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Article

High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway

  • Authors:
    • Xiu-Juan Liu
    • Zhi-Dan Zhang
    • Xiao-Chun Ma
  • View Affiliations / Copyright

    Affiliations: Department of Intensive Care Unit, The First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
  • Pages: 361-367
    |
    Published online on: June 18, 2013
       https://doi.org/10.3892/etm.2013.1166
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Abstract

Chronic hyperglycemia is an established risk factor for endothelial damage. It remains unclear, however, whether brief hyperglycemic exposure exacerbates the damage to vascular endothelial cells induced by endotoxin. We hypothesize that brief hyperglycemic exposure enhances the permeability of the endothelium following stimulation with lipopolysaccharide (LPS). Correlations between modulation of nitric oxide synthase (NOS) pathways and altered endothelial homeostasis have been studied and demonstrated in various pathophysiological conditions. NOS activities are regulated by endogenous inhibitors, including asymmetric dimethylarginine (ADMA), which is metabolized by dimethylarginine dimethylaminohydrolase (DDAH). Since previous data demonstrated that endothelial dysfunction may be related to reduced expression and/or activity of DDAH, in this study, we aimed to determine the effect of increased glucose levels on pulmonary microvascular endothelial cell (PMVEC) permeability, including effects on the NOS pathways. Human PMVECs were incubated with normal (5.5 mM) and high (33 mM) concentrations of D-glucose for 5 days to create a monolayer of cells prior to LPS stimulation (10 µg/ml) for 12 h. When stimulated with LPS, cells incubated with a high glucose (HG) concentration had significant microfilament rearrangement compared with cells incubated with a normal glucose concentration, as determined by immunofluorescence. Scanning electron microscopy revealed a larger average diameter and increased number of fenestrae on the hyperglycemic PMVECs when stimulated with LPS, compared with PMVECs cultured with a normal glucose concentration. The results demonstrated that a high concentration of glucose increases the LPS-stimulated horseradish peroxidase (HRP) permeability compared with a normal concentration of glucose. Furthermore, a HG concentration upregulated LPS-stimulated inducible NOS (iNOS) production and downregulated endothelial NOS (eNOS) and DDAH-2 expression. Hyperglycemia significantly increased LPS-stimulated nitrite/nitrate production (stable NO end‑products). Our results, thus, demonstrate that in vitro HG concentrations exacerbate LPS-stimulated cytoskeletal rearrangement and hyperpermeability of an endothelial monolayer, and cause further imbalance of the NO pathway. These results suggest that it is important to manage even short-term increases in blood glucose, particularly following acute infection.
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Copy and paste a formatted citation
Spandidos Publications style
Liu X, Zhang Z and Ma X: High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway. Exp Ther Med 6: 361-367, 2013.
APA
Liu, X., Zhang, Z., & Ma, X. (2013). High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway. Experimental and Therapeutic Medicine, 6, 361-367. https://doi.org/10.3892/etm.2013.1166
MLA
Liu, X., Zhang, Z., Ma, X."High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway". Experimental and Therapeutic Medicine 6.2 (2013): 361-367.
Chicago
Liu, X., Zhang, Z., Ma, X."High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway". Experimental and Therapeutic Medicine 6, no. 2 (2013): 361-367. https://doi.org/10.3892/etm.2013.1166
Copy and paste a formatted citation
x
Spandidos Publications style
Liu X, Zhang Z and Ma X: High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway. Exp Ther Med 6: 361-367, 2013.
APA
Liu, X., Zhang, Z., & Ma, X. (2013). High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway. Experimental and Therapeutic Medicine, 6, 361-367. https://doi.org/10.3892/etm.2013.1166
MLA
Liu, X., Zhang, Z., Ma, X."High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway". Experimental and Therapeutic Medicine 6.2 (2013): 361-367.
Chicago
Liu, X., Zhang, Z., Ma, X."High glucose enhances LPS-stimulated human PMVEC hyperpermeability via the NO pathway". Experimental and Therapeutic Medicine 6, no. 2 (2013): 361-367. https://doi.org/10.3892/etm.2013.1166
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