Pivotal role of Cu,Zn-superoxide dismutase in endothelium-dependent hyperpolarization

Keiko Morikawa, Hiroaki Shimokawa, Tetsuya Matoba, Hiroshi Kubota, Takaaki Akaike, M. A.Hassan Talukder, Makoto Hatanaka, Takako Fujiki, Hiroshi Maeda, Shosuke Takahashi, Akira Takeshita

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Abstract

The endothelium plays an important role in maintaining vascular homeostasis by synthesizing and releasing several vasodilating factors, including prostacyclin, NO, and endothelium-derived hyperpolarizing factor (EDHF). We have recently identified that endothelium-derived H2O 2 is an EDHF in mesenteric arteries of mice and humans and in porcine coronary microvessels. However, the mechanism for the endothelial production of H2O2 as an EDHF remains to be elucidated. In this study, we tested our hypothesis that Cu,Zn-superoxide dismutase (Cu,Zn-SOD) plays a pivotal role in endothelium-dependent hyperpolarization, using control and Cu,Zn-SOD-/- mice. In mesenteric arteries, EDHF-mediated relaxations and hyperpolarizations were significantly reduced in Cu,Zn-SOD-/- mice with no inhibitory effect of catalase, while endothelium-independent relaxations and hyperpolarizations were preserved. Endothelial H2O2 production also was significantly reduced in Cu,Zn-SOD-/- mice. In Langendorff isolated heart, bradykinin-induced increase in coronary flow was significantly reduced in Cu,Zn-SOD-/- mice, again with no inhibitory effect of catalase. The exogenous SOD mimetic tempol significantly improved EDHF-mediated relaxations and hyperpolarizations and coronary flow response in Cu,Zn-SOD-/- mice. These results prove the novel concept that endothelial Cu,Zn-SOD plays an important role as an "EDHF synthase" in mice, in addition to its classical role to scavenge superoxide anions.

Original languageEnglish
Pages (from-to)1871-1879
Number of pages9
JournalJournal of Clinical Investigation
Volume112
Issue number12
DOIs
Publication statusPublished - 2003 Dec 1

ASJC Scopus subject areas

  • Medicine(all)

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    Morikawa, K., Shimokawa, H., Matoba, T., Kubota, H., Akaike, T., Talukder, M. A. H., Hatanaka, M., Fujiki, T., Maeda, H., Takahashi, S., & Takeshita, A. (2003). Pivotal role of Cu,Zn-superoxide dismutase in endothelium-dependent hyperpolarization. Journal of Clinical Investigation, 112(12), 1871-1879. https://doi.org/10.1172/JCI200319351