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Published on: December 21, 2011
IL-10 deficiency increases superoxide and endothelial dysfunction during inflammation
C A Gunnett1, D D Heistad, D J Berg
1Department of Internal Medicine and Department of Pharmacology, Cardiovascular Center, University of Iowa College of Medicine, Iowa City, Iowa 52242-1081, USA.
American Journal of Physiology. Heart and Circulatory Physiology
|September 29, 2000
Summary
Interleukin-10 (IL-10) protects blood vessel function during inflammation. In IL-10 deficient mice, lipopolysaccharide (LPS) impaired artery relaxation, which was linked to increased superoxide levels.
Area of Science:
- Vascular Biology
- Immunology
- Inflammation Research
Background:
- Interleukin-10 (IL-10) is an anti-inflammatory cytokine with a poorly understood role in vascular health.
- Endothelial dysfunction is a hallmark of inflammatory conditions, contributing to cardiovascular disease.
- Lipopolysaccharide (LPS) is a potent endotoxin that triggers inflammatory responses.
Purpose of the Study:
- To investigate the protective role of IL-10 in maintaining endothelial function following lipopolysaccharide (LPS) exposure.
- To determine if IL-10 deficiency exacerbates LPS-induced endothelial dysfunction.
- To explore the involvement of reactive oxygen species, specifically superoxide, in LPS-induced endothelial impairment in the absence of IL-10.
Main Methods:
- Utilized IL-10-deficient (IL-10 -/-) and wild-type (IL-10 +/+) mice.
- Administered a low dose of LPS to mice and subsequently studied carotid artery responses in vitro.
- Assessed endothelium-dependent relaxation using acetylcholine (ACh) and endothelium-independent relaxation using nitroprusside and papaverine.
- Quantified superoxide levels in carotid arteries using confocal microscopy and hydroethidine.
- Investigated the effects of superoxide dismutase and allopurinol on impaired vascular function.
Main Results:
- LPS treatment significantly impaired endothelium-dependent relaxation in carotid arteries of IL-10 -/- mice, but not in wild-type mice.
- Superoxide levels were elevated in carotid arteries of LPS-treated IL-10 -/- mice compared to controls.
- Administration of superoxide dismutase or allopurinol restored normal vascular relaxation in LPS-treated IL-10 -/- mice.
- Endothelium-independent relaxation remained unaffected by LPS in either genotype.
Conclusions:
- IL-10 plays a critical protective role in preserving endothelial function during acute inflammatory stimuli like LPS.
- LPS-induced endothelial dysfunction in IL-10 deficient mice is mediated by increased superoxide production.
- Xanthine oxidase may be a significant source of superoxide contributing to vascular impairment in this inflammatory model.
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