Restoration of endothelin-1-induced impairment in endothelium-dependent relaxation by interleukin-10 in murine aortic rings

Saiprasad M. Zemse, Rob H.P. Hilgers, G. Bryan Simkins, R. Daniel Rudic, R. Clinton Webb

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Endothelin-1 (ET-1) is implicated in the development of endothelial dysfunction through the generation of reactive oxygen species by NADPH oxidase activation. Interleukin-10 (IL-10) is an antiinflammatory cytokine that stimulates nitric oxide production, decreases superoxide production, and restores endothelial integrity after vascular injury. In this study, we tested whether IL-10 attenuates ET-1-induced endothelial dysfunction by improving acetylcholine (ACh)-induced relaxation of cultured murine aortic rings. Aortic rings (2 mm long) of C57BL/6 mice were incubated in 2 mL DMEM containing 120 U/mL penicillin and 120 μg/mL streptomycin in the presence of one of 4 treatments: vehicle (deionized water), ET-1 (100 nmol/L), recombinant mouse IL-10 (300 ng/mL), or a combination of both ET-1 and IL-10. After incubation at 37 °C for either 1 or 6 h (short-term exposure) or 22 h (overnight exposure), rings were mounted in a wire myograph and stretched to a passive force of 5 mN. Endothelium-dependent vasorelaxation was assessed by constructing cumulative concentration-response curves to ACh (0.001-10 μmol/L) during 10 μmol/L phenylephrine (PE)-induced contraction. Short-term exposure of ET-1 did not result in an impairment of ACh-induced relaxation. Overnight exposure of aortic rings to ET-1 resulted in a statistically significant endothelial dysfunction characterized by a reduced maximal relaxation response to ACh compared with that of untreated rings (Emax 57% ± 3% versus 82% ± 4%). IL-10 treatment restored ACh-induced relaxation (E max 77% ± 3%). Western blotting showed decreased eNOS expression in response to ET-1, whereas vessels treated with a combination of ET-1 and IL-10 showed increased expression of eNOS. Immunohistochemical analysis showed decreased eNOS expression in ET-1-treated vessels compared with those treated with both ET-1 and IL-10. We conclude that, in murine aorta, the antiinflammatory cytokine IL-10 prevents impairment in endothelium-dependent relaxation induced in response to long-term incubation with ET-1 via normalization of eNOS expression.

Original languageEnglish (US)
Pages (from-to)557-565
Number of pages9
JournalCanadian Journal of Physiology and Pharmacology
Volume86
Issue number8
DOIs
StatePublished - Aug 1 2008

Keywords

  • Endothelin-1
  • Endothelium
  • Interleukin-10
  • eNOS

ASJC Scopus subject areas

  • Physiology
  • Pharmacology
  • Physiology (medical)

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