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Angiopoietin-2 is increased in sepsis and inversely associated with nitric oxide-dependent microvascular reactivity

Davis, Joshua S., Yeo, Tsin W., Piera, Kim A., Woodberry, Tonia, Celermajer, David S., Stephens, Dianne P. and Anstey, Nicholas M. (2010). Angiopoietin-2 is increased in sepsis and inversely associated with nitric oxide-dependent microvascular reactivity. Critical Care,14(3):1-8.

Document type: Journal Article
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IRMA ID 81704288xPUB62
NHMRC Grant No. 290208
496600
Title Angiopoietin-2 is increased in sepsis and inversely associated with nitric oxide-dependent microvascular reactivity
Author Davis, Joshua S.
Yeo, Tsin W.
Piera, Kim A.
Woodberry, Tonia
Celermajer, David S.
Stephens, Dianne P.
Anstey, Nicholas M.
Journal Name Critical Care
Publication Date 2010
Volume Number 14
Issue Number 3
ISSN 1466-609X   (check CDU catalogue open catalogue search in new window)
Start Page 1
End Page 8
Total Pages 8
Place of Publication United Kingdom
Publisher BioMed Central Ltd.
HERDC Category C1 - Journal Article (DIISR)
Abstract Introduction
Angiopoietin-2 (ang-2), an angiogenic peptide released by endothelial cell Weibel-Palade bodies (WPBs), increases endothelial activation and vascular permeability. Ang-2 is raised in severe sepsis but the mechanisms underlying this are not known. Nitric oxide (NO) inhibits WPB exocytosis, and bioavailability of endothelial NO is decreased in sepsis. We hypothesized that endothelial NO bioavailability would be inversely correlated with ang-2 concentrations in sepsis.

Methods
Plasma ang-2, vascular endothelial growth factor (VEGF) and endothelial-active cytokines were assessed in 83 patients with early sepsis and 41 hospital controls, and related to reactive hyperaemia-peripheral arterial tonometry, RH-PAT, a measure of endothelial NO bioavailability.

Results
Plasma Ang-2 was elevated in sepsis (median [interquartile range (IQR)], ng/ml: severe sepsis 12.4 [8.5-33.4], sepsis without organ failure 6.1 [5.0-10.4], controls 2.7 [2.2-3.6], P < 0.0001). It correlated inversely with RH-PAT (r = -0.38, P < 0.0001) and positively with IL-6 (r = 0.57, P < 0.0001) and degree of organ failure (sequential organ function assessment score) (r = 0.58, P < 0.0001). The correlation of ang-2 with RH-PAT persisted after controlling for sepsis severity. In a longitudinal mixed-effects model, recovery of RH-PAT over time was associated with decline in ang-2.

Conclusions
Ang-2 is elevated in proportion to sepsis severity, and inversely correlated with NO-dependent microvascular reactivity. Impaired endothelial NO bioavailability may contribute to increased endothelial cell release of ang-2, endothelial activation and capillary leak. Agents that increase endothelial NO bioavailability or inhibit WPB exocytosis and/or Ang-2 activity may have therapeutic potential in sepsis.

DOI http://dx.doi.org/10.1186/cc9020   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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