Reactive oxygen and nitrogen species in sepsis-induced hepatic microvascular dysfunction
- Georg SingerAffiliated withDepartment of Pediatric Surgery, Medical University of Graz Email author
- , Karen Y. StokesAffiliated withDepartment of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center
- , D. Neil GrangerAffiliated withDepartment of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center Email author
Objective and design
Hepatic microvascular dysfunction is a critical event in the development of liver failure during sepsis. Activated blood cells and reactive oxygen and nitrogen species (RONS) have been implicated in the pathogenesis of sepsis.
Intravital-videomicroscopy was used to determine whether RONS contribute to the recruitment of leukocytes/platelets in the hepatic microvasculature during sepsis. Six hours following cecal-ligation and puncture (CLP), disturbances of the hepatic microvasculature were assessed in WT-mice (C57Bl/6 J; n = 8), in mice lacking gp91phox(n = 5), overexpressing superoxide-dismutase (SOD, n = 8), in WT-mice treated with a NOS-inhibitor (l-NAME, n = 5), lacking nNOS, eNOS or iNOS (n = 5 each), treated with the NO-donor DetaNO (n = 5), in WT-mice treated with gadolinium-chloride (GdCl2, n = 5) and compared to a group of WT-mice following a sham operation (n = 8). Six hours post-CLP, the adhesion of leukocytes and platelets in terminal hepatic venules (THV) and sinusoids was quantified.
In WT-mice, CLP elicited increases in the number of adherent leukocytes and platelets. Similar responses to CLP were noted in mice overexpressing SOD or lacking either eNOS or gp91phox. The blood-cell recruitment was significantly blunted in septic iNOS-knockout mice and this response was reversed by pre-treatment with DetaNO.
These findings suggest that iNOS-derived NO is a determinant of the pro-inflammatory phenotype assumed by the hepatic microvasculature during sepsis.
KeywordsNitric oxide NADPH oxidase iNOS eNOS nNOS SOD
- Reactive oxygen and nitrogen species in sepsis-induced hepatic microvascular dysfunction
- Open Access
- Available under Open Access This content is freely available online to anyone, anywhere at any time.
Volume 62, Issue 2 , pp 155-164
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- SP Birkhäuser Verlag Basel
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- Nitric oxide
- NADPH oxidase
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- Author Affiliations
- 1. Department of Pediatric Surgery, Medical University of Graz, Graz, Austria
- 2. Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA, 71130-3932, USA