NDLI: Discordance between microvascular permeability and leukocyte dynamics in septic inducible nitric oxide synthase deficient mice

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Discordance between microvascular permeability and leukocyte dynamics in septic inducible nitric oxide synthase deficient mice

Content Provider	Springer Nature : BioMed Central
Author	Hollenberg, Steven M Guglielmi, Massimiliano Parrillo, Joseph E
Abstract	Introduction Microvascular dysfunction causing intravascular leakage of fluid and protein contributes to hypotension and shock in sepsis. We tested the hypothesis that abrogation of inducible nitric oxide synthase (iNOS) activation would decrease leukocyte rolling, leukocyte adhesion, and microvascular leakage in sepsis. We compared wild-type mice made septic by cecal ligation and puncture with mice deficient in iNOS. Methods Leukocyte dynamics and microvascular permeability were assessed simultaneously by fluorescence intravital microscopy in the cremaster muscle 15 to 20 hours after induction of sepsis by cecal ligation and puncture in C57Bl/6 mice. Rolling and adhesion of leukocytes labeled with rhodamine and leakage of fluorescein isothiocyanate-conjugated albumin was measured in single nonbranching venules (25 to 40 μm) and compared among septic wild-type, septic iNOS-deficient transgenic, and sham-operated control mice. Results Leukocyte rolling and adhesion were increased in septic animals (61.6 ± 14.4 cells/minute and 4.1 ± 0.6 cells/100 μm per minute, respectively) as compared with control animals (8.5 ± 2.3 cells/minute and 1.1 ± 0.2 cells/100 μm per minute, respectively; P < 0.001 for both). Rolling increased in iNOS-deficient septic mice (to 105.5 ± 30.0 cells/minute, P = 0.048, versus wild-type septic); adhesion was unchanged (5.1 ± 0.5 cells/100 μm per minute, P = 0.30). Sepsis produced an increase in leakage ratio in wild-type septic mice compared with controls (0.36 ± 0.05 versus 0.08 ± 0.01, P < 0.001). Leakage was attenuated in iNOS-deficient septic mice (0.12 ± 0.02, P < 0.001, versus wild-type septic mice). Conclusion Leukocyte adhesion and vascular leakage were discordant in this setting. The finding that septic iNOS-deficient mice exhibited less microvascular leakage than wild-type septic mice despite equivalent increases in leukocyte adhesion suggests an important role for nitric oxide in modulating vascular permeability during sepsis.
Related Links	https://ccforum.biomedcentral.com/counter/pdf/10.1186/cc6190.pdf
Ending Page	7
Page Count	7
Starting Page	1
File Format	HTM / HTML
ISSN	13648535
DOI	10.1186/cc6190
Journal	Critical Care
Issue Number	6
Volume Number	11
Language	English
Publisher	BioMed Central
Publisher Date	2007-12-07
Access Restriction	Open
Subject Keyword	Intensive Critical Care Medicine Emergency Medicine Nitric Oxide Leukocyte Adhesion Vascular Leakage Cecal Ligation Leukocyte Rolling
Content Type	Text
Resource Type	Article
Subject	Critical Care and Intensive Care Medicine
Journal Impact Factor	8.8/2023
5-Year Journal Impact Factor	10.4/2023

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