Journal Article

Endothelial Dysfunction in Normal and Prediabetic Rats With Metabolic Syndrome Exposed by Oral Gavage to Carbon Black Nanoparticles

Janne Kjærsgaard Folkmann, Lise Kristine Vesterdal, Majid Sheykhzade, Steffen Loft and Peter Møller

in Toxicological Sciences

Volume 129, issue 1, pages 98-107
Published in print September 2012 | ISSN: 1096-6080
Published online May 2012 | e-ISSN: 1096-0929 | DOI: http://dx.doi.org/10.1093/toxsci/kfs180
Endothelial Dysfunction in Normal and Prediabetic Rats With Metabolic Syndrome Exposed by Oral Gavage to Carbon Black Nanoparticles

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Exposure to nanosized particles may increase the risk of cardiovascular diseases by endothelial dysfunction, particularly in susceptible subjects with metabolic syndrome. We investigated vasomotor dysfunction in aorta from obese and lean Zucker rats after oral exposure to nanosized carbon black (CB). Rats were exposed to 1 or 10 weekly doses of 0, 0.064, 0.64 or 6.4mg/kg bodyweight and sacrificed 24h or 13 weeks later. The exposure to 10 doses of 0.064 or 0.64mg/kg reduced the acetylcholine-induced vasorelaxation in the lean and obese rats. The half maximal effect concentration values increased by twofold (95% CI: 1.1–3.5-fold) and fourfold (95% CI: 2.3–6.9-fold) in the rats exposed to 0.064 and 0.64mg/kg compared with the controls, respectively. The rats exposed to 10 doses of 0.64mg/kg had also 20% (95% CI: 10–29%) lower maximal effect value compared with the controls. However, the nitroglycerin-induced vasorelaxation and phenylephrine-induced vasocontraction was not affected in rats exposed to CB. The endothelial dysfunction was not observed in rats sacrificed 13 weeks after the last CB exposure. There was unaltered expression of Chrm3, Nos3, Nos2, Ccl2, and Hmox1 in aorta tissue of CB-exposed rats. In conclusion, repeated oral exposure to CB was associated with endothelial dysfunction in rats, further aggravating the effect of metabolic syndrome.

Keywords: cardiovascular disease; cholesterol; gastrointestinal tract; glucose; insulin; nanoparticles; particulate matter; triglycerides; Zucker rats

Journal Article.  7213 words.  Illustrated.

Subjects: Medical Toxicology ; Toxicology (Non-medical)

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