice exhibited a higher degree of sepsis-associated multiple organ dysfunction syndrome (MODS), infiltration of tissues with mononuclear cells and oxidative stress. A high degree of sepsis-induced vascular oxidative damage and endothelial dysfunction (evidenced by functional assays and multiple plasma markers of endothelial dysfunction) was detected in aortae isolated from both eNOS-/- and aged mice. There was a significant worsening of sepsis-induced mitochondrial dysfunction, both in eNOS-deficient mice and in aged mice. Comparison of the surviving and non-surviving groups of animals indicated that the severity of endothelial dysfunction may be a predictor of mortality of mice subjected to CLP-induced sepsis.Conclusions: Based on the studies in eNOS mice, we conclude that the lack of endothelial nitric oxide production, on its own, may be sufficient to markedly exacerbate the severity of septic shock. Aging markedly worsens the degree of endothelial dysfunction in sepsis, yielding a significant worsening of the overall outcome. Thus, endothelial dysfunction may constitute an early predictor and independent contributor to sepsis-associated MODS and mortality in aged mice.

Original languageEnglish (US)
Article number511
Pages (from-to)1-15
Number of pages15
JournalCritical Care
Volume18
Issue number5
DOIs
StatePublished - Sep 16 2014

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Multiple Organ Failure
Septic Shock
Punctures
Ligation
Sepsis
Nitric Oxide Synthase Type III
Mortality
Protein Isoforms
Blood Vessels
Oxidative Stress
Liver Mitochondrion
Aorta
Nitric Oxide
Thorax
Survival Rate
Wounds and Injuries

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine

Cite this

Endothelial dysfunction is a potential contributor to multiple organ failure and mortality in aged mice subjected to septic shock : Preclinical studies in a murine model of cecal ligation and puncture. / Coletta, Ciro; Modis, Katalin; Oláh, Gábor; Brunyánszki, Attila; Herzig, Daniela S.; Sherwood, Edward R.; Ungvári, Zoltán; Szabo, Csaba.

In: Critical Care, Vol. 18, No. 5, 511, 16.09.2014, p. 1-15.

Research output: Contribution to journalArticle

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AU - Modis, Katalin

AU - Oláh, Gábor

AU - Brunyánszki, Attila

AU - Herzig, Daniela S.

AU - Sherwood, Edward R.

AU - Ungvári, Zoltán

AU - Szabo, Csaba

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N2 - Introduction: The goal of the current study was to investigate the effect of aging on the development of endothelial dysfunction in a murine model of sepsis, and to compare it with the effect of genetic deficiency of the endothelial isoform of nitric oxide synthase (eNOS).Methods: Cecal ligation and puncture (CLP) was used to induce sepsis in mice. Survival rates were monitored and plasma indices of organ function were measured. Ex vivo studies included the measurement of vascular function in thoracic aortic rings, assessment of oxidative stress/cellular injury in various organs and the measurement of mitochondrial function in isolated liver mitochondria.Results: eNOS deficiency and aging both exacerbated the mortality of sepsis. Both eNOS-deficient and aged mice exhibited a higher degree of sepsis-associated multiple organ dysfunction syndrome (MODS), infiltration of tissues with mononuclear cells and oxidative stress. A high degree of sepsis-induced vascular oxidative damage and endothelial dysfunction (evidenced by functional assays and multiple plasma markers of endothelial dysfunction) was detected in aortae isolated from both eNOS-/- and aged mice. There was a significant worsening of sepsis-induced mitochondrial dysfunction, both in eNOS-deficient mice and in aged mice. Comparison of the surviving and non-surviving groups of animals indicated that the severity of endothelial dysfunction may be a predictor of mortality of mice subjected to CLP-induced sepsis.Conclusions: Based on the studies in eNOS mice, we conclude that the lack of endothelial nitric oxide production, on its own, may be sufficient to markedly exacerbate the severity of septic shock. Aging markedly worsens the degree of endothelial dysfunction in sepsis, yielding a significant worsening of the overall outcome. Thus, endothelial dysfunction may constitute an early predictor and independent contributor to sepsis-associated MODS and mortality in aged mice.

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